CONSTRUCTION MACHINE FOR EXCAVATING DEEP FOUNDATION

摘要

PROBLEM TO BE SOLVED: To provide a construction machine for excavating a deep foundation capable of precluding the possibility of interference among a sheave, a wire rope and an extenal part and improving arm extending/contracting operability. ;SOLUTION: A construction machine for excavating a deep foundation has a base stage arm 3 installed in a tip part of a vertically freely swinging boom 2 via a boom installing part 3g, and has a multistage extensible/contractible arm for extending/contracting plural arms extensibly/contractibly inserted into the base stage arm 3 via a wire rope and a sheave. Then, a part or the whole of the sheave installed in a lower part of at least one arm of the multistage extensible/contractible arm is superposed on an arm being a rear stage by one from the arm in a rotation axis directional view of the sheave. The sheave installed in an arm lower part may by arranged at least by two pieces on the left/right both sides so as to surround a rear stage arm of the arm.;COPYRIGHT: (C)2000,JPO