A tieback is a structural element installed in soil or rock to transfer applied tensile load into the ground. Typically, a tieback is used along with other retaining systems (e.g. soldier piles) to provide additional stability to cantilevered retaining walls. With one end of the tieback secured to the wall, the other end is anchored into the earth. The tieback structure resists forces that would otherwise cause the wall to lean.
Tiebacks can be constructed as steel wires or rods, and are drilled into soil using a small diameter shaft. They are usually installed at an angle of 15 to 45 degrees. The tieback can either be drilled directly into a soldier pile, or through a wale installed between consecutive piles. After inserting the tiebacks into the ground, grout is pumped under pressure into the tieback anchor holes to increase soil resistance. This prevents the tiebacks from pulling out, reducing the risk for wall destabilization.
