EP1180174A1 - Elastomer tie pad for the support of a railway rail on a sleeper - Google Patents

Elastomer tie pad for the support of a railway rail on a sleeper

Info

Publication number
EP1180174A1
EP1180174A1 EP00931309A EP00931309A EP1180174A1 EP 1180174 A1 EP1180174 A1 EP 1180174A1 EP 00931309 A EP00931309 A EP 00931309A EP 00931309 A EP00931309 A EP 00931309A EP 1180174 A1 EP1180174 A1 EP 1180174A1
Authority
EP
European Patent Office
Prior art keywords
cavity
sole according
sole
rail
sleeper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00931309A
Other languages
German (de)
French (fr)
Other versions
EP1180174B1 (en
Inventor
Christian Noel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avon Protection PLC
Original Assignee
AVON SPENCER MOULTON
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AVON SPENCER MOULTON filed Critical AVON SPENCER MOULTON
Publication of EP1180174A1 publication Critical patent/EP1180174A1/en
Application granted granted Critical
Publication of EP1180174B1 publication Critical patent/EP1180174B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00—Fastening rails on sleepers, or the like
    • E01B9/68—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
    • E01B9/685—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape
    • E01B9/686—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape with textured surface

Definitions

  • the present invention relates to an elastomer sole for the support of a railway rail on a sleeper.
  • soles such as that described in the
  • FR 2 630 466 of the type comprising a lower face in contact with the cross member and an upper face in contact with the rail, and at least one cavity providing a peripheral support zone for the rail shoe.
  • the stiffness of these soles varies hyperbolic as a function of the support forces exerted by the rail during the passage of a train, which does not make it possible to obtain satisfactory damping of the vibrations of the rail and in particular of the audible vibrations. (500-5000 Hz) of the rail in the free state or good filtration of the high energy vibrations of the rail in the loaded state, mainly due to major faults in the rail / wheel contact.
  • the present invention aims to solve this technical problem reliably and effectively by optimizing the mechanical behavior of the sole in response to rail vibrations; this optimization being carried out by acting in particular on the formulation of the elastomer and / or the geometry of the sole.
  • peripheral support zone is flat and its surface is between one and ten times the surface of the internal side wall of said cavity, so that the ratio of secant stiffnesses taken respectively between static load values of 20 and 100 KN and dynamic overload values of 20 and 80 KN, is greater than or equal to 0.45.
  • the secant stiffness is comparable to the slope of the straight line joining two points corresponding to the deflections measured for extreme load or overload values.
  • the secant static or dynamic stiffness (which is relative to the sudden variations in loads due to shocks) is defined as being equal to the ratio of a quarter of the axle load by the deflection due to this single load therefore deducting the sinking caused by the intrinsic and permanent load of the track elements (rail, cross member, fasteners ).
  • the overload corresponds to a total load resulting from the sum of the static load and the dynamic overload due to shocks.
  • this ratio of secant stiffnesses corresponds to the filtering power of the sole and translates the effectiveness of filtering, when the sole is subjected to the effects resulting from major faults in the rail / wheel contact.
  • said cavity is located so that the minimum stiffness is located on the median axis of the upper face so as to possibly limit the rotation of the rail under the effect of lateral forces.
  • said cavity has generatrices parallel to the normal to the upper face.
  • said cavity is cylindrical and opens onto the underside of the sole.
  • said cavity has an axis of revolution and has an internal side wall with a curvilinear periphery and preferably oval.
  • the periphery of said cavity is oval.
  • said cavity has a polygonal contour.
  • This specific geometry of the cavity limits the creep of the elastomer towards the interior of the cavity, which allows a saving of material.
  • said sole is made with an elastomeric material whose elasticity modulus is substantially stable over a temperature range between 0 ° C and 40 ° C.
  • the depth of said cavity represents at least 80% of the total thickness.
  • said cavity is unique and centered on the upper face.
  • the sole has six cavities.
  • the thickness of the sole is between 4 and 12 mm, and preferably between 7 and 9 mm.
  • the sole of the invention provides a significant reduction in the air noise generated by the vibrations of the rail during the passage of trains compared to known resilient soles of the fluted or studded type.
  • This weakening of noise pollution is also accompanied by a reduction in the wear of track components (cross member, fasteners, ballast %) and thus allows an extension of their service life while jointly offering savings. substantial maintenance costs.
  • the sole of the invention has, at low load, greater stiffness than traditional soles, which facilitates the initial operations of laying and adjusting the rail during the production of the track.
