Local natural stone for Vienna’s Stephansplatz

Building design

After eight months of construction, the Viennese can finally enjoy their Stephansplatz again. For the redesign, Gebhartser syenite and various granites were laid in a Roman bond. The majority of the total of 36,400 natural stone slabs came from Austria. One of the main attractions in the heart of Vienna is undoubtedly St. Stephen’s Square with its imposing cathedral. Around 80,000 people cross the square every day […]

After eight months of construction, the Viennese can finally enjoy their Stephansplatz again. For the redesign, Gebhartser syenite and various granites were laid in a Roman bond. The majority of the total of 36,400 natural stone slabs came from Austria.

One of the main attractions in the heart of Vienna is undoubtedly St. Stephen’s Square with its imposing cathedral. Around 80,000 people cross the large square every day. However, after four decades, the old paving around the Gothic masterpiece was showing considerable damage. The city announced an EU-wide open competition, which also included the redesign of the pedestrian zone. The first prize was won by the Viennese firm clemens kirsch architektur in 2007. While the design for the pedestrian zone (construction phase 1) was implemented promptly in 2008/09, construction work on Stephansplatz only began at the start of last year. In November 2017, however, those responsible were able to announce the end of the construction period at the ceremonial laying of the keystone.

The seemingly “wild” pattern of St. Stephen’s Square consists of three different colored natural stones: Mardetschläger granite, Schrems granite and Gebharts syenite. Most of the stone material comes from the Waldviertel region, almost 150 kilometers to the south. A total of four different formats (32.7 x 32.7 / 32.7 x 66 / 66 x 66 / 66 x 99.3) have been used for the Roman dressing. The large “colorful” surface is repeatedly interrupted by anthracite-colored Gylsboda granite from Sweden. The dark “decorative stones”, which appear to have been placed at random, each form a kind of cross structure that subtly refers to the undirected urban space that is open on all sides.

36,400 natural stones

In the second construction phase, the adjacent junctions and a small side street of Stephanplatz were also included. Around 36,400 natural stones now cover the 10,700 square meter area around the cathedral. The surface of the stones, laid using the unbound construction method, is bush-hammered.

In their concept, the planners also paid attention to improving the lighting of the square and even quadrupled the number of public seating areas. And so there are plenty of opportunities for tourists and locals to enjoy the new square design after the long wait.

Read more about Austrian stones in our special feature in STEIN issue 4/2018.

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Franken-Schotter takes over the BIM planning office Pronag

Building design

a cultural and congress center in Feldkirch in Vorarlberg, Austria

The natural stone dealer already offers BIM services and intends to expand this area with the acquisition.Franken-Schotter took over Pronag on July 1, 2018 as part of an asset deal and transfer of operations. The parties have agreed not to disclose the purchase price. Pronag is regarded as a leading German BIM planning office for natural stone work. The reference list is long and includes, for example, the 3D BIM […]

The natural stone dealer already offers BIM services and intends to expand this area with the acquisition.

Franken-Schotter acquired Pronag on July 1, 2018 as part of an asset deal and transfer of operations. The parties have agreed not to disclose the purchase price. Pronag is regarded as a leading German BIM planning office for natural stone works. The reference list is long and includes, for example, the 3D BIM planning of the Berlin State Library and the redesign of the Rhine promenade in Basel – the latter a collaboration with Franken-Schotter.

Dr. Torsten Zech, Managing Director of Franken-Schotter, comments on the acquisition: “With this takeover, we are addressing the Building Information Modeling megatrend, which will fundamentally and sustainably change the construction industry in the coming years. We are already seeing strong demand, particularly from the English-speaking world. In addition, BIM will provide us with massive support in the digitalization of internal processes and production workflows.”

In a 2017 study , management consultants Roland Berger found that BIM is increasingly becoming the standard for the entire construction industry. And will mark a turning point in the construction industry. Marc Aßmann, master stonemason and Managing Director of Pronag Bauherren, said in an interview in STEIN S02/2018 that BIM should be used as early as possible in the planning process, as the higher the added value. Franken-Schotter is planning to do just that and wants to “be a role model within the industry with our integrated and resource-efficient value chain”. The Pronag brand will be retained and Franken-Schotter will continue to offer external natural stone planning services from its Dresden site.

New process developed to prevent paper disintegration

Building design

Scientific Director of the European Research Center for Book and Paper Conservation-Restoration. Photo: Danube University Krems

Mag. dr. hab. Patricia Engel is Scientific Director of the European Research Center for Book and Paper Conservation-Restoration at Danube University Krems. In an interdisciplinary research project, she and her team, together with the University of Graz, developed a method to stop acid-induced paper decay. A commentary From the middle of the 19th century, paper was produced from shredded […]

Mag. dr. hab. Patricia Engel is Scientific Director of the European Research Center for Book and Paper Conservation-Restoration at Danube University Krems. In an interdisciplinary research project, she and her team, together with the University of Graz, developed a method to stop acid-induced paper decay. A commentary

From the middle of the 19th century, paper was produced from shredded pieces of wood in order to make it available to the masses at low cost. Until the production of higher quality paper began after 1945, almost everything was printed and written on groundwood paper: books, newspapers and letters. A low pH value of the groundwood pulp paper leads to the destruction of the cellulose chains during longer storage. In addition, alum was used as an auxiliary material in paper production, which leads to the formation of acid, which further promotes paper decay. The paper becomes brittle. An unstoppable ageing spiral develops, which is further accelerated by poor storage, heat, light and humidity. Currently, the holdings of many libraries and archives are affected by acid-induced paper decay to varying degrees.

New procedure for paper deterioration

To ensure the preservation of these documents, we have developed a new process in an interdisciplinary team of conservators and chemists from Danube University Krems and the University of Graz. Based on previous mass deacidification processes and with the help of innovative chemical and nanotechnological methods, it deacidifies the paper, leaves behind an alkaline reserve and makes the paper reusable. And if desired, it can be used to disinfect microorganisms at the same time – or, in a modular way, just to combat microorganisms. The patent is pending. If it is successful, it will close a research gap in Austrian paper restoration.