3 1/2" Helical piles were installed on a new commercial building to allowing the structure to withstand seismic loading. Some of the piers were installed to 15,000 Ft lb of torque allowing them to resist over 100,000 lbs of force each. A total of 38 piers were installed at this location
Four 350 Helical Piers Fernely, NV
This picture shows four 3 1/2" helical piers installed in a spread footing to resist seismic loads.