Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  562 - U.S. Route 29 Water Transmission Main

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Microtunneling Columbia, MD Howard County DPW Soft Ground, Mixed Face 469' x 60"Ø
SUMMARY: Bradshaw recently completed the installation of 470 linear feet of 60 inch steel casing under U.S. Route 29 for a 36 inch water transmission main. Tunnel depths ranged from 6 to 30 feet below the surface, with the alignment passing beneath the water table through dense silty sands and partially weathered rock. Bradshaw constructed a 32 foot diameter, 27 foot deep steel rib-and-liner plate launch... Complete Project Profile

  560 - Terris Tatum Tennessee River Intake Facilities

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Microtunneling Slurry Triana, AL Madison Utilities Mixed Face 388' x 60"Ø
SUMMARY: Bradshaw construction completed a microtunneling installation of lined 60” steel casing with three (3) 6” HDPE airlines installed within the casing. The casing served as a water intake on the Tennessee River in Madison, Alabama. The MTBM was recovered underwater by the use of divers and was a true test in itself. The major challenge on the project was fighting the buoyant forces of the... Complete Project Profile

  554 - MD RT 301 24" Force Main

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Microtunneling Slurry Waldorf, MD St. Charles Companies Soft Ground 355' x 43"Ø
SUMMARY: Bradshaw Construction Corp. completed the installation of 355 linear feet of 43 inch steel casing and 24 inch ductile iron pipe under Smallwood Road as part of Charles County’s US 301 Force Main Project. A 30 foot by 16 foot steel sheeted shaft was constructed for the launch at 15 vertical feet deep. The casing was jacked behind a microtunnel boring machine in silty sand and clay. Complete Project Profile

  553 - West End Trunk Line Microtunnel Project

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Microtunneling Slurry Coatesville, PA PAW Rock 1017' x 59" Ø
SUMMARY: To increase capacity and replace an aging sewer pipeline through the Arclermittal Steel facility in Coatesville, PA, Pennsylvania American Water needed to construct a new 30" gravity sewer that would not pass down the plant's main thoroughfare. Bradshaw Construction was contracted to build the trenchless portion this new line parallel to Valley Road. The 1,017' long tunnel was constructed in a... Complete Project Profile

  552 - ODEC Wildcat Point Raw Water Supply

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Microtunneling Slurry Peach Bottom, PA ODEC Mixed Face 830' x 60"Ø
SUMMARY: ODEC’s Wildcat Point Generation Facility (WPGF) in Cecil County, MD will use water from the Conowingo Reservoir in Lancaster County, PA. The Wildcat Point Raw Water Supply Project, consisting of a pump house, wet well shaft and pipelines to convey water from the Susquehanna River to WPGF. These pipelines run through an 830', 60" diameter microtunneled Permalok® steel casing, completed in June... Complete Project Profile

  551 - Crabtree (Phase II) & Upper Pigeon House (Phase I) Interceptor Tunnels, Schedule 1 & 2

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Microtunneling Slurry Raleigh, NC City of Raleigh Mixed Face 1,685' x 75.4" & 1,007' x 60"Ø
SUMMARY: The City of Raleigh, NC Public Utilities Department has constructed a major upgrade to its Crabtree Creek Interceptor system designed to alleviate hydraulic restrictions, accommodate future projected flows, and minimize SSOs by installing 41,000 lf of 54”, 60”, and 72” gravity sewer. A total of 5,000 lf broken into 14 separate drives by slurry microtunneling methods that went underneath... Complete Project Profile

  550 - SAWS WRIPP Segment 2B

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Microtunneling Slurry Von Ormy, TX SAWS Mixed Face 1,269' x 73.5"Ø
SUMMARY: Bradshaw Construction completed two drives with four shafts (two per drive) at each tunnel location for a new waterline. The Medina River drive (726 linear feet) included a 70 and 105 foot deep shafts, respectively. The second tunnel at Medio Creek (543 linear feet) consisted of 50 and 55 foot shafts, respectively. 73.5 inch steel casing was installed by slurry microtunneling for both drives... Complete Project Profile

  549 - 36" Southwest Transmission Main Relocation

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Microtunneling Slurry Elkridge, MD Howard County DPW Mixed Face 380' x 60'' Ø
SUMMARY: Bradshaw Construction microtunneled 380 linear feet of 60 inch steel casing under I-195 in Elkridge, MD. The subsurface conditions consisted of silt, sand, and gravel below the groundwater table. Bradshaw also installed two 32' OD liner plate shafts to depths of 24 VF & 32 VF for the launch & receiving shafts. The 36" PCCP carrier pipe was installed with the assistance of the general contractor... Complete Project Profile

  548 - Sewerage System Improvements Division C, Phase 1 & Suction Lines

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Microtunneling Slurry Portsmouth, VA HRSD Soft Ground 110' x 43'' Ø
SUMMARY: Bradshaw Construction microtunneled 110 linear feet of 43 inch steel casing under a CSX railroad track in Portsmouth, VA. The subsurface conditions consisted of loose, poorly graded & silty sand (SP-SM), below the groundwater table. Settlement points were monitored along the railroad, with all readings measuring less than 1/8 of an inch. Mining was conducted on a 24/7 basis per the requirements... Complete Project Profile

  547 - College Drive Waterline Phase II

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Microtunneling Slurry Suffolk, VA City of Suffolk Soft Ground 370' x 30'' Ø
SUMMARY: Bradshaw Construction microtunneled a single 370 linear feet drive of 30 inch steel casing under I-664 in Suffolk, VA. The subsurface conditions consisted of loose clayey & silty sands (SC & SM) below the groundwater table. Settlement was less than an 1/8 of an inch. Bradshaw installed a 16 inch restrained joint ductile iron pipe for a water main inside the jacked casing. Since this was a... Complete Project Profile

  545 - Water Treatment Plant 5 MGD Capacity Expansion New Raw Water Pump Station

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Microtunneling Slurry Livingston, TX TRA Soft Ground 780' x 36" Ø
SUMMARY: Bradshaw was contracted to install twin 36 inch steel casings from a 30 foot deep pump station shaft at the shoreline of Lake Livingston Reservoir to an intake cofferdam in the lake. Each microtunneled casing was 390 foot long and was used to install 24 inch ductile iron carrier pipes. The soil conditions consisted of clay and sandy silt 20 feet below the water table. Due to the non-cohesive... Complete Project Profile

  544 - CIAC Water Project Segment 2, Phase 1: Rivercrossing

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Microtunneling Slurry Tampa, FL City of Tampa Mixed Face 428' x 60" Ø
SUMMARY: This microtunnel project was part of the Design/Build Capital Improvements Program for the City of Tampa. For future city growth, Bradshaw microtunneled a 60" x 428' steel casing under the Hillsborough River for a new 36" DIP water main. Two shafts were constructed: a 23' ID x 45' deep launch shaft at Julian B. Lane River Park and a 10' OD x 40' deep drilled receiving shaft at the Straz... Complete Project Profile

  543 - Carson Loop Water Main Replacment Phase VI-B

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Microtunneling Slurry Leeds, AL Birmingham Water Works & Sewer Board Mixed Face 1174' x 59" Ø
SUMMARY: Bradshaw Construction Corporation completed a microtunnel drive crossing under an interstate and state highway in Birmingham, Alabama. The project consisted of 1,174 feet of 59 inch jacked steel casing for a 36 inch ductile iron water main. Ground cover under the highways ranged from 10 to 100 feet while shafts were an average of 22 feet deep. Mining conditions began with a mixed face of... Complete Project Profile

  541 - Mansfield Wastewater Treatment Plant - Phase 1, Raw Water Intake & Pump Station

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Microtunneling Slurry Austin, TX Travis County Mixed Face 530' x 43" Ø
SUMMARY: Bradshaw was selected to install a 43 inch steel casing by microtunnel outside Austin, TX. The microtunnel was launched from a 190 foot deep shaft at the Mansfield Dam on Lake Travis. The 530LF of lined and coated casing was microtunneled into Lake Travis and the MTBM was recovered underwater. Many of the challenges of the project were related to the deep shaft, underwater MTBM recovery and the... Complete Project Profile

  534 - Odenton Town Center Sewer Interceptor

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Microtunneling Slurry Odenton, MD Anne Arundel County Soft Ground 280' x 43" Ø
SUMMARY: After another subcontractor failed to complete a guided-bore, Bradshaw Construction was contracted for the installation of 280 linear feet of 43 inch steel casing and a 30 inch ductile iron sewer pipe for an interceptor. The casing was jacked behind a microtunnel boring machine through medium dense sands and sticky clay below the water table. Performing the microtunnel out of a shaft that was... Complete Project Profile

  533 - Fort Meade Reclaimed Water

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Microtunneling Slurry Laurel, MD Howard County Soft Ground 631' x 43"-60" Ø
SUMMARY: Bradshaw Construction installed a) 240 linear feet of 60 inch steel casing to house twin 20 inch ductile iron water lines under MD Route 32 and b) 410 linear feet of 43 inch steel casing for a 24 inch ductile iron water line under the Little Patuxent River as part of the Fort Meade Reclaimed Water Project. The casings were jacked behind a microtunnel boring machine in soft ground conditions... Complete Project Profile

  532 - South Platte Interceptor

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Microtunneling Slurry Brighton, CO MWRD Mixed Face 2,620' x 78"- 96" Ø
SUMMARY: Bradshaw Construction was contracted to mine five microtunnel crossings on Metro PAR 1088. Crossings at 168th & 160th Avenues were jacked with 96 inch steel casing. Crossings for the South Platte River & E-470 are completed and utilized 78 inch steel casing. The ground conditions consist of sand, gravel, coarse alluvium, and cobbles below the groundwater table. The scope also includes several... Complete Project Profile

