The excavation work under the top cover at Marienhof marked a further milestone in the large-scale construction project for Munich’s second core S-Bahn route. As part of the engineering consortium “INGE BÜW VE99”, the BERNARD Gruppe was commissioned with local site supervision.

Munich’s second core S-Bahn route is the basic prerequisite for the introduction of a 15-minute frequency on all S-Bahn lines with additional express S-Bahn lines at 30-minute intervals. In the event of an operational disruption on the existing core railroad line, which is the busiest in Germany, the second core route can partially accommodate the traffic. The commuter trains arriving from the outer branches of the S-Bahn network will then be routed via Munich’s second core S-Bahn route.

By the end of 2021, the concrete deck covering the diaphragm wall frame was completed.

Extensive targeted groundwater lowering is also required to construct the central access structure under the protection of the diaphragm wall. For this purpose, about 80 wells and gauges were constructed both inside and outside the diaphragm wall. The first wells were put into operation at the beginning of 2022.

On January 31, 2022, excavation work was started under the top cover (starting from a height of approx. 514.0 m). The first bracing level (E-1) at approximately 505.5 m is expected to be reached by the end of April 2022.

Bernhard Lanbach, BERNARD Gruppe
Photo: © Dietmar Schaller, INGE Bauüberwachung