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US 5,396,749 AGranted
Method of cutting off water flow by grouting
AssigneeAsahi Denki Kogyo Kabushiki Kaisha
InventorTakuo Fukushima
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AssigneeAsahi Denki Kogyo Kabushiki Kaisha
InventorTakuo Fukushima
Estimating the term…
There is disclosed a method of cutting off water flow by grouting characterized by injecting a water flow cutoff agent (grout) comprising colloidal silica as the main component, a water flow cutoff agent comprising a water-soluble urethane diluted with water, or a water flow cutoff agent comprising a mixture of the above two kinds of water flow cutoff agents into a water-leaking part or a cavity. Also disclosed is a method of cutting off water flow by grouting characterized by injecting a water flow cutoff agent comprising colloidal silica as the main component into a water-leaking part or a cavity and then injecting thereinto a water flow cutoff agent comprising a water-soluble urethane diluted with water or a water flow cutoff agent comprising a mixture of a water flow cutoff agent comprising colloidal silica as the main component with a water flow cutoff agent comprising a water-soluble urethane diluted with water. The water flow cutoff agents according to the present invention are nonpolluting and provide hardened products having excellent water pressure resistance and durability.
A method for cutting off water flow, said method comprising a step of grouting or injecting a water flow cut-off agent into a water-leaking part or cavity, said agent comprising one or more members selected from the group consisting of (1) colloidal silica and a water-soluble urethane polymer, (2) colloidal silica and an inorganic salt, (3) a colloidal silica dispersion having an average SiO.sub.2 particle size of between 5 and 50 .mu.m and obtained by treating a neutral silica sol to remove alkalis and produce a resultant composition and condensing and concentrating the resultant composition to have a SiO.sub.2 content of 20 to 30 percent by weight, and (4) an aqueous mixture containing 0.5 to 30 percent by weight of a water-soluble urethane polymer and the balance being water.
Dependencies are inferred from the claim text.