EXCAVATING DEVICE AND EXCAVATING METHOD FOR SHIELD MACHINE

摘要

PROBLEM TO BE SOLVED: To continuously excavate over a long distance by a simple structure.;SOLUTION: In this excavating device, the excavating surface of a cutter head 2 rotatably supported on a shield body at its front part comprises a circular bit guide member 21 disposed eccentric to an excavating center, a bit support ring 22 swingably supported along the bit guide member 21 and having a plurality of excavating bits 23, and a bit swing device 24 swinging the bit support ring 22 when the excavating bit 23 is worn to change the position of the excavating bit 23.;COPYRIGHT: (C)2006,JPO&NCIPI