CBX Tower BESIX Gemeenschappenlaan 100 Avenue des Communautés 100 1200 Brussels Belgium Tel: +32 2 402.62.11 Fax: +32 2 402.62.00 Email: [email protected] Contact: M. Jean-Louis Govaerts Email: [email protected] Website: www.besix.com BESIX is a subsidiary of the BESIX Group (previously SBB), founded in 1909, consisting of industrial companies in the construction, electro-mechanics and real estate sectors. BESIX’s activities cover almost every field of construction. A solid knowledge and experience has been built up mainly through the technologies used in marine construction. BESIX’s competencies can be seen through the works in the ports of Antwerp, Ghent and Zeebrugge in Belgium, Gwadar in Pakistan, Sharjah and Khor Fakkan in the United Arab Emirates, the «Piet Hein-tunnel» in Amsterdam (Netherlands), the four siphons under the Suez Canal (Egypt), the gas terminal at Dabhol (India) and the jetty at Mellitah (Libya). Not forgetting large numbers of quays and quay walls in the Middle East, Africa and across Europe, like the quay wall of the Kluizendok at Ghent (Belgium) and the extension of the quay wall at Dunkirk (France). BESIXalso operates in other sectors such as infrastructure projects, large buildings, industrial and environmental projects. Challenges it has successfully met in these sectors, including tunnel and bridge building - in particular for the high speed train links in Belgium and the Netherlands - and airport construction work at Brussels (Belgium), Dubai (United Arab Emirates) and Roissy at Paris (France). The company won its first international orders in 1945, initially in Belgian Congo (now the Democratic Republic of Congo). In 1966, six companies in the SBB-BBM group combined their forces to bid for major contracts in the Middle East, which resulted in a solid footing in the African and Middle Eastern markets. Today, Six Construct is one of the leading construction companies in the United Arab Emirates. A new period of major expansion began in 1985, with a series of prestigious projects in the Grand Duchy of Luxembourg, Pakistan, Russia, Mauritius, the Czech Republic, Slovakia, Poland, Egypt, Botswana, Angola and India. At the end of 2002, BESIX decided to strengthen its presence on its «Domestic» market, defined as the zone within a 400 km radius of Brussels, including active involvement in public-private partnership (PPP) projects in Belgium. We also note the company’s return to Libya and Qatar in 2002-2003. If experience and knowledge are the foundation of BESIX‘s success, it is its proactive market approach, its flexibility and in particular its human capital that give to our company the added value that enables it to stand its ground in a fiercely competitive market. Every working day the primary concern of our 10,000 employees is to satisfy our customers with innovative «Design and Build» technical solutions, maintaining optimal quality within the shortest possible deadlines. General Information Client: TST CBX SARL, 125 Avenue des Champs Elysées, 75008 Paris Consultant: SETEC Tpi, Tour Gamma D, 58 quai de la Rapée, 75583 Paris Cedex 12 General Contractor: Besix SA, Avenue des Communautés 1001, 200 Bruxelles Structural design: Besix SA, Avenue des Communautés 100, 1200 Bruxelles Projet description and structural concept Preamble CBX tower stands along the boulevard Circulaire a few hundred meters from the Grande Arche at the Esplanade of la Défense in Paris. The urbanistic development of la Défense was decided after the war with a concept aiming to separate the pedestrian circulation on the surface from the motorised below. Consequently, a slab covers huge parking spaces and numerous vehicle and railway tunnels. This slab, which consists of large esplanades, kiosks and greenery, is bordered by office towers and apartment blocks that are in a deliberately modern architectural style. Architecture The CBX tower has the shape of an aeroplane wing standing vertically and culminating at 140m above ground. The façade is made of an entirely glazed curtain wall emphasising its crystal sobriety. At the esplanade level, a footbridge traverses the building, which is also the main entrance. The function of the tower is exclusively for office use and its space is organised as follows: • Four underground levels dedicated to technical rooms and few parking spaces.- Three levels between the ground floor and the esplanade level consisting of service rooms, delivery docks, kitchen and office restaurant. • Three levels between the esplanade level and the transfer level with space for reception, kiosks, terraces and more technical equipment. • Twenty-seven office levels. • Three top levels of terraces and technical room. Structural concept and particularities The structure is entirely in reinforced concrete. A central core incorporating lifts, stairs, technical shafts and sanitary blocs provides the bracing. The slabs are spanning from this central core to the façade supported by circular columns spaced at 8.1m. The project is located on a site crossed by numerous major underground networks that have a determining impact on the geometry of the infrastructure. This situation led to a complex foundation system composed of a raft under part of the building and, under other parts, very large diameter piles with transfer beams receiving huge loads. At ground level, the tower is traversed by a road and at level +3 (level of the esplanade) by a public footbridge. Moreover, at level +5, the straight façade is moved to the outside by 2m with a change of column vertical alignment. Finally, also at +5, the central core is enlarged. These criteria made it necessary to foresee a transfer level composed of 2.2m thick slab and deep beams. Numbers • Depth of excavation: 18m • Height above ground: 140m • Total surface area: 45000m² • Quantity of concrete: 32000m³ • Quantity of steel reinforcement: 3600T • Number of structural construction drawings: 727 • Number of electromechanical drawings: 563 • Number of architectural drawings: 435 • Completion time: 31 months • Completion time for one typical floor: 1 week 98 Company Project CBX Tower SCIA User Contest 2005 / Commercial and industrial building 3 Categorie
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