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
  • E01B9/62—Rail fastenings incorporating resilient supports
• • 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
• • 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

Definitions

• Means for transmission of force between the rail of a railbound vehicle and the ground Means for transmission of force between the rail of a railbound vehicle and the ground.
• the present invention refers to a device for force transfer between a rail for a trackbound vehicle and foundation.
• rails are located and fixed: A) Directly on wood, steel or concrete sleepers, possibly with spacers (pads) and with simple guide devices (counter- sinkings in the sleeper itself). B) On load distribution plates (tieplates) most frequently of steel in order to distribute the pressure against a softer (resilient) material for example wood. In the case where the sleeper or the foundation is stiff and extra spring action is needed the plate is carried out according to B above, resilient in itself (in principle two steel plates being vulcanized together) .
• EP-A2-0236 703 discloses a rail mounting which includes two support parts separated from each other that at hard load cases function to cooperate with each other merely in series, that is, that initially a first support part supports the rail at normal load and that at larger load a second support part, which is located just below the first support part and which acts together with the first support part of the load support, supports the rail. This gives among other things a nonsatisfactory vibration damping and that the load can not be limited what refers to a certain support part.
• the main object of the present invention is therefore at first hand to achieve a device of the type stated above which among other things solves the above said problem and which enables safer dimensioning of the contained parts.
• Said purpose is achieved by means of a device according to the present invention which in the main is characterized therein, that the device is provided in such a way that at a certain predetermined elastic stroke a direct force transfer will simultaneously occur from the foot of the nst n l a bearing part which is applied on the foundation or which constitutes part of this foundation, and via a movable part, and that before this elastic stroke is made use of the force transfer occurs merely via the movable part via resilient elements to the bearing part, whereby the load on the movable part in a definite way is limited no matter which dynamic stresses the rail may receive from a trackbound vehicle wheel, and that the parts are stiff with a stiffness corresponding to metallic material.
• the invention is described in the following such as a number of preferred embodiments, whereby is referred to the enclosed drawings in which the main concept of the invention is that a device for force transfer between the rail of a trackbound vehicle and a foundation is constituted such that at a certain predetermined elastic stroke a direct force transfer will occur from the foot of the rail against a surface which in turn is laid up on a bearing part, which can be applied on the foundation or be part of this foundation.
• the force transfer occurs merely via a movable part via resilient elements to the bearing part according to the above.
• the load on the movable part thereby can be limited in a satisfactory way regardless of any dynamic stresses that the rail may receive from the trackbound wheel.
• the rail and the movable part are slavishly interconnected what considers vertical and radial movements as well as rotational ditto. Longitudinal movements (rail floating) are allowed in a desired degree and are damped to a desired degree through squeezing force and friction between clips and rail and partly thereby related friction between rail and the movable part. Between the rail and the movable part a pressure and equalizing membrane is arranged, which has no other than marginal resiliency but a certain insulating capacity.
• a bearing surface is made from an elastomer or the like with high stiffnes (rubber material 70° Shore or the like) .
• the elastic stroke before the bearing surface absorbes the load is selected so that the required softness of the material of an elastic support cushion etc. can be chosen.
• the material of the elastic support cushion gives insulation and damping at loads falling below the static maximal.
• the elastic support cushion constitutes the resilient element that in cooperation with elastic elements transfers forces between the parts, before the bearing part takes load.
• the elements can be vulcanized between the parts. Lift and rotational movements between the parts can be limited by means of clips, which may be resilient or limited resilient.
• the elements can for example be completely replaced by loose resilient elastomeric elements in combination with clips according to above.
• the bearing part can be provided with a pressure equalizing membrane against the surface of the foundation top.
• the bearing part can be integrated with the foundation, for example casted together.
• it can be united with the foundation for example a concrete sleeper.
• the bearing surface may take up vertical as well as horizontal forces to a necessary extent, thus for example, the elements may be so soft that a merely partial horizontal force transfer occurs via these but instead insulation is prioritized in these.