  527 - River Road Interceptor

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Microtunneling Slurry Prospect, KY Louisville & Jefferson MSD Soft Ground 1,133' x 97.91"Ø
SUMMARY: Bradshaw Construction completed 1,133 foot microtunnel of 96 inch steel casing in a single drive for the Metropolitan Sewer District, located just outside of Louisville, KY. The tunnel was a contractor bid alternate design from (6) separate tunnels to (1) cost-effective large, long tunnel. A 42 inch fiberglass sewer and 30 inch PVC force main were installed within the casing and grout... Complete Project Profile

  526 - Smith WWTF Force Main Phase B

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Microtunneling Slurry Mobile, AL City of Mobile Soft Ground 240' x 60" Ø
SUMMARY: Bradshaw Construction installed 240 linear feet of 60 inch Permalok steel casing by microtunneling. The welded steel casing was installed on a 24/7 schedule in soft ground below the water table underneath a CSX railway. A 42 inch ductile iron carrier pipe was installed through the tunnel. Recovery of the MTBM within flowing ground adjacent to a truck route created additional complications that... Complete Project Profile

  525 - East Princess Anne Trunk Force Main Reinforcement-Section A

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Microtunneling Slurry Virginia Beach, VA HRSD Soft Ground 336' x 60"Ø
SUMMARY: Bradshaw Construction microtunneled 336 linear feet of 60 inch steel casing at the intersection of Nimmo Parkway and General Booth Boulevard in Virginia Beach, VA. The subsurface conditions consisted of medium dense, poorly graded, sand (SP-SM) below the groundwater table. Settlement points were monitored along the alignment in the streets. Minimal settlement was measured and well within the... Complete Project Profile

  524 - Smith WWTF Force Main Phase A

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Microtunneling Slurry Mobile, AL City of Mobile Soft Ground 120' x 60"Ø
SUMMARY: Bradshaw Construction installed 120 linear feet of 60 inch welded steel casing by microtunnel. We overcame a significant change in ground conditions from the bid documents to mine through a full face of clay underneath the water table crossing below Central Illinois Railroad. In addition, the reception plan was modified due to utility conflicts which the General Contractor encountered during... Complete Project Profile

  523 - 42 Inch Force Main - 6th and Canal Pump Station PS to Angelica Creek

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Microtunneling Slurry Reading, PA City of Reading Mixed Face 436' x 60" Ø
SUMMARY: Bradshaw constructed (2) shafts, (1) 9 foot diameter receiving shaft and (1) 30 foot diameter launching shaft for mining 436 linear feet and installing 60 inch steel casing by microtunneling for a 42 inch ductile iron force main under Schuykill River. Due to the possibility of contaminated groundwater and the need to minimize dewatering on the shaft excavation, it was necessary to install secant... Complete Project Profile

  521 - Crabtree Basin Waste Water Conveyance Phase 1

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Microtunneling Slurry Raleigh, NC City of Raleigh Mixed Face 660' x 60"-72"Ø
SUMMARY: Phase 1 of the Crabtree Basin Wastewater improvements project consisted of 21,000 feet of 30" to 72" diameter gravity sewer pipe. Three segments were designed for trenchless construction by microtunneling. These included two road crossings and one crossing under existing 60" RCP pipeline connected to an active pump station. Bradshaw microtunneled all three crossings in rock and mixed face soil... Complete Project Profile

  520 - MDC Thermal Plant Interconnect Project

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Microtunneling Slurry Miami, FL MDC WASD Soft rock 880' x 37.5" Ø
SUMMARY: Bradshaw Construction contracted with Consolidated Edison (CES) to install 24" chilled water lines on an accelerated schedule in downtown Miami, Florida. The project consisted of open-cut, shafts, and installing 36" Permalok steel casing by microtunneling through limestone under city streets and the CSX Railroad. Four seperate tunnels were launched out of twin launch shafts. The launch shafts... Complete Project Profile

  515 - I-66 Sanitary Sewer Crossing

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Microtunneling Slurry Fairfax, VA Fairfax County, VA Mixed Face 330' x 43" Ø
SUMMARY: Bradshaw Construction contracted with the Fairfax County Department of Public Works to install a new 18" sanitary sewer line across I-66, abandoning a previously installed line. During shaft installation, unforeseen partially weathered schist was encountered that could only be excavated using a hammer drill. Fairfax County performed additional geotechnical investigation to determine the extent... Complete Project Profile

  513 - NW 170th Street

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Microtunneling Slurry Hialeah, FL Miami-Dade WASD Mixed Face 524' x 54" Ø
SUMMARY: Bradshaw Construction installed 524 linear feet of 52.5 inch Permalok steel casing by microtunneling underneath the heavily traveled I-75 highway. We then installed a 36 inch ductile iron carrier pipe within the tunnel as a new water main. Bradshaw assisted the General Contractor with subcontractor supervision at no additional cost, helping to insure quality of the shaft and concrete work... Complete Project Profile

  512 - I-95/MD-43 ETL Interchange

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Microtunneling Slurry Rosedale, MD MTA Soft Ground 468' x 87.5"
SUMMARY: This project involved jacking 468 feet of 87.5" steel casing under I-95 near Baltimore, MD. The soil conditions included sand, silt, & clay below the water table. Microtunneling was required by the owner due to the ground conditions and due to the sensitivity of I-95 (an 8 lane highway) to any disturbance. The casing was installed on line and grade without incident. Bradshaw also installed... Complete Project Profile

  510 - McKinley Street Interceptor

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Microtunneling Slurry Hollywood, FL City of Hollywood Soft Ground 300' x 96" Ø
SUMMARY: Bradshaw Construction installed a total of 300 linear feet of 96 inch Permalok steel casing in two separate drives. The first drive was 75 linear feet under US Route 1 and the second was 225 linear feet under both Dixie Highway and Florida East Coast Railroad. A 66 inch prestressed concrete cylinder pipe was installed within the steel casing for both drives. The tunnels were constructed in... Complete Project Profile

  509 - OSU Chilled Water Microtunnel

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Microtunneling Slurry Columbus, OH Ohio State University Mixed Face 648' x 60.5" Ø
SUMMARY: As part of a major construction project at the Ohio State Medical Center, new chilled water distribution pipelines were designed under the very busy and congested campus. The design included twin pipe-jacked casings under the areas where trenching would have been untenable. Microtunneling was specified. Bradshaw installed 4 microtunnels through glacial deposits below the groundwater table. Complete Project Profile

  507 - Little Patuxent Parallel Interceptor Sewers 11

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Microtunneling Slurry Columbia, MD Howard County Mixed Face 1,565' x 60" Ø
SUMMARY: This project involved the construction of six tunnels, totaling 1,600'. The tunnels passed under Maryland State and Howard County roads on three phases of Howard County's Little Patuxent Parallel Interceptor project. 60" of jacked steel casing was used to install 36 to 42" of fiberglass reinforced carrier pipe for a gravity sewer. Subsurface conditions ranged from alluvial deposits of gravel and... Complete Project Profile

  505 - Piney Branch Sewer Interceptor Upgrade - Phase 1

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Microtunneling Slurry Waldorf, MD Charles County Soft Ground 1,600' x 60" Ø
SUMMARY: Bradshaw Construction completed five tunnels, totaling 1600', by microtunneling below lakes, swamps, and roadways. The tunnels were for Charles County's Piney Branch Sewer Interceptor Phase 1. 60" jacked steel casing was used to install 42" PVC carrier pipe for a gravity sewer. Subsurface conditions included silt, clay, and sand. Bradshaw Construction also installed five steel sheeted jacking... Complete Project Profile

  504 - Castleton Relief Sewer Project - Phase 1

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Microtunneling Slurry Indianapolis, IN Citizens Energy Group Mixed Face 2,740' x 53" Ø
SUMMARY: Bradshaw Construction installed 2,740' of 42" reinforced concrete pipe for a relief sanitary sewer by microtunneling through sand with cobbles and boulders below the groundwater table at an average depth of 20'. The microtunneling was accomplished in four drives, the longest of which was 810'. Six access shafts were constructed using steel ribs and liner plates (16' and 20' in diameter) and... Complete Project Profile

  502 - Granby Street Sewer

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Microtunneling Slurry Hartford, CT Hartford Metropolitan District Soft Ground 2523' x 53"-74" Ø
SUMMARY: Bradshaw Construction Corporation contracted with Manafort Brothers, Inc., constructing three tunnels via microtunneling totaling roughly 2,500 linear feet. Individual tunnels were mined at lengths of 145 linear feet, 950 linear feet, and three runs collectively totaling 1560 linear feet, ranging in sizes from 42 inch to 60 inch in diameter. Tunnels were constructed through very soft silts and... Complete Project Profile

  501 - Little Patuxent Parallel Interceptor Sewers 9

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Microtunneling Slurry Columbia, MD Howard County Mixed Face 1,565' x 60" Ø
SUMMARY: This project involved the construction of six tunnels, totaling 1,600'. The tunnels passed under Maryland State and Howard County roads on three phases of Howard County's Little Patuxent Parallel Interceptor project. 60" of jacked steel casing was used to install 36 to 42" of fiberglass reinforced carrier pipe for a gravity sewer. Subsurface conditions ranged from alluvial deposits of gravel and... Complete Project Profile

  500 - Cow Branch Sewer Replacement

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Microtunneling Slurry Woodbridge, VA PWCSA Soft Ground 944' x 43" Ø
SUMMARY: The Cow Branch Sewer project in Woodbridge, VA, consisted of the installation of approximately 8,000' of new gravity sewer main in the 8" to 36" diameter size range. 944' of 36" sewer main was to be installed via microtunneling under a wetland area that empties into the Potomac River. This project represented the Prince William County Authority's (PWCSA) first microtunneling project. In lieu of... Complete Project Profile

