Freyssinet

At the forefront of the bridge construction industry

In 1989, Freyssinet invented the first individually protected multi-strand stay cable, the basis of Freyssinet’s technology for cabled structures. The technique has since been used and improved on more than 300 projects, including the Normandy bridge, the Iroise bridge and the Millau viaduct in France, the Vasco de Gama bridge in Lisbon, the Rion Antirion bridge in Greece, the roof of the BC Place stadium in Vancouver in 2011, and the Russky Island bridge in Vladivostok which, with 1,104-meter main span, still holds the world record.

Today, Freyssinet has developed an ecosystem of expertise in the construction and maintenance of cable-stayed bridges.

  • 320+
    Number of structures worldwide built with Freyssinet stay cables
  • 585m
    World record for the length of cable stays with Freyssinet technology (meters)
  • 2200
    Mpa - Highest strand grade used for the Freyssinet cable-stay system
  • 100y
    Design lifetime of the Freyssinet cable-stay system (years)

Invest in sustainable technology

Cables are the best solution for reducing the weight of bridges while increasing their span, thus saving materials and reducing environmental footprint. They also reduce construction times. These key benefits, along with continued improvements in the technology over the past few years, are why bridge owners are so keen to use them.

With the installation in 2021 of 2160 MPa stay cables on the Saemangeum bridge in South Korea, Freyssinet is showing that innovation is still part of its DNA.

The market benchmark in terms of fatigue resistance, corrosion protection, inspectability and replaceability.

Sustainable technology, constantly optimised in design and implementation to remain at the forefront of the market.

Continuous development of new products and methods to facilitate the integration of stay cables and to make projects successful, even in new configurations.

Our technology is fully qualified to the latest international standards and regularly tested as per:

  • fib Bulletin 89 “Acceptance of stay cable system using prestressing steel”, 2019
  • PTI DC45.1-18 “Recommendations for stay cable design, testing and installation”, 2018
  • CIP “Recommendation of French inter-ministerial commission on prestressing”, 2002

Development of effective solutions thanks to specialist teams networked around the world.

Stay cable systems designed and manufactured under complete control.

Pro-active assistance during the warranty and post-warranty periods, thanks to:

  • the strength of the Freyssinet network
  • technologies and tools enabling our partners to ensure performance monitoring and preventive maintenance, which are essential for the life of the products and the structure.
Cable systems

A full value chain expertise

Cable-stayed bridge

Cable-stayed bridge

  • Standard anchorage
  • Clevis anchorage
  • Multihole saddle
  • Built-in saddle

  • Monostrand
  • Compact Monostrand
  • Cohestrand
  • CFRP strand (Carbon Fibre Reinforced Polymer)

  • Internal Elastomeric Dampers for cables < 80m
  • Internal Hydraulic Dampers for cables 80 to 150m
  • Internal Radial Dampers for cables 150 to 300m
  • External Hydraulic Dampers for cables >300m
  • Cross ties

  • Fire protection
  • Lightning protection
  • Ice shedding control
  • Blast protection

  • Coloured HDPE duct
  • Smart LED solution
  • Integrated lighting module

Extradosed bridge

Extradosed bridge

  • Extradosed anchorage
  • Multihole saddle
  • Built-in saddle

  • Monostrand
  • Cohestrand
  • Locally Cohesive Strand (LCS)

  • Internal elastomeric dampers

  • Fire protection
  • Lightning protection
  • Ice shedding control
  • Blast protection

  • Coloured HDPE duct
  • Smart LED solution
  • Integrated lighting module

Arch bridge

Arch bridge

  • Standard anchorage
  • Clevis anchorage

  • Monostrand
  • Compact Monostrand
  • CFRP strand (Carbon Fibre Reinforced Polymer)

  • Internal elastomeric dampers

  • Fire protection
  • Lightning protection
  • Ice shedding control
  • Blast protection

  • Coloured HDPE duct
  • Smart LED solution
  • Integrated lighting module

Suspension bridge

Suspension bridge

  • Standard anchorage
  • Clevis anchorage
  • Multihole saddle
  • Built-in saddle
  • Suspension bridge collar

