Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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

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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

  530 - Manchester Creek Outfall, Phase II

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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

  479 - Appalachian State Steam Tunnel

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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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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

  489 - 30th Avenue North Storm Water Improvements

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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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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

  516 - 11th Street Corridor CSO Diversion

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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

  398 - US Capitol Coal Handling System

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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