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Copyright of BHM Berg- und Hüttenmännische Monatshefte is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

After a long planning and approval phase, the main construction work on the A26 Linz motorway began at the beginning of 2019. The new A26 road section, large parts of which are underground, will not only significantly relieve the existing inner‐city traffic routes around Linz, but will also provide an additional Danube crossing in the form of a suspension bridge with a span of over 300 m. The main elements of the first Phase of construction are the Danube Bridge and two underground branches, north and south of the Danube, with excavated cross‐sections of up to 400 m2 and ramp tunnels with tight curves. The planning of an inner‐city construction project requires the comprehensive and careful consideration of the protection of the local residents with regard to the effects of noise and vibration. It also needs the impact of the construction work on the existing traffic routes to be reduced as much as possible. The material excavated from the Freinberg tunnel and the Danube South junction must be transported away via the Danube waterway. The project‐specific framework conditions, such as the very high number of tunnel portals, the sound reflections within the Danube valley and the low overburden require considerable measures to reduce their impact during the construction phase. [ABSTRACT FROM AUTHOR]

The small town of Weyer is located in Upper Austria on the B121 Weyerer Straße. The B121 leads through the historic market square of Weyer, which is characterised by confusing bottlenecks that can only be passed in one lane. For decades, these bottlenecks have caused congestion, mainly due to heavy traffic. For residents, the burden of air pollution and noise is high. The roads department of the Upper Austrian Government has been planning the construction of a bypass for many years. Construction finally started in the summer of 2022. The Weyer bypass construction lot is 1.2 km long and includes the construction of two NATM tunnels, a vertical escape shaft, a bridge over the river Dürnbach, two roundabouts, and one traffic junction. The tunnel construction works are carried out in urban areas, in loose material with little overburden and partly under existing buildings. These boundary conditions make the project a challenge for all involved at every stage. [ABSTRACT FROM AUTHOR]

Copyright of BHM Berg- und Hüttenmännische Monatshefte is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of BHM Berg- und Hüttenmännische Monatshefte is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Abstract: Tunnelling in Scandinavia differs in several ways from the methods used in Central Europe. Porr Bau GmbH has been working since the end of 2016 with the subsidiary PNC on the first tunnelling project for the company in Norway. The project Fv.17 is located in Nordland, 10 km south of the Arctic Circle. The narrow coastal road is to be upgraded with two new tunnels. The Norwegian fjords are well known as vacation destinations and for their nature, but building tunnels in this environment is challenging, and the rock conditions are also demanding. The rock types described in the tender changed, leading to high water inflow. Systematic rock grouting needed to be carried out to finish the tunnel drive. [ABSTRACT FROM AUTHOR]