Scope of works performed
• Heavy lifting• Post tensioning
CLIENT
Max Bögl Stahl-und Anlagenbau, NeumarktARCHITECT
von Gerkan, Marg und Partner, BerlinENGINEERING CONSULTANTS
Schlaich Bergermann und Partner, StuttgartSTRAND JACKING OPERATIONS
VSL (Switzerland) Ltd.VSL Entity
VSL (Switzerland) Ltd.Heavy Lifting Department
Date
2004Project Description
During June and July 2004, one of the most spectacular roof structures in the world was lifted into place over the newly renovated ‘’Waldstadion’’ in Frankfurt. A tremendous time pressure was on the installation works, as only the break in the football season was available to get the roof anchored in its final position.
The roof consists of a double layered cable net structure, which will later be covered by a membrane. 44 radial cables are anchored on the compression ring running over a length of 709 m around the top of the stands. 35 m above the centre of the field, all 44 cables are anchored in a massive central node. Today a video cube with 10 m long sides is hanging there.
The 9,000 m2 central part of the roof can be retracted and folded inside the cube within 20 minutes. Because of this feature the stadium has been dubbed the biggest ‘‘convertible‘‘ in the world.
The equipment was then reset for the pulling and tensioning of the lower radial cables. The total pulling capacity of the entire 88 units exceeded 21,000 t. The temporary struts at the compression ring were removed when there was about 1 m left to pull. In this final stage, all 44 cables had to be pulled simultaneously within millimetres to avoid overstressing the compression ring.
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