The Micheville link road, linking the Esch-Belval site in Luxembourg to Micheville in France, was completed by sliding a twin-tube tunnel weighing over 20,000 tonnes a distance of more than 50 metres.
To do this, the railway lines concerned were removed and then replaced afterwards.
The developer set our teams the challenge of shifting this tunnel in the space of just a few days, so as to limit disruption to the railway lines as much as possible.
We rose to the challenge, our teams moving the tunnel into its final position in just three days, or 72 hours - a world record!
10 months of preparatory studies and plans were required in order to successfully carry out this carefully organised operation.
60,000m² of earth was moved and a flat, guiding platform for sliding the tunnel was then put in place, after which the 67m long and 23m wide tunnel was constructed.
The earthworks phase involved 8 machines (mechanical diggers and bulldozers) and 14 lorries and dumper trucks, as well as a team of 15 people.
The 20,000 tonne tunnel was shifted in the course of a long weekend, during which the teams worked round the clock in order to complete the process in 72 hours.
The completed structure also comprised the exit stairwells on the French side as well as the technical buildings for each of the Central Gate batches in Esch-Belval.