WO2011095325A1

WO2011095325A1 - Track bed mat for a railway superstructure

Info

Publication number: WO2011095325A1
Application number: PCT/EP2011/000463
Authority: WO
Inventors: Gerd GRÜTZE; Hubert Christoph Schwind
Original assignee: Edilon Sedra Gmbh
Priority date: 2010-02-02
Filing date: 2011-02-02
Publication date: 2011-08-11
Also published as: EP2531652A1; PL3002368T3; EP3002368B1; DE202010001748U1; PL2531652T3; EP3002368A1; EP2531652B1

Abstract

The invention relates to a railway superstructure comprising a track bed mat (10) as a continuous support of a track carrier system. The track bed mat (10) either consists of rubber recycling material having a polyurethane bond, or of polyurethane having a special specification, and has holes that run transversely to the mat plane such that a particular resilience effect with a static bed module between 0.005 to 0.08 N/mm²and a dynamic bed module between 0.02 to 0.1 N/mm² is achieved.

Description

Trackbed mat for a railway superstructure

description

Field of the invention

The invention relates to a railway superstructure with elastic pad, in particular track mat or

Gravel subway to reduce vibrations on track systems for rail vehicles.

Background of the invention

Such a railway superstructure is known from EP 0 922 808 A2. As a base, a two-layer, resilient mat is used, the upper layer consists of Polyurethanangundenem rubber granulate and the lower layer of a rock wool plate. One of the tasks of this resilient mat is to hinder the generation and propagation of low-frequency sound. Together with the resilient mat of the railway superstructure forms a mass-spring system that leads to the correct tuning of the spring to an effective sound-absorbing storage of the tracks and thus the rails.

Another sound-insulating storage of tracks is known from DE 199 52 803 AI. There will be the spring of

Mass-spring system of a so-called Entropie- elastic mat of polyurethane or natural or

Synthetic rubber formed with a thickness between 15 mm and 40 mm.

CONFIRMATION COPY A crushed stone layer on low-lying

Elastomer layer, which lies between the superstructure and the ground, is known from DE 10 2006 013 851 AI and serves to reduce vibrations on railway tracks.

Mats made of polyurethane or rubber can

production technology to suitable spring constant or

Young's modulus can be adjusted at a

Railway superstructure to produce a mass-spring system with a low tuning frequency below 100 Hz, however, the production of such mats is quite expensive.

General description of the invention

The invention is therefore based on the object to provide a resilient mat for railway superstructure, the suspension behavior in the mass-spring system formed with the railway superstructure to a low

Voting frequency below 100 Hz leads and their

Manufacturing causes low costs.

The stated object is achieved in that as

resilient mat is a track mat made of polyurethane-bonded rubber recycling material. Further, perforations are disposed in the mat across the plane of the mat, which are distributed over the surface and can form a grid and make up a volume fraction in the range of 10 to 40% of the volume of the mat. The

Trackbed mats are preferably of a density in the

Range of 360 to 580 kg / m ³ for tram operation and in the range of 580 to 700 kg / m3 for the Full course area trained. The plate thickness is in the range of 10 to 50 mm.

The starting material for producing the resilient mats can be procured inexpensively, and also the

Making perforated mats or sheets is not expensive. While a solid material mat or sheet of polyurethane-bonded rubber recycling material tends to show too low compliance, which does not

desired spring properties corresponds when the

necessary carrying capacity is taken into account, is created by the perforations a resilient compliance of the perforated mat or plate, which corresponds to the desired spring property, while at the same time the necessary load capacity is achieved. This is made possible by the fact that close-hole material of the mat at

can displace dynamic load in the space of the holes into it, but with dynamic relief, the material displaced in the hole space spring returns to its original position resiliently. The mat thus shows the overall behavior of a soft spring, while the load capacity of the mat withstands the stresses of driving on the tracks. The width of the perforations is freely selectable in a large area. For the production of perforated mats, a range of diameters of 5 to 30 mm is well suited.

