| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a cavity survey instrument of an outside underground tube which makes it possible to effectively survey the cavity of the deep position generated at the outside underground tube. SOLUTION: A hammer unit 7, a vibration sensor 9, a perforating unit 11, a television camera 13, and a repairing unit 15 are sequentially provided from the forward side on a moving body 5 having crawlers 3. An impact is applied to the inner wall of a sewage tube B by the hammer unit 7, the vibration generated at the tube is measured by the sensor 9 to survey a cavity. Thereafter, a hole is perforated at the tube B by the unit 11, the size of the cavity is grasped by the camera 13, and then filler is poured in the cavity by using the unit 15.</p> |
