Description
Technical Parameters
Railway Track Clamps & Fasteners Specification
| Clamp Name / Type | Primary Function & Application | Key Features & Description |
|---|---|---|
| Rail Clips (Elastic Fasteners) | To clamp the rail foot to the sleeper, providing longitudinal and lateral restraint while allowing for thermal expansion. | Most common type of "clamp." Made from spring steel. Provides a constant holding force, dampens vibrations, and is highly durable. |
| Fishplate Clamps (Bolt Hole Clamps) | To temporarily clamp two rails together at the joint during welding, thermit welding, or for emergency repairs. | Used for alignment. They hold the rail ends level and tight to ensure a perfect weld or secure joint before permanent fastening. |
| Guard Rail Clamps | To fasten guard rails (check rails) to the sleepers in tight curves, crossings, or bridges. | Often a heavier-duty version of a standard rail clip or a specific design to accommodate the extra rail. Ensures correct gauge between running rail and guard rail. |
| Check Rail Clamps | Similar to guard rail clamps, used to secure check rails in switches and crossings (S&C). | Designed to fit the specific sleeper and rail profile used in complex trackwork like frogs and crossings. |
Key Concepts:
- Elastic Fastening System: This is the modern standard. Clips like the Pandrol clip or Nabla clip are pre-tensioned to act like a spring, maintaining constant pressure on the rail foot. This system absorbs energy, reduces vibration, and handles dynamic loads far better than rigid fastenings.
- Application-Specific: The correct clamp is chosen based on:
- Sleeper Type: Concrete, wood, or steel.
- Rail Profile: The size and shape of the rail foot (e.g., UIC 60, AREMA 115RE, BS 113A).
- Location: Mainline, curves, switches, bridges, or tunnels.
- Requirements: Electrical insulation, level of restraint, or maintenance needs.
- Standards: All clamps are manufactured to strict international (e.g., EN standards European Norm) or national (e.g., AREMA American Railway Engineering and Maintenance-of-Way Association) standards to ensure safety and performance.
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