HFDarling will provide the deep-foundation system most suited to your project:
Driven piles are most commonly installed from a crane with the downward force provided by a diesel or vibratory hammer. The piles can be H-beams, pipe piles, timber piles, or formed sheeting.
Caissons (or drilled shafts) are drilled foundation elements typically constructed by advancing a 24-inch to 96-inch diameter temporary casing through unconsolidated earth. Then, when necessary, advancing an open borehole through rock. Usually rebar cages are installed to provide additional strength to the caisson.
Micropiles are also drilled foundation elements but incorporate 4-inch to 12-inch diameter casing, often left in place permanently. Micropiles typically incorporate a single piece of threaded steel reinforcing bar.
Helical piles (or screw piles) consist of steel shafts with 6-inch to 18-inch diameter helixes spaced along the lead shaft. The helical pile is screwed into earth to provide both compressive and uplift loads. Helical piles will not penetrate rock, but they can be fast and economical to install in appropriate earth conditions.
Continuous-flight auger (CFA, or auger cast) piles are built with a long, continuous flight of hollow stem auger that evacuates the earthen drill cuttings on the outside of the auger and allows pumped concrete down the center of the hollow auger to simultaneously fill the borehole void with concrete as the cuttings are removed. Steel reinforcing is placed in the drilled hole while the concrete is still liquid.