  • this property allows at the same time to reduce the stresses of which the sole is the seat at rest under load, which reduces the fatigue of the sole.
  • FIG. 1B to 6 show top views of various embodiments of the sole of the invention;
  • FIG. 1A shows a cross-sectional view of the embodiment of Figure 1B;
  • Figure 7 is a graph showing the filtering powers of the embodiments of Figures 1B to 6 and those of anterior soles.
  • FIGS. 8A and 8B are graphs comparing deflections obtained under different loads with the soles according to the invention, respectively with respect to the prior art and with each other.
  • FIGS. 9A and 9B show the variations of the tangential stiffness as a function of the load by comparing the soles of the invention, respectively with respect to the anterior soles and with each other.
  • the sole 1 shown in Figures IB to 6 is intended to be mounted on a railway sleeper in order to support a rail (not shown).
  • This sole includes an upper face 1a in contact with the rail pad and a lower face 1b in contact with the crosspiece.
  • the central axis X of the sole corresponds to the normal position for supporting the rail.
  • the sole comprises at least one cavity 10, preferably opening onto the underside 1b, providing a peripheral zone 11 for the support of the rail shoe, in the embodiments of FIGS. 1 to 5, the sole comprises a single cavity while in that of Figure 6, it has six cavities.
  • the lateral edges of the sole 1 are provided with notches 12 intended to prevent or at least limit the path of the rail by cooperation with the fastening device (not shown).
  • the support zone 11 is always flat and its surface is between one and ten times the surface of the internal side wall 10a of the cavity 10.
  • the coefficient known as shape, corresponding to the ratio of these two surfaces, is given in the table below.
  • This specific geometry makes it possible to obtain a vibration filtration power greater than or equal to 0.45 for extreme values of static load of 20 and 100KN and dynamic overload of 20 and 80KN.
  • the filtration power is defined as being the ratio of the secant stiffnesses corresponding respectively to the static loads and dynamic overloads considered.
  • the values obtained, according to the invention for this power, are given in the table below.
  • the sole is made of an elastomeric material whose elasticity modulus is substantially stable over a temperature range between 0 ° c and 40 ° C.
  • the cavity is here unique and centered on the sole 1, but more generally, this cavity is positioned so that the
  • the cavity 10 is cylindrical and its internal lateral wall has generatrices parallel to the normal to the upper face 1a while its depth represents at least 80% of the total thickness of the sole 1 as shown in FIG. 1A where a veil remains 13 of material forming the bottom 10b. If necessary, this veil 13 can extend in an intermediate manner in the cavity 10, between the level of the upper and lower faces.
  • the bottom 10b closes, upwards, the cavity 10, thus preventing any penetration of water or foreign particles, and ensuring, in addition, good electrical insulation of said cavity so as to avoid the appearance of an electric arc. inside the latter.
  • the thickness of the sole is generally between 4 mm and 12 mm, depending on the applications envisaged.
  • the embodiments exemplified here and presented in the table and the graphs correspond to respective thicknesses of 7 mm and 9 mm.
  • the cavity 10 has an axis of revolution and has an internal side wall 10a whose profile is curvilinear.
  • the periphery of the cavity 10 is oval while in FIGS. 2 and 3, this periphery is circular.
  • the cavity 10 has a polygonal contour in rhombus and square respectively.
  • the cavities have a circular peripheral edge.
  • the table below gives, on the one hand, for different embodiments of the sole according to the invention, and on the other hand, for other previous soles, the corresponding values of the form coefficients and those of the filtering powers.
  • the graph in FIG. 7 represents the values of the filtering power as a function of the secant static stiffness for different embodiments of the sole of the invention (dotted frame) and for the anterior soles.
  • the graphs in FIGS. 8A and 8B represent the variations in deflection as a function of the load applied for different embodiments of the invention compared to anterior flanges.
  • the graphs of FIGS. 9A and 9B represent the variations of the tangential stiffness compared between the different embodiments of the invention and of the anterior soles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Railway Tracks (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Springs (AREA)
  • Laminated Bodies (AREA)
  • Vibration Dampers (AREA)

Abstract

The invention relates to an elastomer tie pad for the support of a railway rail on a sleeper, comprising upper (1a) and lower (1b) surfaces and at least one cavity (10a) forming a peripheral bearing area (11) for the foot of the rail. The invention is characterized in that the peripheral bearing area is planar and the surface thereof is 1-10 times the size of the surface of the inner side wall (10a) of the cavity (10), whereby the ratio of the secant stiffnesses which are measured respectively between the static load values i.e.20-100 KN and the dynamic overload values i.e.20-80KN is equal to or greater than 0.45.

