Lusaka City Decongestion Project - Munali Flyover

The Lusaka City Roads Decongestion Project was a unique initiative aimed at constructing and rehabilitating roads in Zambia's capital through rehabilitating and widening 69km of lane roads, constructing 27km of bidirectional dedicated bus lanes, four flyovers, and five at-grade junctions. Afcons Infrastructure Ltd. was awarded this $290M design-build contract by the Republic of Zambia's Ministry of Local Government.

Our team was responsible for the independent design review of the Munali Flyover. This structure comprises three simply supported composite steel spans with a span arrangement of 31m, 40m, and 40m, and a mild plan radius of curvature of 2000m. The 14.6m wide superstructure supports four traffic lanes, separated by a 0.6m wide central crash barrier. A 225mm cast-in-place deck slab is supported by six lines of straight plate girders spaced at 2.5m. The girders have depths of 1.7m and 2.1m for the 31m and 40m spans, respectively. The substructure consists of a two-pier portal arrangement supporting a hammerhead pier cap, which in turn is supported only by an open foundation. Additionally, our team reviewed the shop drawings of the plate girders for general conformity to the design drawings.

In response to our client's requirements, our team undertook this fast-tracked assignment. We promptly completed the initial review of the entire bridge, aligning with the tight timelines set by the contractor. Our comprehensive review of the design and drawings allowed us to identify and address any concerns, which ultimately contributed to the timely completion of the project.