San Sebastián (Guipúzcoa) | 2018

The San Sebastián City Council called a competition for the construction of a new bridge over the Urumea River in the Loyola neighbourhood to replace another old and in poor condition.

Our proposal offered a powerful qualifying image of the environment. The place was to be transformed after the construction of the work. A cable-stayed bridge with a steel pylon leaning over the river with a restraining cable that evoked “sokatira”, the popular sport in Gipuzkoa of “rope pulling“.

The bridge, with a single plan of cables, had a width of 18 meters of the deck, on which were located, on one side, two lanes for road traffic and a sidewalk for pedestrian traffic, on the other side, another sidewalk along with a bike path.

The execution and commissioning process were studied in 9 phases:

  • Phase 1. Construction of the foundation. Piles, sheet piling, pile caps and drilled shafts.
  • Phase 2. Placing the steel box of the deck over the river with cranes.
  • Phase 3. Placement of the pylon with a crane.
  • Phase 4. Cable routing and first stressing.
  • Phase 5. Laying of central precast slabs and concreting of the concrete slab of the central section. Second cable stress.
  • Phase 6. Assembly of precast slabs on ribs and concreting of the lateral overhangs.
  • Phase 7. Third stressing of support cables and adjustment of back-stayed cables to compensate for permanent loads.
  • Phase 8. Placing dead loads, checking loads on cables and restressing.
  • Phase 9. Demolition of the old bridge.

Finally, no new bridge was built, and the old bridge is still in service.


Project Author ESTUDIO AIA
Location San Sebastián (Guipúzcoa)
Promoter Ayuntamiento de San Sebastián (Guipúzcoa)
Project date 2013
State Competition