BMG GmbH & Co. KG - Keithstrasse 2-4 - D-10787 Berlin | Tel: +49 (0)30 2100220

PDB 78

Construction Project
New Railway Construction Ebensfeld-Erfurt - Tunnel Lohmberg
Location
  • Gehren (Thuringian)
Client
  • DB Netz AG
Planning
  • ILF Consulting Engineers and OBERMEYER Planen + Beraten GmbH, Munich
Investment volume
  • approx. EUR 12.0 million
Construction time
  • 12 months
Contracted services for BMG
  • Section 55.8 HOAI-General construction supervision
  • Construction management
  • Contract management
Structures constructed
  • Double track tunnel tube (L = 688 m) with a bore of 138 m2
  • Clear height/ clear width= 10.63/10.64
  • Maximum cover 60 m
  • Total excavated tunnel material 125,000 m3
Construction method
  • Excavation by means of blasting resp. heading
Special features
  • Safety concept by escape and rescue through the tunnel portals
  • Continuous pipeline for extinguishing water in the whole tunnel
  • Rescue places at the exits are linked to the transport system
Utilization
  • Long-distance railway tunnel (design speed= 300 km/h)
Construction
  • Full-circle mining of tunnel heading with graded heading face in accordance with the New Austrian Tunnelling Method (NATM)
  • Tunnel support system by means of support arches, reinforcing steel mesh, anchors, stakes and shot-crete (d = 15-20 cm)
  • Installation of a drainage to reduce ground and strata water pressure
  • Sheets for waterproofing collect and direct the mountain water outside of the internal shell via sidewall drainage lines in a controlled manner
  • Installation of a tunnel internal shell of water-proof concrete (d = 35-60 cm)
Geology
  • Solid rock of the volcanic rock complex of the Rotliegende (red sediment)
  • Igneous rocks, tuffs with sedimentary inclusions of clay, silt and sandstone as well as conglomerates
  • Rock is covered with weathered slope rock, on which quaternary river gravel was deposited in the valleys