Views: 0 Author: Site Editor Publish Time: 2022-10-20 Origin: Site
HDPE geomembranes are widely used in landfill bottom containment structures because of their good durability and low permeability. Studies have shown that it takes tens or even hundreds of years for the pollutants generated by waste degradation to be completely purified naturally, which requires HDPE geomembranes, an important part of the impermeable layer, to have a long service life to prevent the penetration of pollutants. When laying HDPE geomembrane smooth, some points should be noted to achieve the desired results.
Here is the content list:
Problems to be noted when laying HDPE geomembranes
How to install HDPE geomembrane properly?
HDPE geomembranes should be laid before the civil works with the corresponding qualified acceptance documents. Before cutting HDPE geomembrane, its relevant size should be accurately measured and then cut according to the actual size, generally, it is not suitable to cut according to the size shown in the drawing, it should be numbered piece by piece and recorded in detail on the special form. HDPE geomembrane should be laid with the least number of welded seams to save raw materials as much as possible under the premise of quality assurance. It is also easy to ensure quality. The lap width of the seam between the membrane and the membrane is generally not less than 10cm, usually just make the weld seam arrangement direction parallel to the maximum slope, that is, along the slope direction. Usually, in corners and deformed lots, the seam length should be as short as possible. In addition to special requirements, on slopes with a slope greater than 1:6, within 1.5 meters from the top slope or stress concentration area, there should be no welded seam as far as possible.
HDPE geomembrane should avoid artificial wrinkles in laying, and should be stretched as tightly as possible and laid flat when the temperature is low. After the HDPE geomembrane is laid, walking on the membrane surface and moving tools should be minimized. Any objects that can cause harm to the impermeable membrane should not be placed on the membrane or carried on the membrane to avoid accidental damage to the membrane
Welding is performed when connecting geomembranes. But pay attention to the seam shall not have oil, dust, HDPE geomembrane lap section surface should not be sand and other debris, when there is debris must be cleaned before welding. Weld seam requirements are neat, beautiful, no-slip welding, jumping away phenomenon. In the event of a geomembrane, length is not enough, the need to splice in the long direction should first weld the horizontal seam and then weld the longitudinal seam, the horizontal weld distance is greater than 50cm, and should be T-shaped, not cross. Adjacent geomembrane welds should be staggered lap as far as possible, the node formed between the membrane blocks should be T-shaped, minimize cross-shaped, longitudinal mode to the intersection of the weld should be reinforced by extrusion welder.
When welding the membrane, do not press out the dead fold, when laying the HDPE geomembrane, according to the local temperature change and HDPE geomembrane performance requirements, set aside the temperature change caused by the expansion and contraction deformation amount. During the rainy period or joints with moisture, dew, or sand can not be welded. Geomembrane should be powered by a generator with good voltage stabilization performance when welding, and a voltage regulator must be used when local electricity is used in special cases.
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