  • Monostrand
  • Cohestrand

  • Suspension hanger

  • Fire protection
  • Lightning protection
  • Ice shedding control
  • Blast protection

  • Coloured HDPE duct
  • Smart LED solution
  • Integrated lighting module

Cabled stadium roof

Stadium roof

  • Standard anchorage
  • Clevis anchorage

  • Monostrand

  • Fire protection
  • Lightning protection
  • Ice shedding control
  • Blast protection

  • Coloured HDPE duct
  • Smart LED solution
  • Integrated lighting module

Our references in cable systems installation

Strand technologies

Strands are the main components of Freyssinet Parallel Strand System (PSS) cables, and are often referred to as main tensile elements. They are the modular elements that allow full cables of any size to be made from lightweight yet durable elements bundled together. Freyssinet has developed two technologies, known as Monostrand® and Cohestrand®, which set the standard in the construction of cable structures.
Corrosion protection is key in the durability of cable structures

The monostrand technology:
full corrosion barrier and high fatigue resistance

Monostrand

One of the most important move in this area is the development of the Monostrand technology -for individually protected strands, that was carried out by Freyssinet at the end of the eighties and installed on a few bridges as soon as 1988. The objective was to get a protection that is durable, flexible enough to accommodate deformation and elongations and that can connect to the anchorage in a proper way.

Several years of R&D lead to the industrial development of the wax and HDPE (High Density Polyethylene) sheathed semi-bonded mono-strand for which the sheathing is semi-bonded to the steel strands thanks to a qualified amount of wax. The HDPE sheathing is tight enough on the strand so that thermal expansion is the same for both materials.

Key advantages

01. High corrosion protection

Triple barrier corrosion protection: the strands are galvanised, waxed and coated with HDPE.

02. Redundancy

Each strand is individually protected and anchored, which provides a high level of performance and durability.

03. Modularity

The number of strands is adjusted to the required force in the cable.

04. High durability

Improved service life, thanks to the proven endurance of the Monostrand system.

05. Optimized design

Steel grade up to 2160 Mpa strand for reduced cable size.

06. Longest track record

The first major reference for Monostrand system was the Normandy Bridge in France, which paved the way for modern stay cable technology.

07. A solution for each project

Monostrand systems are tailored to meet all your needs, from long-span cable-stayed bridges to suspension bridges.

08. Easy maintenance

Possible replacement of a partial cable section.

Cable systems: our range of strand technologies

Monostrand® technology

The strands are galvanized, waxed and individually sheathed with a continuous wear resistant HDPE sheathing, providing each strand with a triple protection system. The system is suitable for 1860 and 2160 MPa steel grades, and compliant with all national and international standards. A compact version is available for specific project requirements, whenever the wind fairing surface of the cable layers should be reduced. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Individual tensile elements for redundancy
  • Individual corrosion protection system,
    triple corrosion barrier
  • Cable force preserved,
    no cable elongation after initial tensioning

Cohestrand® technology

The specificity of the Cohestrand technology is the co-extrusion of a proprietary bonding resin and polyethylene onto the strand, with precise control of the extrusion parameters to achieve a sufficient bond. This process is carried out at Freyssinet’s production sites and is subject to strict quality control. The minimum shear resistance of the compound, between the outer sheath and the seven-wire strand, is 4 MPa at 20°C. This method ensures that the triple barrier strand protection is of industrial quality, consistency and reliability.
In order to reduce the cost of the technology, a specific Locally Cohesive Strand (LCS) has been developed for extradosed bridges. Applications: cable-stayed bridges, suspension bridges, extradosed bridges.
  • Full locking of sliding force
  • Continuity and redundancy of corrosion protection
    through pylon saddles or suspension collars
  • Cable force preserved,
    no cable elongation after initial tensioning

