A vibration damping system for continuously supported rails with particle damping

Abstract

The application discloses a continuous support rail damping system with particle damping, which realizes a steel rail continuous support solution and can continuously provide vertical, longitudinal and transverse support stiffness of the steel rail; through the configuration of particle damping, the problems such as steel rail Pinned-Pinned resonance, large wheel-rail noise radiation and steel rail self vibration in the prior art are solved; the system continuously provides lateral limiting for the steel rail, relieves the stress concentration problems of the fastener and the steel rail, greatly improves the problems such as large fastener structure maintenance amount, and the like; the continuous support guarantees the continuity of the transverse stiffness of the fastener system, improves and enhances the transverse stability of the steel rail, and thus effectively improves the shortcomings of poor transverse stability of the fastener system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of vibration and noise control of rail transit, and particularly relates to a continuous support rail damping system with particle damping. BACKGROUND

[0002] In the field of rail transit, a fastening system is generally used to fix the spatial relationship between the rail and the sleeper, ensure the geometry of the track, limit the vertical, longitudinal and lateral displacement of the rail, provide support stiffness, and prevent the rail from overturning. The fastening system should be able to effectively maintain the reliable connection between the rail and the sleeper for a long time, and fully exert its buffering and damping performance under the action of power to delay the accumulation of residual deformation of the track. Therefore, it is required to have sufficient strength, durability and elasticity. In the use state, whether there is stress concentration in the rail, and the damping and buffering performance of the fastening system are closely related to maintaining good wheel-rail relationship and smooth operation.

[0003] Most of the existing rail transit fastening systems use discrete point support, lack necessary and continuous support structure along the longitudinal direction of the line, which leads to the following weaknesses: small lateral stiffness of the fastening system, concentrated action point, discontinuous lateral stiffness, large lateral displacement of the rail, poor anti-overturning ability, and poor lateral stability. Due to this discontinuous support structure, the existing rail has the problems of Pinned-Pinned resonance and large wheel-rail noise radiation.

[0004] On the contrary, there is no reasonable continuous support structure in the existing technology. If a continuous support structure is provided on the existing sleeper, excessive vibration will accelerate the damage of the overall system, and the practicability is too low.

[0005] Due to the above reasons, the present inventors, in view of the above engineering problems, based on theoretical research and a large amount of research, have designed a continuous support rail damping system with particle damping, in the hope of realizing the practicality of the continuous support structure through the device. SUMMARY

[0006] In order to overcome the above problems, the present inventors have made intensive research and designed a continuous support rail damping system with particle damping. The system realizes the solution of continuous support of the rail, can continuously provide vertical, longitudinal and lateral support stiffness of the rail, solves the problems of Pinned-Pinned resonance of the rail, large wheel-rail noise radiation and rail self-vibration in the existing technology through the configuration of particle damping, provides lateral limiting for the continuous rail, relieves the stress concentration problem of the fastening and rail, greatly improves the problem of large amount of maintenance of the fastening structure, and guarantees the continuity of the lateral stiffness of the fastening system, improves and enhances the lateral stability of the rail, thereby effectively improving the poor lateral stability of the fastening system, and thus completing the present application.

[0007] Specifically, the present application aims to provide a continuous support rail vibration damping system with particle damping, which comprises a support steel beam 2 arranged below a rail (1), the support steel beam 2 being embeddedly installed on a track slab or a sleeper 3;

[0008] A groove 31 for accommodating the installation of the support steel beam 2 is formed on the upper surface of the track slab or sleeper 3 along the extension direction of the rail;

[0009] The support steel beam 2 comprises a top plate 21, a bottom plate 22 and two side plates 23 which are integrally fixed;

[0010] The top plate 21, the bottom plate 22 and the two side plates 23 jointly form a cavity 4,

[0011] The cavity is filled with damping particles 6 selected from one or more of iron sand, lead particles, steel balls and sand;

[0012] The vibration energy is consumed through the collision and friction between the damping particles and the wall surface of the cavity 4 and the mutual collision and friction between the damping particles.

