What are the applications of ordinary noise reducing comb plate expansion device in the rail transit
The ordinary noise reducing comb plate expansion device is a key supporting component for rail transit bridges and roadbeds. Its core function is to adapt to beam expansion and contraction, reduce wheel rail impact noise, ensure smooth driving and structural safety, and is widely used in subway, light rail, urban rapid transit, and railway bridge engineering.
The ordinary noise reducing comb plate expansion device is a key supporting component for rail transit bridges and roadbeds. Its core function is to adapt to beam expansion and contraction, reduce wheel rail impact noise, ensure smooth driving and structural safety, and is widely used in subway, light rail, urban rapid transit, and railway bridge engineering.
1、 Urban rail transit elevated bridge
Subway/Light Rail Elevated Section: Used for expansion joints at elevated beam ends, adapted to temperature deformation, concrete shrinkage and creep, and high-frequency vibration of trains. The conventional expansion amount is 80-240mm, with noise reduction of 10-20dB, reducing wheel rail impact noise, and protecting the surrounding environment.
Continuous beam/rigid frame bridge: adaptable to multi-directional displacement (horizontal, vertical, corner), solving the large displacement requirements of large-span beams, preventing beam end compression or tearing, and ensuring structural stability.
Station and section connection section: achieve smooth transition between bridge and platform structures, reduce bumps and noise when trains pass through, and improve passenger comfort.
2、 Railway and urban fast track bridges
General speed/intercity railway bridges: capable of withstanding heavy train loads and high-frequency impacts (≥ 1 million load cycles), high-strength steel (Q355/stainless steel) resistant to fatigue, adaptable to 80-1000mm expansion and contraction, ensuring long-term operational safety.
Urban high-speed rail elevated bridge: balancing high-speed and high-frequency operation, noise reduction design reduces interference to residential areas along the line, modular structure facilitates quick installation and maintenance.
Railway dedicated line/freight line bridges: bear heavy train loads, are sturdy and wear-resistant, resist erosion from sand, gravel, and debris, and extend their service life.
3、 Special structural nodes of rail transit
Bridge and tunnel interface: Adapt to the deformation differences of soft and hard structures, waterproof sealing (EPDM rubber waterstop), prevent rainwater from infiltrating the tunnel, and protect internal equipment.
Connection between switch area and expansion joint: Ensure continuous track alignment, reduce impact and noise when trains pass through switches, and improve smooth operation.
Basic connection of sound barrier: In conjunction with the installation of sound barriers, it reduces the transmission of structural vibrations, enhances noise reduction effects, and optimizes the sound environment along the line.
4、 Core application advantages adaptation
Noise reduction and vibration reduction: comb teeth staggered+elastic support (high damping rubber), reducing wheel rail impact and metal collision, noise ≤ 70dB, in line with urban environmental protection requirements.
High load-bearing durability: Made of high-strength steel with wear-resistant treatment, it is resistant to fatigue and impact, and suitable for heavy-duty and high-frequency working conditions in rail transit.
Multi directional displacement: adapts to the longitudinal and transverse expansion and contraction, vertical settlement, and rotation of the beam body, avoiding additional stress on the structure.
Waterproof and anti fouling: Sealed design+hydrophobic structure, preventing rainwater and debris from entering, reducing blockage, and lowering maintenance costs.
Easy installation and maintenance: modular bolt fixation, fast construction; Single tooth replaceable, no need for overall dismantling, suitable for rapid repair needs of rail transit.
5、 Summary of Typical Application Scenarios
Expansion joints at the ends of elevated beams for subway/light rail
Expansion device for intercity/urban rapid transit bridges
Large displacement expansion and contraction of railway continuous beams and rigid frame bridges
Bridge and tunnel, platform connection nodes
Urban rail transit sections with high requirements for noise control
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