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Post-Tensioning Systems, Bearings, Joints… Our Products Are the Constituent Elements of Structures

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Post-Tensioning Systems, Bearings, Joints… Our Products Are the Constituent Elements of Structures NEWS THE VSL NEWS MAGAZINE • ISSUE TWO-2003 Corrosion, the VSL weapons! La Unidad Bridge, Mexico FACTS&TRENDS 4 Nails for Buddha protection 4 Management systems certification 5 ts BUDDHA 4 COVER STORY 6 CORROSION: The VSL weapons! h Electrically-isolated tendons 7 CRaron Bridge site in Switzerland 9 Piling up barriers against corrosion 10 Stay cables: corrosion handled for 100 years! 11 g SITE INSIGHTS 12 Taiwan: fast-track beams completed 12 CORROSION 6 Keen on speed at Kien, Vietnam 12 Shaft in rock at Lok Ma Chau, Hong Kong 13 hli Chile: 2,222 segments KIEN 12 on the Metro de Santiago 18 g SPECIAL REPORT 20 FOOTBRIDGES: Why not thin and blue? Very slender structures, a multiplicity of textures and as durable as granite: Ductal® hi makes all these bold advances possible… TECH SHOW 22 Men at work Delivery of the Puente de la Unidad, Mexico. MEN AT WORK 24 NEWS, magazine published by VSL International Ltd. • Scheibenstrasse 70 – Bern, Switzerland and VSL • Saint-Quentin-en-Yvelines, France. Director of Publication: Jean-Philippe Trin • [email protected] Editor in chief: Jane Rousseau • [email protected] Co-ordinators: Valérie Foyard, Carlos Such, Doris Tong, Brian Gallagher. Distribution: Cécile Parmentier • [email protected] Design: Red Line Photos: DM Allan, I. Masterton, J. Orozco, B. Strahm, others. Copyright: VSL • December 2003 Cover photo: Puente la Unidad ISSUE TWO • 2003 EDITORIAL Combating corrosion: a job for specialists Ground anchor tendons, stay cables, internal and external post-tensioning systems, bearings, joints… our products are the constituent elements of structures. They are part of the structural solution of a project, so corrosion prevention must be an essential concern in their design and application. Some new weapons in the fight against corrosion have been provided recently by our R&D team. These include electrically isolated tendons (EIT) particularly for ground anchors; VSL-HPI® grout optimised for the characteristics of the cement and additives; and the new CS 2000 post-tensioning system, combined with plastic ducts and specially designed isolating plates to allow total encapsulation of the cable. We are also offering technologies with our systems that enable clients to continually monitor some 3 structural parameters and track their evolution over time. The aim of all these systems and processes is to bring our clients greater confidence in the durability of structures. Besides our product R&D policy, we are constantly seeking to strengthen the competencies of our teams at the worksites and to improve the quality of the components they use, particularly in the areas of grouting and stressing of stay cables. Our network subsidiaries implement an active quality policy, as exemplified by VSL in Hong Kong, where recently we simultaneously obtained ISO9001:2000 (Quality), OHSAS18001:1999 (Health and Safety) and ISO14001:1996 (Environment) certification for all our activities. We are fighting the battle against corrosion as a team, within the VSL group, and with our clients and their engineering offices. Optimising details that will make a difference, and doing so during the design stage of a project, is an effective way to make structures more durable. Jean-Philippe Trin FACTS&TRENDS Stressbars Mivan Nails for Buddha protection Working by hand > VSL Philippines has successfully secured a contract for the design, supply and operation of nearly 3,000 m2 of a "Mivan" hand- laid aluminium formwork system for a 41-storey condominium project. All of the project's concrete elements are being formed using the "Mivan" system. Since no suspended ceiling has been included in the design, the client saw a distinct advantage in the high-quality and high-precision surface finish the system is able to produce, coupled with a reduced floor-to-floor cycle plus the fact that no tower crane time is required as the system is being moved by 4 hand. The capability of pouring difficult areas such as ledges, pipe chases and stairs as monolithic concrete pours also incited the > In March 2001, Afghanistan's from potentially-dangerous client to opt for this solution. VSL Taliban rulers partially destroyed rockfalls using nailing and netting will form over 103,000 m2 in all on the famous Buddhas of Bamiyan. techniques. VSL supplied free of the project, which is scheduled to Unesco has declared the charge pre-grouted permanent peak by July 2004. ■ Contact: monuments a world heritage site Y1050 stressbar nails (3.5 to [email protected] and as a priority to prevent further 4 tonnes) in order to secure the erosive damage. Geotechnical area around the