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East Collector, Hamburg, Central Section, 1st Contract Section South

The Ölmühlenweg pump station in Hamburg-Wandsbek with its pressure pipeline was commissioned in 1968. It carries the wastewater from the north-eastern suburbs of Hamburg and neighbouring localities with a catchment area of 350,000 inhabitants. In the interim the facility's capacity has been reached. In order to avoid waters being contaminated and to be in a position to carry sewage to the clarification plant via an open water gradient, the east collector is being built. The 3,280 m long structure is being produced underground by pipe jacking at depths-varying from 10 to 20 m in the Hamburg-Horn district, an inner urban residential quarter. Two tunnel boring machines were utilised. The bulk of the route was excavated using a tunnel boring machine with a shield drive and fluid supported face. The other part of the route was driven by means of an open hood shield supported by compressed air on account of the presence of steel obstacles predicted in the excavated cross-section. Single-section reinforced concrete pipes (precast parts) were used, which possess a wall thickness of 18 or 22 cm depending on the tunnelling machine. Individual lengths ranging from 3 to 4 m and with a minimum concrete strength class of C 45/55 highly resistant to chemicals were used. The longest column driven in one go amounted to 1,042 m. On account of the conditions inside the sewer, which act aggressively against concrete, the pipes were provided with a PEHD inliner at the factory. Polygonal concrete diaphragm walls with an underwater concrete base back-anchored in the walls were used for the access and target pits. The subsoil is divided up into 'Marsch' (Elbtal valley) and “Geest". In the Marsch there are soft layers of clay, mud and peat close to the surface, with glacial sands below them. The Geest zone possesses rubble soils (marl, loam), sands, basin deposits and erratics as far as layer structure and thickness is concerned. The groundwater level amounts to between 2 and 3.5 m below sea level. After concluding the driving operations concrete pipes are sunk to the tunnel cross-section as fluted shafts and welded on to special driving pipes with steel jackets under compressed air. These shafts serve as inspection shafts for the future sewage collector. In the 7 access/target excavation pits operating shafts are produced from reinforced concrete with walled clinker gutters for operational and diversional purposes. The sewage collector is due to be commissioned after completion of the 2nd contract section in autumn 2010 to replace the Ölmühlenweg pump station.


  • Country: Germany
  • Region: Hamburg
  • Tunnel utilization: Utilities
  • Type of utilization: Sewage Transport Collector
  • Client: Hamburger Stadtentwässerung
  • Consulting Engineer: Hamburger Stadtentwässerung
  • Construction monitoring: Hamburger Stadtentwässerung
  • Contractor: JV Sammler Ost; Ed. Züblin AG, Direktion Tunnelbau/Züblin Spezialtiefbau GmbH
  • Main construction method: Trenchless
  • Type of excavation: Shield machine (SM)?
  • Lining: Reinforced concrete pipe?
  • No. of tubes: 7?
  • Tunnel total length: 3,280 m
  • Cross-section: 1.80 m (internal diameter), 2.16/2.24 m (external diameter)
  • Contract Volume: approx. 15 mill. euros
  • Construction start/end: 2006 till end of 2009
  • Opening: 2010