Mtwapa bridge – This bridge consists of three spans totaling 192 metres long and approximately 15 metres wide carrying two lanes. The superstructure is a prestressed box girder with the centre span of 111.9 metres. The outer spans are 40 metres each. The substructure consists of normal reinforced concrete Abutments and piers founded on piles. The construction of Mtwapa bridge was completed in 1980.
Inspection on the bridge in early 2000 found that the centre span had deflected. Like the Nyali Bridge renovations were not done until 2005. A highly specialized periodic maintenance was carried out when the bridge was observed to have developed a deflection of about 192 mm. The maintenance works involved an installation of additional post tension cable to avert further deflection of the bridge and the deflection was held in position.
They are the simplest in structural forms. They are supported by an abutment at each end of the deck. Since no moments are transferred through the support their structural type is known as simply supported. Bridges designed for modern infrastructure will usually be constructed of steel or reinforced concrete, or a combination of both. The concrete used can either be reinforced, prestressed or post-tensioned.
Constructions could have various beams side by side (with a deck across the top of them), to a main beam either side supporting a deck between them. The main beams could be I-beams, trusses, or box girders. They could be half-through, or braced across the top to create a through bridge. Beam bridges are not limited to a single span. Some viaducts such as the interchanges under construction in Nairobi – Thika highway and Eastern by pass at North Airport road and City Cabanas have multiple simply supported spans supported by piers.
Beam bridges are often only used for really short distances because, unlike truss bridges, they have no built in supports. The only supports are provided by piers.
Some of the major bridges in the country under this category include: Nyali and Mtwapa bridges both in Mombasa city. The construction of the two bridges started in 1978 and completed in 1980 and was done by Sumitomo Construction Company under the supervision of H.P. Gauff.
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