EP2491178A1

EP2491178A1 - Rail web damping to reduce sound on rail lines

Info

Publication number: EP2491178A1
Application number: EP10776960A
Authority: EP
Inventors: Winfried BÖSTERLING; Michael Harrass; Jörg Happe; Dirk VORDERBRÜCK
Original assignee: Vossloh Werke GmbH
Current assignee: Vossloh Werke GmbH
Priority date: 2009-10-22
Filing date: 2010-10-22
Publication date: 2012-08-29
Also published as: CN102725449B; CN102725449A; EP2314768A1; US20120228394A1; EP2314768B1; WO2011048209A1; ES2437145T3; WO2011048209A4; US8763924B2

Abstract

A profiled element for damping sound vibrations on rail lines (32) comprises a first main surface (12), which is designed and dimensioned such that it can be attached as a support surface (16) to sections of the rail web (36) without having to provide an adhesive layer, wherein the profiled element (10) further has at least one recess (24) on a front surface (14) located opposite of the support surface (16), wherein the at least one recess (24) in the front surface (14) is designed for the positive engagement of an elastic fixing element (40) for fixing the profiled element (10) against the rail web (36), and at least one widened region (26) of the profiled element (10) in the region of the front surface (14), said widened region being disposed in the lower region of the front surface (14) in the installed position.

Description

Rail web damping for noise reduction

at railway tracks

Field of the invention

The invention relates to a profile element for damping sound vibrations on railway tracks and the use of a special profile element for attachment to the web of a rail for noise reduction in railway tracks.

State of the art

When driving trains on railway tracks audible vibrations of the rails may occur, which are undesirable, especially in the settlement area or near settlement. Since vibrations of the rail occurring during driving frequently occur at specific locations, such as e.g. in tight turns or in the downhill area, have already been in the prior art

Systems designed to dampen sound vibrations on rails.

From WO03 / 085201 AI is a damping means for

Sound vibrations on rails known, which provides damping means, which are glued to both sides of the rail on the rail web. The plastic material used for the damping elements is subjected to shear and absorbed by frictional energy, the vibration energy in the rails. In order to provide a sufficient mass for absorbing sound waves, hematite and magnetite particles are preferably introduced into the thermoplastic material.

In addition to the bonding of the damping elements with the

Rail web, a metal clip can be used, which presses the arranged on both sides of the rail web damping elements elastically against the rail web. Another solution for avoiding rail vibrations is described in DE-A-1 784 171 and provides in the web or head region of the rail a coating of a under the action of vibrations no appreciable change in shape suffering plastic, on the one or more

Metal cover plates are attached. The Kunststoffüberzug is provided from a 2-component material based on a filled synthetic resin and on the

Plastic coatings are applied metal sheets

either by gluing or by pressing the sheets mounted on the plastic in the plastic state.

Presentation of the invention

Starting from the prior art, the invention is the

The object is to propose an improved rail damping for reducing noise in railway tracks, which can be easily reused when the corresponding track section is dismantled.

This object is achieved by a profile element for damping sound vibrations on railway rails with the features of claim 1. The rail for a railway track comprising such a profile element is characterized by the

Characteristics of claim 7 described. Finally, the invention also relates to the use of a specially designed profile element for attachment to the web of a rail for noise reduction in railway tracks.

The profile element according to the invention for damping of

Sound vibrations on railway rails has a first major surface which is designed and dimensioned to be attachable as a contact surface without the provision of an adhesive layer on the rail web. The profile element further comprises at least one recess on a front surface, which is opposite to the contact surface, wherein the at least one recess in the front surface is designed for the positive engagement of an elastic fixing element for fixing the profile element against the rail web. Furthermore, the profile element comprises at least one widening in the region of the front surface, which in

Mounting position is arranged in the lower region of the front surface.

