rheda 2000® ballastless track system - RAIL.ONE GmbH

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RHEDA 2000®1011Additional system solutionsTurnouts with optimized structuraldesigntechnologyWith the objective of end-to-end system engineeringfor tracks and turnouts for the RHEDA2000® ballastless track system, extensive adaptationto reduced track structural height representedan essential step in sleeper design.The key aspect of this development was designand dimensioning of a concrete turnout sleeperbased on the B 355 bi-block sleeper. The GWS05 lattice-truss turnout sleeper currently representsthe optimized state of system development.With its end-to-end system engineering,this sleeper assures effective provision of the recessesbelow the base of the rail that are necessaryfor the turnout drive, as well as the contin-uous reinforcement of the track concrete layer(approximately in the centre of the track crosssection).This solution achieves homogeneousheight configuration in track and turnouts, andcorrespondingly reduces the weight involved.For project engineering and installation on theconstruction site, this means considerable timesavings and cost reduction. The uniform systemsengineering features allow integration of alltrack substructure variations and conditions intothe design. In Taiwan, for example, RAIL.ONE implementedcomplete train-station systems witha great number of turnouts and platform connections,on viaducts by means of pile-supportedconstructions, or in tunnel areas.Rail expansion jointsThe turnout sleeper for the RHEDA 2000® ballastlesstrack system also offers a safe, reliable,robust, and at the same time flexible basis forvarious types of rail expansion joints. The GWS05 sleeper is the heart of the system, and providesstable, requirement-satisfying, and exactmounting points - especially for the respectiveinstallation components of a rail expansionjoint. The monolithic concrete track layer canbe adapted to the special requirements encountered,especially in the immediate vicinity of thebridge joint. A number of major projects have alreadybeen planned and executed in the RHEDA2000® system with special transition elements.subsoil
TransitionsThe installation of ballastless track systems demandsspecial attention for the transitions betweenballasted and ballastless track systems.With the RHEDA 2000® system, numerous system-optimizeddetails enable stiffness adaptationin the rail fastenings and in the ballast, at suchtransitions from ballastless to ballasted track.As a rule, these solutions include the first step ofmultistage gluing of the ballast, in addition to anextension of the hydraulically bonded layer. Thistechnique increases the stiffness of the ballastedtrack system. In addition, a special pre-stressedsleeper with highly elastic rail fastening is installedin the ballasted track. This arrangementenables an increase in stiffness, in several stages,between the ballastless track and the ballastedsection. As an option, it is also possible to configureauxiliary rails: both for these special turnouts,as well as on the ballastless track. This likewisereduces the difficulties otherwise encountered atthe interfaces between ballasted and ballastlesssections. The RHEDA 2000® system accordinglyoffers an optimal solution, with uniform systemengineering for all areas of application.Road-Vehicle Access SystemNew safety regulations in Europe stipulate thataccess for vehicles must now be ensured in railwaytunnels for all types of road vehicles (passengercars and lorries). As a result, a road-vehicleaccess system was developed for the RHEDA2000® ballastless track system. As an adaptivemeasure, this access system can be installed directlyonto the track. The emplacement of precastconcrete slabs onto B 355 bi-block sleepersprovides an operating surface for road vehiclesat a defined level below the top of rail. This developmentallows passenger cars and lorrieswith up to 10-tonne axle loads to use the surfaceas a roadway without restriction. An additionaladvantage of the precast parts results from thefact that smaller connecting elements in the vicinityof the rails and the rail-fastening elementscan be removed to allow easy performance ofobligatory maintenance on these components.Electromagnetic compatibility (EMC)Ballastless tracks, with their reinforced concretelayers, have substantial electromagnetic properties.In their development, it is necessary to considereffective measures against lightning andcatenary line breakage. These measures involvegrounding elements (equipotential bonding).Modifications or extensions necessitate regularinspection of these elements.In high-speed rail traffic, unrestricted compatibilityis absolutely essential between train controlsystems and the ballastless track. Controlsystems operate with transmission systems anduse electromagnetic signal transmitters and/orsignal receivers. These control systems functiondirectly in the reinforced-concrete track layersthemselves (e.g., LZB and ETCS), or in the directvicinity of these layers (e.g., UM 71 etc.). It is crucialto study the effects of longitudinal reinforcement,since it represents the primary attenuatingelement.The RHEDA 2000® system has been tested forthe most widely employed train control and managementsystems: i.e., for the LZB in Germany,the ETCS trans-European high-speed train network,and the UM 71 in France and Asia. TheRHEDA 2000® system has been approved as observingthe respective stipulated parameters.On the basis of its simple structure and constructionmethods, it is possible to quickly andeconomically conform to all the requirements oftrain control systems now in use.
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rheda 2000® ballastless track system - RAIL.ONE GmbH

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