HK1219521B - Crosstie block unit for railway systems - Google Patents

Description

Sleeper block unit for railway track system

Technical Field

The invention relates to a sleeper block unit for a railway track system, consisting of a sleeper block and a sleeper pad (schwellschuh) partially surrounding the sleeper block, wherein the sleeper block has a top region and a bottom region with side wall surfaces and a bottom surface, and wherein the top region is longer and wider than the bottom region, so that a step is created between the top region and the bottom region.

Background

Sleeper block units are used in so-called fixed track systems (Fahrbahnen), which are becoming increasingly popular for so-called ballast tracks, since the performance of the track system with respect to the achievable speed is thereby increased and the maintenance costs are reduced. Such a sleeper block unit has a block, usually made of concrete, a tie plate, usually made of formed rubber, which accommodates the block, and an elastic elastomer damper, which is arranged between the bottom of the block and the bottom of the tie plate. Above the block there is provided a fixing system for the track. The backing plate is impregnated with concrete.

In patent DE10196374B4 it is described: in such sleeper block units, the ratio between dynamic and static stiffness increases with vertical movement of the block so that deformation of the elastomeric damper under dynamic loading is impeded by the contact surface between the block and the pad wall, and this contact surface is a phenomenon known as a wedge effect. The mentioned patent describes hereafter a solution for eliminating the wedge effect without reducing the transversal resistance of the rail and for reducing the ratio between the dynamic stiffness and the static stiffness. It is obvious that the rigidity and damping properties of the sleeper block unit are adversely affected when water, dust, dirt, concrete paste etc. enters between the block and the tie plate, more particularly when the penetrating water freezes. Measures have therefore been proposed to seal the space between the block and the shim plate to the outside.

Documents EP1017906B1 and DE4335516a1 each show a sleeper block and a sleeper pad which partially surrounds the sleeper block, wherein a resilient sealing lip is provided at the upper edge of the sleeper pad which bears against a substantially vertically oriented outer wall of the sleeper block. This arrangement has the following disadvantages: during the vertical movement of the sleeper blocks, the sealing lips rub against the outer walls of the sleeper blocks and are thus subject to wear, whereby the sealing action diminishes over time. EP0915202a1 describes a device having a sleeper block and a sleeper pad, wherein the sleeper pad has a circumferential sealing device at the upper edge, which sealingly engages in a circumferential groove provided in the sleeper block specifically for the sealing device. The groove makes the manufacture of the sleeper block difficult. Finally, patent application FR2840330a1 describes a device with tie blocks and a tie pad, wherein the tie pad has a relatively complex sealing device at the upper edge, which sealing device is produced with the aid of a flowable sealing material.

Disclosure of Invention

Starting from this prior art, the invention is based on the following objects: a sleeper block unit of the type mentioned at the outset is proposed, in which the sealing device is of simple design and nevertheless experiences only small wear during operation.

According to the invention, this object is achieved in that: at the upper edge of the sleeper pad, a circumferential sealing lip is provided, the free end of which is oriented upward and outward and rests from below on a contact surface formed by a step.

This solution according to the invention has the following advantages, among others: the sealing lip is essentially vertically deformed in the elastic range by the step during the vertical movement of the sleeper block in the sleeper pad and does not rub against the outer wall of the sleeper block as in the known sleeper block units. The sealing lip is therefore less worn, as a result of which the sealing action is maintained longer and the sleeper block unit has a longer service life.

According to one embodiment of the invention, the step forms a contact surface which is locally oriented at least approximately parallel to the base surface. The contact surface vertically compresses the sealing lip when the sleeper block is pressed elastically into the sleeper pad.

According to a further embodiment, the transition region between the step and the side wall of the base region is rounded. The sealing lip is advantageously inserted into this rounding, so that a relatively large contact surface exists between the sealing lip and the sleeper block.

According to a further embodiment, a circumferential, outwardly oriented bulge is provided in the base region of the sealing lip on the sleeper pad. This elevation serves on the one hand as an indicator of the height of the concrete, at which the sleeper block unit is injected, and on the other hand forms a stable base for the sealing lip.

Finally, according to an additional embodiment type: not only the bottom area of the bolster but also the bolster decreases in length and width from top to bottom. The sleeper block unit reinforced with concrete can therefore be replaced without the surrounding concrete being cut open.

