The DT railway fastening system is a widely used separated two-stage elastic fastening solution specifically designed for urban rail transit applications, playing a critical role in maintaining track stability and providing vibration/noise reduction.
The system features comprehensive and well-defined structural components. Taking the typical DTIII type as an example, it consists of Type I spring clips, T-bolts, gauge blocks, baseplates, rail pads, plate pads, and sleeve bolts. The spring clips, as core fastening components, utilize standardized Type I railway clips that secure rails through bolted connections. The polygonal gauge blocks enable precise gauge adjustment - quadrilateral blocks provide 6mm adjustment range while hexagonal blocks offer 10mm. The dual-layer elastic pad system (rail pad + plate pad) forms the key two-stage elastic mechanism that effectively absorbs vibration energy.
Performance-wise, the DT system demonstrates outstanding vibration reduction capabilities with approximately 21kN/mm vertical static stiffness, reducing acceleration transfer function values by 5-10dB compared to conventional fasteners, significantly minimizing train-induced environmental vibrations. It also provides flexible adjustment capacity - vertical adjustment up to 15mm through pad stacking meets track geometry correction requirements during both construction and operation. Furthermore, all components employ optimized materials: corrosion-resistant treatments for metal parts and insulated components ensuring proper track circuit performance, making it suitable for metro's humid and dusty operating environments.
The system primarily serves urban metro and light rail lines, such as DTIII types in Shanghai Metro Line 1's general vibration reduction sections and DTI types in certain Beijing Metro lines. Its design specifically accommodates metro operational characteristics including frequent starts/stops and heavy passenger loads, withstanding repeated impact loads while maintaining long-term track stability.
As a mature fastening solution, the DT series adopts modular design for standardized production and installation. Maintenance proves convenient as component replacement requires no major track disassembly, ensuring controllable lifecycle costs and establishing it as an essential element of urban rail transit track systems.
GNEE RAIL is a professional trading company focusing on the export of railway fasteners, committed to providing reliable rail connection products for global railway construction projects. The main products include a full range of railway fasteners such as various spring clip fastener systems, sleeper bolts, anti-loosening washers and insulating components, which are suitable for various application scenarios such as conventional railways, heavy-duty railways and urban rail transit.