EP1512792B1 - Protective layer for railway track bed - Google Patents

Protective layer for railway track bed Download PDF

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Publication number
EP1512792B1
EP1512792B1 EP04017565A EP04017565A EP1512792B1 EP 1512792 B1 EP1512792 B1 EP 1512792B1 EP 04017565 A EP04017565 A EP 04017565A EP 04017565 A EP04017565 A EP 04017565A EP 1512792 B1 EP1512792 B1 EP 1512792B1
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Prior art keywords
protective layer
track
bedding
earth
shaped elements
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EP04017565A
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German (de)
French (fr)
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EP1512792A3 (en
EP1512792A2 (en
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Ralf Hoffmeister
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DB Netz AG
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DB Netz AG
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
    • E01B1/001—Track with ballast
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
    • E01B19/006—Means for protecting the underground against spillage

Definitions

  • the invention relates to a track bed with ballast body, earth body and a protective layer which separates the ballast body against the upcoming earth body and has abutting plate-shaped elements with high compressive strength and low water absorbency at long-term contact with moisture.
  • PSS anti-slip layers
  • these mineral mixtures have a wasserableitende and bearing capacity-increasing effect and thus protect the ballast bed from waterlogging, frost damage and uneven settlements or uplift.
  • the strength of the gravel sand layers to be installed vary not only strongly depending on the location, but that above all large amounts of earth material dug and transported, at the same time large quantities have to be delivered to new planum sand to be installed. Since these transport processes can usually only be done in the profile of the locked work track, they are associated with great mechanical engineering effort.
  • DE 31 47 346 It is known to apply foam boards as a substitute for these PSS composed of mineral mixtures on the ballastless planum and thus to achieve a comparable effect as in the "classic" PSS. However, it has been found that no sufficiently joint-free laying of rigid foam panels could be achieved and thus the water-draining effect required by such a protective layer was not achievable. To achieve a better water seal suggests DE 31 47 346 the installation of two superimposed layers of rigid foam plates, wherein the joints of these two layers are to be arranged offset to one another in such a way. In construction site practice, however, this approach has proven to be less realistic.
  • the GB 2 243 108 A discloses a protective layer which can be used for the construction of a track bed and which comprises a rigid core insert, preferably made of plastic, and upper and lower cover layers, which are manufactured from a more flexible geotextile material and wound around the core insert. Such an arrangement is intended to form a water-impermeable boundary layer for avoiding sludge rising from the substructure into the ballast layer.
  • the invention has for its object to provide a track bed with ballast body, earth body and a protective layer which separates the ballast body against the upcoming earth body and abutting plate-shaped elements with high compressive strength and low water absorbency at long-term contact with moisture, to develop an improved transition region between a Ballast ensured with or without a protective layer.
  • the protective layer should be suitable to rehabilitate existing rehabilitation-requiring routes with a lower logistics and machine use than before.
  • the bearing behavior of the superstructure is to be improved in terms of dynamic and static loads from train traffic.
  • the protective layer should be installable in a continuous conversion process with high propulsive power. It should be striven that no capital-intensive construction machinery requiring new construction be required, but that all necessary services should as far as possible be achievable with the existing machinery.
