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FRANCE
MOTA‐ENGIL
IN THE PARIS METRO
THE CONSTRUCTION WILL SUPPORT THE EXPANSION WORKS OF THE EOLE LINE OF THE FRENCH CAPITAL’S METRO.
Mota‐Engil’s Prefabricated Unit is carrying out works in the President Paul Doumer pier, in Courbevoie, which will support the expansion of the metro line that will connect Avenue Gambetta, in the La Défense area, to the Railway Terminal in Haussmann Saint‐Lazare, Paris.
For the line’s expansion, the excavation process uses a tunnel boring machine (TBM). In this excavation process, the land removed is previously treated to create a more easily transportable pulp. In more usual conditions, the product of this excavation would be transported to the exit of the tunnel, where it
would temporarily be stocked and later
transported, usually by trucks, to its  nal destination; however, in this area, this process cannot be implemented since we are in one of the most congested areas
of Paris, both in terms of tra c and in terms of availability of space. In this case, and given the already mentioned constraints, the proximity to the River Seine was used to create an alternative solution for the seepage of the sludge, with the transport happening through a marinage duct to a temporary treatment and deposit plant, a facility for which this pier, now in construction, is intended.
Once stabilized, the removed soils go to their  nal destination in barges
through the River Seine, also providing environmental advantages, since, if it were feasible, the required movement of trucks would be very signi cant.
The contract, valued at € 433,470, provides for the supply of the prefabricated concrete elements, which, altogether, consist of 177 beams, with around 5 to 7 metres in length each.
This is yet another important work of
the Prefabricated Unit, in a demanding market and in which Mota‐Engil has been increasingly recognized for its quality.
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