Geomembrane

What should be paid attention to in the overlapping construction of adjacent composite geomembrane?

2020-12-18
When overlapping with the adjacent composite geomembrane, first expose the geotextile at the joints, sew the adjacent geotextile of the lower layer, adjust the welding edge of the two membrane layers, and weld the middle of the composite geomembrane with an overlap width of 150mm body. Then, check the quality of the welded structure, and after passing the inspection, the upper geomembrane can be sewn.






In the construction of composite geomembrane welding, there are two commonly used welding equipment, namely hot wedge welding machine and extrusion welding electrode welding machine. In the composite geomembrane welding construction of this project, an extrusion welding machine was used. Before welding, clean up debris. After the welding is completed, clean the dust on the joint to ensure the quality of the welding structure. In addition, before welding the building, test welding should be carried out according to the ambient temperature of the construction site, and the walking speed and the temperature of the welding equipment should be adjusted.

The operating speed of the welding machine should be controlled between 1.50-2.50 m/s, and the welding temperature should be controlled between 210-300. In the two types of weld structures, long wooden blocks must be placed in the weld as a splicing platform for the composite geomembrane. Thorough inspection of the wood board to ensure that the surface of the wood board is smooth and avoid piercing the composite geomembrane, thus laying the foundation for the quality control of the welded structure. If there is dust, water stains or other debris on the welding surface of the composite geomembrane, a small motor should be used to clean the air to ensure that the surface of the composite geomembrane is clean and flat.

In the composite geomembrane welding construction, the professional skills of the welding construction personnel are required, and the welding construction personnel must have a welding operation certificate. During the welding construction process, the operating status of the welding machine is monitored and analyzed, and the welding speed and temperature are optimized and adjusted according to the actual conditions of the construction site. For the welding position, care must be taken to avoid moisture, precipitation, etc. If there is residue, please clean it before soldering. In the construction of geomembrane laying, if splicing and extension are required, transverse seam welding should be carried out first, and then longitudinal seam welding should be carried out. The two adjacent layers of the composite geomembrane require staggered jointed folded plate structures. In terms of weld seam control, the appearance should be clean to avoid problems such as staggered weld seams, overlap and jump. If there is welding slag in the weld, it should be polished to ensure the quality of the weld structure.
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