CITY HALL UTRECHT
© Stijn Poelstra

CITY HALL UTRECHT

Kraaijvanger as Architects

The new city-office of Utrecht is located on an auspicious but extremely complex site, partly above the new central station concourse and transport hub. The first five levels are devoted to public functions. Level 6 to 11 are rectangular and are linking two divided towers with offices.


The structure along the perimeter expresses the stability. The south tower is build on only 5 possible points of support. Because of the large footprint, the design pursues an ‘urban ecology’ with different floor plans seeking daylight in a variety of ways.


The interior design is for a flexible office with activity-based working spaces. Three floors (levels 6, 11 and 21) will serve as meeting places (plazas) and are characterized by higher ceilings.

CITY HALL UTRECHT

Flexipol Composites BV as Manufacturers

Already used widely in innovative industries such as aerospace and automotive, composite materials are gaining popularity in the building industry with landmark examples including the facade panels made for the New City Hall Utrecht. Basically, composite materials are made with two or more distinctly different constituent materials that when combined, result in a new material that is ideally lighter, stronger and less expensive. Here, Flexipol Composites worked with fire retardant resins, gelcoats and a vacuum infusion techniques to create diversely shaped lightweight facade panels with high fire and UV resistance, as well as a relatively inexpensive raw material cost.


More from the Manufacturer:


In 2008 Flexipol Composites ( formerly knownasPolux BV) was approached by architect Kraaijvanger (Dirk-jan Postel) to investigate if a composite façade for the New City hall of Utrecht would be feasible. The primary goal was to design and create a unique landmark building using a state of the art material for the facadecommonly not used in the building industry. Composites are widely used in many other industries( aerospace, energy, automotive) and Flexipol, being one of the largest and most experienced manufacturer of composite facade elements and RTM production techniques, was asked to develop a totally new production technique minimising the number of moulds required to produce the complex variety of elements. This study took 2 years and was completed in 2010. In these two years Flexipol not only developed a tailor-made RTM production system for the facade, they also did the complete testing ( fireproofing, sound, accelerated aging etc.) so the facade would meet the end clients requirements as well as compliance to the strict building regulations.


The manufacturing of the façade took place from august 2013 through to February 2014. In order to produce all Façade elements in such a short period of time, Flexipol had to train two other production companies in manufacturing composites using the specially developed RTM production method. A team of Flexipol production specialists provided hands on training and instruction and produced a complete written manual for the newly skilled workers to use during production.


As a result of the proven knowledge and ability to produce high quality façade elements Flexipol was asked to participate in the development and production of many other landmark buildings, some of which I am sure many people will recognize immediately.


A few examples: New City hall Utrecht, The new Hilton Schiphol, SoZaWe Groningen, VeiligeVeste Leeuwarden, LVI Groningen, de Matrix Hardenberg, Dunea Zoetermeer.

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