  496 - NW Precinct Utility Infrastructure

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Microtunneling Slurry Athens, GA UGA Soft Ground 236' x 59" Ø
SUMMARY: As part of a new chiller plant and distribution network, the University of Georgia had to install two 20" chilled water pipelines under the busy intersection of Baxter and Lumpkin Streets on campus. The design called for a single 59" steel casing to house both lines. Trenchless construction by microtunneling was specified to reduce impacts to the surface traffic and buried existing utilities and... Complete Project Profile

  494 - Manchester Creek Outfall

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Microtunneling Slurry Rock Hill, SC City of Rock Hill Soft Ground 311' x 59" Ø
SUMMARY: Bradshaw jacked a 59" diameter steel casing 311 feet under interstate highway I-77 behind a microtunnel boring machine (MTBM). The subsurface conditions consisted of clay and sand below the groundwater table. In order to mobilize to the jacking shaft, about a mile of forest was cleared and the equipment was dragged in on sleds. A slide rail system was used for the jacking shaft with special... Complete Project Profile

  493 - Delta Power Intake/Blowdown Tunnel

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Microtunneling Slurry Delta, PA Calpine Corp. Mixed Face 1,515' x 60" Ø
SUMMARY: The Delta Power Plant project in Delta, PA, consisted of a 565 MW power generating facility that recovers heat from gas exhaust leaving gas turbines. The turbines burn either natural gas or low sulfur diesel fuel oil. A microtunnel solution to installing the cooling water intake and return was developed by the owner, contractor, and tunnel subcontractor. 1,515' of 60" steel casing was jacked... Complete Project Profile

  492 - Route 13 Interceptor

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Microtunneling Slurry Dover, DE City of Dover Soft Ground 239' x 50" Ø
SUMMARY: Bradshaw Construction completed two tunnels of 50" steel casing totaling 291' in Dover, DE. The steel casing was installed by microtunneling and used for 24" and 27" PVC sanitary sewer. There were two main challenges for the project. The greatest challenge was retrofitting a jacking shaft meant for auger-boring to suit the needs of slurry microtunneling. To do this, our crew formed and poured... Complete Project Profile

  491 - FDOT SR 55 US-19 Roadway Improvements

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Microtunneling Slurry Clearwater, FL FDOT Soft Ground 636' x 60" Ø
SUMMARY: Bradshaw Construction mined 2 separate microtunnel drives for the Florida Department of Transportation. One drive was 300 linear feet and the other run was 336 linear feet. A 48 inch and a 42 inch ductile iron pipe water main was installed within the 60 inch steel casing, respectively. The tunnels were below the water table and at a depth ranging from 10 to 30 feet deep. The soils consisted of... Complete Project Profile

  487 - Little Patuxent Parallel Interceptor Sewers 2

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Microtunneling Slurry Columbia, MD Howard County Mixed Face 450' x 59" Ø
SUMMARY: This project involved the construction of two tunnels, totaling 450'. The tunnels passed under Maryland State and Howard County roads on three phases of Howard County's Little Patuxent Parallel Interceptor project. 59" of jacked steel casing was used to install 42" fiberglass reinforced carrier pipe for a gravity sewer. Subsurface conditions ranged from alluvial deposits of gravel and cobbles to... Complete Project Profile

  485 - Potomac Interceptor Sewer System Improvements

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Microtunneling Slurry Arlington , VA Arlington County Mixed Face 1,193' x 59" Ø
SUMMARY: Bradshaw Construction has completed three tunnels by microtunneling, totaling 1,183 linear feet, below highways and the Arlington National Cemetery for Arlington County's Potomac Interceptor. 60-inches of steel casing was installed by microtunnel through soft ground to place 42-inch FRP carrier pipe for a gravity sewer on one tunnel. 48-inch RCP was direct jacked through rock and mixed face... Complete Project Profile

  483 - Allen's Creek Water Transmission Main

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Microtunneling Slurry St. Petersburg, FL City of St. Petersburg Soft Ground 229' x 51" Ø
SUMMARY: Bradshaw Construction was installed 229 linear feet of 51" steel casing by microtunneling for the City of St. Petersburg Water Department. A 36 inch water transmission main was installed inside the casing. During mining, Bradshaw managed to maintain line and grade through very loose sand to medium dense fine sand and slightly silty sand, all below the water table. Complete Project Profile

  481 - CIAC Segment 1 Water Transmission Main

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Microtunneling Slurry Tampa, FL City of Tampa Soft Ground 2,028' x 60" Ø
SUMMARY: Bradshaw Construction was contracted by CH2MHill Constructors Inc. to design build 2,028 linear feet for 60 inch steel casing by microtunneling for a 42 inch ductile iron water main. Bradshaw worked along side Garney Company who installed the open cut portion of the project. The ground conditions consisted of soft ground below the water table. Most of the drives were completed under a heavily... Complete Project Profile

  480 - Belmont North Relief Interceptor - Section 1

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Microtunneling Slurry Indianapolis, IN City of Indianapolis Mixed Face 4,000' x 87.5" Ø
SUMMARY: Bradshaw Construction installed 5,200' of 72" reinforced concrete pipe for a sanitary sewer relief interceptor. 4,000' of pipe was installed by microtunneling through sand with cobbles and boulders and glacial till below the groundwater table at an average depth of 30'. The microtunneling was accomplished in six segments, the longest being 1,150' long using three intermediate jacking stations... Complete Project Profile

  473 - CIAC Water Transmission Main MLK / IDA

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Microtunneling Slurry Tampa, FL City of Tampa Soft Ground 477' x 60" Ø
SUMMARY: This project consisted of a 477 linear feet of microtunnel for the 12th Street Force Main. We assisted in the construction of shafts. 60 inch Permalok steel casing was used for the microtunneling and 42" ductile iron carrier pipe that was installed within the casing and grouted in place. Ground conditions were soft and the tunnel was mined at minimum cover. Complete Project Profile

  470 - I-275 Drainage Tunnels

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Microtunneling Slurry Tampa, FL FDOT Mixed Face 2,636' x 51"- 95" Ø
SUMMARY: Bradshaw Construction was contracted for this signature FDOT project to install the first one-pass microtunneling system using reinforced concrete pipe from 42 inch to 72 inch. The total linear footage for this gravity storm sewer project was approximately 2,600. The cover below the heavily traveled highways was less than one diameter in most instances to create the gravity flow storm system... Complete Project Profile

  466 - 12th Street Force Main Replacement

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Microtunneling Slurry Tampa, FL City of Tampa Soft Ground 2,217' x 42"-48" Ø
SUMMARY: Bradshaw Construction was part in a Tampa Design/Build project. This project consisted of 3 separate drives mined by microtunneling. The first drive consisted of 477 linear feet for 60 inch steel casing to accommodate a 48 inch force main. The second was 450 linear feet and the third at a length of 1,290 linear feet for 60 inch steel casing for a 42 inch force main. These drives were for... Complete Project Profile

  465 - City of Cumming Raw Water Intake

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Microtunneling Slurry Cumming, GA City of Cumming Soft Ground 350' x 66" Ø
SUMMARY: The City of Cumming, GA constructed a new raw water intake in Lake Lanier. Bradshaw Construction was contracted to install the 66" steel casing pipe from the on shore pump station shaft to the intake structure at the bottom of the lake. The pump station shaft was constructed by the jet grout method. Bradshaw jacked the casing using a slurry microtunneling machine. The intake pipeline was designed... Complete Project Profile

  464 - Lower Catoma Interceptor Replacement

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Microtunneling Slurry Montgomery, AL City of Montgomery Soft Ground 440' x 83" Ø
SUMMARY: Bradshaw Construction Corporation completed four soft ground tunnels under state roads and a CSX railroad by microtunneling as part of a 37,000 linear foot long sewer pipeline project. The tunnels ranged in diameter from 83 to 96 inches and 110 to 220 linear feet in length. The smaller tunnels were direct jack 78-inch Hobas pipe, and the larger railroad tunnels were 2-pass Permalok steel casing... Complete Project Profile

  462 - Bartow-NE Transmission Line

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Microtunneling Slurry St. Petersburg, FL Progress Energy Soft Ground 607' x 51" Ø
SUMMARY: Bradshaw was contracted to pipe jack and install a 44 inch Hobas pipe that was provided by Blevins Road Boring. Inc. The drives consisted of (2) twin runs to accommodate Progress Energy's underground transmission lines. The first twin run was 128 linear feet and the second was 207 linear feet, for a total of 607 linear feet for the project. The ground conditions consisted of soft ground... Complete Project Profile

  453 - Herbert Run Interceptor

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Microtunneling Slurry Landsdowne, MD Baltimore County DPW Soft Ground 905' x 63" Ø
SUMMARY: Bradshaw Construction completed 4 drives of 63" Permalok steel casing by microtunneling in Landsdowne, MD. The 4 drives totaled 905 LF and were under CSX and Amtrak railroads, and US-1 and I-895 highways. The microtunnels were completed using a Herrenknecht 1200TC with a Soft Ground cutting head. The tunnels were originally designed to be 72" Hand Mined Liner Plate, but were changed to Permalok... Complete Project Profile

  452 - Dulles Dedicated Fire System

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Microtunneling Slurry Dulles Airport, VA MWAA Rock 2,100' x 43" Ø
SUMMARY: Bradshaw Construction installed 2,100' of 43" Permalok steel casing for the 18" dedicated fire system. The tunnels were installed by microtunneling through shale beneath active runways, taxiways, and taxi lanes. The microtunneling was completed in four segments, the longest being 585' long under Runway 19L-01R. Bradshaw also installed the 18" DIP in the tunnels once mining was completed. Crews... Complete Project Profile

  434 - Upper Jones Falls Interceptor Sewer - Phase 2

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Microtunneling Slurry Baltimore, MD Baltimore City DPW Mixed Face 6,600' x 60" - 96" Ø
SUMMARY: Bradshaw jacked 6,000' of 48" polycrete sewer pipe using slurry microtunneling through rock and mixed face ground conditions. The longest microtunnel drive was over 900'. Drill and blast tunneling was used for 600’ of the sewer installation. The rock strength (UCS) was up to 43,500 psi. Eleven access shafts with pre-cast manholes and/or cast-in-place structures were installed. A unique live... Complete Project Profile

