On the existing corridor of a freight rail line, Ingerop is designing a new metro for Abidjan, one of the most dynamic cities in Africa. Metro Line 1 spreads along 37km from north to south and crosses Abidjan lagoon via an exceptional bridge. The line will serve 20 new stations. Two intermediate terminus stations will allow operating the central section with a double frequency. For the concessionaire led by Bouygues and Alstom, Ingerop has provided the full layout, civil works and stations including the main track layout study and its impact on infrastructures, earthworks, geotechnical studies or hydraulic studies.

Abidjan Metro Line 1 is a surface train 37 km long spreading from North to South and crossing the Abidjan lagoon. The line will serve 20 new stations. 2 intermediate terminus stations will allow to operate the central section of the line with a double frequency.

Specificities

The layout uses a narrow urban corridor twinning with the freight SITARAIL line, which implied numerous retaining walls and overpasses.

The construction has been awarded to a consortium led by Bouygues TP under a PPP scheme.

The assignment consists in providing a layout study, then a Preliminary and a Detailed responding to the requirements of the Ministry of Transportation, and defining a bankable project for a PPP realization.

The program and the studies have been optimized to that purpose. For example, one intermediate step consisted in analyzing 3 various infrastructure scenarios, corresponding to 3 tariff scenarios and thus 3 passenger traffic scenarios.

Assignment

The full layout, civil works and stations were studied :

• Main track layout study, and its impact on SITARAIL infrastructures,
• Earthworks,
• Geotechnical studies,
• Hydraulic studies,
• Bridges : underpasses, overpasses, footbridges for public crossings and at stations,
• Stations (platforms, buildings, Civil works and systems integration).