Construction Technology of Full Casing Rotary Drilling and Pulling Pile

The construction technology of full-sleeve rotary drilling and pulling pile is to insert the long steel casing into the waste pile from the top of the pile, drill to the bottom of the waste pile by high-pressure water jet and gas circulation drilling, and then open the hydraulic pick in the bottom of the casing. Enclose the entire waste pile in the steel casing from the bottom of the pile; start the lifting system to lift the steel casing that intercepts the waste pile to the ground, and break the old pile on the ground; at the same time, remove the casing from the casing while lifting the casing Cement slurry is injected at the bottom, so that the pile hole after pulling the pile is properly reinforced by the cement slurry to prevent the mud strength in the pile hole from being too low and causing adverse effects on the subsequent construction. Based on this, this paper analyzes the construction technology of the wholecasing rotary drilling and pile pulling with an engineering example, in order to provide a reference for similar engineering applications.