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PDB 74

Construction Project
Underground Railway Frankfurt-Contract Section 72
Location
  • Frankfurt/Main
Client
  • City of Frankfurt
Planning
  • Metropolitan Railway Construction Office of the City of Frankfurt
Investment volume
  • approx. 50.0 million EUR
Construction time
  • 4 Years
Activities
  • Construction management
  • Contract management
  • Technical coordination
Structures constructed
  • Two single track tunnel tubes (length = 650m) 17 to 20 meters below ground with an excavation area of 38.0 m2
  • Launching pit in diaphragm wall construction and drilled pile walls
Special features
  • Lowering the groundwater below the pit bottom / tunnel bottom with gravity wells
  • Construction of the railway tracks as "Feste Fahrbahn" with high elastic camps between rail and concrete floor to reduce the impact sound
Utilization
  • Metropolitan railway tunnel of the City of Frankfurt
Construction
  • Full outbreak with gradated working face according to NATM (new Austrian tunnelling method)
  • Temporary support of the tunnel by arches, reinforcing steel and shotcrete (D = 15-20cm)
  • Inner shell of tunnel with water tight concrete (D = 25-40 cm)
  • Excavations by diaphragm wall construction and drilled pile walls
  • Tightness of pit by merging the diaphragm walls and drilled pile walls into carbon
Geology
  • Tertiary changing layers of sand, silt and clay with inlaying rock formations
  • In the upper range quaternary deposits