  424 - Locust Point Interceptor

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Microtunneling Slurry Baltimore, MD City of Baltimore Soft Ground 1,000 x 43" Ø
SUMMARY: Bradshaw Construction installed 1,000 linear feet of 36 inch vitrified clay pipe using a Herrenknecht AVN 800A slurry microtunneling system. In addition, Bradshaw installed 240 linear feet of 6" vitrified clay pipe using an Akkerman “pilot tube” guided boring system. The ground conditions were silt, sand, gravel and rubble fill below the water table. Bradshaw installed jacking and... Complete Project Profile

  421 - Table Rock Reservoir Intake Tunnel

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Microtunneling Slurry Cleveland, SC Greenville Water System Rock 480' x 60" Ø
SUMMARY: The Table Rock Intake project was a technically complex water-intake project, which required pinpoint accuracy. The project involved the installation of a raw water intake tunnel below the Cleveland, SC, dam and its associated reservoir. The project involved a marine retrieval of the MTBM via a miniscule shaft - 8.5' in diameter to be exact. Tunneling under a dam is inherently a highly sensitive... Complete Project Profile

  420 - Susquehanna River Intake Tunnel

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Microtunneling Slurry Wrightsville, PA York Water Company Rock 640' x 59" Ø
SUMMARY: Bradshaw jacked twin 59" diameter steel casings 320 feet using a microtunnel boring machine (MTBM). The raw water intake alignment went from a new on-shore pump station to a new underwater intake structure in the Susquehanna River. The subsurface conditions consisted of weak to strong schist. The intake structure was under about 20' of water. Several interventions were made into the head of the... Complete Project Profile

  390 - Libbytown Storm Drain Project

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Microtunneling Slurry Portland, ME City of Portland Soft Ground 450' x 24" Ø
SUMMARY: This project was to install a 24" storm sewer pipe for the City of Portland, Maine. Bradshaw used an Akkerman SL-24 microtunnel boring machine to one pass pipe jack 24" Hobas sewer pipe from shafts constructed by the contractor. The challenge on this project turned out to be the ground conditions which included unexpected cobbles and boulders. These conditions stopped the microtunnel boring... Complete Project Profile

  324 - Cohas Brook Interceptor - Phase 1

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Microtunneling Slurry Manchester, NH City of Manchester Mixed Face 2,400 x 54" Ø
SUMMARY: Bradshaw installed 2,400’ of 42” RCP using an Akkerman Slurry Microtunnel Boring Machine (SL-44). There were 5 separate microtunnel drives, 3 of which encountered boulders requiring rescue shafts. Three drives crossed major highways and one drive crossed under the Pine Island Pond. The geologic report for the project stated the tunnel elevation was selected to avoid any boulders in the... Complete Project Profile

  231 - Chesapeake Avenue Sewer

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Microtunneling Slurry Edgemere, MD Baltimore County Soft Ground 212' x 30" Ø
SUMMARY: In 1991, Bradshaw Construction Corporation (formerly L M Bradshaw Contracting, Inc.) installed the first jacked pipe using slurry microtunneling in the US mid-Atlantic region. An Iseki “Unclemole” microtunnel system was used to jack 212' of 30" steel casing for a 12' DIP sewer (two pass method) under a Chesapeake Bay estuary in extremely soft tidal marsh sand and silt. Bradshaw dewatered... Complete Project Profile

  472 - Sewer Improvements at Fenwick Road and Essex Avenue

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Microtunneling Pilot Tube Fairfax County, VA Fairfax County DPWES Soft Ground 1,800' x 16" Ø
SUMMARY: Bradshaw Construction installed 1,800' of 12" vitrified clay pipe to increase sewer capacity in two neighborhoods in Fairfax County, VA. The line was installed by pilot tube microtunneling through clay, silt, and sand. Due to some cobbles that were encountered, and several existing utilities, Bradshaw was required to perform some of the sewer installation by Open-Cut. There was also a previously... Complete Project Profile

  445 - BWI Stage 3B 20" Transmission Line

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Microtunneling Pilot Tube Baltimore, MD Southwest Airlines, Inc. Soft Ground 880' x 30" Ø
SUMMARY: Bradshaw Construction installed 880 linear feet of 30 inch Permalok steel casing at Baltimore Washington International (BWI) airport in 3 drives under a railroad and 2 highways using the Akkerman pilot tube guided boring method. The ground conditions were extremely dense silt and sand with occasional stiff clays. Shafts for the drives were supported by steel sheeting, trench boxes as well as... Complete Project Profile

  424 - Locust Point Interceptor

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Microtunneling Pilot Tube Baltimore, MD City of Baltimore Soft Ground 240' x 10" Ø
SUMMARY: Bradshaw Construction installed 240 linear feet of 6" vitrified clay pipe sewer using an Akkerman GBM-240 “pilot tube” guided boring system. The ground conditions were silt, sand, gravel and rubble fill. The Akkerman GBM system pipe jacks in three passes (pilot tube, cased augers, and product pipe) for installation typically to +/-1 inch of design alignment and elevation. The pilot tube... Complete Project Profile

  540 - Improvements to Lower Gwynns Runs Interceptor, Phase II

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TBM Tunneling Conventional Baltimore, MD City of Baltimore Rock 395', 277', 536', 320', 343', 389', & 283' x 72"Ø
SUMMARY: Bradshaw completed 2,500' of tunnel from Franklin Street to Baltimore Street for a 36" gravity sanitary sewer. The 72" tunnel consisted of four segments, the longest of which was 1,200' beneath Amtrak and Norfolk Southern Railroads. Local geology consisted of very hard rock, with UCS tests of up to 37,000 psi, and was further complicated by the presence of periodic veins of highly decomposed... Complete Project Profile

  519 - DCW M Street Diversion Sewers

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TBM Tunneling Conventional Washington D.C., DCW Soft Ground 2,327' x 72"-144"Ø
SUMMARY: Bradshaw completed installation of 1,313 linear feet of 144 inch, and 1,014 liner feet of 72 inch rib and board tunnel for 110 inch and 48 inch fiberglass reinforced sewer. An Akkerman BS-120 digger shield and an Akkerman WM-60 TBM were used to excavate the tunnels. The work was in a busy urban area adjacent to the Anacostia River and a CSX Railroad. The tunnel was excavated through clay and... Complete Project Profile

  497 - International Paper Company Effluent Pipeline

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TBM Tunneling Conventional Cantonment, FL International Paper Soft Ground 1150' x 75" Ø
SUMMARY: Bradshaw Construction installed 1,150' of 75' O.D. Rib and Board Tunnel, as well as 48" DIP Carrier pipe to be utilized as an effluent pipeline. Bradshaw Construction worked through severe weather conditions which caused shaft movement and water intrusion. In addition, the work was completed within a residential zone. Bradshaw worked closely with the General Contractor and local residents... Complete Project Profile

  478 - National Center Sanitary Sewer Project

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TBM Tunneling Conventional Crystal City, VA Arlington County Mixed Face 1,890' x 68" Ø
SUMMARY: The NCSS project highlights Bradshaw Construction's ability to redesign projects to increase efficiency, decrease costs, and streamline logistics. The NCSS project was initially designed as a pilot tube MTBM job. However, this would have involved the installation of 8 shafts in the middle of Jefferson Davis Highway - a major artery into and out of DC. We redesigned the project as a rib-and-board... Complete Project Profile

  477 - Abingdon WTP Expansion

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TBM Tunneling Conventional Abingdon, MD Harford County Public Works Soft Ground 372' x 114" Ø
SUMMARY: Bradshaw Construction successfully completed a TBM Tunnel using an Akkerman Digger Shield and 114"Ø Rib & Board Supports under Interstate 95 for the Abingdon Waste Water Treatment Plant. With the key goal of minimizing potential settlement of I-95, the tunnel size was reduced from a plan diameter of 144" to 114". However, the size reduction increased the challenge of installing the Ductile Iron... Complete Project Profile

  468 - Flint River Transmission Main - Phase 2

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TBM Tunneling Conventional Atlanta, GA City of Atlanta Mixed Face 1,040' x 72" Ø
SUMMARY: The Flint River Transmission Main project was constructed using conventional TBM tunneling in the Hapeville neighborhood of south Atlanta, GA beneath Old Dixie Highway and an active Norfolk Southern railroad. The single 1,040' tunnel consisted of three separate curves. The first two were per plan, while the third was a 650' radius curve added during the tunnel excavation process to avoid a... Complete Project Profile

  457 - Battery Park Trunk Sewer Tunnel

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TBM Tunneling Conventional Richmond, VA City of Richmond Soft Ground 3,400' x 144" Ø
SUMMARY: Bradshaw responded to the City of Richmond, Virginia's emergency flooding caused by Tropical Storm Ernesto by installing 3,400’ of 110” fiberglass pipe in tunnel to permanently by-pass a collapsed combined sewer. Bradshaw used an Akkerman BS-120 digger shield and ribs and boards to construct the tunnel. Bradshaw pipe jacked 1,000’ of 48” RCP in one run and 260’ of 60” RCP in another... Complete Project Profile

  441 - Sumter Avenue Storm Drain

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TBM Tunneling Conventional Rock Hill, SC City of Rock Hill Soft Ground 191 x 84" Ø
SUMMARY: Bradshaw installed a replacement storm drain under the Norfolk Southern Railroad. The tunnel traversed two mainline and one siding sets of tracks in Rock Hill, SC. The existing CMP storm drain was collapsing. The tunnel was accomplished by installing 84" diameter x 24" wide smooth back 4-flange liner plates behind a shielded Akkerman tunnel machine. The machine was launched into the base of an... Complete Project Profile