[0013] The side plates 23 extend upwards by a predetermined distance relative to the top plate 21,

[0014] A support pad 5 is arranged between the rail 1 and the support steel beam 2, i.e. the support pad 5 is clamped between the two side plates 23;

[0015] By selecting a support pad 5 with a suitable thickness, a plurality of rails are arranged at the same horizontal height, and by selecting a support pad 5 with a suitable rigidity, the support pad 5 is matched with the overall damping system.

[0016] The top plate 21, the bottom plate 22 and the side plates 23 are sealingly connected to each other, so that the cavity 4 is a closed cavity, the inside of the cavity 4 is dry, and liquid is prevented from entering.

[0017] The support steel beam 2 is continuously installed on the track slab or sleeper 3 along the length direction of the rail.

[0018] A groove is formed on the upper surface of the track slab or sleeper 3, and the support steel beam 2 is embeddedly installed in the groove;

[0019] The width dimension of the groove is slightly larger than the width dimension of the support steel beam 2, and a cement slurry or a high polymer sealing material is filled in the gap therebetween.

[0020] Wherein, between the support pad plate 5 and the steel rail 1, between the support pad plate 5 and the support steel beam 2, the close contact glue is arranged, the steel rail 1, the support pad plate 5 and the support steel beam 2 are connected into a whole through the close contact glue, so that the vibration of the steel rail 1 is transmitted to the support steel beam 2, and the vibration generated by the support steel beam 2 is fed back to the steel rail 1.

[0021] Wherein, in the cavity 4, the volume ratio of the damping particles is 80-90%.

[0022] Preferably, in the cavity 4, the particle size of the damping particles is 0.1-0.5mm.

[0023] Wherein, the fastener 6 is arranged on the upper side of the support steel beam 2, and the steel rail 1 is fixed through the fastener 6 and the support steel beam 2.

[0024] The application has the beneficial effects including:

[0025] (1) The vibration damping system of the continuous support steel rail provided by the application has the continuous support structure, the number of fastener systems can be greatly reduced, and the construction difficulty and maintenance cost are reduced;

[0026] (2) The vibration damping system of the continuous support steel rail provided by the application can continuously provide the vertical, longitudinal and transverse support stiffness of the steel rail, and prevent the steel rail from overturning;

[0027] (3) The vibration damping system of the continuous support steel rail provided by the application has sufficient strength, durability and elasticity, so that the fastener system can effectively maintain the reliable connection between the steel rail and the sleeper for a long time, and can fully play the buffering and damping performance under the action of power, and delay the accumulation of track residual deformation;

[0028] (4) The vibration damping system of the continuous support steel rail provided by the application has no stress concentration state on the steel rail, has good wheel-rail relationship, and the train runs smoothly. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The cross-sectional view of the vibration damping system of the continuous support steel rail provided by the application is shown;

[0030] Figure 2 The pad schematic diagram of the vibration damping system of the continuous support steel rail provided by the application is shown;

[0031] Figure 3 The support steel beam schematic diagram of the vibration damping system of the continuous support steel rail provided by the application is shown;

[0032] Figure 4The diagram shows a track slab or sleeper of a vibration reduction system for a continuously supported rail with particle damping provided by the present invention.

[0033] Figure 5 An exploded view of the vibration reduction system components for a continuously supported rail with particle damping provided by the present invention is shown.

[0034] Figure Labels

[0035] 1- Rail

[0036] 2-Supporting steel beams

[0037] 21-Top Plate

[0038] 22-Base Plate

[0039] 23-Side panel

[0040] 3- Track slabs or sleepers

[0041] 31-Groove

[0042] 4-Cavity

[0043] 5-Supporting pad

[0044] 6-Damping particles Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0046] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0047] This invention provides a vibration reduction system for continuously supported rails with granular damping, such as... Figure 1 , Figure 2 and Figure 3 As shown, the vibration reduction system includes a supporting steel beam 2 positioned below the rail 1, which is embedded in the track slab or sleeper 3. In this application, the track slab or sleeper 3 is a precast concrete beam with grooves 31 along the rail's extension direction on its upper surface to accommodate the supporting steel beam 2. During construction, after positional adjustment, it can be directly laid on the base, simplifying the construction process and increasing efficiency. The supporting steel beam 2 and the track slab or sleeper 3 can be prefabricated in a factory or fixedly installed on-site.

