The Syracuse-Gela Motorway on Sicily: DYWIDAG Strand Post-Tensioning Tendons for an important Part of the Road Network
The 133km long Syracuse-Gela Motorway on Sicily is an important part of the Italian road network that promotes the economic development of eastern Sicily. The new motorway will have 15 viaducts with a total length of 6,600m, 44 overpasses and 17 tunnels.
Lot 7 in the second section of the motorway includes the construction of the 629m long Scardina Bridge and the 1,474m long Salvia Bridge. Both viaducts consist of 54m long single spans.
In cooperation with Cosedil, the Owner Società Italiana per Condotte d’Acqua proposed the following technical improvements to the viaduct deck:
- increase of concrete strength from 45 MPa to 60 MPa
- change of precast segments length from 3.25m to 4.0m
- use of “short line match cast” technology for segment prefabrication
- launch of precast segments using the “span by span” method
- injection of the tendons using vacuum technology
For the viaducts, DYWIT supplied Type 22-0.62" DYWIDAG Strand Tendons with 1.280 MA Anchorages, Type 19-0.62" DYWIDAG Strand Tendons with 280 MA Anchorages and Type 12-0.62" DYWIDAG Strand Anchors with 330 MA Anchorages including accessories.
Furthermore, DYWIT provided all equipment needed for installation, stressing and grouting. In addition to the post-tensioning systems, DYWIT also supplied 20t of 28mm Ø GEWI® Rock Bolts for slope stabilization at the jobsite.