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

Abstract

The invention provides a reinforced concrete precast pile applicable to permafrost regions and a manufacturing method thereof. The precast pile comprises a precast reinforced concrete hollow pile which is embedded into a permafrost foundation and a refrigerating thermal pipe; the precast reinforced concrete hollow pile comprises a pile body and a pile tip; the pile body comprises an upper pile anda lower pile; the outer wall of the lower pile body is provided with a plurality of heat conduction small holes; the lower pile is embedded into a lower permafrost layer after penetrating through a permafrost table; the evaporation section of the refrigerating thermal pipe is inserted into the inner cavity of the pile body, and the condensation section of the refrigerating thermal pipe extends out of the pile body. The manufacturing method for the precast pile comprises the steps of refrigerating thermal pipe manufacturing, reinforced concrete hollow pile precasting, pile immersing construction, refrigerating thermal pipe assembling, pile tip processing and the like. By adopting the precast pile, the influence to the permafrost layer around the pile by hydration heat generated during a pile concrete consolidation process is avoided; and the temperature of soil around the pile is lowered, and the soil maintains a frozen state.

Description

technical field [0001] The invention relates to the technical field of foundation and foundation engineering, in particular to a 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 in the Qin...

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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