A method and device for preventing pipe thawing in permafrost regions by using foam materials
A foamed material, technology in frozen soil area, applied in pipeline laying and maintenance, pipe/pipe joint/pipe fittings, mechanical equipment, etc., can solve problems such as excessive electrical energy, loss of bearing capacity, reduction of mechanical bearing capacity, etc.
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[0080] EXAMPLE This example is used to illustrate the specific implementation of the present invention and further illustrate the present invention. In this example, polyurethane foam material is used to increase the local contact area between the pipeline and the permafrost, thereby improving the buoyancy of the pipeline in the permafrost swamp area to prevent the thawing problem of a buried crude oil pipeline in the permafrost swamp area. According to the geological survey results, it is found that this section is a permafrost swamp area, and the pipeline is directly laid on the silty clay layer with strong thawing property. The thickness of the clay layer is greater than 10m, and the thawing coefficient is greater than 10. 40%, the buoyant density after thawing permafrost is 910kg / m 3 , belongs to the strong melting subsidence area. The pipeline in this section is made of X65 steel, with a pipe diameter of 813mm, a pipe wall thickness of 16mm, a buried depth of 1.8m at the...
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