| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-shaft deep mixing method of soil stabilization, which enables soil and a solidification material to be surely and efficiently agitated and mixed together, and a three-shaft deep mixing apparatus for the soil stabilization, for use in the method. SOLUTION: Three rotating shafts 1, the leading ends of which are equipped with agitating blades 4, are juxtaposed; the rotating shafts 1a on both sides are rotated in the same direction; the central rotating shaft 1b is rotated in the direction opposite to the rotational direction of the rotating shafts 1a, so that a series of agitating flows, such that improved soil continuously flows throughout an agitating area 5, can be formed; and a stabilizer 8 is provided between the lower ends of the respective rotating shafts. The solidification material is supplied only from the two rotating shafts 1a on both the sides. A spiral 6, which pushes surrounding soil upward when the rotating shaft is normally rotated in penetration and which pushes the surrounding soil downward when the rotating shaft is counterrotated in extraction, is provided on the outer peripheral surface of the central rotating shaft 1b. COPYRIGHT: (C)2006,JPO&NCIPI
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