14 new bridges between Labasa and Nabouwalu
The local geology and coastal environment were key considerations for the bridges design.
This project involves construction of 14 new bridges along a 70 kilometre main road between Labasa and Nabouwalu in the Northern Division of Fiji Islands. The 14 bridges over rivers and streams include single span, two and three span bridges founded in variable geological ground conditions.
In addition to the variable geology, coastal environment, humidity, flood and tide were the main factors which were considered in the bridge design as most of the bridges are situated in coastal areas.
Opus was initially engaged by the bridge construction contractor China Railway First Group (CRFG) to undertake the foundation pile design for the tendered bridge designs using the geotechnical investigations carried out by the CRFG under a tight delivery timeframe. The foundations designed included driven steel H piles, bored concrete piles and shallow concrete footings as dictated by the investigations results.
The design required that all 14 bridge superstructures provide a 100 year life durability standard in the humid Fiji coastal environment to fit on the foundations already designed. The expertise of our concrete materials specialists allowed us to identify the design standards and the construction requirements and priorities to optimise the delivery process, which has helped the contractor to get the construction going as scheduled.
The bridge construction is still on-going with the foundations, abutments and wing walls completed and the bridge superstructure beams and decks being installed.