Before laying HDPE geomembrane, there should be qualified acceptance documents of civil engineering. 2. Before cutting HDPE membrane, its size should be accurately measured, and then cutting according to the actual size, it commonly should not be cut according to the actual size but should be numbered one by one, and be detailedly recorded on the special form. 3. When laying HDPE geomembrane, welding line quantity should be controled, on the premise of guaranteeing quality, we should try best to save raw materials. At the same time, it's easy to ensure the quality. 4. The joint width of seam between film and film is generally more than 10 cm, usually make the welding line direction parallel to the maximum gradient, namely along the gradient direction. 5. Usually, in a corner and abnormal section, seam length should be shorten as far as possible. In addition to the special requirements, in slope greater than 1: Within the scope of 1.5 meters away from the slopes top or the stress concentration area, welding line should not be set up as far as possible. 6. While laying HDPE geomembrane, in order to avoid artificial fold, when the temperature is lower, we should try to tighten, paving the film. 7, after paving the HDPE geomembrane, walking or moving tools on the film should be avoided as far as possible, the things that will danger the HDPE geomembrane should not be placed on the fil, or carried while walking on the film, to avoid the accidental harms.
Composite geomembrane is divided into a cloth a membrane and two film can be widely used in water conservancy dam, highway, airport, drainage, building, environmental protection and other fields can be up to 6 meters in length, the thickness of the membrane material from 0.2 mm - 0.8 mm protective layer of geotextile from 100 g/m2, 800 g/m2, compared to similar products with same breadth, it has reduced the splicing and speed up the construction progress, but also decreased the hidden trouble caused by improper handling; Compared with the traditional cloth and film isolation, the composite geomembrane has increased the stability of product, save the project time, reduce the engineering cost, comprehensive benefit is obvious; composite geo-membrane is paved in embedment, has long durability, good aging resistance, hydraulic?pressure resistance, corrosion resistance, high strength, wearing resistance, low temperature resistance, non-toxic, good drainage function of plane, excellent seepage-proof function; composite geo-membrane has unique thermal insulation, moisturizing, frost?prevention and antifreezing function.
1, construction preparation: 1) composite geomembrane materials quality testing, this project used composite geomembrane is two cloths film one film composite geo-membrane, 2) clean up embankment slope, flat ground, remove all sharp corner sundries, backfill and tamppile the slope is qualified acceptance after supervisor, providing working surface for the pavement of composite geo-membrane. 3) as for geomembrane split joint, for the sake of convenient construction, ensure the quality of split joint, composite geomembrane should as far as possible use wide range, decrease the field splice quantity , before construction, in accordance with the requirements of composite geomembrane width and scene length demands, it should be cut inside the unit, and spliced into the required size block, to roll it on the steel pipe, manual handling it to the working face. 2, 1) composite geomembrane pavement, 1) the laying method of composite geomembrane, compound geomembrane pavement is divided into paving of canal bed and slope paving two parts. Paving method: rolly paving it in axis direction of canal. slope paving, after qualified acceptance of slope, roll along the axis of the slope, and connect to composite geo-membrane in T-shape. 2) composite geo-membrane's pavement should be processed in dry and warm weather, in order to be convenient for split joint, prevent stress concentration, compound geomembrane pavement should take the wavy relaxation method, surplus degrees is about 1.5%, timely pull away after being open, and it requires that the composite geomembrane should be flat and smooth with slope surface, without ridges fold, construction personnel should wear flat soft cloth shoes or rubber shoes, it is forbidden to wear cleats, lest trampled geomembrane, if geomembrane is destroyed during construction, it should be repaired in a timely manner. 3) composite geo-membrane's split joint.
1) clean up embankment slope, flat ground, remove all sharp corner sundries, backfill and tamp, pile the slope is qualified acceptance by supervisor, providing a operating face for paving the composite geo-membrane. 2) as for geomembrane split joint, for the sake of convenient construction, ensure the quality of split joint, composite geomembrane should as far as possible use wide range, decrease the field splice quantity , before construction, in accordance with the requirements of composite geomembrane width and scene length demands, it should be cut inside the unit, and spliced into the required size block, to roll it on the steel pipe, manual handling it to the working face.
