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Geomembrane lining is applied to surface protection of hydraulic structures or impermeable seepage control hydraulic structures, with the advantages of good anti-seepage, light weight, thin, simple structure, low price, etc., widely used in hydraulic structures and other channels, dikes, earth dam seepage. If you choose improper construction methods, it will not only affect the quality and progress of the project, but it will also not be a safe project.
Preparation before geomembrane construction, first, select geomembrane materials, specifications and material selection according to design requirements to meet design and specification requirements. According to the construction organization design, determine the specific geomembrane construction steps. Pay attention to debris removal, prevent geomembrane from being pierced by various things. Before the manufacturer enters the site, require production product certificates and relevant performance and instructions. Under the supervision of relevant departments, the construction unit shall sample according to the required specifications, and then the designated testing unit shall conduct quality inspection. Test indicators meeting the specified requirements shall be put into use. When storing geomembranes, pay attention to moisture and waterproof, appropriate storage sunlight and shadow covering material warehouse.
The quality inspection connection of geomembrane in geomembrane construction, including geomembrane laying geomembrane and connection type hot melt connection geomembrane material is plastic material, can use hot melt connection, can also use pulse jump welding device, it uses low voltage pulse current with hot melt material. Welding along the seam, welding of plastic film, requires welding voltage, pulse current delay. Welding can obtain good results.
Solvent bonding, chemically dissolving the surfaces of two layers of material, can form a physical bond. Thermal connection is only to melt the surface layer of the material to achieve the purpose of bonding. Therefore, during construction, the connection method should be reasonably selected according to the actual situation of engineering construction. Adhesives with bonding contact are commonly used for magnetized lining membrane materials, such as ethylene, propylene series unit membrane materials. When bonding these materials, the surface must be coated with petroleum and distilled oil, then apply contact adhesive on the overlapping part of the seam membrane material and press. Some can also paste seals at the joints to enhance bonding performance. ("") When laying geomembrane by solvent method connection, the specified overlap amount must be retained along the edges and corners.
Wiping the joint surface with different solvents (such as ethylene, methyl oxide) or other materials can remove dust and debris on the joint surface. If the joint width is different, construction personnel can also wipe the dust and debris on the joint surface with cloth or water. After removing the surface oxide layer, apply any amount of solvent on it, apply the seam membrane material at the lap, then press with a roller. Before crimping, place a hard board under the bottom membrane material to ensure the roller has a solid contact surface.
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