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  • 0907-2020

    Geotextile laying process instruction manual (the most comprehensive and strictest)

    1. Storage, transportation and handling of geotextile Geotextile rolls should be protected from damage before installation and deployment. Geotextile rolls should be stacked in a place where there is no water accumulation, the height of the pile should not exceed four rolls, and the identification sheet of the roll can be seen. Geotextile rolls must be covered with opaque materials to prevent UV aging. During the storage process, the integrity of the label and the data must be maintained. During the transportation process (including the transportation from the material storage site to the work site), the geotextile roll must be protected from damage. Geotextile rolls that have been physically damaged must be repaired. Geotextiles that are severely worn cannot be used. Any geotextile exposed to leaking chemical reagents is not allowed to be used in this project.

  • 0807-2020

    HDPE smooth geomembrane construction scheme process detailed explanation

    HDPE geomembrane is a kind of waterproof barrier material produced with high-density polyethylene resin as raw material. This kind of material has a high degree of resistance to high temperature, aging, and adaptability to the environment. General tests show that the service life of hdpe geomembrane can be long. It has been widely used in the fields of environmental protection and aquaculture for more than 50 years. Here is how to construct it:

  • 0607-2020

    Construction scheme and coordination measures of HDPE Geomembrane laying in slag yard(2)

    6, Geomembrane anchoring requirements ① The anchorage shall not disturb the soil at the bottom of the ditch during the excavation process. The bottom of the ditch is flat and free of loose soil. The depth and slope of the ditch wall meet the design requirements; ②Before backfilling the anchored trench, the bottom of the trench should not be soaked with water, and the accumulated water should be discharged in time; ③ The backfilling of the anchoring trench should be timely, and the soil quality of the backfilling soil should meet the design requirements. The backfilling soil should be layered and compacted by a small compaction machine with a compaction degree of not less than 93%; ④During the laying process, prevent any damage to geosynthetics materials due to loading and unloading activities, high temperature, chemical substance leakage or other factors; ⑤ The laying tools shall not damage the normal use function of the geosynthetics materials, and the mechanical equipment used for construction shall not cause obvious scratches on the geosynthetics materials and damage to the surface of the laying substrate; ⑥ When adjusting the overlap width of the material during laying, the connected parts must not be damaged, and the installed geomembrane must not damage the installed geomembrane when adjusting the position; ⑦If construction is carried out on rainy days, construction must be carried out after feasible measures have been obtained and confirmed by the supervisor and the owner’s representative; ⑧ There must be enough temporary ballast (sand bags) during construction to prevent the laid geomembrane from being blown up by strong wind. In the case of strong wind, the geomembrane must be temporarily anchored and installation work suspended.

  • 0607-2020

    Construction scheme and coordination measures of HDPE Geomembrane laying in slag yard(1)

    1. Construction requirements for HDPE geomembrane laying (1) Before laying the HDPE geomembrane, please supervise the engineer to fully confirm the site conditions to ensure that the foundation surface is flat, free of unevenness, no sharp particles and hard debris that may damage the HDPE geomembrane, etc. The quality of the material (various performance indicators, whether there are bubbles, holes, wrinkles, damage, etc. on the surface) is sent to a third-party authority for strict inspection and qualified, and then it can be laid after confirmation. (2) Each roll of HDPE Geomembrane should be numbered and laid in order. The geomembrane number should be filed with the supervision engineer for inspection. (3) The geomembrane materials stored on site should not be exposed to sunlight for a long time, and should be kept away from fire sources. (4) During the laying process, the staff shall not wear shoes that damage the geomembrane, and shall not smoke at the laying site for other activities that may damage the geomembrane. (5) The soil-proof bag should be placed on the soil bag in time to prevent it from being blown by the wind. (6) The outdoor laying and welding of geomembrane should be carried out in a weather with a temperature above 5°C and a wind force below 4 without rain or snow. (7) No vehicles are allowed to pass directly on HDPE geomembrane and non-woven fabrics, nor are metal or sharp tools such as shovel used on HDPE geomembrane and non-woven fabrics. (8) During construction, try to avoid the shrinkage, wrinkle phenomenon or stress of the material due to temperature changes. (9) During the welding process of HDPE geomembrane, the supervision engineer should be promptly inspected for the operation procedures, laying, and welding quality, and if there is a quality problem, it should be repaired in time. (10) There should be no tree roots and obvious spiked materials in the anchor trench of the geomembrane platform. (11) Location of welding seam and welding technical requirements ① When laying the geomembrane on the pit slope, the lap joint should be parallel to the direction of the slope, and the position of the lateral lap weld of the slope should be more than 1.5m away from the bottom edge of the slope. ② The seam setting and irregular geometric shape at the corner should be minimized as much as possible. ③ No formal welding shall be started until the samples welded by the welding equipment have not passed the test welding inspection or confirmed by the supervision engineer. ④Before welding, dust, dirt and other foreign objects on the surface of the geomembrane must be cleaned. ⑤ The overlapping part of the two welding geomembrane shall not be less than 10㎝. ⑥If the ambient temperature is lower than 5℃ or higher than 40℃, construction is not allowed. ⑦ Welding adopts double-weld lap welding. Extrusion welding is only used for repairing (repairing, covering) and where the welding equipment cannot be reached. ⑧ The joint strength of the weld should be greater than the strength of the base metal. (12) There are enough welding construction equipment on the construction site to ensure the continuous welding construction.

  • 1206-2020

    Product application: application of high-strength geocell in municipal engineering

    The applications of geocell: 1. Used for stabilizing railway subgrade;      2. Used for stabilizing highway subgrade;      3. Embankment and retaining wall used to bear load;      4. Used for shallow water channel management;      5. Used to support pipelines and sewers;      6. Mixed retaining wall used to prevent landslide from bearing gravity;      7. For independent walls, docks, breakwaters, etc.;      8. It is used to control deserts, beaches, river beds and river banks.

  • 1106-2020

    Several types of composite geomembrane and construction techniques

    Composite geomembrane is a member of a large family of geosynthetic materials. It is widely used in highways, railways, water conservancy, large buildings, power plant ash dam construction, non-ferrous metal tailings treatment, environmental protection engineering, water and soil conservation, etc. The service life of the composite geomembrane is mainly determined by whether the plastic film loses its anti-seepage and water-blocking effect. According to the national standards, a 0.2cm thick polyethylene film with stabilizer for hydraulic engineering is used under clean water conditions. The working period can reach 40~50 years, and the working period under sewage conditions is 30~40 years. Therefore, the service life of composite geomembrane is enough to meet the service life of dam anti-seepage requirements.

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