- Company: Bradshaw Construction Corporation
- Industry: Water/Wastewater
- Location: White Marsh, Maryland
- Expected Completion Date: August 21, 2012
- Project Website
Bradshaw Construction Corp installed 468 feet of 87.5″ steel casing under I-95 (8 lane highway) near Baltimore, MD as part of the Express Toll Lane Project. The casing was installed via microtunneling with a RASA DH1900 MTBM in sand, silt, and clay below the water table, and at a depth of 20+/- feet below the busy highway. The casing was installed to house a new 54″ concrete sewer pipe which was also installed by Bradshaw.
What impact does this project have on America?
Microtunneling allowed this the new sewer line to be installed safely and accurately without disturbance to this heavily traveled segment of the I-95 corridor. In addition, the line was installed near a White Marsh Run, an stream that feeds directly into the Chesapeake Bay. Microtunneling also helped to limit the disturbance to White Marsh Run, because the disturbed area was much smaller than it would have been in comparison to traditional open trench methods.
What dangers and risks did you encounter, and describe any extraordinary methods used to keep workers safe?
The main risk on this project was over excavation leading to a sinkhole in the highway above. We mitigated that risk by working 24/7 and by carefully monitoring our mining pressures and advancement rates.
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