Two acrylate gels by TPH Bausysteme, adapted to the properties of the respective ground areas, were used for the rammed spile pre-support in the NATM excavation section of the Bavarian road tunnel...
Robbins’ latest innovation is making good headway on a non-circular tunnel excavation in hard rock. The rectangular TBM, known as the MDM5000 (standing for Mine Development Machine with dimensions of...
The research facilities of the European Organisation for Nuclear Research, CERN, currently extend at the foot of Lake Geneva on Swiss and French territory. With a length of 27 km, CERN operates the...
On 31 July 2021, Roy Forbes, long-time translator of the trade journal tunnel, died – after a long illness, but nevertheless surprisingly. He never ceased to be enthusiastic about the many different subject areas of tunnelling, and even at the age of 78, forced to take a break from work due to illness, he was looking forward to “translating for tunnel again soon”. The tunnel staff mourns the loss of a colleague from the very beginning. A decades-long excellent cooperation connects us with Roy Forbes. Excellent because it was not only professionally successful but also fun for all of us. We miss him very much.
To realize the integrated synchronized timetables in long-distance traffic and to increase the capacity in freight traffic between Brig and Bern, the two-lane extension of the Lötschberg Base Tunnel (LBT) is necessary. This demands the installation of an inner lining over 14 km in the second LBT tube. Considering the excavation profile available, a skillful choice in the sequence of formwork carriage geometries (FCGs) can lead to optimization of the concrete volume to be installed, the feasibility of the build and the construction sequences. In the sense of a “proof of concept”, mathematical optimization algorithms are used to find a cost-optimal sequence of FCGs for a defined tunnel section. The article in tunnel 5/2021 describes the chosen approach and the results of the cost optimization.
The patented EK series chain cutters with their rotating chain between the two lateral cutter drums are a core product of Kemroc. But the German specialist manufacturer has massively expanded its...
Excavator-mounted cutting attachments have become established in tunnel projects of the Austrian construction group Porr and in other construction companies. The wide range of applications is carried out with both standard and special cutters. In some cases, even excavation of the tunnel is carried out using cutting technology. In soft rock, this offers an advantage over blasting, because the bedrock is not damaged by vibrations. Moreover, numerous other operations in tunnel construction and rehabilitation are made possible by excavator-mounted cutting attachments.
This article presents a three-staged exploration algorithm for mechanized tunnelling, which combines two different techniques. Firstly, a supervised machine learning methodology utilizes common...
Sprayed concrete construction in double-shell lining is a CO2-intensive construction method for tunnel structures. This article explains the ecological impact of concrete in underground construction and provides options for using this material responsibly and in a climate-friendly way – particularly in terms of planning and concrete technology.
The Vötting road tunnel will help relieve traffic congestion in the municipality of Freising in Bavaria from the end of 2021. Its construction was challenging but could be completed safely and...
The STUVA conference with accompanying trade exhibition STUVA-Expo is to be held as a face-to-face event in the usual manner from 24 to 26 November 2021 at Messe Karlsruhe. The event is considered the...
