Prestressing large-scale spiral fin steel tube

Abstract

The invention relates to a prestressing large-scale spiral fin steel tube, which consists of a steel tube body, protective layers and prestressing steel wires; the inner wall and the outer wall of the steel tube body are respectively and fixedly provided with the protective layer; the prestressing steel wires are twisted on the outer wall of the steel tube body in the protective layer; wherein the inner wall of the steel tube body is fixedly provided with a continuous spiral steel fin; and the steel fin is buried in the protective layer of the inner wall of the steel tube body. The steel tube is a prestressing large-scale spiral fin steel tube meeting the national policies of energy saving and emission reducing, which has the advantages of thin tube wall, light weight, good antiseptic property, longer service life, effective reduced integral cost of the tube, more interface types and convenient construction.

Description

technical field [0001] The invention relates to a steel pipe, in particular to a prestressed large-scale spiral-ribbed steel pipe. Background technique [0002] Steel pipes are mainly used to transport liquids and gases. Its main advantages are: high strength, good toughness, large bearing stress, good impact resistance and tightness, good plasticity, and easy welding and thermal processing. However, its corrosion resistance is poor, and proper anti-corrosion measures are required. Steel pipes are generally made of high-quality low carbon steel (Q235) or low alloy steel (16Mn). At present, most of the steel pipes sold in the market are non-prestressed steel pipes, especially large-scale pipelines for oil, gas and water transportation. Today, the rise of its raw material iron ore is particularly obvious. Taking the DN3600 pipeline as an example, the working conditions are: working pressure 0.6MPa, covering soil depth 2m, the thickness of the steel plate required for ordina...

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Problems solved by technology

At present, most of the steel pipes sold in the market are non-prestressed steel pipes, especially large-scale pipelines for oil, gas and water transportation. Today, the rise of its raw material iron ore is particularly obvious. Taking the DN3600 pipeline as an example, the working conditions are: working pressure 0.6MPa, covering soil depth 2m, the thickness of the steel plate required for ordinary steel pipes is at least 32mm, and the pipeline steel per linear meter The dosage is 2898Kg. Although the increase of steel pipe wall thickness can meet the purpose of conveying pressure fluid, there are the following problems: 1. At present, the steel pipe wall is thicker, which leads to an increase in the amount of steel used to produce each steel pipe, and the cost of raw materials is higher; 2. .The increase in the amount of steel used for pipes will increase the difficulty of transportation and construction; 3. The extensive use of steel will lead to higher and higher energy consumption, especially the consumption of some non-renewable resources, which is not in line with the environmental protection of energy conservation and emission reduction advocated by the state Policy; 4. At present, the protective layer of steel pipes is generally epoxy coal tar pitch or cement mortar, which has poor anti-corrosion performance, which directly leads to short service life of steel pipes and increases the cost of replacement

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