A vibration isolation device for a rail floating slab

Abstract

The application provides a vibration isolation device for a track floating slab, which comprises a top plate, a bottom plate, a steel spring and a plurality of variable stiffness components, two ends of the steel spring are connected with the top plate and the bottom plate correspondingly, the plurality of variable stiffness components are arranged in a ring shape and are spaced apart at the periphery of the steel spring, each variable stiffness component comprises a top plate pull rod, a bottom plate pull rod and a prestressed shape memory alloy pull rod, the upper end of the top plate pull rod is connected with the top plate, the lower end of the bottom plate pull rod is connected with the bottom plate, and the two ends of the prestressed shape memory alloy pull rod are connected with the lower end of the top plate pull rod and the upper end of the bottom plate pull rod correspondingly. The vibration isolation device for the track floating slab has the variable stiffness characteristics of high static stiffness and low dynamic stiffness, and has good vibration isolation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, in particular to a vibration isolation device for a rail floating slab. BACKGROUND

[0002] With the acceleration of urbanization, rail transit develops rapidly, and the vibration of the track caused by the operation of the subway train has caused many influences on the nearby building structure, the life of residents and precision instruments.

[0003] In the prior art, the spring floating slab uses a coil spring to support between the rail floating slab and the roadbed, and the track vibration caused by the operation of the train is transmitted to the foundation after passing through the coil spring, so the stiffness of the spring is an important parameter affecting the vibration isolation effect, the lower the stiffness, the better the vibration isolation effect, but too low stiffness will cause excessive track settlement, which seriously affects the safety of the train. According to many test results in China, the spring floating slab can effectively reduce the subway train vibration at medium and high frequencies (20-80 Hz), and the vibration reduction effect can reach more than 20 dB, but it is easy to cause resonance for low frequency vibration (4-10 Hz).

[0004] Therefore, it is an urgent problem to provide a variable stiffness vibration isolation device with high static stiffness and low dynamic stiffness and apply it to the rail floating slab. SUMMARY

[0005] The present application aims to provide a vibration isolation device for a rail floating slab, which has a variable stiffness characteristic of high static stiffness and low dynamic stiffness, and good vibration isolation effect.

[0006] The present application provides a vibration isolation device for a rail floating slab, which comprises a top plate, a bottom plate, a steel spring and a plurality of variable stiffness components, both ends of the steel spring are connected to the top plate and the bottom plate respectively, a plurality of variable stiffness components are arranged in a ring shape and spaced apart on the periphery of the steel spring, each variable stiffness component comprises a top plate pull rod, a bottom plate pull rod and a pre-stressed shape memory alloy pull rod, the upper end of the top plate pull rod is connected to the top plate, the lower end of the bottom plate pull rod is connected to the bottom plate, and both ends of the pre-stressed shape memory alloy pull rod are connected to the lower end of the top plate pull rod and the upper end of the bottom plate pull rod respectively.

[0007] The vibration isolation device for a rail floating slab provided by the present application further comprises a damping device, which is arranged on the periphery of the steel spring, and both ends of the damping device are connected to the top plate and the bottom plate respectively.

[0008] The vibration isolation device for a rail floating slab provided by the present application is provided with a lower limiting rubber pad below each top plate pull rod, and each lower limiting rubber pad is connected to the bottom plate.

[0009] According to the application, an isolation device for a track floating slab is provided, wherein an upper limiting rubber pad is arranged above each bottom plate pull rod, and each upper limiting rubber pad is connected with the top plate.

[0010] According to the application, an isolation device for a track floating slab is provided, wherein the top plate pull rod comprises a top plate vertical connecting rod and a first horizontal connecting plate, the upper end of the top plate vertical connecting rod is connected with the top plate perpendicularly, the lower end of the top plate vertical connecting rod is connected with the first horizontal connecting plate perpendicularly, and the first horizontal connecting plate is connected with the lower end of the pre-stressed shape memory alloy pull rod perpendicularly.

[0011] According to the application, an isolation device for a track floating slab is provided, wherein the top plate pull rod further comprises a second horizontal connecting plate, the upper end of the top plate vertical connecting rod is connected with the second horizontal connecting plate perpendicularly, and the second horizontal connecting plate is connected with the lower surface of the top plate through a plurality of first connecting bolts.

