Heading fall monitor of tunnel

摘要

(57) Abstract Objective Fall of the heading of the tunnel is monitored usual mechanicallyru thing is designated as purpose. Constitution The jig 5 which is locked to the heading 1 of the tunnel and OsamuThe multiple which respectively from tool extends to the multiple optional positions of the headingArm 6 and, being installed in each arm, displacement of the headingIt measures the displacement measurement equipment 7 which and the displacement measurement equipment measured the displacement whichIn the monitor 8 which is monitored whether or not it exceeded specified reference level,From fall of the heading of the tunnel is monitored. As for aforementioned jig headingIt Perforating with the lock volt/bolt 4 which is locked to the hole which facilities is done fixingre, for aforementioned displacement measurement equipment using ultrasonic sensor or displacement gaugeru. As for the monitor, when measurement displacement exceeds reference level, fallJudging, that there is a danger, the alarm means 9 which give out alarm havingThe te it is.