7/28/2019 Stay Cable 2008
1/28
V S L S S I 2 0 0 0 STAY CABLE SYSTEM
DESIGN
ENGINEERING
SUPPLY
INSTALLATION
MONITORING
7/28/2019 Stay Cable 2008
2/28
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.
7/28/2019 Stay Cable 2008
3/28
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.
7/28/2019 Stay Cable 2008
4/28
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
7/28/2019 Stay Cable 2008
5/28
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
