Porr Tunnelbau GmbH

Vienna, Austria

Porr Tunnelbau GmbH

Vienna, Austria
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The article explains the interaction of the overall system of ground, TBM and segment lining based on recent experience of projects using TBMs with active face support in Austria and abroad. The alternating dependencies and their consequences for tunnel construction are discussed in more detail. Of particular interest is the influence of the support medium and how it functions at the face and the tunnel side walls. The interaction of support pressure, thrust force and the centre of gravity of the TBM and its effect on steering behaviour are also considered. The effects of the compression of the segment tube by the TBM (prestress) are considered in relation to the improvement of the bedding and the problem of floating. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Lauffer H.,Porr Tunnelbau GmbH
Geomechanik und Tunnelbau | Year: 2010

The NATM is essentially a way of thinking rather than a construction method; we could also say a school of tunnelling. Understanding of the NATM depends on the era, local preferences and traditions and also on the particular interpretation by the responsible person. Accordingly, national versions of the NATM or similar tunnelling methods have been developed all over the world. The main theme of the NATM is the use of the load-bearing capacity of the rock mass and the control of support measures based on the interpretation of observations and measurements. This adaptability of the tunnelling method to the conditions observed is typical for the NATM and requires a correspondingly adaptable construction contract with clear assignment of risk. The development of the NATM has been decisively influenced by the improvements in shotcrete technology and the use of new support measures like rock bolts, pipe umbrellas and yielding elements. Three-dimensional measurement of the deformation of the cavity today enables comprehensible control of NATM drives. The introduction of the ÖGG guideline for the geotechnical design of underground structures by cyclical construction in 2001 provided a regulation for the comprehensible engineering design and construction of underground structures. The conditions of contract for underground construction B2203-1978 already contained provisions for the agreement of "rock quality classes" between the client and the contractor. The B2203-1994 introduced the model of a tunnelling matrix. This provides an unambiguous and transparent basis for estimation and invoicing. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Schubert W.,University of Graz | Lauffer H.,Porr Tunnelbau GmbH
Geomechanik und Tunnelbau | Year: 2012

The term NATM was introduced by Rabcewicz during a lecture at the Geomechanics Colloquium in 1962 [1]. In this lecture, he summarizes the development of tunnelling methods and insight into mechanical processes in the ground over the last decades, and points out the positive experience made with a combination of shotcrete and rock bolts instead of the traditional timber or steel supports. Building on experience and development around the world, it has been Austrian engineers who have systematically developed and applied the method. In the beginning technological questions played a major role, but it was also clear that traditional design methods were no longer applicable. Thus it was still unavoidable to rely heavily on experience and observation. The importance of measurements for observing the system behaviour has been acknowledged, and techniques have been developed considerably further since then. Parallel to gaining more experience with the method in all kinds of ground conditions, contractual practices have also been further developed with the aim of establishing rules, which allow fair compensation of the contractor in spite of all the inherent uncertainties. In Austria, tunnel design practice has been standardized by the introduction of a guideline. Some of the factors contributing to the success of the method are the awareness of the client of his responsibilities, appropriate site organization, qualified engineers and miners, practically oriented research and education, as well as extensive exchange of experience. © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Kohler H.,Porr Tunnelbau GmbH
Proceedings - Rapid Excavation and Tunneling Conference | Year: 2011

The Wienerwald Tunnel is part of the new railway route between Vienna and St. Pölten, currently Austria's largest tunnel project. By 2012, this new rail link will reduce travel time between Vienna and St. Pölten from 40 to 25 minutes. The technical challenges of the project include conventional tunneling in large cross sections on a length of 2,35 km, as well as the use of two tunnel boring machines with a diameter of 10,68 m on a length of 10,7 km each. Challenging geological conditions call for experienced tunneling crews and immediate reaction to actual conditions. On site segment casting and hauling of large material quantities over major distances need sophisticated logistics.

The construction of the City Tunnel in Waidhofen an der Ybbs required not only the solution of problems specific to an inner-city infrastructure project but also flexible adaptation to the difficult geological conditions. This article intends to use the example to describe the construction of a structure in a creeping slope, to explain the considerable technical challenges and describe the chosen solution. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.

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