  • the installation of this new protective layer should also be weather-independent than with the base layers of gravel-sand mixtures.
  • the thickness of the plate-shaped elements continuously decreases in the transition region between a running with the plate-shaped elements and the nonwoven layer bed body and a run without planum protective bed body over a length of at least 20 meters and the minimum thickness of an element in the final area of the transition is still at least 0.04 meters.
  • the preferred embodiment of the plate-shaped elements made of hard foam additionally offers the advantages of a very low thermal conductivity, a high modulus of elasticity, favorable fracture stress ratios and a low intrinsic weight, whereby a manual handling of the plate elements is possible.
  • a folding of the rigid foam panels ensures a sufficiently positive connection of two elements.
  • B 2 * y + SB.
  • the size y corresponds to the vertical distance between the upper edge of the protective layer and the lower edge of the track sleepers resting on the ballast body
  • the size SB indicates the distance between both heads of a track sleeper measured transversely to the track longitudinal axis.
  • the plate-shaped elements are constructed of hard foam, in particular extruded polystyrene (for example X-PS-G).
  • the nonwoven layer is made of polypropylene and has a weight per unit area of at least 400 g / m 2 . It is also advantageous if the nonwoven layer is designed with a minimum load of 3 mm for a given load of 2 kN. Through these material properties exercises the fleece a capillary breaking effect. This makes sense, so that both the by the bumps between the plate-shaped elements penetrating leachate and the water rising through the pore water pressure rising water is reliably guided by the fleece in the edge drainage and water penetration of the protective layer is prevented.
  • FIG. 1 Construction of the track bed
  • the protective layer is created with the help of a commercially available ballast cleaning machine, which, compared with the planum improvement machines required for gravel-sand mixtures, causes a significantly lower capital expenditure.
  • the ballast cleaning machine is merely supplemented by a nonwoven unwinding device and a compaction plank to produce a level and sufficiently densified ground plane.
  • ballast bed cleaning As part of a ballast bed cleaning og Bettungstivsmaschine clears the track ballast below the track grid by means of a Schrapers or chain bar, cleans the old ballast, sifts to small gravel components and reintegrates the thus cleaned track ballast below again under the track grid.
  • the track grid is only raised in this process, but otherwise remains in its position.
  • the created in this work process of ballast cleaning machine ballast-free space can now be used for the introduction of fleece and plate elements. Within this ballast-free working space, the compaction pile runs ahead in the working direction and produces the required flatness, load capacity and density of the earth.
  • the fleece is rolled out to the Erdplanum, with an overlap of both roller conveyors of at least 30 cm takes place in a possible roll change.
  • the manual insertion of the plate elements forms the last step within the ballast-free working space before the processed ballast is fed back.
  • you can of course realize a gravity-assisted mechanical feed of the plate elements for example in analogy to the supply of track sleepers in the known track-laying machines.
  • the protective layer according to the invention tolerates a deviation from the desirable joint-free abutment of the plate elements, so that rectangular plate elements can continue to be used for this purpose. This has an advantageous effect on warehouse logistics.
  • the usual work for ballast cleaning measures in terms of lifting and compression stoppers and track stabilization done.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Railway Tracks (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Packaging Of Machine Parts And Wound Products (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Magnetic Heads (AREA)
  • Bipolar Transistors (AREA)
  • Laminated Bodies (AREA)

