Technology for repairing big-caliber concrete pipeline lining by utilizing thin wall stainless steel

Abstract

The invention relates to a technology for repairing a big-caliber concrete pipeline lining by utilizing thin wall stainless steel. The repair technology comprises the following steps: (1) pretreating in the earlier stage; (2) rolling and transporting the thin wall stainless steel; (3) positioning, internally supporting and spot-welding the stainless steel lining; (4) welding a stainless steel lining pipe; (5) conducting liquid penetration testing on the weld joint of the stainless steel lining pipe; (6) pickling and inactivating the weld joint; (7) rounding off in the later period. The technology for repairing the big-caliber concrete pipeline lining by utilizing thin wall stainless steel provided by the invention adopts the thin wall stainless steel to repair the big-caliber concrete pipeline (the diameter of the pipeline is larger than DN2000); compared with the other pipeline repair schemes, the anticorrosion property of the repaired pipeline is greatly increased, the service life of the pipeline can be prolonged by more than 30 years; for repair of the water supply pipeline, the technology can achieve higher water quality and weight of water supply than other schemes; compared with the pipeline laying again, the cost is greatly lowered, and the construction cycle is shortened.

Description

technical field [0001] The invention relates to the technical field of pipeline inner wall treatment, in particular to a repair process applied to lining thin-walled stainless steel in large-diameter concrete pipelines (diameter greater than DN2200). Background technique [0002] Water security affects social stability. During the operation of urban water supply pipelines, due to various reasons such as corrosion and damage, water leakage will occur after a period of operation, especially for source water pipelines. Generally, the diameter of the pipeline is large, and serious water leakage is likely to cause social problems, and re-laying of source water pipelines The amount of work is large and the cycle is long. Therefore, repairing the pipeline is the most appropriate technique. [0003] At present, there are usually composite material lining methods, coating lining methods, and stainless steel lining methods for repairing water leakage in large-diameter concrete pipel...

AI Technical Summary

Problems solved by technology

This method has the following defects: strict requirements on the treatment of the concrete pipe wall to be repaired, extremely high requirements on environmental conditions, occupying a certain flow section, high construction technology requirements, uncontrollable cost, and uncertain construction period

[0006] ⑶. Lining stainless steel method: the stainless steel pipe is welded on the inner wall of the pipe by butt welding. The existing lining method is limited by the process, and is only suitable for repairing concrete pipes with a diameter of less than 1.2m. If it is applied to large Concrete pipes with pipe diameters greater than DN2200 have technical problems in the processing, transportation, and welding of lined pipes. Production of negative pressure may cause pipeline deformation and affect water supply safety

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