| 摘要 |
PROBLEM TO BE SOLVED: To construct safely and efficiently a floor slab in a high accuracy. SOLUTION: A floor slab 36 is constructed by placing concrete through a center form 18 and a wing form 22. Scaffolds 40 extended down from a gantry crane 38 are connected to the external lower end of the wing form 22 through a support jack 42. One end of an expansible horizontal beam 44 and one end of a vertical beam 48 are pivoted to each other and respective other ends of these beams 44, 48 are connected by an expansible jack 50 to form a transferable fixing tool 52. The pivoted part of both beams 44, 48 is positioned at the upper corner of a main girder 20, and the lower end roller 46 of the vertical beam 48 is brought into contact with the lower edge of the main girder 20 to fix the wing form 22.
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