| 摘要 |
PROBLEM TO BE SOLVED: To contrive the improvement of a function by using a composition comprising (meta)acrylic acid metallic salt and the other prescribed material as a grout composition for ground. SOLUTION: A composition comprising the univalent or bivalent metal salt of (meth)acrylic acid, water soluble compound having an oxyalkylene group and two or more (meth)acryloyl groups and water is provided as a grout composition. For instance, a plurality of injection pipes 2 are driven into ground along the circumferential direction of the tunnel of a cutting face during execution at a prescribed interval. Next, the grout composition is pushed in the ground from the pipe 2 to be hardened, and after the hardener 3 of the grout composition is formed, working excavating the tunnel is repeated. In this case, a fore- poling method or a fore-piling method is preferable. Thereby the problem of combustibility and skin stimulativeness can be dissolved, since it has low viscosity, permeability can be improved, quickly hardened, strength can be improved, and initial effect can be held for a long time. |
