| 摘要 |
PURPOSE:To prevent the lowering of the strength and water imperviousness of the ground by a method in which a hardenig agent and a gelling agent are supplied through the aperture between an inner tube and an outer tube, a quick- setting type gelling agent is injected from the upper hole of the outer tube to form a packer, and a slow-setting gelling agent is injected to the lower part. CONSTITUTION:A stop spring 17 is coupled with the upper face of a cylindrical stopper 22, a boring water is supplied into the aperture 6 and discharged through the second valve 18 and a tip opening 25 from the second hole 8, and under the condition, the ground is excavated. After stopping the supply of the water, a hardening agent is supplied into the inner tube 2 and a gelling agent is supplied into the aperture 6, whereupon a valve 11 does down under the pressure of the hardening agent, the first hole 7 is opened, the thrid valve 16 is closed, the hardening agent and the gelling agent are mixed together up the valve 11, and the mixture is injected into the excavated pit from the first hole 7 to form a packer 41. Then, when stopping the supply of the hardening agent to the inner tube 2, the valve 11 goes up by a pring 14, the gelling agent flows down from the second hole 8, the second valve 18 is pushed down, and the gelling agent is injected from the hole 10 to form a gelled layer 42. |