Carbon Fiber Reinforced Polymer strand

The Carbon Fiber Reinforced Polymer (CFRP) is an advanced composite material with the following advantages: high strength, light weight, no corrosion and excellent fatigue resistance.
Unidirectional CFRP can hence be used as an alternative to steel cables when the total weight of the cabled structure needs to be reduced. Applications: cable-stayed bridges, stadiums.
  • Flexible cable installation and replacement
  • Inert to corrosion mechanisms
  • Cable force preserved,
    no cable elongation after initial tensioning

Strand solutions

Download our technical datasheets
Documentation

Our references for cable systems

Anchorages

Anchorages are engineered by Freyssinet internal design team to extend the life of stay cables. They are also manufactured in-house to ensure the highest level of manufacturing control. Our modular solutions cover all needs from short cable hangers using clevis up to very long span cables.

Anchorages performances

Anchorages perform the following three main functions:

  • they transfer the force from the stay cable to the structure
  • they manage strand tension variations to ensure maximum endurance
  • they protect the individual anchor elements from environmental attack, including corrosion.

The durability of structures is one of the main concerns in the engineering field.

Poor design or installation can jeopardize the structural integrity of the bridge.

To be competitive, the cable system and its anchorage must be able to adapt to different constraints and configurations, while using a maximum of standard products.

The choice of the most appropriate anchorage system depends on its location on the structure, the performance requirements and the expected functionality. Expert advice is a must.

On cable structures, the construction phase has a major impact on the final design of the structure. Design and construction should preferably be carried out by the same specialist company.

Advantages of Freyssinet's technology

01. Longest track record

Improved continuously since the mid-1970s, Freyssinet stay cable technology is the world reference in terms of fatigue resistance, protection against corrosion, ease of inspection and replaceability.

02. Durability

• Double barrier corrosion protection on the entire cable and anchors
• Individual strand anchoring for optimized protection
• Outstanding fatigue performance

03. Improved bending fatigue resistance

Integrated bending filter (patented) capable of handling angular deflection up to 50 milliradians.

04. Axial fatigue

Wedges designed to resist 300 MPa stress amplitude at 45% of ultimate strength for 2 million cycles.

05. A solution for each project

Technologies adapted to the needs of your projects, from the Parallel Strand System anchor with full options for long-span bridges to the cost-effective extradosed bridge anchorage.

06. Full service

As the undisputed pioneer, Freyssinet will assist you in the selection of the system's components, including the anchorages, which are one of the key components.

07. Reliable installation

The Monostrand system patented by Freyssinet is implemented using the Isotension process, an exclusive Freyssinet technique that enables cables to be installed using light equipment.

08. Easy replaceability

Strand by strand installation and replacement with minimum disruption to the operation of the structure.
Cable systems

Our range of anchorages technologies

The complete designation of Freyssinet anchorages gives the type of anchor (Standard, Extradosed, Clevis) as well as the useful characteristics for their installation: Adjustable or Fixed, Active or Passive, with or without duct fixing, etc.

As a matter of example, the 37 SFPD 1960 stay anchorage includes the following features:

  • Standard anchorage for 37 strands
  • 1960 MPa grade steel
  • Fixed model
  • Passive anchorage
  • With Duct fixing

Standard anchorages

The Freyssinet standard anchorage is a compact anchor with two possible configurations, fixed and adjustable. The two versions can be combined at each end of the cables. This makes it possible to adjust the tension and de-tensioning of the cable. Strands can be easily weighted, re-stressed or unstressed as well. A specific range is available for cold environment (-20°C). Applications: cable-stayed bridges, suspension bridges, stadiums.
  • Proven reliability on the largest structures
    and on the longest parallel strand systems
    installed to date
  • Waterproofing at cable ends
    with patented stuffing box
  • Strand-by-strand installation and replacement
Standard anchorage specifications
Configuration…

Adjustable and fixed versions allowing for cable adjustment capability

Type of anchoring…

Individual anchoring by jaws

Type of strand…

Freyssinet Monostrand or Cohestrand®

Range…

Up to 192 strands, tailor-made capacity if required

Maximum tensile force…

Conical wedge specially designed to handle tensile force up to 2160 MPa

Allowed stay cable rotation…

Up to 50 mrad strand deviation, with filtering device to guarantee cable endurance

