Leaking stoppage grouting method for cracks under high pressure flowing water state

Abstract

The invention relates to the technical field of grouting repairing of concrete cracks of a hydraulic building, in particular to a leaking stoppage grouting method for cracks under a high pressure flowing water state. The method comprises the following steps: processing the cracks, drilling, configuring grout, grouting and ending. The method according to the invention adopts a construction method of grouting one hole and depressurizing peripheral holes, the condition that contact cracks between the cracks and surrounding rocks cannot be entered by adopting a conventional means is changed, and grout can enter into the contact cracks to be settled and solidified smoothly, such that the leakage cracks are closed and the aim of leaking stoppage of the cracks is realized; the method according to the invention adopts a cement-base slurry material adopting taking a mixed material of cement slurry, gypsum powder and silicon powder as a main agent, when the grout enters into the contact cracks between the concrete and the surrounding rocks, due to the characteristics of slow flow speed and fake solidification of the grout, water seepage pressure cannot discharge the grout after the grout enters into the contact cracks, such that such type of slurry material can be quickly settled and solidified, and the aim of leakage stoppage of the cracks is realized.

Description

Technical field [0001] The invention relates to the technical field of concrete crack grouting repair for hydraulic structures, in particular to a crack plugging and grouting method under high pressure and dynamic water conditions. Background technique [0002] The crack grouting method is mainly used for the repair of concrete cracks that affect the integrity of the structure or require anti-seepage. Pressure equipment is used to press the cementing material into the cracks of the concrete. After the cementing material is hardened, it forms a whole with the concrete, thereby sealing The purpose of blocking reinforcement. Commonly used cementing materials are cement paste, epoxy resin, methacrylate, polyurethane and other chemical materials. [0003] Concrete crack grouting is usually carried out by drilling buried pipes or drilling buried nozzles. According to the thickness and crack depth of the concrete structure, the method of drilling is usually used to arrange the inclined h...

AI Technical Summary

Problems solved by technology

[0006] 1. The seepage pressure of construction joints and cold construction joints is high, but the amount of grouting injection is not large. After grouting, the phenomenon of water leakage on the joint surface still exists, and the treatment effect is not obvious; 2. When the leakage point is drilled and grouted, once the pressure reaches the specified grouting pressure , significantly increased micro-leakage small cracks were found around the grouting holes, and water seepage also appeared in cold construction joints; 3. The seepage pressure at the seepage point is high, and the grouting pressure slightly higher than the water head is still not effective for grouting, and some holes are even basically No grout suction; 4. Because the thickness of the tunnel lining is only 0.6m, the grouting pressure is too large, exceeding 0.75Mpa, and new water seepage points continue to increase, which poses a safety threat to the construction personnel in the tunnel at a depth of about 70m underwater. Once the tunnel is hit 5. The method of anchoring the steel plate to reinforce and close the lining hole section was used for grouting, but water seepage still occurs around the steel plate, and no effective sealing cracks can be formed.

If this plan succeeds in sealing the leaking water, it will cause pressure water in the concrete cracks, which will seriously affect the service life of the lining concrete. This plan is only an expedient measure to seal the cracks