Control and supervision of rehabilitation works of RN7, section Dosso-Bella II (83 km) and Output and performance-based road contracts (OPRC) of the Dosso - Bella II - Gaya (157 km) road
Country
NigerName of Client
Dosso regionDuration
11/2020 - 07/2025Project Description
The project provides for the full-width recycling of the existing road, the implementation of a foundation layer of lateritic gravelly cement stabilized with cement, the implementation of the base layer of 10 cm gravel bitumen and an asphalt concrete wearing course of 5 cm. The works also include localized soil replacement, the upgrading UEMOA of the road (10.2 including 7.2 m of roadway and 2 X 1.5 shoulders), the construction of 44 culverts of different sizes, gutters and hydraulic protections.
The ESIA component is highly developed with the implementation of mitigation measures, awareness-raising and support measures.
Following the rehabilitation works, maintenance of the road is planned with the GENiS (or MROR) method.
Road project geometry:
- Total road length: 88 km
- Width of the road in open countryside: 2 m
- Width of the road in built-up areas: 2 m
Road quantities:
- Earthworks (fill/cut): 90 000 m3
- Cement stabilized foundation layer: 190 000 m3
- Base layer in GB: 104 000 m3
- Wearing course BB: 35 000 m3
Structures:
- Box culverts: 5 000 m
- Pipe culverts: 44
Services Description
- Initial critical review of the design (plan, calculation notes, specifications, etc.) of the Dosso-Bella II road
- Technical control of all the works required to guarantee the required quality in accordance with the standards in force
- Control of services relating to environmental and social measures, in accordance with environmental and social clauses included in the Company's contract, in terms of quality, cost and time
- Supervision of the various control tests necessary for the implementation of the works
- Administrative and financial control essential for the smooth running of the work
- Acceptance of the works at the end of the rehabilitation of the Dosso-Bella II section of 83 km
- Technical inspection linked to the rehabilitation phase of the 83 km Dosso-Bella II section