DEVICE OF ANCHOR FOR MEASURING DISPLACEMENT OF INNER HOLE IN TUNNEL

摘要

PURPOSE: An anchor device is provided to precisely measure the displacement of an inner hole in a tunnel by preventing the anchor from being broken caused by blasting or excavating while not displacing the installed location of the anchor. CONSTITUTION: An operation for measuring the displacement of an inner hole in a tunnel(300) is operated after blasting the tunnel. To install an anchor device(100), a hole is formed on a certain location of the tunnel. If an operator holds an anchor(130) for pulling to an arrow direction, a folded body(120) is spread. Therefore, the anchor integrally formed at one end of the body is withdrawn to the arrow direction. Herein, the movement of the body is limited by a protrusion(112) for controlling the withdrawn location of the anchor.