CN105350403B - Track plates and track plates vibration insulating system with periodic structure feature - Google Patents

Abstract

A track slab with periodic structural features, the track slab is formed by stacking several layers of periodic substructures; the materials of adjacent periodic substructures are different, and the thickness of each layer of periodic substructures depends on the height of the track and the The vibration reduction effect is determined according to the requirements, and the vibration reduction is realized through the elastic wave band gap principle. The thickness dimensions of the periodic substructures of each layer are the same; the thickness dimensions of the periodic substructures of each layer are consistent with the vibration wavelength of interest to improve the vibration reduction effect, and the vibration reduction is realized through the elastic wave band gap principle. A track slab damping system with periodic structural features, including the track slab, fastener system, rail, base, CAM mortar layer and boss; the rail is fixed on the track slab through the fastener system; the The track slab is placed on the base through the CAM mortar layer and laid continuously along the line extension direction. The track slab damping system can be used in urban rail transit, high-speed railway, heavy-duty railway and ordinary railway. The invention is helpful for vibration and noise reduction control of urban rail transit, high-speed railway, heavy-duty railway and ordinary railway, and has the advantages of simple structure, convenient and flexible construction and maintenance.

Description

Track slab and track slab damping system with periodic structural features

technical field

The invention belongs to the technical field of rail transportation, and relates to a railway track structure, in particular to a vibration-reducing ballastless track structure suitable for urban rail transportation, high-speed railways, heavy-duty railways and ordinary railways.

Background technique

With the rapid development of rail transit, the vibration problem caused by it has become increasingly prominent. The track structure is not only a vibration source, but also one of the important transmission paths, and its vibration damping ability will directly affect the final vibration response of the surrounding environment of rail transit.

The existing track structure vibration reduction measures mainly focus on reducing component stiffness and increasing component damping. However, in practical applications, it will have a certain impact on the safety and comfort of train operation. As for the vibration reduction measures of fasteners, the data show that the application of track damper fasteners and pioneer fasteners in my country's subways is not ideal, which induces serious rail corrugation, and the intensification of corrugation will cause high wheel and rail frequency vibration, causing the vehicle to resonate. The reason is that when the stiffness of the fastener is reduced, most of the vibration energy is isolated from the lower foundation, and the vibration energy is concentrated on the rail, which causes greater damage to the rail. And if the foundation under the rail is soft, the vibration displacement of the rail can even reach 4-5mm, seriously affecting the safe operation of the upper vehicle. For the vibration reduction of the floating slab track, it has better vibration reduction performance for the frequency band above the natural frequency. However, when the frequency of the load is lower than the natural frequency of the floating slab structure, the vibration reduction performance of the floating slab is not ideal. Even vibrations will be amplified. In addition, the stiffness of the foundation under the slab is reduced. On the one hand, the vertical dynamic displacement of the rail surface is increased, and on the other hand, the vertical displacement difference between adjacent track slabs is increased, causing the track surface to be uneven. The combination of the two can easily cause the upper train to derail. , affecting the safety of train operation.

Contents of the invention

A periodic structure is a structural form in which its basic units are stacked in the same way. In solid state physics, a periodic structure has an attenuation domain characteristic for elastic waves, that is, a band gap characteristic. When the frequency of the elastic wave falls within the range of the attenuation domain (band gap), the propagation of the wave will be greatly attenuated. When the frequency of the elastic wave is outside the attenuation domain (band gap), the elastic wave will be able to propagate forward smoothly.

Inspired by the bandgap characteristics of periodic structures, this invention proposes a track slab vibration damping system with periodic structural characteristics for rail transit. By rationally designing geometric parameters and material parameters, an attenuation domain with a certain width can be generated and can cover various The main frequency of similar vibrations, so that the overall vibration of the structure to be protected or affected by the environment is greatly attenuated. Compared with other damping forms, the track plate structure of the present invention has the following advantages:

(1) Using the bandgap characteristic of the periodic structure itself to reduce vibration, no additional structure is required.

(2) The attenuation domain of the periodic structure has a certain width, rather than a single frequency. Therefore, the periodic structure can isolate the vibration within a certain frequency range, and has a high comprehensive vibration reduction performance.

The object of the present invention is to aim at the deficiencies and defects of the prior art, and propose a track slab vibration damping system with periodic structural characteristics for rail transit. Vibration thinking, by changing the structure of the track slab itself, when the stiffness of the track structure is high enough, the principle of elastic wave bandgap is used to achieve the purpose of vibration reduction, which is helpful for the vibration and noise reduction control of urban rail transit, high-speed railway and heavy-duty railway , Promote the harmonious development of society, especially a vibration-reducing ballastless track structure suitable for urban rail transit, high-speed railway, heavy-duty railway and ordinary railway.

