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Polyamide sockets are widely used in tunnel applications, primarily within railway track fastening systems and for connecting precast concrete segments. They offer key advantages over traditional materials due to properties such as high mechanical strength, corrosion resistance, and suitability for harsh underground environments.
Applications
Applications
Railway and Metro Track Fastening: Polyamide sockets (also known as rail plastic dowels or sleeves) are embedded into concrete sleepers or slab track to provide a secure, insulated, and durable anchor point for rail clips, guide plates, and screw spikes.
Tunnel Segment Connections: Specific polyamide sockets and dowel systems are used to connect precast concrete tunnel segments during the ring-build process, ensuring correct alignment, excellent compression of gaskets, and resistance to significant pull-out and shear forces.
Key Properties & Advantages
Key Properties & Advantages
High Mechanical Strength: Polyamides, especially those reinforced with glass fibers, provide sufficient strength and stiffness to withstand the high dynamic forces and loads experienced in tunnel and railway environments.
Corrosion Resistance: Unlike metallic components, polyamide is highly resistant to water, chemicals, oils, and other caustic materials often present in tunnels, which extends the product's lifespan and reduces maintenance needs.
Electrical Insulation: Polyamide provides good electrical resistance, which is essential for modern railway systems that use track circuits for signaling and safety.
Vibration and Noise Dampening: The inherent elasticity of polymeric materials helps to buffer vibrations and reduce noise generated by train movements, contributing to a quieter tunnel environment.
Lightweight: Polyamide is significantly lighter than steel, making the components easier and more cost-effective to transport and install, especially in confined tunnel working spaces.
Durability and Long Life: Polyamide products show excellent resistance to aging, wear, and extreme temperatures, from as low as -50°C to well over +100°C, ensuring long-term reliability.
Fire Resistance: Flame-retardant grades of polyamide are available, meeting stringent fire safety standards required for rail and tunnel applications.
In summary, polyamide sockets provide a modern, durable, and effective solution for critical fastening and connection needs within the demanding conditions of tunnel applications, outperforming many traditional materials in specific areas like corrosion resistance and weight.
Kunshan Signum Machinery Technology Co.,Ltd offers polyamide sockets for tunnel segments according to clients’ requirements or drawings with competitive price.
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Email: admin@rail-fastening.com
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Address: 120 Tongjing Road, Lujia Town, Kunshan, Jiangsu 215331, China
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