Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  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

  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

  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

  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

  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

  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