What are the requirements for geotextiles in construction

Depending on where you use it, the role of geotextile in each place is different, and the requirements are different. Let's add it.

For example, the basement waterproofing and the concrete protective layer need to be separated by geotextiles. Wait a minute.

What types of geotextiles are divided into, which are mainly divided into anti-geotextiles, non-woven geotextiles, woven geotextiles, and composite geotextiles (composite geomembranes).

Anti-seepage geotextile function: use the good air permeability and water permeability of geotextile to make water flow through, so as to effectively intercept sand erosion. Geotextile has good water conductivity, it can form a drainage channel inside the soil body, and discharge excess liquid and gas in the soil structure.

Geotextiles are used to enhance the tensile strength and deformation resistance of the soil, enhance the stability of the building structure, and improve the quality of the soil. Effectively diffuse, transmit or decompose concentrated stress to prevent the soil from being damaged by external force. Prevent the mixing between the upper and lower layers of sand, soil and concrete.

The strength, thickness, and equivalent pore size depend on the engineering requirements used, such as the reinforcement to emphasize the strength, the thickness of the protection requirements, and the pore size of the filtration requirements.

Geotextile has excellent filtration, drainage, isolation, reinforcement and protective effects, and has the characteristics of light weight, high tensile strength, good permeability, high temperature resistance, freezing resistance, aging resistance and corrosion resistance. The application of geosynthetics originated in the fifties of the twentieth century, the domestic geotextile is one of the country's eight five-year plans, China promulgated the "geosynthetics staple fiber needle-punched nonwoven geotextile" (GB T17638-1998) standard in 1998, geotextiles have been widely used in many fields.

There are three main series of geotextiles:

1. Acupuncture non-woven geotextiles, specifications of 100g m2-600g m2 between arbitrary choice, the main raw material is polyester staple fiber or polypropylene staple fiber, made by acupuncture method, the main use is: river, sea, lake embankment slope protection, sea reclamation, wharf, lock flood control and rescue projects, is through the filtration to soil and water conservation and prevent pipe surge effective way.

Second, needle-punched non-woven fabric and PE film composite geotextile, specifications have one cloth and one film, two cloth and one film, the largest width of the main raw material is to use polyester staple fiber needle-punched non-woven fabric, PE film is made of compounding, the main use is anti-seepage, suitable for railways, highways, tunnels, subways, airports and other projects.

3. Non-woven and woven composite geotextiles, including non-woven and polypropylene filament woven composite, non-woven and plastic woven composite, suitable for basic engineering facilities for foundation reinforcement and adjustment of permeability coefficient.

The geotextile specification GB T17638-2008 is the national standard for staple fiber needle-punched non-woven geotextiles, which stipulates the classification, specifications, codes, technical requirements and quality of staple fiber needle-punched nonwoven geotextiles, experimental methods, testing rules, packaging, marking, storage and transportation, etc.

It stipulates the technical requirements for various specifications of polyester staple fiber needle-punched nonwoven geotextiles, including 100g -800g per unit area. Detailed requirements have been made for the performance of geotextile such as unit area mass deviation, thickness, width, breaking strength, elongation at break, CBR breaking strength, equivalent pore size, vertical permeability coefficient, tear strength and so on.

Geotextile features:

1. High strength, due to the use of plastic fibers, it can maintain sufficient strength and elongation in both dry and wet states.

2. Corrosion resistance, it can resist corrosion for a long time in soil and water with different pH degrees.

3. Good water permeability There are gaps between the fibers, so there is good water permeability.

4. Good anti-microbial resistance to microorganisms and insects.

5. Convenient construction, due to the light and soft material, it is convenient to transport, lay and construct. Rotten town.

6. Complete specifications: width up to 9 meters. It is the widest product in China, with a unit area mass: 100-1000g m2.

Geotextiles that have been severely worn cannot be used. Any geotextile that comes into contact with leaking chemical reagents is not allowed to be used in engineering. X0D X0A 2, the laying method of geotextiles:

The minimum stitch distance from the knitting edge (exposed edge of the material) is at least 25 mm. X0D X0A sewn geotextile seams include a 1-row and thread lock chain seam method. The threads used for stitching should be resin material with a minimum tension of more than 60 N, and have chemical and UV resistance comparable to or exceeding that of geotextiles.

Defective geotextile sheets and stitches must be clearly marked on the geotextile and repaired. X0D X0A B, worn geotextiles must be repaired by laying and thermally connecting small geotextile sheets, which are at least 200mm longer than the edge of the defect in all directions. The thermal connection must be strictly controlled to ensure that the geotextile patch and the geotextile are tightly bonded and that there is no damage to the geotextile.

Geotextile rolls must be covered with opaque material to prevent UV aging. During the storage process, it is necessary to keep the label intact and the information complete. X0D X0a During transportation, including on-site transport from the place where the material is stored to the place of work, geotextile rolls must be protected from damage.

The x0d x0a geotextile roll that was physically damaged had to be repaired. Geotextiles that have been severely worn cannot be used. Any geotextile that comes into contact with leaking chemical reagents is not allowed to be used in this project.

Before overlapping, the geotextiles must overlap at least 150mm. The minimum stitch distance from the knitting edge (exposed edge of the material) is at least 25 mm. X0D X0A sewn geotextile seams include a 1-row and thread lock chain seam method.

