METHOD FOR MEASURING PERFORATION ANGLE AND PERFORATION ROUTE OF TUNNEL

摘要

PURPOSE: A method for measuring a perforation angle and a perforation route of a tunnel is provided to precisely and easily measure the perforation angle and the perforation route of the tunnel. CONSTITUTION: Plural perforation holes(4) are formed in a blind end of a tunnel(2) in order to set dynamite. An excavation degree of the tunnel(2) is determined depending on an angle and a length of the perforation holes(4). Then, a target member(6) is inserted into each perforation hole(4) and an angle and a perforation route of the perforation holes(4) are measured by using measurement equipment(8). The target member(6) has a cylindrical pipe, a rod provided at an end thereof with a target(12), and a packing for allowing the cylindrical pipe to be positioned in line with the perforation holes(4).