A freezer capable of realizing staged freezing and a staged freezing method

Abstract

The invention discloses a freezer and a method for freezing in stages, which include a liquid distribution ring, a liquid collection ring, a tee, a freezing pipe, an upper frozen liquid supply pipe, a lower frozen liquid return pipe, and a lower frozen liquid supply pipe. The bottom end of the upper frozen liquid supply pipe and the lower frozen liquid return pipe and the lower frozen liquid supply pipe extend into the inside of the frozen pipe along the axis of the frozen pipe, and the upper frozen liquid supply pipe and the lower frozen liquid return pipe and the upper end of the lower frozen liquid supply pipe protrudes from the top of the frozen pipe; the distance between the bottom end of the lower frozen liquid supply pipe and the bottom of the frozen pipe is smaller than the distance between the upper frozen liquid supply pipe and the lower frozen liquid return pipe The distance from the bottom of the freeze tube. By freezing in stages, it can reduce the amount of cooling required for freezing, reduce the equipment in the freezing station, reduce the amount of equipment installation, reduce the area occupied by the freezing station, reduce the civil construction cost of the freezing station, and reduce the total cost of freezing. The freezing of the upper part of the wellbore is prevented, and the early excavation of the wellbore is realized.

Description

technical field [0001] The invention relates to the technical field of a freezer when sinking a shaft by the coal mine roadway freezing method. Specifically, it is a freezer capable of realizing stage freezing and a stage freezing method. Background technique [0002] Sinking by freezing is a construction method that uses artificial refrigeration technology to temporarily reinforce unstable formations and isolate groundwater. The freezing method is suitable for loose and unstable alluvium, fractured water-bearing rock formations, soft mudstone, and rock formations with particularly large water content and water pressure. It can be used not only as a regular construction method for mine engineering with complex geological conditions, but also as a means of engineering emergency rescue and accident handling. Subway, bridges and culverts, large-volume underground chambers and deep foundation pit projects. [0003] In the freezing method construction, the low-temperature brin...

AI Technical Summary

Problems solved by technology

The long and short leg freezing can realize the early excavation of the wellbore by densifying the freezing holes in the upper parts that need to be frozen; however, when the deep part of the wellbore is frozen, the depth of some frozen holes will be shortened, which is equivalent to reducing the number of frozen holes. Difficult to adjust when finished, no remedy if "open sunroof" occurs in the lower part

[0008] When positive and negative circulation is used, especially when shallow wells are frozen, the temperature difference between the upper and lower strata is not large. Using positive and negative circulation will make the frozen wall thicker at the top and thinner at the bottom, which is unfavorable for early excavation and lower excavation.

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