A liquid nitrogen freezer with partitions in liquid supply pipes and its working method

Abstract

The invention provides a liquid nitrogen freezing device with a liquid supply pipe with partition plates and a method. The liquid nitrogen freezing device is used for water seal and reinforcement of soil on a freezing section during construction of a quick emergency freezing method. The liquid nitrogen freezing device comprises a freezing pipe base cone, the liquid supply pipe and a gas outlet pipe, wherein the transverse partition plates are arranged on the liquid supply pipe at intervals, liquid spraying holes are formed in the portions, between the partition plates, of the liquid supply pipe, the positions between the transverse partition plates are filled with different gap materials, and deformable spring support bases are arranged at the outer edges of the transverse partition platesat intervals. The liquid supply pipe can be easily inserted into a freezing pipe for construction, moreover, it can be ensured that the liquid supply pipe is in the center of the freezing pipe, the consistency of the annular space around the liquid supply pipe is ensured, and gasified nitrogen is discharged from the annular spaces between the transverse partition plates and the freezing pipe. Inthe freezing process, liquid nitrogen is reasonably distributed in different transverse spaces according to freezing requirements, therefore, a freezing wall meeting the design requirements is formed,and the aims of improving the freezing quality, saving the using amount of the liquid nitrogen and reducing the frost-heave capacity are achieved.

Description

technical field [0001] The invention relates to a liquid nitrogen freezer and a working method thereof, and is particularly suitable for a liquid nitrogen freezer with a partition plate in a liquid supply pipe and a working method thereof for sealing water and reinforcing the frozen section soil in the construction of a rapid emergency freezing method . Background technique [0002] The artificial freezing method uses artificial refrigeration technology to freeze the water in the formation, turn the natural rock and soil into frozen soil, increase its strength and stability, and isolate the connection between groundwater and underground engineering, so that construction can be carried out under the protection of the frozen wall. There are two commonly used freezing methods, one is brine freezing and the other is liquid nitrogen freezing. Both methods have their own advantages and disadvantages. Liquid nitrogen quick freezing is often used in emergency construction. Using li...

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Problems solved by technology

Due to the small size of the liquid supply pipe inside the freezing pipe, the position inside the freezing pipe cannot be accurately controlled, so it is difficult to control the distribution of liquid nitrogen inside the freezing pipe and the gasification process, and the development of the frozen soil around the freezing pipe cannot be precisely controlled, resulting in liquid The uniformity of the frozen wall formed by nitrogen freezing is poor

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