• Fig 1 shows a schematic top view of a rail mounting according to the present invention wherein the rail is installed on the mounting
• Fig 2 also shows a schematic top view of a rail mounting according to the present invention before the rail is mounted.
• Fig 3 shows a sectional view along the line III-III drawn in Fig 1, a first illustrated load case
• Fig 4 shows a cross-sectional view along the line IV-IV drawn in Fig 2, a first load case
• Fig 5 shows a cross-sectional view along the line V-V drawn in Fig 1,
• Fig 6 shows a cross-sectional view along the line VI-VI drawn in Fig 1,
• Fig 7 shows an additional example of the invention with a sleeper shown from above and thereby integrated support parts
• Fig 8 shows cross-sectional views along the lines VIIIA-VIIIA and VIIIB-VIIIB respectively drawn in Fig 7 and 9 respectively,
• Fig 9 shows a top view of said sleeper and its integrated rail mounting with supported rail.
• Fig 10 shows a divided sectional view along the line X-X drawn in Fig 9 and 7,
• Fig 11 shows a schematic perspective view of the present invention
• Fig 12 shows a cross-sectional view along the line XII-XII in Fig 11.
• a device 1 according to the present invention intended for force transfer between a rail 2 for a trackbound vehicle and a foundation 3, can for example be used for a rail 2 of traditional type, including a lower rail foot 2A and an upper race part 2B. and which is supported by a number of sleepers extending across the intended race direction 4 of the rail or by some other appropriate ground anchored foundation 3, such as for example a concrete floor a metal plate etc.
• the device 1 is constituted in such a way that at a certain predetermined elastic stroke f. a direct force transfer F will occur from the foot of the rail against a surface 5, which in its turn is laid upon a bearing part 6 which is placed on the foundation 3 or which constitutes a part of this foundation 3.
• a direct force transfer F will occur from the foot of the rail against a surface 5, which in its turn is laid upon a bearing part 6 which is placed on the foundation 3 or which constitutes a part of this foundation 3.
• this elastic stroke f r is made use of the force transfer is provided to merely occur via a movable part 7, which in its turn is supported via a number of resilient elements 8,9,10 by the bearing part 6.
• the load between 6 and 7 is thereby limited in a satisfactory manner independently of which dynamic stresses the rail 2 might obtain from the wheels of trackbound vehicles.
• Said movable force transfer part 7 and bearing part 6 are restrictedly laterally displaceable in planes relatively each other and are located at separate height levels 11,12 referring to top and bottom surfaces respectively in relation to each other telescopically.
• said movable force transfer part 7 and the bearing part 6 and intermediate resilient elements 8,9,10 form a common support body 13.
• the parts 6 and 7 may consist of an appropriate metal like stiff material, for instance cast metal, and may include means 14 to be able to be firmly anchored to for instance a sleeper 3 etc.
• the assembled said parts 6,7 of this support body 13 are arranged movable relatively each other, that is, that the movable force transfer part 7 is restrictedly movable as well in vertical 15 as in horizontal direction 16 as regarding rotational movements.
• said movable force transfer part 7 is received movable inside a cavity space 17 formed next to the bearing surface 5 of the bearing part 6, and elastic elements 9,10 are received to act between said parts 6,7.
• a rail foot 2A is clampable to said movable force transfer part 7, slavishly intercoupled with respect to vertical, radial and rotational movements.
• Clamping may for instance by carried out by means of so called clips 23 and with pressure and equalizing membranes 21 located in- between, for instance a hard rubber or plastic mat on the intended movable force transfer part 7, provided thereon for instance in preferably a countersunk support surface 22.
• Said membrane 21 has only marginal resiliency and the effect thereof at first hand is to function as an equalizing bedding for the foot 2A of the rail, but also to a certain degree function with insulating ability what refers to sound distribution as well in the air as via structures.
• the elastic stroke fi before the bearing part 6 absorbs the load is achieved by necessary softness being selected for said elastic bedding elements 8,9,10.
• the bearing part 6 exhibits elastic surface elements 5 which are formed of elastomers or the like, which have higher stiffnes than that of said elastic elements 8,9,10, for example rubber material 70° Shore.
• the bearing part 6 can be divided with the parts laterally displaced from each other with a certain distance and several mountings according to the invention can be arranged along the length extension of respective rail at suitable mutual distances along the rail 2.
• said spring elements 8,9,10 can consist of elastomeric bodies, for instance of rubber material or other appropriate material which has the ability of certain mobility both horizontally and vertically.
• the resiliency of said elastic spring element 8,9,10 determines. the elastic stroke f, and thereby associated force transfer from the movable support part 7 to the part 6 before it is completely utilized, necessary remaining support function occurs via the bearing part 6.
