Bored piers; Also, commonly referred to as bored piles, drilled piers, drilled shafts, caissons, Cast-in-drilled-hole piles (CIDH piles) or Cast-in-Situ piles, are a non-displacement deep foundation method whereby deep holes are drilled in the earth for constructing concrete cylindrical foundations mainly to transfer the load of a building to the subsurface layers of the earth at different depths.