Civil Engineer Technology

The world’s first floating and largest tunnel – Norway

In civil engineering, Water tunnels are of course not new. There are approximately 100 submerge tunnels construct in water since 1900. In a few cases, the immersed tunnels are used to run below the sea or river bed. But when the bed is too deep, too rough, the submerged floating tunnel is employed.  

Norway starts the largest infrastructure project in its history, in order to better entry to cities across the nordic country. The Rogfast subsea tunnel is going to be about 27kms-long and 390m deep. It connects the city of scavenger and Haugesund. By building the new seaside highways, the government directs to remove all ferry crossing the E39 highway. The goal is to better attach the regions.

Now, traveling north-to-south across the country need eight ferry boat trips across the fjords valley. Norway’s fjords are too deep and too wide to hold up the bridges. The coastal highway improve will simplify future travels across the country. Because of these issues, many solutions are investigated by the government.

The project is looking ahead to get complete by 2023. There is an emergency lay-by to park the car in every 500m, and the floating tunnel is two interconnect tubes ties to the go over by using strong and resistance ropes. The emergency exit would be there in every 250m. The floating bridge consists of a large tube string under 100 feet of water, and each one will be broad enough for two lanes of traffic. Norway has committed $25 billion to construct the floating tunnel across the tunnel. 


The advantages of the tunnel project are:

The sub-aquatic bridge-tunnel allows the construction in very deep water. 

Low energy use due to more kind slope. 

No harm to the environment as the structure is cover inside the water. 

Construction activities is less dangerous to aquatic life. 

No obstacle to navigational routes compared to conventional bridges. 


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