Geotechnical materials are relatively important engineering materials in many engineering projects, such as anti-seepage projects such as water conservancy projects and landfills, which are inseparable from these materials.
Geotechnical materials include: geomembrane, geotextile, geogrid, geotechnical mat, geonet, plastic blind ditch, plastic drainage board, soft permeable pipe, bentonite waterproof blanket, three-dimensional vegetation net, grass grid, etc.
However, when we purchase geomembranes, we will find that there are many types of geomembranes. Next, let us get to know geomembranes together.
The difference between composite geomembrane and geomembrane
- Different implementation standards
The implementation of geomembrane GB/T17643-2011 or CJ/T234-2006.
Implementation of composite geomembrane GB/T17642-2008
- The production process is different
Geomembrane is a plastic film made of PE material. The production process is mainly through melting PE resin, and then using extrusion equipment to extrude the melted PE resin. into a stretchable film. According to different materials, it can be divided into HDPE geomembrane, LDPE geomembrane, LLDPE geomembrane and PVC geomembrane. In addition to good anti-seepage effect, geomembrane also has high tensile performance and acid resistance, and has a long service life. It is mainly used in municipal anti-seepage projects, aquaculture anti-seepage projects, landfill anti-seepage projects, tailings treatment field anti-seepage projects, reaction tank anti-seepage projects, rainwater collection pond anti-seepage projects, etc.
(2) Composite geomembrane:
Composite geomembrane is a kind of geotechnical anti-seepage material based on geomembrane and composite geotextile on one side or both sides. The production process is mainly divided into two types, one is calendering process, and the other is thermal compounding process. Although the principles of the two processes are different, both geotextiles need to be produced. The calendering process is to send it and the geotextile to the rollers at the same time for backlog forming during the production of the geomembrane; After both are produced, the two are compounded together through a heat sealing process. It can be divided into one cloth and one film and two cloth and one film, with a width of 4-6m and a weight of 200g. The production workshop of geomembrane is 1500g/㎡. It has high physical and mechanical properties such as tensile resistance, tear resistance, and bursting. Good performance. Commonly used terms are anti-seepage treatment of dams and drainage ditches, and anti-pollution treatment of waste yards.
- Different construction methods
①Extend from the bottom to the high position, do not pull it too tightly, and leave a margin of 1.50% for partial sinking and stretching. Considering the actual situation of this project, the slope shall be paved from top to bottom;
② The longitudinal joints of two adjacent panels should not be on a horizontal line, and should be staggered by more than 1m;
③ The longitudinal joints should be more than 1.50m away from the dam foot and the bend foot, and should be located on a plane;
④The side slope first and then the field bottom. When the side slope is laid, the film spreading direction should be basically parallel to the maximum slope line.
⑤ After laying, start welding.
(2) Composite geomembrane: Geotextile is used as the protective layer of geomembrane to protect the anti-seepage layer from damage. In order to reduce ultraviolet radiation and increase anti-aging performance, it is best to use the embedded method to lay. During construction, the base surface should be leveled first with sand or clay with a small material diameter, and then the geomembrane should be laid. The geomembrane should not be stretched too tightly, and the parts buried in the soil at both ends are corrugated. Finally, a transition layer of about 10cm is laid on the geomembrane with fine sand or clay, and 20-30cm of stone (or concrete) is laid on it. prefabricated blocks) as the anti-scour protection layer or directly concrete tamping. During construction, try to avoid stones falling directly on the geomembrane. It is best to construct the protective layer while laying the geomembrane.
Composite geomembrane cost calculation method:
The price of composite geomembrane = weight per square meter * ex-factory ton price
For example: the total gram weight of the composite geomembrane is the gram weight of the cloth on both sides + the gram weight of the geomembrane = 400 grams, the price of the 400g national standard composite geomembrane = the ton price of the national standard composite geomembrane 9600/ton X 400g, and the specification is calculated from this The ex-factory unit price of the composite film is 3.84 yuan per square meter.
Distribution area and well-known brands of geotechnical material manufacturers
- Main distribution areas of geotechnical material manufacturers
At present, Hefei, Anhui Province is the main concentration of geotechnical material manufacturers. The number of geotechnical material manufacturers in Anhui Hefei can currently account for about 80% of the national geotechnical material manufacturers. However, the geotechnical material manufacturers in Hefei, Anhui have different product focus. The geotechnical material manufacturers in Hefei, Anhui mainly produce geotextiles, geomembranes, composite geomembranes and waterproof blankets. This series of products are mainly used in landfills, Seepage prevention of water conservancy projects such as tailings treatment plants, sewage pools, canals and reservoirs. The geotechnical material manufacturers in Tai’an, Shandong mainly produce geogrids, geotextiles and tunnel waterproof panels. These products are mainly used in reinforcement projects and anti-seepage projects for highways, high-speed railways and tunnel culverts.
- Famous brand of geomembrane
Well-known geomembrane brands include: Soma Canada, GSE America, AGRU Austria, Antafe Spain, Huiguang Taiwan, Novi Germany
Directory of Geotechnical Material Manufacturers in Guangdong, Guangxi and Sichuan
Geomembrane latest quotation list
Questions and answers about geotechnical materials
Q: What are the specifications of geotextiles?
A: Commonly used geotextiles are classified into filament geotextiles and short-filament geotextiles, and their weight ranges from 100 to 800g/㎡, that is, the weight per square meter. Size specifications: width 1~6m, length can be customized.
Q: How much does a roll weigh?
A: Weight = area (length * width) * gram weight;
For example: the width is 6 meters, the length is 50 meters, and the specification is 300g/㎡, then the weight of a roll is: 6m50m300g=90kg.
Q: What are the length and width? How many square meters is a roll?
A: The width is 1m~6m, and the large width can reach 7m (less), and the length can be customized according to requirements. For the convenience of transportation and handling, the recommended size is 6m wide and 50m long. Single roll square = width * length.
Q: How much is a roll of geotextile or geomembrane?
A: Price per roll = unit price per square meter * area per roll.
Q: What is the difference between geotextiles and non-woven fabrics?
A: Geotextiles are divided into woven and non-woven. It is a permeable geosynthetic material made of synthetic fibers through needle punching or weaving. Non-woven fabrics for engineering generally refer to filament or short-filament geotextiles, and woven geotextiles for engineering are generally organic woven geotextiles.
Q: What are the common specifications of geomembrane?
- One cloth and one film (cloth: 100-1000g/m2 film thickness: 0.1-1.5mm)
- Two cloths and one film (cloth: 80-600g/m2 film thickness: 0.2-1.5mm)
- One cloth with two films (cloth: 100-1000g/m2 film thickness: 0.1-0.8mm)
- Multi-cloth and multi-film (cloth: 100-1000g/m2 film thickness: 0.1-0.8mm)