S. Miguel, Azores, Portugal
The Viaduct over the Mato da Cruz stream is located in the 3.1 Stretch – Barreiro/Algarvia of the São Miguel Island Concession, in Azores.
The Viaduct deck, with a total length of 172m between abutments, comprises 3 main spans of 35m each and 2 side spans of 33m and 34m, at the west and east side, respectively.
The deck consists of a flat slab 12,2m wide and 4 precast prestressed concrete I shaped beams, with both pre or post tensioned active reinforcement. These beams are placed in the course of a self-launching process by means of a launching girder.
The reinforced concrete piers are characterized by shafts and heads of the same geometry. Even so, depending on the location and according to the valley geometry, the shafts height varies between 29m and 54m. Cantilever abutments were defined as retaining structure. The piers and abutments are supported by either shallow or deep foundations.
One shall also emphasise that bridge is an example of a total of 10 viaducts with similar structural features, whose design projects were developed in partnership with another design office for this concession, with a total length of about 1400m.