Large span concrete floor slab form and construction method using the same

摘要

PROBLEM TO BE SOLVED: To provide a large span concrete slab form and a construction method using the same capable of omitting a falsework and expediting construction work through a structure which does not cause a fire resistance issue.SOLUTION: A bottom form plate 11 with steel rib materials 12 preliminarily fixed thereto is installed between a road side wall 1a and a central wall 1b without using an extensive falsework. A plurality of lower reinforcing bars 3a extended in a direction orthogonal to a span direction are inserted into each slit 13 on the steel rib material 12 with a space between the reinforcing bars 3a arranged in accordance with bar arrangement design. Other lower reinforcing bars 3b extended in the span direction are arranged on the lower reinforcing bars 3a and fixed thereto with binding wires. After arranging upper reinforcing bars 4a and 4b, concrete 7 is placed and cured. Fire-resistance performance is satisfied not by the bottom form plate 11 alone but by a reinforced concrete slab.