EXCAVATING EQUIPMENT FOR WORKING IN WIDENED BOTTOM HOLE AND WORKING METHOD AT WIDENED BOTTOM HOLE

摘要

PROBLEM TO BE SOLVED: To provide a technique for execution of work for a widened bottom foundation portion with a high reliability in a vertical hole excavating method. ;SOLUTION: This excavating equipment for working at a widened bottom hole can excavate a shaft diameter portion and a widened bottom diameter portion of a widened bottom hole 14 with a rotating roller cutter by rotating and driving the main body 2 of an excavating equipment. In this case, a supporting frame 7 for diameter widening inner cutter oscillated and driven with a hydraulic cylinder 12 through a sliding member 11 and arm links 9 and 10 and a supporting frame 8 for diameter widening gauge cutter are supported by shaft in an oscillating manner at a position below a roller cutter mounting surface 2c of a roller cutter mounting member 2a and at an inner position from the most outer periphery of the shaft diameter portion of the widened bottom hole 14. Moreover, a notch is provided to a roller cutter mounting members 2a, permitting elevation passing under the notch during its oscillation by both the supporting frames 7 and 8, and moreover, the arm link 10 is supported with a shaft at the rear of the supporting frame 8 for a widened diameter gauge cutter, and inner peripheral side and the outer peripheral side of the widened bottom portion are borne by both the supporting frames 7 and 8, and widened diameter inner cutter 5 and widened diameter gauge cutter 6 are provided for permitting the excavation.;COPYRIGHT: (C)1998,JPO