Abstract

The protective layer for the bed element (4), in particular, of a railway track consists of a watertight foil (2) covering the contact area between the bed element and an earth foundation (1), and abutting plate elements (3) capable of supporting large compressive loads and absorbing little water during their long-term contact with moisture.

Description

Die Erfindung betrifft ein Gleisbett mit Bettungskörper, Erdkörper und einer Schutzschicht, welche den Bettungskörper gegen den anstehenden Erdkörper abtrennt sowie aneinanderstoßende plattenförmige Elemente mit hoher Druckbelastbarkeit und geringer Wasseraufnahmefähigkeit bei Langzeitkontakt mit Feuchtigkeit aufweist.The invention relates to a track bed with ballast body, earth body and a protective layer which separates the ballast body against the upcoming earth body and has abutting plate-shaped elements with high compressive strength and low water absorbency at long-term contact with moisture.

Seit einigen Jahrzehnten ist es im Oberbau der Eisenbahnen üblich, den aus Gleisschotter aufgebauten Bettungskörper gegen das angrenzende Erdplanum mittels sogenannter Planumsschutzschichten (PSS) abzugrenzen. Dadurch soll der Bettungskörper von den teilweise negativen bodenmechanischen Einflüssen des anstehenden Erdgrundes entkoppelt beziehungsweise die unzureichenden bodenmechanischen Kennwerte des anstehenden Erdgrundes kompensiert werden. Üblicherweise werden PSS in Form von mineralischen Kies-Sand-Gemischen (KSG) mit oder ohne Zugabe von Brechkorn oder Recycling aufgebaut, deren Zusammensetzung und Körnung in Abstimmung mit den im jeweiligen Einzelfall vorliegenden hydrologischen und bodenmechanischen Verhältnissen festgelegt werden muss. Auf jeden Fall weisen diese Mineralstoffgemische eine wasserableitende und tragfähigkeitserhöhende Wirkung auf und schützen somit das Schotterbett vor Staunässe, Frostschäden und ungleichmässigen Setzungen bzw. Hebungen. Als besonders nachteilig wird allgemein empfunden, dass die Stärke der einzubauenden Kiessand-Schichten nicht nur ortsabhängig stark variieren, sondern dass vor allem grosse Mengen an Erdmaterial ausgehoben und abtransportiert, zugleich ebenso grosse Mengen an neu einzubauenden Planumssanden angeliefert werden müssen. Da diese Transportvorgänge üblicherweise nur im Profil des gesperrten Arbeitsgleises erfolgen können, sind sie mit grossem maschinentechnischen Aufwand verbunden.For several decades, it has been customary in the superstructure of the railways to demarcate the ballast body made of track ballast against the adjacent earth plane by means of so-called anti-slip layers (PSS). This is intended to decouple the bedding body from the partially negative soil mechanical influences of the upcoming soil or to compensate for the inadequate soil mechanics characteristics of the upcoming soil. Usually, PSS are built up in the form of mineral gravel-sand mixtures (KSG) with or without the addition of crushed grain or recycling, the composition and grain size of which must be determined in accordance with the hydrological and soil mechanical conditions present in each individual case. In any case, these mineral mixtures have a wasserableitende and bearing capacity-increasing effect and thus protect the ballast bed from waterlogging, frost damage and uneven settlements or uplift. As a particularly disadvantageous is generally felt that the strength of the gravel sand layers to be installed vary not only strongly depending on the location, but that above all large amounts of earth material dug and transported, at the same time large quantities have to be delivered to new planum sand to be installed. Since these transport processes can usually only be done in the profile of the locked work track, they are associated with great mechanical engineering effort.

Aus DE 31 47 346 ist es bekannt, Hartschaumplatten als Ersatz für diese aus mineralischen Gemischen aufgebaute PSS auf das schotterfreie Planum aufzubringen und somit eine vergleichbare Wirkung wie bei der "klassischen" PSS zu erzielen. Es hat sich jedoch erwiesen, dass keine hinreichend fugenfreie Verlegung der Hartschaumplatten erzielt werden konnte und damit die von einer solchen Schutzschicht geforderte wasserableitende Wirkung nicht erreichbar war. Zur Erzielung einer besseren Wasserabdichtung schlägt DE 31 47 346 den Einbau zweier übereinanderliegender Schichten aus Hartschaumplatten vor, wobei die Trennfugen dieser beiden Schichten zueinander derart versetzt angeordnet werden sollen. In der Baustellenpraxis hat sich dieser Ansatz jedoch als wenig realitätsbezogen erwiesen.Out DE 31 47 346 It is known to apply foam boards as a substitute for these PSS composed of mineral mixtures on the ballastless planum and thus to achieve a comparable effect as in the "classic" PSS. However, it has been found that no sufficiently joint-free laying of rigid foam panels could be achieved and thus the water-draining effect required by such a protective layer was not achievable. To achieve a better water seal suggests DE 31 47 346 the installation of two superimposed layers of rigid foam plates, wherein the joints of these two layers are to be arranged offset to one another in such a way. In construction site practice, however, this approach has proven to be less realistic.

Die GB 2 243 108 A offenbart eine für den Aufbau eines Gleisbettes einsetzbare Schutzschicht, die eine steife Kern-Einlage - bevorzugt aus Kunststoff - sowie hierzu obere und untere Deckschichten, die aus einem flexibleren Geotextil-Material gefertigt und um die Kern-Einlage gewickelt sind, umfasst. Eine solche Anordnung soll eine wasserundurchdringliche Grenzschicht zur Vermeidung von aus dem Unterbau in die Schotterschicht aufsteigendem Schlamm ausbilden.The GB 2 243 108 A discloses a protective layer which can be used for the construction of a track bed and which comprises a rigid core insert, preferably made of plastic, and upper and lower cover layers, which are manufactured from a more flexible geotextile material and wound around the core insert. Such an arrangement is intended to form a water-impermeable boundary layer for avoiding sludge rising from the substructure into the ballast layer.

