Kainantu Gold Project – Bridges
Eastern Highlands Province, Papua New Guinea
The gold mine is situated in the Eastern Highlands Province, PNG. The connecting road passes through open grassland into virgin rainforest and rises 441m. The two river crossings, Ramu River and Kasese Creek, represented a major construction challenge in this remote part of PNG.
Curtain Bros engaged Madsen Giersing (MG) to design two bridges as part of a design and construct contract for a 17km road.
The first crossing at Ramu River required a 50m long steel bridge with a central span of 35m and 7.5m approach spans at each end. The main girders consist of two existing fabricated beams (4.5m apart) owned by the contractor, which were modified to suit the site and application. The deck comprises sheet piles bolted to longitudinal members and the valleys between the sheets filled with concrete.
The second crossing at Kasese Creek, spanning a 17m deep gorge required a 56m long steel bridge with a central span of 30m and approach spans at each end. The main girders consist of two beams supported on piers fabricated from Favco crane towers. The piers, founded on cast in situ foundations, are spaced eight metres apart which enabled a temporary road to be built in between. This facilitated roadwork to continue while the bridge was being built. The deck comprises sheet piles bolted to the top flanges of the girders and the valleys between the sheets filled with concrete