Patent ID: 7490439
Filing Date: 2009-02-17
Classification: E04F

Abstract:
1. A double floor structure comprising: an upper floor comprising a plurality of upper floor members; a lower floor; a plurality of rods for supporting said plurality of upper floor members, said plurality of rods being erected on a common base plate disposed on said lower floor; and upper floor mounts connected to said rods, respectively, said upper floor being mounted on said upper floor mounts, wherein each of said upper floor members includes a floor panel portion for forming a floor surface, a first wall portion extending downwards from circumferential sides of said floor panel portion and extending continuously in a circumferential direction, and a second wall portion spanned between opposed portions of said first wall portion and progressively increased in thickness toward a center of said floor panel portion, said floor panel portion, said first wall portion and said second wall portion being formed unitarily, each of said upper floor members including a penetration means and being fixed to at least one of said upper floor mounts by a fixing member penetrating through said penetration means, wherein each of said upper floor mounts comprises a tapped hole, wherein said fixing member comprises a bolt and said penetration means comprises a penetrating hole, and wherein each of said upper floor members is fixed to said at least one of said upper floor mounts by said bolt penetrating through said penetrating hole and being fastened into said tapped hole, wherein each of said upper floor mounts comprises a holding means for holding at least one of said upper floor members, said holding means including an opening larger than an outer shape of a respective one of said rods, and including said tapped hole, wherein a deformation restraining means for supporting said holding means so as to restrain bending deformation of said holding means is provided between said holding means and said lower floor, and wherein said deformation restraining means includes a screw rod, and a nut screw-engaged with said screw rod so as to be movable between said holding means and said lower floor, said holding means comprises a passing hole through which said screw rod is passed, and said holding means is supported by said screw rod passed through said passing hole and said nut screw-engaged with said screw rod, whereby said bending deformation is restrained.