A kind of anti-floating anchor construction method

Abstract

The invention discloses an anti-floating bolt construction method, which successfully solves the problem of high-pressure flowing rich water by adopting the method of forming holes with steel casings and grouting with multi-section grouting pipes, and adopting the method of batching and intermittent grouting of cement grout. The problem of hole formation and grouting of the anti-floating anchor in the layer ensures the pull-out resistance of the anti-floating anchor and overcomes the defects of the prior art; 5-7 days after the grouting of the anchor is completed, it is adopted around the anchor. The method of strengthening the sand egg layer by rotary jet grouting increases the friction between the anchor rod and the surrounding soil, and then improves the pull-out force of the anti-floating anchor rod so that it can reach the pull-out force required by the design. At the same time, this method can also consolidate the loose layer of sand and pebbles around the anchor rod tightly, block the flowing water in the sand and pebble layer, and solve the problem of water rising.

Description

technical field [0001] The invention relates to a construction method for an anti-floating anchor, in particular to a construction method for an anti-floating anchor that passes through a flowing water-rich high-pressure sand pebble layer. Background technique [0002] Anti-floating anchor refers to the general term for various pile types that resist the upward displacement of buildings. Anti-floating anchor is related to the level and change of groundwater level. [0003] The traditional construction of the anti-floating anchor adopts the double grouting method. The first grout is cement mortar, and the second grout is pure cement grout. Both the grout pipe and the grout injection pipe extend to the bottom of the anchor hole. Wherein the main purpose of the second grouting is to fill the borehole with the second grouting at the pressure specified in the design after the first grouting body is solidified. The conventional construction process is: bolt production→bolt posit...

AI Technical Summary

Problems solved by technology

[0005] 1. During the drilling process, the water-rich sand and pebble layer is easy to collapse the hole, resulting in the following two problems: first, the drill pipe cannot be pulled out, and the anchor hole cannot be formed; second, even if the drill pipe is drilled to the design depth, After pulling out the drill pipe, because the pebble layer is easy to collapse and block the hole again, the anchor rod reinforcement cannot be completely lowered into the anchor rod hole, and the length of the anchor rod cannot meet the design requirements;

[0006] 2. When the drill pipe passes through the high-pressure flowing water-rich layer, it is easy to form piping, the water flow is continuous and the pressure is high. When the traditional grouting method is used, the cement slurry is washed away by the piping water, and the quality of the anchor grouting cannot be guaranteed; the grouting is completed Finally, the high-pressure water flows up through the surroundings of the anchor grouting body, seriously affecting the waterproof construction quality of the bottom plate, and causing a large leakage hidden danger in the bottom plate;

[0007] 3. In the water-rich sand and pebble layer, due to the change of water level, the pullout resistance of the bolt cannot be effectively guaranteed

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