Description

SEMELLE EN ELASTOMERE POUR LE SUPPORT D'UN RAIL DE CHEMIN DE FER SUR UNE TRAVERSE La présente invention concerne une semelle en élastomère pour le support d'un rail de chemin de fer sur une traverse. II existe des semelles telles que celle décrite dans le The present invention relates to an elastomer sole for the support of a railway rail on a sleeper. There are soles such as that described in the
FR 2 630 466 du type comprenant une face inférieure au contact de la traverse et une face supérieure au contact du rail, et au moins une cavité ménageant une zone périphérique d'appui pour le patin de rail.FR 2 630 466 of the type comprising a lower face in contact with the cross member and an upper face in contact with the rail, and at least one cavity providing a peripheral support zone for the rail shoe.
Cependant, la raideur de ces semelles varie de façon hyperbolique en fonction des efforts d'appui exercés par le rail lors du passage d'un train, ce qui ne permet pas d'obtenir un amortissement satisfaisant des vibrations du rail et notamment des vibrations audibles (500-5000 Hz) du rail à l'état libre ni une bonne filtration des vibrations à haute énergie du rail à l'état chargé, dues essentiellement à des défauts majeurs du contact rail/roue.However, the stiffness of these soles varies hyperbolic as a function of the support forces exerted by the rail during the passage of a train, which does not make it possible to obtain satisfactory damping of the vibrations of the rail and in particular of the audible vibrations. (500-5000 Hz) of the rail in the free state or good filtration of the high energy vibrations of the rail in the loaded state, mainly due to major faults in the rail / wheel contact.
Il en résulte des nuisances acoustiques importantes ainsi qu'une usure prématurée des divers éléments de support (traverse, ballast, plate-forme...) et de fixation (ressort, lame, butée...) du rail.This results in significant noise pollution and premature wear of the various support elements (cross member, ballast, platform ...) and fixing (spring, blade, stop ...) of the rail.
La présente invention a pour but de résoudre ce problème technique de manière fiable et efficace en optimisant le comportement mécanique de la semelle en réponse aux vibrations du rail ; cette optimisation étant conduite en agissant notamment sur la formulation de l'élastomère et/ou la géométrie de la semelle.The present invention aims to solve this technical problem reliably and effectively by optimizing the mechanical behavior of the sole in response to rail vibrations; this optimization being carried out by acting in particular on the formulation of the elastomer and / or the geometry of the sole.
Ce but est atteint selon l'invention au moyen d'une semelle du type précédent, caractérisée en ce que de la zone périphérique d'appui est plane et sa surface est comprise entre une et dix fois la surface de la paroi latérale interne de ladite cavité, de façon à ce que le rapport des raideurs sécantes prises respectivement entre des valeurs de charge statique de 20 et 100 KN et des valeurs de surcharge dynamique de 20 et 80 KN, soit supérieur ou égal à 0,45.This object is achieved according to the invention by means of a sole of the previous type, characterized in that the peripheral support zone is flat and its surface is between one and ten times the surface of the internal side wall of said cavity, so that the ratio of secant stiffnesses taken respectively between static load values of 20 and 100 KN and dynamic overload values of 20 and 80 KN, is greater than or equal to 0.45.
La raideur sécante est assimilable à la pente de la droite joignant deux points correspondant aux déflexions mesurées pour des valeurs de charges ou de surcharges extrêmes.The secant stiffness is comparable to the slope of the straight line joining two points corresponding to the deflections measured for extreme load or overload values.
La raideur sécante statique ou dynamique (qui est relative aux variations brutales de charges dues aux chocs) est définie comme étant égale au rapport du quart de la charge à l'essieu par la déflexion due à cette seule charge en déduisant donc l'enfoncement provoqué par la charge intrinsèque et permanente des éléments de la voie (rail, traverse, attaches...).The secant static or dynamic stiffness (which is relative to the sudden variations in loads due to shocks) is defined as being equal to the ratio of a quarter of the axle load by the deflection due to this single load therefore deducting the sinking caused by the intrinsic and permanent load of the track elements (rail, cross member, fasteners ...).
En outre, la surcharge correspond à une charge totale résultant de la somme de la charge statique et de la surcharge dynamique liée aux chocs.In addition, the overload corresponds to a total load resulting from the sum of the static load and the dynamic overload due to shocks.
Ainsi, ce rapport des raideurs sécantes correspond-t-il au pouvoir filtrant de la semelle et traduit l'efficacité du filtrage, lorsque la semelle est soumise aux effets résultant des défauts majeurs du contact rail/roue.Thus, this ratio of secant stiffnesses corresponds to the filtering power of the sole and translates the effectiveness of filtering, when the sole is subjected to the effects resulting from major faults in the rail / wheel contact.
