Being the cutter bit exchange timewise detection device of the worn detection mannered null shielded tunnelling machine of the cutter bit of cutter

摘要

PROBLEM TO BE SOLVED: To provide a cutter bit abrasion sensing apparatus of a shield machine for continuously sensing replacement timing of cutter bits without providing a working space for replacement or the like in the case that the cutter bit is replaced on the way of boring as the long distant boring shield machine, and to provide a cutter bit charging device of the shield machine using it.;SOLUTION: The cutter bit wear sensing apparatus comprises a first abrasion sensing bit 9 provided on a cutter head 4, arranged at substantially the same position as the cutter bit in boring starting and sensing abrasion of the cutter bit; and a second abrasion sensing bit 11 positioned rearward from the cutter bit in excavation starting, moved forward after replacement of the cutter bit, arranged at substantially the same position as the cutter bit after replacement and sensing abrasion of the cutter bit after replacement.;COPYRIGHT: (C)2004,JPO