Germany’s Hochtief and Swiss builder Implenia have won a €580m contract to cover a 2.2-km-long stretch of the A7 highway in Hamburg’s Altona district to create a new public space and lock in noise.
Allotments, greenery and parks will go on top of the motorway lid, which will also provide a car-free, walkable link between the districts of Othmarschen and Bahrenfeld.
Work is scheduled to take eight years, and will commence in April this year, Implenia said.Â Â
Hochtief will take the technical lead and holds a 65% share in a joint venture, while Implenia takes commercial lead and holds a 35% share.
Hochtief has built two other "Hamburg lids", and this will be the longest, the company said.
The client is DEGES, the German government’s highways developer.
Christian SpÃ¤th, head of civil engineering at Implenia, said: "We were able to identify numerous optimisation opportunities during the tendering process, which began in November 2019.
"This allowed us, among other things, to bring forward parts of the detailed design work and systematically incorporate the results of more than 30 coordination meetings into the project calculations.
"This meant we could significantly reduce the project risks for everyone involved and create a good basis for working together for the next eight years until the project reaches a successful conclusion."
Image: A visualisation of the A7 Altona Tunnel to be built in Hamburg, Germany (Supplied by Implenia)