Tieback Project a Job for Sonic Drilling

Aquifer Drilling & Testing Inc. (ADT), a subsidiary of Cascade, takes to the water again! Specializing in over-water drilling, the team recently started on a project installing tiebacks via a barge located only a couple feet from the shoreline. 

Used as part of new construction or for remediation, tieback anchors are a construction element that actively applies tensile forces to existing structures. Typically constructed out of strands of cable or reinforcing bar grouted into the soil, tiebacks always contain a bond breaker (unbounded length) in the first 10 to 15 feet to ensure the load is transferred deep enough into the soil and to provide an adequate amount of free stressing length. The unbounded length can be increased depending on the design requirements. Tiebacks are typically installed at 15 to 45 degrees below horizontal, and can be permanent or temporary depending on their application.