Der Erfindung liegt die Aufgabe zugrunde, ein Gleisbett mit Bettungskörper, Erdkörper und einer Schutzschicht, welche den Bettungskörper gegen den anstehenden Erdkörper abtrennt sowie aneinanderstoßende plattenförmige Elemente mit hoher Druckbelastbarkeit und geringer Wasseraufnahmefähigkeit bei Langzeitkontakt mit Feuchtigkeit aufweist, zu entwickeln, das einen verbesserten Übergangsbereich zwischen einem Bettungskörper mit bzw. einem ohne Schutzschicht gewährleistet. Insbesondere soll die Schutzschicht geeignet sein, bestehende, sanierungsbedürftige Strecken mit einem geringeren Logistik- und Maschineneinsatz als bisher zu ertüchtigen. Neben der Ableitung von Wasser aus dem Schotterbett in die Randentwässerung und dem damit einhergehenden Schutz vor Frostschäden soll zugleich das Tragverhalten des Oberbaus hinsichtlich dynamischer und statischer Lasten aus dem Zugverkehr verbessert werden. Die Schutzschicht soll in einem kontinuierlichen Umbauverfahren mit hoher Vortriebsleistung einbaubar sein. Dabei ist anzustreben, dass keine neu zu konstruierenden, kapitalintensiven Baumaschinen erforderlich werden, sondern alle erforderlichen Leistungen weitestgehend mit dem vorhandenen Maschinenpark erbringbar sein sollten. Der Einbau dieser neuen Schutzschicht soll zudem witterungsunabhängiger als bei den Tragschichten aus Kies-Sand-Gemischen sein.The invention has for its object to provide a track bed with ballast body, earth body and a protective layer which separates the ballast body against the upcoming earth body and abutting plate-shaped elements with high compressive strength and low water absorbency at long-term contact with moisture, to develop an improved transition region between a Ballast ensured with or without a protective layer. In particular, the protective layer should be suitable to rehabilitate existing rehabilitation-requiring routes with a lower logistics and machine use than before. In addition to the discharge of water from the ballast bed in the edge drainage and the associated protection against frost damage at the same time the bearing behavior of the superstructure is to be improved in terms of dynamic and static loads from train traffic. The protective layer should be installable in a continuous conversion process with high propulsive power. It should be striven that no capital-intensive construction machinery requiring new construction be required, but that all necessary services should as far as possible be achievable with the existing machinery. The installation of this new protective layer should also be weather-independent than with the base layers of gravel-sand mixtures.

