| 摘要 |
For constructing a pillar in an earthen foundation, a consolidating fluid is sprayed inside the earthen foundation from consolidating fluid spray nozzles provided on a rotating shaft, and then the consolidating fluid and the soil of the original foundation are stirred and mixed. The consolidating fluid spray nozzles which spray the consolidating fluid approximately horizontally are provided on the rotating shaft. The pillar is formed in the earthen foundation by stirring and mixing together the consolidating fluid and the soil of the original foundation in such a way that the rotating speed of the rotating shaft is faster for clayish soil than for sandy soil, the pressure from the consolidating fluid spray nozzles is higher for clayish soil than for sandy soil, and the penetration speed of the rotating shaft is slower for clayish soil than for sandy soil. Consequently, it makes possible to form in the earthen foundation a high-quality foundation-improvement pillar by the most efficient method with respect to differences in the soil.
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