Helical piles are factory-manufactured steel deep foundation elements used to penetrate weaker or otherwise unsuitable near-surface material for end-bearing within deep competent soils. The most common solid square and hollow round shaft sizes have outer dimensions generally less than five inches. These piles can be advanced with smaller installation equipment, yet can achieve torque-correlated allowable capacities up to about 65 kips. However, when slender helical piles are advanced through loose, soft, or fluid soils, buckling analyses are considered, which may result in either down-rating the pile capacity and requiring more piles, or upsizing to a larger shaft diameter that can support the design working loads.
The Helicast™ Grouted Helical Pile System generates capacity as a combination of end-bearing and skin friction and may be considered to address a buckling concern or for its other potential benefits.
For more information about helical piles and the Helicast™ Grouted Helical Pile System, view our Technical Manual and Supplemental Materials in the Technical Information section.