Double-helix grouting type freezing device and construction method

Abstract

The invention provides a double-helix grouting type freezing device and construction method. The double-helix grouting type freezing device comprises a double-helix grouting type freezing pipe, wherein the double-helix grouting type freezing pipe comprises a saline water supply pipe, and an outer pipe sleeving the saline water supply pipe outside; two helical channels are formed between the pipe wall of the saline water supply pipe and the pipe wall of the outer pipe, and separately share the pipe walls with the saline water supply pipe and the outer pipe; one of the helical channels is a saline water helical pipeline; and the other helical channel is a grout helical pipeline. Through the adoption of the double-helix grouting type freezing device and construction method provided by the invention, combination of a grouting and plugging water technology for ground consolidation, and a special artificial freezing construction technology is realized, and the underground pipelines for two construction technologies are arranged in one pipeline, so that the construction method is simplified, and drilling and pipeline cost is reduced.

Description

technical field [0001] The invention relates to the field of artificial ground freezing engineering, in particular to a double-helix grouting type freezing device and a construction method. Background technique [0002] The freezing method is to drill a certain number of freezing holes around the underground space to be excavated before the underground engineering construction. A freezer is installed in the hole, and the low-temperature brine flows in the freezer to absorb the heat of the surrounding strata and loosen the hole. , A frozen cylinder is formed in the water-bearing unstable stratum, and the frozen cylinder gradually expands and connects into a closed cylinder that meets the design thickness and strength—the frozen circle, so as to resist soil and water pressure, isolate groundwater, and pass through the aquifer stratum safely. A special construction method that temporarily reinforces the ground and cuts off groundwater by means of artificial refrigeration. [0...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a double-helix grouting type freezing device and construction method, which can overcome the large amount of cooling loss caused by the flow of water flow when the existing freezing pipe and freezing method construction technology freezes the stratum containing groundwater flow, and the freezing wall is extremely Difficult circles, long freezing period, inability to ensure uniform freezing of the frozen wall, excessive water pressure on the outer well wall after freezing and thawing, and the inability to combine grouting and freezing construction, etc.

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