Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

       SORT BY                 PROJECT NUMBER      |      LOCATION    

  518 - New Ragged Mountain Dam

PROJECT TYPE

SUB TYPE

LOCATION

OWNER

GEOLOGY

DIMENSIONS
Hand Tunneling Drill and Blast Charlottesville, VA RWSA Rock 482' x 114"Ø
SUMMARY: As part of improvements to increase the capacity of the Ragged Mountain Dam in Charlottesville, VA a tunnel was built to convey primary spillway discharges and house the 36 inch diameter raw water intake pipe which will convey water from the reservoir to the existing treatment facilities near the University of Virginia campus. The 10-foot horseshoe shaped tunnel was 482-feet long. It was... Complete Project Profile

  430 - Deep River Outfall Sewer

PROJECT TYPE

SUB TYPE

LOCATION

OWNER

GEOLOGY

DIMENSIONS
Hand Tunneling Drill and Blast 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

  490 - Little Patuxent Sewer Phase 3

PROJECT TYPE

SUB TYPE

LOCATION

OWNER

GEOLOGY

DIMENSIONS
Hand Tunneling Drill and Blast Savage, MD Howard County Rock 355' x 96" Ø
SUMMARY: Bradshaw Construction hand drilled and blasted a 96 inch tunnel, 355 linear feet in length, to accommodate a 42 inch FRP sanitary sewer. A combination of 96" horseshoe ribs and wood lagging, as well as rock bolts and wire mesh were used to support the seamy and blocky rock patterns. Rock samples showed rock with unconfined compressive strength greater than 55 KSI. There were noise... Complete Project Profile