Embedded Files
The Nabla C1 spring clip is a high-performance elastic rail fastening component designed to secure I-section rails to concrete sleepers. It is a critical part of the Nabla C1 Fastening System, which is widely used in high-speed rail, heavy-haul freight, and urban transit systems.
Technical Specifications
Technical Specifications
The Nabla C1 clip is engineered for high durability and stability under extreme dynamic loads:
Material: Fabricated from hot-rolled alloy spring steel, typically 60Si2Mn or 60Si2CrA.
Hardness: Rated between 41 and 47 HRC.
Fatigue Life: Tested for up to 200 million load cycles without failure, ensuring long-term reliability.
Performance Standard: Fully compliant with EN 13481-2 (Category C) for concrete sleeper fastening systems.
Axle Load Capacity: Supports heavy-haul operations with an axle load capacity of up to 26 tons.
Key Features & Functions
Key Features & Functions
Clamping Force: Generates a dynamically stable "toe load" on the rail foot when the fastening nut is torqued, typically using a screw spike tightened to 250–400 Nm.
Vibration Damping: Effectively absorbs and disperses vibrations and shock forces, reducing noise and preventing track loosening.
Thermal Flexibility: Secures the rail firmly while allowing for limited flexibility required by thermal expansion and contraction.
Corrosion Resistance: Surface treatments (such as salt spray testing per EN ISO 9227) allow for performance in coastal or desert environments.
System Components for Installation
System Components for Installation
A standard installation per sleeper (four clips total) usually includes:
4 Nabla C1 Clips: The primary elastic blade elements.
4 Screw Spikes: Typically Tr 22x160 (Grade 4.6 or 4.8), often pre-lubricated to ensure uniform pressure.
4 Insulators/Gauge Baffles: Made of reinforced nylon (PA66+30%GF) for electrical insulation and track gauge maintenance.
2 Rail Pads: Resilient rubber pads (Shore A hardness ≥65) that act as a cushion between the rail and sleeper.
4 Nylon Dowels: High-tensile inserts (subjected to 60 kN tensile tests) for securing spikes into the concrete.
Report abuse