Construction Project
Underground Railway Essen - Contract Section 32/33 |
Location
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Client
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Planning
- Metropolitan Railway Construction Office of the City of Essen
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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
- Starting shaft in open construction with 18,800 m³ shaft excavation
- Two one-track tunnels (L = 3,400 m) with 100,000 m³ tunnel excavation
- Two emergency staircases sunk in caisson construction
- Two stations in open construction
- Destination shaft with NÖT tunnelling (L = 248 m) under compressed air
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Construction method
- TBM as earth pressure balanced shield (EPB)
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Special features
- Tunnel shield method using the earth thrust principle for the line area in the tunnel
- First-time use of an earth-thrust shield in Europe (Øe = 7.12 m)
- Immediate support of the rock mass by the use of extrusion concrete capable of flowing easily under high concrete pressure during concrete installation (hydraulic presses)
- Spray concrete construction under compressed air in station area
- Use of tunnelling excavator
- Tunnelling using New Austrian Tunnel construction method, making use of reasonable cross- section breakdowns
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Utilization
- Underground railway tunnel for the City of Essen
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Construction
- Provisional expansion of the tunnel line using extrusion concrete (d = 30 cm)
- Installation of a tunnel inner shell using concrete impervious to water
- Tunnel inner shell in station area out of steel fibre concrete (d = 35 cm)
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Geology
- High groundwater level
- Drastically changing levels of the individual ground levels of clay and water-saturated silt
- Organic elements and mud inclusions
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