The suspension behavior of the perforated mat or plate can be described with the so-called bedding module. The static bedding modulus (for static loads) should be in the range of 0.005 to 0.08 N / mm ² and the dynamic Modulus be in the range of 0.02 to 0.1 N / mm ² . An excellent value of the static bedding modulus is 0.014 N / mm ² and of the dynamic bedding modulus 0.04 N / mm ² at a material thickness of 23 mm. At a stress σ of

0.025 N / mm ² , the mat lowers about 1.7 mm. (In the

Comparison: A bearing plate of 65 Shore A lowers at the same load only 0.2 mm.) Preferably, it is sufficient if the maximum permissible compressive stress of the trackbed mat is less than 2 N / mm ² .

To achieve the low bedding modulus, it is beneficial if the gum recycled material is fibrous material

contains, as it arises during the crushing of old tires. The rubber fibers thus obtained can be present in a length range of 1 to 20 mm and make up a proportion of between 20 and 90% of mat material. Rubber granulates with a grain size between 1 and 5 mm can account for up to 60% of the mat material. The task is also solved by the

Track bed mat (10) made of polyurethane of a specification as follows:

Tensile strength:> 0.4 MPa

Breaking strength:> 200%

Static pressure module: 0.06 to 0.42 MPa

Dynamic pressure modulus: 0.21 to 0.51 MPa

Tear resistance:> 10N / cm and that the trackbed mat (10) across the mat plane

Having perforations (11) distributed over the mat surface and having such a thickness, that a suspension behavior with a static

Ballast modulus in the range of 0.005 to 0.08 N / mm ² and with a dynamic ballast modulus in the range of 0.02 to 0.1 N / mm ² for the mat as such is achieved.

Brief description of the figures

Embodiments of the invention will be described with reference to the following figures. 1 shows a cross section through a railway superstructure, FIG. 2 shows a cross section through a roadway with

Tram track and

Fig. 3 is a perforated track mat. Detailed description of the invention

The railway superstructure shown in Fig. 1 forms a track with two rails 1, with concrete sleepers 9 and a ballast layer 6. Below the ballast layer 6, a film or a fabric 7 may extend, as is known. The railway superstructure is closed to the ground 8 through a trackbed mat 10 which extends in length and width under the entire ballast layer 6 and consists of polyurethane-bonded rubber recycling material, as will be described in detail below.

The trackbed mat 10 is made of individual plates of z. B 2000 x 1000 mm Dimensions, if necessary combined with waste. For a uniform embedding too

achieve, the track mat is preferably applied in two layers with non-intersecting shocks. The thickness of a ballast bed is 300 to 390 mm in Depending on the design speed and can be divided into two layers, with one layer of the trackbed mat as an intermediate layer and the other layer as a sub-camp of the ballast bed. The elastic

Compliance of the two layers is such that the desired embedding results. For this purpose, the

Plate thickness and the plate density, taking into account the volume fraction of the perforations 11 chosen suitable for the respective application areas.

The road surface shown in Fig. 2 is constructed in layers and includes tram rails 1, which in interposed Kammerfüllelementen 2 in a

Pavement layer is included as a pavement 3. The rails 1 are mounted on a concrete slab 5, which may have a thickness between 200 and 400 mm. Between rail foot and concrete slab 5 is an elastic

Mounting plate 4 added to the sound generation when

Driving down the tram track to diminish.

The trackbed mat 10 is shown in more detail in Fig. 3 and has a plate thickness in the range of 10 to 50 mm. The dimensions depend on the application and may include plates with lengths of 1000 to 2000 mm and widths of 500 to 1000 mm. In the plate body across the

Plate level holes are regularly attached 11, which are formed continuously or as blind holes. The

Volume of the holes 11 is 10 to 40% of

Plate volume of the mats 10. The hole diameter is in the range of 5 to 30 mm. The mats are made of recycled rubber bonded by polyurethane. You first press thicker blocks and split in a later

Process step from individual plates of the desired thickness. With the pressing of the block, the holes 11 are attached at the same time by pressing ram through the

Holes a tool hole plate are pressed into the not yet cured material of the block. In this way, the perforations 11 are surrounded by a casting skin, which represents the quality of the mat of

Meaning is. The production takes place under a certain pressing pressure to a desired density of the plate in the

To achieve their respective application. The exact measure of the density will take into account the required load capacity and the desired

Yield of the mat adjusted. The denser the mat, the less yielding it is. On the other hand, the static and dynamic loads must be handled by the mat, which in turn requires a certain density of the webs 12 between the holes 11.

