N5 Solothurn – Biel, Tunnel Birchi

The Birchi tunnel is a section of the N5 highway in the Canton of Solothurn (N5/2 section Nennigkofen – Zuchwil.

Dati principali

  • Type of tunnel: double tube with 2 lanes per driving direction
  • Length: 2 x 1'400 m (2 x 700 m underground, 2 x 700 m open-cut)
  • Profile: horseshoe profile with bottom slab (in open-cut section base plate)
  • Excavation cross-section: 100 m²
  • Geology: lower fresh water molasse
  • Type of heading: pilot tunnel with partial excavation of roof section, face and invert, excavated with part-section machine
  • Stations: at both portals
  • Ventilation: longitudinal ventilation (jet ventilators)
  • Infrastructure: power supply, lighting, safety/ communication equipment, supply of water for fire fighting

Committente

Office for National Roads of the Canton of Solothurn

Progettazione

IUB Engineering Ltd. in consortium

Periodo di costruzione

1993–2001

Costi dell'opera

160 Mio. CHF

Prestazioni

  • Construction project
  • Tender and comparison of tenders
  • Execution project
  • Supervision of works
  • Documentation on the project

According to the terms of reference of the overall project management, the consortium - under the leadership of IUB (certified according to ISO 9001) - drew up a QC plan with annual audits for all partners (project work and supervision of works).