| 摘要 |
PROBLEM TO BE SOLVED: To provide a high function water cutoff check valve which is placed in a backfilling material injection hole of an earth/water pressure resistant structure, such as a shield segment, ensures a high water cutoff function, and can be fitted easily in the injection hole. SOLUTION: The high function water cutoff check valve 10 includes a check valve body 11 inserted in the backfilling material injection hole 2 and a ring water cutoff rubber 12 placed between the check valve body 11 and the inner surface of the backfilling material injection hole 2. A male screw 13, which is to be fitted into a female screw 4 of the backfilling material injection hole 2, is formed on the outer peripheral surface of the ring water cutoff rubber 12, while a taper surface 14 widening toward the check valve body 11 is formed on the inner peripheral surface of the water cutoff rubber 12. A taper surface 15 narrowing toward the water cutoff rubber 12 is formed on the outer peripheral surface of the check valve body 11. The taper surface 15 of the check valve body 11 is pushed in to the taper surface 14 of the water cutoff rubber 12. This causes the water cutoff rubber 12 to widen in diameter, which forces the male screw 13 of the water-stopping rubber 12 to firmly stick to the female screw 4 of the injection hole 2 without a gap. COPYRIGHT: (C)2010,JPO&INPIT
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