New Miribilla Station

Project Information: Construction of the New Miribilla Station, shafts and roadways: access, ventilation and emergency.

Vertical Shaft up to about 48 m depth from top and 135 m² section. 90 m long extended tunnel of cross section = 40 m².

457 m³ steel fibres reinforced shotcrete, 534 m bolts B – 500S Ø = 25 mm, 2,396 m bolts Swellex Mn24, 644 m fiberglass bolts Ø = 22 mm and 1,864 m² wire mesh.

Country: Spain

Province: Vizcaya

Place: Bilbao

Geometry:

  • Sección: Variable
  • Longitud: 1,072 m

Overburden: 48 m

Method of Tunneling:

  • Mechanical
  • Drill and blast
  • Raise borer

Geology and Geotechnical Data:

  • Marls, limestones, sandstones and lutites (Lower Cretaceous)

Tunnel Equipment:

  • Jumbo with two  booms
  • Ripper hammer
  • Raise borer.
  • Wet – mix Aliva AL – 285 η = 9 – 21 m³/h