DK2787121T3 - Process for making foundation material which is under the track of a railway line. - Google Patents

Description

Method for processing the substructure located under the track of a railway section

Description

The invention relates to a method for reconditioning the subgrade material disposed beneath the rail of a railroad track.

The subgrade materials should be interpreted in the broadest sense in this context. In particular, the subgrade materials are crushed rock, soil material, earth masses, etc.

Similarly, the reconditioning of this subgrade material should also be interpreted in the broadest sense. In particular, the subgrade material is fractionated, separated, cleaned, reconditioned, etc., in the sense of the inventive reconditioning.

The subgrade materials used in railroad tracks are prone to wear and tear over the years due to mechanical stresses. The original new crushed rock thus experiences stress-related changes in its grain size as well as in its granulometric composition due to pulverizing and crushing. The fines content increases as a result, in particular in conjunction with any natural organic and chemical contamination. This means that the crushed rock mixture must be subjected to a cleaning process at regular intervals. The crushed rock is thus usually subjected to mechanical ballast cleaning on reaching a fines content of 20 to 30%. In concrete terms this means that ballast cleaning is required if the fines content of the granulation (smaller than ca. 22 mm) is 20 to 30% of the overall crushed rock fraction. The fines content of 20 to 30% in this case is waste crushed rock, which occurs in the form of the non-reusable crushed rock masses that are produced in the course of ballast cleaning. This waste crushed rock must be compensated for by the supply of new crushed rock.

In the case of the usual ballast cleaning measures, in which only the crushed rock is cleaned and replaced, the fines content described above is always disposed of. The fines content in this case is brought by means of rail wagons or by means of HGVs to a place of disposal or a place of reconditioning outside the rail region. The fines content must then be reconditioned or disposed of in a plant that is approved according to environmental regulations.

So-called MTS (mineral conveyor and storage unit) wagons/MT (mineral transport) wagons, which are able to undertake the intermediate bunkering and transport of materials on construction sites in the track construction sector, are in principle available on the market. These wagons are then used to transport material on the track axis in a single working direction or in different working directions, without being required to leave the track limitation profile (clearance profile) with the material.

Also available on the market are track construction machines, which are able to receive, clean and put back the crushed rock to be removed. In these conventional ballast cleaning machines, the material is removed and cleaned inside the machine as a whole on one and the same wagon, and the cleaned track ballast material is fed back onto the existing track system. The waste material in the form of undersized granular material and cover is transferred into so-called MFS wagons for removal.

As already mentioned, in the previously disclosed ballast cleaning machines, the fines content is transferred to the so-called MFS/MT wagons for final recycling and disposal. This means that a particular fines fraction (small grains as well as dirt and organic substances), which cannot be reused as track ballast, accrues from the ballast cleaning machine as waste for disposal. In its accrued mixture of fine fractions, however, this waste contains grain fractions that are themselves suitable for use for other construction purposes.

Overall, this means that the mixture of fines fractions arising in the course of ballast cleaning on the one hand contains absolutely no further recyclable fines components, for example organic components (top soil, abrasive particles, contaminants, etc.), but on the other hand also contains theoretically recyclable substances such as rock fractions, which in respect of their grain size lie beneath the crushed rock fraction that can be re-installed according to DIN. In effect, this means that, in the case of ballast cleaning with conventional market systems, the fines fraction with grain sizes smaller than ca. 22 mm is treated as waste.

An appropriate method according to DE 101 28 374 A1 relates to the supply of a construction site with construction materials in the form of different bulk materials, which are required simultaneously or successively at the construction site, wherein, in the illustrative embodiment according to figures 6 and 7, only the removed old crushed rock is fractionated, cleaned and reused, but the fines content is disposed of.

On this basis, the invention has as its object to make available a method for reconditioning the subgrade material disposed beneath the rail of a railroad track with greater effectiveness, in the sense that more components of the original subgrade material can be reused after reconditioning.

The above-mentioned object is accomplished by a method according to Claim 1, and by a wagon system according to Claim 7. A method for reconditioning the subgrade material disposed beneath the rail of a railroad track is thereby made available, which is characterized by its high effectiveness in the sense of the greatest possible reutilization of the reconditioned subgrade material. The inventive method in this case is characterized by the use of a rail-bound and, above all, modular wagon system. The expression “modular system” is understood in this case to denote that each wagon defines an individual reconditioning module, but without said wagon having other tasks to perform. In addition to the individual reconditioning of the subgrade material, the corresponding wagons are also able, of course, to store the material temporarily and/or to transport it onwards.

