Helical Tiebacks

Foundation Supportworks' offers two sizes of rounded-corner, solid square bar shafts to meet various load and installation requirements, 1.5" and 1.75". Tiebacks can also be made from hollow round shaft, but solid square shafts are more common due to their socket-and-pin style connection, which is quicker and easier to connect, and their ability to penetrate further into the soil with a similar amount of installation torque.

The end of the shaft is typically coupled to an adapter which transitions the square bar shaft to an all-thread rod. A steel plate or waler is often attached to the thread rod to transfer the load from the structure to the tieback.

Helical tiebacks are manufactured with similar helix plate sizes and helix spacing as helical piles that are installed vertically to support foundation loads. Tiebacks differ primarily from helical piles in that they are typically installed in a horizontal-to-45-degree downward orientation to laterally support the tops of earth-retaining structures.

Click HERE for the appropriate section of the Foundation Supportworks Technical Manual.