Repairing method for adding liner on underground pipe

Abstract

The invention discloses a repairing method for adding a liner on an underground pipe. The repairing method comprises the following steps: (1) operation pits are dig at two ends of a pipe required to be repaired; (2) the old pipe is cut off in the positions of the operation pits; (3) a new pipe with a proper outer diameter is selected; and adhesive is coated on the outer wall of the new pipe; (4) the new pipe serves as the liner to penetrate in the old pipe; and (5) the adhesive is cured to bond the outer wall of the new pipe with the inner wall of the old pipe. The method has the advantages of no influence on road traffic and river navigation in operation, no environmental damage, short construction period and effective saving of engineering investment; in addition, the adhesive is coated on the outer wall of the new pipe before the new pipe penetrates into the old pipe, and the adhesive is cured after the new pipe penetrates into the old pipe, so that the outer wall of the new pipe and the inner wall of the old pipe are tightly bonded to enable the new pipe and the old pipe to be connected as a whole; the whole new pipe realizes uniform pressure bearing; and the pressure bearing capacity of the new pipe is effectively improved when the pipe repairing is finished.

Description

technical field [0001] The invention relates to the field of post-management of underground pipelines, in particular to a method for repairing underground pipelines with inner lining. Background technique [0002] At present, most of the fluids and gases are transported by buried pipelines for long distances. The underground gathering and transportation pipeline network is facing the problem of late corrosion. Clean, repair or even replace. [0003] At present, the common way to repair the pipeline is to excavate the whole line and completely replace the damaged pipeline. This method is not only costly and time-consuming, but also affects traffic, and is easy to cause damage to adjacent pipelines and optical fibers. Buildings and pipelines under important traffic arteries often cannot be replaced. [0004] Therefore, the HDPE (High Density Polyethylene) pipe insertion method for repairing old pipelines has emerged. The feature of this technology is that it does not need to...

AI Technical Summary

Problems solved by technology

[0005] Although this method effectively reduces the cost of pipeline repair and effectively avoids the impact and pressure on traffic during the pipeline repair process, the outer wall of the new pipeline cannot closely fit the inner wall of the original pipeline. During the process of conveying the medium, the pressure of the new pipeline is uneven, and even the outer wall of the new pipeline is broken

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