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Matters needing attention in the construction of composite geomembrane

Release time:

2021-02-22 17:15

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The composite geomembrane is pasted on one or both sides of the film to form a composite geomembrane. Its form has a cloth a film, two cloth a film, two film a cloth and so on. Geotextile as a protective layer of geomembrane, so that the protection of impermeable layer is not damaged. In order to reduce ultraviolet radiation and increase anti-aging performance, it is best to use the embedding method.

 

In the construction, first of all, the sand or clay with small material diameter should be used to level the base surface, and then the geomembrane should be laid. Geomembrane should not be stretched too tightly, and the buried soil part at both ends is corrugated. Finally, a layer of 10cm over-layer is paved with fine sand or clay on the geomembrane. 20-30cm stone blocks (or precast concrete blocks) shall be laid on the masonry as anti-scour protective layer. During the construction, we should try our best to avoid the stone directly hit on the geomembrane, it is best to lay the film side of the construction of the protective layer. The composite geomembrane shall be connected to the surrounding structures by expansion bolts and steel plate banding, and the connecting parts shall be coated with emulsified asphalt (2mm thick) for bonding to prevent leakage.


Precautions for construction of composite geomembrane:

1, the use of embedded type: the thickness of the cover should not be less than 30cm;

2. The renovation anti-seepage system shall be composed of cushion layer, anti-seepage layer, transition layer and protective layer;

3, the soil should be solid, avoid uneven subsidence, cracks, anti-seepage range of turf, roots to remove. Sand or clay with small particle size shall be laid on the contact surface with the membrane as a protective layer;

4, the laying of geomembrane do not pull too tight, both ends of the embedded soil part into a corrugated shape is better, especially with rigid material anchoring, should have a certain amount of expansion;

5. During construction, stones and heavy objects should be avoided directly on the geomembrane. It is best to lay the film while constructing and cover the protective layer.

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