Drilco Services – Drilled Displacement Piles
Drilled displacement piles (DDP) refers to a specialized technology in which a bored pile is constructed using a process in which a specially designed tool is advanced into the ground using both rotation and downward thrust (“crowd force”) to displace the in situ soil radially outward into the surrounding formation. Concrete is injected and steel reinforcement (if required) is inserted to fill the created hole and provide structural stiffness.
DDP has been used as structural foundation elements (e.g., support column loading) and for ground improvement (e.g., column-supported embankments) on both commercial and public work type projects. The maximum diameter and depth that can be achieved are directly related to the capability of the drill rig used to construct the DDP. Almost no spoils are generated in drilling, making it work very well in contaminated soil.