| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor structural material that can cope with a large span. SOLUTION: This floor structural member is formed by arranging a plurality of hanging members 2 in parallel on the upper face of a base 1 and hanging a truss 6 disposed in a right-angled direction to the hanging members, from the hanging members. The arrangement spacing of the hanging members 2 is made smaller in the longitudinal center part of the truss 6 than both side parts.
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