Diese Aufgabe wird in Verbindung mit dem Oberbegriff des Patentanspruches 1 erfindungsgemäß dadurch gelöst, dass die Stärke der plattenförmigen Elemente im Übergangsbereich zwischen einem mit den plattenförmigen Elementen und der Vliesschicht ausgeführten Bettungskörper und einem ohne Planumsschutzschicht ausgeführten Bettungskörper über eine Länge von mindestens 20 Meter kontinuierlich abnimmt und die Mindeststärke eines Elementes im Schlussbereich des Überganges noch mindestens 0,04 Meter beträgt. Dadurch wird erreicht, dass sowohl die Tragfähigkeit des Unterbaus im Übergangsbereich gewährleistet bleibt, gleichzeitig aber auch trotz unterschiedlicher Elastizitätsmoduli zwischen den beiden Bettungskörpern gleichmäßige Fahreigenschaften für die Züge sichergestellt werden. Ein mit plattenförmigen Elementen und Vliesschicht ausgeführtes System kann nicht nur den Oberbau zuverlässig entwässern, sondern auch die durch Eigengewicht des Oberbaus sowie aus dem Zugverkehr resultierenden Lasten zuverlässig und schadensfrei aufnehmen. Die bevorzugte Ausführung der plattenförmigen Elemente aus Hartschaum bietet zusätzlich die Vorteile einer sehr geringen Wärmeleitfähigkeit, eines hohen Elastizitätsmoduls, günstiger Bruchspannungsverhältnisse sowie eines geringen Eigengewichtes, wodurch auch ein manuelles Handling der Plattenelemente möglich wird. Eine Falzung der Hartschaumplatten gewährleistet eine ausreichend formschlüssige Verbindung jeweils zweier Elemente.This object is achieved in conjunction with the preamble of claim 1 according to the invention that the thickness of the plate-shaped elements continuously decreases in the transition region between a running with the plate-shaped elements and the nonwoven layer bed body and a run without planum protective bed body over a length of at least 20 meters and the minimum thickness of an element in the final area of the transition is still at least 0.04 meters. This ensures that both the load capacity of the substructure is ensured in the transition region, but at the same time despite different moduli of elasticity between the two ballast bodies uniform ride characteristics for the trains are ensured. A system designed with plate-shaped elements and fleece layer can not only dewater the superstructure reliably, but also reliably and without damage absorb the loads resulting from the superstructure's own weight as well as from the train traffic. The preferred embodiment of the plate-shaped elements made of hard foam additionally offers the advantages of a very low thermal conductivity, a high modulus of elasticity, favorable fracture stress ratios and a low intrinsic weight, whereby a manual handling of the plate elements is possible. A folding of the rigid foam panels ensures a sufficiently positive connection of two elements.

Gemäss einer vorteilhaften Ausgestaltung des erfindungsgemäßen Gedankens entspricht die Breite der Schutzschicht in Querrichtung zur Gleislängsachse mindestens einem Betrag B, wobei B gemäss der Beziehung B = 2*y + SB ermittelt wird. Hierbei entspricht die Größe y dem vertikalen Abstand zwischen der Oberkante der Schutzschicht und der Unterkante der auf dem Bettungskörper aufliegenden Gleisschwellen, die Größe SB gibt hingegen den in Querrichtung zur Gleislängsachse gemessenen Abstand beider Köpfe einer Gleisschwelle an. Dadurch ist gewährleistet, dass die Schutzschicht unabhängig von ihrer vertikalen Einbauposition stets den relevanten Lastausbreitungsbereich abdeckt.According to an advantageous embodiment of the inventive concept, the width of the protective layer in the transverse direction to the track longitudinal axis corresponds to at least one amount B, wherein B is determined according to the relationship B = 2 * y + SB. In this case, the size y corresponds to the vertical distance between the upper edge of the protective layer and the lower edge of the track sleepers resting on the ballast body, while the size SB indicates the distance between both heads of a track sleeper measured transversely to the track longitudinal axis. This ensures that the protective layer always covers the relevant load propagation range, regardless of its vertical installation position.

Gemäss einer bevorzugten Ausführungsform sind die plattenförmigen Elemente aus Hartschaum, insbesondere extrudiertem Polystyrol (z.B. X-PS-G), aufgebaut.According to a preferred embodiment, the plate-shaped elements are constructed of hard foam, in particular extruded polystyrene (for example X-PS-G).

Desweiteren ist es sinnvoll, wenn Werkstoff, vertikale Stärke und Grundfläche eines Einzelkörpers dieser plattenförmigen Elemente in Abhängigkeit von den bodenmechanischen Kennwerten des anstehenden Erdkörpers derart dimensioniert sind, dass auf der Oberfläche der eingebauten Schutzschicht Verformungsmoduli von Evd ≥ 45 MN/m2 oder Ev2 ≥ 100 MN/m2 bei einem Verdichtungsgrad von Dpr = 100 % erreicht werden.Furthermore, it makes sense if material, vertical strength and base area of a single body of these plate-shaped elements are dimensioned in dependence on the soil mechanical characteristics of the upcoming earth body such that on the surface of the incorporated protective layer deformation moduli of E vd ≥ 45 MN / m 2 or E v2 ≥ 100 MN / m 2 at a degree of compaction of D pr = 100% can be achieved.

