| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a displacement reducing ground improvement method capable of improving a low displacement performance without increasing a water-cement ratio, reducing a discharge mud amount and a cement additive amount and lowering costs. <P>SOLUTION: In the displacement reducing ground improvement method, a rotary shaft 5 including an excavating and agitating blade 7 and an agitating blade 15, etc., is made to penetrate a ground W while being rotated, solidification material slurry S mixed with compressed air A is discharged in a mist form from a discharge port 8 provided on the excavating and agitating blade 7, excessive mud in an agitation area in the ground W is pushed up onto the ground and discharged together with the compressed air corresponding to the supply amount of the discharged solidification material slurry S, and displacement around an improvement area in the ground is reduced. Cement slurry S is used as the solidification material slurry, a cement admixture P as a delayed water-reducing agent is added to the cement slurry S, and the cement slurry S into which the cement admixture P is added and the compressed air A is mixed is injected/sprayed in the mist form to the entire improvement area of the ground W to improve the ground. <P>COPYRIGHT: (C)2012,JPO&INPIT |
