Deep-hole chemical grouting construction method applied to water leakage treatment of hydroelectric dam

Abstract

The invention relates to the technical field of hydraulic engineering and in particular relates to a deep-hole chemical grouting construction method applied to water leakage treatment of a hydroelectric dam. The method comprises the following steps: (1) arranging, fixing and drilling grout holes in the concrete crack fracture surface and the concrete surface respectively; (2) performing primary grouting by polyurethane; (3) performing secondary grouting by epoxy resin; (4) sealing the holes. According to the method, the technologies of fixing the holes by a similar triangle principle, performing primary and secondary grouting by polyurethane and epoxy grouting materials, grouting in a high-voltage pulse manner, grouting in a high-flow manner and the like are innovatively used, so that the problem of water leakage of the hydroelectric dam is radically solved, the reinforcement effect is achieved, a full guarantee is provided for long-term safe and stable running of the dam, a large amount of materials are saved, the construction efficiency is improved, the project progress is accelerated, and the cost is greatly reduced. Therefore, the method is suitable for popularization and application in the field of water leakage treatment of related parts such as hydroelectric dam cracks and inter-dam cross joints.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a deep hole chemical grouting construction method applied to the treatment of seepage water in a hydropower station dam. Background technique [0002] At present, there are different degrees of water leakage problems in hydropower dams at home and abroad. For this, dense drilling is usually used for curtain cement grouting, or superficial chemical grouting is used for water sealing and leak plugging. There are many disadvantages in the above two processing methods. For example, when the cement curtain grouting method is used, the dense drilling will cause secondary damage to the original dam body and concrete block during the drilling process, and it is easy to break through the original water stop and the embedded parts and lines in the concrete. At the same time, when the cement curtain grouting method is used, due to the coarse cement particles, high-pre...

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Problems solved by technology

For example, when the cement curtain grouting method is used, the dense drilling will cause secondary damage to the original dam body and concrete block during the drilling process, and it is easy to break through the original water stop and the embedded parts and lines in the concrete. At the same time, when the cement curtain grouting method is used, due to the coarse cement particles, high-pressure grouting must be used to make the grouting slurry reach the predetermined diffusion radius, but too high pressure will cause the concrete to be damaged and the grouting pipe to collapse Injury, machine damage and other problems occur; and the cement grouting has low bonding strength with the surrounding substrate, and it is easy to form voids after settlement, resulting in the formation of fine cracks, and the reinforcement effect is unstable

For superficial chemical grouting, polyurethane grouting is generally used for water-stopping and leak-stopping treatment. Its temporary water-stopping effect is obvious, but it is also very easy to cause leakage again, and cannot maintain a stable reinforcement effect; moreover, the reinforcement effect is not comprehensive, which is easy to cause Seepage water leaks in other weak parts in the dam

In general, the existing methods of water sealing and leak plugging can only achieve superficial or partial water sealing, leak plugging and reinforcement effects, and cannot fundamentally solve the problem of water leakage in hydropower dams, let alone achieve long-term stable reinforcement The effect of reinforcement

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