Gemäss einer bevorzugten Ausführungsform ist die Vliesschicht aus Polypropylen ausgeführt und weist ein Flächengewicht von mindestens 400 g/m2 auf. Ebenso ist es noch vorteilhaft, wenn die Vliesschicht bei einer gegebenen Auflast von 2 kN mit einer Mindeststärke von 3 mm ausgeführt ist. Durch diese Materialeigenschaften übt das Vlies eine kapillarbrechende Wirkung aus. Dies ist sinnvoll, damit sowohl das durch die Stösse zwischen den plattenförmigen Elementen eindringende Sickerwasser als auch das durch den Porenwasserüberdruck nach oben steigende Wasser durch das Vlies zuverlässig in die Randentwässerung geführt wird und eine Wasserdurchdringung der Schutzschicht verhindert wird.According to a preferred embodiment, the nonwoven layer is made of polypropylene and has a weight per unit area of at least 400 g / m 2 . It is also advantageous if the nonwoven layer is designed with a minimum load of 3 mm for a given load of 2 kN. Through these material properties exercises the fleece a capillary breaking effect. This makes sense, so that both the by the bumps between the plate-shaped elements penetrating leachate and the water rising through the pore water pressure rising water is reliably guided by the fleece in the edge drainage and water penetration of the protective layer is prevented.

Der Erfindungsgedanke wird in nachfolgendem Ausführungsbeispiel visualisiert. Es zeigt in Prinzipdarstellung Figur 1 Aufbau des GleisbettsThe idea of the invention is visualized in the following exemplary embodiment. It shows in schematic representation FIG. 1 Construction of the track bed

