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Stuttgart Mühlhausen, Germany

Gamsjager H.,Zublin AG | Atzl G.,IC consulenten Ziviltechniker Gesmbh
Geomechanik und Tunnelbau | Year: 2012

Contract B-9528 - Södermalm Tunnel is a good example of urban tunnelling, where tunnel alignments cannot be chosen freely due to existing buildings and subsurface structures. Around ten tunnel crossings and a number of difficult situations underpassing existing buildings were in the scope of Södermalm Tunnel with the main focus on the Maria Magdalena Church. A NATM approach enabled tunnelling of the first double track tunnel in Stockholm's Esker to succeed in very close vicinity of the church. © 2012 Ernst & Sohn Verlag f?r Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

From the field of drinking water abstraction, the iron hydroxide deposition in groundwater wells is known. Building on this idea, the company Züblin is working with mechanical, chemical and biological processes to develop a similar blocking method and to reach a reduction of groundwater flow at leakage points of dikes or similar. The major advantage of the method is that an accurate localization of the leak is not necessary. The BioSealing works with the natural flow of groundwater, the grout is transported to the leaks, where it leads to the initiation of a biological process. This process creates a sealing and causes a reduction of seepage.

Franzius J.N.,Zublin AG | Pralle N.,Zublin AG
Proceedings of the Institution of Civil Engineers: Civil Engineering | Year: 2011

Geothermal energy is a universal low-grade renewable energy source and can be built into any engineering structures that provide large interface areas with the ground. There are already a number of case studies on retrieving geothermal energy from tunnels lined with sprayed concrete, but this paper presents a new system for segmental tunnel linings. Following a field trial in Germany it has been successfully installed in a new high-speed railway tunnel in Austria to supply a municipal building with heating energy. The paper demonstrates how subsurface urban structures can contribute both to sustainable city planning and the provision of decentralised renewable energy.

Urban S.,Zublin AG | Strauss A.,University of Jordan | Schutz R.,University of Jordan | Bergmeister K.,University of Jordan | Dehlinger C.,Zublin AG
Structural Concrete | Year: 2014

When it comes to dynamically loaded concrete structures, determining the real degree of fatigue damage of a structure on site is a very demanding process that has not been explored in depth. Calculation concepts according to current codes and specifications (e.g. fib Model Code for Concrete Structures 2010 [1]) do not offer efficient results for this task. However, the permanent monitoring from the erection of a structure up to the end of its lifetime is seen as a very promising possibility for assessing the degree of damage constantly. This article takes a closer look at the concrete fatigue concept of fib Model Code 2010 [1], shows an FE simulation of a time-dependent fatigue process for an offshore wind turbine foundation and presents a fatigue monitoring concept including laboratory tests, which enables the detection of the real degree of deterioration in a concrete structure. During tests, the use of ultrasound was identified as the most appropriate method. Measuring wave velocity enables the determination of the dynamic E-modulus, which correlates to the degree of damage within the cross-section of the structure considered. Copyright © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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