| 摘要 |
<p>PURPOSE:To prepare up a drawing for locating the position of underground buried constructions by detecting the position of an underground buried construction on the ground, and indicating the detected position by based on 3 or more reference points. CONSTITUTION:Electric wave in pulse shape is radiated from an antenna 12 from an oscillator 13, and a detector 10 is moved approximately vertically to the tube axis direction of a steel pipe 9. A reception circuit 15 receives a reflection signal from the steel pipe 9 through the antenna 12 and then distances between detection points A, A2 to A6, and B, and the steel tube 9 is calculated to obtain the buried position, which is indicated on a visual display means 16. Then, positions of buried pipes 9a to 9d obtained by plural probings are drawn using trigonometrical survey method. Then by connecting the positions of the buried pipes 9a to 9d, corresponding to each probing with lines 28 to 31, location from the directly above position on a map of the buried tube 9a to 9d can be known accurately. Reliable location probing drawing can be thus prepared.</p> |