• Said spring element 9,10 thanks to its material also gives damping but the main object is to achieve isolation at loads F falling below the static maximal. Horizontal force transfer occurs via elements 9,10 despite their softness and simultaneously a certain horizontal force transfer via the bedding element 8 occurs.
• the elastic spring elements 9,10 which transfer the force between the parts 5,6 are constituted by elastomers or similar material such as for example rubber
• Said fixed bearing part 6 such as is shown in Fig 7-10 can preferably be integrated with a foundation, such as for example a concrete sleeper 3, whereby preferably common parts in pairs laterally displaced at an intended distance L from each other can be supported by one and the same sleeper 3 in order to support thereon a rail 2 each.
• the solid parts 6 are laid out on a predetermined mutual distance (cc) along the rail 2 so that the load carrying capacity (bending stiffness) of the rail is made use of in a manner that may be endured by the rail 2 and which is required by the construction.
• a pressure equalizing membrane can be received between the top surface of the rack 3 and the bearing part 6 but at an integrated bearing part, for example a concrete sleeper 3, this pressure equalizing part is omitted.
• transverse of the rail extending support surfaces in pairs constitute said bearing part 6 longi ⁇ tudinally distributed along the running direction of a rail, and which is provided to receive the foot part 2A of a rail 2 supported thereon at the supporting occasion II making use of said bearing part 6.
• the force transfer parts 6,7 are dimensioned and constituted such, that at a predetermined elastic stroke of the movable part 7 the distance i ⁇ the remaining part of the load F is transferred vertically displaced from the movable bearing part 7 directly from the rail foot 2A to the force bearing part 6. Top surfaces of 5 and 7 are thereby in level with each other and follow the rail foot 2A.
• the elastic stroke f_ of the part 7 relatively the elastic stroke f detox of the part 6 is determined among other things by characteristics of the resilient elements 9,10 having certain damping ability at loads falling below the static maximal.
• Lift and rotational movements between the parts can be limited by means of resilient or restrictedly resilient clips 23 or the like. Possibly the elastic elastomer elements 9,10 should wholly or partly be able to be replaced by loose resilient elements in combination with for instance earlier mentioned clips 23.
• the parts 6,7 are dimensioned and constituted such that at a predetermined elastic stroke of the movable bearing part 7 the remaining load (F) from the rail foot 2A is transferred to the bearing part 6 vertically displaced from the movable bearing part 7, such that in this phase consequently a parallel force transfer occurs partly via the movable force transfer part 7 and the bearing part 6 and partly from the rail 2 to the bearing part 6.
• the movable part (corresponding to the bearing part 7), which today is dimensioned to carry a maximum load, can be made considerably safer and even thinner(less expensive)than of today. It can be sized down to carry a limited part of the maximum load, perhaps maximum 1/4 of the maximum sleeper load (of today). When the load thus exceeds 1/4 the load is transferred to the bearing part 6, partly directly from the rail foot and simultaneously the remaining part via the movable part 7, and which still is dimensioned to carry the whole load.
• the whole construction can thereby be made lighter in weight and less expensive than those of today and be better adapted to the requirements of: vibration damping, force transfer and rail fixation etc.
• the invention includes a device for force transfer between a rail for a trackbound vehicle and a foundation in such a way that at a certain predetermined elastic stroke, a direct force transfer will occur from the foot of the rail towards a surface which in its turn is laid up on a fixed part 6, which may be laid up on the foundation 3 or be an integrated part of this foundation 3.
• the force transfer is carried out by means of a movable part 7 via resilient elements 8 to the same part 6, according to the above.
• the load on the movable part 7 thereby in a satisfactory way can be limited no matter which dynamic stresses the rail might receive from the trackbound wheel.
• the invention is not limited to the embodiments described above and shown in the drawings, but can be varied within the scope of the patent claims without departing from the inventive concept.
• the movable force transfer parts may be located to surround a bearing part situated inside these, thus contrary to what has been described above, or that a number of bearing parts and movable force transfer parts respectively may for instance be present in rows.
• the main concept of the invention is consequently according to the above and that the rail foot 2A is provided with a movable part 7 which moreover locally broadens the foot 2A of the rail at the solid bearing part 6.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Bearings For Parts Moving Linearly (AREA)
• Vehicle Body Suspensions (AREA)
• Railway Tracks (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20390874

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (6)

• 1993
  • 1993-08-25 SE SE9302738A patent/SE9302738L/sv not_active Application Discontinuation
• 1994
  • 1994-08-25 WO PCT/SE1994/000772 patent/WO1995006165A1/en active Application Filing
  • 1994-08-25 AU AU75490/94A patent/AU7549094A/en not_active Abandoned

Patent Citations (6)

Also Published As

Similar Documents

Legal Events