rheda 2000® ballastless track system - RAIL.ONE GmbH

RHEDA 2000®1213Noise and vibrationprotectionNoise protectionFor significant reduction of airborne noise propagation,it is possible to install special noise-absorbersystems for ballastless track systems.This solution achieves good noise-engineeringparameters, even for half-surface installation inthe outdoor areas of the rails.Vibration protectionThe increase in train speeds, axle loads, andtraffic volumes on current train lines has also ledto increases in the noise and vibration to whichthe surroundings are subjected. Irregularitiesbetween rail and wheels, as well as the dynamicdeformation of tracks when rolling stock passes,introduce vibrations into the subgrade. Thesevibrations are propagated into adjoining buildingstructures, which vibrate to lesser or greaterdegree. Secondary airborne noise can likewiseproduce disturbances. One of the most effectivemeasures against the development of structuralbornenoise and vibrations is mass-spring systems.These systems attenuate the transmissionof vibrations into the surroundings. The characteristicsof the amplification function of singlemassoscillators play a key role in the design ofmass-spring systems. The use of mass-springsystems is advisable especially in densely developedareas sensitive to vibrations.Mass-spring systems can be implemented inlight, medium-heavy, or heavy models. Lightmass-spring systems are mounted on eitherstrip supports or entire-surface supports madeof elastomer matting. For heavy mass-springsystems, individual supports in the form of elastomerblocks or steel springs are employed. Thedeeper the frequency of the vibration to be reduced,the higher the required mass of the masstrack concrete layer. Here, the structure ofthe RHEDA 2000® ballastless track system offersbenefits to the entire system: the appreciablemass of the track concrete layer, with itsbi-block sleepers embedded in concrete, contributessignificantly to attenuation of vibrations.In addition, the RHEDA 2000® system – as a resultof its structural properties insensitive to waterand erosion – is well suited for applicationboth on open track sections, as well as in tunnels.As a result, many and various forms of themass-spring system are feasible: light, mediumheavy,or heavy models, with the respectively requiredsupport types of individual, strip, and entire-surfaceelastomer support.This great degree of design and adaptation flexibilitymakes the RHEDA 2000® ballastless tracksystem on a mass-spring system an optimal solutionfor satisfying all requirements placed on vibrationprotection and operational functionality.The RHEDA 2000® ballastless track system on amass-spring system has already been installedin numerous projects, in the form of variousmodels: e.g., in the Cologne-Bonn Airport Link(as a heavy mass-spring system), in the BerlinNorth-South Link (with light to heavy massspringsystems), and in the S-Bahn heavy-railurban transit system in Unterfoehring, on theoutskirts of Munich (light mass-spring system).Application of the single-mass oscillator principle in the RHEDA 2000® track type on a mass-spring system