Excavating – Railway graders
Patent
1996-10-24
1998-09-08
Carone, Michael J.
Excavating
Railway graders
171 16, E02F 504
Patent
active
058027440
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of reconstructing railway track systems, particularly multi-track installations, whereby, while clearing away the bed of the old track, a trench with side wall protection is cut and proceeds on the same path, the material for making the new track bed being introduced into that trench. Furthermore, the invention is concerned with an expedient apparatus for carrying out the method.
STATE OF THE ART
In practice, it is well known that to a great extent there is a problem of reconstructing existing railway track systems and/or their sub-grade. In this respect, mostly the entire sub-grade, in other words the entire track bed, has to be removed and remade. In view of the multiple or double track systems which are mostly involved, these works must be carried out while maintaining rail traffic on the existing tracks which makes the work of reconstruction considerably more difficult. Reconstruction can be carried out in such a way that while the old track bed is being cleared away, a trench is cut out, for example by means of an excavator, in which case it is necessary above all to secure the trench wall which is towards the adjacent track and this is achieved by means of sheet piles or protective walls. The materials for the bed of the new track are fed into the cutout and secure trench and compacted. It is then possible to lay a compacted bed of sand onto the bottom of the trench first, followed then by compacted crushed rock which forms the bed for the superstructure of the new track.
SUMMARY OF THE INVENTION
Above all, the object of the invention is to provide a method and an apparatus with which the aforesaid reconstruction works can be carried out in a technically perfect and reliable manner with high rates of advance.
According to the method of the invention, this problem is resolved in that for safeguarding the trench, a sliding cutting structure with bottom cutters resting on the trench bottom and with side cutters which serve to safeguard the side walls of the trench is used, the bottom and side cutters guided on a supporting frame being advanced under pressure by means of cutter cylinders disposed between them and the supporting frame, individually or in groups and in the direction of trench progress, before the supporting frame follows. Preferably, the trench floor is laid with a gradient towards the side of the trench and sufficient to drain off water.
For the reconstruction of track systems, the method according to the invention employs a sliding cutting structure which is basically known for cutter plate tunnelling but also for trench cutting. By applying this method to the reconstruction of track systems, it is possible to achieve considerable rates of progress, especially since the hitherto necessary work of installing sheet piling and the like becomes unnecessary. The sliding cutting structure provided according to the invention makes it possible reliably to secure the cut-out trench over a sufficiently long working path and also permits curves to be negotiated in order to adapt to the run of the track. At the same time, in the protection of the sliding cutting structure, the trench cutting work and/or the work of making up the new track bed can be carried out reliably and briskly. The supporting of the sliding cutting structure or its supporting frame on the trench floor, via the bottom cutters, results in a desirable smoothing and compaction of the trench floor and is favourable to the operation of the cutting structure as the tunnelling cutters push forward and also favourable to pulling on the supporting frame. It is recommended to carry out the method in such a way that behind the sliding cutting structure the trench floor is level before the new bed is incorporated, and this can be achieved by means of a pressure or levelling beam displaceably coupled to the sliding cutting structure or its supporting frame. With regard to reliable securing of the trench in the respective working zone and also the directional control facilit
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Heitkamp Herbert
Kampmann Werner
Linde Klaus
Oppel Franz
Rieger Jurgen
Carone Michael J.
Pezzuto Robert
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