Other single film has ldpe geomembrane, eva geomembrane, pvc geomembrane, lldpe geomembrane, ecb geomembrane, and so on. But the most common is hdpe geomembrane, hdpe geomembrane because of low cost, production quality control and stability, strong product performance and stability, is the most commonly used geomembrane products. There ldpe hdpe geomembrane geomembrane geomembrane eva geomembrane, impermeable geomembrane, impermeable membrane, waterproof geomembrane. hdpe geomembrane (impermeable membrane, ldpe impermeable membrane) pavement construction specifications a geomembrane hdpe geomembrane construction method rules laying geomembrane welding two geomembrane seams Note 1 geomembrane hdpe geomembrane construction method of laying Rules 1. Before laying hdpe geomembrane qualified acceptance by the appropriate civil documents. 2. hdpe film before cutting, should accurately measure its relative size, and then press the actual cutting, generally should not be cut by the icon size, should by piece number, a detailed record of the special form. 3. laying hdpe geomembrane should be sought to weld at least, under the premise of guaranteeing quality, try to save raw materials. But also easy to ensure quality. The seams between the membrane and the membrane lap width is generally not less than 10cm, usually arranged in a direction parallel to the weld maximum slope, that are arranged in the direction of the gradient. 5. At the corner and deformity usually lots should be to minimize the short length of the seam. In addition to special requirements, the slope is greater than 1: 6 slope within slope from the top or the stress concentration range of 1.5 m area, as no welds. 6. hdpe geomembrane laying, you should avoid artificially folds, at lower temperatures, should be taut, paved. 7. After completion of the laying hdpe geomembrane, should minimize the membrane surface walking, moving tools, who can cause harm to hdpe film thing, should not be placed on the membrane film or carry walking, so as not to film accidental damage. 1. Hot Wedge Welder welding process is divided into: adjustable pressure set temperature set speed lap weld inspection loading film into the machine to start the motor pressure welding. 2. seams without oil, dust, lap segment hdpe geomembrane surface sediment and other debris should not clip when debris must be cleaned before welding. 3. Welding day begin, you must first try to weld samples at the scene of a 0.9mm × 0.3mm, the lap width of not less than 10cm, and peel and shear test Rally scene, after passing the sample, you can use that time to adjust good speed, pressure, temperature is welding. Be marked on the sample date, time, ambient temperature. Hot wedge welder in the welding process, the need to pay attention to the welding operation, according to the actual situation at the scene to fine-tune the speed and temperature. 4. Weld requirements neat, attractive, not a slip welding, jump away phenomenon. 5. In the event of geomembrane long enough, you need to splice length, should first transverse weld is good, then welded longitudinal seam, the lateral distance greater than 50cm weld into t fonts should not cross. 6. adjacent geomembrane seam welds should be wrong lap junction formed between the membrane block, t fonts should minimize cross, longitudinal mode applied to the weld at the intersection of extrusion welder strengthened. 7. When welding film allowed to press out the dead fold, laying hdpe geomembrane, according to local temperature change range and hdpe geomembrane performance requirements, set aside the amount of stretching deformation caused by temperature changes. 8. When the portable welder temperature welding temperature control as indicated below 200 ℃, use a clean cloth or cotton dust them off and then welded, if necessary re-polish, should hand wipe. 9. When the seams with condensation, when wet, silt and other effects, treatment after welding. 10. There seams during the rain or moisture, dew, or can not be welded case of large sand, but to take protective measures are excluded. 11. When the temperature is below 5 ℃, the construction should be in accordance with regulatory requirements, if necessary, then construction, welder before welding preheat treatment response. 12. extrusion welding machine in the welding process, should always check tips slider, the more serious wear and tear should be replaced sliders to avoid damage the membrane surface. 13. geomembrane should be used in the welding generator power regulator good performance, the use of local power in exceptional cases, you must use the regulator. (1) geomembrane seams processing is the key to the construction program, directly affects the operational life of the project, according to quality testing showed that the thermal welding method is ideal. (Using dedicated adhesive bonding) pe geomembrane thermal welding method is heat-treated in contact with the surface, so that surface melting, and then passed through a fusion into one pressure, (2) geomembrane preferably laid in a certain direction, geomembrane both sides have set aside a certain pe film with pet without adhesive layer, laying geomembrane must adjust to each unit so that the two units geomembrane welding. (3) geomembrane laying, use sand bags to hold him down, to wind action, edge seams request can not have dirt, moisture and dust. (4) To adjust before welding the two side seams pe single film, so that certain broadband lap and smooth, no wrinkles.