HDPE double wall corrugated pipe repair points

2015-5-8 19:04:01

1, HDPE double-wall corrugated pipe laying, due to accidental factors caused local damage to the pipe wall, when the area of the damaged part or the length and width of the crack do not exceed the provisions, paste repair measures can be taken.

2. When the hole diameter or side length of the local damage of the HDPE double-wall corrugated pipe wall is not greater than 20mm, the PVC plastic bonding solvent can be used to paste a circular plate with a diameter of not less than l00mm and the same material as the pipe on the outside.

3, when the local damage hole of the pipe wall is 20 ~ 100mm, the PVC plastic bonding solvent can be used to paste the circular plate of not less than the hole size plus l00mm and the same material as the pipe on the outside.

4, local cracks appear in the pipe wall, when the length of the crack is not greater than 1/12 of the circumference of the pipe, the length of the crack can be pasted at the crack is greater than the length of the crack plus 100mm, the width is not less than 60mm and the same material as the pipe board, the two ends of the board should be cut into a circular arc.

5. The water in the pipe should be removed before repair, and the damaged part of the pipe wall should be trimmed with a scraper and cleaned with water. For the special-shaped wall pipe, remove the ribs within the patching range, and then smooth with sandpaper or file.

6. Before bonding, brush the base surface of the bonding part with cyclohexanone, and brush the bonding solvent as soon as possible after drying. The plate for external paste should be curved plate cut from the corresponding part of the pipe of the same diameter. The inside of the outer plate is also cleaned first, and the base surface is coated with cyclohexanone and then the adhesive solvent is applied.

7. For holes not larger than 20mm, after pasting, geotextiles can be wrapped and fixed, and the soil can be returned after 24 hours of curing; Holes and cracks larger than 20mm can be wrapped with lead wire after pasting.

8, after the completion of pipeline repair, the hollowed part of the bottom of the pipe is backfilled with coarse sand according to the requirements of the supporting Angle.

9. To take repair measures for damaged pipelines, the construction unit shall obtain the consent of the management unit and the on-site supervisor in advance; For the damage at the bottom of the pipe, the consent of the design unit should also be obtained before implementation.

10, such as the use of welding rod welding or chemical sealing agent and other leakage repair measures, the management unit can be approved before implementation.

11. When the size of the damaged part of the pipeline exceeds the provisions of the above provisions, the damaged pipe section shall be replaced. When there is no special connection between the replaced PE double-wall corrugated pipe and the laid pipe, the inspection well or connecting well connection can be constructed.