[0048] In this application, the track slab or sleeper 3 is the supporting structure under the rail in the track system. It extends along the extension direction of the rail, so that grooves can be opened to install the supporting steel beam. Before opening the grooves, its specific structural shape can also be consistent with any of the following existing structures: concrete sleeper, longitudinal sleeper, trapezoidal sleeper, track slab, frame track slab, floating slab.

[0049] The supporting steel beam 2 includes a top plate 21, a bottom plate 22 and two side plates 23 that are fixed together as one piece; each plate of the supporting steel beam 2 can be made of steel plate and connected and fixed by welding.

[0050] The cavity is filled with damping particles 6, which are selected from one or more of iron sand, lead granules, steel balls, and sand. The inventors have found that the preferred order of materials for the damping particles is: lead, steel, iron, sand, etc. Suitable damping particles can be selected according to vibration reduction performance requirements and economic considerations.

[0051] Preferably, in this application, the damping particles are approximately spherical in shape. The approximately spherical shape allows for more irregular collisions and vibrations, resulting in the best overall vibration reduction effect. More preferably, the particle size of the damping particles is 0.1–1 mm, preferably 0.2–0.4 mm. Multiple damping particles filling a cavity can have different particle sizes, as long as they are all within the specified range. The inventors have found that when the particle size is controlled within the range of 0.2–0.4 mm, the overall vibration reduction effect is optimal.

[0052] Vibrational energy is dissipated through the collision and friction between damping particles 6 and the wall of cavity 4, as well as through the collision and friction between damping particles themselves.

[0053] In a preferred embodiment, such as Figure 1 As shown, the side plate 23 extends upwards a predetermined distance relative to the top plate 21.

[0054] A support pad 5 is provided between the rail 1 and the supporting steel beam 2, that is, the support pad 5 is sandwiched between two side plates 23; the support pad 5 is a steel plate or an elastic pad, and there are multiple models with different thicknesses and correspondingly different stiffnesses, so as to adapt to different working conditions.

[0055] By selecting support plates 5 of appropriate thickness, multiple rails are positioned at the same horizontal level. Simultaneously, support plates 5 of appropriate stiffness are selected to ensure overall compatibility with the vibration damping system. The support plates 5 can also be placed at the bottom of the support beam 2, so that the top of the side plates 23 is flush with the lower flange of the rail 1. This structural design allows the two side plates 23 to clamp the rail 1 from both sides, while the support plates 5 support the rail from below. Combined with fasteners and other limiting mechanisms, complete omnidirectional fixation of the rails can be achieved.

[0056] In the present application, the main part of the side plate 23 is embedded in the track plate or sleeper 3 along with the support steel beam 2, and the small part protruding on both sides of the steel rail is the protruding part. Such design makes the protruding part limit the lateral displacement of the steel rail, provides lateral stiffness and support for the steel pipe, ensures that the lateral stiffness of the track system is large enough, and guarantees the long-term stable operation of the track system.

[0057] In a preferred embodiment, the top plate 21, the bottom plate 22 and the two side plates 23 together form a cavity 4. It is emphasized that, since the length of the support steel beam can be infinite and consistent with the length of the steel rail, an end plate is not required. The top plate 21, the bottom plate 22 and the side plates 23 are sealed to each other, preferably by welding, so that the cavity 4 is a sealed cavity, and the inside of the cavity 4 is dry to prevent liquid from entering.

[0058] In a preferred embodiment, the support steel beam 2 is continuously installed on the track plate or sleeper 3 along the length direction of the steel rail, as shown in Figure 1 .

[0059] A groove is formed on the upper surface of the track plate or sleeper 3, and the support steel beam 2 is embedded and installed in the groove;

[0060] The width of the groove is slightly larger than the width of the support steel beam 2, and the gap therebetween is filled with cement slurry or high polymer sealing material, i.e. after the support steel beam 2 is placed, the gap between the support steel beam 2 and the groove is filled with cement slurry or high polymer sealing material to seal.

