Freezing apparatus with double circulating systems

Abstract

A freezing apparatus with double circulating systems is mainly applied to freezing stratums in mine construction and urban underground engineering. A first liquid supply tube (1), a first liquid return tube (2) and a second liquid supply tube (3) extends into a freezing tube (5), the first liquid supply tube and the first liquid return tube penetrate through a partition board (6) to respectively extend downwards until the first liquid supply tube and the first liquid return tube approach the bottom end of the freezing tube and the lower surface of the partition board, and the lower end of the second liquid supply tube is placed on the upper surface of the partition board. Accordingly, the first liquid supply tube, the partition board, the lower sections of the freezing tube, a lower sealing plate (8) and the first liquid return tube form a lower freezing section which is nearly closed, a circulating system is formed, the second liquid supply tube, an upper sealing plate (7), the upper section of the freezing tube, the partition board and a second liquid return tube (4) form an upper freezing section which is nearly closed, another circulating system is formed, accordingly, the double circulating systems capable of realizing circulation of saline with different low temperatures, flow velocities and flows are formed, cold energy can be supplied to an integral freezing range in a sectioned manner according to difference of heat-conducting properties of the upper and lower stratums, and the stratums are frozen in a customized and intensified manner.

Description

technical field [0001] The invention relates to a freezer for artificial freezing or forced thawing in the fields of mine construction engineering and urban underground engineering, in particular to a double-circulation system freezer, especially suitable for the thermal conductivity and frozen soil of the upper and lower main strata within the entire freezing range. Rock and soil layers with large differences in strength. Background technique [0002] The natural strata are complex and diverse. Some strata such as cohesive soil and mudstone covering the lower part of the deep alluvial layer have the characteristics of low strength and easy rheology, which are slower than other soil layers under the same freezing conditions. The high-stress environment in this formation is contradictory, which affects the safety performance of the frozen wall during the excavation process, and even causes the frozen pipe to break. In addition, although the deep strata in some areas are sub...

AI Technical Summary

Problems solved by technology

The technical problem to be solved is: aiming at the difference in thermal conductivity of the upper and lower strata, to achieve targeted enhanced freezing of the strata; based on the fact that the strength of the frozen soil is closely related to the temperature of the frozen wall, by analyzing the temperature field of the upper and lower frozen walls Optimization can coordinate the relationship between the strength of the frozen soil and the lateral force of the frozen wall, making the force of the frozen wall more reasonable; when taking measures such as changing the brine temperature, flow rate and flow to save energy, the entire freezing range can be adjusted Segmented cold energy supply to achieve stronger ability to regulate cold energy and better energy-saving effect

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