Precautions for the construction of composite geomembrane

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Precautions for the construction of composite geomembrane

Jul 12, 2021

Many people do not understand the construction precautions of composite geomembrane, the following are the general steps:

(1) The use must be buried: the covering thickness should not be less than 30cm

(2) The refurbished anti-seepage system should consist of cushion layer, anti-seepage layer, transition layer and protective layer.

(3) The soil should be solid to avoid uneven settlement, cracks, and the turf and tree roots within the anti-seepage area should be removed. Pave the sand or clay with a small particle size as a protective layer on the contact surface with the membrane.

(4) When laying, the geomembrane should not be stretched too tightly. It is better that the two ends of the soil are buried in a corrugated shape, especially when anchored with rigid materials, there should be a certain amount of expansion and contraction.

(5) During construction, avoid stones and heavy objects directly on the geomembrane. It is best to construct and lay the membrane while covering the protective layer.

Precautions for joints of composite geomembrane:

(1) The joint treatment of composite geomembrane is a key construction procedure, which directly affects the operating life of the project. According to quality inspections, the use of thermal welding is ideal. The heat welding method is to heat the surface of the PE geomembrane to melt the surface, and then use pressure to fuse it into one.

(2) The composite geomembrane is best to be laid in a certain direction, and a certain PE film and PET non-adhesive layer are reserved on both sides of the geomembrane. When laying, the direction of each unit of the geomembrane should be adjusted to facilitate the welding of the two units of geomembrane. . ,

(3) After the composite geomembrane is laid, it should be pressed with a sand bag to prevent wind movement, and there must be no dirt, moisture, dust, etc. at the edge joints.

(4) Before welding, adjust the two sides of the PE single film at the seam so that it overlaps a certain wide band, and is flat and without wrinkles.

(5) When welding, it is best to weld by a technician with certain experience, and use a special welding machine for welding. To adjust the temperature and speed.