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Common Metro Fastening Systems for Urban Rail Transit - DT Series
The DT Series fastening system is specifically designed for underground lines in urban rail transit, featuring multiple models such as DTIII, DTIV, DTVI, and DTVII. Each model may include improved versions, for instance, DTVI-2 represents an enhanced variant of the DTVI fastening system.
The DT Series fastening system, engineered specifically for underground urban rail transit lines, delivers significant advantages including high clamping force, superior elasticity, and broad applicability. While design variations exist among models and enhanced versions, all configurations prioritize track stability and operational safety as core objectives. In practical implementation, model selection must align with site-specific track parameters through comprehensive technical evaluation.
I. Main Models of DT Series Fastening Systems
Base Models: DTIII, DTIV, DTVI, and DTVII. These are fundamental models of the DT series, each engineered for specific urban rail transit requirements.
Enhanced Models: Including but not limited to DTIII-2, DTIV1, DTVI1, DTVI2, DTVI3, DTVII2.
II. Model Specifications
DTIII & DTVI Fasteners: Specifically configured for 60 kg/m rails (heavy-duty main lines)
DTIV Fasteners: Compatible with 50 kg/m rails (standard urban lines)
DTIII-2 Fasteners
Designed for 60 kg/m rails in tunnels with standard vibration attenuation requirements.
Applicable to monolithic concrete trackbeds with discrete sleeper support, featuring a shoulderless elastically detached fastening mechanism.
DTVI2 Fasteners
Suitable for 60 kg/m rails in tunnels, U-shaped cut-and-cover structures, and underground station trackbeds with short sleeper configuration.
Characterized as shoulderless elastic fasteners.
III. Performance Characteristics of DT Series Fastening Systems
- High Clamping Force & Superior Elasticity
Engineered for heavy-haul/high-frequency operations, the DT series delivers exceptional track stability and safety through optimized clamping force and elastic retention.
- Shoulderless Design
Eliminating concrete shoulders prevents lateral rail displacement under transverse loads (per EN 13481-5 Sec.4.2.3), enhancing track geometric integrity.
- Broad Environmental Adaptability
Proven performance in diverse underground environments within monolithic trackbed configurations (tunnels/cut-and-cover/station zones).
- Vibration & Noise Mitigation
While marginally less effective than specialized damping systems (e.g., floating slab), meets ISO 14837-1 Category B requirements for urban transit.
- Structural Resilience
Robust impact resistance (≥15 kJ dynamic load per UIC 774-3) withstands operational stresses including wheel-rail impacts and harmonic vibrations.
- Maintenance Efficiency
Modular design enables rapid installation (<15 min/sleeper) and component replacement, reducing LCC by ≈23% versus conventional systems.
GNEE RAIL is a global supplier focusing on the railway infrastructure field, committed to providing high-performance and high-reliability railway fastener systems to international customers. Our products cover various types of rail fasteners, spring clips, bolts, pads and supporting components, fully meeting the diverse needs of high-speed railways, heavy-haul railways, urban rail transit and conventional lines.
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