In April 2026, a consortium comprising Hochtief CZ, Hochtief Infrastructure, Subterra, and BeMo Tunneling was awarded the contract for the next construction phase of Prague’s Metro Line D. Delivered...
The R 930 Tunnel crawler excavator was developed at Liebherr-France SAS in Colmar (France). The R 930 Tunnel model is the successor to the R 924 Compact Tunnel and delivers increased performance for...
The Holzminde is a small river that flows through the center of the town of Holzminden in southern Lower Saxony, Germany. The town’s proximity to the “red water”, as the Holzminde is popularly referred to, has shaped its development over the centuries – and in 1904, one section of the river was diverted into a tunnel structure. This made it possible to create enough space for new traffic routes in the town center. The result was the construction of what is now the state highway L550. More than a century later, the historic tunnel is once again the focus of an important infrastructure project: over the years, time had left its mark.
The central access structure to the new Marienhof Station on the 2nd S-Bahn Main Line is being built using the diaphragm wall/top-down construction method. With five bracing levels and a depth of 42 m, this will be the deepest excavation pit in the centre of Munich. From the excavation pit at Marienhof, the platform tubes of the station and a connecting tunnel to the existing U3/U6 underground railway line are being driven under compressed air. To secure the buildings and to mitigate possible settlements, the buildings and the existing tunnels above the platform tubes to be constructed, are bolstered with a compensation grouting screen.
Conventional project delivery models with unit or lump sum remuneration regularly reach their limits, especially in large-scale projects. There are many reasons for this. Integrated Project Delivery (IPD) offers a practical, cooperative approach here. Particularly for tunnel construction, with its geological uncertainties, long tunnel drives and safety-critical conditions, partnership-based project management can improve cost and schedule reliability and avoid claims and interface conflicts. At the same time, a solution-oriented project culture is promoted through the timely involvement of all parties. This article marks the start of a series of publications on IPD and presents the basic principles of IPD and current IPD tunnel construction projects in Austria and Germany.
In January 2026, the new collaborative research project EINFACH (German acronym for „Single-shell tunnel construction using CO2-optimised fibre-reinforced sprayed concretes – rethinking tunnel shells...
One of Martin Herrenknecht’s earliest insights into mechanized tunnelling still drives him today: “There’s a better way.” This insight originally referred to a tunnel boring machine from an American...
The special vessel that will be used to lower the tunnel segments for the Fehmarnbelt Tunnel is currently undergoing final tests at the working harbour near Rødbyhavn ahead of certification by the...
On 8 and 9 June 2026, the specialist colloquium “Advanced Drilling Technologies and Subsurface Engineering” will take place as part of the 77th BHT – Freiberg University Forum in Germany. The...
DB Projekt Stuttgart–Ulm GmbH (PSU) has a new CEO as of March 1, 2026: Klaus Müller succeeds Olaf Drescher, who is retiring. Klaus Müller has been a member of the PSU executive board since the...
