Project Description

Construction of a US$ 39 million new international link between Nigeria and Cameroon is underway after being awarded to the Chinese contractor CGCOC. The project is funded by the African Development Bank. Pedelta, as the lead design firm in a Joint Venture with Kedmor Engineers, was retained by the Ministries of Public Works of Nigeria and Cameroon for engineering services of the concept and detailed design for the new 1.5 km long road, which includes a new two-lane international bridge over the Cross River at the Cameroon-Nigeria Border in Ekok-Mfum. The contract also included the structural assessment of the existing suspension bridge built in the 1950s. This bridge is a critical part of the Bamenda-Enugu corridor that will become a main link between the two countries, and a key component of the Lagos-Mombasa Trans-African Highway. The bridge will replace a functionally obsolete single lane suspension bridge.

The new 403 m long structure over the Cross River is a continuous concrete box girder deck with six spans with lengths of 35+150+85+50+50+31 m. The three first spans over the Cross River will be segmentally built in balanced cantilever to protect the natural environment, and to mitigate the impact on the riverbanks and the requirement for construction equipment. The remaining portion of the bridge will utilize a span-by-span construction sequence with traditional falsework.

Design/Construction Approach

The project presented two main parts: the assessment of the existing bridge and the detailed design of the new one following the Eurocodes. Regarding the existing suspension bridge, Pedelta performed site inspections, surveys and non-destructive tests, in order to inform the client on the cost of rehabilitating or dismantling the structure. Regarding the new bridge, Pedelta provided a full in-depth study, including the preliminary and detailed designs, bid and contract documents, cost estimates and participation in the bid evaluation process for the selection of the works contractor.

Further Information
Federal Ministry of Works of Nigeria & Ministry of Public Works of Cameroon
Cross River (Nigeria-Cameroon Border)
Key Elements
Counterweight Span, Balanced Cantilever, Structural Eurocodes
Feasibility Studies/Conceptual Design
Detailed Design
Load Rating and Assessment