The St. Anton am Arlberg ski resort is one of the most well-known resorts in Austria. In order to offer tourists more safety in addition to modern lifts, several retaining structures were built in high alpine areas near the Mattun Lift in the summer of 2014.
A slope widening that was carried out for the new Zammermoos Ski Route formed part of these improvements. In this area, a steep slope that was endangered by avalanches was flattened and stabilized step by step.
The foundation of the slope widening had to be comprehensively anchored in load-bearing rock. For this purpose, self drilling rock anchors were used as micropiles to stabilize the retaining structure. In this system, the tendon simultaneously serves as a drill rod as well as a micropile. This dual feature ensures a very quick installation procedure because the borehole does not have to be drilled in advance as the self drilling rock anchors are drilled and grouted simultaneously.
A total of 596 self drilling rock anchors were used for the foundation. This included 447 6m long R51-800 self drilling rock anchors as well as 149 8m long R51-800 self drilling rock anchors.
Thanks to the slope widening, skiers will be able to enjoy this part of the ski resort with minimal risk.