Jilin Tonghua composite geomembrane has exquisite workmanship

Performance of composite geomembrane Composite geomembrane (composite anti-seepage membrane) is divided into one cloth and one membrane and two cloths and one membrane. Width - weight is for geomembrane production workshop
/ square meter tensile resistance, tear resistance, burst resistance, etc. Products with high physical and mechanical properties have the characteristics of high strength, good elongation performance, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance and good anti-seepage performance. It can meet the needs of civil engineering such as anti-seepage, isolation, reinforcement and anti-crack reinforcement in water conservancy, municipal administration, construction, transportation, subways, tunnels, and engineering construction. Because it uses polymer materials and adds anti-aging agents in the production process, it can be used in unconventional temperature environments. It is often used for anti-seepage treatment of dams and drainage ditches and anti-fouling treatment of waste dumps.
Composite geomembrane construction
Composite geomembrane construction pictures
Composite geomembrane is a composite geomembrane formed by pasting geotextile on one or both sides of the film. Its forms include one cloth and one film, two cloths and one film, two films and one cloth, etc. Geotextile serves as the protective layer of the geomembrane to protect the anti-seepage layer from damage. In order to reduce ultraviolet radiation and increase anti-aging properties, it is best to use the buried method for laying. During construction, sand or clay with a smaller diameter should first be used to level the base surface and then the geomembrane should be laid. Do not stretch the geomembrane too tightly. The parts buried in the soil at both ends will be corrugated. Finally, use fine sand or clay to lay a layer of left and right transition layers on the geomembrane. Lay a stone (or concrete prefabricated block) as an anti-collision protective layer. During construction, efforts should be made to avoid stones hitting the geomembrane directly. It is best to construct the protective layer while laying the membrane. The connection between the composite geomembrane and surrounding structures should be anchored using expansion bolts and steel plate battens. The connection parts should be coated with emulsified asphalt (thick) to prevent leakage.
Construction Precautions
Buried type must be used: the covering thickness should not be less than the renovation anti-seepage system should consist of: cushion layer, anti-seepage layer transition layer, and protective layer. The soil must be solid to avoid uneven subsidence, cracks, and seepage. Turf and tree roots within the anti-seepage range must be removed. Sand or clay with small particle size is laid on the contact surface with the membrane as a protective layer. When laying the geomembrane, do not pull it too tightly. It is better to make the two ends buried in the soil into a corrugated shape, especially when anchoring with rigid materials, a certain amount of expansion and contraction should be left. During construction, it should be avoided that heavy stones and heavy objects are directly hit on the geomembrane. It is best to lay the membrane and cover it with a protective layer during construction.
Joints of composite geomembrane
Seam treatment of composite geomembrane is a key process that directly affects the anti-seepage effect. The general seam methods are: ① Overlap: The overlap width should be greater than ② Heat welding: It is suitable for slightly thicker geomembrane substrates. The weld overlap width should not be less than . Poor.)
Precautions for seams when editing this paragraph
The seam treatment of composite geomembrane is a key procedure in construction, which directly affects the operation life of the project. According to quality inspection, the thermal welding method is ideal. (Special glue can also be used for bonding.) The heat welding method is to heat the connected surfaces of the geomembranes to melt them and then fuse them into one through pressure. It is best to lay the geomembrane in a certain direction with a certain amount of film reserved on both sides. When laying the adhesive layer, the direction of each unit geomembrane must be adjusted to facilitate the welding of the two unit geomembranes. . After the geomembrane is laid, it should be pressed with sand bags to prevent wind movement. The edge joints are required to be free of dirt, moisture, dust, etc. Before welding, it is necessary to adjust the two side single films at the seam so that they overlap a certain wide width and are flat and wrinkle-free. When welding, it is best to have technicians with certain experience weld and use a special welding machine for welding. The temperature and speed should be adjusted (glue can also be used). According to years of practice, it has been proven that the thickness of the geomembrane should not be less than 100%. Too thin may produce pores and be easily damaged during construction, thus reducing the anti-seepage effect. During the construction of geomembrane, special attention should be paid to ensuring that the laying should not be too tight and should not be wrinkled, and the splicing should be firm. It is necessary to carry out construction in strict accordance with technical specifications and ensure five quality checks including preparation, laying, splicing, inspection and backfilling. Due to the good anti-seepage effect of composite geomembrane, this material is widely used in the construction of water-saving renovation and extension supporting projects in Baojixia Irrigation District, and has been widely praised by design and construction units. Sourced from Water Resources Network and has been modified.
