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Fish Plate Rail Joint
Fish Plate Definition and Uses A fish plate (or splice bar) is a metal connector used to join two rail ends together in railway tracks. These critical components: Maintain continuous rail alignment Transfer load between rail sections Allow for thermal expansion/contraction Provide electrical...
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A fish plate (or splice bar) is a metal connector used to join two rail ends together in railway tracks. These critical components:
- Maintain continuous rail alignment
- Transfer load between rail sections
- Allow for thermal expansion/contraction
- Provide electrical continuity in electrified tracks
01
High Quality
02
Advanced Equipment
03
Professional Team
04
Custom Service
Types of Fish Plates
| Type | Rail Size | Material | Key Feature |
|---|---|---|---|
| Standard | 30-50kg/m | Mild steel | General purpose |
| Compromise | Mixed sizes | Alloy steel | Connects different rail profiles |
| Insulated | All sizes | Composite | For signaling sections |
| Heavy Duty | 60-75kg/m | High-carbon steel | High-speed lines |
| Special | Curved tracks | Manganese steel | For tight curves |
Fish Plate in Railway Applications
Mainline tracks
Switches & crossings
Bridge approaches
Railway depots
Temporary repairs
Fish Plate Rail Joint Installation Process
Clean rail ends (remove rust/debris)
Check rail end condition (no chips/cracks)
Apply anti-seize compound
Maintain 3-6mm expansion gap (varies by climate)
Ensure perfect vertical/horizontal alignment
Position fish plates symmetrically
Install 4 or 6 high-tensile bolts (typically M24)
Torque to 300-400 Nm (follow manufacturer specs)
Use spring washers for vibration resistance
Verify joint bar seating
Check bolt tension
Confirm electrical continuity (if required)
Technical Specifications
| Parameter | Requirement |
|---|---|
| Tensile Strength | Minimum 600 MPa |
| Hardness | 200-300 BHN |
| Corrosion Resistance | Zinc plating or painting |
| Service Life | 10-15 years |
Why Proper Fish Plate Installation Matters
Prevents rail buckling in hot weather
Reduces impact loads on rolling stock
Maintains signal circuit integrity
Extends rail lifespan by 20-30%
Common Fish Plate Issues & Solutions
Q: Problem: Loose bolts
A: Solution: Retorque with calibrated wrench
Q: Problem: Cracked plates
A: Solution: Immediate replacement
Q: Problem: Excessive wear
A: Solution: Upgrade to heavier section
Q: Problem: Electrical discontinuity
A: Solution: Install bonded jumpers
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