WATER STOP MATERIAL AND WATER CUT-OFF STRUCTURE OF ELASTIC JOINT

PROBLEM TO BE SOLVED: To provide a water stop material which maintains a water stop property for a long period of time. SOLUTION: The water stop material 10 is placed between the end side of a waterproof sheet 50 disposed on the outer periphery of a concrete underground structure 20 and the concrete underground structure 20 to prevent water infiltration from the end side of the waterproof sheet 50. The water stop material 10 has an adhesive elastic member 14 which is placed between the end side of the waterproof sheet 50 and the concrete underground structure 20 and extends in the direction of extension of the end of the waterproof sheet 50, and a harder elastic member 12 which is placed between the end side of the waterproof sheet 50 and the concrete underground structure 20 to be at least closer to the opposite side to the end of the waterproof sheet 50 than the adhesive elastic member 14, extends in the direction of extension of the end of the waterproof sheet 50, and has a hardness higher than that of the adhesive elastic member 14. This allows the water stop material 10 to maintain the water stop property for a long period. COPYRIGHT: (C)2008,JPO&INPIT