METHOD OF AND AN APPARATUS FOR PRODUCING IN-SITU CONCRETED PILES WITH ENLARGED BASES

摘要

ABSTRACT OF THE DISCLOSUREThe invention relates to a method of and an apparatusfor producing in-situ concrete piles with enlarged bases.This method consists in driving into the ground atube provided at its lower end with a shoewhich is larger than the diameter of the tube , and withan outer casing attached around its lower portion, infilling fresh concrete into the gap between the tubeand the soil as fast as the opening is formed,in expelling the shoe and the plug to form theenlarged base and in extracting the tube together withthe outer casing .This invention relates to the construction of concre-te piles into the ground.