Construction Project
North-South Connection Berlin-Starting Pit for Hydroshield |
Location
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Client
- DB Projekt GmbH Knoten Berlin
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Planning
- IVZ-Ingenieurgemeinschaft for the planning of transport facilities in the centre of Berlin, Emch und Berger, Schüssler-Plan, DE-Consult
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Investment volume
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Construction period
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Contracted services for BMG
- Section 55.8 HOAI-General construction management
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Structures constructed
- Construction of a deep and low-deformation trench for reception of the later tunnel structure
- Subterraneous curtains (T = 1.20 m) will be inserted up to 25.00 m
- Injection anchors will be used as grouted anchor to counteract the high soil and water pressure
- Excavators excavate the trench to the groundwater level
- Underwater excavation with floating excavators until the bed depth is reached
- Installation of the buoyancy anchors under water from the floating pontoon
- Pouring concrete under water using discharge pipes reaching to the bed
- The combination of the vertical subterraneous curtains and the concrete bed create a waterproof reinforced concrete basin
- Once the groundwater has been pumped out of the basin, the construction of the actual structure can begin
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Special features
- A structure subject to settling requires a low-deformation trench design.
- Counteraction of enormous bed pressures of 20 t/m² by using temporary buoyancy anchors
- Divers check the quality of the work
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Utilization
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Construction
- Design as curtain-bed construction using concrete impervious to water
- Subterraneous curtain area 13,000 m²
- Subterraneous curtain concrete used 20,800 m³/Underwater concrete used 10,000 m³
- Reinforcing steel used for construction 1,850 t
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