Selon une caractéristique avantageuse de l'invention, ladite cavité est localisée de telle sorte que le minimum de raideur soit situé sur l'axe médian de la face supérieure de façon à limiter éventuellement la rotation du rail sous l'effet d'efforts latéraux. Selon une autre caractéristique, ladite cavité a des génératrices parallèles à la normale à la face supérieure.According to an advantageous characteristic of the invention, said cavity is located so that the minimum stiffness is located on the median axis of the upper face so as to possibly limit the rotation of the rail under the effect of lateral forces. According to another characteristic, said cavity has generatrices parallel to the normal to the upper face.
Selon encore une autre caractéristique, ladite cavité est cylindrique et débouche sur la face inférieure de la semelle.According to yet another characteristic, said cavity is cylindrical and opens onto the underside of the sole.
De préférence, ladite cavité a un axe de révolution et possède une paroi latérale interne à pourtour curviligne et de préférence ovale.Preferably, said cavity has an axis of revolution and has an internal side wall with a curvilinear periphery and preferably oval.
Selon une première variante, le pourtour de ladite cavité est ovale.According to a first variant, the periphery of said cavity is oval.
Selon une autre variante, ladite cavité a un contour polygonal.According to another variant, said cavity has a polygonal contour.
Cette géométrie spécifique de la cavité limite le fluage de l'élastomère vers l'intérieur de la cavité, ce qui permet une économie de matière.This specific geometry of the cavity limits the creep of the elastomer towards the interior of the cavity, which allows a saving of material.
Selon encore une autre caractéristique, ladite semelle est réalisée avec un matériau élastomère dont le module d'élasticité est sensiblement stable sur une plage de température comprise entre 0°C et 40°C.According to yet another characteristic, said sole is made with an elastomeric material whose elasticity modulus is substantially stable over a temperature range between 0 ° C and 40 ° C.
Selon d'autres caractéristiques, la profondeur de ladite cavité représente au moins 80% de l'épaisseur totale.According to other characteristics, the depth of said cavity represents at least 80% of the total thickness.
Selon une variante de réalisation, ladite cavité est unique et centrée sur la face supérieure. Selon une autre variante, la semelle comporte six cavités.According to an alternative embodiment, said cavity is unique and centered on the upper face. According to another variant, the sole has six cavities.
Selon encore une autre caractéristique, l'épaisseur de la semelle est comprise entre 4 et 12 mm, et de préférence, entre 7 et 9 mm.According to yet another characteristic, the thickness of the sole is between 4 and 12 mm, and preferably between 7 and 9 mm.
La semelle de l'invention procure une réduction significative du bruit aérien généré par les vibrations du rail lors du passage des trains par rapport aux semelles resilientes connues du type cannelées ou à plots.The sole of the invention provides a significant reduction in the air noise generated by the vibrations of the rail during the passage of trains compared to known resilient soles of the fluted or studded type.
Cet affaiblissement des nuisances sonores s'accompagne en outre, d'une diminution de l'usure des composants de la voie (traverse, attaches, ballast...) et permet ainsi une prolongation de leur durée de vie tout en offrant conjointement une économie substantielle des frais de maintenance.This weakening of noise pollution is also accompanied by a reduction in the wear of track components (cross member, fasteners, ballast ...) and thus allows an extension of their service life while jointly offering savings. substantial maintenance costs.
Par ailleurs, la semelle de l'invention présente, à faible charge, une plus grande raideur que les semelles traditionnelles, ce qui facilite les opérations initiales de pose et de réglage du rail lors de la réalisation de la voie. Au surplus, cette propriété permet dans le même temps de réduire les contraintes dont la semelle est le siège au repos sous charge, ce qui amoindrit la fatigue de la semelle.Furthermore, the sole of the invention has, at low load, greater stiffness than traditional soles, which facilitates the initial operations of laying and adjusting the rail during the production of the track. In addition, this property allows at the same time to reduce the stresses of which the sole is the seat at rest under load, which reduces the fatigue of the sole.
Ainsi, la semelle présente-t-elle un comportement mécanique quasi uniforme, quelle que soit la charge dans le domaine d'application envisagé (20 à 100KN).Thus, the sole has an almost uniform mechanical behavior, whatever the load in the intended field of application (20 to 100KN).
