Medium Vibration Damping Fasteners

APPLICATION SCENARIOS

1. At the connections between railway sleepers and rails, buffering vibrations from train operation  

2. In urban rail transit lines, reducing track noise and structural fatigue  

3. In elastic track systems of high-speed railways, enhancing riding comfort  

4. During track maintenance and replacement, ensuring the elasticity and stability of fasteners

Product Description

This fastener adopts a nonlinear vibration damping structure consisting of a single-layer backing plate + double-layer rubber pads, achieving a moderate vibration damping effect of 6-8dB, while compressing the overall structural height to a minimum of 37mm. It can directly replace ordinary fasteners on existing lines without modifying the track foundation, significantly reducing the cost and construction period of track upgrading.

PRODUCT FUNCTION

Efficient vibration suppression:  

Double-layer nonlinear rubber layers (thermoplastic rubber + natural rubber composite) achieve synergistic energy dissipation, reducing vibration transmission of sleepers by 6-8dB.  

Ultra-thin engineering adaptation:  

With an ultimate structural height of 37mm, it is compatible with various fastener systems of existing lines.  

Non-destructive replacement and upgrading:  

Bolt positioning holes fully match existing fasteners, enabling vibration damping improvement with zero foundation modification.  

Triple safety guarantees:  

Pre-compression technology for rubber layers ensures controllable long-term creep; metal backing plates provide rigid support; anti-eccentric load capacity is increased by 30%.

PERFORMANCE INDEX

Vibration damping level: Medium vibration damping (insertion loss 6-8dB)  

Structural height: 37mm~42mm (compatible with conventional fastener space)  

Core structure: Single-layer steel plate backing + double-layer thermoplastic/natural rubber composite damping layer  

Service life: 25 years (trackside environment, -40℃~80℃ working conditions)  

Dynamic characteristics: Dynamic-static stiffness ratio ≤1.4, deformation ＜5% after 3 million fatigue cycles  

Environmental certification: Compliant with EN 14080 fire safety standards, passed RoHS/REACH

APPLICATION AREA

Metro renovation projects: Vibration damping upgrading of existing tunnel lines (directly replacing original fasteners)  

Urban light rail systems: Load reduction and noise control for elevated section bridges  

Heavy-haul railways: Vibration energy dispersion of tracks in freight hubs  

Station throat areas: Protection of vibration-sensitive equipment in switch areas  

Track vibration damping transition sections: Buffer zones connecting ordinary ballast beds and vibration damping ballast beds

Cost-Efficient Double Non-Vibration Dampening Fasteners for Existing Railway Lines

The medium vibration dampening fasteners, often referred to as double non-vibration dampening fasteners, represent a highly cost-efficient solution for upgrading existing railway lines without the significant expense and disruption of major civil engineering work. The design is centered around providing effective vibration reduction while achieving full compatibility with current track infrastructure.

The key to the cost efficiency is the non-destructive replacement and upgrading function. These fasteners are engineered with bolt positioning holes fully matching existing fasteners. This meticulous compatibility means they can directly replace ordinary fasteners on existing lines without modifying the track foundation. Traditional vibration mitigation often requires rebuilding the track bed or installing expensive floating slab systems, incurring massive costs and protracted construction periods. By eliminating the need for any foundation modification, the double non-vibration dampening fasteners significantly reducing the cost and construction period of track upgrading.

This is further enabled by the ultra-thin engineering adaptation. The fastener achieves an ultra-low structural height down to a minimum of $37\text{mm}$, ensuring it is compatible with various fastener systems of existing lines. This low profile is essential for metro renovation projects and urban light rail systems where structural height clearances, particularly in tunnels and on elevated bridges, are extremely restricted. The ability to fit into conventional fastener space immediately expands the range of feasible upgrade projects.

