Schruns, Austria
Schruns, Austria

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Barwart C.,Viglconsult ZT | Romualdi P.,L.E.S.S. | Barioffi A.,L.E.S.S.
Geomechanik und Tunnelbau | Year: 2013

The 3.3 km long headrace tunnel (Lot 2) of El Alto hydropower project in Panama has been tendered as drill and blast excavation. Lot 2 has been arwaded to SELI, Rome /Italy. By using an EPB TBM for tunnel excavation general alignment of tunnel has to be redesigned completely. General and detailed design has been done by viglconsult ZT/Schruns. Internal pressure conditions does allow to use segmetnal ining as final lining most of the tunnel length. Only the last 300m of tunnel does have the requirement of inner lining made of steel. Traditional bar reinforcement has been substitued with steel fibre reinforcement with ductile post crack behaviour. A three-step grouting programm is foreseen to gain segment stability and is responsible for sealing of the headrace tunnel. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

As result of the two-year route selection process, the southernmost variant Pfaffensattel was chosen in April 2008 as the best variant for the New Semmering Base Tunnel, which run from Gloggnitz to the Mürzzuschlag-Langenwang area, and the route has since been optimised for design through a detailed programme of investigations. As a result of this, the final route of the tunnel was fixed in autumn 2009. All design work for the partially concentrated approvals process are now based on this route. This article is concerned with the essential technical tunnel construction aspects of the design to be handed in for approval, above all the construction concept and the procedure for geotechnical design to be used as a basis. At the time of writing this article, the final evaluation of the geomechanical and hydrogeological investigations and the geotechnical design are still underway. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.

Ekici Z.,IGT consulting engineers | Ruegg C.,Amberg Engineering AG | Wilfinger N.,viglconsult ZT | Wagner O.K.,OBB Infrastruktur AG | Weigl J.,iC consulenten ZT GesmbH
Geomechanik und Tunnelbau | Year: 2011

The approved alignment of the "New Semmering Base Tunnel" was divided into sections according to the three aspects risk, geotechnics and construction operations, in which either only sequential tunnelling or both methods, sequential or continuous mechanised, could be used. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.

Bach D.,IGT ZT GmbH | Hodl R.,OBB Infrastruktur AG | Lemmerer J.,OBB Infrastruktur AG | Vigl A.,Viglconsult ZT
Geomechanik und Tunnelbau | Year: 2011

The Pummersdorf Tunnel is part of the works to close the gap between St. Pölten and Loosdorf and is planned as a single-bore, two-track tunnel about 3.5 km long. Before the start of the design work leading to handing the project in for approval, a risk analysis was carried out regarding suitable tunnelling methods, with four variants being compared. As a result of this risk analysis, taking the current market conditions into account, a decision was made to submit two methods of tunnelling to free market competition: • Variant A: Sequential advance with two lining layers (with relief of water pressure), • Variant B: Continuous advance with an EPB shield with singlelayer segment lining (resistant to water pressure). This article describes the project as affected by the geotechnical, hydrogeological and environmental constraints as well as the specific sensitive aspects on this project. It describes the decision- making process, which led to the selection of the two tendered variants, and briefly describes the tendered variants. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.

Strappler G.,OBB Infrastruktur AG | Vigl A.,Viglconsult ZT | Scheutz R.,OBB Infrastruktur AG
Geomechanik und Tunnelbau | Year: 2012

In the last 15 years, a number of transport tunnels for Austrian Railways ÖBB have been tendered for mechanised tunnelling by TBM and some have already been completed. The question whether to use one or two layers of lining was considered on practically all these projects. This either led to a decision which system to tender, or else the two alternatives were held to be equally suitable and the decision was left to market forces. These fundamental considerations about the lining system normally involved a systematic comparison and evaluation of the features of each system regarding the structural system (actions and resistance), serviceability (waterproofing, durability), the properties during and after a fire and operational and maintenance considerations. The article explains: -the essential system requirements concerning actions and resistance, serviceability and fire safety, with examples, - the basic requirements for the operation and maintenance of ÖBB tunnels, including discussion of previous experience with maintenance, - the basic features of single- or two-layer construction for continuously advanced tunnels, which are presented and briefly described, - the system matrix used to make system decisions and the evaluation procedure, - the economic considerations, mentioning the contrasting conditions in neighbouring European countries, including construction price and time considerations. The system decisions or recommendations are analysed and argued through the example of rail tunnels in Germany and Switzerland as well as ÖBB tunnel projects. This overall treatment is intended to clarify how system decisions or recommendations were reached on ÖBB projects and what assistance can be derived for future projects, also considering foreseeable technical developments. © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

In pressure tunnel construction, the crack water table plays a varied role, often important and decisive with regard to technology, safety, cost-effectiveness and environmental relevance. This paper is concerned with the crack water table and its natural range of fluctuation, with the relaxation of crack water pressure due to tunnelling, the interaction between internal tunnel pressure and crack water as it affects lining and waterproofing and the influence of the crack water by the operation of the tunnel. © 2010 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co.KG, Berlin.

