to accommodate deflections and erection geometry restrictions.
Upon completion of the steel box girder,
the lower concrete slab inside the box in the
regions of negative moment was cast in place.
The pylons’ segments were then lifted, assembled, and partially filled with concrete. Erection continued
with the installation of the curved diagonal members. These
components were split into six segments in the central span
and were installed using temporary props on top of the box
girder to ensure proper alignment and stability. Jacks were
placed and used for elevation control and height adjustment.
After the central curved steel ties had been correctly placed
and welded, the rest of the segments were lifted using four
temporary supports for each of the remaining curved steel elements. Once the connections were completed, all of the temporary elements were
removed in a specified order.
The erection and assembly procedures unfolded in complex stages that
required comprehensive geometric control. While the tied members were being welded, the precast panels for the top
slab were installed. Once all of the panels
were installed, the reinforced top slab was
poured. After the slab reached its proper strength, the temporary supports under the box girder were removed in a specified sequence.
The steel bridge erection was completed within the allotted time frame and thus did not affect the project schedule.
Finally, a static load test was carried out in order to check the
The bridge was opened to traffic on March 31. The
structure is a significant achievement for
the community and promises to support
the economic and population growth of Gi-
rona. Its beauty and grace are sure to make
it a source of pride for the community for
many years to come.
This project makes clear that the aesthetic properties of a
bridge are as important as efficiency, economy, sustainability,
and constructability. Bridges, as enduring facets of infrastructure, modify the landscape, and their influence in the life of
various generations is something that we cannot forget during planning and design. Steel bridges offer great aesthetic
possibilities to designers, aside from the benefits they confer with regard to constructability and sustainability. If each
bridge is unique, why not explore the enormous opportunities in steel construction now open to us
with the use of computer-aided design
tools, three-dimensional models, and numerical control techniques? CE
Juan A. Sobrino, Ph.D., P.E., P.Eng., CEng,
M.ASCE, is the founder of Pedelta and the
director of the firm’s North America operations,
working in the Miami office. He served as the
engineer of record on this project. Javier Jordan,
P.E., P.Eng., also in the Miami office of Pedelta, was the project’s
PROJECT CREDITS Client: Ministerio de Fomento,
Spain Bridge design: Pedelta, Barcelona, Spain, office
Contractor: Dragados, Madrid, Spain, office Steel subcontractors: Ascamon, Asturias, Spain, and URSSA, Vitoria-Gasteiz,
The bridge crosses an environ-
mentally protected riverbank
habitat, requiring an overall
length of 485 m and a length
for the main span of 120 m.