Description
Technical Parameters
Railway Screw Spikes
| Feature | Description |
|---|---|
| Primary Function | To provide a high-strength, vibration-resistant connection between the rail/baseplate and the sleeper (wood or concrete). |
| Key Characteristic | A coarse-threaded shaft that screws into the sleeper, offering excellent pull-out resistance and maintaining clamping force. |
| Common Standards | AREMA, EN 13481, various international and proprietary railway standards. |
| Typical Materials | Medium Carbon Steel, High Carbon Steel, Alloy Steel. |
Installation & Functional Advantages Table
The installation process and mechanical principles of screw spikes are key to their performance.
| Aspect | Description |
|---|---|
| Mechanical Principle | The threads engage a large volume of material, converting rotational force (torque) into a powerful clamping force. The grip relies on the shear strength of the engaged threads, not just friction. |
| Installation Process (Wood) | 1. A lead hole is drilled into the sleeper. 2. The screw spike is driven with a high-torque impact wrench to a specified torque value. 3. Correct torque ensures optimal clamping force without damaging the thread or the wood. |
| Installation Process (Concrete) | 1. A sleeper with a pre-embedded insert is used. 2. The screw spike is driven into the insert, which deforms to grip the threads tightly. |
| Vibration Resistance | The threaded connection is highly resistant to the vibrational forces that can loosen dog spikes. The clamping force remains more consistent over time. |
| Pull-Out Resistance | Significantly higher than that of a dog spike. The force required to pull a screw spike out is many times greater due to the mechanical interlocking of the threads. |
Comparison with Dog Spikes
| Parameter | Dog Spike | Screw Spike |
|---|---|---|
| Holding Power | Moderate. Relies on the crushing of wood fibers. Can loosen over time. | Very High. Relies on mechanical interlocking of threads. Maintains clamp load. |
| Installation Speed | Very Fast. Driven with a few hammer blows. | Slower. Requires drilling (for wood) and a slower screwing-in process. |
| Cost | Low. Cheaper to manufacture. | Higher. More material, complex manufacturing, and higher installation cost. |
| Re-usability | Poor. Once pulled, the hole is often enlarged, requiring a new location or a plug. | Good. Can often be unscrewed and re-tightened in the same hole without significant strength loss. |
| Primary Application | Standard track on wood sleepers with low to moderate traffic. | Critical sections (curves, bridges), heavy-haul lines, and concrete sleeper applications. |
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