| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently support a load transmitted downward from an upper floor board even when the number of holes and the number of reinforcing bars are not increased by forming a plurality of cuts or notches on the upper end of a corrugated steel plate, making the cut and the notch a curved shaped, and opening a plurality of the holes on the upper end. SOLUTION: Holes 27, 33 and a notch 24 for passing a bolt 23, reinforcing bars 29, 35 are provided in an iron plate being a material. Thereafter, it is bent in the corrugated shape of a trapezoid, and the whole is made to have a substantially two-wave part. A part A corresponding to the upper side of the trapezoid is bent on upper and lower ends. The part 25 of a shape bent on the upper end of the waveform steel plate 3 can receive a load transmitted downward from an upper floorboard 7 as compression force. Thus, even when the number of the holes 27, 33 and the number of the reinforcing bars 29, 35 are not increased, the working of jobsite can be decreased since the load can be sufficiently supported.
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