Recipe of the mat material

weight

Fibers 20 - 90 o

Granules 1-5 mm grain size 0 - 60%

Polyurethane MDI Prepolymer 3 - 15%

Polyols 3 - 15%. example

weight

Fibers 1-5 mm long 24%

Fibers 8-20 mm long 5%

Granules 1-5 mm grain size 55%

Polyurethane MDI prepolymer

polyols

A punched unreinforced mat of density 480 kg / m ³ with a thickness of 23 mm and perforations of 15 mm diameter was produced. The yield of the

Track bed mat is measured by the ballast module according to DIN 45673-7. In the embodiment, the

static bed modulus C _st at ~ 0.014 N / mm ² at σ = 0.025 N / mm ² . The dynamic bedding modulus was ~ 0.04 N / mm ² at σ = 0.03 N / mm ² and 40 Hz. The maximum allowable

Compressive stress in this mat was 0.15 N / mm ² .

The specially described mat is for the elastic storage and structure-borne noise of buildings and

Railways suitable. It is created in this environment, a mass-spring system with which the relevant

Einfüdenämmmaß due to the low ballast modules of the mat is achieved. In the static area is the

Depression of the perforated mat at a stress σ of 0.025 N / mm ² at about 1.7 mm and thus meets the criterion of a static bedding modulus C _stat of 0.014 N / mm ³ at 23 mm material thickness.

It should be noted that the elastic support plate 4 of a polyurethane plate or a rubber plate with a Shore A hardness of 65 may exist to accommodate the significant surface load on the rail. In such a plate sets a depression, which is 10 times smaller than would be set at the same load, if 5 an equally sized plate of the mat training 10th

would be used. Therefore, bearing plates 4 are unsuitable as trackbed mats 10, it lacks the necessary compliance. Conversely, plates are the type of

Trackbed mats 10 unsuitable as bearing plates 4, because their 10 permissible compressive stress are too small for the significant loads below the rail foot.

The trackbed mats 10 can also be made of polyurethane

be prepared if by suitable perforations in

15 matching thick mats 10 made sure that one

Suspension behavior with sufficient depression in the

Rail operation or in the operation of a train is achieved. The suspension behavior is determined by the static and dynamic bedding modulus used for static

20 bedding modulus should be in the range of 0.005 to 0.08 N / mm ² and for the dynamic bed modulus in the range of 0.02 to 0.1 N / mm ² .

For rail transport developed polyurethane plates 25 have the following mechanical properties:

Properties Standard Value Unit Remarks

Tensile strength ISO 1798> 0.5 MPa

Elongation at break ISO 1798> 250%

Stat. Pressure module at + 23 ° C DIN 45673-7 0, 42 MPa 0, 005-0.02MPa

0, 12 MPa 0, 01-0.04MPa

Dyn. Pressure module at + 23 ° C DIN 45673-7 0,29-0,51 MPa 5-30 Hz at 0, 03

MPa preload

Dissipation factor (tangent DIN 45673-7 0, 3 - 5-30 Hz at 0, 03 delta) MPa preload

Permanent swelling test with 3 DIN 45673-7 <11% load range million load cycles at 0, 01-0, 03 MPa 3 Hz, load ranges <8% Load range 0.01-0.03 and 0.01-0.05 0, 01-0.05 MPa MPa: Difference in stat.

print module

Dyn. Water absorption test DIN 45673-7 <11% wet

24h at 0.3 Hz (additional) <4% Dry again Load range 0.02-0.06 MPa: difference in

stat. print module

Pressure module at -20 ° C DIN 45673-7 0, 13 MPa Stat .: 0,01-0,04

MPa

0, 56-1, 06 MPa Dyn.: 5-30 Hz 0, 03

MPa preload

Pressure module at + 50 ° C DIN 45673-7 0, 13 MPa Stat .: 0,01-0,04

MPa

0, 26-0, 47 MPa dyn.: 5-30 Hz 0, 03

MPa preload

Glass transition temperature ASTM D 4065 - 30 ° C DTMA "dual

(DMTA) IEC 61006 cantilever "test at 1 Hz, + 2 ° C / min size test pattern 10x15x60 mm

Tear strength ASTM D> 10 N / cm

3574 / F

Compression set according to ISO 1856 B <5%

7 days at + 23 ° C (50%)

Also useful are polyurethane plates with the following

mechanical properties:

5 Such plates are produced with perforations 11, wherein preferably the mat 10 thus produced with a

Casting skin is provided. The dimensions of the polyurethane mat are in the range of dimensions of the track bed mats 10 of recycled rubber material but with a tendency to thinner web walls 12.

