| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for improving divided ground including unimproved ground. <P>SOLUTION: On a peripheral surface of a rod distal end, in order to jet a hardener liquid by a high pressure at a prescribed angle in a circumferential direction, a first nozzle 2 is arranged downwards on a rod axial direction ground hand side and a second nozzle 3 is arranged upwards on a rod axial direction underground distal end side, keeping such a distance that the hardener liquids jetted from the first nozzle 2 and the second nozzle 3 are not brought into contact with each other at the same time and at the same spot. By mixing the hardener liquid into the ground by the high pressure from the first nozzle 2 and the second nozzle 3 while axially rotating a rod 1 at the prescribed angle in one circumferential direction at a prescribed depth, a dish-like first nozzle planar improvement body 51 and a second nozzle planar improvement body 52 inclined at the prescribed angle respectively are formed simultaneously. Also, the first nozzle planar improvement body 51 and the second nozzle planar improvement body 52 are crossed and connected with each other with a short time difference on a prescribed radius circumference in the circumferential direction centering on the rod 1, an improvement area 61 in an abacus bead shape containing unimproved ground 71 is formed, and thus the ground of a prescribed area is divided. <P>COPYRIGHT: (C)2013,JPO&INPIT |
