An 8 m diameter Main Beam TBM broke through at China’s Yin Han Ji Wei project in the first quarter of 2022. The project is considered to be one of the most challenging ever completed by a TBM, with crews encountering abrasive hard rock, over 14 000 rock bursts, and multiple severe water inflow events. The machine overcame 17.5 km of tunnel in some of the most difficult geology ever encountered. The water diversion tunnel traverses the Qinling Mountains of Shaanxi Province, with up to 2000 m of cover.
For the construction of inner tunnel linings exposed to water pressure, both constructions made of waterimpermeable concrete and waterproofing with plastic sealing membranes are used. Both sealing options have in common that hose lines are led through the inner tunnel shell along a tunnel block. The article published in tunnel 3/22 examines the question of the extent to which water can flow along the longitudinal direction of the hose lines as a construction-related effect.
The extension of the U5 urban railway line in Frankfurt a.M. will connect the Europaviertel to the city‘s underground network. The ARGE U5 Europaviertel, consisting of the Porr teams of civil...
Climate protection and the geopolitical situation pose major challenges for our society. To protect the climate, we must reduce CO2 emissions and cut the consumption of fossil energies. The war in Ukraine makes us very aware of our economy‘s dependence on fossil energies and their availability and costs. This makes savings even more urgent than they already have been before. Likewise, the relevance of supply chains and availability of raw materials is becoming more and more obvious – also for the construction industry. An optimization of the design of conventional tunnels by owners and planners can lead to a significant reduction in CO2 emissions, energy and raw material requirements, and thus also in cost. In the article, potential optimizations are shown and explained with the help of examples.
On 1 February 2022, Prof. Dr.-Ing. h. c. Robert Fechtig passed away at the age of 91. With him, STUVA not only loses a highly esteemed colleague in the field of underground construction, but also a...
Amberg has been offering expertise in the entire cycle of planning, construction and maintenance of infrastructures for over 50 years. In a more and more urbanized world, the Amberg Group contributes...
Tradition and innovation, that does not have to be a contradiction, as the family-owned company Desoi from Hesse (Germany) shows. True to the spirit of Charles Darwi, that only those advance who move with the times and adapt as necessary, the specialist for injection technology has set itself the task of simplifying work on the construction site with modern means. With the Desoi w.i.l.m.a. recording and documentation device, the integration of mechanics and state-of-the-art electronics has enabled the leap into Industry 4.0.
On March 3, 2022, a 7.95 m diameter Robbins Single Shield TBM completed boring at the Ashbridges Bay Outfall Tunnel in Toronto, Ontario. The machine launched in March 2021 from an 85 m deep, 16 m...
Porr Romania was commissioned by the state road com pany CNAIR to design and build the Sibiu–Pites¸ti motorway, section 4 (Tigveni–Curtea de Arges¸). This 9.86 km long section includes a 1.35 km long...
The 880 m long Brandberg Tunnel near Winden in Elztal (Baden-Württemberg, Germany) is part of the B294 bypass, which is scheduled for completion by 2024. In the course of excavation work on the...
