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      When the damaged part of the outer wall of the PE pipe shows a broken pipe wall or a hole within 0.1m in length, use a scraper to completely remove the broken pipe wall or hole. Clean the area within 0.05m around the removed part with cyclohexanone and brush it with plastic adhesive with good water resistance; Then, remove a curved plate from the corresponding part of the same pipe that is twice the damaged area, apply adhesive to the inner wall and attach it to the damaged area, and fix it with lead wire wrapping. If there are ribs on the outer wall of the pipe, remove the ribs within 0.05m around the damaged area and scrape them flat without rib marks.

      When there are local or small cracks or holes within 0.02m on the outer wall of the PE pipe, the water inside the pipe can be drained first, and the damaged area can be cleaned with cotton yarn. Then, after brushing the base surface with cyclohexanone, a plastic adhesive with good water resistance can be applied; Similar shaped and sized boards were taken from the corresponding parts of unused pipelines and bonded, wrapped and fixed with geotextile. After curing for 24 hours, the soil can be restored.