In 2005, the Norwegian Public Roads Administration began working on plans to replace a 6.4 km long section of the E18 motorway between Bommestad and Sky in Norway. The motorway was constructed in 1970 and was no longer able to meet the requirements of the ever-increasing road traffic. The plans involved constructing a four-lane motorway along the E18 past Larvik, between Bommestad and Sky, as well as a motorway bridge stretching alongside the Farris drinking water reservoir, and a number of long tunnel projects.
Ramboll was awarded the bridge construction, which the company won in collaboration with L2 Architects. The bridge is one of the largest bridge engineering projects for Ramboll in Norway and it was designed entirely in 3D. Bilfinger Construction was signed as the contractor for the bridge and express road construction in Farris. The contract assumes the construction of a cable-stayed bridge of a total length of 571.48 metres. The superstructure consists in the main span of a total length of 120 m constructed of two parallel steel boxes assembled to a reinforced-concrete plate, 75 m high pylons and two access viaducts of the lengths of 280 and 170 m, respectively, constructed of two parallel steel boxes. The construction began in 2014 and the bridge will be opened in 2017.
The piling was done by Kynningsrud AS, which uses its newly ordered 95-ton Junttan PMx28 for the job. The rig was delivered with two hammers to be able to finish both concrete and steel pipe piles. The bridge project included driving ø 914-mm steel tube piles and 300×300 concrete piles. The steel piles were driven with a Junttan HHK 10/12-ton hammer (max impact energy 176 kNm) at a 5:1 inclination. The concrete piles were spliced 13–18-metre piles and were driven with a Junttan SHK 5/7-ton hammer.
Kynningsrud has been very satisfied with the PMx28 and its driving capacity. The rig was delivered with Junttan’s remote diagnostics system, which has proven to very be useful in for instance hydraulics adjustment operations.
Sources: Ramboll, Bilfinger, and Norwegian Public Roads Administration
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