How to build the Fehmarn tunnel
The Fehmarn connection is being built as a submerged tunnel between Rødbyhavn on Lolland and the German island of Fehmarn. Unlike a drilled tunnel, a submerged tunnel consists of hollow concrete elements cast ashore and assembled one by one until they form a tunnel.
To build the Fehmarn connection, a trench must first be excavated in the seabed, in which the tunnel must lie. This gutter becomes up to 60 meters wide, 16 meters deep and 18 kilometers long. A total of 19 million is to be dug. cubic meters of rock and sand from the sea floor. The land is used to create approximately 3 square kilometers of new natural areas on Lolland and to a lesser extent on Fehmarn.
Read more about the new land areas on Lolland here.
When the gutter in the seabed is ready, work on placing the tunnel elements can start. Each tunnel element weighs 73,000 tons, but as they are hollow and sealed with bulkheads, they can float in the water. Large tugs pull the elements out into the Fehmarnbelt, where they are lowered to the seabed with great precision and put together.
When the tunnel pipe is in place, the technical installations must be completed. These are the rail rails for the electric trains, communication systems, lights, ventilation, transformers and pumps. As a change in relation to the Øresund tunnel, the Fehmarn tunnel will receive 10 special elements with an extra basement floor.
A special element will be placed for every approx. 2. kilometers of the tunnel where equipment for operating the tunnel is placed. This means that the Fehmarn tunnel will be cheaper and easier to maintain, while saving large amounts of concrete because the standard elements can be reduced.
See more and current content about the Fehmarn building HERE