The project consists in building a road link alongside the river Congo to improve access to downtown Brazzaville. The Congo government awarded the construction contract to the Chinese company CRBC. The project had to overcome a number of geotechnical difficulties:
- alluvial environment of the river banks necessitating soil reinforcement,
- cable-stayed structure with heavy loads, necessitating deep foundations of large diameter,
- presence of compressible and changing materials.
All the structures have been founded on piles because of the poor characteristics of the superficial materials and the need to account for strong horizontal loads. The embankment sections have necessitated the use of retaining walls on reinforced soil (stone columns), and the high embankments the use of rigid inclusions in order to meet the stability and deformation criteria. Construction lasted from 2013 to 2016.
