Characteristics of HDPE Geomembrane
HDPE geomembrane as a new material, HDPE geomembrane has excellent anti-seepage, anti-corrosion performance, good chemical stability, and can be processed according to the needs of actual engineering features and functions, HDPE geomembrane produced by plastic geonet manufacturers has been widely used in hydraulic engineering Seepage prevention of embankments, dams, and reservoirs, and HDPE geomembrane is also used as anti-seepage, anti-corrosion, anti-leakage, and anti-moisture in channels, reservoirs, sewage tanks, swimming pools, building construction, underground buildings, garbage dumps, environmental engineering, etc. Material use. Developed countries have widely used this technology since the 1930s, and my country has gradually promoted the use of HDPE geomembrane in various projects since the 1980s.
The performance characteristics of HDPE geomembrane are as follows
1. HDPE high quality plastic geonet is a flexible waterproof material with a high anti-seepage coefficient (1×10-17 cm/s);
2. HDPE geomembrane has a good heat resistance and cold resistance, and its use environment temperature is high temperature 110 ℃, low temperature -70 ℃;
3. HDPE geomembrane has good chemical stability and can resist the corrosion of strong acid, alkali, and oil, which is a good anticorrosive material;
4. HDPE geomembrane has a very high tensile strength so that it has a high tensile strength to meet the needs of high-standard engineering projects;
5. HDPE geomembrane has strong weather resistance, strong anti-aging properties, and can be used for a long time to keep the original performance;
6. The overall performance of HDPE geomembrane produced by HDPE geonet manufacturers, HDPE geomembrane has strong tensile strength and elongation at break, so that HDPE geomembrane can be used in a variety of harsh geological and climatic conditions. Adapt to geological uneven settlement strong strain;
7. HDPE geomembrane uses high-quality primary plastics and carbon black particles without any preservatives. HDPE has been used in my country to replace PVC as a raw material for food packaging bags and plastic wrap.
1. The base surface requirements of geomembrane construction
The surface of the installation base should be tamped and leveled, and sharp objects such as tree roots, stones, glass, and iron nails should be removed; the base’s yin and yang corners should be trimmed and rounded, and the radius of the corners should be ≥50cm. The welding seam surface must be cleaned; in civil engineering, supervision, and owners 1. The construction party can carry out high quality HDPE geonet construction after signing and accepting the acceptance
2. Climate requirements for geomembrane construction
The temperature should generally be above 5°C. The HDPE geonet for sale should be tense at low temperatures and relaxed at high temperatures. Geomembrane installation and construction should be appropriately pre-released by 2% to 5% according to the specific site conditions and climatic conditions at that time; the wind force is below level 4; when the temperature is too low, it is generally not allowed to construct in windy and rainy weather above level 4; When weather and wind affect geomembrane construction, the geomembrane to be welded should be pressed firmly with large stones or sandbags.
3. Laying of geomembrane
The laying of geomembrane is that the arrangement direction of the joints in the entire anti-seepage system is parallel to the maximum slope foot line, that is, arranged along the slope direction. When laying the polyester geogrid factory price, we should strive for the least weld seam. On the premise of ensuring quality, we should save raw materials as much as possible, and it is also easy to ensure quality. Usually, in corners and deformed sections, the joint length should be as short as possible. Except for special requirements, on slopes with a slope greater than 1:6, within the range of 1.5m from the top slope or the stress concentration area, no welding seam should be provided. When laying the geomembrane produced by uniaxial plastic geogrid manufacturers, artificial wrinkles should be avoided. When the temperature is low, it should be tightened and flattened as much as possible. After the installation of the geomembrane, you should minimize walking and moving tools on the membrane surface. Anything that can harm the geomembrane should not be placed on or carried on the membrane to avoid accidents. damage. The more critical process is to unpack and inspect the appearance of the geomembrane before laying the film, and record and repair the mechanical defects and production trauma, holes, breakage, and other defects that have been found. Before cutting the high quality uniaxial plastic geogrid, measure its relevant size, and then cut it according to the actual situation. The width of the seam between the film and the film during the laying of the film is 10cm ~ 15cm so that the direction of the seam arrangement is parallel to the maximum slope foot line, that is Arrange along slope direction
4. Welding of geomembrane
