“A new gateway to the Mestre-Venice urban system”
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Porto Marghera (VE)
2017 – in corso (progettazione definitiva ed esecutiva completate, DL in corso)
Comune di Venezia
Final and detail design, Safety Coordination during the Design and Construction phases and Work Supervision
Road design, structures, environment, construction site, computation
The project envisages the construction of a new staggered intersection along the current SR 11 – Via della Libertà, the only access road to the island of Venice. The aim of the project is to improve accessibility to the Macro-island First Industrial Area of Porto Marghera (an area undergoing reconversion and strong development) and to increase safety along the roadway thanks to a clear separation between crossing and local flows.
Accessibility is achieved with a new large roundabout at the current access to Fincantieri (Via delle Industrie), connected to both SR 11 and the urban road network in Mestre (Via Torino). The traffic will pass over the roundabout with a viaduct and then enter the artificial tunnel (completely above ground). Above the tunnel deck a further elevated roundabout is planned, connected to a one-way ramp which will allow a direct route Mestre (Via Torino) – Venice. This manoeuvre, which is not allowed by the existing viaducts on Via Torino – which will be partially demolished and structurally adapted – will improve the Mestre-Venice connection and will have a positive impact on the currently congested local traffic.
Considering the complexity of the project, characterised both by a very articulated geometry and by the presence of numerous constraints, it was decided to develop the entire final and detailed design through an integrated B.I.M. process, in line with recent guidelines.
MAIN AXIS VIADUCT AND CONSTRUCTION PHASES
The design solution is based on the need to:
The response to the above requirements was expressed in this proposal, which envisages the construction of a closed double deck viaduct in self-protecting steel left exposed with an “integral” design (i.e. with the deck attached to the vertical supports and therefore without any restraining devices) arranged in continuity over four spans in the sequence 36m + 50m +36m +36m.
The piers are also made of self-protecting steel, and are composed of twin shafts that branch off at the top to support two adjacent twin decks and join at the foot, forming a “V”, in the section of insertion in the foundation with which they are integral.
LANDSCAPING OF THE WORK
The design choices were shared with the Superintendent’s Office, who requested:
The intervention area is subject to: