Method and device for preventing and controlling thawing of buried pipelines in permafrost regions combined with hot rods and coarse-grained soil

Abstract

The invention discloses a permafrost region buried pipeline thaw collapse control method and device with combination of hot sticks and coarse-grained soil and relates to the technical field of pipeline systems. The permafrost region buried pipeline thaw collapse control method is characterized in that silty clay with strong thaw collapse property around a buried pipeline (1) is replaced by the coarse-grained soil with weak thaw collapse frost heaving property, namely, a layer of pebbles (4) without sharp corner angles are paved on the bottom layer, and sand (3) in an inverted trapezoidal shape or sand bags filled with the sand (3) is or are paved above the pebbles (4) and around the buried pipeline (1). After filling replacement is completed, the hot sticks (5) are arranged on the two sides of the buried pipeline (1) vertically. The permafrost region buried pipeline thaw collapse control device is free of movement parts and maintenance and good in reliability, and does not consume electricity.

Description

technical field [0001] The invention relates to a method and device for preventing and controlling the thawing of buried pipelines in permafrost regions by combining hot rods and coarse-grained soil. It relates to the technical field of piping systems. Background technique [0002] With the rapid development of my country's economy, the demand for oil and gas resources is also increasing. As an economical, safe, and uninterrupted long-distance oil and gas transportation tool, oil and gas pipelines have achieved tremendous development in recent decades. However, since many oil and gas resources are stored in permafrost regions, in order to meet the demand for oil and gas resources for economic development, more and more oil and gas pipelines will inevitably be built in permafrost regions. At present, the crude oil pipelines built in permafrost regions at home and abroad are representative of the Alaska pipeline in the United States, the Norman Wells pipeline in Canada and t...

AI Technical Summary

Problems solved by technology

Second, after the permafrost thaws, the mechanical bearing capacity decreases sharply, or even loses the bearing capacity, making it impossible to effectively support the pipeline

Its shortcoming is that it not only consumes a lot of electric energy, does not take advantage of environmental protection and energy saving, but also has high operation and maintenance costs, which is economically unreasonable.

Also, the measure cannot be used in areas without a steady source of electricity

CNY201317935 discloses an anti-frost heaving and thawing device for culverts in the alpine permafrost region, but it is not ideal, and the application environment is not the same

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