By the profile element has a designed as a contact surface and dimensioned first major surface, the

Profile element without the provision of an adhesive layer or even without the provision of a leveling layer are mounted directly on the rail web. It is important to ensure that the rail profiles have relatively high manufacturing tolerances, so that in the mounting position of the rail web and rail foot facing first main surface targeted besides the contact surface also may have areas that the

Recording of manufacturing tolerances of the railroad track can be spaced from the railroad track. Because of the specific design and sizing of the first

Main surface as a contact surface on the rail web no between the profile element and rail web to be provided adhesive layer is required, the profile element can be easily disassembled and reused elsewhere. to

Fixation of the profile element on the rail web can instead of an adhesive layer, a mechanical holding element

be provided. For the positive engagement of an elastic fixing element for fixing the

Profile element against the rail bridge is therefore

According to the invention at least one recess on a

Front surface, which is opposite to the contact surface provided. The recess serves to create an elastic

Receive fixing, with which the profile element can be pressed against the rail web and in particular clamped. According to the invention, the profile element is also shaped so that at least one widening in the region of the front surface is provided, which in the mounting position in the lower region of Front surface is arranged. In other words that's it

Profile element widened there, where it extends into the region of the rail foot. By broadening the

Profile element rail towards the total mass of the profile element is increased, causing the

Improve sound absorption properties. In addition, the damping is improved in the vertical direction. "Broadening of the profile element" is understood to mean that the thickness of the profile element increases in cross-section perpendicular to the longitudinal extension of the profile element, wherein the longitudinal extent of the profile element corresponds to the longitudinal extent of the railroad track on which the profile element is mounted in the assembly position.

The rail according to the invention for a railway track accordingly comprises such a profile element and is further characterized in that the elastic fixing element is a foot clamp which engages around the rail on one side of the rail and on the other side of the rail in one of the at least one recess of the profile element positively engages.

In an effort to enable the most effective possible damping of the sound vibrations, can continue to

Profiled element can be used, with at least one layer of fabric with warp wires and weft wires and pores formed between the warp wires and weft wires, thereby forming by the textile structure perpendicular to the surface of the fabric extending protrusions and / or depressions, which significantly improve the acoustic

Achieve absorption property, since the sound results in a much longer path and also an air cushion is formed, which increases the boundary layer on the tissue. The portion of air that forms the boundary layer has a higher viscosity than the ambient air, thereby increasing the friction for the sound penetrating the boundary layer. In this way can be through a Combination of the inventive design of the profile element available for sound absorption

increase standing mass and by providing a

suitable surface structure without a significant further increase in mass due to a different

physical mode of action further improve the absorption or dissipation of the sound.

Preferred embodiments of the invention follow from the remaining claims.

Preferably, the profile element comprises rail-side, i. in the region of the first main surface, and preferably in the lower region of the first main surface, a second

Recess. This second recess is suitable as a free space for cable entry.

According to a preferred embodiment of the invention, the profile element further comprises at least one, preferably two recesses in the region of the broadening, which in

Mounting position the rail foot for attaching a

At least partially uncover rail fastening. Since the broadening is according to the invention in the lower region of the front surface of the profile element, this extends far into the region of the rail foot, so that, depending on the geometry of the widening, not enough space for a tension clamp can be present, which rests on the rail and this against the underneath

arranged threshold spans. Alternatively, the

Profile element but also shorter, i. be of lesser length, so that there is no conflict with the

Clamp comes. By providing recesses corresponding to the usual distance of the thresholds to each other, this problem can be solved and despite the provision of an increased mass for improved sound insulation, the attachment of a rail fastening in a conventional manner. Preferably, the at least one recess of the

Profile element on the front surface so dimensioned that it receives only a single elastic fixing element. The advantage of this measure is that in this way an exact alignment in the longitudinal direction of the profile element or the railroad track can be achieved. The elastic fixing element engages positively in the

at least one recess and the recess is additionally dimensioned so that it can accommodate only an elastic fixing element. The recess can be designed so that it is a vertically arranged in the mounting direction groove. In this way, an offset of the profile elements in the longitudinal direction can be prevented.