Stroke…

Adjustment stroke from 100 mm up to 1 m for adjustable anchorages

 

 

Extradosed anchorages

The extradosed anchors were developed by Freyssinet to meet the specific requirements of extradosed bridges, in particular the higher tension forces of the cables and the lower variation of stresses due to fatigue compared to standard stay cable bridges. They are compact and can be used at the deck or pylon level, or in combination with multihole saddles at pylon level.
  • Strand-by-strand installation and replacement
  • Cable length adjustment
    during and after bridge construction
  • Tensioning adjustments possible during service life
Extradosed anchorage specifications
Suitable for…Extradosed bridges, short to medium spans (30m to 150m) 
Type of anchoring…Individual anchoring by jaws
Type of strand…Freyssinet Monostrand or Cohestrand®
Range…From 12 to 109 strands, tailor-made capacity if required
Adjustable block…Tension adjustment using ring jack and shims
Allowed stay cable rotation…Up to 10mrad strand deviation with filtering device to meet the needs of  extradosed bridges

Clevis anchorages

Designed specifically for thin footbridge pylons, arch bridges or suspension hangers, the clevis anchorage is a high-performance hinge anchor that allows a cable to be connected to a structure, without the need for an anchor chamber. Depending on project requirements, it can be combined with a standard anchorage or another clevis anchorage. Fixed and adjustable versions can also be combined, which will determine the cable anchoring method.
  • Flexible cable installation and replacement
  • Waterproofing at cable ends
    with patented stuffing box
  • Cable length adjustment after installation
Clevis anchorage specifications
Configuration…

Fixed and adjustable models
Fixed models with embedded block. Visible block on request

Type of anchoring…

Individual anchoring by jaws or swages

Type of strand…

Standard strand, diameter 15,7mm, cross section 150mm²

Range…

Up to 169 strands (depending on fork type)

Installation…

Semi-prefabricated cable or strands manufactured during their installation (direct unreeling method)

Stroke…

Cable length can be adjusted once the stay cable is installed using a turnbuckle system

Multihole saddles

A new concept of deviation saddle designed by Freyssinet, the multihole saddle allows for individual deviation of each tensile element, with the strands passing through the saddle via separate curved cavities. These cavities have a specific cross-sectional geometry ensuring easy threading during installation and high friction during service life. The differential service loads between each side of the pylon are taken up by the friction between the strands and the cavities in the saddle body. The positioning of the saddle in the pylon frame is straightforward. Applications: cable-stayed bridges, suspension bridges, extradosed bridges.
  • Outstanding axial and bending fatigue behaviour
  • Durable waterproofing
    with rainproof connections at saddle ends
  • Preservation of matrix at ultimate cable tension
    ensured by the UHPFRC cast into the saddle cavities
Multihole saddle specifications
Strand compatibility…

Cohestrand® or Locally Cohesive Strand (LCS), diameter 15,7mm, cross section 150mm²

Grade available…

1860 MPa or 1960 MPa

Saddle minimal radius…

1500mm

 

Built-in saddles

Built-in saddles are rigid links designed to connect two cable sections on either side of a pylon, with standard anchorages at each end. They combine the functions of anchoring to the pylon and transmitting the load through it, with easy integration into the pylon regardless of its design. As built-in saddles are welded components and provide a fixed point in the pylon, non-symmetrical live loads are allowed. Applications: cable-stayed bridges, suspension bridges, extradosed bridges.
  • Cost-effective solution at pylon level,
    compatible with all Freyssinet anchorages
  • Factory prepared, installed on site
    with the concrete casting of the pylon
  • Access allowed at anchorage protrusion
    for control and maintenance if necessary
Built-in saddle specifications
Suitable for…

Concrete pylons, possibly steel pylons
Various pylon geometries

Type of anchoring…

Compatible with extradosed anchorages

Type of strand…

Standard semi-bonded Monostrands

Range…

Up to 109 strands

 

Anchorage solutions

Download our technical datasheets
Documentation

Our references of cable systems

Dampers: a viscous technology for smooth, constant and durable damping

Due to their low damping capacity, cable are subject to rain and wind induced vibrations, which can affect their performance and durability. Dampers have therefore become a common additional component in cable systems.

