01/2018 – 10/2020
This is part of a set of measures for improving the capacity and safety on the Fv.714 road, which connects the mainland Norway with the island of Hitra. The project includes a road section of a total length of 5.6 km, including a bridge over Åstfjord of a length of 735 m and 2 tunnels with profile T9.5 - Slørdal (2,650 m), Mjønes (770 m), as well as connections to local roads and bus stops with car parks. The project included a complete delivery, including electrical installations. Metrostav was responsible for the rough construction of the bridge, including foundation, reinforced concrete and steel structures of the bridge and tunneling, including the construction of both tunnels and the construction of the reinforced concrete portals.
The Project in Numbers
- 5,6 kmLength of the section
- 2 650 + 770 mLenght of both tunnels
- 735 mLenght of the bridge
- 80 m2Tunnel profile T9,5
- 13 500 ksAnchors
- 17 840 m3Concrete for individual structures
- 2 785 tReinforcement
- 2 660 tSteel structure
- 1 640 m, 210 mPosts, micro-posts
Exceptional Nature of Project
A unique combination of a pair of tunnels and a 735 m long eight-pole bridge over Åstfjord. The construction of the bridge involved, among other things, a unique foundation using reinforced concrete wells with a diameter of 18.4 m and a weight of 2,200 tons on the seabed, concreting of piers up to 40 m above the sea level and setting of a steel structure using a ship's crane.