A kind of plugging method and structure for karst pipeline

Abstract

The invention discloses a leaking stoppage method and structure for a karst pipeline. According to the method and structure, soybeans (4) and quick-setting mortar (3) are mixed, stirred, wrapped in a film bag (2) and then placed in an inlet of a leakage point of the karst pipeline (1); the soybeans (4) make volume in the film bag (2) be expanded by utilizing the expansibility of itself before solidification of the quick-setting mortar (3); the quick-setting mortar (3) quickly solidifies while the volume of the film bag (2) is expanded; after the quick-setting mortar (3) solidifies, the film bag (2) is tightly attached to the periphery of the karst pipeline (1) to produce friction and stops flowing, and therefore the leakage stoppage purpose for the karst pipeline (1) is achieved. The leaking stoppage method and structure are low in construction technical difficulty, simple in construction procedure, low in investment and capable of achieving a good leakage stoppage effect and being widely applied and popularized in the technical field of leakage stoppage of the karst pipelines.

Description

technical field [0001] The invention relates to a plugging method for karst pipelines and a film bag type plugging structure, belonging to the technical field of water conservancy and hydropower engineering. Background technique [0002] At present, in hydropower projects in Guizhou, Guangxi and other regions, when the water-retaining buildings are located on limestone foundations, limestone often develops more karst pipelines. In order to prevent leakage of karst pipelines, karst pipelines are generally protected. seepage grouting, and chemical grouting when the karst pipeline cavity is large. When anti-seepage grouting is adopted, thick mortar or fine stone concrete is generally injected into karst pipelines through grouting equipment. After the concrete is poured into the karst pipeline, it is diluted by water seepage, and the thick mortar or fine stone concrete is difficult to solidify in a short period of time, and its main component, cement, is taken away by water see...

AI Technical Summary

Problems solved by technology

When anti-seepage grouting is adopted, thick mortar or fine stone concrete is generally injected into karst pipelines through grouting equipment. After the concrete is poured into the karst pipeline, it is diluted by water seepage, and the thick mortar or fine stone concrete is difficult to solidify in a short period of time, and its main component, cement, is taken away by water seepage. Even if some fine stones are left in the karst pipeline, it is still difficult to achieve The purpose of plugging; when the cavity of the karst pipeline is large and the seepage velocity is high, chemical grouting is generally used. The grouting materials include water glass, acrylate, water-soluble polyurethane, elastic polyurethane and lignin pulp, etc. The leakage effect is good, but the grouting materials are expensive, and the chemical grouting construction technology is difficult, the construction process is complicated, chemical poisoning is easy to occur during the grouting process, and the safety risk is great

Therefore, the existing karst pipeline plugging measures are not ideal enough

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