For SFE, a work has been carried out to mount casings in a drilled part of the pressure shaft - 432m.
The tunnel was lined with Ø914mm full-length pipes. Pipes in lengths of 12m with inverted rust treatment were welded together and pushed in. After the welding work was completed, the welding joints were successively rust-treated.
After installation, the gap between pipe Ø914mm and tunnel Ø1060mm is filled with concrete. In the space between pipes and mountains, cables for power and communication are also included.
The work on the installation of the lining was carried out on 25 February to 5 April.