The underlying idea of the inventive method for reconditioning the subgrade material disposed beneath the rail of a railroad track is that a number of different reconditioning wagons are provided one after the other, which separate the subgrade material in the sense of the inventive processing into different fractions. This means that the separated fraction size continues to increase in size in the reconditioning wagons that are disposed one after the other. This also means that the modular combination of individual machines is used without interruption of the rail-bound workflow for the reconditioning and for the inventive further reconditioning of the fines accruing in the course of the ballast cleaning. What this means, on the whole, is simple and targeted reconditioning, separation and cleaning of the fines accruing in the course of cleaning ballast, which would otherwise have to be sent for disposal. This means specifically that the fractions smaller than 22 mm, for example, accruing in the course of the ballast cleaning are reconditioned in a rail-bound work process. These are precisely the fines fractions which usually require to be disposed of or which must be sent for reconditioning in an approved facility outside the rail region. In this case, according to the invention, the previously described contents of the crushed rock are separated one after the another and are reconditioned. In the process, after the inventive reconditioning, the fines that can be reused, for example the natural aggregate below the fraction of 22 mm, are separated and cleaned and made available for other purposes, whereas the fines content substances that are no longer usable, for example soil, top soil, dirt, etc., are finally disposed of. This avoids the need for the disposal or the reconditioning of the fines content fraction smaller than 22 mm, for example, at a track-independent place of disposal or place of reconditioning. Only those fines that cannot be reused, for example dirt, top soil, organic soil materials and components, chemical contaminants, etc., must be eliminated - as already mentioned - by their final disposal. The reusable fines that have already been obtained in the course of removal in this way can be supplied for direct recycling in the rail region or for recycling outside the rail region. The quantity of the loaded fines content without qualitative recyclability is greatly reduced as a result. For example, natural rock fractions with the grain size of the fines up to the crushed rock limit of 22 mm can thus be reused as edge way material, as drainage material or as subgrade material or miscellaneous filling material. In the worst case, the reusable fines can be supplied from the track construction project but also from a specific recycling facility outside the track. Then need for shipment and stationary reconditioning for the recovered raw materials at central locations is thus dispensed with entirely. This results in immediate savings in the construction process, since the disposal costs are directly dependent on the load class of a disposal fraction.

On the whole, therefore, the central idea of the inventive method thus lies in the variable reconditioning of the subgrade material involving the fractionating and/or reconditioning of crushed rock or soil materials as an integral part of the workflow process for the conveyance of waste material.

This means that the individual fractions that are obtained can undergo further treatment in a great variety of ways.

According to Claim 3, an advantageous further development proposes that a reconditioning module is disposed at the end of the reconditioning wagon. This means that the reconditioning module of the invention is present at the end of the respective wagon. This also means that, at the charging end of the wagon, the reconditioning module is disposed inside the conveyor line. In conventional wagons, the material is conveyed on conveyor belts in the roof area or is charged by conveyor belts of the adjacent wagon. The inventive use of a reconditioning module at the charging point of an MFS/MT wagon thus permits additional fractionating and reconditioning of the available fines with little technical effort and without interruption of the work flow.

According to a further development, the reconditioning module is preferably disposed in the roof area of the reconditioning wagon. A further development proposes that the reconditioning module is part of a separate roof rack in relation to the actual reconditioning wagon, said roof rack being disposed on the actual reconditioning wagon when the need arises. The underlying idea in this case is for the roof rack to be capable of being removed complete with its reconditioning module and exchanged for a roof rack with another reconditioning module of the wagon. Alternatively, this roof rack can also be a roof rack without a reconditioning module, which has only standard conveyor belts. This means that the base wagon as such can be used universally. It can thus be used as a normal wagon for the bunkering of materials and/or for the through-conveyance of materials, but also in the inventive sense by the exchange of the roof rack in such a way that reconditioning of the subgrade material is thereby possible in the inventive sense.

An additional further development proposes that, for the purposes of its treatment, the subgrade material is fractionated and, if necessary, cleaned additionally. Simple and targeted separation, cleaning and reconditioning of the fines that are obtained in the course of reconditioning, which fines are usually sent for disposal, is possible as a result. Optionally - as already mentioned - washing, cleaning or other reconditioning of the fines fraction component is possible.

According to an additional further development, a screen is used for the fractionating of the subgrade material. This means that the reconditioning modules as a general rule possess a screening and fractionating unit involving the use of a screen grate for separating the desired grains. The screen grates in this case can also be configured as roller grates. The hole width of the mesh grates or the width of the roller grates in this case is definitive for the fraction size. The mesh grates are basically capable of being replaced in order to vary the hole width of the screening and thus the desired screening particle size.

Finally, a further development proposes that the wagons have bottom conveyor belts and roof conveyor belts, as well as transfer conveyor belts at their ends. In this case, both the bottom conveyor belts and also the roof conveyor belts can have transfer conveyor belts at their ends. This means that universal material transport from wagon to wagon is possible by means of the conveyor belts of the wagon.

