Quality inspection method of HDPE geomembranes in seepage-proof construction 1: Civil engineering qualified acceptance supporting documents must be issued before paving seepage-proof membranes. 2: Sizes should be accurately measured before cutting the seepage-proof membranes, and then cut in accordance with real sizes, generally it should not be cut according to the icon sizes, and it should be numbered by sheet, and be recorded in detail on special forms. 3: The welding lines should be kept to a minimum range when paving seepage-proof membranes, on the premise of quality assurance, raw materials should be saved. Meanwhile it is easy to ensure the quality. The lapping width of seams between membranes is generally no less than10 cm, the orientation of welding lines is usually parallel to the maximum gradient, namely, arranging along the direction of the gradient. 4: Usually in corners and abnormal sections, the seams should be as short as possible. Apart from special requirements, when the proportion of slope to slope crest is greater than 1:6 or when the stress concentration region is within the 1.5 meters, welding lines should be avoided.
Pave along a certain direction smoothly with proper tension to adapt a small amount of subsidence. 2. set aside 10 cm along the edges of geomembrane, use professional heat-welding welder during welding, and use sack closers to stitch geotextile. 3.as for paved geomembranes edge, oil stains, water, dust and so on can not be found in seams of geomembranes so as not to affect the quality of welding. 4. PE single films on both sides of seams must be adjust well before welding, then reserve a certain with before lapping, and the lapping width is generally 6 to 8 cm which needs to be smooth and wrinkle-free. 5. construction procedures: weld PE film stitch the understratum cloth turn over the cloth and stitch the upper cloth
Composite geo-membrane is an ideal impermeable material which has been widely used in channels, dykes, artificial landscape lakes, plain reservoirs, seepage control and reinforcement of unsafe reservoirs and seepage control of rock-fill dams and other water conservancy projects.