[0012] According to the application, an isolation device for a track floating slab is provided, wherein the bottom plate pull rod comprises a bottom plate vertical connecting rod and a third horizontal connecting plate, the lower end of the bottom plate vertical connecting rod is connected with the bottom plate perpendicularly, the upper end of the bottom plate vertical connecting rod is connected with the third horizontal connecting plate perpendicularly, and the third horizontal connecting plate is connected with the upper end of the pre-stressed shape memory alloy pull rod perpendicularly.

[0013] According to the application, an isolation device for a track floating slab is provided, wherein the bottom plate pull rod further comprises a fourth horizontal connecting plate, the lower end of the bottom plate vertical connecting rod is connected with the fourth horizontal connecting plate perpendicularly, and the fourth horizontal connecting plate is connected with the upper surface of the bottom plate through a plurality of second connecting bolts.

[0014] According to the application, an isolation device for a track floating slab is provided, wherein the two ends of the pre-stressed shape memory alloy pull rod are respectively connected with the lower end of the top plate pull rod and the upper end of the bottom plate pull rod correspondingly, or the two ends of the pre-stressed shape memory alloy pull rod are respectively fixedly connected with the lower end of the top plate pull rod and the upper end of the bottom plate pull rod correspondingly.

[0015] According to the application, an isolation device for a track floating slab is provided, wherein the upper end of the steel spring is connected with the center position of the top plate, the lower end of the steel spring is connected with the center position of the bottom plate, and a plurality of variable stiffness assemblies are uniformly distributed around the steel spring.

[0016] The application provides a vibration isolation device for a track floating slab, which is characterized in that a steel spring is connected between a top plate and a bottom plate, a plurality of variable stiffness components are arranged in a ring shape at the periphery of the steel spring, each variable stiffness component comprises a top plate pull rod, a bottom plate pull rod and a pre-stressed shape memory alloy pull rod, the upper end of the top plate pull rod is connected with the top plate, the lower end of the bottom plate pull rod is connected with the bottom plate, and the two ends of the pre-stressed shape memory alloy pull rod are respectively connected with the lower end of the top plate pull rod and the upper end of the bottom plate pull rod, wherein the stiffness provided by the steel spring is constant, and the stiffness provided by each pre-stressed shape memory alloy pull rod is variable, so that the vibration isolation device for the track floating slab has the variable stiffness characteristics of high static stiffness and low dynamic stiffness through the cooperation of each pre-stressed shape memory alloy pull rod and the steel spring, and has a good vibration isolation effect on the track vibration caused by the operation of a subway train. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 It is a first direction axonometric view of the vibration isolation device for the track floating slab of the application.

[0019] Figure 2 It is a second direction axonometric view of the vibration isolation device for the track floating slab of the application.

[0020] Figure 3 It is a sectional structure schematic view of the vibration isolation device for the track floating slab of the application.

[0021] Figure 4 It is a structure schematic view of the variable stiffness component in the vibration isolation device for the track floating slab of the application.

[0022] Figure 5 It is another structure schematic view of the variable stiffness component in the vibration isolation device for the track floating slab of the application.

[0023] Figure 6 It is a reaction force displacement curve diagram of the vibration isolation device for the track floating slab of the application under a monotonic load.

[0024] Figure 7 It is a stiffness displacement curve diagram of the vibration isolation device for the track floating slab of the application under a monotonic load.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1, top plate; 2, bottom plate; 3, steel spring; 4, top plate pull rod; 401, top plate vertical connecting rod; 402, first horizontal connecting plate; 403, second horizontal connecting plate; 5, bottom plate pull rod; 501, bottom plate vertical connecting rod; 502, third horizontal connecting plate; 503, fourth horizontal connecting plate; 6, prestressed shape memory alloy pull rod; 7, damping device; 8, lower limit rubber pad; 9, first connecting bolt; 10, second connecting bolt. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly specified. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] As Figures 1 to 7As shown, the vibration isolation device for track floating slab in the embodiment of the present application comprises a top plate 1, a bottom plate 2, a steel spring 3 and a plurality of variable stiffness components, both ends of the steel spring 3 are connected with the top plate 1 and the bottom plate 2 correspondingly, the plurality of variable stiffness components are arranged in a ring shape at the periphery of the steel spring 3, each variable stiffness component comprises a top plate pull rod 4, a bottom plate pull rod 5 and a prestressed shape memory alloy pull rod 6, the upper end of the top plate pull rod 4 is connected with the top plate 1, the lower end of the bottom plate pull rod 5 is connected with the bottom plate 2, both ends of the prestressed shape memory alloy pull rod 6 are connected with the lower end of the top plate pull rod 4 and the upper end of the bottom plate pull rod 5 correspondingly.

