With Kelly piles, soil excavation is carried out with the drilling tool (short auger, drilling bucket ...) mounted at the tip of a telescopic bar. When tubing is used, the tube is clamped using the hydraulic system of the drilling equipment, and it is lowered by rotating simultaneously in the borehole.

The concrete is poured through a hopper pipe slid into the casing to the final depth reached, the tube being the last step.