| 摘要 |
PURPOSE:To reduce a necessary spring force, by enabling the upper and lower discharge slots of a grouting device for ground, to be switched with a piston, and by resetting the piston with the pressure of impregnate substance and the spring force. CONSTITUTION:Before start of excavation, a second piston valve 17 is pushed up with a rod or the like, and a check spring 22 is engaged with the peripheral wall of an outlet section 5. In this state, boring water is fed to a second watercourse 3 for excavation to a specified depth. After that, when a flash setting type hardener is fed into a first watercourse 2 and a main agent is fed to the second watercourse 3, then a piston 11 and the second piston valve 17 are dropped, and mixed flash setting type impregnate substance is injected into ground from an upper discharge slot 9. After that, when slow setting type impregnate substance is fed into the second watercourse 3, then the piston 11 is moved upwards with its pressure and the elastic force of a spring 14, and the slow setting type impregnate substance is injected into the ground from a lower discharge slot 15.
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