The Great Belt Link is 17 km and consists of three separate bridges, a tunnel and a road section on the island of Sprogø. The free span between the two pylons is no less than 1,624 m which makes it the third longest suspension bridge in the world. The pylons carrying the cables for the suspension bridge are 254 m high which makes them some of the highest structures in Denmark.
The challenge was to be able to deliver hot-dip galvanized guards with a film thickness of 150µ, providing corrosion protection for more than 25 years - while being able to resist the larger amounts of rain water which often contains sea salts. The Great Belt Link's crash barrier is exposed to considerable weathering from the Great Belt which means that the crash barriers will usually corrode significantly faster than on land. This means that the steel must be treated using the proper selection of zinc film thickness and dipping technology.
DOT's longstanding experience and expertise were selected to meet the specific challenges involved in a prestigious project as the Great Belt Link. Consequently, DOT offered professional guidance for the selection of steel, dipping technology and delivery of hot-dip galvanized crash barriers directly on the bridge to ensure a smooth installation process.
The useful life of the crash barrier depends in part on the design of the material and in part of wall thicknesses and so it required a professional partner with the professional expertise to qualify these selections. Here, DOT's experience with solutions for the marine industry and offshore industry was decisive to the collaboration of creating one of the largest bridges in the world.
Collaboration between the Great Belt project and DOT was efficient and the combination of high production capacity and a streamlined logistics solution was decisive. The Great Belt Link received 2x2x17 km = 68 km corrosion-protected crash barriers in corrosion class C-5. C-5 has an estimated useful life of more than 25 years in demanding environments with corrosive weathering.
DOT's delivery of the crash barriers covered a period of two years with on site deliveries on the actual bridge for quick installation. Overall, this collaboration has meant that we at DOT can declare ourselves an active co-creator of one of the largest bridge project in the world in recent history.