Nova Scotia Power – Transmission Tower Foundations Cased Injection Bore (IBO) Micro-Pile System
Nova Scotia Power required an emergency repair to three failed transmission towers that would require the installation of a piling system that could penetrate deeply into slate bedrock and provide a pipe casing protruding above the ground surface to connect the new support frame to. This repair would be further complicated by its remote location, poor access and no availability to water or any utilities.
A Cased Injection Bore Micro-Pile (IBO) was chosen for the piling system that consisted of continuously threaded, hollow steel bar equipped with a disposable bit that was drilled into the slate bedrock using an excavator mounted rotary percussion drill. Grout was simultaneously injected through the hollow bar to flush out drills spoils and consolidate the surrounding soil or fractured bedrock. This technology was further enhanced by our AMCON Patented Casing System that encased the top portion of the pile with a steel pipe to provide lateral support and a connection for the support frame. This technology proved to be a fast and economical piling system that could be employed in a remote location with no utilities.