Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  519 - DCW M Street Diversion Sewers

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DIMENSIONS
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

  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

  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

  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

  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

  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

  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

  273 - Ruby Avenue Storm Sewer Extension

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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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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

  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

  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

  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

  308 - Fullerton Water Transmission Main Section I

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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

  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

  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

  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

  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

  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

  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

  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

  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