Geomembrane

Butt joint of composite geomembrane and surrounding concrete impervious body

2020-05-07
According to the experience and lessons of the relevant engineering projects, in the real anti-seepage process, the peripheral access of the composite geomembrane usually becomes the most vulnerable or the weakest point where problems occur. Access of composite geomembrane and surrounding concrete impervious body.

According to the planning regulations and on-site experiment requirements, the anti-seepage characteristic experiment of the reasonable access scheme of composite geomembrane and concrete building was carried out on the refined concrete square table. The top surface of the concrete square table has permeable holes, and the permeable holes communicate with the steel pipes on the side wall of the square table. The composite geomembrane is stabilized on the top surface of the concrete square table according to different connection methods, and then the composite geomembrane is pressurized by adding water under positive pressure and back pressure respectively.



The back pressure condition is to increase the water pressure from the steel pipe on the side wall of the nt square platform, and observe the combination of the composite geomembrane and NT. Because the top composite geomembrane is stretched and deformed during the pressurization process, the internal pressure is reduced, thus improving the necessary stability of the top pressure cover. The positive pressure condition is to add water to the pressure tank stabilized on the outer surface of the NT to observe whether the concrete side wall has water leakage, and to check the combination of concrete and composite geomembrane.
Structure and method are the main technical difficulties and key points of the composite geomembrane anti-seepage planning scheme. Only by ensuring the reliable access of the composite geomembrane and the surrounding concrete impervious body and the integrity of the anti-seepage and water-stop, can the safety of the entire anti-seepage system be ensured. In the connection planning of the composite geomembrane and the surrounding concrete structure, in addition to clarifying the connection structure of the composite geomembrane and the rigid building, the stress and strain conditions and possible damage conditions of the composite geomembrane at the connection should be scientifically studied The relevant water stop type and water stop arrangement plan for this kind of connection.
In order to ensure the close connection between the leveling layer and the concrete, the outer surface of the concrete is coated with waterproof coating. The modified asphalt oil, acrylic vinegar and acidic silicone glass glue were used to test the waterproof coating. Data information of flexible leveling layer and waterproof coating. The process of other access methods is basically the same.
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