To achieve the above object, the present invention adopts the following technical solutions:

A track slab with periodic structural features, the track slab is formed by stacking several layers of periodic substructures; the materials of adjacent periodic substructures are different, and the thickness of each layer of periodic substructures depends on the height of the track and the The vibration reduction effect is determined according to the requirements, and the vibration reduction is realized through the elastic wave band gap principle.

Further, the thickness dimensions of the periodic substructures of each layer are the same to form 2-layer periodic, 3-layer periodic or multi-layer periodic structures at equal intervals; in other words, two layers of plates of different materials are used as a periodic unit, or three layers of different A plate of material acts as a periodic unit, and so on.

The thickness dimension of the periodic substructure of each layer is consistent with the concerned vibration wavelength to improve the vibration damping effect.

The cross-sectional shape of the track plate includes a rectangle.

The track plate is provided with several periodic slave structures in the length direction or the width direction, or the length direction and the width direction at the same time, and the periodic slave structures are arranged at regular intervals in the longitudinal length and transverse width directions; preferably, the periodic The secondary structure is integrated or perforated by fillers; preferably, the fillers include columnar fillers and conical fillers.

The number of structures in the length and width ranges of the periodic slave structure should be greater than 3; preferably, its structure size is less than 1/10 of the size of the track plate; preferably, the thickness of the periodic slave structure is flush with the track plate.

The shorter the wavelength of the wave that the track needs to dampen, the greater the number of periodic slave structures per unit length, width and thickness dimensions.

The material of the periodic substructure and the periodic substructure can be reinforced concrete, rubber, alloy material or metal.

A track slab damping system with periodic structural features, comprising the above-mentioned track slab, a fastener system, a rail, a base, a CAM (Cement Asphalt Mortar) mortar layer and a boss; the rail is fixed on the track by a fastener system on the slab; the track slab is placed on the base through the CAM mortar layer, and laid continuously along the line extension direction.

The application of the track slab damping system with periodic structural features in urban rail transit, high-speed railway, heavy-duty railway and ordinary railway.

Owing to adopting above-mentioned technical scheme, the present invention has following beneficial effect:

①By changing the structural form of the track slab and utilizing the band gap characteristics of the periodic structure, the vibration reduction effect is achieved while ensuring the stiffness of the track slab and without attaching other structures;

②The idea of structural vibration reduction is adopted, which reduces the hidden dangers to the safety and stability of train operation in the traditional idea of vibration reduction;

③ This track plate vibration damping system with periodic structural characteristics can isolate vibration within a certain frequency range and has high comprehensive vibration damping performance;

④Periodic characteristics The structure of the track slab is simple, and the construction and maintenance are convenient and flexible.

Description of drawings

Fig. 1 is an embodiment of the damping system of the track plate including the periodic structure feature of the present invention - a schematic view of the track system with a layered periodic structure arranged in the thickness direction of the track plate.

Fig. 2 is a left view of the embodiment shown in Fig. 1 - a track system with a layered periodic structure arranged in the thickness direction of the track plate.

Fig. 3 is a schematic view of the track system in the embodiment shown in Fig. 1 - a track system with a periodic structure arranged in the length and width directions of the track plate.

Fig. 4 is a left view of the embodiment shown in Fig. 1 - a track system with periodic structures arranged in the length and width directions of the track slab.

Fig. 5 is a structural schematic diagram of a track plate with periodic structural features in an embodiment of the present invention.

The marks in the figure are as follows: 1-periodic track slab, 2-fastener system, 3-rail, 4-base, 5-CAM mortar layer, 6-boss, 7-substructure of the first period, 8-second period Substructure, 9-hole, 10-filler.

detailed description

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

Please refer to Fig. 1-3, the present invention comprises: a kind of rail traffic has the track plate damping system of periodic structural feature, and it comprises the track plate 1 with periodic structural feature, and track plate 1 comprises the first periodic element of equal interval The structure 7 and the second period substructure 8 are superimposed; the base 4, the CAM mortar layer 5 and the boss 6; the track plate 1 is placed on the base 4 through the CAM mortar layer 5, and is laid continuously along the line extension direction .

The track plate 1 can realize the horizontal and vertical multi-position constraints of the track structure through the boss 6 .

Embodiment 1: The track plate 1 is provided with several layered interval periodic substructures within the thickness range, the track plate 1 includes a first period substructure 7 and a second period substructure 8, and the first period substructure 7 and the second period substructure The structural dimensions of the substructures 8 are the same or similar, but the composition materials are different. As a preference, the materials of the first periodic substructure 7 and the second periodic substructure 8 can be concrete, rubber and metal, etc., as shown in Figures 1-2 .

