PILE HOLE DIGGING DEVICE AND PILE HOLE DIGGING CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To dig a pile hole having a diameter expanded part by a simple configuration.;SOLUTION: A sliding shaft 33 is slidably attached along a rotary digging shaft 31 provided with a cutter 32 in a lower end part, and an auxiliary cutter 34 protruding on a side of the cutter 32 and turnable in substantially vertical face so that it is stored above the cutter 32 is provided. The sliding shaft 33 and the auxiliary cutter 34 are mutually connected by a link mechanism 35, and the sliding shaft 33 rises for the rotary digging shaft 31 to protrude the auxiliary cutter 34 from the side of the cutter 32. The auxiliary cutter 34 has a peripheral face cutter part 341 whose sideway protrusion amount becomes large gradually when going downward in a condition in which it protrudes on the side of the cutter 32 to dig a peripheral face of the pile hole and expand diameter and a lower face cutter part 342 digging a lower face of the diameter expanded part dug by the peripheral face cutter part. A peripheral face of the pile hole is dug by the auxiliary cutter 34 protruding on the side of the cutter 32 to expand diameter in a conical shape and dig a lower face of the diameter expanded part simultaneously.;COPYRIGHT: (C)2005,JPO&NCIPI