Tunnels and underground structures
- Project Owner : Etat de Genève (Suisse)
- Mission : Maîtrise d’œuvre complète
- Cost of the works : 70’000 kCHF
- Cost of the mission : 4’400 kCHF
- Mission date : 2005-2011
DESCRIPTION SOMMAIRE ET CARACTERISTIQUES DU PROJET
The Meyrin cut-and-cover project was part of the final stages of work on the Tram-Cornavin-Meyrin-CERN (TCMC). The aim was to improve traffic flow in the village of Meyrin (25,000 v/d) and to build the extension of the tram towards CERN. The route de Meyrin was buried by means of a covered trench. The tram tracks were built on the backfilled slab.
The works involved the creation of :
- A 715-metre-long cut-and-cover tunnel,
- Two 95-metre-long traffic hoppers,
- An area of technical premises dedicated to the structure’s operating systems,
- Two 3.50-metre traffic lanes,
- Three SOS niches
- Three emergency exits
Technical characteristics :
- Moulded walls 60 cm and 80 cm thick (17,800 m2),
- 80 cm diameter bored piles (2,000 ml),
- Concrete (15,950 m3), reinforcement (1,250 tonnes),
- Temporary nailed wall supports (400m2),
- Top-down construction (27,500 m3 of earthworks),
- Open and lined trenches (56,100 m3),
- Pavement structure (6,000 m3), bituminous surfacing (1,970 t),
- Installation of sewerage and drainage networks (24,500 ml),
The main constraints of the project were as follows:
- Maintaining access to the village centre for shops and emergency services despite the cramped nature of the site,
- Maintaining traffic flow on the existing cantonal road during the works,
- Existing networks to remain in service
- Proximity to the plumb lines of existing buildings.
MISSION
As a civil engineer and geotechnician in a multi-disciplinary consortium, GEOS carried out a complete project management mission including the following services:
- Preliminary design,
- Final design,
- Application for planning permission,
- Invitation to tender,
- Execution project,
- Construction management,
- Commissioning and completion.
GEOS Ingénieurs Conseils, as leader of the GETM consortium, also carried out the following coordination tasks:
- Administrative management of the project.
- Coordination of the technical design of the structure.
- Supervision of the project’s financial management.
- Management of technical responsibilities: civil engineering, geotechnics, geology, waste management and special works.
- Technical and administrative management of subcontractors for electromechanical equipment required for user safety, ventilation, lighting, signalling, video surveillance, fire detection and defence, acoustics and landscape architecture.
