Construction method of stirring and swing jet grouting combined type cement soil diaphragm wall

Abstract

In order to solve the problems that a diaphragm wall construction method is low in efficiency, cannot guarantee the quality and the like, the invention provides a stirring and swing jet grouting combined type cement soil diaphragm wall construction method. The stirring and swing jet grouting combined type cement soil diaphragm wall construction method is on the basis of a stirring and swing jet grouting pile machine; the stirring swing jet grouting pile machine comprises a drill rod, a drill bit and a rotary swing power head, wherein the drill bit is fixedly connected to the lower part of thedrill rod, and the rotary swing power head is used for driving the drill rod to rotate and swing; the drill bit is provided with a first stirring rod and a second stirring rod which are distributed with one under the other; the first stirring rod is longer than the second stirring rod; a first nozzle and a second nozzle are arranged at the outer ends of the first stirring rod and the second stirring rod respectively; and a slurry conveying pipe communicating with the first nozzle and the second nozzle is arranged in the drill rod. According to the stirring and swing spray jet grouting combinedtype cement soil diaphragm wall construction method, as a single wall section is formed at one time by adopting a construction method of drilling stirring and drill lifting swing spray grouting, thepre-drilling procedure is omitted, the construction process and the construction method are simplified, the construction efficiency is improved, and the construction cost is reduced; and compared withtraditional single-shaft and double-shaft stirring piles, the stirring and swing spray jet grouting combined type cement soil diaphragm wall construction method has the advantages that the number ofconnectors is greatly reduced, and the anti-seepage water stop effect is good.

Description

technical field [0001] The invention relates to the technical field of building foundation pit support anti-seepage walls, in particular to a construction method for a combined cement-soil anti-seepage wall with stirring pendulum spraying. Background technique [0002] At present, there are two main techniques for cement-soil cut-off walls in the market, one is the mixing method, and the other is the rotary spraying method. The existing pendulum spraying process, because the wall formed near the injection hole is too thin, the deformation resistance and reliability are poor, especially for the foundation pit support cut-off wall project that is more sensitive to deformation, it will be damaged due to the slope. The avoided deformation will cause the wall to break and cause water leakage accidents, which can hardly be used in the anti-seepage engineering of foundation pits. Although the single-axis or double-axis stirring pile method is relatively low in cost, it is difficul...

AI Technical Summary

Problems solved by technology

The existing pendulum spraying process, because the wall formed near the injection hole is too thin, the deformation resistance and reliability are poor, especially for the foundation pit support anti-seepage wall project that is more sensitive to deformation, it will be damaged due to the slope. The avoided deformation will cause the wall to break and cause water leakage accidents, and it is almost impossible to use it in the anti-seepage engineering of foundation pits

The single-axis or double-axis stirring pile method, although the cost is relatively low, but due to too many joints, the verticality is not easy to guarantee, and the deviation of the lower lap joint size often leads to water leakage and the failure of the water stop

The construction equipment of the anti-seepage wall of the three-axis mixing method is heavy, and the requirements for the construction site conditions are relatively high.

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