| 摘要 |
PROBLEM TO BE SOLVED: To provide a bucket for diameter enlarging excavation, capable of reducing number of lift of the bucket for discharging excavated materials an excavation method for a middle enlarged diameter part, and an excavation method capable of forming the middle enlarged diameter part and the enlarged bottom part of a pile hole. SOLUTION: A diameter enlarged part 56 is formed in a vertical hole 20 by extending or contracting a blade enlarging part 30 provided on a rotary shaft 24 suspended from an excavator main body 16. A pan 96 and a bucket-like vessel 105 are interchangeably attached to a lower end part of the rotary shaft 24 by a connection means 98. When forming a lower part of the diameter enlarged part 56, the pan 96 is attached to the lower end part of the rotary shaft 24 to attach an arm part 34. Consequently, the lower part of 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
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