PROJECT DATA

Publisher Krick in Würzburg/Germany

Project: Publisher Krick in Würzburg/Germany

Contractor (and Architects): Georg Göbel, Würzburg

MEVA Systems: all-plastic facing alkus, Special design, Sichtbeton

Planung und Betreuung: Büro Dreier Ingenieure, Würzburg

 
 
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Project

Publisher Krick in Würzburg/Germany

Self-compacting concrete opens new range of application
alkus plastic composite facing prone and curved

Clever engineering supports creative architectural plans
An extraordinary projection tower in the newly built headquarter of a German publishing house challenged the architects as well as the contractor and MEVA as the formwork supplier. Self-compacting concrete and alkus in team made up an excellent job which satisfied the owner and the architects.
An extraordinary projection tower in the newly built headquarter of a German publishing house challenged the architects as well as the contractor and MEVA as the formwork supplier. Self-compacting concrete and alkus in team made up an excellent job which satisfied the owner and the architects.

Publisher Krick in Würzburg Germany – a nationwide operating publishing house with encyclopaedias and phone books – is presently building a new headquarter near Würzburg. The total amount for the nine-million-Euro project which covers 30,000 m³ of space was planned by the office of Dreier engineers/ Würzburg. Besides the innovative concept for the domestic technique which was to be integrated in the shell structure, the planners required highest quality for 1,700 m² concrete.

A remarkable highlight of the extraordinary architecture of this complex is a 8 m high media-tower in the entrance hall area. As a reversed frustum this structure challenged not only contractor Göbel GmbH, also the concrete engineers and the formwork specialists from MEVA had to put a lot of knowledge and creativity to solve this task. The tower is designed to provide room for media projections and stage directions. Besides this it is a prestigious element of the whole design located directly in the entrance hall. The frustum tapers from the bottom with a diameter of 1.10 m to 3.60 m at the 7.95 m high top. The task was that the engineers of the planning architects Dreier required a wall thickness of 20 cm with persistent top quality concrete finish. The architects relied directly from start of the planning phase on “Self-Compacting Concrete”, because only this concrete promised to fulfil the high requirements. During this phase a team of experts was assorted by the contractor, which included specialists from the concrete supplier and from MEVA which was chosen as formwork supplier.

Several test-pours were necessary to research which parameters like concrete-formulation and environmental impacts like temperature are influencing the surface quality of the concrete. Due to the fact, that the structure is prone and curved, a facing was required which should be highly sustainable, ductile and even and smooth surfaced. Besides this, a classical custom-made formwork, made from wooden shelves would have generated a higher amount of labour time and material.
So the team decided to rely on the plastic composite facing alkus AL 21 which was deformed exactly according to the plans. The outer form was divided in fourths, preassembled and delivered. The tieless construction transferred the concrete pressure via nail-plates into the outer form and then into preformed wales. By bolting the wales of the sections together a circular ring was closed which took the concrete loads. The inner form was designed as a cone, also covered with pre-deformed alkus sheets. To protect the inner form from uplift while pouring, the cone was guided by an entry pilot to slip in the right position. Then it was secured by a steel rail and kept in position by ties.
Also the complex mounting parts were finished – as required – sharp-edged
In resume the effort was worth it. As the pictures show, all requirements of the planners could be fulfilled by using this sophisticated technique, and the media-tower obtains its distinguished architectural impression. Once more it is approved, that concrete and its clever engineering is one of the materials which enables remarkable architectural structures.

 
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