Enfin la semelle de l'invention est réalisée de façon simple et économique, par exemple, par moulage d'une matière élastomère à base de caoutchouc naturel ou synthétique formulée pour répondre aux exigences des différents cahiers des charges. L'invention sera mieux comprise à la lecture de la description qui va suivre en référence aux dessins et aux tableaux qui suivent dans lesquels :Finally, the sole of the invention is produced in a simple and economical manner, for example, by molding an elastomer material based on natural or synthetic rubber formulated to meet the requirements of the various specifications. The invention will be better understood on reading the description which follows with reference to the drawings and tables which follow in which:
- les figures 1B à 6 représentent des vues de dessus de divers modes de réalisation de la semelle de l'invention ; - la figure 1A représente une vue en coupe transversale du mode de réalisation de la figure 1B ;- Figures 1B to 6 show top views of various embodiments of the sole of the invention; - Figure 1A shows a cross-sectional view of the embodiment of Figure 1B;
- la figure 7 est un graphe représentant les pouvoirs filtrants des modes de réalisation des figures 1B à 6 et ceux de semelles antérieures.- Figure 7 is a graph showing the filtering powers of the embodiments of Figures 1B to 6 and those of anterior soles.
Les figures 8A et 8B sont des graphes comparant des déflexions obtenues sous différentes charges avec les semelles selon l'invention, respectivement vis-à-vis de l'art antérieur et entre elles.FIGS. 8A and 8B are graphs comparing deflections obtained under different loads with the soles according to the invention, respectively with respect to the prior art and with each other.
FEUILLE DE REMPLACEMENT RÈGLE 26 Les figures 9A et 9B représentent les variations de la raideur tangentielle en fonction de la charge en comparant les semelles de l'invention, respectivement vis-à-vis des semelles antérieures et entre elles. La semelle 1 représentée sur les figures IB à 6 est destinée à être montée sur une traverse de chemin de fer en vue de supporter un rail (non représenté). Cette semelle comprend une face supérieure la au contact du patin du rail et une face inférieure lb au contact de la traverse.L'axe médian X de la semelle correspond à la position normale de support du rail.SUBSTITUTE SHEET RULE 26 FIGS. 9A and 9B show the variations of the tangential stiffness as a function of the load by comparing the soles of the invention, respectively with respect to the anterior soles and with each other. The sole 1 shown in Figures IB to 6 is intended to be mounted on a railway sleeper in order to support a rail (not shown). This sole includes an upper face 1a in contact with the rail pad and a lower face 1b in contact with the crosspiece. The central axis X of the sole corresponds to the normal position for supporting the rail.
La semelle comprend au moins une cavité 10 débouchant, de préférence, sur la face inférieure lb en ménageant une zone périphérique 11 d'appui pour le patin de rail, dans les modes de réalisation des figures 1 à 5, la semelle comporte une seule cavité tandis que dans celui de la figure 6, elle comporte six cavités. Les bords latéraux de la semelle 1 sont pourvus d'encoches 12 destinées à interdire ou tout au moins à limiter le cheminement du rail par coopération avec le dispositif d'attache (non représenté).The sole comprises at least one cavity 10, preferably opening onto the underside 1b, providing a peripheral zone 11 for the support of the rail shoe, in the embodiments of FIGS. 1 to 5, the sole comprises a single cavity while in that of Figure 6, it has six cavities. The lateral edges of the sole 1 are provided with notches 12 intended to prevent or at least limit the path of the rail by cooperation with the fastening device (not shown).
Quel que soit le mode de réalisation envisagé, pour l'invention, la zone d'appui 11 est toujours plane et sa surface est comprise entre une et dix fois la surface de la paroi latérale interne 10a de la cavité 10. Le coefficient dit de forme, correspondant au rapport de ces deux surfaces, est donné dans le tableau ci-après.Whatever the embodiment envisaged, for the invention, the support zone 11 is always flat and its surface is between one and ten times the surface of the internal side wall 10a of the cavity 10. The coefficient known as shape, corresponding to the ratio of these two surfaces, is given in the table below.
Cette géométrie spécifique permet d'obtenir un pouvoir de filtration des vibrations supérieur ou égal à 0,45 pour des valeurs extrêmes de charge statique de 20 et 100KN et de surcharge dynamique de 20 et 80KN.This specific geometry makes it possible to obtain a vibration filtration power greater than or equal to 0.45 for extreme values of static load of 20 and 100KN and dynamic overload of 20 and 80KN.
Le pouvoir de filtration est défini comme étant le rapport des raideurs sécantes correspondant respectivement aux charges statiques et surcharges dynamiques considérées. Les valeurs obtenues, selon l'invention pour ce pouvoir, sont données dans le tableau ci-après.The filtration power is defined as being the ratio of the secant stiffnesses corresponding respectively to the static loads and dynamic overloads considered. The values obtained, according to the invention for this power, are given in the table below.
