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Through an architectural competition, the DTT has set itself the important and necessary objective of uniting all of its services in a single entity. The site chosen, the complexity of planning regulations in force and to come, the variety of functions to be sheltered make this project particularly interesting. The future users, the public and the professionals who will be received there and the surrounding urban fabric will say of the success of this ambitious project whose ecological vocation is clearly affirmed.


The idea of ​​a "light" intervention on the ground took shape, such as by lifting a sheet of land to slide a good part of the parking spaces below while freeing a large central garden square, a sort of plant space around which all functions are articulated. From then on, the "L" layout of the buildings was obvious, linear buildings crossed by large "faults" allowing the natural ventilation of all the main circulations. The construction thus moves away as much as possible from the noise nuisance to make way for a vast landscaped space centered on the entrance.


The creation of this half-level car park makes it possible to envisage an extension to the scale of the entire plot. This car park, which could be partially shared, would create nearly 400 spaces depending on the market program and free up rights-of-way for shops and services that could be developed.


The high spaces (hangar, education and road safety center) have found space at the ends, thus constituting, in particular the hangar, an effective barrier against the noise of the roundabout. The orientation relative to the prevailing winds allows efficient ventilation of the 2 wings of the building. The choice was made to propose a building of relatively modest height (maximum R + 2) in coherence with the future of an urban sector whose evolution still remains to be written.


The control of solar gains as well as the exposure to prevailing winds make it possible to minimize and optimize the use of air conditioning. For the same purpose, the reception hall and circulation areas are naturally ventilated. The materials have all been chosen according to their energy consumption in production and will be widely recyclable. It is planned to collect rainwater for the flushing of water and the irrigation of the large plant area in drip. All of the wastewater will be collected by the treatment plant and treated by rotary biodisks, rejecting quality water E, suitable for watering by infiltration and F for discharge into the natural environment.


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