Microtunneling Bradshaw Company Maryland TUNNELING SPECIALISTS SINCE 1963      
 

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  445 - BWI Stage 3B 20" Transmission Line

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Microtunneling Pilot Tube Baltimore, MD Southwest Airlines, Inc. Soft Ground 880' x 30" Ø
SUMMARY: Bradshaw Construction installed 880 linear feet of 30 inch Permalok steel casing at Baltimore Washington International (BWI) airport in 3 drives under a railroad and 2 highways using the Akkerman pilot tube guided boring method. The ground conditions were extremely dense silt and sand with occasional stiff clays. Shafts for the drives were supported by steel sheeting, trench boxes as well as... Complete Project Profile

  424 - Locust Point Interceptor

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Microtunneling Pilot Tube Baltimore, MD City of Baltimore Soft Ground 240' x 10" Ø
SUMMARY: Bradshaw Construction installed 240 linear feet of 6" vitrified clay pipe sewer using an Akkerman GBM-240 “pilot tube” guided boring system. The ground conditions were silt, sand, gravel and rubble fill. The Akkerman GBM system pipe jacks in three passes (pilot tube, cased augers, and product pipe) for installation typically to +/-1 inch of design alignment and elevation. The pilot tube... Complete Project Profile

  472 - Sewer Improvements at Fenwick Road and Essex Avenue

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Microtunneling Pilot Tube Fairfax County, VA Fairfax County DPWES Soft Ground 1,800' x 16" Ø
SUMMARY: Bradshaw Construction installed 1,800' of 12" vitrified clay pipe to increase sewer capacity in two neighborhoods in Fairfax County, VA. The line was installed by pilot tube microtunneling through clay, silt, and sand. Due to some cobbles that were encountered, and several existing utilities, Bradshaw was required to perform some of the sewer installation by Open-Cut. There was also a previously... Complete Project Profile