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Spectacular bridge construction over Farris Lake in Norway

12. December 2017

PNC Norge and JV Partner – Implenia Construction GmbH joined together to build another bridge in the south of Norway

The Farris Bridge is part of a new section of the E18, four-lane motorway between Bommestad and Sky and is designed as a long horizontal curve passing around and over Lake Farris. The new bridge consists of two large abutments giving a total bridge superstructure length of 570m and a total “end to end” project length of 620m. Eye catchers are without a doubt the two separate 75m high “V”-form concrete pylons, on which the 120m long stay-cabled main span is hung from. One of the main challenges to face during construction was the drilling of thirteen piles with a diameter of two meters, down to 83 meters in the ground. Drilling such enormous piles into these extreme depths is a project, that has not been executed before in Norway. Overall, the installation of these piles alone took more than ten months.

Besides that, the foundation of the bridge was at the time the biggest foundation ever executed in a single casting on land in Norway, measuring ca. 48 x 20 x 4 m, ca. 4000 m3 of concrete and ca. 680 ton of reinforced steel.  A foundation of this size requires not only technical but also perfect logistical planning to ensure the strength of the construction and keep the schedule.

Since the Farris lake is an important resource for leisure activities and water supply for 200 000 people the Austrian Company PNC had to fulfill high environmental standards during the whole construction period, including permanent monitoring/sampling of the water quality.