An Improved Pipeline Stainless Steel Lining Repair Method

Abstract

The invention relates to an improved repair method for a stainless steel lining of a pipeline. The design of a stainless steel coupling and a process for anchoring the coupling and an old pipeline are added on the basis of a conventional stainless steel lining repair method, and the overall capability of the lined pipeline in resisting negative pressure and external water pressure is improved by virtue of the stainless steel coupling; by the coupling, a function of limiting the deformation of the lined pipeline is realized, and a part of load on the lined pipeline can be transmitted to an old pipeline through a coupling anchorage bolt to utilize the strength of the old pipeline, so that the overall stiffness of the pipeline is improved. Compared with a conventional method, the method has the advantages that the lined pipeline with the same wall thickness is higher in ring stiffness, negative pressure resistance and external water pressure resistance, so that the repaired pipeline can run more safely, the service life of the repaired pipeline is also guaranteed, and the cost performance of a repaired large-diameter pipeline is higher.

Description

technical field [0001] The invention relates to an improved method for repairing the stainless steel inner lining of pipelines. Specifically, a non-excavation repairing technique is adopted, by pre-anchoring the couplings in the old pipelines, and using connectors to anchor the couplings to the inner wall of the old pipelines. Together, the lined pipe blanks are transported into the old pipeline, and the pipe blanks are welded to the adjacent two couplings one by one, and then the axial joints of the tube blanks are welded to form a complete lined pipe, and the whole pipe is completed. Repair of old pipes. The invention belongs to the field of municipal engineering. Background technique [0002] At present, the stainless steel lining pipe technology is used to repair old and broken water supply pipes, which has a certain application in China. Stainless steel lining is a non-excavation repair technology invented for water supply pipes. The stainless steel plate is made into...

AI Technical Summary

Problems solved by technology

However, there are some deficiencies in practical application. The biggest disadvantage is that due to the small wall thickness of the stainless steel lining pipe, the ring stiffness of the lining pipe is small, and there is no stable anchorage between the lining pipe and the old pipeline. Due to local large negative pressure and external water pressure, the lining pipe is prone to failure, which will lead to partial or overall inward collapse of the lining pipe, and the function of the pipeline will be seriously affected.

A preferred method to prevent the stainless steel lined pipe from sinking under negative pressure is to increase the wall thickness of the stainless steel lined pipe, but this method will greatly increase the entire repair cost and lose the technical and economic value of using this method

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