Dampers are mechanical assemblies installed between the cable and the bridge. They dissipate energy to ensure the stability of the cable.

Freyssinet generally offers standard dampers for cables longer than 80m, which are sufficient to meet the usual needs of medium and long span bridges. However, several damping strategies can be considered depending on the project and the type of bridge, the cable geometry and the local environment.

The typical damper assemblies are:

  • Internal Elastomeric Dampers (IED)
  • Internal Hydraulic Dampers (IHD)
  • Internal Radial Dampers (IRD)
  • External Hydraulic Dampers (EHD)

Most of our damping systems are based on a viscous principle specifically designed so that performance is not dependent on cable amplitudes or temperature, providing constant and smooth damping.

Viscous piston dampers have the advantage of being very versatile as their viscosity coefficient can be adjusted and their stroke can be adapted, with references ranging from 40 mm to 920 mm.

Why choose Freyssinet stay cable dampers for your project

01. Versatility

Standard range of viscous piston dampers to suit any project need, from 20 kN/s/m up to 500 kN/s/m and strokes from 20mm up to 900mm+

02. High performance

Up to 6% damping and more

03. Proven track-record

Used, tested and proven on the longest cables in harsh environments, up to 600m

04. Durability

Endurance and fatigue tested over millions of cycles

05. Low maintenance

Dampers with play-free connections

06. Custom models

Design service available to create a damper specifically adapted to your project specifications

07. Full service

Modeling capabilities to help you define your needs

Internal Elastomeric Damper (IED)

Vibration energy is dissipated by shearing in a highly damping rubber. The internal elastomeric damper has a diabolo shape designed to maximize the sheared area as the cable moves, regardless of the movement direction. IED technology is applicable to both new and existing structures. It is suitable for all types of stay cable systems and structures. It is particularly suitable for stay cables of less than 80 meters in length and footbridges.
  • Invisible system, fully integrated into the guide tube
  • Low maintenance
    - No exposure to potentially aggressive environment
    - No moving mechanic parts
  • Removable and replaceable
Internal Elastomeric Damper specifications
Suitable for …

Cable-stayed bridges and footbridges with a cable length of less than 80 meters

Range

Units up to 61 strands

Endurance

100 km cumulative stroke

Damping stroke

+/- 10 mm

Internal Hydraulic Damper (IHD)

The internal hydraulic damper is ring-shape and works by viscous flow to absorb the energy of the stay cable. It operates as a “jack” fixed onto the strands by means of a metal compaction collar and connected to the structure by a metal piston. The damper is placed inside a metal tube called a guide tube. The guide tube is bolted to the formwork tube, which allows the eccentricity of the cable to be corrected. Inside the ring cylinder, a silicone oil with optimized viscosity provides the required damping, depending on the characteristics of the cable stay. It is suitable for cable-stayed bridges or footbridges.
  • Effective damping, even for very small oscillations
  • System fully integrated into the guide tube:
    -No impact on aesthetics
    -No exposure to aggressive environment
  • Easily accessible, removable and replaceable
Internal Hydraulic Damper specifications
Suitable for …

Cable-stayed bridges with cable lengths of 80 to 150 meters

Range

Units up to 127 strands

Endurance

30 km cumulative stroke

Damping stroke

Up to 20 mm
No elastic stiffness

Internal Radial Damper (IRD)

The internal radial damper consists of three hydraulic pistons placed at 120° angles around the cable. The inner end of the pistons is attached by pin joints to a collar that clamps the strand bundle. The outer end of the pistons is attached by pin joints to a metal tube called a guide tube. The guide tube is attached to the structure (formwork tube) by a bolted flange. The efficiency of the system increases with the amplitude.
  • Consistent performance in all temperatures
  • High durability
    Low maintenance
    Protected from aggressive environment
  • Removable and replaceable
Internal Radial Damper specifications
Suitable for …

