Local difference freezing pipe capable of controlling freezing section and applied to freezing construction

Abstract

The invention relates to the technical field of artificial stratum freezing method construction of underground engineering, in particular to a local difference freezing pipe capable of controlling a freezing section and applied to freezing construction. The freezing pipe comprises an upper control freezing section, a lower control freezing section, a partition device, a liquid inlet pipe, a liquid return pipe and a control valve; and different valves are controlled, and the flowing path of low-temperature refrigerant in the freezing pipe is controlled. According to the local difference freezing pipe, selective freezing can be achieved, the defect that a traditional freezing pipe can only conduct whole-section freezing is overcome, controlled freezing of stratums with different layer depths can be achieved, the freezing efficiency of the freezing pipe is improved, a freezing area and the freezing section can be controlled, various construction requirements and engineering actual working condition requirements are met, and the working efficiency is improved. The local difference freezing pipe has the outstanding characteristics of being easy to operate, high in construction practicability, excellent in economical efficiency and the like, and has high application and popularization value.

Description

technical field [0001] The invention relates to the technical field of artificial ground freezing method construction for underground engineering, and more specifically, relates to a locally differential freezing pipe with controllable freezing sections applied in freezing construction. Background technique [0002] The freezing method is to use artificial refrigeration technology to freeze the water in the formation, turn the loose water-bearing rock and soil into frozen soil, increase its strength and stability, and isolate groundwater so that underground engineering excavation can be carried out under the protection of the frozen wall. . It is a physical reinforcement method for the soil layer and a temporary reinforcement technology. When the project needs it, the frozen soil can have rock-like strength. If the reinforcement strength is not needed, it can be melted by forced thawing technology. Its construction method first drills holes in the water-bearing soil layer a...

AI Technical Summary

Problems solved by technology

This method can only freeze the entire section, but cannot control the frozen section, and is not suitable for special engineering construction conditions

[0004] Even if the outer wall of the freezing pipe is wrapped with insulating material or the inner layer is vacuumed, a large amount of cooling capacity will be wasted, which will greatly increase the amount of circulating cold medium and the energy consumption of construction machinery, and it will not solve the problem of segmented and layered freezing. question

[0005] None of the above methods can solve the problem of layered differential freezing. For each project, the non-frozen part of the frozen pipe must be redesigned, which will cause a lot of waste of later materials.

At the same time, it will affect the construction progress of the project, and the construction accuracy is difficult to guarantee

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