Winding wire for large-diameter high-pressure flexible composite pipe and using method of winding wire

Abstract

The invention relates to a winding wire for a large-diameter high-pressure flexible composite pipe and a using method of the winding wire, and belongs to the field of fiber-reinforced thermoplastic pipelines. According to the technical scheme, a fiber bundle is wound on an inner core made of a flexible material, and a reinforcing layer of a multi-layer structure is formed after the winding wire is formed; and by changing the included angle between the winding direction of the fiber bundle and the axis of the inner core, the volume ratio of the fiber bundle to the inner core, the included angle between the winding direction of the winding wire and the axis of the pipeline, the twist degree of the fiber bundle and the like in each layer, the relaxation degree of the winding wire of each layer is adjusted, uniform stress of the winding wire of each layer is achieved, and finally the pressure bearing capacity of the fiber-reinforced flexible composite pipeline is improved. The problems that inner-layer fibers of an existing flexible composite pipeline are large in stress, and outer-layer fibers of the existing flexible composite pipeline are small in stress are solved, and the winding wire can be used for large-diameter and high-pressure flexible composite pipelines.

Description

technical field [0001] The invention relates to a winding wire for a large-diameter high-pressure flexible composite pipe and a method for using the same, belonging to the field of pipeline transportation, in particular to the field of fiber-reinforced thermoplastic pipes. Background technique [0002] Reinforced Thermoplastic Pipes (RTP pipe for short) is a high-pressure plastic composite pipe with good flexibility, corrosion resistance, high pressure resistance, impact resistance, wear resistance, light weight, easy connection, and coilable , long-distance non-joint fast laying, etc., can well overcome the corrosion of steel pipes and the pressure resistance of plastic pipes, and can be used in oil and natural gas mining, high-pressure long-distance natural gas transmission, and various mediums that require higher pressure transmission pipeline field. [0003] RTP products are usually composed of three layers, the inner and outer layers are made of PE80, PE100 or above, a...

AI Technical Summary

Problems solved by technology

[0008] Purpose of the present invention: In order to overcome the low pressure bearing capacity of existing fiber-reinforced flexible composite pipes, it is difficult to process them into large-diameter, high-pressure pipes; fundamentally solve the problem of uneven stress on multi-layer fibers of flexible composite pipes, so as to improve fiber Enhancing the pressure bearing capacity of flexible composite pipes

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