The thickness dimension design of the first period substructure 7 and the second period substructure 8 of the track plate 1 should consider the factors such as track height and vibration damping effect, as a preference, take the first period substructure 7 and the second period substructure 8 The thickness dimension is consistent with the vibration wavelength of interest, and the vibration reduction effect is remarkable.

The cross-sectional shape of the track plate 1 in the thickness direction can be a plurality of rectangular flat plates and plate shell structures with any shape. It is preferable to use a rectangular layered thin plate, which has a good vibration damping effect and low construction difficulty.

The periodic track plate 1 can be formed into a periodic structure with intervals of 2 layers, 3 layers or multiple layers according to the need of vibration reduction.

In other words, the periodic track slab 1 can further include more substructures such as the third period substructure and the fourth period substructure. The materials can be completely different. Similarly, as a preference, the materials of each substructure can be concrete, rubber and metal, etc., as shown in Fig. 1-Fig. 2 .

Embodiment 2: The periodic track plate 1 can also be provided with some periodic slave structures in the length direction, the width direction, or the length direction and the width direction at the same time, and these periodic slave structures include holes 9 and filling bodies 10, and the These holes must have the same structure size, the same regular distribution, and equal spacing in all directions. At the same time, it is also possible to consider setting some columns or cones and filling bodies 10 of other shapes in these holes 9, and then connect with the periodic track plate 1 stacked into a whole, presenting a periodic arrangement at regular intervals in the lengthwise direction and widthwise direction, as shown in Figures 3-5. Preferably, in addition to the form of the columnar periodic slave structure 9, a conical periodic slave structure can also be used, either a forward cone or an inverted cone, which has a good vibration damping effect and low construction difficulty.

The number of holes 9 of the periodic track plate 1 and the number of structures in the length and width of the filling body 10 should be greater than 3, and its structural size is less than 1/10 of the track plate 1, and its vibration damping effect is remarkable ; For the convenience of construction and maintenance, the thickness of the cycle structure should be flush with the track plate 1.

The shorter the wavelength of the wave that needs to be damped by the track, the greater the number of periods of the periodic track plate 1 within a certain range of length, width and thickness of the holes 9 and fillers 10 of the periodic track plate 1 .

The periodic substructure and periodic substructure of the periodic track slab 1 can be made of materials such as concrete slabs, hard rubber slabs, alloy material slabs or metal plates.

In a specific application, the steel rail 3 is fixed on the continuously laid periodic track slab 1 through the fastener system 2 .

The above description of the embodiments is for those of ordinary skill in the art to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (3)

1. A track slab with periodic structural features, characterized in that: the track slab is formed by superimposing several layers of periodic substructures; the composition materials of adjacent periodic substructures are different, and the periodic substructures of each layer The thickness dimension is determined according to the height of the track and the requirements of the vibration reduction effect, and the vibration reduction is realized through the principle of elastic wave band gap; the track plate is provided with several periodic slave structures in the length direction or width direction, or the length direction and the width direction at the same time, and the period The secondary structure presents a certain periodical arrangement at equal intervals in the longitudinal length and transverse width directions, and the periodic secondary structure is formed as a whole by the combination or perforation of fillers; The thickness dimensions of the periodic substructures of each layer are the same to form 2-layer periodic, 3-layer periodic or multi-layer periodic structures at equal intervals; the thickness dimensions of the periodic substructures of each layer are consistent with the vibration wavelength concerned to improve the vibration reduction effect; The cross-sectional shape of the track plate includes a rectangle; the number of structures in the length and width ranges of the periodic slave structure should be greater than 3; the structural size of the periodic slave structure is less than 1/10 of the track plate size, and the periodic slave structure The thickness of the track plate is flush with the track plate, and the filler includes a columnar filler and a conical filler; the shorter the wavelength of the wave that needs to be damped by the track, the number of the period from the structure in the unit length, width and thickness dimension range The more; the material of the periodic substructure and the periodic substructure can be reinforced concrete, rubber or metal materials. 2. A track slab damping system with periodic structural features, characterized in that it includes the track slab (1), fastener system (2), rail (3), base (4), The CAM mortar layer (5) and the boss (6); the rail (3) is fixed on the track plate (1) through the fastener system (2); the track plate (1) is placed on the track plate (1) through the CAM mortar layer (5) On the base (4), and lay continuously along the extending direction of the line. 3. The application of the track slab vibration damping system with periodic structural features according to claim 2 in urban rail transit, high-speed railway, heavy-duty railway and ordinary railway.