Novel refrigeration circulation pipe system, regulation and control method and application

Abstract

The invention belongs to the technical field of artificial freezing of urban underground space, and discloses a novel refrigeration circulation pipe system, a regulation and control method and application. In a refrigeration circulation pipe, a refrigerating medium rapidly circulates in a pipe by utilizing the height difference of different pipe diameters and the pressure difference caused by an inner pipe structure and an outer pipe structure. A refrigerant liquid inlet pipe channel sleeves the inner side of the upper end of a refrigerant liquid outlet circulation channel, the refrigerant liquid inlet pipe channel is provided with a liquid inlet pipe, and the upper end of the liquid inlet pipe communicates with a liquid inlet; and the upper part of the outer side of the refrigerant liquid outlet circulation channel communicates with a liquid outlet, and the lower end of the refrigerant liquid outlet circulation channel is connected with a plug in a hot melting manner. Compared with a traditional seamless steel pipe-type refrigeration circulation pipe and other refrigeration circulation pipes, circulation is rapid and sufficient, cold brittleness is good, pollution to the underground environment is low, the cost is low, the repeated utilization rate is high, the arrangement form can be flexibly changed, and a freezing pipe is simple in structural form; field installation and operation can be facilitated in engineering; and the engineering cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of artificial freezing of urban underground space, and in particular relates to a novel refrigeration circulation pipeline system, a control method and an application thereof, which are suitable for temporary support engineering in deep foundation pit engineering. Background technique [0002] At present, the technology of artificially freezing deep foundation pits in the soil layer is to use the characteristics of high soft soil content, insert freezing pipes into the soil around the site to be excavated, and form a soil with a certain structural strength by freezing the soil, so as to This is used as the enclosure structure for foundation pit construction. At present, many foundation pits constructed by conventional support methods in China have experienced collapse and instability accidents to varying degrees. The frozen wall constructed by artificial freezing has dual functions of structural strength and...

AI Technical Summary

Problems solved by technology

[0004] (1) The toughness of existing refrigeration cycle pipelines decreases at negative temperatures, and they are prone to brittleness at low temperatures, and steel is easily corroded and rusted, which will not only pollute the soil, but also pollute the refrigeration medium to weaken the freezing effect

[0005] (2) Once the arrangement of the original seamless steel pipe refrigeration cycle pipeline is welded, the form cannot be changed at will, and the construction procedure is complicated, which is not convenient for on-site splicing and installation

[0006] (3) The liquid inlet pipe and the liquid outlet pipe of the traditional cryogenic tube are two different inner pipes arranged side by side in the structure, and the refrigerant medium needs a lot of pressure to flow out from the liquid outlet, so the power requirement for the cryogenic cycle machine is relatively high. High, and the heat exchange effect with the soil is not good in the process of outflow

[0007] (4) The traditional freezing tube has a single form and is connected to a refrigeration cycle system by welding stainless steel pipes on the upper part. During the connection process, the upper stainless steel pipe needs to be drilled, and the operation is complicated

[0009] (1) In foundation pit tunnel engineering and other underground engineering, the prevention and control of underground pollution caused by construction has become a key concern in the construction process. The procedure is complicated, the installation of the frozen pipe is complicated, and seamless steel pipe and other materials need to be sheared and welded, which is difficult and complicated to operate

[0010] (2) The traditional form of freezing tube requires a large power of the circulation pump of the refrigeration cycle machine, and the voltage may not reach the specified voltage of the refrigeration cycle machine during on-site construction

[0011] (3) The cold exchange of traditional freezing tubes is insufficient, requiring a large number of freezing tubes and a long time to form

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