| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground improvement construction machine in which penetration accuracy of its drilling blade in a vertical direction is improved by preventing displacement and decentering caused by resistance force which the drilling blade and a drive shaft of the ground improvement construction machine receive from ground or a preceding soil improvement body, and a ground improvement method using the same.SOLUTION: A corotation prevention blade 11 is mounted to a position immediately above a ground improvement construction drilling blade 10 in a non-rotating state and in an immovable state in the axial direction, and is structured so that its main body is a frame material 11a arranged in the diameter line direction of a drill-hole 14 drilled by the drilling blade 10 and a displacement suppressing plate 11b having a circular arched curved surface with the same curvature as that of the drill-hole 14 in the circumferential direction is mounted at a position which is a tip portion of the frame material 11a and in contact with a hole wall inner surface of the drill-hole 14 drilled by the drilling blade 10. A corner part 11c protruding from the outer surface of the displacement suppressing plate 11b in the same direction as that of the frame material 11a is dug into the wall surface soil of the drill-hole 14 and keeps a non-rotating state, thus exhibiting corotation prevention action for drilled soil. |