It has proved to be advantageous if the profile element made of a thermoplastic or elastomeric plastic embedded therein, preferably homogeneously distributed

metallic or mineral, i. inorganic particles. The basic geometry of such a profile element can be preferably by extrusion and

Injection molding or other plastic processing methods produce, however, has a relatively high weight, which can improve the desired damping of acoustic vibrations. At the same time that is

Profile element weather-resistant and can easily cling to the rail web due to a certain elasticity of the geometric shape. The profile element may be made of a thermoplastic or elastomer, preferably _. consist of a polyolefin such as polypropylene.

Alternatively, the profile element is designed so that it has at least one layer of a fabric of warp wires and weft wires and pores formed between the warp wires and weft wires, wherein the fabric with a

Variety of essentially perpendicular to his

Surface extending elevations and / or depressions is provided, which preferably have a height of at least 0.5mm. The advantage of such a fabric

especially in the area of the front surface has already been

explained above and serves an improved

Acoustic insulation.

Preferably, the profile element has a length of about 500mm. Unlike conventional profile elements, which generally have a significantly greater length, the shorter profile element offers a simpler installation, an improved seat on the rail bridge in curve radii and using conventional springs a higher

Surface pressure towards the rail web.

Optionally, the profile element has two recesses which expose the rail foot, so that in the mounting position of the rail in the region of the recesses in each case a tension clamp for elastic depression of the rail foot can be used on a threshold.

Furthermore, at least one profile element is preferably mounted on both sides of the rail, whereby the damping of the sound vibrations can be optimized.

According to a preferred embodiment of the profile element, which has at least one layer of a fabric of warp wires and weft wires, these warp wires and

Weft wires of the fabric of an aluminum alloy, steel, stainless steel, aluminum or other light metal, plastic, ceramic, a copper alloy or a natural fiber.

Brief description of the drawings

The invention will be described purely by way of example with reference to an embodiment, wherein Fig. 1 is a first view of an inventive

Profile element shows;

Fig. FIG. 2 is a second view of that shown in FIG

Profile element shows; and

Fig. 3 shows schematically the section through a railway track with a profiled element according to the invention attached thereto.

Ways to carry out the invention

In the following figures, the same components are denoted by the same reference numerals.

Fig. 1 shows a view of an inventive

Profile element 10, wherein the profile element is shown from the front side and in a position corresponding to the mounting position on a horizontally laid railroad track. The main extension and thus the longitudinal direction of the

Profile element 10 extends perpendicularly to the plane of the drawing of FIG. 1. Profile element 10 has a first main surface 12 and a front surface 14 arranged opposite to first main surface 12. In the installed position shown in FIG. 3, first main surface 12 is in substantial contact with the web and foot of a rail of conventional geometry, so that a substantial part of the first major surface simultaneously forms a contact surface 16, which in the mounting position in contact with the associated

Railway track is. The radii of the first major surface are adapted to the geometry of the rail. In areas of the first main surface 12 but also specifically larger radii can be provided as corresponds to the associated railroad track to compensate for dimensional tolerances of the rail can. In this case, in particular the first region 18 and the second region 20 can each have a larger radius than corresponds to the associated rail geometry in the web region. In addition, a third region 22 is provided, in which a milling of the profile element 10 is located to a manufacturing tolerances of the associated rail

ensure full-surface concerns on the web of the rail in the area of the contact surface 16. The respective extent of the regions 18, 20 and 22 can be seen from the illustration in FIG. 3, where these regions do not rest against the rail.

On the front surface 14, the profile element on the one hand on a longitudinally extending, preferably continuous recess 24, which, as shown in the schematic

Representation of a retaining clip in Fig. 3 will be shown, for the positive engagement of an elastic

Fixing serves to press the profile element preferably resiliently against the rail web.

