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PDB 57

Construction Project
Underground Railway Berlin, Contract section D79
Location
  • Berlin-Reinickendorf
Client
  • State of Berlin-The Senator for Construction and Housing Berlin
Planning
  • Senate of the State of Berlin – Department VII
Investment volume
  • approx. DM 290.0 million
Construction time
  • 36 months
Activities
  • Construction management
  • Contract management
  • Technical coordination
Structures constructed
  • Starting and destination shaft in open construction with 120,000 m³ excavation
  • Emergency exit from the tunnels in caisson construction before the shield drive
  • Two one-track tunnels (L = 2 x 1,080 m) with 44,000 m³ tunnel excavation
  • Four-track tunnel rectangular cross-section in open construction (L = 219 m)
Special features
  • Shield tunnelling with a hydroshield (Øe = 6.50 m) for the line area in the tunnel
  • Stone catcher ahead of the feed pump and a sluice at the foot of the pressure wall simplify removal of obstacles
  • First-time use of a jaw-crusher in shield operation for automated removal of obstacles
  • Covering of the area shield line emergency exit using lean concrete for simplification of the shield travel
  • Minimal coverage between upper ground edge or building foundation and tunnel roof
  • Underground passage close to buildings as high as twelve storeys
Utilization
  • Underground railway tunnel of the City of Berlin
Construction
  • Single-shell expansion (Øi = 5.70 m) with reinforced concrete cassette tubbings
  • Tubbing ring width of 1.10 m, consisting of seven segment stones and one capping stone
  • Dismantable steel tubbings in the area of the emergency exit in place of the reinforced concrete cassette tubbings
  • Excavation pits in subterranean curtain construction with underwater concrete invert
Geology
  • High groundwater level up to 2.50 m under land surface and 4.50 to 7.00 m above tunnel roof
  • Primarily till
  • Layers of clay, fine and medium grade sands, gravel and rock inclusions