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Rudower Heights Tunnel

A 6-lane motorway feeder Dresden BAB A 113 (new) is being built between the Berliner Ring BAB A 10 and the Stadtring Berlin BAB A 100 in conjunction with the Federal Transport Network Plan. A shallow tunnel structure for carrying out compensatory and substitute measures is being set up in the vicinity of Rudower Höhe as part of the scheme. In order to minimise costs, the gradient is located above the groundwater table but it does pass through a layer of meltwater sands in the second ground water conduit, which is separated from the main groundwater stratum by an impermeable layer. On account of these hydrogeological conditions, it was decided to execute the project using the wall and cover construction method. The walls are installed in the form of water impermeable diaphragm walls in the glacial marl that dams up the groundwater so that a trough is created, which prevents groundwater flowing into the excavation pit and the tunnel. The ceiling slab in the central axis is 1.50 m thick and produced as a roof profile with 1 % transverse gradient. On account of the fact that it is planned to cultivate the area above the tunnel, its ceiling is provided with a root protection system. The overburden at the centre of the tunnel amounts to a maximum of 3.50 m. The cross-section is designed as a 3-shaft, untensioned reinforced frame. The supporting width amounts to 2 x 16.75 m given a clear width of 15.00 m for the 3 lanes, each of which is 3.50 m wide, a hard shoulder of 2 m and an emergency footpath of 1.50 m. The outer walls and the central wall are each 80 cm thick. The diaphragm walls are provided with a 20 cm thick reinforced concrete cast-part shell on the inside. In situ concrete bases are setup in conjunction with the diaphragm walls in the impact area. The residual space between the diaphragm wall and the ready cast parts is used to lay pipes for protecting cables. The tunnel portals protrude some 6.50 m in the north and approx. 1.50 m in the south above the surface so they were produced together with the first 2 blocks by means of cut-and-cover. The tunnel portals are set up some 2.50 m above the tunnel ceiling for architectural reasons as well as to enable large traffic signs and display systems to be placed above the carriageways. The minimum clear height between the tunnel ceiling and the carriageway edge that is set higher amounts to 4.80 m, consisting of 4.50 m clear traffic area and 30 cm used for technical installations. The so-called air stream partition walls along the central strip, which link up with the 2 tunnel portals and the portal extensions (supporting walls), which peter out towards the sides are also integral parts of the project. The tunnel is to be furnished with substantial technical installations in accordance with the principles of the RABT including supplementary requirements and provisional specifications, which have already been put into practice in conjunction with the revision of the RABT and ZTV-ING, Part 5, Section 4.

 

  • Country: Germany
  • Region: Berlin
  • Tunnel utilization: Traffic
  • Type of utilization: Road tunnel
  • Client: Federal Republic of Germany - Land of Berlin
  • Consulting Engineer: Bung Beratende Ingenieure
  • Construction Monitoring: Hensellngenieure GmbH, Dorsch Consult
  • Contractor: Züblin Spezialtiefbau GmbH, Ed.Züblin AG, Kemmer Ingenieurtiefbau
  • Main construction method: Cut-and-cover
  • Type of excavation: Excavator
  • No. of tubes: 1
  • Tunnel total length: 1,000 m
  • Cross-section: total width 31.50 m, clear width per tunnel tube 15.00 m
  • Contract Volume: approx. € 25 million (roughwork)
  • Construction start/end: May 2004 to February 2006 (roughwork)
  • Opening: October 2007