Construction method for reinforced carbon fiber cloth composite layer and pipeline crack arrester applying same

Abstract

The invention provides a construction method for a movable reinforced carbon fiber cloth composite layer and a pipeline crack arrester applying the same. The invention mainly aims at providing the pipeline crack arrester which has a relatively strong flexible crack arresting effect on cracks in each direction of a pipeline. The construction method is characterized by comprising the following steps: laying and stacking at least four layers of reinforced carbon fiber cloth with the same shape; after impregnating the reinforced carbon fiber cloth with a binding agent, carrying out curing to form the reinforced carbon fiber cloth composite layer. An included angle is alternately formed between tensile directions of each two layers of the reinforced carbon fiber cloth according to a sequence from top to bottom and the range of the included angle is 15 degrees to 60 degrees; the reinforced carbon fiber cloth at each angle is formed by stacking at least two pieces of the reinforced carbon fiber cloth with the same main fiber direction; and a non-curing belt, which is not impregnated with the binding agent, is remained on the middle section of the reinforced carbon fiber cloth composite layer. The crack arrester constructed by the method provided by the invention can be used for effectively preventing various cracks of the pipeline from being expanded and flexible crack arresting of ductile fracture of the pipeline is realized.

Description

technical field [0001] The invention relates to the field of fracture control of oil and gas transmission pipelines, and mainly relates to a device and a manufacturing method for preventing long-distance expansion of ductile cracks in high-grade pipeline steel pipelines. Background technique [0002] As one of the most important energy resources in my country, natural gas is also a flammable and explosive dangerous medium, and it is mainly transported over long distances by escrow roads. In order to reduce the construction investment of pipeline projects and save steel consumption, gas pipelines in various countries tend to use large-diameter, high-strength, high-grade steel pipelines. At present, high-strength pipeline steel is also widely used in my country. For example, the second line of the West-East Gas Pipeline has fully adopted X80 pipeline steel, and X90 and X100 are also under development. [0003] High-grade pipeline steel has better tensile strength, but due to ...

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Problems solved by technology

[0005] Installing an integral crack arrester on an established pipeline requires cutting and re-welding of the pipeline, which is time-consuming and costly

[0006] Although the steel sleeve crack arrester is considered as a non-integral crack arrester, its own weight and strength are smaller than those of composite materials, and due to the limitation of its structural characteristics, it can only have a good crack arrest effect on axial cracks

Due to the relatively high hardness of the steel sleeve, it is also easy to cause secondary damage to the pipeline during installation

[0007] Although the existing composite material crack arrester has the advantages of light weight and high strength, but because it only adopts the structure of multi-layer winding of unidirectional carbon fiber cloth, it only has enough restrictions on axial cracks and cannot control other cracks well. direction, and because its fabrication and installation must be carried out on site, it has high requirements on the construction environment and installation personnel

The installation process is cumbersome and cannot be mass-produced

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