Pipeline protection technology used for non-excavation penetration and urban old pipe network reconstruction

Abstract

The invention provides a pipeline protection technology used for non-excavation penetration and urban old pipe network reconstruction. A polyethylene (PE) main pipe is sleeved with a protection pipe which is made of PE100(RC) or common PE100 or common PE80, so that the problems of external scratching and point load damage of the PE main pipe in the non-excavation penetration process and the urban old pipe network reconstruction process (a pipe explosion method is adopted or non-excavation penetration is directly carried out in an old pipe network) are avoided, the service life of the PE main pipe is prolonged, and the safety of the PE main pipe is improved. Currently, direct welding is carried out only after the PE main pipe penetrates into the PE protection pipe, and non-excavation penetration and urban old pipe network reconstruction (the pipe explosion method is adopted or non-excavation penetration is directly carried out in the old pipe network) are carried out after welding is completed; connection of PE flanges and steel flanges is reduced in urban old pipe network reconstruction, the air leakage phenomenon is avoided, and the domestic blank of connection of steel pipes and PE pipelines is filled up.

Description

technical field [0001] The invention relates to the construction field, in particular to a pipeline protection technology for non-excavation crossing and reconstruction of old urban pipeline networks. Background technique [0002] Polyethylene pipes have small friction coefficient, wear resistance, excellent corrosion resistance, and lower cost than steel pipes. For severely corroded or leaked steel pipes, polyethylene gas protection pipes constitute structural composite pipes, which can restore pipeline functions and prolong service life. purpose of life. The HDPE pipe with excellent performance can greatly improve the wear resistance and pressure bearing capacity of the online pipeline, improve the corrosion resistance of the steel pipe, and increase its conveying capacity. Its conveying capacity can reach 4 times that of the steel pipe without damage from human factors. [0003] The long-term strength of PE pipe is high, which can ensure that the polyethylene pipe can wi...

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Problems solved by technology

However, although PE100-RC has the above advantages, limited by its high cost, PE100-RC pipes are seldom used directly as gas pipes in practical applications, and research in this field

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