[0031] In use, the vibration isolation device for track floating slab can be installed between the track floating slab and the roadbed, wherein the stiffness provided by the steel spring 3 is constant, and the stiffness provided by each prestressed memory alloy pull rod 6 is variable. Among them, Figure 6 the reaction displacement curve diagram of the vibration isolation device for track floating slab under monotonic load, Figure 7 the stiffness displacement curve diagram of the vibration isolation device for track floating slab under monotonic load. Thus, through the cooperation of each prestressed memory alloy pull rod 6 and the steel spring 3, the vibration isolation device for track floating slab has the variable stiffness characteristics of high static stiffness and low dynamic stiffness, and has good vibration isolation effect on the track vibration caused by the operation of the subway train.

[0032] Specifically, the initial prestress of the prestressed memory alloy pull rod 6 should not be greater than its super-elastic stress. When the dynamic load displacement of the prestressed memory alloy pull rod 6 is large, it will enter the super-elastic section, and then temporarily lose stiffness. At this time, the total stiffness of the vibration isolation device for track floating slab is approximately the stiffness of the steel spring 3.

[0033] In some embodiments of the present application, the vibration isolation device for track floating slab further comprises a damping device 7, which is arranged at the periphery of the steel spring 3, and both ends of the damping device 7 are connected with the top plate 1 and the bottom plate 2 correspondingly. By arranging the damping device 7, the vibration energy can be consumed, and the energy dissipation capacity of the vibration isolation device can be improved.

[0034] As shown in the drawings, Figures 1 to 3 In some embodiments of the present application, a lower limit rubber pad 8 can be arranged below each top plate pull rod 4, and each lower limit rubber pad 8 is connected with the bottom plate 2. That is, there is a certain spacing between the lower limit rubber pad 8 and the top plate pull rod 4. By arranging the lower limit rubber pad 8, the prestressed memory alloy pull rod 6 can be prevented from being pulled off due to excessive displacement of the vibration isolation device.

[0035] Alternatively, upper limit rubber pads (not shown in the figure) can be installed above each base plate tie rod 5, and each upper limit rubber pad is connected to the top plate 1. That is, there is a certain gap between the upper limit rubber pad and the base plate tie rod 5. By setting the upper limit rubber pads, the prestressed shape memory alloy tie rod 6 can be prevented from being pulled apart due to excessive displacement of the vibration isolation device.

[0036] Alternatively, lower limit rubber pads 8 can be installed below each top plate tie rod 4, and upper limit rubber pads can be installed above each bottom plate tie rod 5. The lower limit rubber pads 8 are connected to the bottom plate 2, and the upper limit rubber pads are connected to the top plate 1. By installing lower and upper limit rubber pads 8 respectively, the prestressed memory alloy tie rods 6 can be effectively prevented from breaking due to excessive displacement of the vibration isolation device.

[0037] like Figure 4 As shown, in some embodiments of the present invention, the top plate tie rod 4 includes a top plate vertical connecting rod 401 and a first horizontal connecting plate 402. The upper end of the top plate vertical connecting rod 401 is vertically connected to the top plate 1, and the lower end of the top plate vertical connecting rod 401 is vertically connected to the first horizontal connecting plate 402. The first horizontal connecting plate 402 is vertically connected to the lower end of the prestressed shape memory alloy tie rod 6. Both the top plate tie rod 4 and the top plate 1 are metal plates. The top plate tie rod 4 and the top plate 1 can be configured as an integrally formed structure, or the top plate vertical connecting rod 401 can be welded and fixed to the lower surface of the top plate 1.

[0038] like Figure 5 As shown, in some embodiments of the present invention, the top plate tie rod 4 further includes a second horizontal connecting plate 403, and the upper end of the top plate vertical connecting rod 401 is vertically connected to the second horizontal connecting plate 403. The second horizontal connecting plate 403 can be connected and fixed to the lower surface of the top plate 1 by a plurality of first connecting bolts 9.

[0039] like Figure 4 As shown, in some embodiments of the present invention, the base plate tie rod 5 includes a base plate vertical connecting rod 501 and a third horizontal connecting plate 502. The lower end of the base plate vertical connecting rod 501 is vertically connected to the base plate 2, and the upper end of the base plate vertical connecting rod 501 is vertically connected to the third horizontal connecting plate 502. The third horizontal connecting plate 502 is vertically connected to the upper end of the prestressed shape memory alloy tie rod 6. Both the base plate tie rod 5 and the base plate 2 are metal plates. The base plate tie rod 5 and the base plate 2 can be configured as an integrally formed structure, or the base plate vertical connecting rod 501 can be welded and fixed to the upper surface of the base plate 2.

