| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily fit and connect a box culvert and maintain water cut-off performance even if connection parts are moved relative to each other. Ž<P>SOLUTION: Using an annular rubber joint member having an anchor part 2A buried in the male fitting part of the box culvert, a pedestal part 2B exposed to the outer peripheral surface S1 of the male fitting part, and a swelled part 2D which is in continuous with the pedestal part 2B with a constricted part 2C interposed therebetween and swelled round at the free end, the male fitting part and a female fitting part are fitted to each other to fall the swelled part 2D and hold the swelled part between the inner peripheral surface of the female fitting part and the surface of the pedestal part 2B. Consequently, the gap between the outer peripheral surface S1 of the male fitting part and the inner peripheral surface of the female fitting part is sealed. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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