Enabling progress through roads and bridges

Bustling port town and capital city of Rivers State, Port Harcourt, is witnessing remarkable strides. It has been enabled for economic expansion with two more flyover bridges constructed by Julius Berger.

Flyover Bridge 11, situated at Ikwere Rumuokwuta Choba and Rumuola Road Junction is a dual carriageway with ground service lanes consisting of 21 spans (21x22.5m = 472.5m) and two ramps with an approximate total length of 210m. The project has two roundabouts.

The project spans a total construction length of around 1,005.1 metre at the longitudinal direction of the flyover. The bridge took 168 precast beams and was founded on 272 Continuous Flight Auger (CFA) piles of ɸ800 diameter at 19.85 metres length from cut-off level. Theproject has a total of 4 pedestrian crossings and two crossings for each roundabout area with traffic lights under the flyover for pedestrians.

Equally impressive is Flyover Bridge 12 at Rumuokwuta Choba and Ada-George Road Junction. This bridge too features a dual carriageway with convenient ground service lanes. The bridge encompasses an impressive expanse of 13 spans, each measuring 22.5 metres (resulting in a total distance of 292.5 metres) along with two well-designed ramps that combines to a length of approximately 228 metres.

The construction project spans a total construction length of around 919 metres at the longitudinal direction of the flyover. The bridge took 104 precast beams and was robustly founded upon 176 Continuous Flight Auger (CFA) piles of ɸ800 diameter at 19.85 metres length. It has two pedestrian crossings with traffic lights under the flyover for pedestrians.

Both Flyover Bridges 11 and 12 feature spans set at intervals of 22.5 metres. Their approach way ramps, designed with a gentle gradient of a maximum 4% incline, facilitate seamless transition. The road pavement design consists of a 200mm thick cement-sand subbase, with an average cement content of 5% by weight. Additionally, a 200mm granular stone base provides stability, complemented by a 100mm thick layer of asphalt concrete surface. The topmost layer of the superstructure is composed of a 60mm thick binder course, topped by 40mm wearing course of asphaltic pavement.

Both bridge projects incorporate comprehensive traffic light systems at flyover junctions, meticulous road marking on flyover bridges and service lanes, as well as the strategic placement of traffic signs at roundabout junctions to enhance safety. Their new service lanes are provided with efficient drainage systems and culvert to manage water flow effectively.

Enhancing aesthetics, the bridges feature beautifully adorned roundabouts and traffic islands embellished with stone chippings. The enclosed islands are bounded with concrete parapet wall measuring one metre in height, complemented by sturdy one-meter high mesh wire fencing.