Gevelsystemen: Grote elementen of stijl- en regelwerk - TU Delft

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Summary in english // Bouwtechnologie // 2009 - 20101// Atelier SADD The scope of this research project is a comparison between two façade systems, the unitized façade and the post- and rail façade. While a unitized façade is completely prefabricated and only needs assembly on the building site, a post and rail system consists of individual parts and is assembled entirely on site. This basic diff erence between these systems of façade design and construction leads to many specifi c advantages and disadvantages between these systems. The main research question is as follows: Research question: “What are the specifi c advantages and disadvantages of a unitized façade system, compared to a traditional post- and-rail construction, when applied to a medium-scale public building with a mixed façade typology?” This research will be based upon a number of relevant criteria, which are buidling costs, construction process and constructon time, design and design adaptability and fl exibility and recycling options. These criteria are expected to deliver the most relevant data for the comparison. Unitized façade system: The unitized façade consists of large, prefabricated elements that usually span from fl oor to ceiling. The size of the elements is optimized for transport and the elements combine multiple functions of a façade. In case of a true unitized façade, the façade only consists of these large-scale elements, and no additional construction is required on site. Construction of these façade elements takes place in a factory, in a controlled environment, and the elements need only assembly when they are transported to the construction site. Usually, there will be no need for scaff olding in the assembly process. Due to the controlled environment in the fabrication process and the use of highly specialized machinery, the technical quality of the unitized elements can be very high. Dimensional tolerances can be minimized due to automated production techniques. The costs of design and fabrication of unitized façade elements are relatively high, while the costs of assembly can be kept low. Traditional post- and rail façade: The traditional post- and rail façade consisits of many individual parts that are assembled on site to form a complete façade. Prefabricated parts can be used, but most of the assembly will take place on the construction site. This means that more space and labour is used on the construction site. This type of construction also includes the use of scaff olding and diff erent kinds of construction cranes. Because the assembly of the façade takes place mainly on the construction site, there is less possibility for the use of advanced technical machinery. A traditional post- and rail façade has to take larger dimensional tolerances into account, and a lower degree of technical complexity can be achieved. Building costs are generally low in the production and design phase, especially when standard parts can be used. The costs of construction on site, as well as manual labour on site amount to the greatest part of the cost of this system. Both façade systems were tested in a practical application on the design for the Science Business Center. The most noticeable diff erence in this application is that the traditional post- and rail façade had signifi - cantly more repeting elements compared to the unitized façade. It was possible to achieve a satisfactory façade design using either of these systems. Comparison and conclusions: The conclusions of the comparison can be divided in the previously mentioned criteria. In terms of construction costs, a traditional post- and rail construction is signifi cantly less expensive than a unitary façade. These higher costs can however be compensated by cost reductions due to less delays and increased effi ciency in the unitized façade. The unitized façade also has a signifi cantly highter technical quality. When the building process is observed, the main diff erence is the large amount of storage that is needed for the parts of the traditional post- and rail façade. In projects with a limited area for construction, the //Robert Rozendal // 1169564 // Docenten // F. Schnater // P. de Jong // 7
8 // Bouwtechnologie // 2009 - 2011 // Atelier SADD //Robert Rozendal // 1169564 // Docenten // F. Schnater // P. de Jong //
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Gevelsystemen: Grote elementen of stijl- en regelwerk - TU Delft

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