Edit this paragraph Features of composite geomembrane
Width: meters The widest composite membrane in China at present Composite geomembrane
Anti-puncture strength, high friction coefficient, good aging resistance Adaptable to a wide range of ambient temperatures and excellent anti-drainage properties. Suitable for projects such as water conservancy, chemical industry, construction, transportation, subways, tunnels, garbage disposal sites, etc. Main technical indicators Remarks.～..～.Breaking strength/bursting strength Vertical and transverse tearing strength . . . . . . . Longitudinal and transversal
Edit this paragraph anti-seepage paving design of composite geomembrane
Characteristics of composite geomembrane
Rough surface anti-seepage membrane composite geomembrane uses plastic film as anti-seepage The anti-seepage performance of the geotechnical anti-seepage material composed of a base material and a non-woven fabric mainly depends on the anti-seepage performance of the plastic film. At present, the plastic films used for anti-seepage at home and abroad mainly include polyvinyl chloride, polyethylene, and ethylene/vinyl acetate copolymer. They are polymer chemical flexible materials with small specific gravity, strong extensibility, and high adaptability to deformation. Corrosion resistance, low temperature resistance and frost resistance. Its main mechanism is to use the impermeability of the plastic film to block the leakage channel of the earth dam. Its greater tensile strength and elongation can withstand water pressure and adapt to the deformation of the dam body. Non-woven fabric is also a kind of polymer short fiber chemical material. Needle punching or hot bonding has high tensile strength and extensibility. When combined with the plastic film, it not only increases the tensile strength and puncture resistance of the plastic film, but also increases the friction of the contact surface due to the rough surface of the non-woven fabric. The coefficient is beneficial to the stability of the composite geomembrane and protective layer. At the same time, they have good corrosion resistance to bacteria and chemicals and are not afraid of acid, alkali, and salt corrosion. Now there is a new type of composite geomembrane - warp knitted composite geomembrane. Warp-knitted composite geomembrane is a new type of geotechnical material made of synthetic fiber (or glass fiber) as reinforcing material and compounded with composite geomembrane. Warp knitted composite geomembrane is different from general composite geomembrane. Its biggest feature is that the intersection points of the longitude and latitude lines are not bent and each is in a straight state. Binding the two firmly with a binding wire can withstand the external force distribution stress in a comprehensive and uniform manner. When the external force is applied to tear the material, the instantaneous yarns will gather along the initial crack to increase the tear resistance strength. When warp knitting is combined, the warp knitting binding thread is used to repeatedly pass between the warp and weft yarns and the fiber layer of the short fiber needle punched non-woven waterproof geotextile to knit the three into one. Therefore, the warp-knitted composite geomembrane has the characteristics of high tensile strength and low elongation as well as the waterproof performance of the composite geomembrane. Therefore, the warp-knitted composite geomembrane is an anti-seepage material that has the functions of reinforcement, isolation, and protection. It is a high-level applied geocomposite material in the world today. The service life of the composite geomembrane is mainly determined by whether the plastic film loses its anti-seepage and water-proofing effect. According to the Soviet national standards, the thickness of the polyethylene film for hydraulic engineering use is . The working life under sewage conditions is ~ years. Therefore, the service life of the composite geomembrane is sufficient to meet the service life of the dam's anti-seepage requirements.
Selection of composite geomembranes
At present, there are many geomembrane manufacturers in China with various product specifications, including one cloth, one membrane, one cloth, two membranes, two cloths, one membrane, two cloths, two membranes, multiple cloths and multiple membranes, etc. Models include /~/, etc. Users can also make requests according to their actual conditions, and the manufacturers can produce them individually according to the requirements. The table... lists the main performance indicators of some products produced by Hunan Vinylon Factory for reference during design. Table Product Main Performance Table Model Specification Index Items One cloth and one membrane composite geomembrane Two cloth and one membrane composite geomembrane Unit area mass deviation (%) First-class product . . . . Qualified product . . . . Thickness first-class product . . . . . Qualified products. . . . . . Longitudinal and transverse strip tensile strength (/) First-class qualified products Ball bursting strength () First-class qualified products Impermeability strength First-class products. Water pressure impermeable . Water pressure does not leak. Water pressure does not leak. Water pressure does not leak. Water pressure does not leak. The appearance of qualified products is first-class. The cloth surface is smooth, there are no holes, the cloth surface and the film are tightly bonded, and there is no delamination. The qualified products are according to the table. ...The main performance of the product is combined with the specific conditions of Zhoutou Reservoir to design a D-type composite geomembrane with two cloths and one membrane. Its specifications are/width.
