EXCAVATING JIG FOR FOUNDATION PILE CONSTRUCTION

摘要

PROBLEM TO BE SOLVED: To provide an excavating jig for foundation pile construction, which allows the amount of diameter enlargement to be set large, while preventing rapid resistance from being offered from ground at the diameter enlargement. SOLUTION: An excavating shaft 3 is spline-coupled to a driving shaft 2 in such a manner as to be relatively displaceable in a vertical direction. A lower end of an enlarged blade 4 is coupled to the excavating shaft 3 in a vertically rotatable manner; an upper end of the enlarged blade 4 is coupled to a lower end of an auxiliary link 12 in a vertically rotatable manner; and an upper end of the auxiliary link 12 is coupled to the driving shaft 2 in a vertically rotatable manner. The enlarged blade 4 is fitted with a cutter for enlarged excavation.