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Ilverich A 44 Rhine Crossing Rheinschlinge Tunnel, Strümp Tunnel

The Ilverich Rhine Crossing, as part of the northern bypass for the regional capital of Düsseldorf, closes the motorway ring around a densely populated economic region. The most important structures along the 5,900 m section are the Rhine bridge, with a total length of 1,289 m (including 288 m of River Bridge) and the Rheinschlinge and Strümp tunnels, which are built by cut-and-cover. On account of the anticipated traffic density of 75,000 vehicles/ 24 h in 2010, the cross-sections for both tunnels comprise 3 lanes and one hard shoulder per direction. Below a 1.0 to 6.0 m thick top layer of clayey to fine sandy silt, which in part contains mud deposits, varied gravel sands stemming from the quaternary up to 12.0 m thick are to be found. This layer is the main groundwater carrier. Underneath, tertiary fine sands are located, containing varying degrees of silt and which on account of their granular composition and bed density are poor conductors of the groundwater. Erratics of different sizes are to be found in both layers Depending on the Rhine's water level, the groundwater level reaches the surface. As far as choosing the gradient and the construction of the tunnels and troughs were concerned, the "20 year flood level" was taken as the basis adding on 0.5 m as a safety margin. A watertight excavation has to be created to produce the trough and tunnel cross-sections owing to the groundwater conditions which were described. In order to restrict the effects of the groundwater flow as far as possible, construction sections with a maximum length of 240 m are permitted. These are executed as back-anchored sheet piling walls, which incorporate the tertiary ground layer. The ingressing groundwater is collected in wells and returned to the subsurface via special seepage basins. In the construction dock that is created, 10 m long, two-cell tunnel blocks are produced from watertight concrete. The slightly inclined roof of the structure is provided with an additional seal beneath intersecting roads and in zones where the earth covering is < 1. The required stability against uplift is provided by the structure's own weight and, wherever necessary, through earth covering. The piling is drawn after completion of a section. The groundwater can pass below or given corresponding water levels, pass above the tunnel. The costs for building the Ilverich Rhine Crossing amounting to DM 450 million (including DM 220 million DM for the tunnels) are being privately pre-financed. The same applies to secondary costs of around DM 30 million (including those for acquiring land).

 

  • Country: Germany
  • Region: Nordrhein-Westfalen
  • Tunnel utilization: Traffic
  • Type of utilization: Road tunnel
  • Client: Bundesrepublik Deutschland
  • Consulting Engineer: Landschaftsverband Rheinland/lngenieurgemeinschaft A 44 Rheinquerung llverich
  • Contractor: Dyckerhoff & Widmann AG, Walter Bau AG, Heilit + Woerner Bau AG, Ed. Züblin AG
  • Main construction method: Open
  • Type of excavation: Cut-and-cover
  • No. of tubes: 1
  • Tunnel total length: Rheinschlinge 870 m, Strümp 640 m
  • Cross-section: each tubes: 3 lanes (each 3.50 m) plus hard shoulder (2.40 m)
  • Contract Volume: 220 mill. DM (roughwork)
  • Construction start/end: approx. 4 years
  • Opening: 2002