| 摘要 |
<p>PURPOSE:To provide a method for taking out at any position the power supply, etc., of OA apparatus or the like from wirings in a floor duct recessed in a concrete slab, with which the works of taking out wiring from the floor duct can be facilitated and the grading of the placed concrete be done by a grading machine with no hindrance. CONSTITUTION:A floor duct 3 is arranged on a form 1 for concrete slab following the specified route, and concrete is placed. A hole is bored by a core drill 6 from the concrete oversurface till the floor duct 3, and an inset start 8 is fixed in this hole.</p> |
