Scope of works performed
Lowering by 40 m on a swimming dock of the old steel structure (length of 121.10 m, weight of 1,465 t)Lifting of the new structure with same length and weight
Tilting operations to pass through existing supports by a combination of horizontal and vertical movements
Owner
Bundesministerium für Verkehr, Bau- und Wohnungswesen, Wasser- und Schifffahrtsdirektion NordEngineering + Main Contractor
Krupp Stahlbau HannoverEngineering Consultant
Prof. Sedlacek & PartnerVSL Entity
VSL(Switzerland) Ltd.Heavy Lifting Department
Date
2006Project Description
VSL Heavy Lifting removed the old center part of the historical bridge and lifted the new bridge in its place, saving existing supports.The historical train bridge, which crosses the Kiel Canal near Hochdonn, was opended for traffic on the first of June in 1920. Ever since, it was connecting the city of Hamburg with the island Sylt in the North Sea. Due to general deterioration of the main span and damages caused by two ship collisions, the center part of the bridge had to be replaced. The idea was to keep the existing support points of the main span and using them for the new part.
Because of that, there had to be found a method to pass the old 122 m long span through the clear gap of only 120 m between supports. This feat was realized by means of two special portal frames installed near the support axes.
Each frame was held back and adjusted to the required inclination by means of 2 VSL strand units SMU 220/550. Two strand units SMU 330/550 which were placed vertically in platforms and suspended in the upper part of the frame, allowed hooking up the span in 4 points. With this configuration it was possible to move the suspended span by about 2 m longitudinally and to incline it, which permitted lowering the span through the bottleneck between supports.
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