What is the laying and welding process of geomembrane?

The laying and welding process of geomembrane can be roughly divided into the following steps:

1. Preparation for construction
- ** Site cleaning ** : thoroughly clean the laying area to ensure that the ground is smooth and clean, without sharp objects and debris, so as not to damage the geomembrane.
- ** Base inspection ** : Cooperate with relevant departments to conduct a comprehensive inspection of the laying base to ensure that the laying conditions are met.
- ** Design planning ** : According to the engineering design drawings, determine the laying direction, sequence and cutting size of the geomembrane.

2. Lay
- ** Laying geomembrane ** : According to the site measurement size, the cut geomembrane is rolled out in the numbering sequence, and enough edges should be left for subsequent bonding and welding when laying.
- ** Lap treatment ** : The edges of the two geomemes need to overlap, and the lap width is usually not less than 200mm to ensure that there are no bubbles and wrinkles at the joints, and the surface is flat.

3. Preparation for welding
- ** Clean joints ** : Clean joints with clean rags to ensure that there is no oil, water, dust and other impurities.
- ** Preheat welding machine ** : Preheat the geomembrane welding machine to the appropriate temperature, generally between 260-275 ° C.

4. Weld
- ** Hot melt welding ** : Use the preheated welding machine, place the hot knife at the joint of the two geomembrane, apply appropriate pressure, keep for about 12 seconds, and then move the welding machine at a constant speed, so that the edge of the geomembrane is melted and tightly bonded. During the welding process, ensure that the weld is uniform, continuous, and without cracks.
- ** Multi-layer welding ** : For thicker geomembranes or special requirements, multiple welding may be required to ensure tightness.

5. Joint inspection and treatment
- ** Weld inspection ** : Immediately after the completion of welding, visual inspection of the weld, and air pressure test or vacuum test to ensure that there is no leakage.
- ** Repair ** : Defects or unqualified welds are found, marked and repaired or re-welded immediately.

6. Anchoring and protection
- ** Edge fixing ** : Use anchorage belts, jigs or other fixed devices to fix the edge of the geomembrane to prevent displacement and wind displacement.
- ** Cover protection ** : The welding area can be temporarily pressed with sand bags or other heavy objects to prevent strong winds or water flow from affecting the welding effect until the geomembrane is completely fixed.

7. Final inspection and acceptance
- Conduct a thorough inspection of the entire laying and welding area to ensure that all welds meet quality standards and are free of omissions and defects.
- After completing the above steps, the project can carry out the final acceptance to confirm that the geomembrane laying and welding work meets the design requirements and relevant standards.