| 摘要 |
PURPOSE:To detect the abnormality of underground piping by exciting in terms of sound wave pipings buried in a burying body by a sound wave source installed in a branch pipe, and at the same time, irradiating microwave on the surface of the burying body near the place where the piping is buried. CONSTITUTION:A water leakage position detecting device 11 consists of an ultrasonic sound source installed mainly in the branch pipe 3 of a water pipe 1 and excites in terms of ultrasonic wave the water pipe 1 and water in the water pipe 1, a synchronizing signal detector 12, a microwave device 13 and a recorder 10. The ultrasonic wave sound source consists of a vibrator 6 and a vibrator driving device 7. The device 13 is provided movable near the ground surface, and irradiates microwave on the ground surface of the place where the water pipe 1 is buried, and at the same time, detects the reflected wave of the microwave modulated by feeble ultrasonic vibration of the ground surface propagated from the water pipe 1 through the ground 2. Thus, the presence of abnormality of the state of burying can be judged accurately. |
