S21-Berlin – Design And Underwater Construction Of A Covered Contrustion Pit Without Direct Accessibility From Above

Deep Foundations Institute
Grischa Dette Holger Merski Thomas Schröder
Organization:
Deep Foundations Institute
Pages:
10
File Size:
3825 KB
Publication Date:
May 1, 2022

Abstract

For the construction of the tunnel for the new Berlin S21 light rail line, a construction pit had to be built below the crossing B 96 federal road. For this purpose, the construction pit M’ has been built beforehand as a preliminary structure for the later S21 Berlin. A crucial element of this structure is a 2.50 m deep reinforced concrete deck slab which carries the B 96. During the later construction of the S21, it became clear that the existing preliminary structure could not be used without major modifications. Consequently, the construction pit design was gradually upgraded – still with the aim of retaining the basic concept of a trough structure with a jet-grouting cut-off. As construction progressed, for reasons of stability it became necessary to develop a fundamentally new concept with an underwater concrete base replacing the jet-grouting cutoff. This paper describes the planning and construction of a cut-and-cover structure with an underwater concrete base – a layout that brings with it the difficult task of underwater excavation and concrete placing without direct accessibility from above. Special emphasis is placed on describing the innovative approaches in connection with a remotely controlled underwater dredger from the Norwegian offshore industry for excavation works. Furthermore, the sophisticated underwater technologies for concrete placing in the confined surroundings are described.
Citation

APA: Grischa Dette Holger Merski Thomas Schröder  (2022)  S21-Berlin – Design And Underwater Construction Of A Covered Contrustion Pit Without Direct Accessibility From Above

MLA: Grischa Dette Holger Merski Thomas Schröder S21-Berlin – Design And Underwater Construction Of A Covered Contrustion Pit Without Direct Accessibility From Above. Deep Foundations Institute, 2022.

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