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 underground excavation work with small vibration and low noise.;SOLUTION: This excavating device 1 for underground excavation is provided with 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 22b, etc. incorporating pistons 61 giving hitting forces to the bits 42a, etc. by the energy of a working fluid; a fluid storing part 30 for storing the working fluid fed into each piston case member 22b, etc.; a working fluid flow path 352 allowing the working fluid to be fed into each piston case member 22b, etc. to pass; and a rotary body 40 having a plurality of communicating holes 4a, etc. for making the fluid storing part 30 communicate with each flow port 3a, etc. to feed the working fluids into the flow ports 3a, etc. in each working fluid flow path 352 from the fluid storing part 30.;COPYRIGHT: (C)2008,JPO&INPIT