Stay Cable 2008

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    V S L S S I 2 0 0 0 STAY CABLE SYSTEM

    DESIGN

    ENGINEERING

    SUPPLY

    INSTALLATION

    MONITORING

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    V S L S S I 2 0 0 0 2 S T A Y C A B L E S Y S T E M

    Industrial Ring Road Bangkok, 2006 Stay cables installed strand-by-strand.

    VSL: a worldwide networkVSLs organisation as a network of closely-

    cooperating regional units allows it to provide

    a full range of solutions and services worldwide.

    Customers have access to a local presence, while

    benefiting from global resources, know-how and

    expertise as well as VSLs continuing development

    of specialist construction techniques. The VSL

    networks valueadded services are combined

    to provide fully-customised solutions, from concept

    to site works, using highly-trained and experienced

    staff working in close partnership with clients.

    VSL: a commitment to Quality,Safety and the EnvironmentVSL pursues a strong QSE policy in keeping

    with its position as a technical leader in the

    industry. Local teams aim continuously toestablish, maintain and improve their pro-

    VSL MAINTAINS THE LEAD

    IN STAY CABLETECHNOLOGY

    active management systems and high

    performance standards.

    VSL recognizes that employees are the key to

    competitiveness and effective working prac-

    tices. The company is committed to safety

    first and strives for zero accident, with

    employees motivated to take the necessary

    responsibilities to achieve this goal.

    Clearly-defined measures are in place to

    promote sustainable development as part of

    VSLs contribution to environmental protection.

    VSL: a specialiststay cable contractorAs leader in stay cable technology, VSL paves

    the way with new developments. The last

    10 years in particular have seen a boom in

    stay cables, with a considerable increase inthe span lengths that can now be achieved as

    well as faster installation and erection cycles

    thanks to VSLs construction techniques.

    VSL has experience of more than

    130 cable-stayed bridges, including 40 in the

    last eight years, and its close participation

    with clients and builders has resulted in a

    next-generation technical solution.

    The VSL SSI 2000 System described here

    combines the latest developments with VSLs

    best solutions, and has already been used for

    dozens of bridges. The system offers high

    fatigue resistance, excellent corrosion

    protection and cable-force monitoring, as well

    as allowing adjustment, inspection and

    replacement of the strands. It maintains

    stringent durability standards, whilst

    incorporating new features for greater

    flexibility and simpler, more slender cablesand anchorages.

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    V S L S S I 2 0 0 0 3 S T A Y C A B L E S Y S T E M

    Las Glorias Footbridge - Spain, 1991Supply of the stay cables and supervision at installation.

    Uddevalla Bridge Sweden, 1998

    Stay cables installed strand-by-strand and equipped with anti-vibration

    friction dampers.

    La Unidad Bridge Mexico, 2003

    Full scope of bridge construction.

    Liebrueti Bridge Switzerland, 1978

    First VSL Stay cable bridge

    Cable installation with

    VSL lightweight equipment

    Recent VSL developmentsin stay cable technologyVSL Saddle, a patented solution allowing muchsimpler pylon design resulting in enhanced bridge

    aesthetics;

    Compact anchorage, leading to simplified designand construction of the pylon and superstructure;

    Compact stay cable system, resulting in a tighterarrangement of the strands and hence a reducedcable diameter and a lower cable wind load;

    Cable protected by dehumidificationtechniques, a patented solution offeringthe lowest wind load on strand cables,with a permanent monitoring;

    A choice of cable-vibration damping systems,which permits optimum load adaptation for eachstructure.

    Modern engineering:stringent standardsDesigners and regulators throughout the worldare demanding:

    increased durability of stay cables, includingcorrosion protection of both cable andanchorage, leak-proofing of the anchorageassembly, good anchorage conditions, easyinspection and maintenance, cablereplacement with minimal traffic interruption,cable vibration control and a compact staybundle with a reduced wind drag-coefficient;

    outstanding fatigue and static loadperformance levels (200MPa and 300MPastress range fatigue test for the SSI 2000anchorage assembly and components);

    improved aesthetics arising from theavailability of saddles, compact anchoragesand coloured cables;

    incorporation of damping systems into theanchorage.

