Precautions for geomembrane

1 Base surface requirements for geomembrane construction

The surface of the installation base should be compacted and leveled, and sharp objects such as tree roots, stones, glass and iron nails should be removed; the yin and yang corners of the base should be trimmed and smooth, and the radius of the fillet should be ≥50cm, and the surface of the welding seam must be cleaned; After the construction party has signed and approved the construction, the construction of geomembrane can be carried out.

2 Climate requirements for geomembrane construction

The temperature should generally be above 5 ℃, the geomembrane should be tighter at low temperature, and the geomembrane should be relaxed at high temperature. Geomembrane installation and construction should be appropriately pre-loaded with 2% to 5% of the extension amount according to the specific site conditions and the prevailing climatic conditions; the wind force is below level 4; when the temperature is too low, construction should not be carried out in strong winds above level 4 and in rainy and snowy weather; When the weather and wind affect the construction of the geomembrane, the geomembrane to be welded should be firmly pressed with large stones or sand bags.

3 Laying of geomembrane

When laying geomembrane, the direction of the seams in the entire anti-seepage system is parallel to the maximum toe line, that is, along the slope direction. When laying geomembrane, the minimum number of welds should be sought, and the raw materials should be saved as much as possible on the premise of ensuring the quality, and it is also easy to ensure the quality. Usually in corners and deformed areas, the length of the seam should be minimized. Except for special requirements, on slopes with a slope greater than 1:6, within 1.5m from the top slope or the stress concentration area, try not to set up welding seams. During the laying of the geomembrane, artificial folds should be avoided. When the temperature is low, it should be tightened as much as possible and flattened. After the geomembrane is installed, walking on the membrane surface, moving tools, etc. should be minimized. Any objects that can cause harm to the geomembrane should not be placed on the membrane or carried on the membrane to avoid accidents to the geomembrane. damage. The more critical process is to unpack and inspect the appearance quality of the geomembrane before laying the film, and record and repair the found mechanical damage and production wounds, holes, breakages and other defects. Before the geomembrane is cut, its relevant dimensions are measured, and then cut according to the actual situation. During the laying of the membrane, the lap width of the seam between the membrane and the membrane is 10cm to 15cm, so that the direction of the seam arrangement is parallel to the maximum toe line, that is Arrange along the slope direction

4 Welding of geomembrane

The geomembrane is welded using a double-drive self-propelled geomembrane welding machine, which adopts double-track hot-melt welding. For the parts that cannot be welded by the welding machine, an extrusion type hot-melt welding machine should be used, and the welding rod of the same quality as the raw material should be used to form a single welding seam for surfacing welding; the welding process of the welding machine is divided into: adjusting pressure, setting temperature, setting Speed, welding seam lap inspection, loading film into the machine, starting the motor; there should be no oil stains and dust at the joints, and there should be no sediment, condensation, moisture and other debris on the overlapping surface of the geomembrane. It must be cleaned up before welding; at the beginning of welding every day, usually a 0.9mm X 0.3mm sample should be welded on site first, and the lap width should not be less than 10cm. After passing the qualification, the welding can be performed with the speed, pressure and temperature adjusted at that time. In the process of welding geomembrane, the welding machine needs to pay attention to the operation of the welding machine at any time, and fine-tune the speed and temperature according to the actual situation on the site; When the length of the geomembrane is not enough, it needs to be spliced in the long direction. The transverse weld should be welded first, and then the longitudinal seam should be welded. The distance between the transverse welds is greater than 50cm.

It should be T-shaped and not criss-cross; no dead folds are allowed when welding the geomembrane. When laying the geomembrane, the amount of expansion and contraction caused by the temperature change should be reserved according to the local temperature change and the performance requirements of the geomembrane; during the rainy period Or welding can not be carried out when there is moisture, dew, or large sand in the joint, except for taking protective measures; when the temperature is lower than 5 °C, construction should not be carried out according to the requirements of the specification. If construction is necessary, the welding machine should be carried out before welding. Preheating treatment: The geomembrane should be powered by a generator with good voltage stabilization performance during welding, and a voltage stabilizer must be used when using local electricity under special circumstances.

If you have any questions, please contact us and we will get back to you as soon as possible.(www.zlgeo.com).

Summer Meng

Anhui Zhonglu Engineering Materials Co., Ltd.

Address: 2-3C, Innovation And Entrepreneurship Park, Hefei City, Anhui Province,China

Tel./Wechat/Whatsapp: +86 18056028960

Email: summer@zhongloo.com