The useful life of geomembrane problem, mainly by the loss of impermeable impermeable plastic film whether action may be, according to the Soviet national standard wholesale geomembrane, with a thickness of 0.2m hydraulic plus stabilizers of polyethylene film, Under the conditions of working life in water up to 40 to 50 years, working in conditions of life under water 30 to 40 years. Therefore, the useful life of geomembrane sufficient to meet the requirements of the useful life of the dam seepage. Planted roof drainage board materials and plastic drain major equipment: (1) plastic drain (each batch using HDPE plastic drainage board shall be subject to inspection specified inspection department, and with factory certification and planted roof drainage board test Inspection reports should be used with regular checks of the film coat plastic drainage board is intact). Graded gravel should be processed weak weathered sandstone, clay content should not exceed 5% of practical geomembrane, and remove impurities, plants, graded gravel particle size control: maximum particle size no larger than 5cm by quality 16mm sieve percentage of not less than 85%, by mass percentage 0.3mm sieve shall not exceed 20%. (2) applied to the drainage board to play a major construction machinery set up to fight plastic drain device has two forms: one for crawler piling machine, one for the gantry flapper machine (with a guide). Require energy into the design depth of the static type or vibrating equipment is unavailable or flush hammer. Cannula insertion rod is flat or round, diameter greater than the size of the drainage board, drainage board design is longer than the length of the play set in the protection of the drainage board is not damaged. Also available crane hammers change working device and simple flapper machine. Fuyang geomembrane | Edison new materials | best geomembrane provided by New Materials Co., Edison. Edison New Materials Co., Ltd. (www.fangshenmo.com) strong, credible, in Dezhou site construction materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Edison new materials into the brilliant and you work for a better future!