Shield Tail Gap Measurement System

Abstract

The present invention provides a shield tail gap measurement system that uses a non-contact rangefinder to calculate the shield tail gap with high accuracy. Three non-contact rangefinders (11), (12), and (13) are installed on a mounting support (15) that extends from the U-shaped frame (33) toward the rear of the tunneling direction X, and rotate circumferentially by rotating the segment holding unit (32). The three rangefinders (11), (12), and (13) are arranged at intervals along the tunneling direction X, with the first rangefinder (12) facing the inner circumferential surface (40a) of the segment ring (40) assembled using the assembly device (30) at the rear, the second rangefinder (12) facing the inner circumferential surface (40a) of the segment ring (40) at the front, and the third rangefinder (13) facing the inner circumferential surface (51a) of the shell plate (51) at the front of the segment ring (40) at the front. They are then installed on the mounting support (15).

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