| 摘要 |
PURPOSE:To improve a soft ground without deviation of grout, having high infiltration properties in the direction of a ground surface, by a method wherein, after grout having low infiltration properties is poured through the upper discharge port of a pouring pipe, grout having high infiltration properties is poured through a lower discharge port. CONSTITUTION:When, after a pouring pipe is penetrated into a soft ground, an aqueous glass solution and a reaction agent are fed through an outer pipe 2 and an inner pipe 1, respectively, a valve 10 is moved downward by dint of the flow pressure of the reaction agent, and the aqueous glass solution and the reaction agent are mixed together to pour the mixture into a ground through an upper discharge port 3. When grout having high infiltration properties is poured only through the outer pipe 2, the valve 10 is moved upward through the resilient force of a spring 11, the grout is poured into a ground through a lower discharge port 4. This, since precedingly poured grout having low infiltration properties functions as a packer, enables subsequently poured grout having high infiltation properties to be prevented from deviation in the direction of a ground surface. |
