Technical specifications

Project description

  • 95 m preliminary cut, preliminary cut approx. 35,000 m³
  •  30 m north portal structure

462m tunnel constructed by the mining method:

  • Top heading and bench/invert heading in Tertiary hilly terrain
  • Spile canopy support system approx. 300 m
  • “Dry” tunnelling due to a substantial lowering of the groundwater table
  • Tunnel route runs partly through built-up areas

12 m shaft construction:

  • 2 tunnel blocks in open cut construction
  • Bored pile excavation (pile lengths up zo approx. 30 m)
  • Bracing at 4 levels and 2 excavation levels (tunnel / service building)
  • 179 m top-down method using bored piles

Deviations in geology identified subsequently:

  • Impacts: Bored pile design / bracing / foundation of stream crossings /
  • subsoil improvement in the Moosach area / additional time required / crossing of Moosach stream and construction of a diversion channel
  • 192 m open cut construction method with south portal structure and trough structure (ramp): Unstable soil (peat), consolidation fill requiring
  • a waiting time over 6 months
  • Underwater excavation partly in peat
  • Underwater concrete base anchored with Gewi piles
  • Inner diameter: approx. 10.4 m
  • Max. cover: approx. 10 m

Excavation cross-section: approx. 100 m²

  • Length = 328 m, A = 13.5 – 18.3 m²

Construction method
Conventional excavation after substantial lowering of the groundwater table, civil engineering structure constructed by the top-down method using boring piles, open-cut method and trough in bored pile excavations

Geology
Tunnelling using mining techniques in Tertiary hilly terrain north of Munich, top-down method and open cut construction in the transition area mainly in Quartenary soils, foundation lying on Tertiary soil

General data

Project
Tunnel Vötting

Client
City of Freising, Germany

Contractor 
Wayss & Freytag Ingenieurbau AG as technical leader of a Joint Venture

Construction period
2017 to 2021

Construction costs
58,84 Mio. € (total project)

Usage
Infrastructure
Type
Road tunnel
Length
850 m
Construction Method
Tunnel excavator, top down method, open cut method
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