Shield Tail Gap Measurement System

Abstract

This invention provides a measurement system that uses a non-contact rangefinder to calculate the shield tail gap with high accuracy and can smoothly adapt to changes in the length of the segment ring in the tunneling direction. The three rangefinders (11), (12), and (13) are arranged at intervals along the tunneling direction X, with the first rangefinder (11) facing the inner circumferential surface (40a) of the rear part of the segment ring (40) in the tunneling direction X, the second rangefinder (12) facing the inner circumferential surface (40a) of the front part of the segment ring (40) in the tunneling direction X, and the third rangefinder (13) facing the inner circumferential surface (51a) of the shell plate (51) in front of the segment ring (40) in the tunneling direction X. They are then installed on the mounting support (15). At least one of the first distance measuring instrument (11), the second distance measuring instrument (12), and the third distance measuring instrument (13) is installed on the mounting support (15) in a position that can be adjusted in the tunneling direction X.

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