Bimetal spiral steel pipe and manufacturing method thereof

Abstract

The invention discloses a bimetal spiral steel pipe and a manufacturing method thereof. The steel pipe comprises a pipe body, wherein the pipe body surface extends outwards to form a convex rib which is spirally arranged around the outer wall of the pipe body; the convex rib forms a groove with the pipe body surface and is provided with an auxiliary inner steel band capable of covering the groove notch; and a hollow cavity is formed between the groove and auxiliary inner steel band, and is filled with concrete. The convex rib on the outer wall of the pipe body and the pipe body are integrally formed without any welding seam, and thus, can resist the dynamic load fatigue when bearing the dynamic load. The pipe body inner wall is provided with the auxiliary inner steel band made of a specific metal material, thereby enhancing the corrosion resistance and wear resistance of the steel pipe, avoiding the fluid pollution, reducing the thickness of the steel pipe main body and lowering the material cost. The pipe can be used in the occasions for delivering water or other special media, such as supply or discharge of water, high-corrosivity media, media with higher requirements for purity, high-temperature media and the like, and greatly lowers the manufacturing cost.

Description

technical field [0001] The invention discloses a steel pipe and a manufacturing method thereof, in particular to a bimetal spiral steel pipe and a manufacturing method thereof. Background technique [0002] At present, in the transportation, storage and transportation of fluids, pipelines are generally used for transportation. Commonly used pipelines include cement pipes, plastic pipes, ordinary carbon steel pipes, stainless steel pipes, and galvanized steel pipes. Among them, the cement pipe is a prefabricated pipe made of cement and steel bars and using the principle of centrifugal force, but it is easy to leak and has poor internal pressure resistance; and the caliber is not large, generally 3 meters or less; each section of pipe The length is not long, there are many joints, the joints are easy to leak, and the construction is difficult; the foundation must be made first during construction, and the construction cost is relatively high. Plastic pipe is made of plastic r...

AI Technical Summary

Problems solved by technology

There are the following defects: ①. The pipe body and the reinforcement ring are two separate parts, which are connected as a whole by the weld. When the reinforcement ring is stressed, the weld seam is a stress concentration area and there is a hidden danger of cracking; ②. In the process of rolling and bending Among them, because the weld seam is outside the processing deformation zone, the weld seam is stretched, deformed greatly, and is easy to crack; ③, if the pipe body is subjected to dynamic load for a long time, such as subways, vehicles, etc., the weld seam is very easy to crack due to dynamic load fatigue. Cracking; ④. In view of the semi-flexible structure of this type of pipe body, especially when the pipe body with large diameter relies heavily on the joint force effect of pipe and soil (that is, the joint deformation of the pipe body and the surrounding backfill soil), it should be increased The rigidity of the pipe body itself to avoid large deformation

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