| 摘要 |
PURPOSE:To smoothly and exactly inject a grout into a definite range of ground by a method in which a grout having a specific gel time is injected radially from the tip of an injection rod without turning the rod. CONSTITUTION:A pit is excavated by jetting a boring water from the tip of a grout monitor 2 in the previous process, an injection rod 1 is penetrated to a given depth, a valve body 4 is closed by a plug 7, and the boring water is sent into inner and outer flow pathes 3a and 3b under pressure and jetted horizontally from the nozzle 6 of the side wall of a mixing chamber 9. Under the condition, a two-component grout having a gel time of 10-100 seconds is sent under pressure independently into the inner and outer pathes 3a and 3b by means of a grout pump and uniformly mixed together in the mixing chamber 9, and then the mixed grout is injected radially in the horizontal direction from the nozzle 6. In this case, the injection rod 1 is gradually raised in a step-up manner and the grout is continuously injected without turning the injection rod 1. |
