Railways: surface track – Roadbed
Patent
1996-08-30
1998-09-15
Le, Mark Tuan
Railways: surface track
Roadbed
238 9, 238382, E01B 900
Patent
active
058067647
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a track whose rails are laterally and downwardly supported on the rail outer side and on the rail inner side via elastic intermediate inserts by longitudinal carriers underneath the head portion, the rails extending at a distance above the track structure parts located therebelow.
To reduce the shocks occurring when the tracks are being used and to reduce the structure-borne noise created thereby, elastically mounted rails have been proposed for some time. Thus, e.g., in WO 92/04503 a track-substructure is described in which the rails are, supported on profiled rails as longitudinal carriers via elastic intermediate inserts, which are arranged on the rail outer and rail inner sides and which are connected with carriers consisting of prefabricated concrete parts arranged therebelow, the space underneath the foot portion of the rail being free. The carriers are interconnected by transverse struts. The profiled rails have a cross-section comprising several bends, and they are braced to each other by means of screws guided through the web of the rails. The structure of this track thus is complex, since a plurality of partially complicated structure parts are required whose mounting requires a lot of time.
SUMMARY OF THE INVENTION
To require fewer structure parts and less time, according to the invention it is provided that the longitudinal carriers at the rail outer side are first console ledges which are part of a base plate lying under the rails and that the longitudinal carriers on the rail inner side are second console ledges which are part of an inner plate lying between the rails, which inner plate in turn is supported on the base plate. The inner plate may be designed as a frame.
An advantageous embodiment of the invention consists in that on the rail outer side, the base plate comprises upwardly projecting side portions, on which the first console ledges are arranged to be integrated, and that the second console ledges are arranged to be integrated at the lateral ends of the inner plate or frame.
To equally distribute the load on the base plates and on the inner plates, and to avoid the coincidence of sites of abutment of the base plates with the sites of abutment of the inner plates, it may be advantageous that the base plate and the inner plate have equal lengths and are arranged to be longitudinally offset relative to each other by half a length.
For better static and dynamic transmissions of forces between the inner plates and the base plates, it is advantageous if the base plate and/or the inner plate comprise(s) at least one longitudinal rib to support the inner plate on the base plate, wherein preferably an elastomer band is arranged between the longitudinal rib of the base plate and of the inner plate, or between a longitudinal rib provided on the inner plate and the base plate, so as to obtain a sound absorbing effect and an elastic bedding.
A further advantageous embodiment is characterized in that the base plate comprises two upwardly directed longitudinal ribs arranged at a distance from each other, which longitudinal ribs are interrupted in their middle region or have a reduced height, and that the inner plate at its end regions includes two longitudinal ribs which register with the longitudinal ribs of the base plate. This ensures that the base and inner plates cannot be longitudinally shifted relative to each other.
To avoid bending of the elastomer bands at the transitions between the longitudinal ribs of the respective plates, and also to maintain the sound absorbing effect in this region, it is advantageous if the longitudinal ribs are designed to be chamfered at the mutual transitions to the respective plate body of the base plate or of the inner plate.
To save weight and material, the plates suitably are designed such that both the base plate and the inner plate in their middle are each provided with a preferably rectangle-shaped recess so as to form a frame, the frame optionally being provided with a closed bottom so as to in
REFERENCES:
patent: 1260149 (1918-03-01), Coughlin
patent: 1587691 (1926-06-01), Whittingham
patent: 3525472 (1970-08-01), Sato
patent: 4266719 (1981-05-01), Ortwein et al.
patent: 4616395 (1986-10-01), Farese et al.
patent: 4775103 (1988-10-01), Ortwein
Gmundner Fertigteile Gesellschaft m.b.H. & Co. KG
Le Mark Tuan
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