Cable-stayed bridges and footbridges with a cable length of less than 80 meters

Range

Units up to 61 strands

Endurance

100 km cumulative stroke

Damping stroke

+/- 10 mm

Damping efficiency

Up to 6% logarithmic decrement 

External Hydraulic Damper (EHD)

The external hydraulic damper consists of a rigid steel structure mounted with hydraulic pistons around the collar that clamps the cables clamping collar. As the damping efficiency increases with the distance between the damper and the anchorage, the external damper is used when the length of the guide tube and the elastic stiffness deteriorate the optimum damping. These dampers are designed on a case-by-case basis according to the structural requirements of the cable-stayed bridge.
  • High efficiency: the location is adapted to
    the cable length, the vibration nodes and anti-nodes
  • Consistent performance in all temperatures
    (hydraulic piston technology)
  • Easy to control and maintain
    Low maintenance
    Removable and replaceable
External Hydraulic Damper specifications
Suitable for …

Cable-stayed bridges with cable length over 300 meters

Range

Units up to 127 strands

Endurance

100 km cumulative stroke

Damping stroke

Up to 500 mm or customized

Damping efficiency

More than 6% logarithmic decrement

HDPE main duct (high-density polyethylene)

Double spiral thread ducts are available to disturb the flow of water along the cable and thus limit rain and wind induced vibrations. Applications: cable-stayed bridges, arch bridges, extradosed bridges.
  • Rain and wind induced vibration control
  • Transverse wind force on the stay cables
    reduced by 20% with the super compact system
HDPE main duct specifications
Suitable for …

Cable-stayed bridges, Extradosed bridges, Arch bridges

Range

Available up to unit 192, tailored upon request

Aerodynamic performance

Control drag factor of CD=0.6

Durability

Accelerated ageing tests show performances for up to 50 years

 

HDPE duct

A range of compact and super-compact stay cables with smaller diameters is also available to reduce the stay cable drag force.

Cross ties

Due to their flexibility, small mass and low damping capacity, stay cables are sensitive to high amplitude vibrations caused by wind, rain and movement of the supports. In addition to the usual devices, the use of customized cross ties can be recommended for longer cables, in order to increase the damping ratio of the vibrations compared to the standard values.
  • Effective dissipation capacity
  • De-correlation of the vibration frequency of the stay cables
    from the natural / modal frequencies of the structure
  • Improved in-plane stiffness of the stay cables
    Additional damping capacity thanks to cross-ties

Download our technical datasheets on our Damping systems

Documentation

Find our more in our case studies

Cable protection solutions

In addition to the risks associated with the construction of a bridge, owners must consider the risks throughout the life of the bridge, such as fire, lightning, explosion or ice formation on cables. We have developed specific solutions for those of you who wish to better control these risks and limit or avoid the closure of a bridge and its impact on the local economy.
Benefits

Why choose Freyssinet cable protection solutions for your project

01. A solution for each project

Solutions for each type of risk, which can be combined

02. Fully tested solutions

Our solutions are tested in internationally recognized laboratories such as SEFTIM for ligthning protection.

03. Easy replaceability

All our solutions are designed to be replaceable, regardless of their technology and whether they are mounted on new or existing structures.

04. Specialist development

All solutions are developed in-house by Freyssinet, who precisely specify and control the manufacture.

Cable systems: protection solutions

Fire protection

Fires are common on bridges due to traffic accidents or collisions between trucks and the bridge structure. They can cause cables to collapse, which is a major safety issue especially for closely spaced cables close to or above the roadway. Our fire protection system is qualified to maintain the temperature of the strands < 300 °C for 45 min up to 3h. It consists of a microporous material made from sand and does not affect cable endurance and lifetime. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Various durations of protection available.
  • Adjustable to any stay cable length or diameter
  • Easy to install on new or existing structure
Fire protection specifications
Design

Standard supplies with limited assembly work on site

Height of protection

Up to bridge owner – generally 12m above deck

Duration of protection

45 min, 1h, 2h and 3h available – 10 to 50 mm thickness

Damper compatibility

With any Freyssinet damper: IHD, IRD, EHD

Stay cable behaviour

Stay cable and anchor resistance qualified and guaranteed up to 300°C

Qualification

Protection against the most severe case: the hydrocarbon fire as per PTI recommendations (PTI DC45.1-18)

