DRILLING CASING AND PILE SYSTEM

摘要

A drilling casing and pile system are provided to form the bulb of a foundation pile supporting a structure on the ground without driving a separate pretensioned spun high strength concrete (PHC) pile into the ground. A drilling casing(10) comprises a guide shoe(11), which is coupled to a lower end of the casing coupled with drilling equipment, prevents soil and sand from entering in an inward direction during drilling, and can be separated from the casing after drilled. A nozzle assembly(30) has a plurality of nozzles(31), which communicate with the casing and discharge cement milk to the ground during drilling the ground, on an outer circumference of the guide shoe at a lower end of the casing. Agitator blades(20) are installed at a lower part of the casing so as to directly agitate the cement milk fed from the nozzle assembly and the ground to form a bulb under the ground. The guide shoe includes a protrusion(13) fitted into recess(12) formed in a lower inner circumference of the casing.