Foundation Underpinning using Helical Pile

Foundation underpinning using helical pile is a method where steel screw-like piles are installed deep into the ground to support a settling structure. The process begins with excavation around the existing foundation roughly about 2'x2'x2' exposing the bottom of existing foundation then the helical piles are then screwed into the ground using hydraulic machinery until they reach stable soil and the gauge records the specified torque per the engineering specification. Steel brackets are attached to the foundation using two anchor bolts epoxy doweled to existing foundation and resting on top of helical pile shaft, other method is to create a rebar cage with concrete haunch incorporating the helical pile shaft with two rebars drilled through the shaft of the helical pile and casting the concrete haunch. The load of the building is transferred through the helical piles to competent soil strata underneath making the house supported properly. This type of underpinning method offers immediate support, requires minimal disruption, and works well in areas with poor soil conditions. It’s quicker and less invasive than traditional underpinning techniques using drilled piers and concrete haunches and more efficient than push piles etc.