The moderate, yet effective, medium vibration dampening fasteners level of vibration suppression means they deliver tangible improvements in reducing vibration transmission of sleepers without the over-engineering required for some specialized track sections. The double-layer nonlinear vibration damping fastener structure, combining thermoplastic rubber and natural rubber, utilizes synergistic energy dissipation to achieve a reliable damping effect. This optimized balance of performance and compatibility results in a highly effective, low-cost solution for improving the operational life and environmental impact of existing rail corridors.

Medium vibration dampening fasteners for Tunnel Renovation and Non-Destructive Track Upgrading

Medium vibration dampening fasteners are uniquely suited for tunnel renovation and non-destructive track upgrading projects, particularly within constrained urban rail transit lines. These environments demand vibration mitigation to reduce noise pollution and structural fatigue, but the logistical and structural limits of tunnels prohibit invasive construction.

The critical enabling feature is the ultra-thin engineering adaptation achieved by the fastener’s low profile. With an ultimate structural height of $37\text{mm}$, this double non-vibration dampening fasteners solution is specifically designed to overcome the severe spatial constraints inherent in existing tunnels and elevated structures. This height compatibility is necessary because raising the rail level in a tunnel is often impossible due to fixed constraints like overhead catenary systems and structural clearances. The low height ensures the medium vibration dampening fasteners can be inserted directly into the existing track geometry.

The method of non-destructive replacement and upgrading is central to tunnel work efficiency. The fasteners are designed with bolt positioning holes fully matching existing fasteners, which means they can be installed with zero foundation modification. This capability allows metro operators to execute vibration damping upgrading of existing tunnel lines by directly replacing original fasteners during routine maintenance windows, dramatically minimizing traffic disruption and eliminating the huge costs and time associated with excavation or concrete work within the tunnel bore.

Functionally, the double-layer nonlinear rubber layers provide an efficient vibration suppression effect.1 While achieving a moderate damping level, this is sufficient to significantly reducing track noise and structural fatigue within the acoustically sensitive tunnel environment. Furthermore, the triple safety guarantees—including pre-compression technology to ensure controllable long-term creep and metal backing plates for rigid support—ensure the system’s longevity and safety in the demanding, inaccessible conditions of a tunnel, delivering a reliable vibration damping improvement with minimal operational impact.

Double Non-Vibration Dampening Fasteners Enhancing Comfort and Safety on High-Speed Railways

The application of double non-vibration dampening fasteners on high-speed railways significantly enhances both riding comfort and safety by managing the intense dynamic forces generated by high-speed rolling stock. These fasteners are utilized within the elastic track systems to maintain stability and mitigate cyclical stress.

For riding comfort, the fasteners play a direct role in buffering vibrations from train operation at the most critical interface: the connection between the rail and the sleeper. The double-layer nonlinear vibration damping fastener structure utilizes its composite rubber pads to absorb and dissipate dynamic energy, effectively reducing the transmission of vibrations into the track structure. In elastic track systems of high-speed railways, this damping action is essential for smoothing out the ride experience, mitigating the high-frequency vibrations that can lead to passenger discomfort over long distances.2

In terms of safety, the fasteners provide several layers of protection. Firstly, they reduce structural fatigue on the track components. High-speed traffic subjects the rail fasteners to millions of intense stress cycles. By utilizing their synergistic energy dissipation properties, the fasteners minimize the peak forces transmitted through the sleeper, thereby extending the operational lifespan and reliability of the track structure itself. Secondly, the fasteners are designed with triple safety guarantees, which includes anti-eccentric load capacity that is significantly increased. This feature enhances the stability and structural integrity of the track, reducing the risk of rail movement or loosening under the extreme lateral and vertical forces encountered on high-speed curves and at high speeds.

Finally, the resilience of the component ensures long-term safety assurance. The fasteners maintain the elasticity and stability of fasteners during the track maintenance and replacement cycles. With a designed service life of over two decades, the material performance remains stable against environmental factors, ensuring that the medium vibration dampening fasteners continue to deliver essential vibration control and support the structural stability required for safe, high-speed rail operation in critical zones such as station throat areas and track transition sections.