Construction Project
Underground Railway Frankfurt-Contract Section 72 |
Location
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Client
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Planning
- Metropolitan Railway Construction Office of the City of Frankfurt
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Investment volume
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Construction time
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Activities
- Construction management
- Contract management
- Technical coordination
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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
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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
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Utilization
- Metropolitan railway tunnel of the City of Frankfurt
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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
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Geology
- Tertiary changing layers of sand, silt and clay with inlaying rock formations
- In the upper range quaternary deposits
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