[0061] In a preferred embodiment, a close contact adhesive is provided between the support pad plate 5 and the steel rail 1, and between the support pad plate 5 and the support steel beam 2, which plays a close contact role. The steel rail 1, the support pad plate 5 and the support steel beam 2 are connected into a whole through the close contact adhesive, so that the vibration of the steel rail 1 is transmitted to the support steel beam 2, and the vibration generated by the support steel beam 2 is fed back to the steel rail 1.

[0062] The vibration phase of the support steel beam 2 is obviously "lagging behind" the vibration phase of the steel rail 1 due to the configuration of the particle damping system, so as to realize the phase difference of vibration, offset the vibration energy, and make the vibration of the steel rail 1 decay rapidly.

[0063] Preferably, in the cavity 4, the volume ratio of the damping particles 6 is 80-90%, and preferably about 85%. The applicant has found that, according to the vibration characteristics of the railway system, the vibration reduction performance is best when the volume ratio is about 85%, which can maximize the vibration reduction effect.

[0064] The application has been described above with reference to preferred embodiments. However, these embodiments are merely exemplary and are intended to be illustrative only. Various substitutions and alterations are possible in view of the disclosure of this application without departing from the spirit and scope of the application.

Claims

1. A vibration damping system for continuously supported steel rails with particle damping, characterized in that The damping system comprises a support steel beam (2) arranged below the steel rail (1), which is embeddedly installed on the track slab or sleeper (3); A groove (31) for accommodating the installation of the support steel beam (2) is formed on the upper surface of the track slab or sleeper (3) along the extension direction of the steel rail; The support steel beam (2) comprises a top plate (21), a bottom plate (22), and two side plates (23) which are integrally fixed; The top plate (21), the bottom plate (22), and the two side plates (23) jointly form a cavity (4), The cavity is filled with damping particles (6) selected from one or more of lead particles, steel balls, and sand; The vibration energy is consumed through the collision and friction of the damping particles with the wall surface of the cavity (4) and the mutual collision and friction between the damping particles (6); The support steel beam (2) is continuously installed on the track slab or sleeper (3) along the length direction of the steel rail; A groove is formed on the upper surface of the track slab or sleeper (3), and the support steel beam (2) is embeddedly installed in the groove; The width dimension of the groove is slightly larger than the width dimension of the support steel beam (2), and a cement slurry or a high polymer sealing material is filled in the gap therebetween; In the cavity (4), the volume proportion of the damping particles (6) is 85%; In the cavity (4), the particle size of the damping particles (6) is 0.2-0.4 mm; The side plates (23) protrude upward relative to the top plate (21) by a predetermined distance, and a support backing plate (5) is arranged between the steel rail (1) and the support steel beam (2), i.e., the support backing plate (5) is clamped between the two side plates (23); By selecting a support backing plate (5) with a suitable thickness, a plurality of steel rails are arranged at the same horizontal height; meanwhile, by selecting a support backing plate (5) with a suitable rigidity, the support backing plate (5) is matched with the whole damping system; the two side plates (23) clamp the steel rail (1) on both sides, and the support backing plate (5) supports the steel rail from below, and then a fastener is used, so that the steel rail can be completely fixed in all directions; The top plate (21), the bottom plate (22), and the side plates (23) are sealingly connected with each other, so that the cavity (4) is a closed cavity, the inside of the cavity (4) is dry, and liquid is prevented from entering.

2. The damping system with particle damping and continuous support steel rail according to claim 1, wherein A close-contact adhesive is arranged between the support backing plate (5) and the steel rail (1) and between the support backing plate (5) and the support steel beam (2), the steel rail (1), the support backing plate (5), and the support steel beam (2) are connected into a whole through the close-contact adhesive, so that the vibration of the steel rail (1) is transmitted to the support steel beam (2), and the vibration generated by the support steel beam (2) is fed back to the steel rail (1).

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