| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of a double floor wherein worsening of soundproofing performance, floor creaking, and inconvenience due to expansion and shrinkage of a floor member by moisture suction and dehumidification occur. SOLUTION: When a lower part lateral member in an opening part is butted on a flooring member, a clearance W<SB>1</SB>of 1.5 mm or more and 8 mm or less is provided between the lower part lateral member in the opening part and the flooring member, and an upper part of the clearance is covered with a clearance hiding member joined with the flooring member. In length W of the clearance hiding member overlapped on the lower part lateral member in the opening part, 1.5 mm≤W≤100 mm is satisfied. In the relation of length H<SB>1</SB>of a fixing part of the clearance hiding member to be joined with the flooring member to a surface of the flooring member, length H<SB>2</SB>of a fixing part of the clearance hiding member to an end face of the flooring member, and thickness T of the flooring member, 0.2≤(H<SB>1</SB>+ H<SB>2</SB>) /T≤2 is satisfied. COPYRIGHT: (C)2004,JPO
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