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24.08.2020 | 9 Images

TORKRET: 100 years of concentrated know-how in structural maintenance

TORKRET Stone®
TORKRET Stone® © Ed. Züblin AG

TORKRET Stone® can be used to faithfully reproduce the brick and mortar pattern of traditional masonry. The brickwork look with different types of stone and stone formats as well as the multi-colouring through relief-like contrasting and imitation joints give buildings an individual touch.

This press release has:

Press release Plain text

  • company was founded in 1920
  • Reconstruction, refurbishment, preservation and maintenance of buildings of all kinds
  • Pioneering spirit has defined company from the very beginning

The year 2020 is a very special year for TORKRET – even if the renowned Essen-based company had to postpone its planned celebrations. Established in 1920, TORKRET can look back with pride on 100 years of tradition and history. In all this time, the company has realised countless projects and pushed forward technical innovations in the field of structural maintenance.

TORKRET specialises in the demanding repair and renovation of buildings and civil engineering structures. This includes the preservation of heritage-listed buildings regardless of whether they were built of concrete or masonry. TORKRET today maintains five locations in Germany. Its 150 employees are deployed throughout the home market and in neighbouring countries. Since 2012 TORKRET has been part of Stuttgart-based Ed. Züblin AG, organised within the Structural Maintenance subdivision.

“The pioneering spirit of our company founder Carl Weber continues to shape TORKRET to this day. In its eventful history, the company has always focused on refining established processes and exploring completely new possibilities. And we will continue this tradition in the future,” says Willi Eiden, managing director of TORKRET.

100 years of innovative spirit and ambitious projects

TORKRET was founded by the engineer Carl Weber as Deutsche Torkret Baugesellschaft mbH in Berlin in 1920. Among other things, Weber developed and was granted a German patent for his own mortar and concrete spraying machine. He later perfected his shotcrete process to the point where it was ready for practical application, marking the birth of what he called “torcreting”, a procedure in which a mixture of aggregates, cement and water is applied to the substrate with the appropriate amount of compressed air. To this day, this is the most economical and sustainable solution for concrete maintenance over large areas.

TORKRET machines were first used in 1922 to repair the heavily damaged reinforced concrete structure of the five-storey Sarotti chocolate factory in Berlin. Two years later, the company repaired its first bridge – a structure in Berlin made of reinforced concrete – using shotcrete. This was followed by projects ranging from tunnelling, reinforcing rock slopes and shoring up excavation pits to the construction of intricately shaped components and sculptures. Starting in 1959, TORKRET began waterproofing tunnels, shafts and underground structures using fibre-reinforced sprayed concrete; natural stone masonry is deep-grouted using the TORKRET aero spraying method.

In 2004 TORKRET began experimenting with relief surfaces using the shotcrete method and in 2009 received the patent for its so-called TORKRET Relief® and the corresponding subcategories TORKRET Art and TORKRET Stone®. These processes are used to design optically and architecturally sophisticated surfaces. Profiled shotcrete has always been used as exposed concrete. TORKRET Relief® makes it possible to produce mechanically resilient surfaces with an artistic, three-dimensional look in a variety of colours.

TORKRET is also a pioneer in the use of textile-reinforced concrete. In 2006, the company carried out the world’s first extensive renovations using textile-reinforced fine concrete on a flat supporting structure. 2016 marked the first time that reinforced concrete columns were reinforced with textile-reinforced concrete. Textile-reinforced concrete combines the advantages of shotcrete (productivity, bonding strength, flexibility) with lightweight reinforcement that is not susceptible to corrosion.

TORKRET’s projects have always been varied and diverse. The restoration of the Mariendom pilgrimage church in Neviges, North Rhine-Westphalia, which TORKRET has been carrying out since July 2018, is a good example of the innovative and inquisitive spirit of the TORKRET team. 

Click here to find out more about this exciting project.

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Ed. Züblin AG

Stuttgart-based Ed. Züblin AG, with about 14,000 employees and an annual output of around € 4 billion, is one of Germany’s largest construction companies. Since its foundation in 1898, ZÜBLIN has been successfully realising challenging construction projects in Germany and abroad and today is the STRABAG Group’s leading brand for building construction and civil engineering. The company’s range of services covers all construction-related tasks – from complex turnkey construction, civil engineering and tunnelling to construction logistics, structural maintenance, ground engineering and timber or steel construction. In recent years, ZÜBLIN has been promoting the topics of digitalisation, LEAN.Construction and sustainability and – supported by the many years of experience of its Zentrale Technik competence centre – is also increasingly offering integrated design and construction from a single source as a general planner. When it comes to partnering, ZÜBLIN has set new standards with its TEAMCONCEPT® partnering model, which has proven its worth on the market for more than 25 years. Current construction projects of the company, a subsidiary of globally operating STRABAG SE, include the EDGE East Side Berlin high-rise project, the Rinsdorf and Rälsbach viaducts on the A45 motorway and the approx. 2 km long airport tunnel in Stuttgart. More information is available at www.zueblin.de.

