DEVICE FOR PREDICTING AND DETECTING COLLAPSE OF SLANT SURFACE

PURPOSE:To detect occurrence of collapse of a slant surface quickly, by providing a plurality of displacement detecting mechanisms on the slant surface, connecting series connected bodies, which comprise switches and electric impedances and provided in the displacement detecting mechanism in cascade, and measuring the synthesized electric impedance value of said connected circuits. CONSTITUTION:Anchor rods are embedded in the slant surface so that they pierce through a part of a slant surface protecting frame and reach a firm ground. A displacement detecting mechanism 16 detects the displacement and is released. The mechanism is constituted by a switch 23 and an electric impedance 26. Both ends of a series connected body 27 of the switch 23 and the electric impedance 26 are made to be a pair of first terminals P. Both ends of the electric impedance 26 are made to be a pair of second terminals S. A plurality of 2 pair terminal circuits C-1-C-N for individual displacement detecting mechanisms are connected in cascade. A means 31, which measures the synthesized impedance value, is connected to either of the opened first terminal pair P or the opened second terminal pair S of said cascade connected circuit.