| 摘要 |
PROBLEM TO BE SOLVED: To surely change over the injection of a solidification material despite of having a simple structure and mechanism. SOLUTION: In an insertion process of an improvement rod 1, if a lower part injection port 1b arrives from the lowermost end in a depth-directional improvement range to an upper position by a separate distance between a lower part injection port 1b and an upper part injection port 1u, the other opening of a changeover pipe 2P of a changeover device 2 is connected to a first outlet 2a alone and the improvement rod 1 is rotationally inserted while injecting compressed air with the powder solidification material from a solidification material pneumatic feeding device 3 from the lower part injection port 1u alone. In a pull-up process of the improvement rod, the other opening of the changeover pipe 2P is changed over to a state connected to a second outlet 2b alone, and the improvement rod 1 is rotationally pulled up while injecting the compressed air with the powder solidification material from the solidification material pneumatic feeding device 3 from the upper part injection port 1u alone.
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