The composite geomembrane extends from the bottom to the top. Do not tighten it too much. The space of 1.50% is used for local sag stretching and stretching. It is closely combined with the specific conditions of the project and the slope is paved from top to bottom. The two adjacent longitudinal seams should not be on one horizontal line, and should be away from the other side by 1 meter or more.
Composite geomembrane is a kind of waterproof raw material based on polymer. Firstly, it can be divided into: low density polyethylene based film, high density polyethylene based film and EVA based film.
Features: 1. The specifications for width and thickness are complete and detailed. 2. Resistant to environmental stress cracking and chemical resistance. 3. Chemical corrosion resistance. 4. The actual operating temperature scale is large, and the use period is long. 5. Mainly used in landfills, tailings ponds, road waterproofing, river embankment waterproofing, subway station engineering projects, etc.
The longitudinal joint of the composite geomembrane should be 1.5m and above from the dam foot and bent foot, and should be located on the plan. First, the bottom of the field after the slope; when laying the slope, the film direction should be substantially parallel to the larger slope line. Geomembrane uses plastic film as the waterproof base material, and the composite material of geomembrane and non-woven fabric becomes geomembrane impermeable raw material. The basic function of geomembrane waterproofing mainly depends on the basic function of plastic film waterproofing.
Nowadays, the plastic films for waterproofing at home and abroad, the key is polyvinyl chloride (PVC) and polyethylene, ethylene/vinyl acetate copolymer), has been planned to be used in tunnels (ethylene vinyl acetate modified asphalt mixed geomembrane) , They are a kind of flexible polymer chemical raw materials, the ratio is small, expansibility, can be used for high deformation, corrosion resistance, low temperature resistance, freeze resistance function is good.