| 摘要 |
PURPOSE:To prevent the escapement of a grout during the injection thereof into the ground and to make it possible to concentratedly inject it within a designed range, by separately guiding each of a cement suspension and a water glass soln. in a specified ratio to a point in the neighborhood of the tip of an injection pipe, and combining them. CONSTITUTION:A grout is obtd. by mixing a cement suspension as soln. A with a water glass soln. as soln. B. in such a proportion as to give 0.4-3.2g of SiO2 in water glass component per 100cc of soln. A. In a technique for injecting said grout into the ground to fill a cave or charge it therewith, each of soln. A and B is separately guided to a point in the neighborhood of the tip of an injection pipe and they are joined at the tip of the pipe and then injected. Alternatively, soln. A and B are joined at a point before the tip of the injection pipe, and a primary gel is formed during the course from the junction to the injection port and injected into a cave at an injection pressure at which the primary gel is not broken. |
