BREAKING AND REMOVAL DEVICE FOR EXISTING PILE, AND BREAKING AND REMOVAL METHOD OF EXISTING PILE

摘要

PROBLEM TO BE SOLVED: To provide a breaking and removal device for an existing pile and a breaking and removal method of the existing pile, capable of facilitating removal of a joint part of the pile such as an iron plate, reducing material costs, shortening a work time, and easily and entirely removing the pile.;SOLUTION: A pile 1 installed in a ground is removed by an auger method in which an auger screw 13 with an auger head 12 at the tip thereof in an inside and a casing 11 in an outside are rotated in the mutually opposite rotating directions to excavate the ground. The casing 11 has, on its inner peripheral surface, a plurality of lower stage cutters 22a, 22b and upper stage cutters 23a, 23b projecting toward a center axis of the casing so that the outer periphery of the pile 1 is cuttable when the casing 11 is inserted into the ground around the pile 1. The lower stage cutters 22a, 22b and the upper stage cutters 23a, 23b are provided at positions having distances from the tip of the casing 11 respectively different, such that the extrusion amount of the cutter from the inner peripheral surface increases from the tip side of the casing 11 toward the rear end side.;COPYRIGHT: (C)2013,JPO&INPIT