Quality detecting method for inner lining old pipe

Abstract

The invention provides a method for detecting the quality of a lining pipeline, which comprises the following steps: the hermetic pressure-bearing structure of the old lining pipeline is constructed,i.e. the two ends of the old lining pipeline are respectively hermetically connected with a seal joint, wherein a pressure meter is installed on the seal joint at one end of the old lining pipeline, awater inlet tube communicates with the seal joint at the other end thereof and with a hand-operating test pump; clean water is taken as a detection medium, and the hand-operating test pump is taken as a pressure lifting tool to conduct bearing strength detection for the hermetic pressure-bearing structure; the pressure is reduced to tightness detecting pressure of 18MPa after the bearing strengthdetection, and the tightness detecting pressure is kept for 24 hours, i.e. the tightness detection is conducted for the hermetic pressure-bearing structure; the pressure is immediately relieved afterthetightness detection; the pressure relieving speed is not more than 1.0MPa / min. The method can detect the repair quality of the old lining pipeline, and avoid secondary excavation. Furthermore, the me thod has the advantages of simple detection means, applicability and less auxiliary equipment, thereby being suitable for field operation.

Description

technical field [0001] The invention relates to a repair technology for old pipelines, in particular to a quality inspection method for lining old pipelines. Background technique [0002] The technology of repairing old pipelines with the lining insertion method not only has a wide range of applications, but with the continuous upgrading of technology, this repair technology is becoming more and more mature. The reason is: if the combination of the inner lining layer and the inner wall of the old pipeline is not tight enough, or the combination of the two becomes loose as the re-application time goes by, the transport medium in the pipeline, especially small particles of sand, will easily enter the inner lining layer and the inner wall of the old pipeline. In this way, it is very easy to damage the repaired pipeline, thereby affecting production; [0003] In order to solve this problem, people add flanges for sealing connection at both ends of the old pipeline, and turn the...

AI Technical Summary

Problems solved by technology

[0002] The technology of repairing old pipelines with the lining insertion method not only has a wide range of applications, but with the continuous upgrading of technology, this repair technology is becoming more and more mature. The reason is: if the combination of the inner lining layer and the inner wall of the old pipeline is not tight enough, or the combination of the two becomes loose as the re-application time goes by, the transport medium in the pipeline, especially small particles of sand, will easily enter the inner lining layer and the inner wall of the old pipeline. In this way, it is very easy to damage the repaired pipeline, thereby affecting production;

[0004] In order to test the repair quality, reduce the risk of repair failure, and avoid secondary excavation and unnecessary economic losses, it is necessary to carry out quality inspection on the repaired old pipeline. For this technology, the current difficulties How is the quality inspection carried out after the repair, before the front and rear sealing connections of the lined old pipes

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