New stations on the Fornebubanen railway
The stations on the Fornebu Line are being built deep underground. Cautus Geo monitors the structures and ground conditions.
Problem statement
The Fornebu Line's six stations are being built between 12 and 43 metres below ground. Ground conditions vary. Construction is taking place close to critical infrastructure such as buildings, roads, railway lines and other infrastructure. Settlements, slides and collapses can be critical for more people than those directly involved in the work on the new underground railway.
Solution
Cautus Geo has established automatic and continuous monitoring in each of the construction pits. The ground conditions outside are also monitored where there are unstable masses. In addition, monitoring of struts and structures has been established in several of the construction pits. Tolerance limits have been set in close co-operation with the client and contractors. All data is continuously fed into Cautus Web for real-time analysis. Deviations trigger an immediate alarm to the contractors and Fornebubanen, the client.
In December 2020, construction of the Fornebu Line began. It is being built in a tunnel from Majorstuen in Oslo to Fornebu in Bærum. The railway will be completed in 2029. It will then be able to transport 8,000 travellers every hour. The distance from end station to end station is just under eight kilometres. The journey time will be 12 minutes.
The construction pits for the stations are up to 60 metres deep. Three stations are being built at Fornebu. The rest in Oslo.
There are many assignments on the Fornebu line. At Madserud, instrumentation for continuous and automatic monitoring was installed as early as 2022. The work there is now complete. All data is analysed continuously in the Cautus Web access solution. Threshold values have been set for alerts to the developer and the individual contractors.
The Fornebubane contracts
- K2A (Lysaker-Fornebu). Start-up April 2024 (2 years).
- K2B (new contract K7. Lysaker-Vækerø). Start in May 2023 (4 years).
- K2C (Skøyen). Start-up September 2021 (4 years).
- K2D (Skøyen). Start-up December 2023 (2 years).
- K1A (Majorstuen). Start-up September 2024 (2 years).
- K1C (Madserud). Start May 2022 (completed December 2023).
Customer
Fornebubanen - Implenia and others
Year
2021 - 2028
Location
Oslo and Bærum
Application area
Technology
Without instrumentation, uncertainty is high. This would have resulted in more conservative solutions and more expensive construction pits. For us as a developer, it's also important that we limit the impact on the railway's neighbours.
Geotechnical engineer Vegard Søderholm at Fornebubanen.
Contact person
Switchboard telephone +47 990 96 580 or e-mail [email protected]
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