| 摘要 |
PURPOSE:To attain economical and complete waterstop and accomplish recovery of strength and watertightness for a concrete structure itself, by impregnating a closed chamber formed at water leakage points of a concrete structure with a waterstop grout composed mainly of a hydrophilic, liq. polyurethane prepolymer so as to seal up the chamber. CONSTITUTION:A waterstop for a concrete structure is accomplished by the following method. That is, a closed chamber 24 formed at water leakage points 21 of a concrete structure is impregnated with a waterstop grout 27 comprising a hydrophilic, liq. polyurethane prepolymer and optionally a cement added thereto so as to seal up the chamber. Numeral 22 designates an impregnation pipe and numeral 23 a rapid bonding agent. Thereupon, the hydrophilic, liq. polyurethane prepolymer reacts with the leakage water within the concrete structure, thereby attaining foam curing of the prepolymer. Due to the foaming pressure and volume expansion during the foam curing, the prepolymer penetrates into the hollow portion of every crack at water leakage points of the concrete structure, thereby attaining sealing and bonding of the cracks. As a result, recovery of watertightness and strength can be accomplished for the concrete structure.
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