  432 - Irwin Creek Relief Sewers Phase 2

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TBM Tunneling Conventional Charlotte, NC Charlotte-Mecklenburg Mixed Face 4,700' x 60"-102" Ø
SUMMARY: Bradshaw constructed 23 shafts that were 20 to 50 feet in depth of soldier pile and wood lagging. Rib and board was used above the water table and liner plate for below. 4700 linear feet of 60-102 inch tunnels for 36 inch and 54 inch ductile iron pipe. 900-1300 linear feet included curves by tunnel boring machine with liner plate under NSR Railroad. Drill & Blast. Complete Project Profile

  430 - Deep River Outfall Sewer

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TBM Tunneling Conventional High Point, NC City of High Point Rock 1,400' x 82"- 96" Ø
SUMMARY: This project involved the utilization of two tunneling methods: hand mine drill & blast, and a TBM capable of mining through hard rock conditions. For the most part the 1,000' TBM run was self-supporting, but some of the weaker zones required rock bolts, roof channels, and even liner-plates for a short reach. Two drill and blast road crossings totaling 400' were completed on this job. Both drill... Complete Project Profile

  418 - Elizabethtown Tunnel

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TBM Tunneling Conventional South Bound Brook, NJ Elizabethtown Water Co. Rock 1,245' x 101" Ø
SUMMARY: The Elizabethtown project highlights Bradshaw's ability to quickly adapt to major problems in an efficient, expedient manner. A special head was fabricated specifically for this project, based upon the unique conditions indicated by the boring logs. However, the head proved ineffective. Our fabrication department modified the head, and anticipated production rates returned to the expected amount... Complete Project Profile

  377 - North Central Hillsborough Inter-tie - Phase 2

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TBM Tunneling Conventional Tampa, FL Tampa Bay Water Authority Rock 300' x 99" Ø
SUMMARY: Bradshaw Construction Corp. was subcontracted to Rockdale Pipeline Inc. (RPI) to tunnel under the Hillsborough river and install an 84-inch diameter water main in the tunnel. Two shafts were constructed on either side of the river by RPI using driven steel sheets. BCC mined the tunnel by jacking a 98-inch diameter steel casing behind a 101-inch diameter earth pressure balance (EPB) tunnel boring... Complete Project Profile

  370 - South Central Hillborough Intertie Phase 1

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TBM Tunneling Conventional Tampa, FL Tampa Bay Water Authority Soft Ground 1,888' x 99' - 101.5" Ø
SUMMARY: Bradshaw was subcontracted by Westra Construction to mine a total of (8) tunnels under state roads and open cut (2) drives for the Tampa Bay Water Authority. 101.5 inch and 99 inch rib and board supports were installed to accommodate and install a 72 inch steel water main. The ground conditions consisted of soft ground and was below the water table. Complete Project Profile

  308 - Fullerton Water Transmission Main Section I

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DIMENSIONS
TBM Tunneling Conventional Fullerton, MD Baltimore County DPW Soft Ground 1,707' x 112" Ø
SUMMARY: Bradshaw used a Lovat tunnel boring machine (TBM) to construct 1,707 feet of 112 inch OD rib and board tunnel for an 84 inch welded steel watermain. Bradshaw also installed a 42' x 72' x 35' deep elliptical NATM mining shaft. The tunnel ground conditions were alluvial deposits of silt, sand and gravel. The challenges of the project were: 1) the limited stand up time of the alluvial soils in... Complete Project Profile

  273 - Ruby Avenue Storm Sewer Extension

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DIMENSIONS
TBM Tunneling Conventional Kansas City, KS City of Kansas City Soft Ground 1,665' x 143"Ø
SUMMARY: Bradshaw Construction installed 1,665' of 143” O.D. steel rib and board tunnel for a 96” RCP storm sewer using a modified Lovat TBM. The tunnel was part of a 6,630’ storm sewer project to alleviate flooding in the Argentine area of Kansas City, Kansas. Bradshaw also installed a solder pile and wood lagging mining shaft that attached to an existing box culvert storm drain. The primary... Complete Project Profile

  255 - 96-Inch and 84-Inch Diameter Steel Water Main

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DIMENSIONS
TBM Tunneling Conventional Lanham, Maryland WSSC Soft Ground 900' x 132"Ø
SUMMARY: Bradshaw installed 900’ of 132” OD rib and board tunnel in two drives with mining and receiving shafts for each. The tunnels were excavated through silts and sands using a TBM digger shield. The first tunnel was under Route 50 and the second was under Amtrak Railroad’s high speed rails between DC and Baltimore. 84” and 96” OD steel water main was installed in the tunnels... Complete Project Profile

  1JV2 - Bushy Park Water Tunnel

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TBM Tunneling Conventional Bushy Park, SC Charleston CPW Soft Ground 14,847 x 99"Ø
SUMMARY: BTM Joint Venture, led by Bradshaw Construction, constructed 14,847’ of 99” raw water intake tunnel for the Commissioners of Public Works (CPW) of Charleston, SC. This tunnel extended CPW’s water source further up the Cooper River improving the quality and increasing the quantity of water. The entire tunnel was mined with a Lovat tunnel boring machine (TBM) through Cooper Marl... Complete Project Profile

  1JV1 - East Bay/Calhoun Drainage Facilities Division I - Collection Tunnel System

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TBM Tunneling Conventional Charleston, SC City of Charleston Soft Ground 2,880' x 120"Ø
SUMMARY: BTM Joint Venture, led by Bradshaw Construction, constructed the first deep storm sewer tunnel for the City of Charleston to control flooding along Calhoun Street to Marion Square Park. The work consisted of 2,880’ of 120” rib & board TBM tunnel for a 96” ID cast in place storm sewer, two (2) caisson shafts, and two (2) drop stack intakes. The principal challenge on the project was first... Complete Project Profile

  530 - Manchester Creek Outfall, Phase II

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GEOLOGY

DIMENSIONS
TBM Tunneling Pipe Jacking Rockhill, SC City of Rock Hill Mixed Face 405' x 60" Ø
SUMMARY: Bradshaw jacked two 60 inch diameter steel casings 15 feet below Dave Lyle Blvd. and Anderson Road using a conventional tunnel boring machine (TBM) in Rock Hill, SC. The 265 and 140 linear foot drives were part of a sanitary sewer outfall project. One 30-foot reach had to be hand mined through an unanticipated rock formation. Bradshaw finished the tunnels by installing 42 inch Ductile Iron Pipe... Complete Project Profile

  516 - 11th Street Corridor CSO Diversion

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DIMENSIONS
TBM Tunneling Pipe Jacking Washington, DC District of Columbia WASA Soft Ground 386' x 66" Ø
SUMMARY: Bradshaw direct jacked 386 linear feet of 54" reinforced concrete pipe via conventional TBM in two (2) drives, as part of the 11th Street Bridge project in Washington, DC. One drive was minded under I-295, while the other was under an SME wall for the new bridge. Ground conditions were primarily soft, wet silt, sand & clay; however, obstacles such as a large layer of river gravel and buried... Complete Project Profile

  499 - College of William & Mary Historic Campus Utility Improvements, Ph 1, Water Distribution Lines

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DIMENSIONS
TBM Tunneling Pipe Jacking Williamsburg, VA College of Wiliam and Mary Soft Ground 1,200' x 60" Ø
SUMMARY: The project for the College of William and Mary involved the construction of twin 600' by 60" diameter runs. 48" ID RCP was jacked behind a 60" diameter Akkerman TBM. Ground conditions encountered on the job included clay with some wet sand layers. The tunnels were used for steam and chilled water lines. Complete Project Profile

  489 - 30th Avenue North Storm Water Improvements

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DIMENSIONS
TBM Tunneling Pipe Jacking St. Petersburg, FL City of St. Petersburg Soft Ground 147' x 89" Ø
SUMMARY: Bradshaw Construction installed 147 linear feet of 72 inch reinforced concrete pipe for a storm water system needing improvements. This was accomplished by direct jacking in a single pass under a CSX Transportation Railroad at a depth of 10 feet below the existing grade. Bradshaw worked closely with the CSX Railroad to install dewatering within the right of way, allowing for this type of... Complete Project Profile

  488 - FDOT State Road 823

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DIMENSIONS
TBM Tunneling Pipe Jacking Hialeah, FL FDOT Soft Ground 183' x 102" Ø
SUMMARY: Bradshaw Construction used one pass pipe jacking to install 183 linear feet of 84 inch reinforced concrete pipe under the Florida East Coast Railway using a 102 inch Lovat TBM in earth pressure balance mode. The ground conditions were silt, sand and limestone below the water table. The alignment and reception plans were modified, allowing for the completed tunnel to maintain minimal cover from... Complete Project Profile

  479 - Appalachian State Steam Tunnel

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DIMENSIONS
TBM Tunneling Pipe Jacking Boone, NC Appalachian State University Rock 220' x 101.5" Ø
SUMMARY: Bradshaw Construction Corporation successfully installed 220' of 84" RCP to act as a steam tunnel for the Appalachian State University. This was achieved by utilizing a 101.5" Lovat TBM capable of mining through hard rock conditions. The pipe was jacked directly behind the TBM. Soil conditions consisted of hard biotite gneiss rock. Complete Project Profile

  475 - Chesapeake Avenue Rehabilitation

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DIMENSIONS
TBM Tunneling Pipe Jacking Baltimore, MD City of Baltimore Soft Ground 120' x 51" Ø
SUMMARY: Bradshaw Construction installed twin tunnels of 42" RCP storm sewer 60' each under a railroad in Baltimore, MD. There were several challenges and delays on the project. All of which stemmed from conflicting permits and access issues. When the methodology of using a TBM for pipe-jacking 42" RCP was finally approved by all parties it was under the allowance that all tunneling work would take... Complete Project Profile