smaller, though specialists Ing. G. Rodio SpA have equally as impressive, 35-m high France been instructed to secure the silty Buddha. ■ sandstone and agglomerate cliffs Contact: [email protected] Back on A29 > In June 2003, VSL France was USA awarded the post-tensioning contract for the incrementally- launched, prestressed concrete La Three PTI awards for VSL Bresle Viaduct viaduct (756 m long) > The awards presented at the Mention, Industrial and Special on the A29 motorway between Post-Tensioning Institute (PTI) Applications); and University Hall Amiens and Neufchatel-en-Bray Annual Meeting, held in California, Strengthening in Charlottesville, (Normandy). In 2002, VSL had recognize the year's outstanding Virginia (Honorable Mention, already provided post-tensioning post-tensioning projects within the Strengthening/Rehabilitation). ■ for 60 bridges along with more construction industry. VSL was Contact: [email protected] than 300 tons of prestressing steel. honored for the following: the Part of this post-tensioning work Interstate 895 Connector in was completed with CS 2000 Richmond, Virginia (Best in Class 6-12 units. This was the first use Bridges); Frank Lloyd Wright's on such a broad scale in France. ■ Fallingwater Restoration in Mill Contact: michel.guichard@vsl- Run, Pennsylvania (Honorable france.com NEWS N°2•2003 Certification PRESS REVIEW Management systems Post-tensioning: > In November VSL and Intrafor in The management systems are Hong Kong completed certification integrated which greatly improves the invention to ISO9001: 2000 (Quality), efficiency. This also allowed OHSAS18001: 1999 (Health & certification to be conducted, using of the century Safety) and ISO14001:1996 an integrated management system For its 100th anniversary, the (Environment) for all business units approach, which significantly French magazine "Le Moniteur", ■ and the full scope of activity, reduced the duration of the audit. no 1 for the construction industry, making them the first companies in Contact: [email protected] asked its readers to name the last the group to achieve this. intrafor.com century's most significant innovation. The building process using prestressing was awarded Strengthening the distinction and the specific project used to highlight this process was the Viaduct over the VSL launches a new line Rhone River in Avignon (southern > As a leading supplier of in the construction, repair and France) for the TGV Méditerranée specialty reinforcement systems, upgrade of buildings, bridges, high-speed train line: two VSL has launched in the US a line parking garages, and special independent concrete decks for of strengthening products for use structures. VSL’s product offering which VSL performed the includes carbon fiber- and prestressing work. glass-reinforced systems, 5 steel-reinforced systems, and post-tensioning systems, a full Go to Demon. A new Web site range of alternatives for structural dedicated to VSL monitoring upgrades, together with feasibility activities (contact: jbdomage@vsl- studies, load testing, design schweiz.ch) has been created to support, value-engineered provide the assigned project proposals, detailing, and engineer, main contractor and contractor consulting. ■ Contact: owner with remote access to [email protected] project data in real time: sensors, technical reports, calibration reports, videos, photos, etc. Earthquake protection VSL load cell. VSL (UK) was contracted to return to Kingston A frame for buildings? Bridge in Glasgow (Scotland) to > Designing a connection node load-check a selection of external PT tendons. During this inspection with a BFUP material is an old visit, VSL installed an Hc160 mono- idea, yet one to be applied. Using strand load cell onto one of the post-tensioning combined with existing external post-tensioned Ductal® nodes constitutes an tendons to ensure the long-term ongoing research effort between monitoring of these tendons. VSL and Japanese partners in the quest for cost-effective seismic protection. The use of post- tensioning necessitates unbonded strands at the level of the beam- making them difficult to design column connection: unbonded with conventional concrete. The strands allow the connection to use of Ductal® would considerably loosen, inducing the mild rebar to improve the overall system: the plasticize and hence allowing for enhanced ductility would smooth energy to dissipate. The nodes deformations. ■ Contact: therefore are heavily stressed, [email protected] NEWS N°2•2003 COVER STORY PRESTRESSING STEEL Corrosion: the EIT at Raron Bridge, Switzerland orrosion protection of post-tensioning tendons has become a significant concern for many C owners. The corrosion of prestressing steel may cause much more serious problems than that of normal reinforcement as prestressing tendons normally have a small cross-sectional area under very
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