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Composite geomembrane

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  • PRODUCT DETAILS
  • Product introduction:

    The composite geomembrane (composite impermeable membrane) is divided into one cloth and one membrane and two cloth and one membrane, with a width of 4-6m and a weight of 200-1500g/m2. It has high physical and mechanical performance indexes such as tensile strength, tear resistance and bursting resistance. The product has the characteristics of high strength, good elongation performance, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance and good impermeable performance. It can meet the needs of civil engineering such as seepage prevention, isolation, reinforcement, crack prevention and reinforcement in water conservancy, municipal administration, construction, transportation, subway, tunnel and engineering construction. It is often used for anti-seepage treatment of dams and drainage ditches, as well as anti-fouling treatment of waste yards.

    The composite geomembrane is heated by far infrared in an oven on one or both sides of the film, and the geotextile and geomembrane are rolled together to form a composite geomembrane. With the improvement of the production process, there is also a process of casting method to make composite geomembrane. Its form has a cloth a film, two cloth a film, two film a cloth and so on.

    Geotextile as a protective layer of geomembrane, so that the protection of impermeable layer is not damaged. In order to reduce ultraviolet radiation and increase anti-aging performance, it is best to use the embedding method.

    In the construction, first of all, the sand or clay with small material diameter should be used to level the base surface, and then the geomembrane should be laid. The geomembrane should not be stretched too tightly, and the part buried in the soil at both ends is corrugated. Finally, a transition layer of about 10cm is laid on the geomembrane with fine sand or clay. 20-30cm stone blocks (or precast concrete blocks) shall be laid on the masonry as anti-scour protective layer. During the construction, we should try our best to avoid the stone directly hit on the geomembrane, it is best to lay the film side of the construction of the protective layer. The composite geomembrane shall be connected to the surrounding structures by expansion bolts and steel plate banding, and the connecting parts shall be coated with emulsified asphalt (2mm thick) for bonding to prevent leakage.

    Service life

    In view of some field observation results of composite geomembrane, synthetic materials have certain anti-aging ability in engineering application, so some documents of some countries have made more lenient provisions on their service life, such as the BCH07-74 of the former Soviet Union, the application of polyethylene seepage control structure of earth and rock dams, which stipulates that polyethylene geomembrane can be used for buildings with a service life of no more than 50 years. The conclusion in the article "Long-term properties of polypropylene composite geomembrane geosynthetics" published by the Austrian Linz company wrote: "More than 15 years of field application experience of polypropylene shows that their chemical and biological stability is high, the maximum damage to the fabric is in construction, no major changes after laying, can be expected to exceed 100 years of stability.

    The main mechanism is to cut off the water leakage channel of the earth dam with the impermeability of the plastic film, and to withstand the water pressure and adapt to the deformation of the dam body with its large tensile strength and elongation. The non-woven fabric is also a kind of polymer short fiber chemical material, which has high tensile strength and elongation through needle punching or thermal bonding. After being combined with the plastic film, not only the tensile strength and puncture resistance of the plastic film are increased, but also the surface roughness, the friction coefficient of the contact surface is increased, which is beneficial to the stability of the composite geomembrane and the protective layer. At the same time, they have good corrosion resistance to bacteria and chemical action, are not afraid of acid, alkali, salt erosion, in the use of light, long service life.

    Selection

    There are many domestic manufacturers of geomembrane, and the product specifications are also varied, including one cloth and one membrane, one cloth and two membranes, two cloth and one membrane, two cloth and many membranes. Models are 200g/m2 ~ 1000g/m2, etc., can also be required by the user according to their actual situation, by the manufacturer according to the requirements of separate production.

    Technical Requirements

    ① Process flow

    The composite geomembrane seepage control adopts the section cycle operation of side excavation, side paving, side ramming and side protection.

    ② Base surface cleaning

    The base surface must be cleaned according to the design requirements, which is the key to ensure the anti-seepage effect, especially the sharp stones, tree roots and other sundries should be completely removed, the base surface is not allowed to have local concave and convex phenomenon, the cleaned base surface should be tamped with rammer or tamping plate to make it compact and smooth.

    ③ Laying of composite geomembrane

    When laying the membrane, be sure to lay it from bottom to top. Between the membrane and the membrane and between the membrane and the base surface to flatten tightly, but it is not appropriate to pull the membrane too tightly, generally slightly loose, but can not leave bubbles at the bottom of the membrane. Because the geomembrane is relatively thin and light, it is easy to be blown by the wind before the protective layer is paved, so the area of the geomembrane should not be too large at one time, and it is best to cover the protective layer soil while paving the membrane.

    According to the information provided by the manufacturer, the width of the composite geomembrane is 1.0~1.9m, and the width of 1.9m is selected for this project to reduce the joint materials. The joints are hot-bonded, glued, lapped and so on. The project is designed with glued, and the joint width is 50mm.

    If you find a puncture or tear of the geomembrane, be sure to use three times the damaged area of the geomembrane adhesive patch.

    ④ Protective layer and surface protection

    The protective layer soil material with a thickness of 10cm by geomembrane must be sieved, and particles with a particle size greater than 6mm are not allowed, otherwise the geomembrane will be easily pierced. The protective layer soil material must be compacted by tamping to ensure that the dry bulk density is above 1.5, and sampling and inspection shall be carried out at any time. When backfilling the protective layer and masonry block stone surface protection, it must be placed gently to avoid breaking the geomembrane. Under the block stone protection surface, 100mm thick gravel or gravel cushion shall be paved and filled to prevent the soil material protection layer from being washed due to the influence of water level change, wind and waves, etc. The dry block stone shall be paved by manual hanging line, the stone shall be tightly embedded, the individual weight of the surface block stone shall be more than 48kg, and all gaps shall be filled with small blocks.

    ⑤ Peripheral boundary treatment

    The requirement of peripheral boundary treatment is to connect the composite geomembrane with the surrounding soil closely, block the seepage inlet, cut off the lateral leakage path, prevent seepage water from entering the bottom surface of the geomembrane, form blisters, and burst the geomembrane when the water level of the reservoir drops. Therefore, the surrounding border must be dug to cut off the trough, and the geomembrane embedded in the trough. See the design drawing for the specific arrangement.

    Speaking of composite geomembrane, we must emphasize the national technical standards: GB/T17642-2008, national standards for various specifications of composite geomembrane have specific parameter requirements. According to the process difference, the composite geomembrane is mainly divided into thermal composite geomembrane and coating composite geomembrane.

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