| 摘要 |
PROBLEM TO BE SOLVED: To improve workability by constituting an upper end member of a truss structure reinforcing body having the lower part embedded in a concrete board main body under the horizontal plate part by an upper end steel frame having vertical ribs on the under surface. SOLUTION: This floorboard structure has a reinforcing body 3 of a truss structure having the lower part embedded in a concrete board main body 1 and the upper part projecting from the upper surface of the concrete board main body 1. The reinforcing body 3 is composed of lower end reinforcements 7 being arranged under an upper end steel frame 6 and extending in the same direction as the upper end steel frame 6 and lattice reinforcements 8 extending in the same direction by bending in a zigzag shape so as to alternately join the upper end steel frame 6 and the lower end reinforcements 7. The lower end reinforcements 7 and the lower parts of the lattice reinforcements 8 are embedded in the concrete board main body 1. Thus, flexural rigidity of a precast concrete board is enhanced, and even if the precast concrete board is formed for a long span, timbering and a small beam are not required. Thus, a cost is reduced, a construction period is shortened, and field workability is advantageously improved.
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