Tunnels and underground constructions
- General Contractor: Department of Urban Planning (City of Geneva)
- Assignment: Complete project management
- Total cost of work: 29’000,– kCHF
- Total cost of the assignment: 805,– kCHF
- Completion date: 2011-2015
PROJECT DESCRIPTION AND CHARACTERISTICS
This project involved creation of a parking lot for the World Trade Organization (WTO). It has four levels of underground parking (400 spaces) and will accommodate a building of 8 levels in superstructure.
The site is bordered by the SBB lanes, the World Meteorological Organization (WMO), and is located in a dense and rapidly changing urban area. Thus, within the framework of this project, it was necessary to take into account the neighboring projects and to analyze their influence on the dimensioning of the structure, and the phasing of implementation, among others.
The main issues of the project were:
- Protection of the groundwater (piezometric monitoring, so called jambes de pantalon reinforced walls),
- Evacuation of polluted areas (establishment of a precise earthwork phasing in order not to pollute healthy land).
- Construction of a building site in a dense urban environment,
- Realization of a deep excavation at the edge of existing buildings and railway tracks in service.
Technical characteristics:
- Parking enclosure in a molded wall 60cm thick (5,560 m²)
- Drawing of active anchorages (3T15S) (200 anchorages and 2,500 ml of boreholes),
- Heavy digging of the excavation enclosure,
- Excavation of land at polluted sites (approximately 45,000 m³),
- Casing below ground level for the last 2 levels of the parking,
- Concrete (7,500 m³), Reinforcement (800 tons).
ASSIGNMENT
As civil engineers and geotechnical engineers belong to its international and multidisciplinary group, GEOS carried out a mission of complete Project Management including the following services:
- Pre-project,
- Final project,
- Application for permission to build,
- Invitation to tender,
- Execution project,
- Construction management,
- Commissioning and completion.
