METHOD AND DEVICE FOR MEASURING LEADER POSITION

摘要

PROBLEM TO BE SOLVED: To provide a method for measuring leader position capable of automatically and continuously measuring the position and attitude of a leader for excavating a tunnel of relatively minor diameter having a curve. SOLUTION: A light receiver 27 is mounted on a leader 21, optical path refracting devices 11 for controlling the refraction of light by combining a pair of wedge prisms are mounted on a leader following jig 32 connected to the leader 21, so that the laser beam emitted from the laser boresight 41 of a starting pit 22 is bent so as to reach a light receiver 27, and the route of the bent light is known, whereby the position of the leader 21 is measured.