Vibration reduction fastener with rail brace for urban rail transit curve section

Abstract

The invention relates to the technical field of rail transit engineering, and discloses a damping fastener with a rail brace for a curve section of urban rail transit, which is arranged on a sleeper of the curve section and comprises a damping component arranged on the sleeper, and a macromolecular heightening base plate for preventing hard contact between the damping component and the sleeper is arranged on the outer side part between the damping component and the sleeper. The vibration reduction assembly is provided with a curved steel rail, the bottom of the inner side of the curved steel rail is provided with a buckling assembly, the outer side of the curved steel rail is fixedly provided with a rail brace, and the outer side of the curved steel rail sequentially penetrates through the rail brace, the vibration reduction assembly and a macromolecule heightening base plate through foundation bolts and then is fixed to the upper portion of a sleeper. An arc-shaped protrusion matched with the rail brace is arranged on the side, close to the rail brace, of the upper surface of the upper-layer iron base plate. The rail brace is fixed to the outer side of the curved steel rail through the fixing device and tightly attached to the lower jaw, the rail web and the rail bottom area on the outer side of the curved steel rail, and the outward inclination resistance of the steel rail can be effectively improved when a train passes through a small-radius curve.

Description

Technical Field

[0001] The invention relates to the technical field of rail transit engineering, and more particularly to a vibration-damping fastener with a rail support used in curved sections of urban rail transit. Background Art

[0002] In order to offset the centrifugal force generated by vehicles when turning, urban rail transit will set the outer rail superelevation in curved sections. The purpose of this design is to allow the vehicle to naturally tilt inward, thereby balancing the centrifugal force and ensuring safe and smooth driving. However, on small radius curves, since a larger outer rail superelevation is required to effectively cope with the strong centrifugal force, if the train speed is too fast or too slow, the design of the outer rail superelevation may not be able to accurately match the actual required centripetal force compensation value, resulting in an increase in the imbalance of centrifugal force and centripetal force in some sections. This imbalance will cause the lateral force on the rail to be unevenly distributed, and increase the dynamic bending stress and displacement of the rail in the lateral direction. In the long run, this will not only reduce the lateral stability of the track structure, but may also weaken its overall strength, thereby affecting the safety of the track.

[0003] On the other hand, the wheel-rail contact in curved sections is complex, often accompanied by vibration and noise. In reality, vibration reduction and noise reduction are often achieved by installing vibration reduction fasteners. Since the overall stiffness of vibration reduction fasteners is significantly lower than that of ordinary fasteners, when the train passes through the curved section, the rails are prone to camber, resulting in corrugation and other phenomena in the curved section, which affects the service life of the rails.

[0004] Therefore, how to improve the safety of using vibration-damping fasteners in curved sections of urban rail transit and extend the service life of rail equipment has become a technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] In view of this, the present invention provides a vibration-damping fastener with a rail support for use in curved sections of urban rail transit. The fastener is fixed to the rail support on the outside of the curved rail through a fixing device, and fits tightly with the lower jaw, rail waist and rail bottom area on the outside of the curved rail. It can effectively improve the ability of the rail to resist inclination when the train passes through a small radius curve.

[0006] To achieve the above-mentioned purpose, the present invention provides a vibration-damping fastener with rail support for use in curved sections of urban rail transit, which is arranged on the sleeper in the curved section and includes a vibration-damping assembly arranged on the sleeper, a polymer height-adjusting pad for preventing hard contact between the two being arranged between the vibration-damping assembly and the sleeper, a curved rail being arranged on the vibration-damping assembly, a buckling assembly being arranged on the inner bottom of the curved rail, a rail support being fixedly arranged on the outer side of the curved rail, the rail support being tightly fitted to the lower jaw, rail waist and rail bottom area of ​​the outer side of the curved rail, the outer side of the curved rail being fixed above the sleeper after passing through the rail support, the vibration-damping assembly and the polymer height-adjusting pad in sequence by anchor bolts, and an arc-shaped protrusion matching the rail support is arranged on the side of the upper surface of the upper iron pad close to the rail support, so as to provide inward lateral supporting force for the rail support.

