Helical Anchors (also referred to as tiebacks) provide lateral stability to foundation walls and retaining walls with unbalanced earth pressures. The anchors can be installed in almost any application because they can be installed with hand-held equipment, mini-excavators, skid steers, backhoes, trackhoes, or crane-supported rigs. This flexibility, along with the ability to immediately load and test the anchors, make helicals a convenient and economical solution for a wide variety of projects.
Helical anchors are a factory-manufactured steel foundation system consisting of a central shaft with one or more helix-shaped bearing plates, commonly referred to as blades, welded to the lead section. Extension shafts, with or without additional helix plates, are used to extend the anchor into competent load-bearing soils. Torque is applied to advance (screw) helical anchors into the ground.
Helical piles, screw piles, helical piers, helical anchors, helix piers, and helix anchors are terms often used interchangeably by specifiers. However, the term “pier” more often refers to a helical foundation system loaded in axial compression, while the term “anchor” more often refers to a helical foundation system loaded in axial tension.
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