Waste Incineration Plant Bern / Forsthaus West, Lot 1 Main Connection, Microtunnelling Nominal Diameter 3000

A passable tunnel for district heating, industrial water and electricity cable route was built between the old Bern waste incinerator plant and the new Bern-Forsthaus incinerator plant using the micro-tunnelling method. It was necessary to cross under the existing SBB Bern-Freiburg railway tracks.

Dismantling lengths:

  • Phase 1: approx. 486 m
  • Phase 2: approx. 30 m

Main Data

  • Nominal diameter: 3000 mm / 3600 mm
  • Pipe material: Reinforced concrete, single layer, 300 m
  • Length of pipe: approx. 516 m
  • Advance rate: approx. 12 m per day; max 22 m per day in 2-shift system
  • Gradient: min 3.0 %; max 30.7 %
  • Covering: min 5.0 m; max 14.0 m
  • Radii: Horizontal 500 m, vertical 2000 m
  • Use: District heating lines
  • Geology: Groundwater, gravel, backwater sediment, silt

Client

ewb, Energie Wasser Bern (energy and water utility)

Consultant

IUB Engineering Ltd. in consortium

Construction period

2010–2011

Construction costs

Approx. CHF 10 million, incl. 4 shaft constructions

Scope of services

  • Alternative study, preliminary project, detailed project for construction
  • Construction project
  • Tendering, bid evaluation
  • Project execution
  • Construction supervision