| 摘要 |
PROBLEM TO BE SOLVED: To prevent a back-filling material from freezing when a cushioning material is constructed, and to prevent cracks from forming in a joint or the like of the cushioning material or an FRPM plate even when retained water repeatedly freezes and melts due to the changes of temperatures after construction of the cushioning material. SOLUTION: A molded foamed ethylene/propylene rubber 4 as a cushioning material is arranged on an inner surface 1 of a water channel W or the like, and it is covered with the FRPM plate 3 and is fixed by an anchor 2. Since the foamed ethylene/propylene rubber is the body which is molded in advance, it does not freeze even when it is constructed at a low temperature, contrary to the case where a fluid cushioning material is used. Further, since the foamed ethylene/propylene rubber is elastic, even when a cubic volume of the water retained between the inner surface and the foamed ethylene/propylene rubber or the like is changed by freezing and melting, the change of the cubic volume is absorbed by the foamed ethylene/propylene rubber. Therefore, the cracks are hardly formed in the joint or the like of the FRPM plate by the change of the cubic volume. COPYRIGHT: (C)2008,JPO&INPIT
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