Liner tube type electromagnetic repairing method for old pipe

Abstract

The invention discloses a liner tube type electromagnetic restoration method used for old pipelines and is characterized in that: an inner liner tube arranged in an original pipeline or an outer liner tube is arranged outside the original pipeline according to the damaged condition of inner and outer walls of the pipe, the outer diameter of the inner liner tube is slightly smaller than the inner diameter of the original pipeline, the inner diameter of the outer liner tube is slightly bigger than the outer diameter of the original pipeline; an electromagnetic coil is arranged inside the inner liner tube or outside the outer liner tube to impose a pulse current to the electromagnetic coil to ensure that the coil space produces a pulse magnetic field, the inner surface of the inner liner tube or the outer surface of the outer liner tube can produce pulse induction currents i' with different directions, thereby producing a pulse induction magnetic field in the space of the liner tube; the pulse magnetic field and the pulse induction magnetic field are interacted between the liner tube and the electromagnetic coil to ensure that the inner surface of the inner liner tube or the outer surface of the outer liner tube has a diameter expanding deformation or diameter shrinking deformation due to the magnetic pressure, and the deformed liner tube is closely combined with the original pipeline.

Description

technical field

[0001] The invention relates to a liner type electromagnetic repair method for old pipelines. Background technique

[0002] Various pipelines are buried underground in modern cities to provide transportation channels for electricity, natural gas, tap water, sewage, etc. The materials of the pipelines include cement, steel, cast iron and so on. After long-term use, damage such as perforation and rupture will inevitably occur in these pipelines, which will affect normal use, so it needs to be repaired.

[0003] The existing repair methods for damaged pipelines are to use cement, resin, plastic, rubber and other materials to coat the inner or outer walls of damaged pipelines, and form a lining after curing, so as to achieve the purpose of repair, but the lining formed by these materials The layer generally has the disadvantages of low strength and easy peeling. At the same time, if it is used for the transportation of liquid media such as water, it will also ca...

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