HIGH-PRESSURE INJECTION WATER CUTOFF METHOD USING WATER CUT-OFF MATERIAL COMPOSED OF HYDROPHILIC ONE-COMPONENT POLYURETHANE PREPOLYMER, AND THE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a high-pressure injection water cutoff method and a water cutoff material, which enable appropriate cutoff by establishing required performance, that is, injection filling properties, cutoff adhesive properties and durability, even for a water leakage crack such as a cracked part of a concrete structure and a placing joint part thereof.;SOLUTION: A cutoff material injecting hole 2 is drilled in the water leakage crack 3 of a concrete wall 1 at a prescribed angle with respect to a concrete surface layer, so that a hermetically sealed chamber 5 for retaining the cutoff material can be formed while crossing the crack 3; next, an injection plug 7 with a non-return valve is fitted into the hole 2 after the crack 3 of the concrete surface layer is sealed and after a hollow reinforcing member 12 filled with a water-absorbing polymer 11 is inserted into the chamber 5; after that, the cutoff material 4, which is mainly composed of a hydrophilic one-component polyurethane prepolymer, is pressure-injected from the injection plug 7 so as to be infilled into the hermetically sealed chamber and the water leakage crack in prescribed quantities; and the cutoff material 4 is made to permeate into the water leakage crack while being foamed by the chemical reaction of the water-absorbing polymer and infiltrating water.;COPYRIGHT: (C)2004,JPO&NCIPI