Construction Method of Geotextile
1. Filament or short-filament geotextile is usually installed by several methods such as lap joint, stitching and welding. The width of stitching and welding is generally 0.1m or more, and the overlap width is generally 0.2M or more. Geotextiles that may be exposed for a long time should be welded or stitched.
2. Geotextile stitching: All stitching must be continuous (for example, point stitching is not allowed). Polyester nonwoven geotextile for sale must overlap at least 150mm before overlapping. The minimum stitch distance from the weaving edge (the exposed edge of the material) is at least 25mm. The most sewn geotextile seams include one line and chain lock chain seam. The thread used for stitching should be a resin material with a minimum tension of more than 60N and have chemical resistance and ultraviolet resistance comparable to or beyond that of geotextiles. Any “missing needle” on the sewn geotextile must be re-sewn where it is affected. Appropriate measures must be taken to prevent soil, particulate matter, or foreign matter from entering the geotextile layer after installation. Cloth overlap can be divided into natural overlap, seam or welding according to the terrain and use the function.
3. In the construction, the geotextile above the geomembrane is naturally overlapped, and the upper geotextile of the geomembrane is welded by steam or hot air. Hot air welding is the first method of connecting filament geotextiles. That is, the connection between two pieces of cloth is instantly heated at high temperature with a hot air gun so that some parts of the cloth are melted, and immediately using a certain external force to firmly bond them. In the case of hot (rainy or snowy) weather when hot-stick bonding cannot be performed, the geotextile should adopt another method-a suture connection method, that is, a double-thread suture connection with a special sewing machine, and a chemical UV-resistant suture line. The minimum width is 10cm when stitching, the minimum width is 20cm during natural overlap, and the minimum width is 20cm during hot air welding.
4. For seams, use sutures of the same quality as high quality polyester nonwoven geotextile, and use sutures that are more resistant to chemical damage and ultraviolet light.
5. The two layers of geotextile above and below the membrane shall be buried in the anchoring groove together with the geomembrane at the locations where there are anchoring grooves.