  398 - US Capital Coal Handling System

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DIMENSIONS
TBM Tunneling Pipe Jacking Washington, DC The Architect of the Capitol Soft Ground 320' x 114"Ø
SUMMARY: Bradshaw jacked 320 feet of 96 inch reinforced concrete pipe for a coal conveyor tunnel under active CSX and Amtrak railroad tracks for Architect of the Capital in downtown Washington, DC. Bradshaw used an Akkerman Model BS96C digger shield (tunnel boring machine) to excavate the tunnel. Bradshaw also installed soldier pile and lagging supported pits for jacking and receiving shafts. The major... Complete Project Profile

  518 - New Ragged Mountain Dam

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LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling Drill and Blast Charlottesville, VA RWSA Rock 482' x 114"Ø
SUMMARY: As part of improvements to increase the capacity of the Ragged Mountain Dam in Charlottesville, VA a tunnel was built to convey primary spillway discharges and house the 36 inch diameter raw water intake pipe which will convey water from the reservoir to the existing treatment facilities near the University of Virginia campus. The 10-foot horseshoe shaped tunnel was 482-feet long. It was... Complete Project Profile

  490 - Little Patuxent Sewer Phase 3

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GEOLOGY

DIMENSIONS
Hand Tunneling Drill and Blast Savage, MD Howard County Rock 355' x 96" Ø
SUMMARY: Bradshaw Construction hand drilled and blasted a 96 inch tunnel, 355 linear feet in length, to accommodate a 42 inch FRP sanitary sewer. A combination of 96" horseshoe ribs and wood lagging, as well as rock bolts and wire mesh were used to support the seamy and blocky rock patterns. Rock samples showed rock with unconfined compressive strength greater than 55 KSI. There were noise... Complete Project Profile

  430 - Deep River Outfall Sewer

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SUB TYPE

LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling Drill and Blast High Point, NC City of High Point Rock 1,400' x 82" - 96" Ø
SUMMARY: This project involved the utilization of two tunneling methods: hand mine drill & blast, and a TBM capable of mining through hard rock conditions. For the most part the 1,000' TBM run was self-supporting, but some of the weaker zones required rock bolts, roof channels, and even liner-plates for a short reach. Two drill and blast road crossings totaling 400' were completed on this job. Both drill... Complete Project Profile

  546 - Myrtle / Morehead Storm Drainage Improvements, Phase 1

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LOCATION

OWNER

GEOLOGY

DIMENSIONS
Hand Tunneling NATM/SEM Charlotte, NC City of Charlotte Mixed Face 150' x 13" Ø
SUMMARY: Bradshaw constructed a 13’ horseshoe shaped tunnel 20’ under Morehead Street in downtown Charlotte, NC. The 150’ long was tunnel part of a storm drainage improvement project. The tunnel was designed & constructed using the sequential excavation method (SEM), a hand mine technique using reinforced shotcrete for initial tunnel support. Portions of the tunnel were in mixed face conditions... Complete Project Profile

  459 - Knight Theater Tunnels

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SUB TYPE

LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling NATM/SEM Charlotte, NC Wachovia Bank Mixed Face 160' x 13' x 16.5'
SUMMARY: Bradshaw Construction designed and built two 13' tall by 16.5' wide shotcrete horseshoe-shaped tunnels, totaling 160', for the city of Charlotte, NC. The tunnels were designed as initial/final shotcrete linings, with a sprayed water barrier between shotcrete layers. In addition, the mix design was supplemented with a cementitious admixture to develop internal water resistant properties in the... Complete Project Profile

  361 - Orme Street Combined Trunk Relief Sewer - Phase 3

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LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling NATM/SEM Atlanta, GA City of Atlanta Mixed Face 2,300' x 14' x 16'
SUMMARY: Bradshaw Construction Corporation built the first ever NATM tunnel that utilized compressed air in North America. The project involved the connection of two existing 7' diameter combined sewers to a new 12' diameter relief sewer. Connections were made at seven locations, along a 2,300' alignment in downtown Atlanta. The alignment was enveloped by adjacent structures and utilities. The project was... Complete Project Profile

  348 - R.M. Clayton WRC Plant Expansion - Phase 3

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SUB TYPE

LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling NATM/SEM Atlanta, GA City of Atlanta Rock 1000' x 16 ' x 16 '
SUMMARY: Bradshaw Construction Corporation drilled and blasted 1000' of rock, and partially weathered rock, in order to install a 12' diameter wastewater pipeline for the City of Atlanta. In order to complete this project in the most expedient manner, a "no blasting" clause in the contract was waived. With the utilization of blasting, we successfully mined through ground conditions that included coming... Complete Project Profile

  555 - DLCO Bates Street Tunnel (Carson Circuit)

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LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling Steel/Wood Pittsburg, PA City of Pittsburg Mixed Face 58' x 53" x 52"
SUMMARY: Bradshaw Construction Corp. has recently completed the installation of 58 linear feet of 48 inch wood box tunnel as part of Duquesne Light’s Carson Circuit Project in Pittsburgh, PA. The tunnel was hand mined under Bates Street in soil that consisted primarily of decomposed shale. Complete Project Profile

  539 - Liberty Heights Handmine

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GEOLOGY

DIMENSIONS
Hand Tunneling Steel/Wood Baltimore, MD City of Baltimore Rock 16' x 48" x 48"
SUMMARY: Bradshaw installed 16 linear feet of a 48 inch woodbox tunnel in rock under Hilton Street. The tunnel accommodated a new sewer line in a residential area of the City of Baltimore. Tunneling was preferred over open cut by both the owner and the general contractor due to the disturbance associated with open cut rock excavation. Complete Project Profile

  538 - Service Customer Built - DC-3rd & H Street, NW

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GEOLOGY

DIMENSIONS
Hand Tunneling Steel/Wood Washington, D.C. District of Columbia Soft Ground 16' x 48" x 48"
SUMMARY: Bradshaw installed approximately 16 feet of 48 inch woodbox tunnel and ductbank to connect an existing basement to an electrical vault in downtown Washington, DC. Tunneling was deemed a more suitable alternative to traditional trenching methods, because tunneling avoided disruption to road and pedestrian traffic, and eliminated the need to demolish and replace existing surface improvements. Complete Project Profile

  537 - Johns Hopkins Hospital Nelson Harvey Extension Enhancements, Wolfe Street

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GEOLOGY

DIMENSIONS
Hand Tunneling Steel/Wood Baltimore, MD Johns Hopkins Hospital Mixed Face 85' x 48" x 48"
SUMMARY: Bradshaw Construction was contracted to hand mine a 48 inch by 48 inch wood box tunnel to house a 10 inch polyvinyl chloride pipe and an 18 inch ductile iron pipe. Unanticipated rock was encountered during mining and was removed with pneumatic chisels and hammers. The tunnel was performed due to the close proximity of existing buildings and structures which did not allow for open cut... Complete Project Profile

  536 - Emergency Generator Replacement John Adams Building

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LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling Steel/Wood Washington D.C., The Architect of the Capitol Soft Ground 12' x 60" Ø
SUMMARY: Bradshaw installed 12 linear feet of a 60 inch liner plate tunnel in sandy material under a security wall footing at the John Adams Building in downtown Washington, DC. The tunnel allowed for the connection of a new stormwater management structure to an existing manhole, without disruption to surface features or pedestrian traffic. Complete Project Profile

  529 - McMillian Stormwater Storage

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SUB TYPE

LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling Steel/Wood Washington D.C., DCW Soft Ground 35' x 72"Ø
SUMMARY: Bradshaw Construction completed two shafts and a hand mine liner plate tunnel as part of a storm water overflow project in northwest Washington DC. As a result of flooding in the area, DC Water decided to convert a more than 100 year old sand filtration chamber into a storm water overflow basin. Bradshaw was subcontracted to install 28 vertical feet of 25 foot diameter shaft while working from... Complete Project Profile

  528 - Children's Hospital of Richmond Pavilion

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SUB TYPE

LOCATION

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GEOLOGY

DIMENSIONS
Hand Tunneling Steel/Wood Richmond, VA VCU-CHoRP Soft Ground 180' x 96"-132" Ø
SUMMARY: As part of a design/build project, Bradshaw Construction constructed two utility tunnels for the extension to the Children's Hospital of Richmond. Excavation for the first tunnel consisted of 132 inch diameter liner plate with 96 inch reinforced concrete pipe as final lining. The ground conditions were lean clays overlaid with gravely sand in the crown. The second tunnel was for 96 inch liner... Complete Project Profile

  522 - Holy Cross Hospital-Silver Spring-Phase 1B

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Hand Tunneling Steel/Wood Silver Spring, MD Holy Cross Hospital Rock 40' x 48" x 48"
SUMMARY: Bradshaw constructed a 48 inch by 48 inch (ID) wood box tunnel under the loading dock for the Holy Cross Hospital in Silver Spring. MD. The over all project was to expand the campus to include a new patient tower for 150 new private patient rooms, a four-level parking garage expansion to accommodate an additional 300 parking spaces, and the central utility plant serving the existing campus... Complete Project Profile

  498 - Lafayette Street Pedestrian Tunnel

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Hand Tunneling Steel/Wood Tallahassee, FL FDOT Soft Ground 55' x 144 " Ø
SUMMARY: Bradshaw Construction built a 55' long hand mine liner plate tunnel for Florida State University to prevent pedestrian overflow onto Lafayette Street after FSU football games. Bradshaw has a long history of building liner plate tunnels; what made this project unique was the active CSX railroad tracks only 6.5' overhead. Trains traveled over the tunnel many times per day during construction... Complete Project Profile

