as part of the development of the Saint-Philbert-De-Grand-Lieu Southwest bypass between the roundabout of Rd65 and that of the Rd70, the purpose of the work to be carried out is the construction of a hydraulic structure allowing the crossing of the future Rd861 of the creek “Le Verger” and a local hiking trail. The work to be carried out has the following main features፦ type of work: Open Gantry Underpass (Pipo) on piles - track range: 2x1 tracks 3.00 m and 2 uprooted bands of 2.05 m framed by service sidewalks supporting track restraint systems - crossed: a hiking trail and the stream “the Orchard "and its banks - right opening: 10.0 m - bias: 90 grades approximately - overall straight width: approximately 13.50 m (excluding cornice and canlevel-ledge)

market form: ordinary. Awarding of a single contract