Drawings

An embodiment of the invention is described in detail below, for example, with reference to the attached drawing figures. The figures show:

fig. 1 shows a partial cross-sectional view on the long side of a sleeper block unit;

fig. 2 shows a partial cross-sectional view on a short side of the same sleeper block unit; and

fig. 3 illustrates the unit in fig. 1 or 2 on an enlarged scale.

Detailed Description

Fig. 1 and 2 each show a partially sectioned side view of an exemplary embodiment of a sleeper block unit 1 according to the invention, viewed once on the long side and once on the short side of the sleeper block unit 1, which has a substantially rectangular basic contour. The sleeper block unit 1 corresponds to the sleeper block unit described in DE10196374B4, with the exception of the sealing lip 14 described below, and is composed of a sleeper block 2 made of concrete, which surrounds it over a part of its height, and a sleeper pad 3 made of an elastic material, preferably rubber. The sleeper block 2 has a top region 4 with a bearing surface 5 for a rail fastening means (not shown). Furthermore, the sleeper block 2 has a bottom region 6 which is shorter and narrower than the top region 4, so that a step 10 is created between the top region 4 and the bottom region 4. The side wall surfaces 7 of the bottom section 6 are slightly inclined so that the length and width of the bottom section 6 decrease downwards. Replacement of the sleeper block unit 1 can thereby be achieved without the surrounding concrete having to be cut open. The bottom surface of the sleeper block 2 is indicated at 8. The mentioned step 10 forms a circumferential contact surface which is oriented at least approximately parallel to the base surface 8 in the outer region and whose function will be described below. The transition region 9 between the side wall surface 7 and the step 10 is preferably rounded as shown.

The sleeper pad 3 has four side walls 11 and a bottom 12, and a resilient insert 15 is provided between the underside 8 of the sleeper block 2 and the bottom 12 of the sleeper pad 3, which insert allows vertical movement of the sleeper block 2 in the sleeper pad 3 under load during operation. On the outer wall 11 of the sleeper pad 3, horizontally extending elevations 13 are provided, which serve as an orientation of the height to be followed by the concrete, which is indicated in fig. 1 and 2 by lines 16, when the sleeper block unit 1 is reinforced by concrete casting.

As is shown particularly clearly in the enlarged detail in fig. 3, a circumferential sealing lip 14 is provided at the upper edge of the sleeper pad 3, the free end of which is oriented outward and rests from below on the contact surface formed by the step 10. In operation, when the sleeper block 2 is moved vertically with the insert 15 pressed in elastically, the sealing lip 14 is bent elastically by the contact surface, wherein the sealing lip is always in contact with the contact surface in order to reliably seal the gap between the sleeper pad 3 and the sleeper block 2. By virtue of the elastic bending, relatively little friction is generated between the sealing lip 14 and the sleeper block 2, so that the sleeper block unit 1 according to the invention, despite its simpler construction, has a longer service life than known sleeper block units.

List of reference numerals

1 sleeper block unit

2 sleeper block

3 sleeper pad

4 top area

5 bearing surface

6 bottom zone

76 of the side wall surface

86 bottom surface

9 transition region

10 steps

113 of a glass substrate

123 bottom

13 raised part

14 sealing lip

15 insert

16 lines (concrete height)

17

18

19

20

Claims (4)

1. Sleeper block unit (1) for a railway track system, consisting of a sleeper block (2) and a sleeper pad (3) partially surrounding the sleeper block (2), wherein the sleeper block (2) has a top region (4) and a bottom region (6) with side wall faces (7) and a bottom face (8), and wherein the top region (4) is longer and wider than the bottom region (6), so that a step (10) is created between the top region (4) and the bottom region (6), wherein the step (10) forms a contact surface which is locally oriented at least approximately parallel to the base surface (8), it is characterized in that a surrounding sealing lip (14) is arranged at the upper edge of the sleeper pad (3), the free end of the sealing lip is oriented upward and outward and rests from below on the contact surface formed by the step (10).

2. Sleeper block unit (1) according to claim 1, characterized in that the transition region (9) between the side wall (7) of the bottom region (6) and the step (10) is rounded.

3. Sleeper block unit (1) according to claim 1 or 2, characterized in that on the sleeper pad (3) in the bottom region of the sealing lip (14) a circumferential, outwardly oriented bulge (13) is provided.

4. Sleeper block unit (1) according to claim 1 or 2, characterized in that not only the bottom region (6) of the sleeper block (2) but also the sleeper pad (3) decreases in length and width from top to bottom.