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Title:	Cover Picture: Geomechanics and Tunnelling 2/2021
Abstract:	From the excavation pit of the future Sydney Metro Pitt Street station, a connecting tunnel had to be constructed underneath a busy road. To secure the station box wall, the AT - Pipe Umbrella System was used, which was installed at a 19° downwards. In close cooperation with the drilling equipment specialist Robodrill, DSI Underground has developed a successful concept for the installation of the AT - Pipe Umbrella System consisting of 60 individual pipes with a length of 18 meters each. For this project, DSI Underground's proprietary squeezed connection for pipe umbrella pipes has been used as a replacement for a conventional threaded connection. (photo: DSI Underground) Aus der Baugrube der künftigen U-Bahnstation Pitt Street der Metro Sydney heraus war ein Verbindungstunnel unterhalb einer verkehrsreichen Straße zu erstellen. In enger Zusammenarbeit mit dem Maschinenhersteller Robodrill hat DSI Underground ein erfolgreiches Konzept für den Einbau eines AT - Rohrschirms mit 60 Bohrungen zu je 18 m Einbaulänge erarbeitet, die mit einer Neigung von 19° fallend hergestellt wurden. Für dieses Projekt wurde die innovative Pressverbindung für Rohrschirmrohre als Ersatz für konventionelle Gewindeschraubverbindungen gewählt. (Foto: DSI Underground)
Source:	Geomechanics and Tunnelling 14 (2021), No. 2
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Language of Publication:	English/German

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