JOINT STRUCTURE OF SEGMENT, AND IRREGULARITY ADJUSTING METHOD AND IRREGULARITY ADJUSTING SEGMENT USING THE JOINT STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a joint structure suitable for improvement of assembling accuracy and irregularity adjustment regarding a bolt joint type segment joint, and a tunnel ring irregularity adjusting method and a irregularity adjusting segment using the joint structure.;SOLUTION: Bolt holes 3a, 3b of a joint face of an existing portal side segment 1b and a new working face side segment 1a are formed as mutually intersecting oblong holes. The mutual irregularity and apertures of the segments 1b in the existing segment ring can be two-dimensionally coped with by providing the bolt holes of the joint with biaxial oblong hole directions. Large irregularity can thereby be absorbed without limiting the direction of the irregularity.;COPYRIGHT: (C)2007,JPO&INPIT