[0007] Preferably, the vibration reduction assembly includes an upper iron pad, a lower iron pad and a middle rubber pad arranged between the two plate surfaces.

[0008] Preferably, a spring bar for buffering is provided between the rail support and the nut of the anchor bolt.

[0009] Preferably, a rail pad is provided between the curved rail and the vibration reduction assembly.

[0010] Preferably, a safety limit device is provided in the screw hole of the anchor bolt.

[0011] Preferably, the buckle assembly includes a buckle cap and a groove, wherein the groove is arranged between the buckle cap and the upper iron pad and close to one side of the curved rail, and the inner bottom of the curved rail abuts against the groove.

[0012] Preferably, the polymer height adjustment pad is made of rubber or polyurethane material.

[0013] It can be known from the above technical scheme that, compared with the prior art, the vibration-damping fastener with rail support provided by the present invention provides a restraining force to the outer side of the curved rail through the rail support, and provides a restraining force to the inner side of the curved rail through the fastening assembly. The vibration-damping assembly can enable the vehicle to maintain a good track geometry even under complex and changeable track conditions, thereby improving driving safety. The rail support is fixed to the outer side of the curved rail through a fixing device, and fits tightly with the lower jaw, rail waist and rail bottom area on the outer side of the curved rail, thereby effectively improving the ability of the curved rail to resist inclination when the train passes through a small radius curve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0015] Figure 1 It is a front cross-sectional view of the vibration-damping fastener with rail support used in curved sections of urban rail transit according to the present invention.

[0016] In the figure, vibration reduction assembly-1, upper iron pad-11, middle rubber pad-12, lower iron pad-13, fastening assembly-14, arc-shaped protrusion-15, curved rail-2, rail support-3, anchor bolt-4, safety limit device-41, spring bar-5, polymer height adjustment pad-6, sleeper-7, rail underpad-21. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Please see attached Figure 1 , which is a vibration-damping fastener with rail support for use in curved sections of urban rail transit disclosed by the present invention.

[0019] The vibration-damping fastener with rail support for curved sections of urban rail transit provided by the present invention is arranged on the sleeper 7 of the curved section, and includes elastic bars 5, curved rails 2, rail pads 21, vibration-damping components 1, polymer height-adjusting pads 6, rail supports 3, anchor bolts 4, safety limit devices 41, etc.

[0020] The rail support 3 is fixed to the outer side of the curved rail 2 by a fixing device, and is closely fitted with the lower jaw, rail waist and rail bottom area of ​​the outer side of the curved rail 2, effectively improving the ability of the rail to resist outward inclination when the train passes through a small radius curve. The preferred rail support 3 is an L-shaped structure.

[0021] The vibration reduction assembly 1 comprises an upper iron pad 11, a middle rubber pad 12, and a lower iron pad 13. Preferably, the vibration reduction assembly 1 has a height of 55-60 mm.

[0022] The upper iron pad 11, the lower iron pad 13 and the middle rubber pad 12 are integrated into one by vulcanization process, which ensures a firm connection between the iron pad and the rubber pad, and can maintain a good track geometry even under complex and changeable track conditions, thereby improving driving safety.

[0023] The upper and lower iron plates 11, 13 are made of cast iron, and their length is preferably 350-360 mm, and their width is preferably 205-215 mm.

[0024] A polymer height-adjusting pad 6 is placed between the lower iron pad 13 and the sleeper 7, which can not only adjust the height of the vibration damping assembly 1 and prevent hard contact between the lower iron pad 13 and the sleeper 7, but also prevent the stray current on the track from causing electrical corrosion to the sleeper 7 structure. Multiple layers of polymer height-adjusting pads 6 can be placed near the outer side to adjust the height difference between the inner and outer sides of the curved rail 2; preferably, the polymer height-adjusting pad 6 has a thickness of 1-2 mm.

[0025] On the inner side of the curved rail 2, the vibration reduction assembly 1 is first fixed to the sleeper 7 by the anchor bolt 4, and then the curved rail 2 is fixed to the vibration reduction assembly 1 by the buckle assembly 14, so that the inner end of the curved rail 2 is relatively fixed to the sleeper 7. On the outer side of the curved rail 2, the anchor bolt 4 passes through the spring bar 5, the rail support 3, the upper iron pad 11, the middle rubber pad 12, the lower iron pad 13, and the polymer height adjustment pad 6 in sequence, so as to fix the curved rail 2 above the sleeper 7. The outer side of the curved rail 2 is provided with restraint force by the rail support 3, and the inner side is provided with restraint force by the buckle assembly 14.

