1, the geomembrane should be extended from the bottom to the high position and should not be stretched too tight with 1.50% of height left in case of local subsidence. Considering the actual situation of the project, the side slope should be paved from top to bottom. 2, adjacent longtudinal joints should not be in a horizontal line and should be staggered over 1m. 3, longtudinal joints should be more than 1.50M away from dam toe and the corner of clubfoot and it should be put on the plane. 4, it should be laid at the side slope and then the bottom. 5, When the side slope is laid, the direction of the film should be parallel to the maximum gradient line.
When the temperature is below 5 degrees Celsius, construction should not begin in accordance with the requirements of the specification. If the construction must begin, the welding machine should be preheated before welding. 6 4 the welding line must be neat and beautiful, and there must be no slide welding and hopping. When the geomembrane is laid, telescopic deformation caused by temperature change should be reserved according to the varied range of local temperature and the properties of the geomembrane. 2 The joint of the geomembrane must not have oil as well as dust and the overlapping section of the geomembrane should not be have debris like sand and mud. The debris must be cleaned before welding. 12 the welding line of adjacent welding seam should be lapped staggerly. 9 Before the welding starts everyday, a sample of 0.9mm×0.3mm should be test welded on the scene. 5 13 When welding the geomembrane, electric generator of great voltage regulation performance should be used to supply power and voltage?stabilizer must be used when using local electricity under special conditions.