Lightning protection

The probability of a bridge being struck by lightning cannot be neglected. Freyssinet offers effective protection for the area not covered by the pylon lightning protection system, according to the highest protection class of the relevant European standard. Full-scale tests have been carried out in recognised laboratories and have qualified our system under real current and lightning strike conditions. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Stainless steel assemblies provide adequate potential
    and conductivity, while improving the corrosion resistance
    of exposed component.
  • The system is almost invisible from afar:
    it is either encased in the stay cable system
    or designed with thin components.
Lightning protection specifications
European Standard

Category 1 class protection as per IEC 62305, highest protection class

Lightning resistance over time

Compliant with long duration lightning current: 750A.s, most powerful stroke defined in the European standard

Lightning resistance by power

Compliant with strokes 200kA 10/350µs, 3,75 times higher than recommended by standard IEC 62305 series

Ice shedding control solutions

Our innovative cable de-icing system offers active and passive protection to bridge users against ice bombs hazards, caused by the debonding of ice from the surface of the ducts. The passive system significantly reduces the amount of ice falling from the cables. The active system, fully integrated into the duct, allows the ice to be removed remotely at any time. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Less bridge closures in winter
  • Possible turnkey combination of passive and
    active solutions with a predictive weather interface
    to optimize energy requirements
  • Low maintenance:
    - Durability of the passive system
    - Easy dismantling of the active system at deck level
Ice shedding control solutions specifications
Passive protection

Innovative micro texture of the duct to promote ice adhesion and limited aerodynamic effect

Active protection

Duct de-icing actuator operating with vibrations

Remote control

Fully compatible with remote control for simultaneous activation of all stays

Compatible with weather forecast

The active system can be coupled with weather forecasts.

Download our technical datasheets on our cable protection solutions

Documentation

Our references

Aesthetic enhancement solutions

Cable-stayed bridges are elegant and strong structures that can become iconic architectural landmarks. To further enhance their aesthetics, we have developed coloured ducts and lighting systems. Combining functionality, aesthetics and mechanical performance, our solutions are customised to your requirements.

Cable systems: aesthetic enhancement solutions

Coloured HDPE duct

Freyssinet’s stay cable HDPE duct is coextruded in two interconnected layers to provide the necessary mechanical strength and a high level of resistance to physical and chemical attack. The outer layer can meet the aesthetic requirements of projects, combining colours like a rainbow or simply drawing the flag of a country. Option available for up to 127 stay-cable units, bigger units on demand. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Overall aesthetic casing
  • Highly durable UV protection
  • All RAL codes available, tested for 50 years durability

Integrated lighting module

As an alternative to conventional public lighting, Freyssinet offers lighting modules directly fixed to the stay cables, at the desired height on the outer sheath. The lighting module and fixings are designed to meet all the quality requirements for which Freyssinet stay cables are renowned. Power up to 400 Watts. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Attractive design, customisable to the duct colour,
    adjustable in all directions
  • Perfect integration into the duct and bridge structure
    Excellent wind resistance
  • Easy maintenance and replacement
    No more clash between standard lamp mast and cable stays

Smart LED solution

Light-Emitting Diodes (LED) solutions have become more robust and compact and can now be fully integrated into the cable ducts, transforming any cable-supported bridge into a multi-pixel, remote-controlled LED display stand. The low-consumption LEDs are interconnected by electrical wires and incorporate all the electronics required to transmit power and instructions. The system is compatible with cables over 300m. It can also be installed on an existing cable-supported structures using half-shell assemblies. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Resistance to dust and rainwater (IP66)
    Durability exceeding 100 000 working hours
  • Various LED shapes,
    from 300 mm bar modules to 40 mm round pixels.
    Different layouts available.
    Light intensity adjustable from 0 to 100%.
  • Remote control system.
    Easy maintenance through visual inspection.

