Track Bed of the New Basque Country Railway Network. Section: Hernialde Zizurkil

Track Bed of the New Basque Country Railway Network. Section: Hernialde Zizurkil

Location:

Guipúzcoa. Basque Country. Spain

Acciona’s Role:

  • Construction

Infrastructure:

Railway track bed L=5,870 m for 250Km/h. Double track, international gauge (1,435 mm). Track bed width 14 m. Ballastless track.

Most significant elements:

  • Viaduct over the river Hernialde: L=25 m. Post-tensioned lightweight slabs with a minimum depth at the edge of 1.60 m and a depth of 1.74 m on the slab axis. It will be constructed with full shoring, except on the section over the bed of the river Hernialde, where falsework will be used.
  • Viaduct over the river Alkiza: L=69 m (19.5+30+19.5). Post-tensioned lightweight slabs with a minimum depth at the edge of 1.65m and a depth of 1.79 m on the slab axis. It will be constructed with full shoring, except on the section over the bed of the river Alkiza, where falsework will be used.
  • Viaduct over the river Asteasu: L=404 m (34+3x49+50+3x47+32). Post-tensioned concrete box, with a maximum depth of 3.20 m. It will be constructed with a launching gantry.
  • Bored tunnels: Anoeta (L=1,370 m), Asteasu (L=2,557 m) and Zizurkil (847 m). The free cross-sections are 85 m2 para Anoeta and Asteasu, and 95 m2 for Zizurkil, although it has also been reduced to 85 m2. The vault and walls have a circular cross-section.
  • Ugarte cut-and-cover tunnel: L=268 m with a maximum overburden of approximately 13m.
  • Tunnel openings: Vaults supported on slabs, made from reinforced concrete with a variable depth created “in situ”.
  • Track slabs: Reinforced slabs measuring 9 m wide and 60 cm deep will be used as the base for the ballastless track on the open-air sections located between the cut-and-cover tunnel and the viaduct, as it is a short section.

Completion date:

  • 2018