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Tunnel approach for the A26 Danube Bridge, Linz, Austria


ロケーション: Linz, オーストリア

  • The A26 Danube Bridge construction project is one of the most important infrastructure projects in the Austrian city of Linz and the surrounding area as the city looks to ease congestion on its transport network
  • PERI assisted with the construction of the 1,600-m-long access tunnels for the new A26 suspension bridge over the Danube
  • A large section of the tunnel runs underground so that the noise and pollution in the urban area are reduced to an even greater extent
  • Construction of five different tunnel cross-sections with profile transitions and tight radii of between 50 m and 750 m in the bends as well as varying gradients 


  • Solution-oriented and collaborative working methods with a concept that results in the greatest possible degree of optimisation
  • Construction work included very tight bend radii and varying tunnel gradients
  • Strict construction schedule
  • High demands on occupational safety


ICM construction GmbH, Vienna, Austria


  • The project solution was tailored to all the customer’s needs, combining an innovative and economical solution with outstanding product quality and customer service
  • Rapid construction progress due to fast shuttering procedures and optimum use of the formwork systems on the construction site
  • The formwork carriage was moved swiftly to the next concreting section thanks to innovative caterpillar system
  • The project was completed on schedule
Portrait of Francesco Jusufi, Site Manager, ICM construction GmbH, Vienna, Austria
Francesco Jusufi
Site Manager

Due to the complex geometric conditions as well as other challenging constraints, during the tendering process we were looking for a concept that would result in as much optimisation as possible. PERI was intensively involved as early as the planning stage, providing solution-oriented input. When it came to the operational implementation stage, there was constant communication between the parties, which meant that the formwork systems could be used in the optimum manner on the construction site.


  • Austria’s first customised and fully hydraulic special-purpose steel formwork carriage was developed, featuring a caterpillar drive and weighing 250 t
  • Dimensions of the formwork carriage: 8.07 m high and 14.50 m long, not to mention 10.70 m wide when ready to move and 11.20 m wide when ready to pour concrete.
  • An innovative caterpillar system was used to move the formwork carriage due to the tight bend radii
  • Only one formwork carriage was required to produce the different cross-sections in a total of 170 concreting sections
  • Extensive project support from PERI engineers with solution-oriented planning input and continuous dialogue between the project managers
  • The formwork carriage was assembled in front of the tunnel entrance under the guidance of a PERI supervisor
  • A mobile, 6-m-long assembly carriage with rubber tyres and electric motor was used for the sealing work
  • This was followed by a reinforcement carriage adapted to the block length of 12 m, the principle of which is similar to the sealing carriage. Both carriages consisted of a stable VARIOKIT base frame on which a PERI UP scaffold, adapted to the cross-sections, was erected
  • This PERI UP scaffold was used as a work platform