Download our technical datasheets on our cable aesthetic solutions

Documentation
Find out more in our case studies
Build
Vietnam

Bai Chay cable-stayed bridge

Concern over the magnitude of wind loading and potential for vibration that was predicted on the Bai Chay cable-stayed bridge in Vietnam led to the introduction of new, compact stay cables.
  • Cable stayed bridges
Build
Russia

Russky Island cable-stayed bridge

Russky Island cable-stayed bridge pushed the limit for cable-stayed structures, its main span setting a new world record and demanding extra-long cables designed for the region’s harsh climate.
  • Bridges
  • Cable systems
  • Cable stayed bridges
  • Dampers
  • Innovation
+3
Build
Vietnam

Cua Dai extradosed bridge using Cohestrand technology

Locally-cohesive Cohestrand technology was successfully produced and installed for the first time on an extradosed highway bridge which crosses the Tra Khuc River to create a coastal bypass of Quang Ngai city.
  • Bridges
  • Extradosed bridges
  • Cable systems
  • Innovation
  • Cohestrand
+3

Cable suspension solutions

The parallel strand system developed by Freyssinet, well known for cable-stayed bridges and extradosed bridges, brings advantages in terms of durability for suspension bridges and cabled stadium roofs.

We supply and customise the following elements to your project needs:

  • suspension hangers
  • architectural hanger systems
  • suspension collars
  • clamping collars

 

Our range of suspension cable solutions

Suspension bridge collars

The suspension collar is the key element in the stability for a suspension bridge, as it transfers the tensile forces from the hangers to the main suspension cable. Our solution is characterised by a high level of friction, thanks in particular to the padding of the jaws. Automatic locking ensures product safety: the locking force increases with the load of the cable hanger. Solution available for main suspension cable unit 4 to 192.
  • Control of the dilatation effect on the system
    at low temperature, to maintain the clamping force
  • High durability:
    - 3 levels of corrosion protection
    - Continuity of corrosion protection between
    the Cohestrand used for the hanger and the collar
  • Safety, thanks to the automatic locking system
    Replaceable without dismantling the main suspension cable

Suspension hangers

These suspension hangers are prefabricated with Freyssinet parallel strand system technology, to ensure the same durability as the main suspension cable. They are connected to the bridge deck either by clevis or by standard anchors and are tensioned with light equipment. Maintenance is identical to that of the standard stay cable system. From 4T15 to 55T15, the hanger system is designed for loads up to 700 tonnes. Coloured ducts are available.
  • Durability (100-year lifespan):
    - Double corrosion protection barrier
    fitted over the entire cable, including the anchorages
    - Outstanding fatigue performance
  • Redundancy:
    Each strand is individually protected and anchored,
    which provides a high level of safety
  • Modularity:
    The number of strands is adjusted to the force
    required for the cable

Clamping collars

Freyssinet clamping collar is custom designed for each project and is used on suspended roofs where compression masts are used to support the roof load. The clamp transfers the vertical load to the suspension cables and annular rings. The strand bundle is available in black or white.
  • Custom made for your project,
    in cast or machined steel
  • Transfer of the tangential force
    with a friction coefficient of up to 0.65
  • Durability as high as a cable stay system
    with a 100-year lifespan

Architectural hanger systems

Architectural hanger (HRod) systems can be used as hangers for a structure or as architectural bars or roof supporting elements. Each rod is end-threaded to ensure the connection with a clevis, a coupler or a turnbuckle. The thread is left hand on one end, and right hand on the other end, in order to ease the installation. The maximum length of a single bar is 11,80 m. Angular correction as clevis design allows for 10 mrad of misalignment (i.e. 0.5°), which is usually enough to compensate for potential structural inaccuracies. Higher angles on request. Applications: suspension bridges, buildings, steel structures.
  • Durability as steel hangers are
    galvanised or plated
  • Quick installation and maintenance
  • Large standard range and
    possible custom made solutions

Find out more in our case studies

Contact us

You have a question about our solutions or you already have a project in mind? Please fill out the form below and our teams will get back to you shortly.