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Subsequent damping without alteration of the bridge structure

The following images, photographs, illustrations, videos and media or "Subsequent damping without alteration of the bridge structure" include visual details and information about this product or case study.

Subsequent installation of vibration dampers on the Zinggen Bridge:Each of the two crane trucks in the background was used to heave one assembly basket and one damper underneath the bridge.

Subsequent installation of vibration dampers on the Zinggen Bridge:The damper is unloaded – and this is when the casing around mass and coil spring proves its worth: despite 90° rotation, the damper system does not get damaged.

Subsequent installation of vibration dampers on the Zinggen Bridge:From two sides, the crane jibs service the place of assembly at the bridge center: the damper is shown on the left, the fitters in the basket on the right.

Subsequent installation of vibration dampers on the Zinggen Bridge:Four perforated metal plates are vertically welded on as an auxiliary device for proper positioning of the damper. The crane pushes the damper upwards, hole by hole, alternating on the right and on the left; the plug-in rods secure the respective position.

Subsequent installation of vibration dampers on the Zinggen Bridge:For the vernier adjustment of the damper, hydraulic presses are used to ensure that the pre-drilled holes fit on top of each other precisely to the millimeter.

Subsequent installation of vibration dampers on the Zinggen Bridge:Once the dampers are firmly bolted, the perforated metal plates are removed.

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