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Author(s):	Burger, Werner
Title:	Multi-mode tunnel boring machines / Multi-Mode Tunnelvortriebsmaschinen
Abstract:	Classic tunnelling shields can reach their technical, but also their economic limits, when they have to drive through highly varied geologies along the tunnel route. A tunnel route may pass through extended sections of stable rock faces which alternate with soft, water-bearing loose soils. Such tunnelling routes are among the most demanding challenges in tunnel construction and they have to be mastered more and more often, because important infrastructures nowadays are being built in such formations. Herrenknecht has developed so-called Multi-mode tunnel boring machines especially for ground conditions of this kind. These are hybrid tunnel boring machines which offer optimum safety and flexibility when choosing the support and excavation method. They allow for an optimum tunnelling strategy that is adaptable to the conditions along the tunnel alignment. And they also have a positive influence on the desired efficiency. Multi-mode machines have different concepts in terms of how rapidly or how easily they can be adapted. The following chapters describe the functionalities of the Multi-mode TBM and the corresponding reference projects. In addition, this paper deals with the innovative concept of the Herrenknecht Variable Density TBM, a first universal tunnel boring machine for mixed ground conditions. Klassische Vortriebsschilde können bei geologisch variantenreich aufgebauten Tunneltrassen an technische, aber auch wirtschaftliche Grenzen stoßen. So kann eine Tunneltrasse längere Passagen standfestes Gebirge enthalten, das in weiche, wasserführende Lockerböden wechselt sowie umgekehrt. Derartige Streckenverläufe gehören zu den anspruchsvollsten Anforderungen im Tunnelbau. Sie stellen immer öfter eine Herausforderung dar, da wichtige Infrastrukturen in solchen Formationen gebaut werden. Herrenknecht hat speziell für solche Baugründe und Projekthintergründe sogenannte Multi-Mode-Tunnelbohrmaschinen entwickelt. Es handelt sich hier um hybrid aufgebaute Vortriebsmaschinen, die höchstmögliche Sicherheit und Flexibilität bei der Wahl des Stütz- und Abbauverfahrens bieten, also eine in Hinsicht auf den Streckenverlauf anpassungsfähige und möglichst optimale Vortriebsstrategie ermöglichen. Dies hat auch positive Effekte auf die gebotene Wirtschaftlichkeit. Multi-Mode-Maschinen sind hinsichtlich der Anpassungsschnelligkeit und des Anpassungsaufwands unterschiedlich angelegt. Die folgenden Kapitel beschreiben die Funktionsweisen der Multi-Mode-TBM und entsprechende Referenzprojekte. Zudem geht der Beitrag auf das neuartige Konzept der Herrenknecht “Variable Density TBM” ein, einer ersten universellen Vortriebsmaschine für Lockergestein.
Source:	Geomechanics and Tunnelling 7 (2014), No. 1
Page/s:	18-30
Language of Publication:	English/German

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