EP1831467B1 - Concrete sleeper and method for the production thereof - Google Patents

Description

The invention relates to a method for producing a concrete sleeper for high dynamic loads in a sleeper form.

From the document US-A-4925094 For example, a concrete sleeper is known in which cast-in steel plates are used to form bearing surfaces on which an insert of plastic material is placed, on which the rails are positioned. In this way, the abrasion resistance should be increased.

The document GB-A-2231902 proposes a concrete sleeper having an abrasion resistant layer forming a rail support surface. The abrasion resistant layer comprises particles of alumina which are part of a cement mixture.

The JP-A-402229301 discloses a concrete sleeper with rail support surfaces and a lower sole region consisting of a standard concrete, wherein the rail support surfaces and the lower sole region are made of a more wear-resistant material than the rest of the threshold.

At high dynamic loads, wear and / or abrasion phenomena often occur in the rail support point areas as well as on the underside of the concrete sleepers. This wear is caused by the compression of plastic layers, which are inserted between the rail and the concrete body of the concrete sleeper, or by grain rearrangements of the ballast bed under the concrete sleeper. Such Abrieberscheinungen arise, for example, when braking the enormously long trains in the US and Australia, which can move the welded rails by a few tens of millimeters, which of course leads to a corresponding Abriebbeaufschlagung the concrete sleepers.

With pulsating vertical load, the plastic layers are also stretched and contracted in the horizontal direction and consequently rub against the concrete surface of the concrete sleepers. On the underside of the concrete sleepers, in turn, the gravel grains rub against the concrete body. This results in material removal in the rail support points and on the underside of the concrete sleeper. Because of this, the geometry and load-bearing capacity of the concrete sleepers are so affected over time, that these are no longer suitable as safe and stable support elements.

The invention has for its object to provide a method for producing a concrete sleeper of the type mentioned, which counteracts these wear properties with little effort.

To achieve this object, a method with the method steps according to claim 1 is provided according to the invention. Alternatively, this object is also achieved by a method with the method steps according to claim 2.

In addition, the invention relates to a concrete sleeper, which is produced by a method according to the invention.

According to the invention, the abrasion, wear or tensile material is wet-wet bonded to the standard concrete in a sleeper mold and cured by first depending on the nature of the placement in the threshold, the abrasion, wear or tensile material as special concrete in introduced the sleeper mold and then the standard concrete is filled.

According to the invention, in this method, by introducing the different plastic concrete materials wet-on-wet the standard concrete and the special concrete by shaking or vibrating in the border area can be mixed together so that they form a monolithic body, but over its height on the desired different bending tensile strength or abrasion resistance.

Alternatively, it can be provided in a development of the method according to the invention that a preferably prefabricated plate made of plastic is used, the plate preferably in liquid or even plastic form in the concrete form is introduced and in this state enters into a connection with the concrete.

Fig. 1 u. 2

einen Schnitt durch eine Schwellenform zur Herstellung einer erfindungsgemäßen Betonschwelle mit abriebfesten Schienenauflageflächen, wobei rechts eine nicht erfindungsgemäße Variante dargestellt ist,

Fig. 3 u. 4

einen Längsschnitt durch eine Schwellenform in zwei unterschiedlichen Füllstadien zur Herstellung einer nicht erfindungsgemäßen Betonschwelle mit abrieb- und/oder verschleißfestem Material im unteren Sohlenbereich der Betonschwelle,

Fig. 5 u. 6

Längsschnitte durch eine Schwellenform bei der Herstellung einer nicht erfindungsgemäßen Betonschwelle mit hoher Zugfestigkeit im unteren Sohlenbereich, und

Fig. 7 bis 9

Schnitte durch eine Schwellenform in den verschiedenen Stadien der Herstellung einer erfindungsgemäßen Betonschwelle, die in der Mitte der Oberseite hohen Zugspannungen ausgesetzt ist.

Further advantages and details of the invention will become apparent from the following description of some embodiments and with reference to the drawings. Showing:

Fig. 1 u. 2

a section through a sleeper mold for producing a concrete sleeper according to the invention with abrasion-resistant rail support surfaces, wherein on the right a non-inventive variant is shown,

Fig. 3 u. 4

a longitudinal section through a sleeper mold in two different filling stages for producing a non-inventive concrete sleeper with abrasion and / or wear-resistant material in the lower sole region of the concrete sleeper,

Fig. 5 u. 6

Longitudinal sections through a sleeper mold in the production of a non-inventive concrete sleeper with high tensile strength in the lower sole region, and

Fig. 7 to 9

Sectioning through a sleeper mold at the various stages of manufacture of a concrete sleeper according to the invention subjected to high tensile stresses in the center of the top.

