Culvert underpasses promote safe passage

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Each 3 m x 3 m jacking culvert weighs approximately 10.5 t

The City of Ekurhuleni, together with the Passenger Rail Agency of South Africa, launched the Tembisa Pedestrian Underpass Bridges Project in April 2022 to enhance safe mobility. This has led to the establishment of user-friendly underpasses at the Thami Mnyele and Golden Gate rail crossings.

The scope of works for the two underpasses entailed the installation of concrete jacking culverts, measuring 3 m x 3 m, which were purpose designed, manufactured and supplied by Rocla. Each culvert weighs approximately 10.5 t.

The project engineers specified that the culverts were to be jacked at a depth of 4 m below an existing rail embankment. “We at Rocla then set about customising elements of the culvert design to accommodate this,” explains Mohammad Bodhania, civil engineer, Rocla.

Among the major challenges on-site were the soil conditions. “The jacking walls, with support by 4 x 18 m anchors and piles in the ground, ensured the walls remained in place, while the use of bentonite limited friction during the jacking process,” explains Hendrik Ferreira, construction supervisor at Esor Construction.

Rocla specialises in the manufacture of a wide range of precast concrete products. These include pipes, manholes, concrete poles, wingwall units, sanitation, as well as bespoke designs that provide durable and practical infrastructure solutions.