The Prenner Pedestrian Tunnel in Ischgl: DSI produces and supplies Ground Support Products for Safe Tunnel Excavation
The Prenner Pedestrian Tunnel is located in the center of Ischgl, Austria and when finished, will ensure a direct connection of the parking garage in Ischgl’s center with the 3-S Pardatschgrat gondola. The mined part of the tunnel included in this contract is 130m long and has a cross section of approx. 26m².
The owner, Silvrettaseilbahn AG, awarded the contract for the tunneling work to ÖSTU-STETTIN Hoch- und Tiefbau GmbH, Austria. Due to the fact that the tunnel is located directly underneath the densely developed town center of Ischgl, tunnel work has to be carried out very carefully. The tunnel portal had to be elaborately stabilized in advance using R32-250 Ø DYWI® Drill Hollow Bar Anchors and shotcrete. The moraine material in the area of the jobsite is loose and partly contains blocks the size of houses. To stabilize the tunnel advancement, 95/20/30 3-bar Lattice Girders and P230-364-bar Lattice Girders were installed. The goal is to complete structural work before the 2015/16 winter season so that the tunnel can be opened for pedestrians. Once completed, the tunnel will also be equipped with 2 escalators for providing additional comfort to ski-tourists.