Method for improving ground

Abstract

A method for improving ground is capable of improving the strength or quality of an underground consolidated body formed by reducing the ratio of water to a “rich-mixed” solidification material (a cement) (W/C), assuredly carrying the solidification material from a feed source to a jet device, and reducing the amount of solidification material treated as an industrial waste in a construction process. The method for improving ground includes a step of drilling a drilling hole in the ground to be improved, a step of moving (pulling up) a jet device in a vertical direction by rotating the same while the jet device is inserted into the drilling hole and a fluid for cutting the ground (a stable liquid or a partition forming material) is injected from the jet device, and a step of injecting a solidification material from the jet device.

What is claimed is: 
     
         1 . A method for improving ground comprising: a step of drilling a drilling hole in a ground to be improved; a step of moving a jet device in a vertical direction by rotating the same while the jet device is inserted into the drilling hole and a fluid for cutting the ground is injected from the jet device; and a step of injecting a solidification material from the jet device, wherein said step of moving the jet device in a vertical direction by rotating the same while the fluid for cutting the ground is injected from the jet device comprises: a step of cutting the ground by injecting the partition forming material; and a step of injecting a solidification material while the ground is cut by injecting the stable liquid after injecting the partition forming material. 
     
     
         2 . The method according to  claim 1 , wherein the method for improving ground comprising: a step of collecting a mixture of a stable liquid discharged above the ground and a cut soil by a slurry collecting structure; and a step of carrying the slurry collected by the slurry collecting structure to a slurry treating structure and adding a decomposition enzyme from an enzyme feed source. 
     
     
         3 . A method for improving ground comprising: a step of drilling a drilling hole in a ground to be improved; and a step of moving a jet device in a vertical direction by rotating the same while the jet device is inserted into the drilling hole and a fluid for cutting the ground is injected from the jet device, wherein said step of moving the jet device in a vertical direction while the fluid is injected injects zeolite from the jet device.