Before splicing geomembrane, the bonding surface must be cleaned, and there must be no oil and dust on the bonding surface. In rainy and cloudy days, work under the canopy and keep the bonding surface dry. Geomembranes should be cut neatly to ensure adequate bonding width.
When void, shrinkage, wrinkle and twist bulging occur in the construction process, it should be removed and re-bonded to ensure the bonding quality. In this way, the good effect of geomembrane products can be achieved.
How to ensure that geomembrane plays a better role. Before welding, the sand, soil and other dirt on the film surface are blown by hairdryer to ensure that the film surface is clean. A long wooden board is laid under the welding part so that the welder can walk on the flat base surface and ensure the welding quality. Before formal welding, the walking speed and welding temperature are determined according to the construction temperature. Generally, the walking speed is 1.5-2.5m/s and the welding temperature is 220-3000c.
There are two spliced welds, each of which is 10 mm wide. There is a 10 mm cavity between the two welds. The quality of the weld is checked by this cavity. 10 cm sand cushion is evenly spread on the top of geomembrane, and 10 cm concrete is spread after leveling and compacting. When the composite geomembrane on the slope is qualified, the cushion cover should be spread in time to prevent the wind blowing and the aging of the composite geomembrane in the sun. At the same time, concrete lining should be done to strengthen the protection of the geomembrane.
Geomembranes should be tested strictly in all aspects.
Early geomembrane is a single film, which can be divided into single film and multi-layer composite film of different resins. Although the geomembrane has high elongation and is beneficial to waterproofing, its tensile strength is low, and it is easy to be broken and punctured in contact with gravel. Single geomembrane requires high support and protective layer. Composite geomembrane is a combination of geomembrane and geotextile made according to certain requirements.
The application characteristics of geomembrane determine that the material of geomembrane should not only have the properties of acid resistance, aging resistance and corrosion resistance, but also have good low temperature flexibility. Wide geomembrane should be selected as far as possible. If the selected width is narrow, it should be spliced into a wide width in the factory or in the field shed, and rolled up coils should be transported to the paving surface to reduce the workload of joint and sticking (lapping) on site. All roots, weeds, pointed grass and spikes should be removed from the paving surface to ensure that the surface of the gravel mattress is smooth, no protruding and depressing parts should be allowed, and compaction should be carried out. Remove all accumulated water within the scope of paving work.