Method of measuring underground excavation position and underground excavation position measurement device

摘要

From the measured values respectively detected by the attitude detection sensor (22) integrally provided on the excavation bit (20) mounted on the tip of the excavation rod (10) and the triaxial magnetic sensor (23), respectively, The rotation angle , the inclination angle , and the azimuth angle around the x axis of the excavation bit (20) at each point of the excavation are obtained, and from the values and the length of one rod, the position change due to the excavation of one rod The quantity is obtained for each direction component, and the position change amount for each direction component obtained by excavation for a plurality of times is accumulated, and excavation position by excavation of a plurality of times and addition of rods is obtained. In this excavation position measurement, when excavating the ground without opening cut by the non-excavation method, even when the obstacle such as a building exists, the position of the boring tip is set to It can be accurately measured.