Foundation Test Group, Inc. has been involved with the engineering, inspection and testing for the many facets of the drilled shaft foundation elements that will support the rebuild of BGE's two existing single-circuit 115 kV transmission lines crossing Bush River on the Perryman to Edgewood line. The existing lattice structures will be replaced with double-circuit steel monopole structures.

Precision Drilling is constructing the shafts using polymer slurry.

Shafts range from 8 feet to 12 feet in diameter and 30 feet to 50 feet in length. A corrugated steel pipe is set in the top of the shaft and the annulus between it and the soil is grouted in place. Concrete is placed via the tremie method while slurry is displaced. Steel anchor bolts extend through and above the top of the shaft to serve as the connection between the drilled shaft foundation and the steel monopole structure.

FTG is performing inspection of shaft installation and testing of concrete and grout.

FTG is also performing integrity testing on  every shaft using Thermal Integrity Profiling (TIP) methods to ensure that each shaft has uniform, good-quality concrete, and a concentric reinforcing steel placement. Slump loss tests have also been performed in order to ensure the workability of concrete will remain sufficient for the duration of tremie placement.

For more information on our testing services, Contact Us.