Products Description
Tunnel segment bolts are special fasteners used to fasten or connect segments during the construction of shield tunneling machines. Several arched segments are connected by segment bolts to form a circle, and the entire tunnel surface is supported by this circle, so it is also called segment connector. Because it is specially used for shield tunnels, it is also called shield segment bolts or tunnel bolts.
Tunnel Segment Bolt Types
Technical Parameters Of Railway Segment Bolts
| Parameter Category | Detailed Description |
| Execution Standard | GB/T 5780 (general), TB/T 2347 (railway industry), ISO 7412 (international standard) |
| Torque Value Reference | For Grade 8.8 bolts: For M24 specification, the recommended torque is 350 – 450N·m (to be used with washers) |
| Corrosion Resistance Grade | C4/C5 (Dacromet), ISO 9227 salt – spray test certification (meeting the requirements of humid/sub – water environments) |
| Application Environment | Tunnels, subways, underwater projects (acid – and – alkali – resistant, resistant to groundwater corrosion) |
Railway Segment Bolt Surface treatment：
Gnee Factory - Railroad Track Bolts Photos
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