Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  498 - Lafayette Street Pedestrian Tunnel

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Hand Tunneling Steel/Wood Tallahassee, FL FDOT Soft Ground 57' x 144 " Ø
SUMMARY: Bradshaw Construction built a 57' long hand mine liner plate tunnel for Florida State University to prevent pedestrian overflow onto Lafayette Street after FSU football games. Bradshaw has a long history of building liner plate tunnels; what made this project unique was the active railroad tracks only 6.5' overhead. Trains traveled over the tunnel many times per day during construction. Carrier... Complete Project Profile

  471 - Suwanee Pedestrian Tunnel

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Hand Tunneling Steel/Wood Suwanee, GA City of Suwanee Soft Ground 62' x 156 " Ø
SUMMARY: Bradshaw Construction installed 62' of 156" steel liner plate tunnel by conventional hand mine methods through a railroad embankment for a pedestrian tunnel. Hand mine techniques were utilized to install the liner plate tunnel under an active Norfolk Southern Railroad with only 7' of cover. Mining took six days to complete, working around the clock. After completion of the excavation, a shotcrete... Complete Project Profile

  459 - Knight Theater Tunnels

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Hand Tunneling NATM/SEM Charlotte, NC Wachovia Bank Soft Ground, Mixed Face 160' x 13' x 16.5'
SUMMARY: Bradshaw Construction designed and built two 13' tall by 16.5' wide shotcrete horseshoe-shaped tunnels, totaling 160', for the city of Charlotte, NC. The tunnels were designed as initial/final shotcrete linings, with a sprayed water barrier between shotcrete layers. In addition, the mix design was supplemented with a cementitious admixture to develop internal water resistant properties in the... Complete Project Profile

  443 - Route 262 CSX Crossing

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Hand Tunneling Steel/Wood Staunton, VA VDOT Boulder Fill 75' x 120" Ø
SUMMARY: Bradshaw Construction installed a 10'Ø Hand Mined Liner Plate tunnel under CSX Railroad in Staunton, Virginia. The tunnel was excavated from a portal through Boulder Fill in the embankment of the railroad. Due to the voids in the fill, a cementitious grout curtain was pumped over the tunnel alignment before mining. In order to mitigate the risks settlement and the danger of mining through... Complete Project Profile

  430 - Deep River Outfall Sewer

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Hand Tunneling Drill and Blast High Point, NC City of High Point Rock 1,400'x82-96" 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

  361 - Orme Street Combined Trunk Relief Sewer - Phase 3

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Hand Tunneling NATM/SEM Atlanta, GA City of Atlanta Rock, Soft Ground 2,300' x 14' x 16'
SUMMARY: Bradshaw Construction Corporation built the first ever NATM tunnel that utilized compressed air in North America. The project involved the connection of two existing 7' diameter combined sewers to a new 12' diameter relief sewer. Connections were made at seven locations, along a 2,300' alignment in downtown Atlanta. The alignment was enveloped by adjacent structures and utilities. The project was... Complete Project Profile

  348 - R.M. Clayton WRC Plant Expansion - Phase 3

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Hand Tunneling NATM/SEM Atlanta, GA City of Atlanta Rock 1000' x 16 ' x 16 '
SUMMARY: Bradshaw Construction Corporation drilled and blasted 1000' of rock, and partially weathered rock, in order to install a 12' diameter wastewater pipeline for the City of Atlanta. In order to complete this project in the most expedient manner, a "no blasting" clause in the contract was waived. With the utilization of blasting, we successfully mined through ground conditions that included coming... Complete Project Profile