[0026] A rail pad 21 is provided between the curved rail 2 and the vibration reduction assembly 1 . The rail pad 21 is made of a polymer material and is provided at both the inner and outer sides below the curved rail 2 .

[0027] It should be noted that the polymer height adjustment pad 6 is made of polymer materials, including: resins such as resin coating, resin fiberglass, polyurethane waterproof coating, etc.; asphalts such as asphalt glass cloth and polymer modified asphalt roll; rubbers such as natural rubber and butyl rubber; polymer waterproof rolls such as EPDM waterproof rolls and polyethylene polypropylene polymer waterproof rolls; metals; asbestos boards, etc.

[0028] Hard contact is adopted between the rail support 3 and the upper iron pad 11, and between the rail support 3 and the curved rail 2.

[0029] The upper iron pad 11 is provided with an arc-shaped protrusion 15 matching the ground of the rail support 3, providing lateral force support when the train passes, and ensuring the stability of the rail at the curve.

[0030] A safety limit device 41 is arranged in the screw hole of the anchor bolt 4. The safety limit device 41 can penetrate the upper iron pad 11, the lower iron pad 13 and the middle rubber pad 12, or can only penetrate the upper iron pad 11 and the middle rubber pad 12 to prevent the bolt from having insufficient torque resulting in insufficient buckling pressure or excessive torque, resulting in excessive deformation of the rubber pad.

[0031] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vibration-damping fastener with rail support for use in curved sections of urban rail transit, arranged on a rail sleeper (7) in the curved section, characterized in that: The invention comprises a vibration reduction component (1) arranged on a rail sleeper (7), a polymer height adjustment pad (6) for preventing hard contact between the vibration reduction component (1) and the rail sleeper (7), a curved steel rail (2) being arranged on the vibration reduction component (1), a buckling component (14) being arranged at the inner bottom of the curved steel rail (2), a rail support (3) being fixedly arranged at the outer side of the curved steel rail (2), the rail support (3) being tightly fitted with the lower jaw, the rail waist and the rail bottom area of ​​the outer side of the curved steel rail (2), the outer side of the curved steel rail (2) being fixed above the rail sleeper (7) by means of anchor bolts (4) passing through the rail support (3), the vibration reduction component (1) and the polymer height adjustment pad (6) in sequence, and a circular arc-shaped protrusion (15) matching the rail support (3) is arranged on the upper surface of the upper iron pad (11) near the rail support (3) to provide an inward lateral support force for the rail support (3).

2. The vibration-damping fastener with rail support for use in curved sections of urban rail transit according to claim 1, characterized in that: The vibration reduction assembly (1) comprises an upper iron pad (11), a lower iron pad (13), and a middle rubber pad (12) arranged between the two plate surfaces.

3. The vibration-damping fastener with rail support for use in curved sections of urban rail transit according to claim 1, characterized in that: A spring bar (5) for buffering is provided between the rail support (3) and the nut of the anchor bolt (4).

4. The vibration-damping fastener with rail support for use in curved sections of urban rail transit according to claim 1, characterized in that: A rail underlay plate (21) is provided between the curved steel rail (2) and the vibration reduction assembly (1).

5. The vibration-damping fastener with rail support for use in curved sections of urban rail transit according to claim 1, characterized in that: A safety limit device (41) is provided in the screw connection hole of the anchor bolt (4).

6. The vibration-damping fastener with rail support for use in curved sections of urban rail transit according to claim 1, characterized in that: The buckle assembly comprises a buckle cap and a groove, wherein the groove is arranged between the buckle cap and the upper iron pad (11) and close to one side of the curved rail, and the inner bottom of the curved rail abuts against the groove.

7. The vibration-damping fastener with rail support for use in curved sections of urban rail transit according to claim 1, characterized in that: The polymer height-adjusting pad (6) is made of rubber or polyurethane material.

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