Cable systems
Cables offer an optimal solution for reducing the weight of bridges while enhancing their span, leading to material savings and a reduced environmental footprint. Additionally, their use contributes to shorter construction timelines.
Parallel wire stay cable bridge
OVM Parallel wire system
The OVM Parallel Wire Stay Cable System is engineered for high-performance applications, including cable-stayed bridges, towers, and other long-span structures. This system utilizes multiple strands of high-strength steel wires, arranged in parallel to provide enhanced load distribution and superior stability. The parallel arrangement minimizes stress concentration, providing superior fatigue resistance even under dynamic loads and harsh environmental conditions.
Key features
- Being prefabricated on production line in factory
- Being packed in reel to transport
- Integral tension; tensile tonnage accurate; cable force uniform; cable adjustment convenience and accurately tested by sensor.
- Extension products are complete with external damper and load cell can be applied to the system for special requirements.
OVM Parallel wire structure Overview
The Parallel wire structure is a critical component of cable-stayed bridges and other infrastructure, designed to support and maintain the stability of the structure under various loads. Stay cables are made of high-strength steel wires, which are often coated with protective materials to ensure durability in harsh environmental conditions. The cables themselves are surrounded by a protective sheath, and the anchorage system plays a significant role in securing them to the bridge structure.
1. Parallel wire structure sheath types
Double-layer PE sheath
PE and double helix
Sectional view
2. Parallel steel wire types
Galvanized steel wires
Galvanized steel wires are made parallel together into a bundle by cable production equipment. Then twist concentrically 2~ 4°to the right. Wrapping up the cable by high strength polyester and then hot extruded with HDPE sheath. Finally, cut and mark the cable according to confirmed unstressed length of cable (usually under 20℃).
Epoxy-Coated Steel Wire
Epoxy coated steel wire adopts electrostatic spraying technology; spraying special epoxy powder on the surface of the wire to create a protective coating with good anti-corrosion property.
3. Parallel wire anchorage structures
a. Anchorage structure for arch bridge hangers
Design Suggestions for arch bridge hangers:
- Safety Factor: The safety factor for the hanger design should range between n = 2.5 to 3.
- Free Length: The shortest free length of the hanger should be no less than 2 meters.
- Waterproofing: The lower embedded pipe should extend 100mm to 150mm beyond the deck structure to ensure effective waterproofing.
Types of Anchorage for Arch Bridge Hangers
Type Ⅰ Anchorage with Nut
Used for both arch end and deck end beam
Type II Dead-End Anchorage with Fork
Used for arch end and beam end
Type III Adjustable Anchorage with Fork
Primarily used for deck end
b. Anchorage structure for cable-stayed bridges
The anchorage with nut is usually used in for both ends of the parallel wire stay cable applied to of cable-stayed bridge.
Types of Anchorage for cable-stayed bridges
Structure of Chill-Casting Anchorage with Nut
This type of anchorage involves a robust chill-casting technique for creating the anchorage nut, ensuring that the system can withstand high tension and heavy loads while maintaining a secure connection.
Structure of chill-cast anchorage with fork
This type of anchorage involves a robust chill-casting technique for creating the anchorage nut, ensuring that the system can withstand high tension and heavy loads while maintaining a secure connection
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