Pressure shafts, due to their complexity and length, are one of the most challenging parts of the headrace system of a high head hydropower plant. Pressure shafts offer great potential for optimisation and this has to be reflected in their design and construction. The article first describes most common system concepts for headrace systems. Then it introduces the graphical-analytical design method from Seeber in its main features and uses this as a basis for understanding the mode of action of common lining systems. Finally, the common mechanised heading methods are briefly discussed in terms of their areas of application depending on the expected ground behaviour with a qualitative risk assessment of their feasibility. © 2015 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Gehwolf P.,University of Leoben | Walter A.,viglconsult ZT | Galler R.,University of Leoben | Wagner H.,OBB Infrastruktur Bau AG
Geomechanik und Tunnelbau | Year: 2016

For the driving of cross passages in mechanized tunnelling, different systems can be used for load transfer at the cross passage opening. With thin segmental linings, achieving high load-bearing capacity of the precast lining and the load transfer elements used pose a great challenge. For the selection of a system, not only the required support measures but also practical construction aspects such as the integration of the load transfer elements into the precast element and the installation of the elements play an important role. The use of shear dowels as a connection and load transfer element between segment rings in the cross passageoffers new possibilities in mechanized tunnelling. Particularly in connection with thin segmental linings, flexible systems of plastic with integrated steel core make it possible to resist loads with large deformations, both in the radial and longitudinal directions. In order to investigate the system behaviour of the overall system of segmental lining with thin construction and plastic shear dowels, shear tests were performed at the Chair for Subsurface Engineering of the Montanuniversität Leoben with a dowel system as the connecting element between segments. The objective of the research project initiated by the ÖBB-Infrastruktur AG is to determine the effects of different reinforcement concepts on the load-bearing capacity of the connection system. Ways of determining the failure of the construction element based on crack detection are also described. Für das Anfahren von Querschlägen im maschinellen Tunnelbau kommen unterschiedliche Systeme für die Lastabtragung im Bereich der Querschlagsöffnung zum Einsatz. Bei schlanken Tübbingauskleidungen stellt das Erzielen einer hohen Lastkapazität der Fertigteilauskleidung sowie der eingesetzten Lastabtragungselemente eine hohe Herausforderung dar. Bei der Auswahl der Systeme spielen neben den erforderlichen Sicherungsmaßnahmen die baupraktischen Aspekte wie das Integrieren der Lastabtragungselemente in das Fertigteilsegment und die Installation der Elemente eine wesentliche Rolle. Durch Verwendung von Scherdübeln als Verbindung- und Lastübertragungselement zwischen Tübbingringen im Querschlagsbereich ergeben sich neue Möglichkeiten im maschinellen Tunnelvortrieb. Insbesondere im Zusammenhang mit schlanken Tübbingauskleidungen bieten flexible Systeme aus Kunststoff mit integriertem Stahlkern die Möglichkeit, Lasten mit großen Verformungen sowohl in Radial- als auch in Längsrichtung zu übertragen. Um das Systemverhalten des Gesamtsystems zwischen Tübbingauskleidung mit schlanker Bauteildicke und Kunststoffscherdübel zu untersuchen, wurden am Lehrstuhl für Subsurface Engineering der Montanuniversität Leoben Scherversuche mit einem Dübelsystem als Verbindungselement von Tübbingen durchgeführt. Ziel des von der ÖBB-Infrastruktur AG initiierten Forschungsprojekts ist es, die Auswirkungen unterschiedlicher Bewehrungskonzepte auf die Tragfähigkeit des Verbindungssystems zu bestimmen. Ergänzend werden Möglichkeiten zur Bestimmung des Bauteilversagens auf Basis der Risserkennung aufgezeigt. © 2016 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin

Gerstner R.,Vorarlberger Illwerke AG | Netzer E.,Vorarlberger Illwerke AG | Vigl A.,Viglconsult ZT
Geomechanik und Tunnelbau | Year: 2013

The pressure tunnels of Alpine hydropower stations have been designed for a long lifetime and often give good service for long periods, making no further measures necessary except for regular maintenance. But in some pressure tunnels, damage to the lining has been discovered after some decades of use and this leads to repair works of varying extent. The article gives an overview of the damage patterns and the repairs, with serveral examples. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

The Kopswerk II power plant of the Vorarlberger Illwerke AG with a capacity of 510 MW was constructed between 2004 and 2008 as a pumped storage scheme parallel to the existing Kopswerk I (247 MW) constructed in 1969. The design of the headrace was confronted with borderline conditions concerning both construction and operation. The construction concept had to take into consideration the external constraints and ensure continuous construction in winter in the high mountains. On account of the formation water situation, the intention was to relieve formation water pressure during the construction period. In operation, the components of the headrace system including pressure tunnel are subject to enormous internal pressure fluctuations within a very short time on account of the pumped storage peak flow operation of Kopswerk II. In addition, the external formation water pressure can reach a head of 450 m, which could scarcely be resisted with an economic lining alone. This resulted in a basic design concept to integrate the surrounding rock mass into the structural system as far as possible, both with regard to rock pressure and formation water pressure. Such a concept has to include systematic and differentiated grouting of the rock mass, which is not always simple to achieve under high formation water pressure. © 2011 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

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