Cologne Central Station, New Platform Roof

GERMANY
Cologne

Architect:
Busmann + Haberer, Cologne

Structural Engineer:
Polonyi und Fink GmbH, Cologne

A study was carried out to determine the best possible geometric form to cope with the uneven curve of the existing tracks and a narrowing towards the bridge over the Rhine. The best solution was found to be a combination of groined vaults supported at 29 points, arranged in a curved rhombic grid. Each module is rhombic in plan, some 20 m x 20 m in dimensions. From each column branch four truss-type half frames up to the ridge purlins linking with the next modules. Between these branches, a vaulted hollow section grid forms the mullions to which the glazing is affixed. No two modules are exactly alike; angles and lengths of all the different components vary, making the use of computer aided design and manufacture essential. In this way a highly individualised, mathematically complex solution was made cost-effective and manageable.