Structure-borne noise reduction in a railway tunnel in Cologne by means of a ballastless mass–spring-system-type Züblin with discrete Sylodyn® bearings and dynamically soft Sylodyn® ballast mats
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Medientyp:
E-Artikel
Titel:
Structure-borne noise reduction in a railway tunnel in Cologne by means of a ballastless mass–spring-system-type Züblin with discrete Sylodyn® bearings and dynamically soft Sylodyn® ballast mats
Beschreibung:
<jats:p>In the vicinity of Chorweiler (a suburb of Cologne) there is a tunnel in the double track of German Railways between Cologne and Düsseldorf which was built for airborne noise protection reasons. On both sides of this tunnel there are very close housing areas built during the last years. The structure-borne noise of the rail traffic caused a considerable interference with the residents. In 1997 measures to reduce the railway vibrations were installed in both tracks of a 970-m-long tunnel section. In one part of the tunnel, 230 m long, a mass–spring system with a natural frequency of 11 Hz, using discrete bearings, was installed. The rest of the tunnel was equipped with ballast mats tuned to extremely low dynamic stiffening and to main line axle loads (push–pull trains of commuter traffic Rhein/Ruhr) with a specific static stiffness of 0.03 N/mm3 [according to DB-TL 918071, Edition June (1988)]. The efficiency of these reduction measures, that means their insertion loss, was estimated by means of lumped-parameter models, and measurements of the structure-borne noise during train passages were carried out on identical measuring points before and after the structural alterations in the tunnel and in adjacent buildings. The measurement results show a good correspondence with the calculations and completely confirm the high expectations set in the measures.</jats:p>