Illustrative embodiments of the inventive method for reconditioning the subgrade material disposed beneath the rail of a railroad track are described below on the basis of the drawings. In the drawings:

Fig. 1 depicts a schematic view of a work train with different wagons;

Fig. 2a depicts a view of wagons for reconditioning the subgrade material;

Fig. 2b depicts a detail of part of fig. 2a;

Fig. 3a depicts two different views of a screen grate;

Fig. 3b depicts two different views of a roller grate;

Fig. 4 depicts different views of the screen grate with charged sub grade material;

Fig. 5 depicts views corresponding to those in fig. 4, although additionally with a washing facility;

Figs. 6a to 6f depict different representations for the transport of material between two adjacent wagons;

Figs. 7a and 7b depict representations of a wagon with a removable roof rack.

Fig. 1 depicts a work train for restoring a railroad track. This railroad track consists of a rail 1, which rests on a subgrade material 2. This subgrade material 2 consists essentially of crushed rock as well as earth masses disposed beneath it. A formation protective layer is also conceivable.

The work train initially has a rail-bound removal wagon 3 for the removal and for the installation of the subgrade material 2, in particular the crushed rock. The removal wagon 3 is followed optionally by a transfer wagon 4. The further envisaged intermediate bunkering wagons 5 serve for the intermediate bunkering of materials. The adjoining additional wagon 6 serves for the separation and washing of the subgrade material 2, in the event of there being a lack of space, as an extension of the following modular cleaning wagon 7.

There then follow the inventive reconditioning wagons 8, 9 and any further - not represented here - reconditioning wagons. The reconditioning wagons 8, 9 in each case exhibit a reconditioning module 10 at one end, in particular where the subgrade material 2 to be reconditioned is supplied. These reconditioning modules 10 can be a screen 11 in the broadest sense, as represented in fig. 3a as a screen grate and in fig. 3b as a roller grate.

The operating principle is as follows:

The subgrade material 2 that is produced by means of the removal wagon 3 is initially supplied to the reconditioning wagon 8 after passing through the aforementioned wagons. As transport devices, the wagons have bottom conveyor belts 12 and roof conveyor belts 13 as well as transfer conveyor belts 14 at the ends of the bottom conveyor belts 12 and the roof conveyor belts 13.

The removed sub grade material 2 is charged into the reconditioning module 10 of the reconditioning wagon 8. Initial fractionating of the crushed rock is carried out via the sieving device 11 in this case. As can be appreciated from fig. 2b, the coarser contents of the crushed rock do not pass through the sieving device 11. Only the finer contents of the crushed rock pass through the sieving device 11 and are received by the first reconditioning wagon 8.

The crushed rock fraction, which has passed through the sieving device 11 of the first reconditioning wagon 8, makes its way via the roof conveyor belt 13 to the second reconditioning wagon 9 and arrives there on the reconditioning module 10 of this second reconditioning wagon 9. Precisely the same thing happens here, i.e. the sieving device allows the appropriate fraction to pass through, whereas the crushed rock material, which is not allowed through the sieving device 11, is conveyed onwards and, if necessary, is supplied to a further reconditioning wagon. The mesh size of the sieving device 11 of the second reconditioning wagon 9 is larger in this case than the mesh size of the sieving device 11 of the first reconditioning wagon 8.

Fig. 5 shows how a further washing facility 15 can be assigned additionally to the sieving device 11. This washing facility 15 cleans the crushed rock of non-usable fines, for example dirt, top soil, organic soil materials and components, chemical contaminants etc. These non-useable fines are eliminated by final disposal.

Figs. 6a to 6f depict in different variant embodiments the material flow of the sub grade material 2 supplied to the reconditioning module 10 of the respective reconditioning wagon 8, 9. The black arrows in this case indicate the crushed rock with a larger fraction size, and the white arrows indicate the crushed rock fraction with a smaller grain size. It is thus possible to appreciate how the crushed rock fraction with the smaller grain size falls through the sieving device 11. It can also be appreciated how the crushed rock is charged into the reconditioning module 10 via various routes, in particular via roof conveyor belts 13 as well as transfer conveyor belts 14.

Figs. 7a and 7b finally depict another further development of the reconditioning wagons 8, 9, to the effect that the reconditioning modules 10 are not connected securely and permanently to the corresponding reconditioning wagons 8, 9, hut that the reconditioning modules 10 are part of a roof rack 16, which is arranged removably on the respective wagon 8, 9. This means that the base frame of the wagon can be fitted with a special roof rack 16, if required, wherein the roof rack 16 - as in the represented illustrative embodiment - exhibits a reconditioning module 10 for the inventive reconditioning method, but can also be equipped without a reconditioning module 10 and then possesses only conveyor belts. As a result, the base wagons are suitable for universal application, including in the sense of the inventive reconditioning of subgrade materials 2 involving the use of reconditioning modules 10, which in this case are a part of the roof rack 16.