It will be apparent to those skilled in the art that the above-described embodiments are to be understood by way of example, and that the features, independently as they are disclosed in the specification, claims, figures, or otherwise, also individually define essential components of the invention, even if they do described together with other features.

Claims

Claims:

1. Railway superstructure comprising:

a track-laying system (5, 6, 9),

on this mounted rails (1) and

a trackbed mat (10) as a continuous support of the trackage system,

characterized,

in that the trackbed mat (10) consists of polyurethane-bonded rubber recycling material and has perforations (11) across the plane of the mat, which over the

Mat surface distributed. 2. Railway superstructure comprising:

a track-laying system (5, 6, 9),

on this mounted rails (1) and

a trackbed mat (10) as a continuous base of

Track support system

characterized,

that the track bed mat (10) made of polyurethane

Specification is as follows

Tensile strength:> 0.4 MPa

Breaking strength:> 200%

Static pressure module: 0.06 to 0.42 MPa

Dynamic pressure modulus: 0.21 to 0.51 MPa

Tear strength:> 10N / cm

and that the trackbed mat (10) has perforations (11) across the mat plane, which are distributed over the mat surface, and such a thickness

that has a suspension behavior with a

static bedding modulus in the range of 0.005 to 0.08 N / mm ² and with a dynamic ballast modulus in the range of 0.02 to 0.1 N / mm ² for the mat as such.

3. Railway superstructure according to claim 1 or 2,

wherein the perforations (11) give a volume fraction of 10% to 40% of the mat volume.

4. Railway superstructure according to one of claims 1 to 4,

characterized in that the trackbed mat (10) has a mat thickness in the range of 10 to 50 mm.

5. railway superstructure according to one of claims 1 to 4,

characterized in that the hole diameter is in the range of 5 to 30 mm.

6. railway superstructure according to one of claims 1 to 5,

characterized in that the trackbed mat (10) is constructed of individual, juxtaposed plates.

7. railway superstructure according to claim 6,

characterized in that the plates have length dimensions in the range of 1000 to 2000 mm and width dimensions in the range of 500 to 1000 mm.

8. railway superstructure according to claim 6 or 7,

characterized in that two layers of plates are provided whose joints do not overlap.

9. railway superstructure according to one of claims 1 to 8,

characterized in that the track bed mat (10) in full length and width of the track bed

extends.

Railway superstructure according to claim 1,

characterized in that the trackbed mat (10) has a density in the range of 360 to 580 kg / m ³ .

Railway superstructure according to claim 1,

characterized in that the trackbed mat (10) has a density in the range of 580 to 700 kg / m ³ .

Railway superstructure according to claim 1,

characterized in that the recycled material contains gum fibers and rubber granules.

Railway superstructure according to claim 12,

characterized in that the rubber fibers have a length in the range of 1 to 20 mm and a

Weight proportion in the range of at least 20% to make up 90% of the mat material.

Railway superstructure according to claim 12 or 13,

characterized in that the rubber granules have a grain size in the range of 1 to 5 mm and a weight fraction in the range of 0% to 60% on

Make up mat material.

15. Railway superstructure according to one of claims 12 to 14, characterized in that the rubber fibers are present in lengths of T ₂ = 1 to 5 mm and T ₃ = 8 to 20 mm.

16. Railway superstructure according to claim 1,

characterized in that the polyurethane has a weight fraction in the range of 3 to 15%.

17. Railway superstructure according to claim 1,

characterized in that the trackbed mat (10) has a low ballast modulus for static loads in the range of 0.005 to 0.08 N / mm ² and for dynamic loads in the range of 0.02 to 0.1 N / mm ² .

18. Railway superstructure according to claim 2 or 17,

characterized in that the static

Modulus of curvature C _sta t 0.014 N / mm ² ± 0, 0028 N / mm ² .

19. Railway superstructure according to claim 2 or 17,

characterized in that the dynamic

Bedding modulus C _dyn 0.04 N / mm ² ± 0.008 N / mm ² .