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he Mtentu Bridge between Durban and Coffee Bay is set to knock the Bloukrans Bridge off the pedestal of being the highest bridge in South Africa and one of the highest in the world. An essential part of the South African National Roads Agency’s (Sanral) N2 Wild Coast Toll Road project is the construction of two record-breaking megabridges over Eastern Cape rivers. One will become the highest bridge in the southern hemisphere, and the other possibly the longest cable-stayed suspension bridge in Africa. According to Sanral communication manager, Vusi Mona, the bridges will offer visual and engineering delights to citizens and tourists alike. Construction is expected to start early next year and be completed in 2021. The first mega-bridge will cross the Mtentu River just outside Xolobeni, south of Port Edward. The second will cross the Msikaba River near Lusikisiki. The Mtentu Bridge will be one of the longest main-span balanced cantilever bridges in the world, and the first of its size in South Africa. Reaching heights of around 220m, it will become the highest bridge in Africa and the entire southern hemisphere. The current highest is the Bloukrans Bridge, which has a 217m deck height. The construction of the 1,1-km-long bridge in a remote location is a major undertaking requiring specialised engineering skills and building techniques, according to Edwin Kruger, Sanral’s bridge network manager: “No South African firm has ever done a balanced cantilever bridge of this magnitude before, which is why South African tenderers have joint ventured with international firms to bring skills and expertise into the bridge’s construction.” The second mega-bridge, the Msikaba Bridge, will be 580m long. “This bridge will cross the spectacular Msikaba river gorge and will be the longest span cable-stayed suspension bridge in South Africa — and possibly Africa,” says Kruger.
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Dreams finally come true
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Ben Trovato — Under the Influencer
We’re all equal before the wave
Bridging the divide
ARCHITECTS’ ILLUSTRATION The 580m new Msikaba Bridge near Port St Johns is set for construction early next year.
“Cable-stayed bridges are distinct in their use of towers and cables to support the bridge deck. This single span bridge will be anchored back into rock on either side of the gorge.” The bridges form the backbone of the Wild Coast project, and is a national priority coordinated and directed by the Presidential Infrastructure Coordinating Commission. Kruger explained: “Extending from Port Edward through
Port St Johns, this section is a brand new road and without the bridges we cannot complete the highway.” The project is one of the government’s 18 Strategic Integrated Projects to support economic development and boost service delivery in South Africa’s poorest provinces, such as the Eastern Cape. One of the environmental requirements is that Sanral does not touch the unspoiled Msi-
kaba gorge at all. According to Kruger, “the cable-stayed design will ensure that the construction of the bridge will have no direct impact on the environment in the gorge”, almost 200m below. Environmental lobby groups have expressed concern related to the project’s impact on the Pondoland biome. But Sanral says it used specialist studies conducted during the environmental impact assessment (EIA) to ensure that the route avoids
the most sensitive areas of the Pondoland. In addition, rehabilitation measures include a search and rescue programme for threatened or protected flora species. A biodiversity offset agreement has also been established with the Eastern Cape Parks and Tourism Board. This is intended to ensure that the Pondoland biome is preserved for generations to come through the declaration, rehabilitation and ongoing protection of some 15 000ha of new conservation areas. According to Craig McLachlan, Sanral southern region’s project manager, “conservation measures are put in place before any work begins on the highway. Before we start any construction we will send a specialised team into the area to retrieve bulbs, succulents, and other plants that can be relocated. “We have set up nurseries that then preserve and further propagate these plants. These plants are then used for rehabilitation, and if we have an excess they will be translocated into protected areas such as the Mkambati Nature Reserve.”
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