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Organisationseinheit der BAM
- 7 Bauwerkssicherheit (82)
- 7.2 Ingenieurbau (82)
Eingeladener Vortrag
- nein (134)
Der Erhalt und die Weiterentwicklung der Verkehrsinfrastrukturen werden auch zukünftig einen Investitions- und Forschungsschwerpunkt in Deutschland bilden. Gemäß den aktuellen Entwicklungsprognosen sowohl der Bundesregierung als auch der Deutschen Bahn wäre bei unveränderten Marktanteilen der Bahn eine Zunahme insbesondere des Güterverkehrs in den kommenden 10 Jahren um ca. 50% zu erwarten. Dieser Zuwachs erfordert erhebliche Entwicklungen sowohl in der technischen Konstruktion der Fahrwege als auch im Erschütterungs- und Lärmschutz infolge des Schienenverkehrs.
The maintenance of the transport infrastructures and their further development are going to remain focal points for investment and research in Germany in future. According to the latest development forecasts made by both the federal government and Deutsche Bahn, even if rail´s percentage share of the market were to remain unchanged, growth of around 50% would be expected in the next ten years, especially in freight traffic. This growth is necessitating considerable development both in the technical design of the tracks and in the abatement of the noise and vibration caused by railway traffic.
There is a strong need for cost-effective mitigation measures for
turnouts. SBB has initiated a series of examinations using different methodologies to gain a deeper understanding of the excitation mechanisms at low frequencies, in addition to that obtained in the RIVAS project. To date it is not yet clear what constitutes a complete measurement data set that would enable understanding most of the vibration excitation mechanisms in turnouts. Increasing vibration at turnouts in comparison to normal track is observed for all measured frequencies.
The different methodologies are presented in the paper. Under-sleeper pads (USP) are a cost-effective method to reduce vibration at frequencies above 63 Hz (1/3 octave), but there is probably no improvement for frequencies below 63 Hz. A first test of new frog geometry did not show relevant improvements in Vibration emission in comparison to a reference frog geometry. Axle box acceleration measurements are an interesting method to identify defects in a turnout. A specialized measurement system of rail roughness could identify certain geometry Problem areas for some frogs. Noise increases also are observed at turnouts for frequencies ranging between 80 to 1000 Hz. The use of railway source models to calculate
contact forces for ballasted track and turnouts seems promising, in particular for understanding the influence of ground.