When choosing the thickness of geomembrane, the following several factors can be taken into consideration

(1) Water pressure and the particle size distribution of the butt material of geomembrane;

(2) Interface treatment method;

(3) The expected effect of the waterproof layer;

(4) Performance indicators of geomembrane;

(5) Investment projects and economic benefits;

(6) The scale of the enterprise and the importance of the building, etc.

Considering the aspect of water pressure, a general thickness of 0.2mm for the geotextile membrane in the waterproof layer is sufficient. However, considering the significance of the water extraction construction project in the Awei Irrigation District, the performance indicators of the geomembrane, the quality of welding, etc., in the majority of the investigation and research reports, experience summaries, and specific guidance from professional technicians, combined with the actual situation of the construction project, taking into account factors such as hydrological climate, working environment, construction standards, service life, construction budget, and production and processing model specifications, The thickness of the high-density polyethylene geomembrane is determined to be 0.6mm for the comprehensive type. This type of film thickness has been applied in a total basin of 64.69 kilometers. The expected effect of the waterproof layer is very good, the construction loss rate is relatively low, and the water utilization rate of the method can exceed about 97%.

The tight connection welding of geomembrane is an important link to prevent water leakage: there are two methods, namely hot-melt welding with a double-gauge welding machine and adhesive bonding.

Geomembrane is commonly welded by hot wedge welding machines.

The following membranes are generally common small equipment

2. Weld the left and right ones with large equipment. The welding process flow is divided into: adjusting the working pressure, setting the temperature, setting the speed, welding lap, inspection, loading the film into the machine, starting the machine, pressurizing and welding. There should be no oil stains or dust at the interface. The lap joint surface of the hdpe geomembrane should not be sewn with fine sand or other dirt. When there is dirt, it must be cleaned up thoroughly before welding.

Detailed Explanation:

1. Total width of weld lap: 80 to 100mm; The natural folds of the planar plane and the vertical plane are respectively: 5% to 8%. Embedded telescopic capacity: 3% - 5% The remaining amount of leftover materials: 2% to 5%. 2. The operating temperature for hot-melt welding is 280 to 300℃. The driving speed is 2 to 3 meters per minute. The welding method is double weld seam. 3. Repair method for damaged areas: Cut raw materials of the same specification and model, and use the leister manual extrusion welding machine for welding repair.

Types of geomembrane welding machines:

leister double welding machine, leister single welding machine, leister hot wedge welding machine.

Welding

1. Put the solid KS glue into a wok, set up the wok, and melt the KS glue over heat.

2. Melt the KS glue and set it aside. Clean the parts of the geomembrane that must be bonded thoroughly to ensure there is no soil or oil stains.

3. The total width of the geomembrane lap is 10 to 12cm. Use a soft brush to apply KS glue to the bonding area of the geomembrane, and press the lap area tightly and firmly to proceed.

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