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Munich Underground Railway, Line 6/3, Contract Section 15.1, Platform Expansion for Marienplatz Station

The Marienplatz Underground Railway Station in downtown Munich was provided with 2 additional parallel running platforms within the scope of the infrastructural measures for the 2006 World Cup and the new Allianz Arena football stadium. A special proposal that foresaw ground freezing was applied: the upper tertiary water-bearing sands as well as layers of marl in the crown area of the subsequent tunnel were frozen so that the drive could be carried out without the intrusion of water. The water table was lowered by means of wells in the deeper sand layers so that the two 90 m long tunnel tubes could be excavated under atmospheric pressure using a NATM drive. The 654 bores for the freezing tubes were undertaken from pilot headings, which were arranged above the subsequent tunnels. These pilot headings were produced under compressed air with a cowl shield through pipe-jacking. The entire scheme was backed by an extensive measurement programme as it had to be assured that the historic Rathaus sustained no damage as a result. Particular attention was paid to ground freezing regarding frost heaving and thaw settlement. Thanks to intermittent freezing and the building up of a frozen zone commensurate with the rate of advance, it was possible to confine the deformations. After driving was completed, work on the breakthroughs to the existing platforms was executed. Altogether, 1,500 m³ of reinforced concrete with average thicknesses of 2 m had to be installed for the 11 breakthroughs. For static reasons, the support frame was installed in defined construction phases and sequences in conjunction with the excavation. Self-compacting concrete was applied for the frames in the top cover zone on account of the greater thickness of the components and the high degree of reinforcement. The permanent lining was produced from watertight concrete. The connection to the existing platform tunnels was executed using clamping joint constructions. Emergency exits were produced in the starting shafts.

 

  • Country: Germany
  • Region: Bavaria
  • Tunnel utilization: Traffic
  • Type of utilization: Underground, urban and rapid transit
  • Client: Regional Capital of Munich, Building Department, Underground Railway Construction
  • Consulting Engineer: Design: Regional Capital of Munich, Building Department, Underground Railway Construction; Execution: Schmitt, Stumpf, Frühauf und Partner
  • Contractor: Max Bögl Bauunternehmung GmbH & Co. KG
  • Main construction method: Trenchless
  • Type of excavation: Drill-and-blast/Shield machine (SM)
  • Lining: Concrete formwork
  • No. of tubes: 2
  • Tunnel total length: 2 platform tunnels, L =100 m protected by a frozen zone (5,000 m³); 2 oval starting shafts made of overlapping drilled piles,depth = 32 m; 2 pilot headings, d = 2.4 m, each 100 m long driven by compressed air shield
  • Cross-section: 50 m²
  • Contract Volume: € 19 million net (roughwork)
  • Construction start/end: May 2003 to March 2006
  • Opening: 2006