A.H. Beck installs 43 drilled shafts penetrating limestone up to 50 feet for the new Chickamauga Lock in Chattanooga, Tennessee.
The new 110-foot by 600-foot Chickamauga Lock, designed and constructed by the U.S. Army Corps of Engineers Nashville District, will replace the existing lock, improve locking efficiency. A H Beck is working with AECOM and installing 43 drilled shafts, 54” and 78” diameter with depth up to 50 ft penetrating into limestone with varying degrees of fractures. AHB performed this work with a proprietary system utilizing reverse circulation drilling with down hole cluster drill hammers. This unique process allowed the rock sockets to be installed faster than conventional methods. All work was performed within the temporary coffer cell located next to the existing lock in the Tennessee River.