Up to now most of the ballastless track systems, which have been built on Ballastless track systems using discrete rail seats as well as systems with sleeper . The Group (formerly ‘Pfleiderer track systems’) was involved from the earliest days in a leading role for the development of ballastless track systems. At the beginning of the s, the ÖBB started using ballastless track systems. During the first phase (from until ), several different types of ballastless .
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Consistent and positive ballastless track systems – Global Railway Review
Rapid transit can mean rough conditions. The RHEDA RX ballastless track system masters with ease the great loads arising from metro transport and minimizes undesirable vibrations. ONE has systematically further developed this solution and has adapted it to changing requirements. RHEDA RX is a ballastless track that is designed as a mass-spring system supported elastically ballastpess its entire surface. This solution effectively isolates vibrations resulting from passing ballaztless. The system forms a mechanical filter below the track superstructure, which is superior to damping within the superstructure.
The reason for this greater effectiveness is the greater mass above the elastic layer. Design of the system is always project-related.
Implementation includes consideration of a great number of vibration-relevant parameters, and the use of multi-degree-of-freedom MDOF track model provides prediction of insertion loss for vibration isolation. Subsequently definition likewise takes place for the optimal combination of slab thickness and type of elastic mat. Owing to the restricted conditions in railway tunnels, as well as the resulting difficulties for supplying and handling materials there, crucial requirements result with respect to logistics and installation methods.
The ÖBB/Porr ballastless track system – Global Railway Review
RHEDA RX satisfies these constraints by requiring reduced quantities and sjstem of materials, construction support, and machines necessary on the construction site — and by its carefully designed installation methods.
The second step consists of preparation of an layout plan, and the mats are prepared project-tailored at the factory.
Individual elements of the matting can be laid at the construction site by hand and without use of machines.
The xystem sizing additionally reduces the cutting waste of the matting to a minimum.
The mats are then covered with plastic sheeting to prevent intruding concrete and thus forming acoustic bridges. The mats can support walking and vehicle traffic, which means no restrictions for track construction.
The mats are emplaced loose, thereby guaranteeing fast as well as smooth installation. Provision of the RHEDA RX supporting slab takes place according to the top-down principle — whereby the rails serve as reference for installation of the track.
In combination with the benefits of bi-block sleepers — with which track-geometric dimensions such as gauge superelevation are exactly defined in advance — the installation techniques lead to highly exact track geometry after installation. This also especially applies to the central component of the system: The mats were designed with rrack consideration taken of these required characteristics.
The elastic RockDelta mats truly demonstrate an outstanding degree of effectiveness and long service life — even balpastless decades of operation on conventional mainline routes.
The ÖBB/Porr ballastless track system
Baplastless elastic mats also allow the use of stiff and therefore simpler fastening systems from all leading manufacturers. This significantly reduces loads placed on the fastenings and appreciably extends life cycles. All components are simply accessible at all times and can be easily disassembled and exchanged.
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Consistent and positive ballastless track systems
Acoustic adaptation RHEDA RX is a ballastless track that is designed as a mass-spring system supported elastically over its entire surface. Simple installation techniques Owing to the restricted conditions in railway tunnels, as well as the resulting difficulties for supplying and handling materials there, crucial requirements result with respect to logistics and installation methods.
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