Railways: surface track – Roadbed – Continuous
Reexamination Certificate
1999-08-17
2001-05-29
Morano, S. Joseph (Department: 3617)
Railways: surface track
Roadbed
Continuous
C238S030000
Reexamination Certificate
active
06237856
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method for installing a steady rail track, for which the concrete railroad ties, which carry the rails or auxiliary rails and the continuous reinforcement of which protrudes below out of the only partially constructed concrete casing, are pre-installed initially into a rail grid and subsequently lined up positionally over a supporting layer and embedded in a casting composition.
In an earlier patent application, such an installing method has already been proposed, in which, by only the partial concreting of the concrete railroad ties and by the protrusion of their reinforcement, a better connection with the casting composition is attained and, with that, an even more advantageous vibrational behavior of the steady rail track is ensured.
For this known installation method, a concrete trough is formed initially on the hydraulically bound supporting layer of the rail track and the rail grid is aligned in this pre-concreted concrete trough with the only partially concreted railroad ties and then cast. This construction is, however, very costly since it is necessary initially to form such a concrete trough, which is necessarily itself provided with reinforcement, on the hydraulically bound supporting layer, before the railroad ties can be introduced.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide an installing method, for which, while the railroad ties are tied in equally well and the vibrational behavior is equally advantageous, the steady rail track can be produced more simply and more quickly and at a lower cost.
To accomplish this objective, provisions are made pursuant to the invention so that the rail grid, with the interposing of a supporting reinforcement, which is optionally tied to the underside of the railroad tie reinforcement, is aligned directly over a hydraulically bound supporting layer and the casting composition, preferably using movable, removable side formwork, is applied on the hydraulically bound supporting layer.
Instead of first of all producing a concrete trough, which is stabilized by supporting reinforcement and in which the rail grid is then aligned and cast, the concrete trough or the layer replacing it is produced in the case of the inventive version of the installation method practically in one working step with the casting of the railroad ties of the rail grid. The supporting reinforcement, which represents the actual main reinforcement of the finished, steady rail track, can be placed simply on the hydraulically bound supporting layer, being kept at a distance from this supporting layer with the help of supporting feet. It can also be tied underneath directly to the railroad tie reinforcement. This also has the additional advantage that there are no interfering longitudinal joints next to the supporting walls.
The railroad ties can be one-block concrete railroad ties as well as also two-block concrete railroad ties, the reinforcement of which comprises structural steel rods, which extend essentially parallel to the railroad tie axis, are connected with one another by straps and, as connecting elements, extend continuously through the two individual blocks. This construction, for which the connecting elements then of course are ultimately embedded in the casting composition, provides particularly vibrationally elastic steady rail tracks.
The development of the invention has proven to be particularly advantageous if the reinforcement of the railroad ties, particularly of the two-block railroad ties, has so-called grid supports with in each case three longitudinal rods, forming the edges of a triangular prism, and two meandering coils, which connect these longitudinal rods. Such grid supports are commercially obtainable, so that the frequently expensive pre-manufacturing of a reinforcing basket can be omitted or limited simply to the simple connecting of several grid supports.
The alignment of the rail grid over the hydraulically bound supporting layer can be accomplished in any convenient manner, for example, also with the help of so-called portal suspensions. However, it has proven to be particularly advantageous if the height and lateral position of the rail grids are lined up over adjusting spindles. This can be accomplished, for example, by using disposable, also embedded, adjusting angle iron, which is supported for the adjustment at the hydraulically bound supporting layer and has threaded boreholes for the vertically and horizontally adjusting spindles.
To simplify the manufacture of the casting and, at the same time, to achieve water drainage to the side of the steady track, a railroad tie, for which the partial concreting is provided on top with stripping edges for the casting composition extending from one end of the railroad tie to the other at an angle to the running plane of the rails, the inclination being about 1% is provided, for carrying out the inventive installation method in a development of the invention. These inclined stripping edges can be achieved most simply owing to the fact that the whole of the upper side of the partial concreting of the railroad ties, with the exception, of course, of the rail fastening humps, is constructed as an inclined plane.
Finally, it is still also within the scope of the invention to provide the railroad ties with height markings for making a more exact locating possible during the installation.
REFERENCES:
patent: 5435486 (1995-07-01), Geriach et al.
patent: 5653388 (1997-08-01), Pietschmann et al.
Bachmann Hans
Mohr Winfried
Jordan and Hamburg LLP
McCarry, Jr. Robert J.
Morano S. Joseph
Pfleiderer Infrastrukturtechnik GmbH & Co.
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