Client
Canton de Berne - Office des Ponts et Chaussées
Execution
2012 - 2016
Collaboration
In partnership, BG as pilot of the group
Total costs
45 mio EUR
Project description
Geology
- Surface colluvium, altered molasse, unaltered molasse
- Heterogeneity, marl layers, local sandstone layers
- Mediocre quality, soft to very soft consistency, sensitivity to alteration
- Limited water ingress
- Slippages in the upper layers and at the portals
Loveresse Tunnel
- 400 m length in molasse
- East cut and cover trench: length 50 m with adjoining technical room
- West cut and cover trench: length 50 m with adjoining technical room
- Emergency exit in the middle of the tunnel
Key characteristics
- Total length of the section: 500 m
- Mechanical excavation, moving upward
- Earth support with heavy ribs and stabilisation measures over the entire length using long forepoling anchors at the excavation face, and micropiles
Tunnel
- Excavation: 54,750 m3
- Concrete for earth support: 21,330 m3
- Heavy support ribs: 1,830 t
- Forepoling steel support tubes : 24,000 m
- Micro-piles : 4,810 m
- Excavation face anchorages: 31,500 m
- Waterproofing and drainage: 10,780 m2
- Concrete (lining, service gallery and internal profiles): 14,100 m3
Services provided
- Scheme design,
- detailed design,
- tender process,
- construction design,
- direction of the site works.
