Hauptbeiträge | Main Articles

Boßler Tunnel: Influence of Rock Mechanics on the Tunneling Concept – Tendering and Execution

Using the example of the Boßler Tunnel, the importance of careful rock mechanical investigations for the excavation concept of a tunnel is shown. The preliminary exploration revealed that squeezing rock conditions were to be expected in the middle section of the tunnel. In another tunnel section, karstification had to be expected. Towards this background, the tunnel was tendered for construction with conventional means (“shotcrete method”). Along the first 2.8 km, the use of a TBM was permitted. By driving an exploration shaft and gallery combined with accompanying rock mechanical investigations and numerical calculations, it was possible to create the basis for allowing for a TBM-excavation in the entire formation of the Brown Jurassic. In addition, the program for karst exploration was adapted to the requirements of a TBM heading.

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Hauptbeiträge | Main Articles

Eppenberg Tunnel: Soft Ground Drive and Inner Lining

On the Berne-Olten-Zurich railway line in Switzerland, the stretch between Gretzenbach and Wöschnau, which is the sole remaining twin-track section, forms a bottleneck. This situation is to be rectified by late 2020 by widening the line between Olten and Aarau to provide four tracks. This upgrade will increase the route’s availability and capacity as well as it will attain more flexibility. We reported on the 3.1 km long Eppenberg Tunnel in issue 8/2017 of tunnel. This article thus merely provides a brief summary of the overall project and concentrates on the findings obtained from the construction sections already completed as well as the current status.

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Hauptbeiträge | Main Articles

Monitoring the Infrastructure while Working under Railway Tracks

Special regulations have to be observed with regard to safe railway operation while carrying out work such as pipe-jacking or tunnelling under railway tracks. Towards this end, what is known as safetoring must be undertaken by means of a suitable measuring system and method. Safetoring is (deformation) monitoring with directly coupled measurement data evaluation so that the existing track position and the availability of the infrastructure can be assessed at any time, thus enabling direct intervention in the railway and construction activities should the limit or alarm values be exceeded.

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Interview Interview

Prof. Jenny Yan about Tunnelling in China

Professor Jinxiu (Jenny) Yan is currently the vice president of the ITA, vice president of the Chinese Tunnelling and Underground Works Society of CCES and deputy general manager of China Railway...

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Brandschutz | Fire Protection

Smoke Clearance from Underground Transport Stations

In the event of a fire in an underground transport station, smoke gas flows are mostly cleared to ground level through the entrances and exits. This not only pollutes the escape and rescue routes inside the station with smoke gases but also the assembly places above ground, surrounding buildings and potential working areas for the emergency services. In the Orpheus research project, possibilities have been investigated of minimising the pollution above ground through the layout of the exits and an intentional control of the smoke gases.

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Nachrichten | News Norway | Norwegen

Final double Breakthrough Follo Line

The final double breakthrough of the two Herrenknecht tunnel boring machines „Anna“ and „Magda“ (Double Shield TBM, Ø 9,900 mm) in the Norwegian Ski completed the excavation of both 20-kilometer-long...

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Nachrichten | News China/Germany/France

Strategic Partnership between CREG & Metalliance

In February 2019 the China Railway Engineering Equipment Group (CREG) and French multi-service vehicle (MSV) manufacturer Metalliance have announced a strategic partnership comprising a cooperation in...

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Produkte | Products TPH Bausysteme/Germany

First Crack Filler with DIBt Certificate

The German DIBt (technical institute serving the construction sector) has awarded TPH’s Rubbertite acrylate gel its certificate for complying with stability requirements on structural facilities in accordance with MVV TB, A 1.2.3.2 (DAfStb Guideline for the Repair of Concrete Components – October 2001) as one of the first repair products for concrete parts.

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Nachrichten | News Switzerland

4–6 June: Swiss Tunnel Congress 2019

The Swiss Tunnelling Society will stage the Swiss Tunnel Congress (STC) for the 18th time this year. From June 4 to 6, 2019, the STC will be held in Lucerne’s Culture and Convention Centre (KKL) in...

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