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By “pulling down” a special flowable grout as the foundation is screwed into the soil, the result is a pile with both a friction-bearing central shaft and end-bearing helical plates in competent substrata.
Shaft and helical bearing plate sizes available are shown in Appendix A. Shaft sections may be fabricated in various lengths ranging from 36” to 240” depending on job requirements.
The capacity of a helical anchor/pile is dependent on the strength of the soil, the projected area of the helix plate(s), and the depth of the helix plate(s) below grade.
Helical Pile: Consists of a central shaft with one or more helix-shaped bearing plates and a load transfer device (bracket) that allows attachment to structures.
The bearing capacity provided by the helical plates for uplift is the same as for compression and is calculated through the summation of all individual helical plate’s capacities:
Mar 1, 2025 · MAGNUM®’s patented dual-cutting-edge (DCE) helix out performs standard circular helical bearing plates in difficult soil and bedrock conditions. The DCE helix offers a truer installation, tracks better, cuts through difficult soils. It will …
Helix Plate – A round plate formed into a ramped spiral. When rotated into the soil, the helical shape provides thrust along its longitudinal axis thus aiding in pile installation. After installation, the plate transfers axial load into the soil through bearing.
5.1.1 Hollow round shaft helical piles shall be used to resist compression loads. Round shaft helical piles are generally more resistant to bending or buckling over solid square shaft counterparts due to superior cross-sectional properties and coupling details.
Project descriptionThis example presents a detailed example for calculating the ultimate axial capacity of a helical pile according to Vesic 1974 and Meyerhoff/Hansen method.
Calculating bearing capacity is used to determine the number and diameter of helical bearing plates and the strength of shaft required to support the intended design loads.
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