Cement mortar external lining prestress steel pipe

Abstract

The invention relates to an externally-lined cement mortar prestressed steel pipe including a pipe body and an internal lining of the internal wall of pipe body. A cement mortar protection layer is coaxially and fixedly arranged on the outer wall of the pipe body; and prestressed steel wires are wound outer wall of the pipe body in the protection layer. The invention has simple structure, scientific and reasonable design, thin pipe wall, little steel consumption, low cost and long service life, and is one cement mortar externally-lined prestressed steel pipe with high corrosion prevention performance.

Description

Technical field [0001] The invention relates to a steel pipe, in particular to a prestressed steel pipe with a cement mortar outer lining. Background technique [0002] Steel pipes are generally used when the geographical environment does not allow grooving operations, the construction environment requires low noise and does not affect traffic or the ground is easy to settle. At present, steel pipes used for conveying pressure fluids are mainly welded with L175-L555 steel plates (tensile strength of 175-555MPa). Because these ordinary steels have low yield strength, when manufacturing steel pipes with high compressive strength, The wall design of the steel pipe is very thick. Take the DN1800 pipeline as an example, the working conditions are: working pressure 0.6MPa, overburden depth 2m, ordinary steel pipe requires a steel plate thickness of at least 14mm, and the steel consumption per linear meter of pipe is 695Kg. The increase in the thickness of the steel pipe wall can meet t...

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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 protective layer of steel pipes is generally coated with corrosion-resistant and wear-resistant materials on the inner wall of steel pipes. The increase in the use of energy-consuming and high-emission products will lead to a large consumption of energy, especially the consumption of non-renewable resources, and does not comply with the environmental protection policy of energy conservation and emission reduction advocated by the state

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