| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor member capable of suppressing upsurge of floor members, although floor members can move relatively in the direction of long side mutually in a short side part to absorb dimensional change due to expansion and contraction in the direction of long side of floor member, and preventing occurrence of ugliness due to extreme difference in an interval of a clearance in the short side part and competitive rise in a section where there is no clearance. SOLUTION: An upper side projection part 2 composed of a thin wall part 21 on a root side and a thick wall part 22 on an end fringe side is formed in such a way that its upper face becomes flush with a general upper face of a basic material 1 whose outer shape is substantially like a long rectangular plate on a short side on one side of the basic material. A lower side projection part 3 composed of a thin wall part 31 on a root side and a thick wall part 32 on an end fringe side is formed in such a manner that its lower face becomes flush with a general lower face of the basic material on a short side on the other side. Dimension of each part is set within a predetermined scope. COPYRIGHT: (C)2005,JPO&NCIPI
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