From Fig. 1 it is further apparent that the

Profile element 10 is provided in the region of the front surface 14 with a widening 26, which is arranged in the lower region of the front surface 14, wherein the term "bottom" refers to the mounting position in a horizontally disposed rail track. Due to the broadening 26, the mass of the profile element 10 is increased, causing the

Damping function of sound vibrations improved. In this case, due to the special arrangement of the widening 26 in the lower region of the front surface, the damping in the vertical direction is increased and the additional material is arranged in a region where this least disturbs, namely in the region of the rail foot during assembly of the profile element.

Finally, a recess 50 for

Reception of e.g. Cable can be arranged.

Only in the region of the attachment point of the rail on the thresholds, where in the usual way clamps for

elastic fastening of rails on sleepers to

Use come, the broadening 26 is disturbing, which is why at least one recess 28, preferably at each Longitudinal end of the profile a recess 28 is arranged. The geometry of the recess 28 is best seen in FIG. 2

can be seen, which in each case shows a recess 28 which is arranged at the respective longitudinal end of the profile element 10 and from the front surface 14 in the material of

Widening 26 extends into it.

On the front surface 14 of the provided at the upper end, concave radius 60 is so matched to the convex radius 61 in the processing 26 that oppositely stacked profile elements with little clearance can be stacked on each other, whereby the transport volume can be reduced and the storage is simplified.

Fig. 2 also shows extending in the vertical direction grooves 30, extending from the side of the front surface 14 into the broadening 26 and from the bottom of the

Profile element extends to the recess 24. The grooves 30 serve to provide suitable elastic fixing elements, e.g.

Metal clamps record so that these in the

Grooves 30 extend into it and prevent with a corresponding dimensioning of the width of the grooves in coordination with the width of the elastic fixing a longitudinal offset of the profile element. Preferably, a total of four grooves per profile element are provided so that when mounting each one profile element on both sides of the rail web, the mounting brackets can be offset from each other.

FIG. 3 shows a conventional rail 32 with rail head 34, rail web 36 and rail foot 38. The profile element 10 shown in FIG. 1 is shown in FIG. 3 in FIG

Mounting position arranged on the rail web 36, wherein the profile element 10 in the region of the contact surface 16 on

Rail web and rail foot rests. In the area 22, the profile element 10 does not abut against the rail to

Manufacturing tolerances, especially in the radius between rail head and rail bridge, as well as between

Include rail bridge and rail foot. Compared to the embodiment of FIG. 1, the profile element of FIG. 3 has no second recess for cable entry.

As can be seen in FIG. 3, the profile element rests directly on the rail, the term "direct" meaning that there is no leveling layer or adhesive layer between the profile element and the stock rail 32. Nevertheless, a secure system and a suitable contact pressure between profile element and stock rail

ensure at least two retaining clips 40 are provided for each profile element, the 40a in the area

Surround rail on the side facing away from the profile element of the rail, run under the rail and guided on the profile element facing the side of the rail around and preferably one in FIG

Pass through the groove shown and press with the area 40b in the recess 24 of the profile element. In this way, the profile element 10 without using a

Adhesive layer fixed to the stock rail, wherein after removing the retaining clip 10, the profile element conveniently disassembled from the stock rail and elsewhere again

can be used.

In the example shown in FIG. 3, a profile element 10 is arranged on only one side of the rail, but this is preferably arranged on both sides of the rail, the retaining clip being arranged in mirror image to the exemplary retaining clip shown in FIG another, not shown in Fig. 3 profile element also to tension against the rail web.