List of Reference Designations 1 rail 2 subgrade material 3 removal wagon 4 transfer wagon 5 intermediate bunkering wagon 6 additional wagon 7 cleaning wagon 8 reconditioning wagon 9 reconditioning wagon 10 reconditioning module 11 sieving device 12 bottom conveyor belt 13 roof conveyor belt 14 transfer conveyor belt 15 washing facility 16 roof rack

Claims (8)

A method of reprocessing foundation material (2) which is underneath the track (1) on a railway line, using a removal carriage (3) to remove the foundation material (2), as well as a number of different modular work carts (8 , 9) disposed downstream of the removal cart (3), which removal cartridges (8, 9) each define an individual reprocessing module (10) for reprocessing of base material (2) and temporary storage and / or transport of the reprocessed material, whereby the base material (2) is first removed by means of the removal cart (3), and, subsequently, the removed foundation material (2) is successively delivered to the reprocessing carriage (8, 9) in such a way that the foundation material (2) is fractionated in the first reprocessing carriage (8). ) by means of a sieve device (11), whereby the finer content of the crushed rock material passes through the sieve device (11) and is received by the first work-up trolley (8), the remaining foundation material (2) that was not reprocessed in this first reprocessing trolley (8) and is the crushed rock fraction which does not pass through the sieve device (11) in the first reprocessing trolley (8) is delivered to the second reprocessing trolley (9) for fractionating this remaining foundation material (2) by a sieve device (11), whereby the mesh size of the sieve device (11) of the second reprocessing carriage (9) is larger than the mesh size of the sieve device (11) of the first reprocessing carriage (8) and, if necessary, the respective residual foundation material (2), which is the crushed rock material not passing through the second sieve device (11), continues to be worked into at least one additional reprocessing vehicle by means of a sieving device whereby the separated fraction size becomes larger and larger in the reprocessing trolleys arranged one after the other, thereby for reuse, in addition to roughly crushed rock fractions, fractions less than 22 mm and comprising natural gravel, are also worked up, separated and purified in a rail-bonded process, and only the non-reusable small parts, including dirt , humus, organic soil material and constituents, chemical pollutants, are disposed of. Method according to the preceding claim, characterized in that the foundation material (2) worked up in the respective working carts (8, 9) is either immediately stored in the respective working carriage (8, 9) or delivered to a separate carriage or is transported outside the rail area or resubmitted to the site of removal for re-installation, whereby the natural stone fractions with a size of up to 22 mm stone crushing limit are advantageously reused as road material, as drainage material or as foundation material or other fill material. Method according to any one of the preceding claims, characterized in that a working module (10) is arranged at the end of the working carriage (8, 9). Method according to claim 3, characterized in that the working module (3) is arranged in the roof area of the working car (8, 9). Method according to claim 3 or claim 4, characterized in that the working module (10) is part of a roof rack (16) which is separate from the current working carriage (8, 9), which roof rack ( 16) is mounted on the current reprocessing trolley (8, 9) as removable if needed. Process according to any one of the preceding claims, characterized in that, for the processing of the foundation material (2), further cleaning of this foundation material (2) is effected, whereby a washing apparatus (15) for removing fine material which is not can be used from the crushed stone material allocated to the sieving device (11). A trolley system for reprocessing the foundation material (2) located below the rail (1) on a runway, the trolley system comprising a removal cart (3) for removing the foundation material (2), a number of different modular work trolleys (8, 9) disposed downstream of the incinerator carriage (3), each reprocessing carriage (8, 9) each comprising an individual reprocessing module (10) for reprocessing of base material (2) and means for temporarily storing and / or transporting the reprocessed material, and conveying devices (12, 13, 14) for transporting the foundation materials (2) from the removal carriage (3) to the working carriages (8, 9), each working module (10) comprising a screen scanning device (11) and, for transferring it crushed rock fraction which did not pass the sieve device (11) on the first reprocessing trolley (8), said carriage system comprising a roof conveyor belt (13) running to the reprocessing module (10) on the second n reprocessing trolley (9), whereby the mesh size of the sieve device (11) of the second reprocessing carriage (9) has a larger mesh size than the sieving device (11) of the first reprocessing trolley (8), whereby the trolley system can be used for reprocessing, separation and cleaning. of not only coarse, crushed rock fractions, but also fractions of less than 22 mm and comprising natural gravel, are also worked up, separated and cleaned in a rail-bound work process, and only the non-reusable small parts, including dirt , humus, organic soil material and constituents, chemical pollutants, are disposed of. Trolley system according to claim 7, characterized in that the trolley system comprises at least one additional working carriage for reprocessing of the respective remaining foundation material (2), which is the crushed rock material which does not pass through the second sieving device (11), the separated fraction size becomes larger and larger in the reprocessing trolleys positioned one after the other.