The project consists of 33 drilled shafts 84” in diameter with depths between 92 and 126 feet. Twelve of the shafts on the project are located in the Intercoastal Waterway. The extremely sandy subsurface conditions combined with the presence of many organics make it a challenging slurry displaced drilling project. By using a “stretch” drilling attachment, the American 9299 mounted attachment is able to reach drilled shaft locations up to 47’ away from the machine’s center pin. This allowed the contractor more flexibility in designing and building trestle access to the bent locations in the waterway.
GENERAL CONTRACTOR: Cape Romain Contractors, Inc.
ENGINEERING AND INSPECTION: Wilber Smith Associates
OWNER: South Carolina Department of Transportation