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Abstract:	Das Projekt S21 stellt eines der wichtigsten infrastrukturellen Bauprojekte in Berlin da. Aufgrund der bereits vorhanden unter- und oberirdischen Bebauung nördlich des Bahnhofs und der geplanten städtebaulichen Entwicklung ergeben sich für die Teilbaugruben des Projekts S21 unterschiedlichste Randbedingungen. Insbesondere die Nähe zu den unterirdischen baulichen Anlagen der Fern- und U-Bahn sowie die Nutzung der B96 und der Invalidenstraße während der Bauausführung stellen besondere ingenieurtechnische Herausforderungen dar. In diesem Bericht werden die daraus resultierenden Baugruben- und Abdichtungssysteme aufgezeigt und insbesondere die Herausforderungen des Tunnelbereichs mit Überbauung unter anderem durch das Hochhaus MK8 beleuchtet. Die vielfältigen technischen und formellen Anforderungen eines komplexen innerstädtischen Tunnelbauvorhabens werden aus Sicht der Prüfer für das Eisenbahn-Bundesamt dargestellt. Tunnelling in urban area - Challenging demands on the geotechnical construction using the example of the S21 railway project in Berlin. The S21 railway project is one of the most important infrastructural projects in Berlin. With existing structures above and below ground plus further urban developments in the pipeline, the result is highly diverse boundary conditions for the numerous excavations needed for this project. In particular, the proximity to underground structures for long-distance and metro lines as well as the B96 trunk road and Invalidenstrasse, which have to remain open during construction, place high demands on the engineering. This report describes the ensuing shoring and waterproofing systems for the excavations and, in particular, the challenges posed by tunnels beneath buildings, including the high-rise building MK8. The various technical and procedural requirements of a complex urban tunnelling project are presented from the perspective of the checking engineers appointed by Germany's Federal Railway Authority.
Source:	geotechnik 38 (2015), No. 2
Page/s:	144-151
Language of Publication:	German

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