Prestress steel pipe

Abstract

The invention relates to a pre-stressed steel tube, consisting of a tube body, a protective layer of the outer wall of the tube body and a lining layer of the inner wall of the tube body, wherein pre-stressed steel wires are winded on the outer wall of the tube body in the protective layer. The invention has the advantages of simple structure, scientific and reasonable design, thinner tube wall, less steel consumption and lower cost. The invention provides the pre-stressed steel tube with long service life and more excellent corrosion proof performance.

Description

technical field [0001] The invention relates to a steel pipe, in particular to a prestressed steel pipe. Background technique [0002] Steel pipes are generally used when the geographical environment does not allow slotting operations, the construction environment requires less noise and does not affect traffic, or the ground is prone to subsidence. At present, the steel pipes used to transport pressure fluids are mainly welded with L175-L555 steel plates (tensile strength 175-555MPa). Since the yield strength of these ordinary steel materials is low, when manufacturing steel pipes with high compressive strength, The wall design of the steel pipe is very thick. Taking the DN1800 pipeline as an example, the working conditions are: working pressure 0.6MPa, soil covering depth 2m, the steel plate thickness required for ordinary steel pipes is at least 14mm, and the steel consumption per linear meter of pipeline is 695Kg. The purpose of the pressure fluid, but there are the fo...

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Problems solved by technology

Taking the DN1800 pipeline as an example, the working conditions are: working pressure 0.6MPa, soil covering depth 2m, the steel plate thickness required for ordinary steel pipes is at least 14mm, and the steel consumption per linear meter of pipeline is 695Kg. The purpose of the pressure fluid, but there are the following problems: 1. The thickening of the steel pipe wall leads to an increase in the amount of steel used to produce each steel pipe, and the increase in raw material costs; 2. The thickening of the steel pipe wall leads to an increase in the weight of the steel pipe, and transportation And the difficulty of construction is increasing; 3. At present, the steel pipe protective layer is generally coated with corrosion-resistant and wear-resistant materials on the inner wall of the steel pipe, and its outer wall is provided with an insulation layer and a protective layer. The insulation layer is generally made of polyurethane foam or silicate and For other insulation materials, the protective layer is generally made of plastic pipe or glass fiber reinforced plastic, which has poor anti-corrosion performance, which directly leads to a short service life of the steel pipe and increases the cost of replacement; in addition, steel is a product with high energy consumption and high emission. Large, it will lead to a large consumption of energy, especially the consumption of non-renewable resources, and does not conform to the environmental protection policy of energy conservation and emission reduction advocated by the state

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