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Author(s):	Spyridis, Panagiotis; Nasekhian, Ali; Skalla, Gerald
Title:	Design of SCL structures in London / Entwurf von Tunnelbauwerken in Spritzbeton-Bauweise am Beispiel London
Abstract:	The underground metropolitan transport network of London is not only the oldest worldwide, but also one of the busiest, serving approximately a billion passengers annually. Both of these characteristics induce an accelerating necessity for new infrastructure as well as maintenance and rehabilitation of the present infrastructure, which of course includes the upgrading and extension of existing underground stations. Next to that, especially with London being one of the most condensed regions in the world, influence of tunnelling works on the built environment can hardly be matched. A huge design challenge is then to develop an appropriate balancing solution that guarantees, apart from the new structures' safety and functionality, the operational and structural integrity of the existing neighbouring structures and surrounding assets and utilities. Under these circumstances, Sprayed Concrete Lining (SCL) structures are very often a preferable option, due to the flexibility in geometries and the ability to regulate the impacts on surrounding structures during construction. This paper aims to present the status of London transport infrastructure and recent important initiatives towards its improvement (i.e. the LU upgrade plan and the Crossrail project), the sensitivities and particularities of underground sprayed concrete constructions in London, and an outline of case histories from Dr. Sauer and Partners (DSP) involvement in respective projects, namely the London Underground Green Park Station, the Bond Street Station, and the Tottenham Court Road Station upgrades and the Crossrail Farringdon Station, the Limmo Auxiliary Shaft and the Independent Category-3 design checks of the Crossrail project. Das unterirdische Stadtverkehrsnetz von London (The Tube) ist nicht nur das weltweit älteste, sondern auch eines der verkehrsreichsten, mit rund einer Milliarde Passagiere jährlich. Beide Aspekte ergeben ein sich beschleunigendes Bedürfnis für neue Infrastruktur sowie für Wartung, Erweiterung und Modernisierung der bestehenden U-Bahn-Stationen. Da der Großraum London ein besonders dicht besiedeltes Gebiet ist, hat der Einfluss von neuen Tunnelbauwerken auf bestehende Gebäude eine enorme Bedeutung. Dadurch ergibt sich eine erhebliche Herausforderung, die Struktur und den Betrieb benachbarter Bauwerke und der umliegenden Infrastruktur bzw. Anlagen zu gewährleisten. Unter diesen Bedingungen wird die Spritzbeton-Tunnelbauweise (SCL) aufgrund der flexiblen Geometrien und die Fähigkeit, die Auswirkungen auf die umgebenden Strukturen zu regulieren, sehr häufig eine bevorzugte Option. Dieser Bericht zielt darauf ab: (i) den Status der Londoner Verkehrsinfrastruktur und wesentliche Initiativen zu ihrer Verbesserung (d. h. den LU Upgrade Plan und das Crossrail-Projekt) darzustellen, (ii) die Besonderheiten der Spritzbeton-Tunnelbauweise in London zu dokumentieren und (iii) einen breiten Erfahrungsbericht der Fa. Dr. Sauer und Partner (DSP) zu entsprechenden Projekten zu geben. Dabei handelt es sich um die Upgrades von London Underground Green Park Station, Bond Street Station und Tottenham Court Road Station sowie die Crossrail Farringdon Station, den Limmo Hilfsschacht und die unabhängige Überprüfung der Planung von Crossrail-Tunnelbauwerken.
Source:	Geomechanics and Tunnelling 6 (2013), No. 1
Page/s:	66-80
Language of Publication:	English/German

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