Design of composite geomembrane anti-seepage body
The composite geomembrane anti-seepage body structure consists of four layers: base surface, composite geomembrane, protective layer, and stone (or concrete) slope protection (as shown below... ) The design of each layer is now described in the following section of the composite geomembrane anti-seepage structure (unit ① membrane base surface design (i.e., dam shell surface treatment requirements)) To prevent the soil layer paved on the composite geomembrane from sliding along its surface to increase protection The stability of the layer (including the protective surface). The surface of the upstream membrane-coated dam shell is excavated into a platform. The height difference of each stage is. The horizontal width is determined according to the slope ratio. The slope is designed to be excavated and formed as shown in the figure... Finally, clean the bricks, stones and roots of trees on the surface and use a clapper to tighten and smooth the surface. ② The composite geomembrane is designed according to the surface... The main features of the product can be designed and selected according to the specific conditions of Zhoutou Reservoir. ③ Protective layer design. The anti-seepage effect of composite geomembrane depends on the integrity of the plastic film during construction and operation. In order to prevent humans and animals from trampling on animals and plants, damage and reduce photothermal effects, because they are high-molecular chemical fiber polymers, Direct sunlight should be avoided in particular, so a protective layer should be laid on the composite geomembrane. The particle diameter of the protective layer should not be too large, otherwise it will puncture the composite geomembrane. Generally, the particle diameter of the protective layer should be approximated by the following formula. Where : d The safety factor of the maximum particle diameter of the protective layer soil material in this project is taken as = [] The tensile allowable strength of the composite geomembrane [] =. The maximum water head it can withstand is =. The thickness of the composite geomembrane is taken as =. (which is the thickness of the plastic film). Substituting the above data into the above formula, we get that for the sake of safety, the maximum particle diameter d of the actual soil material is required to be no larger than sieved silty clay. Therefore, this project uses screened silty clay. Other requirements are the same as those for dam soil filling. The protective layer is removed and screened Use non-sieved soil on top of the soil. Large rocks and other debris should be picked out of the non-sieved soil. ④Surface protection design Because the dam slope is a water-retaining building that must withstand wind and wave pressure, surface protection measures must be taken. The project design adopts dry-laid large stone face protection. The face protection stones must be hard, dense, able to withstand long-term weathering, and have a certain weight that can withstand the pressure of wind and waves and the scouring force of water. The weight and protection of the face protection stones The surface thickness is determined according to the method in Appendix D. of the "Dike Design Code"). In the calculation formula: Main surface protection layer, surface protection stone individual mass, artificial stone weight (/) =/ water weight =/ design slope height = D stability coefficient D =. Block stone surface protection layer thickness, surface protection stone Coefficient of layers. The slope gradient is calculated: ==. Take the thickness of the dry block stone protection =. In order to prevent wind, waves and currents from taking away the clay particles of the dam shell protective layer, gravel (sand gravel) with a thickness of .
