EXCAVATING DEVICE FOR UNDERGROUND EXCAVATION, ROTARY EXCAVATOR, AND UNDERGROUND EXCAVATION CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an excavating device for underground excavation, a rotary excavator, and an underground excavation construction method for achieving satisfactory underground excavation work with small vibration and low noise.;SOLUTION: This excavating device 1 for underground excavation has a plurality of bits 42a, etc. having smaller outside diameters than that of an excavating device body 2 and advancing and retracting to/from an excavation side; piston case members 22a, etc. incorporating pistons 61 giving hitting forces to the bits 42a, etc. by the energy of a working fluid; and a fluid storing part 30 for storing the working fluid fed into each piston case member 22a, etc.. In each piston case member 22a, a travel distance of the piston 61 reciprocating to give the hitting forces to bits 41, etc. provided in the piston case members 22a, etc., respectively, is set to be different per piston case member 22a in order to hit and drive each bit 41, etc. by staggering an operation time of each bit 41, etc. from each other.;COPYRIGHT: (C)2008,JPO&INPIT