The welding of the geomembrane uses a dual-drive self-propelled uniaxial plastic geogrid for sale welding machine, which uses dual-track hot-melt welding. For parts that cannot be welded by the welding machine, an extruded hot-melt welding machine should be used, equipped with a welding rod of the same quality as the raw material, to form a single weld of the surfacing; the welding process of the welding machine is divided into adjusting pressure, setting temperature, setting Speed, welding seam lap inspection, loading film into the machine, starting the motor; there should be no oil dirt or dust at the seam, and the lap section of the geomembrane should not have debris such as sand, dew, moisture, etc. It must be cleaned up before welding; at the beginning of each day of welding, a sample of 0.9 mm X 0.3 mm should generally be tested on-site, with a lap width of not less than 10 cm, and a peel and shear test conducted on-site. After passing the test, the speed, pressure, and temperature adjusted at that time can be used for welding. When welding the fiberglass geogrid factory price, the welding machine needs to pay attention to the operation of the welding machine at any time, and the speed and temperature should be fine-tuned according to the actual situation on the spot; the welding seam should be neat and beautiful, and there must be no slip welding or jumping away; When the length of the geomembrane is not enough, it is necessary to splice in the long direction. The transverse weld should be welded first, and then the longitudinal seam should be welded. The distance between the transverse welds is greater than 50cm should be T-shaped, and the cross should not be crossed; When laying the geomembrane, according to the local temperature change range and wholesale fiberglass geogrid performance requirements, set aside the amount of expansion and contraction caused by temperature changes; during rain or when the seam has moisture, dew, or heavy sand, welding cannot be performed, but Except for taking protective measures; when the temperature is lower than 5 ℃, construction should not be carried out according to the specifications. If construction is necessary, the welding machine should be preheated before welding; the high quality gravel geocell should be powered by a generator with good voltage stability When using local electricity under special circumstances, a voltage regulator must be used.
5. Anchorage of geomembrane
There are many methods for geomembrane anchoring: groove anchoring, nail anchoring, expansion bolt anchoring, and fixing of embedded parts. The tailings pond is usually fixed by trench anchoring; the geomembrane should be turned over the bottom of the anchoring trench and rolled up by 100mm-200mm; after laying, the clay material is backfilled. If the tailings pond is constructed in stages, the previous stage should be excavated in each stage Anchor the ditch, overlap the new and old plastic geocells factory price with the weld seam, and then press and refill the soil.
6. To ensure the welding quality, the finished geomembrane should be tested and repaired
The inspection is carried out in three steps, namely visual inspection, inflation inspection, and destruction test. The visual inspection is mainly to conduct a detailed inspection of the appearance of the low price HDPE geocell, the quality of the weld, the T-welding, the base debris, etc. All construction personnel should carry out this work throughout the construction process; in addition to the visual inspection, if there is If necessary, vacuum detection and air pressure detection can also be used. The inflation strength of inflation pressure detection is 0.25mpa, and there is no air leakage for 5 minutes. Considering that the coil is soft and easy to deform, the pressure is allowed to drop by 20%; when performing a tensile test (destruction test), The standard is that when the peeling and shearing tests are performed, the weld is not torn and the base material of the geomembrane is torn and damaged, and the welding is qualified at this time; the appearance inspection shows that the dimple drainage board manufacturers surface has holes and other defects that damage the welding process In case of leakage welding, virtual welding, damage, etc., it should be repaired with fresh base material in time, and the repair scar will exceed the damaged part by 10cm-20cm on each side.
7. Matters needing attention in geomembrane construction
The power cords towed by the hot air gun, grinder and geomembrane welding machine must be kept away from their working parts to the greatest extent to avoid damage to the brain wires and electric leakage; except for hot air welding, the mouth of the hot air gun is in any case Do not contact the filament nonwoven geotextile factory price surface, and keep it as far away as possible from the geomembrane surface, human body, machinery and other objects; when the welder is not in use, it should not be placed directly on the geomembrane surface, it should be placed on the bracket or sandbag belt; the geomembrane After the used knife is used, the blade should be returned to the knife box immediately; all temporary small tools used on the site should be placed in the toolbox in time after use; it is strictly prohibited to remove the gun head from the geomembrane extrusion welding machine The solder material underneath is directly discarded on the surface of the geomembrane; smoking is prohibited on the construction site of the high quality filament nonwoven geotextile, no shoes with iron nails or high-heeled hard-soled shoes are allowed to walk on the membrane surface, and all activities that may damage the finished geomembrane are not allowed.