Formwork & Falsework International Vol 2 No 1
South Africa - At 947 m long - the Country’s Longest Viaduct - Page 2 of 3
The 20 m long bridge deck sections are produced on land and then pushed out incrementally using the bridge launching system towards the completed pier heads.
The challenging nature of the project meant that 70% of the formwork solutions are custom-made, including the launching bridge system. Another challenge was not interfering with the traffic below.
- 200 m² of standard P300 formwork for foundations and piers.
- 500 m² of special steel formwork, divided into five sets for the construction of the viaduct piers
- 350 m² of additional special steel formwork made up of three sets for the construction of pier cups.
- Two sets of formwork model, MAXIMIX, and custom-made products for a total of 940 m² for the casting of the bridge decks.
- The OMNIMODE system integrated with customized solutions for the construction of suspended working platforms during the launching phase of the decks,
- Climbing system.
Through experience and working with the contractors, Pilosio was able to offer the best solution in terms of speed of work, site safety, optimization of equipment and also of aesthetics.
The Pilosio technical department responded quickly and expertly to the various criteria of the project, such as rapid supply times, coordination with the various organizations involved in the project, the need to design a formwork system for the piers adaptable to two different sizes and a scaffolding system optimized for the launching bridge system.
The construction is jointly funded by Sanral and the KZN Department of Transport and the upgrade will take about three years to complete.
The large area Pilosio steel forms used for the 23 m high piers allow plenty of room for the workers to access the rebar, etc.
The civil construction is being undertaken by Italian construction company CMC di Ravenna, with construction being supervised by engineering and development consultant Smec South Africa.
Sanral’s contract with CMC di Ravenna stipulates minimum targets for employment from within the eThekwini municipality region, as well as for small contractors and businesses from KZN.
The scope of work for the southern approach that includes the widening of the northbound carriageway from four lanes to five lanes; widening the southbound carriageway from three lanes to five lanes; an additional northbound three lane auxiliary off‐ramp; and median barriers and retaining walls.