THREE-SHAFT DEEP MIXING METHOD OF SOIL STABILIZATION

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.;SOLUTION: Three rotating shafts 1, the leading ends of which are equipped with agitating blades 4, are juxtaposed. 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 only on the outer peripheral surface of the central rotating shaft 1b. The push-up and push-down of the soil by the spiral make soil pressure in the central part of an agitating area 5 deceased in the penetration/increased in the extraction, so that the horizontal flow of improved soil in the agitating area can be accelerated. The solidification material is supplied only from the two rotating shafts 1a on both sides. The rotating shafts 1a on both the sides among the three rotating shafts are rotated in the same direction, and the central rotating shaft 1b is rotated in a direction opposite to the rotational direction of the rotating shafts 1a, so that a series of agitating flows, such that the improved soil continuously flows throughout the agitating area 5, can be formed.;COPYRIGHT: (C)2006,JPO&NCIPI