The profile element shown in Fig. 1 may be made of a thermoplastic or elastomeric plastic, in the metallic or mineral, such as inorganic particles are embedded, which are compatible with the Extrude plastic material, injection molding or can be produced by typical plastic processing methods and have the function of the mass of the

Increase profile element. Alternatively and additionally, it is also possible to provide a multilayer structure, wherein a structure can be provided, as described in DE 20 2008 014 701 Ul, which describes that provided on a suitable absorbent material at least one layer of a fabric with warp wires and weft wires with pores formed between the warp wires and weft wires, and the fabric having a plurality of substantially perpendicular to it

Surface extending elevations and / or depressions is provided, which have a height of at least 0.5mm. For the exact description of such a layer material reference is made to the disclosure of DE 20 2008 014 701 Ul. A corresponding tissue layer can be arranged both on the first main surface 12 and front surface 14 of the profile element 10.

As an alternative to the specific layer structure described in DE 20 2008 014 701 Ul, however, a layer structure can also be used

Layer structure consisting of thermoplastic material with metal particles and / or mineral particles with a corresponding fabric layer with warp wires and

Weft wires are combined on their surface.

It is crucial, however, that although the profile element 10 itself may consist of different layers that are laminated together, but the profile element can be fastened to the stock rail without the use of a Klebstoffschient.

By the profile element according to the invention is without the

Use of an adhesive layer optimal coupling to the rail web possible and by the broadening of the profile element to the rail foot towards the mass and the damping is increased in the vertical direction. The waiver of adhesive but also requires a simple disassembly and reuse of the profile element.

Claims

claims

Profile element for damping of sound vibrations on railway rails (32), wherein the profile element {10} has a first main surface (12) which is designed and dimensioned to partially as a contact surface (16) without the

Providing an adhesive layer to be positionable on the rail web (36); the

Profile element (10) further comprises: at least one recess (24) on one

Front surface (14), which is opposite to the contact surface (16), wherein the at least one recess (24) in the front surface (14) for

positive engagement of an elastic

Fixing element (40) for fixing the

Profile element (10) is designed against the rail web (36); and at least one broadening (26) of the

Profile element (10) in the region of the front surface (14), which is arranged in the mounting position in the lower region of the front surface (14).

Profile element according to claim 1, further comprising a second recess (5) on the first main surface (12), which is suitable for cable feedthrough,

Profile element according to claim 1 or 2,

characterized in that

the profiled element (10) has at least one layer of a fabric (42) of warp wires and weft wires and pores formed between the warp wires and weft wires, and the fabric having a plurality of is provided substantially perpendicular to its surface extending elevations and / or depressions, preferably a height of each

at least 0.5mm.

4. Profile element according to one of the preceding claims, characterized in that

the at least one recess (24, 30) on the

Front surface is partially dimensioned so that it receives only an elastic fixing element (40).

5. Profile element according to one of claims 1 to 4 _r further comprising at least one, preferably two

Recesses (28) in the region of the widening (26), which at least partially expose the rail foot (38) for mounting a rail fastening in the mounting position.

6. Profile element according to one of the preceding claims, characterized in that

the profile element (10) of a thermoplastic or elastomeric plastic with embedded therein,

preferably homogeneously distributed, metallic or mineral particles.

7. Profile element according to one of the preceding claims, characterized in that

the profile element has a length of about 500mm.

8. Including rail for a railroad track

Profile element according to one of the preceding claims, characterized in that

the elastic fixing element is a foot clip (40) which engages on one side of the rail (32) the rail foot (38) and on the other side of the rail (32) in one of the at least one recess (24, 30) of the profile element ( 10) engages positively.

9. Rail according to claim 8,

characterized in that

on both sides of the rail (32) at least one

Profile element (10) is mounted.

10. Use of a profile element (10) with at least

a layer of a fabric (42) with warp wires and weft wires and between the warp wires and

Weft wires formed pores for attachment to the rail web (36) of a rail (32) for

Noise reduction in railway tracks.

Use according to claim 10, wherein the warp and weft wires of the fabric are of aluminum alloy, steel, stainless steel, aluminum or another

Alloy, plastic, ceramic, a copper alloy or a natural fiber.