Mount Edgecombe Interchange Upgrade
This project showcases the use of concrete in civil engineering infrastructure in that it encompasses 9 new road bridges, 1 new pedestrian bridge, 9 mechanically stabilised earth walls, and 3 soil nail retaining walls. It featured three simultaneous incremental launches with a combined deck length that exceeds 1.5 km, the longest incrementally launched viaduct in the southern hemisphere, and three incremental launches being constructed simultaneously. This is a South African first. It was constructed under difficult conditions having to deal with maintaining the requirements of the heavy existing traffic demands within a congested site.
As a result of the vast scope, the wide variety of engineering disciplines and different construction elements, a total of 41 concrete mixes were designed for this project as well as three different grout mixes and two different sprayed concrete (shotcrete) mixes.
South Africa’s largest interchange with its wide use of finishes, techniques and elements is a deserved winner of the Fulton Award in the “Infrastructure” Category.
Location: Umhlanga (KwaZulu-Natal)
Submitted By: SMEC Consulting Engineering
Client: South African National Roads Agency Ltd SOC
Principal Agent: SMEC Consulting Engineers
Main Contractor: CMC Di Ravenna South Africa Branch
Specialist Sub-Contractors: VSL Construction Solutions
Suppliers: Natal Portland Cement, Ital Concrete, Conchem Construction Chemicals