La semelle est réalisée avec un matériau élastomère dont le module d'élasticité est sensiblement stable sur une plage de température comprise entre 0°c et 40°C. La cavité est ici unique et centrée sur la semelle 1, mais de manière plus générale, cette cavité est positionnée de telle sorte que leThe sole is made of an elastomeric material whose elasticity modulus is substantially stable over a temperature range between 0 ° c and 40 ° C. The cavity is here unique and centered on the sole 1, but more generally, this cavity is positioned so that the
FEUILLE DE REMPLACEMENT RÈGLE 26 minimum de raideur soit obtenu sur l'axe médian X.SUBSTITUTE SHEET RULE 26 minimum stiffness is obtained on the median axis X.
La cavité 10 est cylindrique et sa paroi latérale interne a des génératrices parallèles à la normale à la face supérieure la tandis que sa profondeur représente au moins 80% de l'épaisseur totale de la semelle 1 comme représenté sur la figure 1A où subsiste un voile 13 de matière formant le fond 10b. Le cas échéant, ce voile 13 peut s'étendre de façon intercalaire dans la cavité 10, entre le niveau des faces supérieure et inférieure. Le fond 10b obture, vers le haut, la cavité 10 en interdisant ainsi toute pénétration d'eau ou de particules étrangères, et en assurant, en outre, une bonne isolation électrique de ladite cavité de façon à éviter l'apparition d'arc électrique à l'intérieur de cette dernière.The cavity 10 is cylindrical and its internal lateral wall has generatrices parallel to the normal to the upper face 1a while its depth represents at least 80% of the total thickness of the sole 1 as shown in FIG. 1A where a veil remains 13 of material forming the bottom 10b. If necessary, this veil 13 can extend in an intermediate manner in the cavity 10, between the level of the upper and lower faces. The bottom 10b closes, upwards, the cavity 10, thus preventing any penetration of water or foreign particles, and ensuring, in addition, good electrical insulation of said cavity so as to avoid the appearance of an electric arc. inside the latter.
L'épaisseur de la semelle est généralement comprise entre 4 mm et 12 mm, en fonction des applications envisagées. Les modes de réalisation exemplifiés ici et présentés sur le tableau et les graphes correspondent à des épaisseurs respectives de 7 mm et 9 mm.The thickness of the sole is generally between 4 mm and 12 mm, depending on the applications envisaged. The embodiments exemplified here and presented in the table and the graphs correspond to respective thicknesses of 7 mm and 9 mm.
Sur les figures IB, 2 et 3, la cavité 10 a un axe de révolution et possède une paroi latérale interne 10a dont le profil est curviligne.In FIGS. 1B, 2 and 3, the cavity 10 has an axis of revolution and has an internal side wall 10a whose profile is curvilinear.
Sur la figure IB, le pourtour de la cavité 10 est ovale tandis que sur les figures 2 et 3, ce pourtour est circulaire. Sur les figures 4 et 5, la cavité 10 a un contour polygonal respectivement en losange et en carré.In FIG. 1B, the periphery of the cavity 10 is oval while in FIGS. 2 and 3, this periphery is circular. In Figures 4 and 5, the cavity 10 has a polygonal contour in rhombus and square respectively.
Sur la figure 6, les cavités ont un bord périphérique circulaire. Le tableau ci-après donne, d'une part, pour différents modes de réalisation de semelle selon l'invention, et d'autre part, pour d'autres semelles antérieures, les valeurs correspondantes des coefficients de forme et celles des pouvoirs filtrants.In Figure 6, the cavities have a circular peripheral edge. The table below gives, on the one hand, for different embodiments of the sole according to the invention, and on the other hand, for other previous soles, the corresponding values of the form coefficients and those of the filtering powers.
Le graphe de la figure 7 représente les valeurs du pouvoir filtrant en fonction de la raideur statique sécante pour différents modes de réalisation de la semelle de l'invention (encadrement pointillés) et pour les semelles antérieures.The graph in FIG. 7 represents the values of the filtering power as a function of the secant static stiffness for different embodiments of the sole of the invention (dotted frame) and for the anterior soles.
Les graphes des figures 8A et 8B représentent les variations de déflexion en fonction de la charge appliquée pour différents modes de réalisation de l'invention comparés à des semelles antérieures.The graphs in FIGS. 8A and 8B represent the variations in deflection as a function of the load applied for different embodiments of the invention compared to anterior flanges.
Les graphes des figures 9A et 9B représentent les variations de la raideur tangentielle comparées entre les différents modes de réalisation de l'invention et des semelles antérieures.The graphs of FIGS. 9A and 9B represent the variations of the tangential stiffness compared between the different embodiments of the invention and of the anterior soles.
FE I FE I