Im Vorfeld des Einbaus des erfindungsgemäßen Gleisbetts muss zunächst durch Baugrund-Untersuchungen abgesichert sein, dass im Erdplanum grobkörniger beziehungsweise gemischt- und feinkörniger Boden ansteht, der auf Verformungsmoduli von Evd ≥ 35 MN/m2 oder Ev2 ≥ 45 MN/m2 bei einem Verdichtungsgrad von Dpr = 97 % gebracht werden kann bzw. diese bereits aufweist.
Die Erstellung der Schutzschicht erfolgt mit Hilfe einer handelsüblichen Bettungsreinigungsmaschine, die im Vergleich zu den bei Kies-Sand-Gemischen erforderlichen Planumsverbesserungsmaschinen einen deutlich niedrigeren Kapitalaufwand verursacht. Die Bettungsreinigungsmaschine wird lediglich um eine Abrollvorrichtung für das Vlies sowie eine Verdichtungsbohle zur Herstellung eines ebenen und ausreichend verdichteten Erdplanums ergänzt.
Im Zuge einer Schotterbettreinigung räumt o.g. Bettungsreinigungsmaschine den Gleisschotter unterhalb des Gleisrostes mittels eines Schrapers oder Kettenbalkens aus, reinigt den Altschotter, siebt zu kleine Schotterbestandteile aus und baut den derart gereinigten Gleisschotter nachfolgend wieder unter dem Gleisrost ein. Der Gleisrost wird bei diesem Vorgang lediglich angehoben, verbleibt jedoch ansonsten in seiner Lage. Der bei diesem Arbeitsprozess von der Bettungsreinigungsmaschine geschaffene schotterfreie Raum kann nun auch zum Einbringen von Vlies und Plattenelementen genutzt werden. Innerhalb dieses schotterfreien Arbeitsraumes läuft die Verdichtungsbohle in Arbeitsrichtung voraus und stellt die geforderte Ebenflächigkeit, Tragfähigkeit und Dichte des Erdplanums her. Von der anschließenden Abrollvorrichtung wird das Vlies auf das Erdplanum ausgerollt, wobei bei einem allfälligen Rollenwechsel eine Überlappung beider Rollenbahnen von mindestens 30 cm erfolgt. Das manuelle Einlegen der Plattenelemente bildet innerhalb des schotterfreien Arbeitsraumes den letzten Arbeitsschritt, bevor der aufbereitete Schotter wieder zugeführt wird. Alternativ lässt sich natürlich eine schwerkraftunterstütze mechanische Zuführung der Plattenelemente realisieren, beispielsweise in Analogie zur Zuführung von Gleisschwellen bei den bekannten Gleisumbaumaschinen. In Bogenradien bis zu 250 m toleriert die erfindungsgemäße Schutzschicht ein Abweichen von dem an sich wünschenswerten fugenfreien Aneinanderstoßen der Plattenelemente, so dass hierfür weiterhin rechteckige Plattenelemente verwendet werden können. Die wirkt sich vorteilhaft auf die Lagerlogistik aus. Nach Einbau der erfindungsgemäßen Schutzschicht erfolgen die für Bettungsreinigungsmaßnahmen üblichen Arbeiten hinsichtlich Hebe- und Verdichtungsstopfugen sowie Gleisstabilisierung.Prior to installation of the track bed according to the invention, it must first be verified by subsoil investigations that coarse-grained or mixed-grained and fine-grained soil is present in the earth plane, contributing to deformation moduli of E vd ≥ 35 MN / m 2 or E v2 ≥ 45 MN / m 2 a degree of compaction of D pr = 97% can be brought or already has.
The protective layer is created with the help of a commercially available ballast cleaning machine, which, compared with the planum improvement machines required for gravel-sand mixtures, causes a significantly lower capital expenditure. The ballast cleaning machine is merely supplemented by a nonwoven unwinding device and a compaction plank to produce a level and sufficiently densified ground plane.
As part of a ballast bed cleaning og Bettungsreinigungsmaschine clears the track ballast below the track grid by means of a Schrapers or chain bar, cleans the old ballast, sifts to small gravel components and reintegrates the thus cleaned track ballast below again under the track grid. The track grid is only raised in this process, but otherwise remains in its position. The created in this work process of ballast cleaning machine ballast-free space can now be used for the introduction of fleece and plate elements. Within this ballast-free working space, the compaction pile runs ahead in the working direction and produces the required flatness, load capacity and density of the earth. From the subsequent unwinding device, the fleece is rolled out to the Erdplanum, with an overlap of both roller conveyors of at least 30 cm takes place in a possible roll change. The manual insertion of the plate elements forms the last step within the ballast-free working space before the processed ballast is fed back. Alternatively, you can of course realize a gravity-assisted mechanical feed of the plate elements, for example in analogy to the supply of track sleepers in the known track-laying machines. In bow radii up to 250 m, the protective layer according to the invention tolerates a deviation from the desirable joint-free abutment of the plate elements, so that rectangular plate elements can continue to be used for this purpose. This has an advantageous effect on warehouse logistics. After installation of the protective layer according to the invention, the usual work for ballast cleaning measures in terms of lifting and compression stoppers and track stabilization done.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Erdkörperearths
22
Vlieswerkstoff aus PolypropylenNonwoven material made of polypropylene
33
plattenförmiges Elementplate-shaped element
44
Bettungskörper aus GleisschotterBallast body made of ballast
55
Gleisschwellesleeper
66
Schienerail

Claims (6)

