A grouting method for water-cutting curtain inside seepage concrete

Abstract

The invention relates to a method for water interception curtain grouting in leakage hydraulic concrete, and belongs to the technical field of hydropower station mass concrete grouting. At first, hole site lofting and in-position of equipment are carried out, then drilling is conducted in a row separation, order separation and subsection mode, joint washing of wind and water in holes and a simple water pressure test are carried out, the wind is blown to drive the water, cement grouting in a row separation, order separation and subsection mode can be conducted, meanwhile lifting observation is carried out, and finally the holes are sealed, drilling and core taking of inspection holes are conducted, and inspection and acceptance are conducted through an acoustic wave test, camera shooting in the holes, the water pressure test and the like. The method is suitable for leakage grouting processing generated due to concrete interlayer joints, concrete defects and other reasons.

Description

technical field [0001] The invention belongs to the technical field of large-volume concrete grouting in hydropower stations, and relates to a water-cutting curtain grouting method inside leaking concrete. Background technique [0002] At present, leakage of hydraulic concrete is one of the common defects. The main reasons are: unreasonable structural design, improper design or use of concrete mix ratio, irregular construction technology, poor quality, illegal operation, poor management, use or Changes in service conditions, damage by external loads or aging of materials, etc. [0003] The existence of concrete leakage will cause a large osmotic pressure inside the building, and sometimes even affect the safety and stability of the building. One of the mechanisms of seepage damage to concrete is: long-term water seepage will dissolve Ca(OH)2 in cement stones, the internal voids of concrete will increase, the structure will be loose, and the strength will decrease. The seco...

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Problems solved by technology

[0004] In the past, the problem of dam concrete leakage was usually solved by emptying the reservoir water and painting the surface with anti-seepage materials, which often only solved the dam surface above the dead water level, and the dam body leakage problem below the dead water level required emptying the dam storage. Water can only be treated, which will affect the continuous operation of the power station and bring economic losses at the same time

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