| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a soil improvement method for uniformly finishing a preparation surface around a prepared solidification body. <P>SOLUTION: When turning and driving a jetting pipe rod while jetting an ultrahigh pressure hardening material in a pipe radial direction from hardening material jetting nozzles N1 and N2 of a monitor mechanism 1 assembled to the distal end part of the jetting pipe rod and cutting and agitating surrounding soil by a high pressure jet of the ultrahigh pressure hardening material to perform preparation, the monitor mechanism 1 is pulled up while stopping the monitor mechanism 1 at every predetermined rotation angle θ during one rotation of the monitor mechanism 1 and intermittently rotating it. The two hardening material jetting nozzles N1 and N2 are provided in directions opposite to each other, the axis (a) of one hardening material jetting nozzle N1 and the axis (b) of the other hardening material jetting nozzle N2 are shifted so as not to be parallel to each other, and the shift angle S is set to an angle which is a half of one rotation angle θ of the monitor mechanism 1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
