Cable-stayed Structures
Stay cables in bridge engineering
Stay cables are essential to the structural integrity, durability, and aesthetics of modern bridges. VSL’s stay cable systems are engineered for high performance in both new and existing bridge structures. Whether for cable-stayed or extradosed bridges, our solutions combine proven technology, durability, and constructability, backed by decades of experience.
The role of stay cables in bridge construction
Stay cables transfer deck loads efficiently to pylons, allowing for long spans with reduced substructure requirements. They are vital for cable-stayed and extradosed bridge configurations where structural lightness, aesthetics, and deck clearance are key.
Modern stay cable systems incorporate advanced corrosion protection, vibration control, and health monitoring. These features increase service life and safety, especially in harsh environments.
Strand-by-strand installation, modular components, and easy cable replacement contribute to reduced construction cycles, safer execution, and optimized lifecycle maintenance.
VSL's end-to-solutions for your cable-stayed structures
Stay cables are subjected to high tensile forces and stress variations – making them a very complex assemblage. The VSL stay cable system is the result of 40 years of constant R&D and meticulous rounds of improvements on the components.
Design and engineering
Supply of SSI 2000 and SSI 2000D Systems
Installation and supervision
Maintenance and monitoring
Our service options for stay cable systems
Fire protection
VSL delivers fire protection services for stay cables on critical infrastructure such as bridges and towers. Designed to preserve cable functionality and aesthetics, these solutions provide high fire resistance without disrupting operations. Systems are quick to install, weather-resistant and lightweight, while maintaining full access for inspection, maintenance or replacement. Fully tested and certified to international fire and stay cable standards, they enhance resilience, safety and long-term asset protection.
Ice protection & ice management
VSL provides passive ice protection services to secure cable-stayed bridges in cold and variable climates. Using a specially designed HDPE stay pipe with an engineered rib profile, ice is fragmented and retained on the surface until melting, preventing hazardous ice falls. This solution improves aerodynamic stability, requires no operating energy, and can be combined with active de-icing when needed—helping owners keep bridges open, safe and operational year-round.
Robotic stay cable inspection
VSL’s robotic inspection services enable fast, safe and comprehensive assessment of stay cables without traffic disruption or risky access methods. Self-propelled robots capture 100% of the cable surface, while machine-learning tools support automated damage detection. Delivered as a service, this solution provides accurate, real-time data to anticipate maintenance needs, reduce inspection time, enhance worker safety and support informed, proactive asset management decisions.
Robotic stay cable cleaning
To maintain aerodynamic performance and visual quality, VSL offers robotic cleaning services for stay cables, especially suited to landmark bridges. Automated systems remove dirt and deposits efficiently while keeping traffic flowing and avoiding manual access. This service helps preserve cable behavior, reduce wind-induced vibration risks and maintain the architectural appearance of high-profile structures—supporting long-term performance with minimal operational constraints.
Vibratrack® permanent monitoring
VSL’s Vibratrack® is a permanent monitoring service for stay cables, combining embedded sensors, data acquisition and advanced software. Installed inside the stay pipe, the system continuously measures cable behavior and calculates key parameters such as tension force, displacement and stiffness. Easy to install without traffic interruption, Vibratrack® enables predictive maintenance, reduces inspection costs, preserves bridge aesthetics and supports safe, long-term operation.
Why choose VSL for your cable-stayed bridge projects?
Proven cable technology
VSL’s SSI 2000 system has been used in hundreds of cable-stayed bridges globally, offering superior fatigue resistance and long-term durability.Expertise in complex projects
From high pylons in urban areas to marine and seismic conditions, VSL adapts its systems and methods to meet project-specific challenges.End-to-end services
VSL offers integrated services from design to commissioning, including cable supply, installation, form travelers, and monitoring systems.
FAQ about Stay-cabled structures in Bridge Construction
It is VSL’s proprietary cable-stayed system optimized for fatigue resistance, modular installation, and superior corrosion protection. It includes options for saddles, friction dampers, and anti-vandalism measures.
VSL uses individually sheathed, waxed, and galvanized strands, sometimes with internal dehumidification (SSI 2000D) for continuous protection and monitoring.
Yes. VSL systems are designed for easy access and individual strand replacement, and our teams provide maintenance and refurbishment services globally.