| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for restraining warpage of a pre-cast concrete plate capable of achieving optimum flattening corresponding to a warpage state. SOLUTION: The pre-cast concrete plate 1 has a surface decoration material 2 on its surface. A linear steel material such as a steel rod or a twisted steel wire is arranged in the surface direction at a position decentered to the surface side from the central position of the thickness of a concrete layer 3. After the concrete layer is cured, tension is applied to both ends of the concrete layer to fix both ends to the concrete plate 1 to correct warpage bringing the surface of the concrete plate to a protruded surface by its restoring contraction force, so that tension f can be adjusted corresponding to the warpage of the plate. By stretching the linear steel material while confirming the degree of the warpage, the flattening is made possible easily and properly. COPYRIGHT: (C)2004,JPO
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