| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that cracking cannot be prevented due to the absence of the effective action of the application of a compressive force, because such a high compressive force as to deform not only concrete but also a steel girder is required and the concrete is shrunk by drying and shrinkage even after the compressive force is applied, in a conventional construction method wherein the forced compressive force is applied to the concrete integrally connected to the steel girder, in an early time after the construction of a concrete floor slab, so as to cancel out a tensile force occurring on an intermediate supporting point section, in the building of a continuous composite girder bridge. SOLUTION: The concrete floor slab 9 is constructed in an unconnected state on the steel girder 4 which is laid across the intermediate supporting section 3; after that, building work is performed in other sections; and after the concrete floor slab is sufficiently dried and shrunk, the forced compressive force is applied to the concrete floor slab. Thus, the compressive force is applied to the concrete floor slab alone; the amount of shrinkage caused by the drying and shrinkage, occurring after the application of the compressive force, is reduced; and the compressive force is effectively applied so that the cracking can be prevented in an appropriate manner. COPYRIGHT: (C)2006,JPO&NCIPI
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