Freezer capable of achieving staged freezing and staged freezing method

Abstract

The invention discloses a freezer capable of achieving staged freezing and a staged freezing method. The freezer comprises a liquid distribution ring, a liquid collection ring, a tee joint, a freezingpipe, an upper-section frozen liquid supply and lower-section frozen liquid return pipe, and a lower-section frozen liquid supply pipe. The bottom ends of the upper-section frozen liquid supply and lower-section frozen liquid return pipe and the lower-section frozen liquid supply pipe extend into the freezing pipe along the axis of the freezing pipe, and the upper ends of the upper-section frozenliquid supply and lower-section frozen liquid return pipe and the lower-section frozen liquid supply pipe extend out of the top end of the freezing pipe. The distance between the bottom end of the lower-section freezing liquid supply pipe and the bottom of the freezing pipe is smaller than the distance between the upper-section frozen liquid supply and lower-section frozen liquid return pipe andthe bottom of the freezing pipe. By staged freezing, the demand for chilling requirement can be reduced, the number of equipment in a freezing station can be reduced, the equipment installation work can be reduced, the floor area of the freezing station can be reduced, the civil construction cost of the freezing station can be reduced, and the total freezing cost can be reduced. By staged freezing, the cooling capacity can be rationally used, the freezing of the upper part of a shaft can be accelerated, and the early excavation of the shaft can be achieved.

Description

Technical field [0001] The invention relates to the technical field of a freezing device when sinking a shaft with a freezing method in a coal mine tunnel. Specifically, it is a freezer and method for freezing by stages. Background technique [0002] Freezing sinking 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 alluvial strata, fractured water-bearing rock formations, soft mudstones, and rock formations with particularly high water content and water pressure. It can be used as a regular construction method for mine projects with complex geological conditions, and also as a means of engineering rescue and accident treatment. It is widely used in the construction of vertical shafts, inclined shafts, and horse head gates in coal mine tunnel projects, and has been used in construction Subways, bridges and culverts, large-volume under...

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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