METHODS FOR EXPLORING THE GROUND CONDITION AHEAD OF THE TUNNEL FACE USING TRANSDUCER

摘要

A method for exploring a ground condition ahead of the tunnel face is provided to obtain the ground condition quickly and easily by using a transducer as an acoustic wave source. A rotation movement apparatus includes a source unit(30), a receiver unit(40), a rotating unit(50), and an external case. The source unit generates an acoustic wave and converts an electrical pulse signal into the acoustic wave. The receiver unit receives the acoustic wave and converts the acoustic wave into the electrical signal. The source unit and the receiver unit are connected to a mounting member through coupling members, respectively. The rotating unit includes a worm, a worm wheel, a support mount, and an implementation member. The worm wheel is rotated by the worm. The support mount supports the worm and the worm wheel. The implementation member is mounted on the worm wheel. The source unit, the receiver unit, and the rotating unit are contained in the external case.