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Author(s):	Frodl, Stephan
Title:
Abstract:	Emergency exits must be available at certain intervals in tunnels for safety reasons. For this purpose, cross passages are excavated to a second tunnel tube, to shafts with staircases or separate exit tunnels. For the excavation of these emergency exits in TBM drives with segmental lining, openings have to be provided in the segmental lining. This article outlines different systems to make openings in segmental linings. The choice of a suitable system depends on various constraints, e.g. the geometric dimensions of the tunnel tube and the cross passages or the prevailing soil conditions. In addition, the loadbearing capacity and serviceability is also very important. In Tunnelbauwerken müssen aus sicherheitstechnischen Gründen in bestimmten Abständen Rettungswege vorhanden sein. Hierzu werden Querschläge zu einer zweiten Tunnelröhre, zu Schächten mit Treppenaufgängen oder auch separate Fluchtstollen hergestellt. Für den Bau dieser Rettungswege in maschinell vorgetriebenen Tunnelröhren mit Tübbingausbau müssen bei allen Varianten Öffnungen in der Tübbingschale ausgebrochen werden. Im Beitrag werden verschiedene Systeme zur Herstellung von Öffnungen in Tübbingschalen vorgestellt. Die Wahl eines geeigneten Systems hängt von verschiedenen Randbedingungen wie den geometrischen Abmessungen der Tunnelröhre und der Querschläge oder den anstehenden Baugrundverhältnissen ab. Darüber hinaus spielen aber auch die Tragfähigkeit und die Gebrauchstauglichkeit des Tübbingausbaus eine entscheidende Rolle.
Source:	Geomechanics and Tunnelling 12 (2019), No. 1
Page/s:	69-81
Language of Publication:	English/German

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