The 1995 Osormort Viaduct, world’s first under-deck cable-stayed bridge with extradosed tendons, underwent critical rehabilitation following severe corrosion detection in 2023.
Technical Specifications
| Component | Original (1995) | Replacement (2024) |
|---|---|---|
| System Type | Under-deck cable-stayed | VSL XT-M PLUS 6-22 |
| Tendon Count | 26 extradosed | 26 new units |
| Design Feature | Continuous prestressed concrete | Enhanced maintenance access |
| Tensioning Method | Traditional | Strand-by-strand |
| Corrosion Protection | Standard | Advanced system |
Implementation Process
| Phase | Scope | Technical Detail |
|---|---|---|
| Temporary Support | Installation of temporary tendons | Load transfer system |
| Removal | De-stressing damaged elements | Controlled demolition |
| Installation | New extradosed system | VSL XT-M PLUS 6-22 |
| Bearing Replacement | Both abutments | Modern pot bearings |
| Monitoring | Real-time structural analysis | Continuous assessment |
Technical Achievement
Key elements include:
. Advanced tendon system
. Enhanced maintainability
. Improved corrosion protection
. Structural monitoring
. Safety implementation
. Heritage preservation
Engineering Innovation
The rehabilitation delivers:
. Strand-by-strand tensioning
. Easier inspection access
. Superior protection
. Extended service life
. Enhanced safety
. Modern monitoring capability
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