Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

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

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Shaft Work NATM/SEM 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

  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

  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

  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