Projet
Renewal Ritom Hydroelectric Power Station
Renewal Ritom Hydroelectric Power Station
Piotta
Built in 1920, SBB’s Ritom hydropower station in Tessin is being refurbished and extended to improve electricity supplies to the Gotthard railroad. For this purpose, the new, greatly enlarged pressure line to Lago Ritom, which is 800 meters higher, has been reocated completely underground. Marti Group worked on this complex overall refurbishment on behalf of Ritom SA. Due to water ingress and geological fault zones, the various teams were presented with major challenges, particularly when performing work inside the mountain.
| Client | Ritom SA c/o FFS SA |
| Execution | Marti Tunnel AG |
| Construction period | 2018 – 2022 |
images
Setting up the tunnel boring machine in the assembly cavern
Start ramp of the tunnel boring machine
Transport track from the assembly cavern to the tunnel boring machine
Securing rock material in the fault zones using liner plates
At the front in the drill head of the tunnel boring machine
Narrow and steep conditions for the tunnel boring machine
The compensating basin and the new and old power plant in Piotta
The raw construction of the new power plant
In the inner lining of the new power plant
The Piora access shaft with the material cableway
The retaining wall of Lago Ritom
Successful breakthrough in February 2022
Facts & Figures
special features
- Access shafts, pressure galleries, and caverns in blasting operations, sloped shaft in TBM driving operations
- Lower inclined shaft 42% (length 880m)
Upper inclined shaft 90% (length 633m)
Change in slope within a radius of 150m - Gripper tunnel boring machine with backloading drill head and dual implementation of mechanically self-inhibitory fallback prevention device
Diameter tunnel boring machine
0.00
mTotal length pressure gallery
0000
madditional information
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