Composite geomembrane

2019-07-31 15:37 Source:原创 Writer: Steven,kathy
The composite geomembrane is a water-impermeable material made of geotextile and geomembrane composite. It is mainly used for anti-seepage. The composite geomembrane is divided into a film and a film, a width of 4-6m and a weight of 200- 1500g/m2, high physical and mechanical properties such as tensile, tearing and bursting can meet the needs of civil engineering such as water conservancy, municipal, construction, transportation, subway and tunnel. Because it uses polymer materials and anti-aging agent is added to the production process, it can be used in unconventional temperature environments.

The composite geomembrane (composite anti-seepage film) is divided into a cloth one film and two cloth one film, the width is 4-6m, and the weight is 200-1500g/m2, high physical and mechanical properties such as tensile strength, tear resistance and bursting. The product has high strength, good elongation performance, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance and good anti-seepage performance. Features. It can meet the needs of civil engineering such as anti-seepage, isolation, reinforcement, anti-cracking and reinforcement in water conservancy, municipal, 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 heating on one or both sides of the film, and the geotextile and the geomembrane are pressed together by a guide roll to form a composite geomembrane. With the improvement of the production process, there is also a casting process for composite geomembrane. The form has a cloth one film, two cloth one film, two film one cloth and the like.

The geotextile acts as a protective layer for the geomembrane, so that the anti-seepage layer is protected from damage. In order to reduce ultraviolet radiation and increase anti-aging properties, it is best to use the embedding method.

In the construction, firstly, the sand surface or the clay with a smaller diameter should be used to level the base surface, and then the geomembrane is laid. The geomembrane should not be stretched too tightly. The soil embedded at both ends is corrugated. Finally, a layer of 10 cm or so of a transition layer is laid on the geomembrane. A 20-30cm block stone (or 砼 prefabricated block) is placed as an impact protection layer. During construction, efforts should be made to avoid the stone directly on the geomembrane. It is best to carry out the construction of the protective layer while laying the film. The joint of the composite geomembrane and the surrounding structure shall be anchored by expansion bolts and steel strips, and the joints shall be coated with emulsified asphalt (thickness 2mm) to prevent leakage.

In view of the fact that the composite geomembrane part of the field observation results of synthetic materials have certain anti-aging ability in engineering applications, some countries have made more limited provisions on their useful life in some documents, such as the former Soviet Union BCH07-74 "earth rock dam application" Polyethylene anti-seepage structure instructions, polyethylene geomembrane can be used for buildings with a life of not more than 50 years. The conclusion of the article "Long-term traits of polypropylene composite geomembrane geosynthetics" published by Linz, Austria, reads: "The field application experience of polypropylene for more than 15 years shows that their chemical and biological stability is high, fabrics The maximum damage is during construction, there is no major change after laying, and stability over 100 years can be expected.

The main mechanism is to block the water leakage passage of the earth dam by the impermeability of the plastic film, to withstand the water pressure and adapt to the deformation of the dam with its large tensile strength and elongation; and the non-woven fabric is also a polymer short fiber chemistry. The material has high tensile strength and elongation by needle punching or hot tack forming. When combined with plastic film, it not only increases the tensile strength and puncture resistance of the plastic film, but also the rough surface of the non-woven fabric. 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 chemicals, and are not afraid of acid, alkali and salt erosion. They have a long service life in the case of avoiding light.

Folding suggestion
    1. Strengthen the protection and management of composite geomembrane products, improve the waterproof awareness of relevant construction personnel, and put into normal operation on time to ensure the quality of the project. It is of great significance.
    2. It is recommended that the contractor notify and dispatch a special person to supervise. The construction personnel related to the waterproof material find that the composite geomembrane is damaged, and it is necessary to promptly notify the waterproof construction personnel to repair it.
    3. The composite geomembrane shall be protected from oil stains, otherwise the bonding strength will be reduced. Storage and Protection "See Introduction to Geomembrane Construction Methods".
    4. It is recommended that the project pay attention to the following links:
    (1) After the composite geomembrane is welded to the finished product, the lake bottom mortar protective layer must be made first.
    (2)The bridge foundation is waterproof, and the steel-penetrating welding method is adopted. The mortar protective layer is used to prevent the quality hazard caused by the electric welding.
    (3)The combination of composite geomembrane and wall surface shall prevent the appearance of large-area hollow drums.

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