A liquid nitrogen freezer with a partition plate on a freezing tube and a construction method

Abstract

The invention discloses a liquid nitrogen freezing device with a freezing pipe provided with partition plates and a construction method. According to construction adopting a quick rescuing freezing method, soil masses of the freezing section are subjected to water shutoff and reinforcing for using. The freezing device is composed of a joint of the freezing pipe, a liquid supplying pipe and a gas exhausting pipe, the joint of the freezing pipe is composed of a two freezing pipe sections and annular partition plate through welding, deformable elastic supporting bases are arranged on the inner edge of the partition plate at intervals, and it is ensured that the liquid supplying pipe is located in the center of the freezing pipe. Liquid spraying holes are formed in the portions, within a section range needing freezing, of the liquid supplying pipe, sprayed liquid nitrogen is gasified, absorbs heat, and achieves refrigeration in space between every two partition plates, and therefore the freezing wall is formed outside the freezing pipe. Hole formation is not conducted on the portions, within a range not needing freezing, of the liquid supplying pipe, lower gasified nitrogen is exhausted along the liquid supplying pipe and an annular space between every two partition plates, therefore interval freezing of different positions within a freezing depth range is achieved, and the freezing wall required for construction is formed. The freezing pipe construction method is simple, the using amount of liquid nitrogen can be saved, the frost-heave amount is reduced, and the special construction requirement is met.

Description

technical field [0001] The patent of the present invention relates to a liquid nitrogen freezer with partitions on the freezing pipe and its construction method, especially suitable for the freezing pipe with partitions used in the construction of the rapid emergency freezing method to seal water and reinforce the frozen section of soil. Liquid nitrogen freezer and construction 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 construction methods, one is salt water freezing, and the other is liquid nitrogen freezing. Both methods have their own advantages and disadvantages. Liquid nitrogen quick freezing is ofte...

AI Technical Summary

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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