Railways: surface track – Roadbed
Patent
1991-05-06
1992-12-22
Werner, Frank E.
Railways: surface track
Roadbed
238 27, E01B 100
Patent
active
051728583
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In railway track installations, the rails, attached to ties, are generally laid on a road bed on a granulate ballast layer, which is laterally embanked with a sufficient distance from the tie ends. It has been shown in practice that these embankments shift outward under the pressure of train traffic, so that there is the risk that the ballast layer under the ties will no longer guarantee sufficient support. For this reason, the embankments of such railway track installations are maintained at certain intervals, using suitable special machines which can move on the tracks. During this maintenance, the ballast material that has migrated outward is used again to form a sufficient embankment, at a certain angle of incline. Such maintenance work is labor-intensive and results in costs that are not insignificant.
From the magazine "Bautechnik", 1984, Issue 11, FIG. 6 on page 396, it is known to arrange sacks filled with a round ballast as reinforcement elements under the ties which carry the rails, and to attach them with reinforcement bands. Next to the rails and/or ties, an embankment of the type of a ballast layer can be seen. In such a process for supporting a railway track installation, obviously a special round ballast is required, which presumably is supposed to prevent the sharp edges of the ballast material from destroying the sacks. The disadvantage in such a process is the fact that the usual compacting of the ballast cannot be achieved in the sacks. It also does not appear possible to embed such sack-like reinforcement elements in a granulate ballast layer and to compact them with it.
SUMMARY OF THE INVENTION
An object of the invention is to provide a process for building a reinforced railway track installation, with reinforcement elements that can be placed together with the usual granulate ballast layer for railway track installations, and which allow subsequent compacting of the ballast layer.
In the process according to the invention, vehicle tires, preferably used tires, are arranged directly under the ties, concentrically at the intersection between the rail and the tie in each case. Support is provided with the usual granulate ballast layer, completely filling the tires. Afterwards, the necessary compacting can take place, with the vehicle tires being filled in compacted manner, due to their elasticity, but not being destroyed. The reinforcement elements form a permanent embedded element in the compacted granulate ballast layer, and thereby prevent the granulate from shifting into the lateral embankment after a extended period of train operation.
The reinforcement elements proposed absorb impact stress in excellent manner, and thereby guarantee a long lifetime of the entire support system.
It is known to embed vehicle tires parallel to the embankment plane, both from DE-OS 36 27 795 and from DE-GM 70 32 409. These vehicle tires take on a direct stabilization function in this case.
On the basis of a schematically represented railway track structure, the process according to the invention will be explained in greater detail below. The drawing shows:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 a cross-section through a railway track installation produced pursuant to the process according to the invention and
FIG. 2 a top view of the representation in FIG. 1.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
On a road bed designated with the number 5, a ballast layer 4 with a sufficient width is applied, which carries the support for the tracks formed by ties 2 and rails 1 attached to these with clamps. In this ballast layer, preferably at the intersection of rail 1 and tie 2, on both sides, in each case, vehicle tires 3 made of rubber are embedded below the ties 2, projecting beyond the ties 2 into an embankment area of the ballast layer 4. It is practical to arrange the embedded vehicle tires, especially used tires, in such a way that they are closely adjacent to each other on one rail side in each case. With suitably dimensioned vehicle tires and the predetermined
REFERENCES:
patent: 4679731 (1987-07-01), Klugar et al.
Eller Jr. James T.
Werner Frank E.
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