PROBLEM TO BE SOLVED: To simplify the timbering of a horizontal overhang floor system frame form and omit wires, rods, flush type fixtures, etc., in constructing a steel bridge having a small number of main girders. ;SOLUTION: Large beams 15 and 15 are built over in the axis direction of a bridge in parallel with and adjacent to each other, large span truss materials 18 and 18 are built at ends of both beams 15 and 15, the timbering 19 of an overhang section floor system form is hung, and a beam 30 is thrown over between the outer frames 19 and 19 of both sides with specified strength and rigidity reinforced by utilizing a substance comprising scaffold hanging pieces or support pipes 31 prefabricated in a factory as support members for the cross-beam 7 of the outer frame 19 provided at the corner sections of the web of the cross-beam 7 and an upper flange 8 and a lower flange 8. Then, when passing through between bridge piers, an upper horizontal beam 22' abutting on the dolly block between the end section of the upper horizontal beam 22' and a bridge pier by utilizing the scaffold piece or the support pipe 31 is removed to avoid the interference of the bridge pier and the outer frame 19 to smoothly move the outer frame 19 of a concrete floor system form overhang section.;COPYRIGHT: (C)2000,JPO
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