Benin: Fishing Route (Phase II)/Slave Route (Ouidah)

TO Ouidah (Benin), the construction site of the Fisheries Route — Phase II includes the realization of the Slave Route and its ramps, with a major challenge: to secure and maintain a coastal axis subject to the constraints of the lagoon and rainy seasons.

Background & purpose

The program entrusted to SOGEA SATOM focuses on development and paving:

• Of the section Adounko — Gate of No Return — Bouche du Roy (35.80 km)
• Braces Adounko — Cococodji (4.73 km), Avlékété, Pahou (5.22 km) and Gate of No Return — RNIE Ouidah (8.00 km)
• That is a total linear of approximately 53.75 km.

Technical challenges

• Achieve a retaining wall in a wetland, with part of the work that can be submerged up to 1.50 m During the rainy season
• Carry out the earthworks (purges under Atalus and under the pavement) and the assembly of the wall with a clear objective: Put the project out of water (+1.5 m) before the rains arrive
• Implement a specific pose partly submerged, with elements positioned so as to touch each other on the area concerned

Solutions implemented

• Pose of the first Atalus 120 for the retaining wall of the Slave Route
• Site organization oriented “out of water”: earthworks, purging, assembly and backfilling according to the construction phases
• Geotechnical reinforcement (depending on the project) with geotextiles provided by SOLMAX

Result

The “out of water” objective has been achieved: the structure is secured against the rains, and the Slave Route Start to change face, demonstrating the relevance of an ATALUS modular support in a tropical and hydraulically constrained environment.

Speakers

• Project owner: Republic of Benin
• Project manager/Design office: INGEROP
• Business: SOGEA SATOM
• Reinforcing geotextiles: SOLMAX

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