| 摘要 |
PURPOSE:To enable to inject a solidifying agent in compliance with the natural composition of soil to be treated by attaching an injection tube smaller than a double injection tube at the tip of the double injection tube. CONSTITUTION:A mixing portion 10 where fluids separately sent under pressures through a double injection tube 1 are mixed is provided at the end portion of the fluid feeding path 6 in the outer tube 3 of the double injection tube body, and an injection tube 12 smaller than the diameter of the injection tube 1 body, having a jet nozzle 11, is also provided. Also, a rotary vertical-moving mechanism 4 and a solidifying agent supply mechanism 7 are provided to the upper part of the injection tube 1. The injection tube 1 is rotationally penetrated downwards into the ground while supplying pressure water, etc., through a fluid feeding path 5 into the tube 1, and when a given depth is reached, the tube 1 is pulled up by as much as the length of the injector body 12 to form as much an aperture as the difference in the diameters between the tube 1 and the injector body 12. Then, when fluids A and B are sent under pressure into the fluid feeding paths 5 and 6 of the tube 1 from the supplying mechanism 7, they are mixed together in the mixing portion 10 and injected from the jet nozzle 11 provided in the injector into the aperture 14, where the fluid mixture permeates into the surrounding ground. |
