Waterproof board is a kind of anti-seepage material made of macromolecule polymer. Waterproofing board is also called geomembrane, which is customarily called waterproofing board with a thickness of >= 0.8mm and geomembrane with a thickness of < 0.8mm. It is a kind of impervious material made of macromolecule polymer, which is divided into homogeneous waterproofing board and composite waterproofing board.
Its main function is to prevent liquid leakage and gas volatilization.
Raw materials are generally: low density polyethylene (LDPE), polyethylene (PE), high density polyethylene (HDPE), ethylene/vinyl acid copolymer (EVA), etc.
Classification of waterproofing board: HDPE waterproofing board HDPE pillar waterproofing board LDPE waterproofing board EVA waterproofing board
Waterproof board plays an important role in rock engineering for seepage control and isolation, but it also plays a role of strengthening and protection. Mainly used in earth-rock dams, rockfill dams, masonry dams, concrete dams, tailings dams,
Seepage control of sewage dam, channel, reservoir and other projects; seepage control lining of subway, basement and tunnel; seepage control of highway and railway foundation; and geotechnical materials such as filament geotextiles and bentonite waterproof blankets are used in sanitary waste landfills. Wait.
Code for construction of waterproof board
1. Preparations before laying: 1.1 Foundation treatment: Cleaning the pavement surface requires a smooth base, solid soil, not uneven, cracks, no sharp objects, stones, wires, sticks, etc. Within the impervious range of turf, tree roots to be removed, weeds to be sprayed with herbicides.
1.2 The protective layer of sand or clay with small particle size should be laid on the interface with the film. The thickness of the protective layer should not be less than 30.
2. Laying method:
2.1 Paving along a certain direction, while not too tight, should leave a certain amount of expansion to adapt to the deformation of the matrix.
2.2 When laying waterproof board, the direction of each unit should be adjusted to facilitate the welding of the two units.
2.3 After the waterproof board is laid, it should be pressed with sand bags to prevent wind and sand from affecting the welding of the next edge.
3. Waterproof board welding. Joint treatment is the key procedure of construction. Generally, thermal welding is used. The surface of PE film is heated to melt, and then it is melted into one by pressure.
3.1 For the paved waterproof board, the edge joints should be free of oil, water, dust and so on.
