| 摘要 |
PROBLEM TO BE SOLVED: To form a pull-out hole at an arbitrary position of a piping material and to freely select the pull-out position of a cable. SOLUTION: A piping material 1 with a conductor 3, which is continuously provided in its circumferential wall in a longitudinal direction, is embedded in a slab 10. A current is applied to the conductor 3, and an electromagnetic field generated by the current is searched to detect the position of the embedded piping material 1 from the surface of the slab 10. Then, by using the detected position as a reference, a pull-out hole which penetrates the piping material 1 is formed by a drilling tool from the surface of the slab 10 and a cable laid in the piping material 1 is pulled out through the pull-out hole. |