  486 - Kennesaw Pedestrian Tunnel

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Hand Tunneling Steel/Wood Kennesaw, GA Kennesaw Pedestrian Tunnel Soft Ground 115' x 13' Ø
SUMMARY: Bradshaw hand tunneled 7 feet under a busy CSX Railroad serving Atlanta, GA to install 115 feet of 13 foot diameter tunnel with only 5'-7' of cover between the tunnel and the tracks. The tunnel supports were steel liner plate lined with epoxy paint. It was part of a new park celebrating railroad history and provided a much needed pedestrian underpass. Compensation grouting and real-time... Complete Project Profile

  476 - Kirkwood Road Tunnels

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Hand Tunneling Steel/Wood Arlington, VA Dominion Power Mixed Face 276' x 48" x 48"
SUMMARY: Bradshaw Construction completed 276' of 48" x 48" hand-mined wood box tunnels for electrical conduit. The main challenges of the project were not known when the project began. The tunnels were supposed to be in soft ground, but partially complete with the first tunnel our crew encountered some hard rock. There was great difficulty in removing the rock for 25' of the tunnel without blasting or... Complete Project Profile

  471 - Suwanee Pedestrian Tunnel

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Hand Tunneling Steel/Wood Suwanee, GA City of Suwanee Soft Ground 62' x 156 " Ø
SUMMARY: Bradshaw Construction installed 62' of 156" steel liner plate tunnel by conventional hand mine methods through a railroad embankment for a pedestrian tunnel. Hand mine techniques were utilized to install the liner plate tunnel under an active Norfolk Southern Railroad with only 7' of cover. Mining took six days to complete, working around the clock. After completion of the excavation, a shotcrete... Complete Project Profile

  457 - Battery Park Trunk Sewer Tunnel

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Hand Tunneling Steel/Wood Richmond, VA City of Richmond Soft Ground 200' x 96" Ø
SUMMARY: As part of a new 3,400' by-pass sewer tunnel, Bradshaw also hand tunneled a total of 200’ of 96” liner plate for a 72” fiberglass storm sewer pipe. Each hand tunnel intersected the 144" rib and board tunnel for underground Y connections or was combined in three way manholes at the shafts. Just as for the primary by-pass tunnel, other major challenges were the extremely accelerated... Complete Project Profile

  443 - Route 262 CSX Crossing

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Hand Tunneling Steel/Wood Staunton, VA VDOT Rock 75' x 120" Ø
SUMMARY: Bradshaw Construction installed a 10'Ø Hand Mined Liner Plate tunnel under CSX Railroad in Staunton, Virginia. The tunnel was excavated from a portal through Boulder Fill in the embankment of the railroad. Due to the voids in the fill, a cementitious grout curtain was pumped over the tunnel alignment before mining. In order to mitigate the risks settlement and the danger of mining through... Complete Project Profile

  412 - Hillen/Ashburton Plant Bypass Pipeline

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Hand Tunneling Steel/Wood Baltimore, MD Baltimore City DPW Soft Ground 50' x 108" Ø
SUMMARY: Bradshaw hand mined 50 feet of 108 inch liner plate for a 66 inch PCCP sewer and an 8 inch DIP water main under the CSX Railroad. Ground conditions were residual soils of silts, sands and boulders and required hand mining techniques of face breasting and crown fore poling. Bradshaw also installed a 12’ x 24’ mining shaft. The key challenges were the boulder ground conditions, proximity to... Complete Project Profile

  405 - MD Route 32 Bridge Replacement

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Hand Tunneling Steel/Wood Sykesville, MD MD SHA Mixed Face 60' x 66"Ø
SUMMARY: Bradshaw Construction hand mined a 66 inch liner plate tunnel and installed a 48 inch reinforced concrete storm drain under a CSX Railroad. The removal of boulders during shaft and tunnel excavation required extreme care so as not to cause settlement of the railroad. Complete Project Profile

  482 - Dundalk Marine Terminal

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Pipe Rehab Sekisui SPR Baltimore, MD Honeywell, Inc. Soft Ground 8,552' x 15'-94" Ø
SUMMARY: Bradshaw Construction Corporation successfully rehabilitated 75 storm drains at the Dundalk Marine Terminal located in Baltimore, MD. This was the first time that Sekisui's SPR reline technology was used in a non-man-entry fashion in the US - highlighting our commitment to incorporating cutting edge technologies in our work. Sekisui SPR was used to rehabilitate the storm drains that ranged from... Complete Project Profile

  469 - Fanwood Storm Sewer Reconstruction

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Pipe Rehab Sekisui SPR Plainfield, NJ Borough of Fanwood N/A 1,000' x 72" Ø
SUMMARY: Bradshaw was contracted to rehabilitate a sewer pipe in a residential area by relining. The steel reinforced spiral wound lining was used for 264 linear feet of 66 inch and 1,000 linear feet of 72 inch corrugated metal pipes. This also included grouting in place. The greatest challenge of the project was working in a live storm sewer which required careful attention to the weather as bypass... Complete Project Profile

  564 - Arkendale-Powell's Creek Third Track Project

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Pipe Rehab Slip Lining Quantico, VA CSX Transportation, Inc. N/A 38' x 60"Ø
SUMMARY: Bradshaw completed an emergency slipline repair project for KC Constructors (Kiewit-Clark JV). During the construction of a new track for CSX railroad, supportive steel sheeting was driven through an existing 60 inch RCP storm drain, requiring corrective measures. KC Constructors subcontracted Bradshaw to diagnose and repair the damage. After an initial exploration, 50 linear feet of 54 inch FRP... Complete Project Profile

  454 - Claymount Avenue Sewer Repair

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Pipe Rehab Slip Lining Baltimore, MD Baltimore City Soft Ground 168' x 30" Ø
SUMMARY: Bradshaw Construction was contracted by Baltimore city to perform an emergency repair and rehabilitation of a collapsed brick sewer causing sewage back-up and flooding in a residential area. Bradshaw excavated down and removed the damaged portion along with the top of the sewer. Then, 30" PVC slip-lining pipe was inserted into the sewer and pushed along the existing pipeline. When the entire... Complete Project Profile

  446 - Indian Creek Sewer Rehabilitation

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Pipe Rehab Slip Lining Atlanta, GA City of Atlanta Rock 86" x 400'
SUMMARY: Bradshaw Construction was selected by USF&G Surety to rehab a gravity sewer that was improperly installed by Modern Continental Construction. Approximately 400' of the 36" DIP sewer had randomly floated above the design elevation when grout backfilled in tunnel. Bradshaw excavated access shafts, by-pass pumped the sewer, performed video surveys to determine the extent of floatation or... Complete Project Profile

  429 - Braddish Avenue Sewer Repair

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Pipe Rehab Slip Lining Baltimore, MD Baltimore City Rock 277' x 60"Ø
SUMMARY: Bradshaw Construction Corporation installed a 60 inch liner plate tunnel to accommodate for a reinforced concrete pipe and slip-lined an existing failing 33 inch Hobas sewer pipe as part of an emergency repair for the City of Baltimore. The shaft was constructed out of steel sheeting with dimensions of 18.5 feet wide x 30 feet long x 33 feet deep. Complete Project Profile

  544 - CIAC Water Project Segment 2, Phase 1: Rivercrossing

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Shaft Work Slip Lining Tampa, FL City of Tampa Mixed Face WSM 23' ID x 45' VF & Drilled 10' OD x 40' VF
SUMMARY: This microtunnel project was part of the Design/Build Capital Improvements Program for the City of Tampa. For future city growth, Bradshaw microtunneled a 60" x 482' steel casing under the Hillsborough River for a new 36" DIP water main. Two shafts were constructed: a 23' ID x 45' deep launch shaft at Julian B. Lane River Park and a 10' OD x 40' deep drilled receiving shaft at the Straz... Complete Project Profile

  324 - Cohas Brook Interceptor - Phase 1

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Shaft Work Concrete Caisson Manchester, NH City of Manchester Mixed Face 10' - 14' x 40VF - 60'VF
SUMMARY: As part of a microtunneling project Bradshaw installed two caissons: a 14’ ID x 40' deep jacking shaft and a 10' ID x 60' deep receiving shaft. They were constructed using precast concrete segments and fitted with steel cutting shoes. They were sunk under their own weight, by excavating the soil with a crane & clam bucket. The lower portions were excavated subaqueous and the bottom slabs were... Complete Project Profile

  1JV1 - East Bay/Calhoun Drainage Facilities Division I - Collection Tunnel System

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Shaft Work Concrete Caisson Charleston, SC City of Charleston Soft Ground 16' - 30 'Ø x 130VF - 150VF
SUMMARY: BTM Joint Venture, led by Bradshaw Construction, managed the construction of two (2) cast-in-place caisson shafts constructed in downtown Charleston, SC. The project was the first phase of flood control instituted by the City. The first caisson was 30’ ID x 150’ deep at Concord St and served as a tunnel mining shaft and future pump station. The second caisson was 16’ ID x 130’ deep in... Complete Project Profile

  540 - Improvements to Lower Gwynns Runs Interceptor, Phase II

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Shaft Work NATM/SEM Baltimore, MD City of Baltimore DPW Rock 4EA @ 24'x31VF, 42VF, 57VF &18VF, 16'x49VF, & 32'x27VF
SUMMARY: Bradshaw constructed six shafts in downtown Baltimore City for 2,553' of 36” gravity sewer installed in rock by TBM (gneiss up to 37,000 psi). In addition to providing tunnel access, the shafts were used to install new sewer manholes and connections to the existing system. The 16' & 24' diameter shafts (depths ranged from 18' to 57') were supported by steel ribs & wood lagging in the soft... Complete Project Profile

  457 - Battery Park Trunk Sewer Tunnel

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Shaft Work NATM/SEM Richmond, VA City of Richmond Soft Ground 30' Ø NATM + 30' Ø R&B + 20'x50' SP&L
SUMMARY: To resolve CSO flooding from a collapsed sewer for the City of Richmond, Bradshaw installed 4 tunnels from various drive and recovery shafts. These included the use of the New Austrian Tunnel Method (NATM – Sprayed reinforce shotcrete), steel sheet piling, steel rib and wood lagging, and trench box shafts. The all varied in depth up to 60’ deep. The NATM shafts were 30' ID. The structures... Complete Project Profile

  434 - Upper Jones Falls Interceptor Sewer - Phase 2

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Shaft Work NATM/SEM Baltimore, MD Baltimore City DPW Mixed Face 40' x 70' x 35VF
SUMMARY: As part of a 6,000 foot microtunnel sewer project, Bradshaw installed a 40’ wide x 70' long x 35’ deep elliptical shaft over an existing 42” sewer and manhole. This shaft was large enough to allow a gravity by-pass of the existing 42” sewer so a unique cross-over structure could be constructed to tie this existing sewer into the new microtunneled 48” sewer. The shaft was excavated by... Complete Project Profile

  419 - Nancy Creek Pump Station Shaft

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Shaft Work NATM/SEM Atlanta, GA City of Atlanta Mixed Face 72' Ø x 150VF
SUMMARY: The City of Atlanta awarded a design-build contract to Western Summit Constructors, Inc. (WSCI) to construct a 100 mgd, 160' deep pump station at the R.M. Clayton WWTP. WSCI hired Bradshaw/Frontier Kemper JV (BFK) to design, excavate and support the shaft for the pump station. Jenny Engineering designed the shaft for BFK. The shaft was 72' in diameter by 150 feet deep after site excavation. The... Complete Project Profile

  412 - Hillen/Ashburton Plant Bypass Pipeline

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Shaft Work NATM/SEM Baltimore, MD Baltimore City DPW Soft Ground 48'Ø x 40' Deep
SUMMARY: Bradshaw constructed a 48 foot ID x 40 feet deep shaft over an existing 96” sanitary sewer. Bradshaw used the New Austrian Tunneling Method (NATM) to install and support the shaft. The ground conditions were silt, sand (micaceous residual) soils with gneiss boulders. A cast in place concrete junction chamber was built in the shaft to tie in the existing sewer with a new 66” PCCP sewer... Complete Project Profile

  388 - Pentagon Metro Entrance Facility

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Shaft Work NATM/SEM Washington, DC Pentagon Renovation Office Soft Ground 34' Ø X 50VF
SUMMARY: The Metro Entrance Facility was a security-driven project designed to eliminate the direct entry to the Pentagon from the Metro tunnel and provide a secure screening facility for Pentagon visitors. As part of the project, a 50' deep elevator was constructed between the existing underground station and connecting to the existing escalator passage for handicap access. Bradshaw was selected to... Complete Project Profile

  308 - Fullerton Water Transmission Main Section I

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Shaft Work NATM/SEM Fullerton, MD Baltimore County DPW Soft Ground 73' x 42' x 35VF
SUMMARY: Bradshaw constructed an elliptical shaped shaft with the dimensions of 73 feet x 42 feet x 35 feet deep using the New Austrian Tunnel Method (NATM). The ground conditions were silt, sand and gravel. The shaft was used to install 1,700’ of TBM tunnel for an 84 inch steel water main and to construct a triple 84 inch butterfly valve vault. The principal challenge of the project was to install... Complete Project Profile

  552 - ODEC Wildcat Point Raw Water Supply

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Shaft Work Steel/Wood Peach Bottom, PA ODEC Rock 54' x 23'Ø
SUMMARY: ODEC’s Wildcat Point Generation Facility (WPGF) in Cecil County, MD will use water from the Conowingo Reservoir in Lancaster County, PA. The Wildcat Point Raw Water Supply Project, consisting of a pump house, wet well shaft and pipelines to convey water from the Susquehanna River to WPGF. The wet well shaft was constructed by Bradshaw to serve as both tunnel access and as the permanent intake... Complete Project Profile

  542 - AGY-Purple Line Plymouth Tunnel Test Shaft

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Shaft Work Steel/Wood Silver Spring, MD MTA Soft Ground 12'Ø x 33VF
SUMMARY: Bradshaw installed a 12 foot diameter rib and board shaft for geotechnical exploration and observation as part of the Maryland Transportation Authority's Purple Line project. The shaft was installed to a depth of 33 feet in sand, silt & decomposed rock, and then backfilled with flowable fill after a four day observation period. Bradshaw's work was completed in 20 working days (including... Complete Project Profile

  532 - South Platte Interceptor

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Shaft Work Steel/Wood Brighton, CO MWRD Mixed Face 204' x 24.5 - 25.5VF
SUMMARY: Bradshaw Construction was contracted to mine five microtunnel crossings on Metro PAR 1088. Crossings at 168th & 160th Avenues were jacked with 96 inch steel casing. Crossings for the South Platte River & E-470 are completed and utilized 78 inch steel casing. The ground conditions consist of sand, gravel, coarse alluvium, and cobbles below the groundwater table. The scope also includes several... Complete Project Profile

  529 - McMillian Stormwater Storage

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Shaft Work Steel/Wood Washington D.C., DCW Soft Ground 57'x12-46VF
SUMMARY: Bradshaw Construction completed two shafts and a hand mine liner plate tunnel as part of a storm water overflow project in northwest Washington DC. As a result of flooding in the area, DC Water decided to convert a more than 100 year old sand filtration chamber into a storm water overflow basin. Bradshaw was subcontracted to install 28 vertical feet of 25 foot diameter shaft while working from... Complete Project Profile

  521 - Crabtree Basin Waste Water Conveyance Phase 1

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Shaft Work Steel/Wood Raleigh, NC City of Raleigh Mixed Face 66'x24-40 VF
SUMMARY: Phase 1 of the Crabtree Basin Wastewater improvements project consisted of 21,000 feet of 30" to 72" diameter gravity sewer pipe. Three segments were designed for trenchless construction by microtunneling. These included two road crossings and one crossing under existing 60" RCP pipeline connected to an active pump station. Bradshaw microtunneled all three crossings in rock and mixed face soil... Complete Project Profile

  517 - I-83 Emergency Shaft

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Shaft Work Steel/Wood Baltimore, MD Baltimore City DOT Soft Ground 24' x 24VF
SUMMARY: Bradshaw Construction made emergency point utility repairs for 15 inch and 18 inch reinforced concrete in the median of I-83 in Baltimore, MD. A 24 foot, outer diameter, shaft which encompassed an active manhole was excavated and shored with steel liner plates to a depth of 24 feet. Bradshaw's scope included excavating and installing the shaft supports, replacing the broken pipes and... Complete Project Profile

  505 - Piney Branch Sewer Interceptor Upgrade - Phase 1

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Shaft Work Steel/Wood Waldorf, MD Charles County Soft Ground 12'-15' x 15'-30'
SUMMARY: As part of a 1,600 linear feet microtunnel sewer project, Bradshaw installed all the 5 drive shafts. Subsurface conditions included silt, clay, and sand with the tunnels well below the ground water table. Bradshaw used interlocking steel sheeting to install the water tight shafts ranging in depth from 18 to 23 feet. The primary challenges of this project were the limited access along lengthy... Complete Project Profile

  504 - Castleton Relief Sewer Project-Phase 1

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Shaft Work Steel/Wood Indianapolis, IN Citizens Energy Group Mixed Face 16' x 20' Ø
SUMMARY: Bradshaw Construction installed 2,740 linear feet of 42 inch reinforced concrete pipe for a relief sanitary sewer by microtunneling through sand with cobbles and boulders below the groundwater table at an average depth of 20 feet. The microtunneling was accomplished in four drives, the longest of which was 810 feet. Six access shafts were constructed using steel ribs and liner plates (16 feet... Complete Project Profile

  480 - Belmont North Relief Interceptor - Section 1

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Shaft Work Steel/Wood Indianapolis, IN City of Indianapolis Mixed Face 26' to 43' Ø
SUMMARY: Bradshaw Construction installed 5,200' of 72" reinforced concrete pipe for a sanitary sewer relief interceptor. 4,000' of pipe was installed by microtunneling through sand with cobbles and boulders and glacial till below the groundwater table at an average depth of 30'. The microtunneling was accomplished in six segments, the longest being 1,150' long using three intermediate jacking stations... Complete Project Profile

  478 - National Center Sanitary Sewer Project

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Shaft Work Steel/Wood Crystal City, VA Arlington County Mixed Face 26'Ø x 30VF
SUMMARY: The primary jacking pit on the NCSS project was a 30' deep, 26' diameter shaft supported by steel ribs and wood lagging. The shaft was installed in primarily sandy, dry conditions with interspersed layers of hard clay. One of the main challenges involved in the shaft installation was the presence of a manhole intersecting the shaft. The manhole remained from a previous drilled shaft... Complete Project Profile

  432 - Irwin Creek Relief Sewers Phase 2

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Shaft Work Steel/Wood Charlotte, NC Charlotte-Mecklenburg Mixed Face 50' x 15' x 26VF & 12'-26' x 24VF-42VF
SUMMARY: Bradshaw constructed 23 shafts that were 20 to 50 feet in depth of soldier pile and wood lagging. Rib and board was used above the water table and liner plate for below. 4700 linear feet of 60-102 inch tunnels for 36 inch and 54 inch ductile iron pipe. 900-1300 linear feet included curves by tunnel boring machine with liner plate under NSR Railroad. Drill & Blast. Complete Project Profile

  398 - US Capital Coal Handling System

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Shaft Work Steel/Wood Washington, DC The Architect of the Capitol Soft Ground 31' x 32' x 30VF & 27' x 29' x 25VF
SUMMARY: Bradshaw installed soldier pile and wood lagging supported pits for jacking drive and receiving shafts necessary to jack 320’ x 96” RCP coal conveyor tunnel. The jacking drive shaft was 31’ x 32’ x 30’ deep and the receiving shaft was 27’ x 29’ x 25’ deep. The major challenge was installing both shafts in close proximity to the existing coal transfer plant facilities and the... Complete Project Profile