A.H. Beck uses a crane attached drill rig to install diameter shafts while allowing US-17 to remain open to traffic over the Brunswick River in Brunswick County, North Carolina.
This is a two phase project to replace an existing bridge on US-17 over the Brunswick River. A busy highway had to remain open raising the challenges of working in between the existing spans and working from a combination of trestles and barges. A. H. Beck used a crane attached drill rig to drill and install the 40 – 84” diameter shafts to depths of 111 ft. to 130 ft. The project was value engineered to shorten the shafts from a design depth of 180 feet by the use of shaft base post grouting. The shafts were installed through sands, clays and limestone and were constructed with a permanent steel casing at the top and were stabilized with bentonite slurry during the excavation.
