A threaded reinforced concrete prefabricated pile suitable for permafrost regions and its manufacturing method

Abstract

The invention provides a threaded reinforced concrete prefabricated pile suitable for a permafrost region and a manufacturing method thereof. The threaded reinforced concrete prefabricated pile comprises a prefabricated threaded reinforced concrete hollow pile body and a refrigeration heat-pipe which are embedded in a permafrost foundation. The prefabricated threaded reinforced concrete hollow pile body comprises a pile main body and a pile tip. The pile main body comprises an upper pile and a lower pile. A spiral blade is arranged on the outer circumferential wall of the lower pile. A plurality of heat-conducting small holes are formed in the spiral blade. The lower pipe penetrates through the permafrost upper limit and then is embedded in permafrost on the lower portion. An evaporation section of the refrigeration heat-pipe is inserted into an inner cavity of the pile body, and a condensation section of the refrigeration heat-pipe stretches out of the pile main body. The manufacturing method of the prefabricated pile comprises the steps of manufacturing of the refrigeration heat-pipe and the prefabricated threaded reinforced concrete hollow pile body, pile-sinking construction, mounting of the refrigeration heat-pipe, treatment of the pile head and the like. According to the threaded reinforced concrete prefabricated pile suitable for the permafrost region, the influence of hydration heat generated in the solidification process of concrete in the pile main body on the permafrost foundation around the pile is avoided, the temperature of soil masses around the pile is decreased, and the frozen state is kept.

Description

technical field [0001] The invention relates to the technical field of foundation and foundation engineering, in particular to a threaded reinforced concrete prefabricated pile. Background technique [0002] Permafrost refers to layers of earth and rock that remain frozen for many years. It can be divided into upper and lower layers: the upper layer melts every summer and freezes in winter, which is called the active layer or the thawed layer; the lower layer is in a frozen state all the year round, called the permafrost layer or the permafrost layer. The distribution area of ​​permafrost in my country is relatively wide, about 2.15 million square kilometers. According to different geographical locations, it can be divided into high-latitude permafrost and high-altitude permafrost. High-latitude permafrost is mainly concentrated in the Greater and Lesser Khingan Mountains, covering an area of ​​380,000 to 390,000 square kilometers. High-altitude permafrost is distributed i...

AI Technical Summary

Problems solved by technology

However, in permafrost areas, the application of pile foundations needs to solve the following problems: (1) During the construction of pile foundations, the permafrost around the piles is likely to melt, making the bearing capacity of the foundation soil significantly reduced or even lost; (2) After the pile foundation construction is completed, the soil around the pile will take a long time to freeze, so that the bearing capacity of the pile foundation will take a long time to gradually reach the design value, and the construction time of the superstructure has to be postponed; (3) After the project is completed, due to the pile foundation The thermal conductivity of the pile reduces the upper limit of the permafrost around the pile, further reducing the bearing capacity of the pile foundation

[0004] For the above three problems, the existing solutions only try to reduce the severity of the consequences of the problems, and have not formed a good solution

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