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Images (9)

TORKRET Stone®
TORKRET Stone®
2 046 x 1 535 © Ed. Züblin AG
File size: 2,9 MB | .jpg
| | All sizes
TORKRET Stone®
TORKRET Stone®

TORKRET Stone® can be used to faithfully reproduce the brick and mortar pattern of traditional masonry. The brickwork look with different types of stone and stone formats as well as the multi-colouring through relief-like contrasting and imitation joints give buildings an individual touch.

© Ed. Züblin AG
TORKRET, renovation of the  Sarotti factory, Berlin 1922
TORKRET, renovation of the  Sarotti factory, Berlin 1922
2 710 x 3 608 © TORKRET GmbH
File size: 1,2 MB | .jpg
| | All sizes
TORKRET, renovation of the  Sarotti factory, Berlin 1922
TORKRET, renovation of the Sarotti factory, Berlin 1922

Renovation after fire: Not long after the company’s founding, TORKRET machines were already being used in several truly remarkable construction projects. In 1922, for example, TORKRET was hired to renovate the reinforced concrete structure of the Sarotti chocolate factory in Berlin, which had been severely damaged by a fire, restoring the building’s full load-bearing capacity

© TORKRET GmbH
TORKRET, Overhill climbing arch,  2009
TORKRET, Overhill climbing arch,  2009
3 072 x 2 304 © TORKRET GmbH
File size: 1,8 MB | .jpg
| | All sizes
TORKRET, Overhill climbing arch,  2009
TORKRET, Overhill climbing arch, 2009

Free forms: Shotcrete and reinforcing material are used not only to retrofit existing buildings but also to build new structures. Sprayed concrete is an alternative to regular concrete especially when free-form designs are desired, at least one shuttering can be omitted and great flexibility during installation is necessary. In 2009 the team from TORKET Berlin built the Overhill climbing arch with a triple bend and a crest height of 10.5 m.

© TORKRET GmbH
TORKRET, reinforcement of the shell structure at Schweinfurt University of Applied Sciences, 2006
TORKRET, reinforcement of the shell structure at Schweinfurt University of Applied Sciences, 2006
1 998 x 1 584 © TORKRET GmbH
File size: 797,7 KB | .jpg
| | All sizes
TORKRET, reinforcement of the shell structure at Schweinfurt University of Applied Sciences, 2006
TORKRET, reinforcement of the shell structure at Schweinfurt University of Applied Sciences, 2006

On the roof of the Schweinfurt University of Applied Sciences: reinforcement of a hyperbolic shell (2006) TORKRET became the first company in the world to employ textile-reinforced shotcrete technology for the reinforcement of a shell structure at the Schweinfurt University of Applied Sciences. The hyperbolic paraboloid roof of the university’s large lecture hall spans 38 m x 39 m. The thin shell is merely 8 cm thick at the centre. Serious deformations had occurred at the cantilevered high points between the columns.

© TORKRET GmbH
TORKRET, Façade renovation of the Lindner Congress Hotel, Düsseldorf, 2018
TORKRET, Façade renovation of the Lindner Congress Hotel, Düsseldorf, 2018
4 032 x 3 024 © TORKRET GmbH
File size: 3,5 MB | .jpg
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TORKRET, Façade renovation of the Lindner Congress Hotel, Düsseldorf, 2018
TORKRET, Façade renovation of the Lindner Congress Hotel, Düsseldorf, 2018

Façade renovation Lindner Congress Hotel, Düsseldorf: The repair, which was split into two phases, comprised exposed concrete exterior surfaces, balcony and façade elements, and the front-facing supply tower with a total surface area of 8,000 m². TORKRET removed local concrete and corrosion damage and coated the exposed prefabricated concrete elements for lasting surface protection while the hotel was in full operation. Work on the outside of the balcony parapets was only possible using suspended scaffolding. The workflow was coordinated with the hotel management in such a way that the labour-intensive work on the scaffolding could be reduced to a minimum

© TORKRET GmbH
TORKRET, repair of the U5U8 connecting tunnel, Berlin, 201617
TORKRET, repair of the U5U8 connecting tunnel, Berlin, 201617
3 264 x 2 448 © TORKRET GmbH
File size: 1,9 MB | .jpg
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TORKRET, repair of the U5U8 connecting tunnel, Berlin, 201617
TORKRET, repair of the U5/U8 connecting tunnel, Berlin, 2016/17

Repair of U5 / U8 connecting tunnel, Littenstraße Berlin (2016/17) TORKRET fully renovated the so-called Waisentunnel, a single-track metro tunnel in Berlin underneath the river Spree, in order to maintain the structure’s load-bearing capacity, serviceability and train safety for the long term. The restoration works covered several vaulted ceilings (856 m²), tunnel walls (427 m²) and a total of 21 cross girders. The work was carried out on interior scaffolding, with limited working height, using the back step method under full closure of the metro line.

