Clever solutions in ongoing operation

MEVA proves flexibility at the Sendlinger Tor in Munich

Data & Facts

  • Project:
    • Conversion of Sendlinger Tor underground station, Munich (GER)
  • Construction company:
    • Züblin Building and Infrastructure Bavaria
  • MEVA systems:
  • Planning and support:
    • MEVA Formwork Systems GmbH, Munich, Germany

 

Optimal in all areas

The underground station at Sendlinger Tor is one of the central nodes in Munich's transport network. The structure has been in operation since 1971. Every day, 150,000 passengers use the connections between the underground, trams and buses. Construction work has been underway since 2017 to make the hub fit for the future. MEVA is involved with a wide range of systems and know-how.

Andreas Scherzl from MEVA points to the cracks in the underground's vault, just 20 metres below the groundwater level: "The last 48 years have gnawed away at the substance of the structure. The concrete is damaged by seepage water." Only a few metres away from the massive special construction for an elm reinforcement (supporting concrete structure), the U2 rushes up to the platform. All the renovation work is being carried out during ongoing operations. This includes the tunnel breakthroughs between the two platforms, for whose support MEVA has developed its own special solutions. 

Work during ongoing operations
At the busy intersection at Sendlinger Tor, there have been several construction pits since construction began. Road traffic has been diverted and public transport continues to run as well. "For the complex project, implementation during ongoing operations means a great balancing act between adherence to deadlines, logistics, safety and space requirements," says the executing construction company Züblin. The option of temporarily shutting down even parts of the traffic junction in congestion-plagued Munich was out of the question for the client, Stadtwerke München.

Ground freezing
Four breakthroughs were made between the existing tunnel tube and the construction pit wall under the protection of a complex icing system in 7-day operation with day and night shifts. Formwork systems and scaffolding from MEVA were used to make the breakthroughs.

The pouring of concrete from the track
"Besides the above-ground construction measures with the STB 450 support brackets, our special construction for supporting the underground tube was probably the most interesting construction phase so far," Andreas Scherzl recalls of autumn 2017. In order to cope with the increasing passenger numbers, the underground connection between the underground platform tubes was extended by two connecting tunnels. The implementation took place during ongoing operations and partly at night when no trains are running. To secure the tunnel walls and ceilings, MEVA supplied a special construction for the supporting concrete of the new tunnel entrances and exits. Even the delivery and assembly of the construction was tricky. Things got really exciting during concreting. The concrete was delivered via a special transport wagon over the underground railway tracks and filled into the formwork.  

Optimal in all areas
In addition to various special constructions, three other MEVA systems are used according to the respective requirements: For the concreting in the large construction pits of Sonnenstraße, the STB 450 brace frames have proven their worth. Especially with formwork heights of up to 7.5 m, the flexibility of the system pays off, because the STB 450 attachments can be easily extended. This means that the system can be flexibly adapted to the height under the construction pit stiffener. MEVA's AluStar and StarTec formwork systems offer a major plus point in complex, sometimes underground construction operations. The systems are 100% compatible and, as a product family, combine crane-independent aluminium and large-format steel formwork. Particularly for construction sections under the slab, this offers great advantages thanks to the agile handling.