BY SIPHOSETHU MABUZA
MANZINI– The use of a steel walking deck on the Nkosinatsi Suspension Footbridge introduces a different approach to pedestrian bridge construction in Eswatini, with potential benefits for durability, maintenance and long-term community access.
Unlike the timber decking traditionally used on similar suspension bridges under the Eswatini programme, steel offers an alternative that is generally less vulnerable to rot, insect damage and deterioration caused by prolonged exposure to moisture, provided it is properly protected against corrosion.
Timber remains a useful construction material, but its performance can be affected by weather, repeated exposure to water and the gradual weakening of individual planks. Depending on the type of wood, its treatment and the conditions in which it is used, timber decking may require regular inspections, repairs and replacement of damaged sections.
Steel decking can offer a longer service life when designed, installed and maintained appropriately. Its strength can support regular pedestrian use, while damaged or corroded sections can be identified through inspections and addressed before they compromise the structure.
However, steel is not maintenance-free. Exposure to rain and humidity can cause corrosion if protective coatings are damaged or not maintained. Its long-term performance therefore depends on appropriate design, corrosion protection, drainage and routine inspections.
For rural communities that depend on pedestrian bridges to reach schools, clinics, markets and other essential services, the choice of decking material can have practical consequences. A durable walking surface and a consistent maintenance programme can help reduce disruptions to access, particularly during periods of heavy rainfall when river crossings may become dangerous.
The Nkosinatsi Suspension Footbridge is the first under the Eswatini programme to feature a steel walking deck, replacing the timber decking traditionally used on similar pedestrian suspension bridges.
The change highlights the importance of considering not only the initial construction of community infrastructure but also how materials perform over time. When properly designed and maintained, steel decking could help reduce the frequency of repairs and support more reliable access for the communities that depend on these crossings.
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