  1. A track bed with bedding body (4), earth body (1) and a protective layer, which separates the bedding body from the in-situ earth body (1) and abutting slab-shaped elements (3) with high compressive load capacity and low water absorption capability upon long-term contact with moisture and a non-woven fabric layer (2) arranged between the in-situ earth body and the slab-shaped elements,
    characterized
    in that the thickness of slab-shaped elements (3) in the transition region between a bedding body embodied with the slab-shaped elements and the non-woven fabric layer and a bedding body embodied without planum protection layer continuously decreases over a length of at least 20 metres and the minimum thickness of an element in the end region of the transition still amounts to at least 0.04 metre.
  2. The track bed with bedding body (4), earth body (1) and a protective layer according to Claim 1, characterized in that the width of the protective layer in transverse direction to the track longitudinal axis corresponds to at least an amount B, wherein B is determined according to the relation B = 2*y+SB, the variable y corresponds to the vertical spacing between the upper edge of the protective layer and the lower edge of the track sleepers (5) lying on the bedding body and SB indicates the spacing of both heads of a track sleeper measured in transverse direction to the track longitudinal axis.
  3. The track bed with bedding body (4), earth body (1) and a protective layer according to at least one of the Claims 1 to 2, characterized in that the slab-shaped elements (3) are constructed of hard foam, more preferably extruded polystyrene.
  4. The track bed with bedding body (4), earth body (1) and a protective layer according to at least one of the Claims 1 to 3, characterized in that material, vertical thickness and base area of an individual body of the slab-shaped elements (3) as a function of the soil-mechanical characteristics of the in-situ earth body are dimensioned in such a manner that on the surface of the installed protective layer deformation moduli of Evd ≥ 45 MN/m2 or Rv2 ≥ 100 MN/m2 with a degree of compaction of DPR = 100% are achieved.
  5. The track bed with bedding body (4) earth body (1) and a protective layer according to at least one of the Claims 1 to 4, characterized in that the non-woven fabric layer (2) is embodied of polypropylene and has a basis weight of at least 400 g/m2.
  6. The track bed with bedding body (4), earth body (1) and a protective layer according to at least one of the Claims 1 to 5, characterized in that the non-woven fabric layer (2) with a given top load of 2 KN is embodied with a minimum thickness of 3 mm.
EP04017565A 2003-09-03 2004-07-24 Protective layer for railway track bed Expired - Lifetime EP1512792B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04017565T PL1512792T3 (en) 2003-09-03 2004-07-24 Protective layer for railway track bed

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20313800U 2003-09-03
DE20313800U DE20313800U1 (en) 2003-09-03 2003-09-03 Protective layer for the ballast of a track track

Publications (3)

Publication Number Publication Date
EP1512792A2 EP1512792A2 (en) 2005-03-09
EP1512792A3 EP1512792A3 (en) 2005-05-11
EP1512792B1 true EP1512792B1 (en) 2010-01-20

Family

ID=29558155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04017565A Expired - Lifetime EP1512792B1 (en) 2003-09-03 2004-07-24 Protective layer for railway track bed

Country Status (4)

Country Link
EP (1) EP1512792B1 (en)
AT (1) ATE455905T1 (en)
DE (3) DE20313800U1 (en)
PL (1) PL1512792T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101979766B (en) * 2010-10-21 2012-07-11 中铁第四勘察设计院集团有限公司 Subgrade bed structure of high-speed railway red clay cutting
DE102012105983A1 (en) * 2012-07-04 2014-01-09 Hering Bau Gmbh & Co. Kg Acoustic shielding unit and its structure

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243108A (en) * 1990-02-14 1991-10-23 Ian Thomas Smith A component for use in railway track construction

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB339520A (en) * 1929-12-30 1930-12-11 Trinidad Deutsche Oel Und Asph Method of constructing railway embankments
US3587964A (en) * 1969-04-18 1971-06-28 Meadows W R Inc Protective course for bridge deck
AT370151B (en) 1981-03-04 1983-03-10 Plasser Bahnbaumasch Franz BALLET CLEANING MACHINE AND HARD FOAM PANEL LAYING
DE3524719A1 (en) * 1985-07-11 1987-01-15 Phoenix Ag Protective layer for elastic track bed mat

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243108A (en) * 1990-02-14 1991-10-23 Ian Thomas Smith A component for use in railway track construction

Also Published As

Publication number Publication date
DE502004010662D1 (en) 2010-03-11
EP1512792A3 (en) 2005-05-11
EP1512792A2 (en) 2005-03-09
ATE455905T1 (en) 2010-02-15
DE20313800U1 (en) 2003-11-13
PL1512792T3 (en) 2010-06-30
DE202004005761U1 (en) 2004-08-19

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