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Tie-Back Anchors: Helical Tie-Back Anchors

August 21st, 2015 by

Helical tie-back anchors are a bearing-type anchor used to transfer tensile loads to suitable load-bearing soils. Helical tie-back anchors consist of a corrosion-protected central steel shaft of varying diameters, spiral helix bearing plates (size and number of plates varies depending on design load and soil conditions), and a wall connection. Their load capacity is proportional to the rotation or torque required during installation. This relationship is in accordance with the equation Qt = TKt where Qt is the total tensile load to be resisted including a factor of safety, T = installation torque and Kt is an empirical constant which varies between 3 and 20 and is a function or geometry of the central steel shaft.