CAVITY DETECTING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a cavity detecting system efficiently scanning along a tunnel inner wall face and accurately detecting cavities formed inside a tunnel wall. SOLUTION: A multiaxial manipulator 5 is controlled by a manipulator controller 6 so as to form a gap between a surface of an antenna 8 and the wall face 9 of a tunnel 1 and move a position of the antenna 8 every time a tractor 3 travels from one end to another end of the tunnel 1.