Road bridge | Giubiasco-Sementina | 2008
Steel and concrete five spans bridge
Mancini & Marti SA
Arch.Anna Maria Torcelli; Castagnola
Passera Pedretti & Partners LTD, Biasca
Consorzio Officine Ghidoni SA – Ferriere Cattaneo SA
Renovation of the preexisting bridge by using a mixed steel/concrete structure.
length bridge: 233.50 m
Arched longitudinal section having an average radius of about 2’865 m.
Concrete flat arch total width about 13’360 m.
Total weight building 500 tons:
about 320 tons of S355K2G3 composite steel beams
about 140 tons of wings for the S460NL fine-grained composite steel beams
about 35 tons of S355 steel laminated-sectional cross beams
The beams are I-beams composed of a web and two wings (upper wing and lower wing), that are joined by continuous welding all along their length and stiffened by vertical plates (ribs).
The beams have been assembled in the workshop, they have been laid using a truck crane, on concrete piers and on temporary piers. Then they have been butt welded in the building site, minding the vertical curve of the bridge. The two main beams are linked by crossbeams equipped whether with composite section bars or laminates.
The central part of the main beams was preassembled over the submersible bank of the Ticino river and installed by using a huge truck crane, thus no disturbing the water flow and the fish fauna of the Ticino river.
The two central beams, in correspondence to the Ticino river, are about 43 m long and each one weights 47 tons. These two beams have been ground-assembled and, in one day only, they have been laid using a caterpillar crane having a capacity of about 5’000m.