Claims

R E V E N D I CAT I O N S REVENDI CAT IONS
1. Semelle en élastomère pour le support d'un rail de chemin de fer sur une traverse, du type comprenant des faces supérieure (la) et inférieure (lb) et au moins une cavité (10a) ménageant une zone périphérique d'appui (11) pour le patin de rail, caractérisée en ce que la zone périphérique d'appui est plane et sa surface est comprise entre une et dix fois la surface de la paroi latérale interne (10a) de ladite cavité (10), de façon à ce que le rapport des raideurs sécantes prises respectivement entre des valeurs de charge statique de 20 et 100KN et des valeurs de surcharge dynamique de 20 et1. Elastomer sole for the support of a railroad rail on a sleeper, of the type comprising upper (la) and lower (lb) faces and at least one cavity (10a) providing a peripheral support zone ( 11) for the rail shoe, characterized in that the peripheral support zone is flat and its surface is between one and ten times the surface of the internal lateral wall (10a) of said cavity (10), so as to what the ratio of the secant stiffnesses taken respectively between static load values of 20 and 100KN and dynamic overload values of 20 and
80 KN, soit supérieur ou égal à 0,45.80 KN, which is greater than or equal to 0.45.
2. Semelle selon la revendication 1, caractérisée en ce que ladite cavité (10) est localisée de telle sorte que le minimum de raideur soit situé sur l'axe médian (X) de la face supérieure (la).2. Sole according to claim 1, characterized in that said cavity (10) is located so that the minimum stiffness is located on the median axis (X) of the upper face (la).
3. Semelle selon la revendication 1 ou 2, caractérisée en ce que la paroi (10a) de ladite cavité (10) a des génératrices parallèles à la normale à la face supérieure (la).3. Sole according to claim 1 or 2, characterized in that the wall (10a) of said cavity (10) has generatrices parallel to the normal to the upper face (la).
4. Semelle selon l'une des revendications 1 à 3, caractérisée en ce que ladite cavité (10) est cylindrique et débouche sur la face inférieure (lb).4. Sole according to one of claims 1 to 3, characterized in that said cavity (10) is cylindrical and opens onto the underside (lb).
5. Semelle selon l'une des revendications précédentes, caractérisée en ce que ladite cavité (10) a un axe de révolution et possède une paroi latérale interne (10a) à pourtour curviligne. 5. Sole according to one of the preceding claims, characterized in that said cavity (10) has an axis of revolution and has an internal side wall (10a) with curvilinear periphery.
6. Semelle selon la revendication 5, caractérisée en ce que le pourtour de ladite cavité (10) est ovale.6. Sole according to claim 5, characterized in that the periphery of said cavity (10) is oval.
7. Semelle selon l'une des revendications 1 à 4, caractérisée en ce que ladite cavité (10) a un contour polygonal.7. Sole according to one of claims 1 to 4, characterized in that said cavity (10) has a polygonal contour.
8. Semelle selon l'une des revendications précédentes, caractérisée en ce qu'elle est réalisée avec un matériau élastomère dont le module d'élasticité est sensiblement stable sur une plage de température comprise entre 0°C et 40°C.8. Sole according to one of the preceding claims, characterized in that it is made with an elastomeric material whose elastic modulus is substantially stable over a temperature range between 0 ° C and 40 ° C.
9. Semelle selon l'une des revendications précédentes, caractérisée en ce que la profondeur de ladite cavité (10) représente au moins 80% de l'épaisseur totale.9. Sole according to one of the preceding claims, characterized in that the depth of said cavity (10) represents at least 80% of the total thickness.
10. Semelle selon l'une des revendications précédentes, caractérisée en ce que ladite cavité (10) est unique et centrée.10. Sole according to one of the preceding claims, characterized in that said cavity (10) is unique and centered.
11. Semelle selon l'une des revendications 1 à 9, caractérisée en ce qu'elle comporte six cavités.11. Sole according to one of claims 1 to 9, characterized in that it comprises six cavities.
12. Semelle selon l'une des revendications précédentes, caractérisée en ce que son épaisseur est comprise entre 4 et 12 mm, et de préférence, entre 7 et 9 mm. 12. Sole according to one of the preceding claims, characterized in that its thickness is between 4 and 12 mm, and preferably between 7 and 9 mm.
EP00931309A 1999-05-20 2000-05-18 Elastomer tie pad for the support of a railway rail on a sleeper Expired - Lifetime EP1180174B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9906391 1999-05-20
FR9906391A FR2793818B1 (en) 1999-05-20 1999-05-20 ELASTOMER SOLE FOR SUPPORTING A RAILWAY RAIL ON A CROSSING
PCT/FR2000/001344 WO2000071815A1 (en) 1999-05-20 2000-05-18 Elastomer tie pad for the support of a railway rail on a sleeper

