| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor structural material, for surely welding a lower side bending part of a lattice reinforcement of a self-sustaining truss to a form, by reducing residual strain of the form for forming a rib group. SOLUTION: This floor structural material welds the lower side bending part 15 of the lattice reinforcement 13 of the self-sustaining truss 1 to the form 2, by welding an upper side bending part 14 of the lattice reinforcement 13 bent in a waveform to an upper chord reinforcement 11. The first rib group 21 for arranging a large number of ribs in the direction for crossing the longitudinal direction of the self-sustaining truss 1, is formed in the longitudinal direction in the form 2. The second rib group 22 composed of ribs lower than the ribs of the first rib group 21, and having a small pitch, is formed in a part for welding the lower side bending part 15 of the lattice reinforcement 13. COPYRIGHT: (C)2005,JPO&NCIPI
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