Refurbishment of Hauenstein Base Tunnel

Scope of works for the refurbishment of the Hauenstein Base Tunnel (GU+ contract):

Construction works:

• Refurbishment of the tunnel lining in areas with significant damage
• Refurbishment of the ventilation shaft, including head and base structures
• Renewal of the track with invert lowering
• Renewal of crossovers with invert lowering
• Local refurbishment of side drainage and selected central drainage chambers
• Addition of one incident retention basin in each of the two portal areas
• Excavation and construction of 7 new railway service chambers
• Installation of a one-sided cable duct and redesign of the escape route on the side of track 100
• Renewal of cables, technical systems and control system (LSS – CH)
• Renewal of self-rescue systems (handrails, emergency lighting, signage) on the side of track 100, including extension to the open line up to assembly points
• Installation of additional earthing loops

In connection with the above construction works, the contractor provides the following services:

• Preparation of the execution design (Phase 51 according to SIA 103/112)
• Site supervision (Phase 52 according to SIA 103/112)
• Commissioning and project close-out (Phase 53 according to SIA 103/112)
• Coordination of SBB services during the execution design and construction phases
• Provision of logistics and ensuring safety in the tunnel for SBB services and third-party contractors

• Overall Project Manager: Lukas Herburger
• Head of Design – Cables & Technical Systems: Michael Krös (Epro Traffic)
• Head of Construction – Civil Works / Tunnel Works: Marco Würsch / Michal Szymanski
• Head of Construction & Commissioning – Cables and Technical Systems: Marsel Sljivo
• Head of Track Works: Ramazan Sönmez
• Site Management & Overall Coordination: Melissa Preschan
• Construction Manager – Civil Works External Areas: Marco Würsch

• All construction works are carried out by internal companies of the Rhomberg Sersa Rail Group; exceptions are slipform works in the ventilation shaft and waterproofing works
• Refurbishment of a 134 m high vertical ventilation shaft
• Obtaining various approvals from the Federal Office of Transport (BAV) and SBB for combined vehicle-machine operations

All works – except for the turnout replacement in the crossovers – are carried out while maintaining 24-hour railway operations on the adjacent track (track spacing 3.6 m). Construction works are limited to night-time possessions (typically 23:00–06:00) on the construction track. During daytime, both tracks in the tunnel remain fully operational.