Publications (2)

Publication Number Publication Date
EP1180174A1 true EP1180174A1 (en) 2002-02-20
EP1180174B1 EP1180174B1 (en) 2004-11-24

Family

ID=9545794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00931309A Expired - Lifetime EP1180174B1 (en) 1999-05-20 2000-05-18 Elastomer tie pad for the support of a railway rail on a sleeper

Country Status (6)

Country Link
EP (1) EP1180174B1 (en)
AT (1) ATE283392T1 (en)
AU (1) AU4928900A (en)
DE (1) DE60016199T2 (en)
FR (1) FR2793818B1 (en)
WO (1) WO2000071815A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2500660A (en) * 2012-03-28 2013-10-02 Tiflex Ltd Rail pad
CA2920961A1 (en) * 2013-09-13 2015-03-19 Schwihag Ag Rail-mounting assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2574439B1 (en) * 1984-12-06 1987-01-30 Ressorts Ind ANTIVIBRATILE SOLE FOR THE SUSPENSION OF A RAILWAY RAIL AND BALLAST-FREE TRACK SLIP COMPRISING SUCH A SOLE
FR2630466B1 (en) 1988-04-22 1991-06-14 Spencer Moulton Ste Fse ELASTOMER BASED CUSHIONING SOLE FOR RAILWAYS
DE4314578A1 (en) * 1993-04-28 1994-11-03 Udo Wirthwein Elastic rail pad
AT404607B (en) * 1993-06-30 1999-01-25 Porr Allg Bauges Track construction with rails

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0071815A1 *

Also Published As

Publication number Publication date
AU4928900A (en) 2000-12-12
EP1180174B1 (en) 2004-11-24
ATE283392T1 (en) 2004-12-15
WO2000071815A1 (en) 2000-11-30
DE60016199D1 (en) 2004-12-30
FR2793818A1 (en) 2000-11-24
DE60016199T2 (en) 2005-12-01
FR2793818B1 (en) 2001-08-10

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