Grouting structure and grouting method for ground surface ultra-deep hole double liquid slurry grouting

Abstract

The invention discloses a grouting structure and grouting method for ground surface ultra-deep hole double liquid slurry grouting. The structure is characterized by comprising a drill hole opened in the ground surface. A sleeve valve pipe is arranged in the drill hole. A blocking device is arranged in the sleeve valve pipe. A sealed mixing cavity is formed between the blocking device and the sleeve valve pipe bottom. A first grouting pipe and a second grouting pipe are arranged in the drill hole, and communicated with the mixing cavity. The inner wall of the mixing cavity is provided with grouting holes. The parts of the sleeve valve pipe, which correspond to the grouting hole, is bound by a leather sheath which blocks the grouting hole. The blocking device is used for sealing, and an enclosed mixing cavity is formed, thus cement slurry and sodium silicate paste are injected into the mixing cavity through the first grouting pipe and the second grouting pipe respectively to be mixed. Because the cement slurry and the sodium silicate paste are mixed at the bottom of the sleeve valve pipe, the time for mixing used in the re-transportation process is saved. Therefore, with the technical scheme, in a deeper drill hole, mixed slurry has more sufficient time to overflow from the grouting hole, and the requirement of deeper grouting can be met.

Description

technical field [0001] The invention relates to the field of double-liquid grouting, in particular to a grouting structure and a grouting method for double-liquid grouting in super-deep holes on the surface. Background technique [0002] At present, when the grouting material used for surface grouting in geotechnical engineering is cement water glass double grout, the two grouts are first mixed in the ground mixer during the construction process, and then the mixed grout is injected into the formation, such as the announcement The Chinese patent No. CN205314085U discloses a two-liquid grouting system for cement and water glass solution, including pipe A, pipe B and pipe C; pipe A is a sleeve valve pipe for injecting cement slurry; pipe B is used for The water glass is injected, and the C pipe is used to inject the casing material mud; the A pipe is arranged with multiple groups of A pipe grout holes according to the formation conditions, and each group of A pipe grout holes ...

AI Technical Summary

Problems solved by technology

[0003] However, since the double grout is mixed in advance and then injected into the borehole, the setting time after the double grout is mixed is very short, which limits the depth of surface grouting

At present, the depth of surface grouting can only be kept between 20 and 30m, and in some cases, the depth of grouting needs to reach more than 40 meters, which cannot meet the requirements and has certain limitations.

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