German Unity Transport Project 8

Protection against vibration

Crucial importance is attached not only to protection against noise, but also to protect against vibration, so about 1500 m of track in the tunnel will be fitted with a mass-spring system. The permanent way and the tunnel will be separated by an elastic bearing. In conjunction with the elastic elements, the high, inert mass of the permanent way trough produces vibration isolation, so it is possible to minimise the creation of vibration.

(Graphic: DB AG)

Further intended anti-vibration measures are padded sleepers, where a damping pad is cemented to the underside of concrete sleepers. Ballast troughs will also be used on three of the four tracks on the Grossreuth curve. This means that all the ballast lies in a reinforced concrete trough, which is also lined with sub-ballast mats. In this way, the greatest possible level of vibration-proofing is achieved on the ballasted permanent way too.

The specific requirement for protective measures will be examined during construction of the fabric and following completion of the line, and adapted as necessary.

(Graphic: DB AG)