Check whether the base layer is smooth and solid, and if there is a foreign object, it should not be properly handled. X0D X0A test laying: according to the site situation, determine the size of the geotextile, and test the laying after cutting, and the cutting size should be accurate.

Under normal circumstances, there can be no horizontal connection on the slope (the connection must not intersect it along the contour of the slope), except where it is repaired. X0D X0A In the case of suture, the suture must be of the same or greater material than the geotextile material, and the suture must be a material resistant to chemical ultraviolet rays. There should be a significant color difference between the suture and the geotextile for easy inspection.

X0D X0A At the bottom of the landfill, if the length of the crack exceeds 10% of the width of the membrane, the damaged part must be cut off and the two parts of geotextile are connected.

Geotextile construction is relatively simple.

Use manual rolling: the cloth surface should be flat, and the deformation margin should be appropriately left.

The installation of filament or filament geotextiles is usually done by lapping, stitching and welding. The width of stitching and welding is generally above, and the width of lap is generally above. Geotextiles that may be exposed for a long time. It should be welded or sutured.

All sutures must be done consecutively (e.g., spot seams are not allowed). Before overlapping, the geotextiles must overlap at least 150mm. The minimum stitch distance from the knitting edge (exposed edge of the material) is at least 25 mm.

The sewn homespun seams include a maximum of 1 row and a chain seam with a thread lock. The thread used for suturing should be a resin material with a minimum tension of more than 60N. And it has the ability to resist chemical corrosion and ultraviolet rays on par with or exceed geotextiles.

Any "missing stitches" on the sewn geotextile must be re-stitched where they are affected.

Appropriate measures must be taken to avoid soil, particulate matter or foreign substances entering the geotextile layer after installation.

Geotextile is a material used for soil reinforcement and prevention of soil erosion, and its construction process needs to pay attention to the following points:

1.Laying of geotextiles: Before construction, the surface of the land needs to be cleaned to remove obstacles such as weeds and stones. Then lay the geotextile on the area that needs to be reinforced or prevent erosion, taking care to lay the geotextile flat without wrinkles or voids.

2.Fixing of geotextiles: After laying the geotextiles, they need to be fixed to the ground to prevent them from being blown away by the wind or washed away by water. Nails or heavy objects can be used to secure the geotextile to the ground to ensure that it is firm and reliable.

3.Seams of geotextiles: If you need to splice multiple geotextiles together, you need to use a special seam strap to connect them.

The geotextiles need to be overlapped to a certain length at the seams and fastened together with seam straps to ensure that there are no water leaks or breakages at the seams.

4.Covering of geotextiles: After laying the geotextiles, they need to be covered with a layer of soil or stones to increase their stability and prevent them from being exposed to the sun.

The thickness of the overlay should be determined on a case-by-case basis, generally speaking, the thickness of the overlay of geotextiles should be between 10-20 cm.

In short, the construction of geotextiles requires attention to detail to ensure that they can achieve the desired results. During the construction process, adjustments and improvements need to be made according to the specific situation to ensure that the geotextile can maintain its stability and prevent erosion in long-term use.

Geotextile is a member of the geosynthetic material family, which is widely used in highways, railways, water conservancy, large-scale buildings, power plant ash dam construction, non-ferrous metal tailings treatment, environmental protection engineering, soil and water conservation, etc. At present, there are hundreds of enterprises with composite geotextile production capacity in China, with a total production capacity of more than 100,000 tons. With China's emphasis on the development of basic industries and the promotion and application of geosynthetics, the development of geosynthetics will accelerate in the future.

According to **, the use of geotextiles in China in 2010 may reach 100,000 tons. Raw materials for geotextiles The raw materials used in geotextiles should not only consider the physical and chemical properties required in the use environment, but also pay attention to the cost of products. In terms of performance, the following aspects are mainly considered:

Good physical and mechanical properties Geotextile has a harsh working environment, and in many cases it is soaked in water or spread in soil with high humidity, so it must have good hydrolysis resistance and wet mechanical properties. Ultraviolet radiation resistance, hydrolysis resistance, high and low temperature resistance Geotextiles should be exposed to sunlight, so they should have corresponding ultraviolet resistance; Composite geotextiles should adapt to the temperature when in contact with asphalt and other materials, requiring a high melting point. Chemical-resistant, corrosion-resistant, mildew-resistant Water and soil are very different, some are alkaline, some are acidic, some contain more salt, and some contain various elements, so they must be chemically stable.

Good permeability Geotextile filtration and drainage both need to be permeable, so it must have good permeability. 2. Plastic composite woven geotextile 1. It is made of woven cloth as the base material, by extruding coated polyolefin resin film or polyolefin resin as the sandwich layer, and bonding the woven cloth and various types of fabrics together. 2. The packaging bag made of this product has the advantages of light weight, acid and alkali resistance, high strength, moisture-proof and waterproof.

3. It is widely used in the packaging of chemical fertilizers, synthetic resins, coarse salts, mineral sands and cement and other products, and is a good packaging material for heavy packaging.

This question should be consulted with manufacturers specializing in the production of geotextiles, it just so happens that our company is, our company has a number of geotextile production equipment, strong technology, good products, Texas Zhongrui geotechnical materials engineering **** Zhang Mingchao for you to answer.