Post-tensioning system
OVM specializes in designing, manufacturing, and installing reliable post-tensioning systems. Our solutions adhere to international standards and are suitable for both new and existing structures
OVM External Prestressing Systems
OVM’s External Prestressing System is a high-performance solution used in bridges, buildings, and special engineering structures where tendons are positioned outside the concrete section rather than embedded within it. This system enhances structural durability, allows for easy inspection and maintenance, and provides high resistance against fatigue and corrosion.
Standards & Compliance
The OVM External Prestressing System conforms to several international and national standards, ensuring high quality, durability, and structural integrity:
1. fib Bulletin 33 – Durability of Post-Tensioning Tendons.
2. ASTRA 12 010
3. EAD 160004-0310 – Post-Tensioning Kits for Prestressing of Structures
4. fib Bulletin 75 – Polymer-Duct Systems for Internally Bonded Post-Tensioning
5. PTI M50.3-19 – Specification for Multistrand and Grouted Post-Tensioning
6. FDOT 2022 – Florida Department of Transportation (FDOT) Standard Specifications for Road and Bridge Construction
Key Advantages of OVM External Prestressing Systems
Durability & Corrosion Resistance
- Designed with high anti-corrosion properties to withstand harsh environmental conditions.
- Suitable for marine structures, long-span bridges, and infrastructure with high exposure to de-icing salts and moisture.
Fatigue Resistance & Longevity
- Engineered for excellent fatigue resistance, making it ideal for structures subject to repeated dynamic loads (e.g., bridges, highways).
Damping Device for Vibration Control
- A damping device can be installed to reduce tendon vibration, particularly in cable-supported structures and long-span bridges.
- Helps to mitigate wind-induced vibrations and traffic-induced oscillations.
Ease of Inspection & Maintenance
- Since the tendons are external, they can be easily inspected, monitored, and replaced if necessary.
- Reduces long-term maintenance costs compared to internally bonded tendons.
Replaceability & Structural Flexibility
- Tendons can be re-tensioned or replaced without major structural modifications.
- Allows for future strengthening or modification of the structure.
Stress Reduction at Deviators
- The system includes an individual strand deviator, which minimizes stress concentration in the tendon where it changes direction.
- Helps to increase the lifespan of the tendon and reduce material fatigue.
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