| 摘要 |
PROBLEM TO BE SOLVED: To provide a double floor capable of adjustment even on a board where a floor is stable and unevenness exists to some extent in requirement of pressure resistant strength, installment of wiring and easily exchanging the wiring. SOLUTION: A floor plate, a groove cover and a corner cover formed by using a thin steel plate are made main members. A wood-made, bamboo-made or the like surface decorative plate is previously additionally provided on the surface of the main member. The floor plate of a prescribed height is laid in an octagonal shape cutting tetragonal four-corners at before and behind and right and left equal intervals. The interval is a wiring passage. A part between the sides of the two floor plates adjacent at a prescribed interval is detachably easily covered with the rectangular cover plate. A part concentrating corner parts cutting the corner of the four floor plates is detachably easily covered with an octagonal corner cover.
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