[0040] like Figure 5As shown, in some embodiments of the present application, the bottom plate pull rod 5 further comprises a fourth horizontal connecting plate 503, the lower end of the bottom plate vertical connecting rod 501 is connected with the fourth horizontal connecting plate 503 vertically, and the fourth horizontal connecting plate 503 can be connected and fixed with the upper surface of the bottom plate 2 through a plurality of second connecting bolts 10.

[0041] In some embodiments of the present application, the two ends of the prestressed shape memory alloy pull rod 6 can be respectively hinged with the lower end of the top plate pull rod 4 and the upper end of the bottom plate pull rod 5. Alternatively, the two ends of the prestressed shape memory alloy pull rod 6 can be respectively fixedly connected with the lower end of the top plate pull rod 4 and the upper end of the bottom plate pull rod 5.

[0042] In some embodiments of the present application, the upper end of the steel spring 3 is connected with the center position of the top plate 1, and the lower end of the steel spring 3 is connected with the center position of the bottom plate 2. A plurality of variable stiffness components are uniformly distributed around the steel spring 3.

[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vibration isolation device for a track floating slab, characterized in that, The device includes a top plate, a bottom plate, a steel spring, and multiple variable stiffness components. The two ends of the steel spring are respectively connected to the top plate and the bottom plate. The multiple variable stiffness components are arranged in a ring around the steel spring. Each variable stiffness component includes a top plate tie rod, a bottom plate tie rod, and a prestressed shape memory alloy tie rod. The upper end of the top plate tie rod is connected to the top plate, the lower end of the bottom plate tie rod is connected to the bottom plate, and the two ends of the prestressed shape memory alloy tie rod are respectively connected to the lower end of the top plate tie rod and the upper end of the bottom plate tie rod. Each of the top plate tie rods is provided with a lower limit rubber pad below it, and each of the lower limit rubber pads is connected to the bottom plate. Each of the bottom plate tie rods is provided with an upper limit rubber pad above it, and each of the upper limit rubber pads is connected to the top plate. The top plate tie rod includes a top plate vertical connecting rod and a first horizontal connecting plate. The upper end of the top plate vertical connecting rod is vertically connected to the top plate, and the lower end of the top plate vertical connecting rod is vertically connected to the first horizontal connecting plate. The first horizontal connecting plate is vertically connected to the lower end of the prestressed shape memory alloy tie rod. The base plate tie rod includes a base plate vertical connecting rod and a third horizontal connecting plate. The lower end of the base plate vertical connecting rod is vertically connected to the base plate, and the upper end of the base plate vertical connecting rod is vertically connected to the third horizontal connecting plate. The third horizontal connecting plate is vertically connected to the upper end of the prestressed shape memory alloy tie rod. The two ends of the prestressed shape memory alloy tie rod are respectively hinged to the lower end of the top plate tie rod and the upper end of the bottom plate tie rod, or the two ends of the prestressed shape memory alloy tie rod are respectively fixedly connected to the lower end of the top plate tie rod and the upper end of the bottom plate tie rod.

2. The vibration isolation device for a track floating slab according to claim 1, characterized in that, It also includes a damping device, which is disposed around the steel spring, and the two ends of the damping device are respectively connected to the top plate and the bottom plate.

3. The vibration isolation device for a track floating slab according to claim 1, characterized in that, The top plate tie rod also includes a second horizontal connecting plate. The upper end of the top plate vertical connecting rod is vertically connected to the second horizontal connecting plate. The second horizontal connecting plate is fixed to the lower surface of the top plate by a plurality of first connecting bolts.

4. The vibration isolation device for a track floating slab according to claim 1, characterized in that, The base plate tie rod also includes a fourth horizontal connecting plate. The lower end of the base plate vertical connecting rod is perpendicularly connected to the fourth horizontal connecting plate. The fourth horizontal connecting plate is fixed to the upper surface of the base plate by a plurality of second connecting bolts.

5. The vibration isolation device for a track floating slab according to any one of claims 1 to 4, characterized in that, The upper end of the steel spring is connected to the center of the top plate, and the lower end of the steel spring is connected to the center of the bottom plate; multiple variable stiffness components are evenly distributed around the steel spring.

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