DMA is currently developing the Detailed Design of the 4 km long Storström Bridge, Denmark.
The bridge carries two roadway lanes and two railway trucks, linking the island of Falster with the main island of Zealand. Its construction is managed by the Danish Road Directorate, Vejdirektoratet, together with the Railway Authority Banendanemark.
The contract for construction was awarded in February to the Italian Consortium led by Itinera S.p.A, comprising GLF and Condotte, and named SBJV, Storström Bridge Joint Venture.
The construction award came from a one year competition with other four international consortiums that with the method of the so called “Competitive Dialogue”, in which the competitors are called to prepare alternative designs and to discuss them with the client, in a multi-step dialogue in which all contract requirements are first prepared, then challenged and discussed, and at last agreed, before placing the bid.
The design proposal presented by SBJV, was conceived and developed by DMA during the Tender Phase.
This design is based on three main concepts: total prefabrication, that is of all structural elements; macro prefabrication, that is of very large elements; simple erection methods base on standard equipment, mainly in the disposability of JV.
The bridge includes a two spans central cable-stayed bridge, 320 m long, and two approach viaducts, with typical spans of 80 m, for a total length of 3832 m.
The height from sea of the main spans is 33 m. Horizontal loads up to around 79 MN have to be withstood, due to the due consideration of possible ship collision.
All structures are reinforced and prestressed concrete.
Deck structure is a monocellular box girder, with trapezoidal shape, internal trussed diaphragms, double level top slab.
The bridge design is carried on by DMA, with the contribution of the firms Andermann for landworks, SGI for geotechnical aspects and EKJ for environmental and safety aspects.
The project schedule foresee a three and half years for construction works, eight months of finishing and tests, with the final hand over of all the work in August 2022.