Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  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

  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

  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" steel casing under the Hillsborough River for a new 36" DIP water main. Two shafts were constructed: a 23' ID launch at Julian B. Lane River Park and a 10' OD receiving shaft at the Straz Performing Arts Center. The water main was... 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 seperate 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 190 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