UNDERGROUND CAVERN SEARCH METHOD USING A HAMMERING TEST

摘要

The invention and buried the inverted T -shaped concrete taeum means to be irradiated to each point , the vibration generator to generate a hitting vibration ( longitudinal ) by striking the other of the inverted T -shaped eumche taeum means , from each of the station through the concrete body to be irradiated from the frequency measuring device comprises a trigger sujingi and PSI blow delivered from the rear to receive the frequency of oscillation , the received frequency and its amplitude relative to the display area with a certain frequency and , as shown in the frequency band is wide high-frequency components are dominant induced a large value for each station so that it extends soundness index (SI) obtained by back , and so the sound indices can be determined whether the defect , including the co- irradiated concrete body ( drainage channel , etc.) on the back as if to converge to a certain value .