In Fig. 1 a sleeper mold 1 is shown which has mold areas for forming rail support surfaces 2. In order to achieve increased abrasion and wear resistance in the area of these rail support surfaces 2 serving as supports at high dynamic, optionally pulsating vertical loads, either, as shown on the right in FIG Fig. 1 shown, steel angle 3 are introduced before filling the threshold concrete, or it is inventively applied a first concrete layer 3 'of an abrasion and wear-resistant material, as in Fig. 1 is shown on the left. Subsequently, the filling of a standard concrete 4, as is in Fig. 2 is shown. Here, a prefabricated component, in the present case, the steel angle 3, incorporated into the pressure-resistant standard concrete 4 or it is achieved by shaking and vibrating left mixing of the two types of concrete in the border area, so that forms a monolithic body, but over its height has the desired different abrasion and wear resistance.

In the 3 and 4 For example, the method of producing a threshold with high abrasion and wear resistance in the lower sole region is shown. For this purpose, first of all the standard concrete 4 is introduced into the sleeper mold 1 with the exception of a low layer thickness which remains uncovered, and then a layer of a wear-resistant and / or wear-resistant special concrete 3 "is applied even in the wet state of the standard concrete 4.

In the embodiment of the FIGS. 5 and 6 It is about creating a threshold for rail lines, where high tensile forces occur at the bottom of the concrete sleepers. In the sleeper mold 1, the standard concrete 4 with high compressive strength is introduced again to about half of the threshold height and then filled a special concrete 3 '"with high tensile strength, again by compacting and vibrating in the interfaces a monolithic compound of the two types of concrete is realized.

The Fig. 7 to 9 Finally, show an embodiment in which a concrete sleeper, as shown in FIGS. 5 and 6 is prepared in the event that it rests in the middle, with the result that on the top in the middle additional tensile loads can occur. For this purpose, first in the threshold form 1 in the middle of a tensile concrete layer 3 "" applied as the first concrete layer, then introduced the normal standard concrete 4 in the sleeper mold 1 and then analogous to the FIGS. 5 and 6 the tension-resistant special concrete 3 '"filled in as additional concrete layer.

The invention defined by the claims is not limited to the illustrated embodiments. Because of the different use of abrasion or wear-resistant special concrete types As well as tensile concrete in different threshold ranges, for example, the tensile strength-increasing variant according to the Fig. 5 to 9 with the variant, in which a high abrasion resistance is achieved, as it is in the Fig. 1 to 4 is shown combined.

Claims (4)

1. Method for manufacturing a concrete sleeper for high dynamic loads in a sleeper mould (1) with mould regions for forming rail bearing surfaces (2), having the following steps:

   - introducing a first concrete layer (3'), of an abrasion- and wear-resistant material, into the sleeper mould (1) only in the region of the mould regions for forming the rail bearing surfaces (2) ;

   - subsequently filling, in the sleeper mould (1), a high-strength standard concrete (4) which is able to withstand high compressive forces;

   - wherein the first concrete layer (3') is bonded and cured, in the sleeper mould (1), in the wet state with the standard concrete (4).
2. Method for manufacturing a concrete sleeper for high dynamic loads in a sleeper mould (1), having the following steps:

   - introducing a first concrete layer (3''''), of a tension-resistant material, into the centre of the sleeper mould (1);

   - subsequently filling, in the sleeper mould (1), a high-strength standard concrete (4) which is able to withstand high compressive forces;

   - introducing a tension-resistant special concrete (3'''), as a further concrete layer, into the sleeper mould (1);

   - wherein the first concrete layer (3''') and the tension-resistant special concrete (3''') as a further concrete layer, are bonded and cured, in the sleeper mould (1), in the wet state with the standard concrete (4).
3. Method according to Claim 1 or 2, characterized in that the different concrete types, introduced in sequence into the sleeper mould (1), are mixed in the boundary region by shaking or vibrating in order to form a monolithic body.
4. Concrete sleeper for high dynamic loads, characterized in that it is manufactured in accordance with a method according to one of Claims 1 to 3.

Images