| 摘要 |
<p>PURPOSE: To eliminate notch at the fringe of a floor plate by making a thin supporting groove continuously or intermittently in the horizontal direction at a position slightly lower than the upper edge of the side face of floor plate facing a wiring trench and inserting stoppers, projecting downward from the opposite fringes of a cover having same width as the wiring trench, into the supporting groove. CONSTITUTION: Floor plates 1 are laid, at a predetermined interval, on a slab A to form wiring trenches B and supporting shelves 30 are projected from a position slightly lower than the upper fringe of supporting leg 11 for the floor plate 1, opposite end parts and a central part on the inner face of the wiring trench. A joint plate 31 bending perpendicularly downward is fixed to one edge of a supporting shelf 30 with the lower end thereof reaching a part similar to the lower end of the supporting leg 11 for floor plate. The supporting shelf 30 is provided with a U-shaped insertion groove 3 opening upward made of shock absorbing plastic and the lower end of stop fringe 21 of a cover 2 is inserted therein thus making the surface 10 of the floor plate flush with the upper surface 30 of the cover. Consequently, wiring work can be carried out by simply opening/closing the cover without moving the floor plate body.</p> |