    Main contractors also look for optimalconstruction schedules such as:

    a design that takes into account the closerelationship between deck erection and staycable installation;

    lightweight installation equipment to enableeasier operations and a more flexible erectionprogramme.

    Clients benefit from:

    enhanced durability that is built in;

    easier long-term maintenance, providingsubstantial savings.

    The VSL SSI 2000 stay cable system is designedto meet all of these demanding requirements.

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    V S L S S I 2 0 0 0 4 S T A Y C A B L E S Y S T E M

    High fatigue performanceAnchorages include design features to filter

    out vibrations and bending stresses in the

    cable before they can reach the anchorage

    wedges. Sample stay cables have been

    subjected to fatigue testing with cable angular

    deviations as defined in the latest PTI and fib

    recommendations. Anchorages can be

    equipped with additional cable protection

    systems where unusual cable deviations need

    to be taken into account (see page 6).

    High durability and a newstandard of protection

    a) For the corrosion protection of the steelanchorage components, VSL has developed

    a new system that provides the best protection

    in the most aggressive environments. It enables

    100 years of maintenance-free operation for

    non-accessible components.

    b) Individual encapsulation of each strand

    within the anchorage avoids the risk of

    corrosion migration between strands. Full

    encapsulation is achieved by providing each

    strand with its own protection system.

    c) Complementary barriers provide a degree of

    redundancy to ensure the leak-tightness of the

    anchorage. The sealing system has passed the

    various tests as defined by fiband PTI.

    Cable replacementwithout traffic interruptionThe very compact nature of the anchorages

    allows installation in confined spaces within

    box girders and pylons. The single strand

    installation method and stressing operations

    have been optimised to facilitate cable

    installation using very lightweight equipment

    for greater flexibility in construction.

    Easy incorporationof a VSL internal damping systemThe stay cable system can be designed with

    provision for later installation of a VSL

    vibration damping system, should it provenecessary (see page 14).

    SSI 2000: VSL STAY CABLE TECHNOLOG

    Individual encapsulationEach strand separately protected

    inside the anchorage

    Severalcomplementary

    barriersFor anchorage water

    tightness system

    Individual strand deviation deviceFiltering cable bending stress at the anchorage device

    Increased corrosion

    protectionFactory applied individual protection

    treatments, for a design life of 100 years

    in the most aggressive environments,

    without maintenance

    High fatigue performanceVSL strandsHigh fatigue performance over 300 MPa

    stress range at 2 millions cycles.

    Compatible with VSL SSI Saddle

    Compact anchorageLength of a fixed end anchorage

    for 127 strands is only 440mm.

    High fatigue resistance

    VSL anchorageDemonstrated by fiband PTI fatigue tests

    with combined tension and bending action.

    The SSI 2000 Stay Cable System is based on proven stay cable wedge/strandanchorage technology, which has been in use for more than 30 years. It meets

    the most stringent requirements and has been used on more than 120 stay

    cable projects. The system has successfully passed extensive full-scale fatigue

    testing, including the new leak-tightness tests required by the PTI and fib.

    Adjustable(orfixedend)anchorage

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    V S L S S I 2 0 0 0 5 S T A Y C A B L E S Y S T E M

    Reduced cable wind loadsThe VSL stay pipes installed on the bridges are

    generally equipped with external helical ribs to

    suppress vibrations induced by rain and wind.

    Wind tunnel testing has demonstrated the

    efficiency of the VSL-designed helical ribs in

    reducing drag at wind speeds up to 70m/s.

    The VSL compact system:SSI 2000-C for long cablesWind load on the cables can be an important

    parameter for the structural design of bridges with

    very long cables. For these cables, VSL has

    developed SSI 2000-C, an adaptation of the

    standard SSI 2000. It uses the same anchoragesand connections but features a 20% reduction in

    FOR BRIDGES

    VersatilityDesigned to accommodate a VSLs vibration damping

    system which can be installed retro-activelyLow drag coefficientMeasured in wind tunnel

    Replaceable stay cable systemEach strand can be individually checked

    and at any time, replaced and re-installed.

    Complete cable is replaced with closure

    of

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