| 摘要 |
PURPOSE:To perform the improvement of ground with good efficiency by a method in which a guide pipe is attached with a spacing in a fixed (not turning) state to a rotary shaft having a stirring blade on its lower end, and through a powder supply path between the rotary shaft and the pipe, a powder is jetted from a nozzle. CONSTITUTION:A guide pipe 6 is attached with a spacing in a fixed state to a rotary shaft 1 having a stirring blade 2 on its lower end to form a powder supply path 7 between the shaft 1 and the pipe 6. A motor 4 is actuated to turn the shaft 1 until it is penetrated into the ground, and the ground is agitated by the blade 2 being turned. A powder for ground improvement is then supplied through a powder supply port 9 into the path 7, injected from a nozzle 8 into the ground, and mixed with the ground. since the occurrence of centrifugal force responsible for the adherence of powder to the inner wall of the path 7 is eliminated, the blocking of the path 7 can be avoided, and the frictional resistance with the natural ground can be obviated. |
