| 摘要 |
PURPOSE:To effectively inject a hardening agent into the ground by using a simplified trouble-free device in which a single nozzle is used for both water and the hardening agent. CONSTITUTION:In a hardening agent injector having a rotary table 12 to give vertical movement and rotary drive to an injection tube 1, the tip of the injection tube 1 is closed, and the main nozzle 3 having an opening in side wall at the lower end in the horizontal direction and a side nozzle 4 having an opening in the direction to join with the main nozzle 3 from above are provided. Also, a small-diameter tube 5 is fixed to one end in the tube 1, the tip is connected to the side nozzle 4, and the rear end is connected to a material supplyer 8 other than the injection tube 1. Water is first jetted from the main nozzle 3 and air is jetted under pressure from the side nozzle 4, while the injection tube 1 is penetrated into the subject ground with turning. When a given depth is reached, a hardening agent is jetted from the main nozzle 3 and air is jetted under pressure from the side nozzle 4, while the injection tube 1 is turned and raised and the hardening agent is injected into the ground. |
