Residential tower Hoog aan de Maas D3BN (DHV Bouw en Industrie BV, Rotterdam) PO Box 2078 3000 CB Rotterdam the Netherlands Tel.: +31 10 404 40 40 Fax: +31 10 414 39 75 Contact: M. Winifred van den Bosch Email: [email protected] Webstite: www.d3bn.nl Partners Developers Johan Matser Project Development, Hilversum; AM Development, Gouda; Bouwfonds Property Finance, Hoevelaken Architects 01-10 Architecten, Rotterdam; Philip Johnson Alain Ritchie, New York Structural engineers D3BN, DHV Building and Industry, Rotterdam Building contractor J.P. van Eesteren BV, Rotterdam Projectteam D3BN Consulting engineer Ir. J.G. Kraus Projectmanagers Ing. R.Stark; Ir. A.F.R.M. Engels Structural engineers Ir. W.H.G. van den Bosch; Ir. H.J. Kuijer D3BN civil engineers, DHV Building and Industry General D3BN Civil and Structural Consulting Engineers was founded in 1916 and designs, draws, calculates and supervises the execution of load-bearing structures of concrete, steel, wood and glass in utility building and housing.D3BN forms part of the advisory group DHV. In this way our alertness is increased as far as multi-disciplinary projects are concerned and it also offers access to the international market. Since November 2004, D3BN uses the name of its parent company: DHV Building and Industry. Innovative and customer-oriented D3BN is active in the highest segment of the architectural market ranging from office buildings to museums and from housing to high-rise buildings. D3BN leads the way as far as developments in society are concerned such as multiple use of capacity, durable building, accountable and environmentally friendly use of materials. Still, for us, construction is never a target on its own: we explicitly offer our knowledge and creativity to the client and construction team. Process and teamwork We are deeply convinced of the importance of combined action in design, architecture and user demand and its impact on the quality and durability of buildings and infrastructure. During the last few years, in addition to the technical challenges, there has been more and more emphasis on innovation in building and design processes. That’s our main goal. Organization D3BN civil engineers has 85 employees and has offices in Rotterdam, The Hague and Zaandam. The way of ensuring the quality of its work is founded in a book of quality that is according to the code NEN ISO 9001. The annual turnover of D3BN in 2004 was approximately 6,5 million Euro. Special Location In Rotterdam on the river bank of the Maas a high rise apartment building with a special quality will be built. The high rise forms one part of a bigger project ‘High rise Boompjes’ which comprises three buildings and a parking garage. The former office of the Bank of the Netherlands will be redeveloped, an office tower for the company Ernst & Young is being built and the construction of a 4 level underground parking garage for 650 cars is in full progress. Shortage of space Shortage of space is the keyword for this project. There is almost no space for building the office tower and the parking garage. For the apartment building there is even less space. In this part of Rotterdam on street level there are just two small places of ground where there is enough space to construct a foundation. The rest of the structure cantilevers over the former Bank of the Netherlands. This lack of space demands an ingenious solution and first class tools to design it. The structure There are just two points where the building can touch the earth. This makes designing it a challenge. The shape of the floor plan (a triangle with the biggest part cantilevering over the bank) makes it even more complex. Therefore D3BN, together with the rest of the design team, designed a hybrid structure. The first part of the structure is cantilevering over the bank. This part is made as light as possible. Hollow core plates realize a floor that has a maximum span of 14 metres. In this way the apartments are flexible in use, and the buyers can choose their optimal arrangement of rooms. The hollow core plates are situated on steel beams that are placed in giant trusses. These trusses cantilever almost 21 metres and are 12 storeys high. The trusses rest on giant concrete XX shaped columns next to the former Bank. The second part is situated above a road. It forms a bridge between the XX columns on one side and the concrete core on the other side of the road. This part is made heavier. Here no hollow core plates are used but massive concrete floors that have a maximum span of 9 metres. These concrete floors are also situated on steel frames. These frames span from the concrete columns next to the bank to the concrete core on the backside. The frame is formed by a ‘vierendeel’ frame in the inner part and by trusses in the facades. A third part is called the ‘city apartment’ because these apartments are situated towards the hart of the city. This part cantilevers above the street. It has light hollow core plate floors and steel trusses and ‘vierendeel’ structures in the façade to bear these floors.The structure of steel and concrete above the ninth floor rests on two heavy concrete parts: a XX formed line of columns next to the Bank and a core that is situated next to the harbour. In this core there is space for some extra apartments, mechanical and electrical installations and some storage capacity. The columns and the concrete core are 35 metres high. Foundation The foundation of the tower can also be considered hybrid. The towers balances on the line of columns next to the Bank. Therefore the loads on it are huge. Approximately 20.000 metric tons rest on these columns. To reduce the settlement of the underground very long piles have been designed. These piles have a length of 56 metres. Their base rests on the deep sand layer in the underground of Rotterdam. Normally foundations in this western part of the Netherlands reach to the second sand layer, 20 metres below sea level. Under this second sand layer there is a thick layer of clay. This clay has the characteristic to creep. Because the tower has two foundation parts, which have complete different levels of load, we do not want this creep to occur. The long piles used reach the third sand layer that is stiffer and does not creep. The concrete core holds the tower that balances on the XX columns in place. Depending on wind direction and the load factors used, this core can be under compression or tension. Therefore the core is prestressed (with steel) to 102 Company Project Residential tower Hoog aan de Maas SCIA User Contest 2005 / Commercial and industrial building 3 Categorie
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