BUCKET FOR DIAMETER ENLARGING EXCAVATION, EXCAVATION METHOD FOR MIDDLE ENLARGED DIAMETER PART, AND EXCAVATION METHOD FOR ENLARGED BOTTOM PART

摘要

PROBLEM TO BE SOLVED: To provide a bucket for diameter enlarging excavation, an excavation method for a middle enlarged diameter part, and an excavation method for an enlarged bottom part for forming the middle enlarged diameter part or the enlarged bottom part of a pile hole and discharging the dug soil onto the ground.;SOLUTION: A diameter enlarged part 56 is formed in a vertical hole 20 by expanding or contracting a blade enlarging part 30 provided on a rotary shaft 24 suspended from an excavator body 16. An arm part 34 is detachably attached to a lower end part of the blade enlarging part 30, and a bucket-like vessel 96 is detachably attached to a lower end part of the rotary shaft 24. A side wall of the bucket-like vessel 96 can be set and changed to a position having first height X₁ where an opened face is positioned at a lower end of the arm part 34 or a position having second height X₂ where the opened face is positioned at a lower end of the blade enlarging part 30. Consequently, the diameter enlarged part 56 can be formed by the arm part 34, and the number of elevation of the bucket for diameter enlarging excavation for discharging the dug soil onto the ground can be reduced.;COPYRIGHT: (C)2009,JPO&INPIT