Steel pipe with integrated connecting structure

Abstract

The invention discloses a steel pipe with an integrated connecting structure, and belongs to the field of steel pipes. According to the steel pipe with the integrated connecting structure, through the arrangement of a plurality of inner convex rings and outer convex rings at the two ends of the steel pipe, during connection, a pre-sealing cavity can be formed between an outer sealing end and an inner sealing end, and then molten plastic liquid is injected, so that an an integrated limiting layer filled with the concave inner convex rings and the convex outer convex rings is formed in the pre-sealing cavity, and sealing and fixing are achieved. Compared with the prior art, the stability of the connecting position can be effectively guaranteed, transverse movement of two steel pipes at the connecting position is effectively avoided, meanwhile, the limiting layer is not subjected to extrusion force, the aging speed is greatly reduced, and the service life is obviously prolonged; and in addition, in cooperation with the action of a self-extension bundle, the self-extension bundle automatically extends outwards and expands under the high-temperature action when the molten plastic liquid is injected, the self-extension bundle can serve as a lining, the strength and stability of the limiting layer are remarkably improved, and the limiting layer is not prone to loosening when accidental stress is borne.

Description

technical field [0001] The invention relates to the field of steel pipes, more specifically, to a steel pipe with an integral connection structure. Background technique [0002] A steel pipe is a steel material with a hollow section whose length is much greater than its diameter or circumference. According to the cross-sectional shape, it can be divided into circular, square, rectangular and special-shaped steel pipes; according to the material, it can be divided into carbon structural steel pipes, low alloy structural steel pipes, alloy steel pipes and composite steel pipes; Steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high pressure equipment, etc. [0003] Existing steel pipes are usually connected by welding or sealed connections through connectors, but the operation of welding is cumbersome, and the joints are prone to cracking when impacted by external forces, resulting in reduced strength. Because the sealed...

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Problems solved by technology

[0003] Existing steel pipes are usually connected by welding or sealed connections through connectors, but the operation of welding is cumbersome, and the joints are prone to cracking when impacted by external forces, resulting in reduced strength. Because the sealed rubber sheet is always in a state of extrusion, resulting in faster aging, after a long time, the interface is prone to water seepage

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