Technical requirements for the construction of composite geomembrane anti-seepage body
①Process flow The composite geomembrane anti-seepage of Zhoutou Reservoir Dam adopts the construction process of cyclic operation of edge excavation, edge paving, edge tamping and edge protection. The process is shown in the figure... Figure: Geomembrane anti-seepage construction flow chart ② Base surface cleaning The base surface must be cleaned according to the design requirements. This is the key to ensuring the anti-seepage effect, especially sharp stones, tree roots and other debris must be thoroughly removed. No local unevenness is allowed on the base surface. The cleaned base surface must be tamped tightly with a tamping hammer or tamping board to make it dense and smooth. ③When laying the composite geomembrane, it must be laid from top to bottom. The film should be pressed flat and tightly between the film and the film and the base surface, but it should not be pulled too tight. Generally, it should be slightly loose, but no bubbles should be left at the bottom of the film. Because the geomembrane is relatively thin and very light, it is easily blown by the wind before the protective layer is laid. Therefore, the area covered by the geomembrane at one time should not be large. It is best to cover the protective layer with soil while laying the film. According to the information provided by the manufacturer, the width of the composite geomembrane is .~. The width is selected for this project to reduce the joint materials. Joints include hot bonding, gluing, overlapping and other methods. This project design adopts adhesive joint width. If a puncture or tear is found in the geomembrane, it must be repaired with geomembrane adhesive three times the damaged area. ④ The soil materials for the protective layer and the protective surface that are thicker than the geomembrane must be screened, and particles larger than the above size are not allowed, otherwise the geomembrane will be easily punctured. The soil material of the protective layer must be compacted by tamping to ensure that the dry bulk density is above. Samples must be taken for inspection at any time. When backfilling the protective layer and building block stone protection, be sure to handle it with care to avoid breaking the geomembrane. A thick cushion of gravel or gravel should be laid under the stone protection surface to prevent the soil protective layer from being washed away due to factors such as changes in water level, wind and waves. Dry block stones should be paved with artificial hanging lines. The stones should be tightly embedded in the surface layer and the individual weight of the block stones should be greater than that. All gaps should be filled with small stones. ⑤Peripheral junction treatment The requirements for perimeter junction treatment are to tightly connect the composite geomembrane to the surrounding soil, seal it, block the seepage inlet, and cut off lateral leakage paths to prevent seepage from entering the bottom surface of the geomembrane to form blisters that will rupture the geomembrane when the reservoir water level drops. . Therefore, cutoff trenches must be dug at the perimeter junction and the geomembrane must be buried in the trenches. See the design drawing for specific layout. When talking about composite geomembranes, we must emphasize the national technical standards: - National standards have specific parameter requirements for composite geomembranes of various specifications. According to process differences, composite geomembranes are mainly divided into thermal composite geomembranes and laminating method composite geomembranes.
Edit this paragraph Composite geomembrane is a broad name
Composite geomembrane is a broad name: non-woven geotextile, woven geotextile or woven geotextile and polyethylene are composited with thermal compounding method or polyethylene The direct coating of the membrane can be called composite geomembrane. Some products of composite geotextile and composite geomembrane have different names but refer to the same product. Since geotextile is an emerging material and there is no standardized name, it has caused confusion and irregularity in the definition of geomembrane. Recently, India has developed jute geotextiles - strictly speaking, all membrane-like materials used in civil engineering can be collectively referred to as geomembranes. The so-called composite geomembrane is a combination or connection of two materials that has isolation and anti-seepage effects. Composite material geomembrane.
Edit this paragraph Construction Method of Composite Geomembrane
Do not drag or pull the composite geomembrane during transportation to avoid being stabbed by sharp objects. , should extend from the bottom to the high position and should not be pulled too tightly. There should be a margin of .% to prepare for local sinking and stretching. Taking into account the actual situation of this project, the side slopes should be laid in order from top to bottom. The longitudinal joints of two adjacent panels should not be on a horizontal line and should be staggered above each other. The longitudinal joints should be away from the dam foot and bend foot. The above should be set On the plane, the direction of the membrane expansion should be basically parallel to the maximum slope line when laying the slope first and then the field bottom.
Edit this section on the laying of composite geomembrane
Lay it in a certain direction and do not pull it too tightly. There should be a certain amount of expansion and contraction to adapt to the deformation of the matrix. A certain width of non-adhesive layer between the membrane and the fabric (i.e. flange) is reserved on both sides of the geomembrane. When laying, the direction of each unit geomembrane must be adjusted to facilitate the welding of the two unit geomembranes. After the geomembrane is laid, it should be pressed with sand bags to prevent wind and sand from affecting the welding of the edge of the geomembrane in the next step. . Geomembrane welding and seam treatment are key construction procedures. Generally, the thermal welding method is used to heat the surface of the membrane connection to melt the surface and then fuse it into one through pressure. . For the edge joints of the laid geomembrane, it is required that there should be no oil, water, dust, etc. . Before welding, the two side single membranes at the joints should be adjusted so that they overlap to a certain width. The overlap width is generally ~ and smooth. White wrinkles. Use a special welding machine for welding