In mid-June we started excavating a new vertical shaft for the company IFK – Implenia Frutiger Kerenzerbergtunnel.
The ventilation shaft has a length of approximately 140m and a final diameter of 4.5m. The excavation is carried out by means of Raise Boring technology in medium abrasion limestone.
The pilot hole phase with 12″ 7/8 rods has already been successfully completed. A deviation of only 5cm was recorded over the total length of 140m.
Finished the boring phase to complete the excavation to a diameter of 4.5m, the project was successfully completed in late August 2021.
