| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method for repairing an underground structure capable of injecting and filling the desired grout over the entire back face of the underground structure and thus repairing voids that form there, even if a cavity exists at the upper portion of the back face of the structure and accumulated earth and sand exist at the lower portion of the back face; and to provide injection grout for use therein. SOLUTION: Non-fluidic grout 11 is injected and filled over the upper back face 3 of the underground structure 1, and after the grout has been hardened, fluidic penetrating grout 12 is injected over the lower back face 5 of the structure 1 and filled between the lower back face 5 of the structure 1 and the hardened grout 11 to integrate them together. The plastic grout is rendered non-fluidic by adding either one of a plasticizer, an aluminum salt compound, a montmorillonite clay mineral, water glass, and a high polymer water absorptive resin. The penetrating grout is rendered fluidic by adding either a gelling agent or an adhesive to a grout suspension. |
