Method of improving ground and apparatus used therefor
AssigneeNitto Chemical Industry Co., Ltd.
InventorsMitsuji Ishida, Tomohiro Sakurada, Katsuhiko Kurihara, Takashi Miki, Goro Murai
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Abstract
A method of improving water retention characteristics of soil by using water absorption polymer, including the steps of forming a water impermeable layer in a subsurface layer of the ground, and providing a water absorption polymer layer in an upper region of the water impermeable layer. The method is executed by an apparatus for forming a water impermeable layer in a subsurface layer of the ground, the apparatus also being used to mix water absorption polymer in the soil in an upper region of the water impermeable layer, by an injecting apparatus having a drilling function.
Claims9
A method of improving the water retention characteristics of soil in dry ground with a water absorption polymer, comprising the steps of
- forming a water impermeable layer below a surface of the ground at a selected location;
- and
- mixing a water absorption polymer in the soil above an upper portion of said water impermeable layer.
An apparatus for improving the ground by forming a water impermeable layer at a subsurface level of the ground and for mixing a water absorption polymer in soil above an upper portion of said water impermeable layer, comprising:
- an injection tube, inserted into the ground to a predetermined depth, having at least two independent passages provided therein to enable respective flows therethrough, wherein
- one end of a first passage of said independent passages has an opening to a side for sidewise direction of injecting of a first material therethrough into the ground,
- one end of a second passage of said independent passages is opened to a side for injecting of a second material therethrough at a position near a base end of the injecting tube at a distance of at least 0.7 m from said opening of the first passage;
- agitating wing means projecting sidewisely is provided near the opening of the second passage, for agitating adjacent soil;
- and
- a power mechanism for rotating and vertically moving the injection tube with respect to the ground.
Dependencies are inferred from the claim text.