© TORKRET GmbH
TORKRET Relief®
TORKRET Relief®
2 717 x 2 037 © TORKRET GmbH
File size: 3,9 MB | .jpg
| | All sizes
TORKRET Relief®
TORKRET Relief®

ceative concrete surfaces with TORKRET Relief®: The TORKRET shotcreting process can be used not only to reinforce and repair but also opens up new possibilities for designing unusual concrete surfaces. These are created through custom moulds that are tacked to the fresh shotcrete layer before and removed after the final round of spraying with TORKRET Relief® concrete mixture. There are no limits to creativity: lettering, abstract images or realistic representations can be permanently reproduced in a three-dimensional look in any colour and in different grain sizes

© TORKRET GmbH
TORKRET, repair works, Hercules statue, Kassel
TORKRET, repair works, Hercules statue, Kassel
2 302 x 2 781 © TORKRET GmbH
File size: 1,1 MB | .jpg
| | All sizes
TORKRET, repair works, Hercules statue, Kassel
TORKRET, repair works, Hercules statue, Kassel

A better “footing” for Hercules (1934 and 2007) The Hercules statue in Kassel has been standing on shaky legs ever since its completion in 1717. This is due to the unfavourable ground conditions at the site as well as the tuff that was used for the monument’s construction – the engineers at the time had completely overestimated the compressive strength and frost resistance of this type of rock. TORKRET carried out the first repair works in 1934, replacing individual stones and filling the resulting cavities with a total of 2,000 m³ of mortar. In 2007 the TORKRET team was back to reinforce the monument walls, among other things, using approx. 250 m of tension anchors and more than 500 needle anchors.

© TORKRET GmbH
TORKRET
TORKRET
2 953 x 1 971 © Ed. Züblin AG
File size: 1 MB | .jpg
| | All sizes
TORKRET
TORKRET

TORKRET specialises in the demanding repair and renovation of buildings.

© Ed. Züblin AG
more ...

Contact

(01) Birgit Kümmel (englisch)
Birgit Kümmel
Head of Corporate Communications Germany/Benelux/Northern Europe
presse@strabag.com
+49 221 824-2472

(02) Sabine Appel (englisch)
Sabine Appel
PR-Manager
Corporate Communications
sabine.appel@strabag.com
+49 221 824-2159
TORKRET, Overhill climbing arch,  2009

TORKRET, Overhill climbing arch, 2009 (. jpg )

Free forms: Shotcrete and reinforcing material are used not only to retrofit existing buildings but also to build new structures. Sprayed concrete is an alternative to regular concrete especially when free-form designs are desired, at least one shuttering can be omitted and great flexibility during installation is necessary. In 2009 the team from TORKET Berlin built the Overhill climbing arch with a triple bend and a crest height of 10.5 m.

© TORKRET GmbH
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TORKRET Stone®
TORKRET Stone®
2,9 MB .jpg © Ed. Züblin AG
TORKRET, renovation of the  Sarotti factory, Berlin 1922
TORKRET, renovation of the Sarotti factory, Berlin 1922
1,2 MB .jpg © TORKRET GmbH
TORKRET, reinforcement of the shell structure at Schweinfurt University of Applied Sciences, 2006
TORKRET, reinforcement of the shell structure at Schweinfurt University of Applied Sciences, 2006
797,7 KB .jpg © TORKRET GmbH
TORKRET, Façade renovation of the Lindner Congress Hotel, Düsseldorf, 2018
TORKRET, Façade renovation of the Lindner Congress Hotel, Düsseldorf, 2018
3,5 MB .jpg © TORKRET GmbH
TORKRET, repair of the U5U8 connecting tunnel, Berlin, 201617
TORKRET, repair of the U5/U8 connecting tunnel, Berlin, 2016/17
1,9 MB .jpg © TORKRET GmbH
TORKRET Relief®
TORKRET Relief®
3,9 MB .jpg © TORKRET GmbH
TORKRET, repair works, Hercules statue, Kassel
TORKRET, repair works, Hercules statue, Kassel
1,1 MB .jpg © TORKRET GmbH
TORKRET
TORKRET
1 MB .jpg © Ed. Züblin AG

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