| 摘要 |
PROBLEM TO BE SOLVED: To provide a water passage repairing method using grout material (a) that gives minimum buoyancy to a new pipe. SOLUTION: The grout material (a) is filled between an agricultural water tunnel water passage (a closed water passage) A and a reinforcing plastic composite pipe B inserted thereinto via filling ports 1. The grout material consists of milk a' which is formed of hardening material, kneaded water and admixture and to which the admixture as dispersant is added, and a bubble group c which is formed of diluted solution c' in which foaming agent is mixed and air c". It has a wet density of 0.5 t/m<SP>3</SP>or lower, a flow value of 140 mm or smaller, and a compression strength of 500 KN/m<SP>2</SP>or higher for a material age of 28 days, wherein air has a capacity ratio of 65% or more, the weight ratio of the kneaded water to the hardening material is 55% or less, and the weight ratio of the admixture to the hardening material is 0.1-0.5%, meaning low gravity. The grout material gives small buoyancy to the new pipe and serves for easy buoyancy preventing measures. In a construction site, the diluted solution in which the foaming agent is dissolved and air are manufactured by an bubble manufacturing device 14b, and the bubbles and the milk are kneaded by a kneading machine 14a and filled between the pipe B and the closed water passage via a filling pipe 10. COPYRIGHT: (C)2008,JPO&INPIT
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