CN111663373B

CN111663373B - Shock absorption and isolation floating slab track

Info

Publication number: CN111663373B
Application number: CN202010497685.0A
Authority: CN
Inventors: 周锐; 汪小渝; 任伟新; 杜彦良
Original assignee: Shenzhen University
Current assignee: Daoerdao Technology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2022-02-15
Anticipated expiration: 2040-06-04
Also published as: CN111663373A

Abstract

The invention relates to a shock absorption and isolation floating slab track, which comprises: a ballast bed; the track plate is arranged on the track bed; the vibration damping piece is arranged between the track bed and the track slab and comprises a plurality of first vibration damping pads and a plurality of second vibration damping pads, the durability and the vibration damping performance of the first vibration damping pads are different from those of the second vibration damping pads, and the first vibration damping pads and the second vibration damping pads are connected to the outer side of the track slab in an array structure; a rail connected to the rail plate; and a fastener fastening the rail to the rail plate. According to the shock absorption and isolation floating slab track, the shock absorption pieces are dispersed into the plurality of independent shock absorption pads to play a role in supporting, shock absorption and isolation, the use of materials of the shock absorption pads is reduced, and the mounting, adjustment and replacement of the shock absorption pads are facilitated; through setting up two kinds of durability and the damping pad that damping performance is different, can rationally arrange the demand that makes up two kinds of damping pads in order to satisfy vibration isolation under the train load effect simultaneously and the shock insulation under the earthquake load effect.

Description

Shock absorption and isolation floating slab track

Technical Field

The invention relates to the technical field of rail transit, in particular to a shock absorption and isolation floating slab rail.

Background

In the existing floating slab track structure, a damping pad is arranged between a track bed and a track slab, the damping pad is mostly attached to the outer side of the track slab in a single layer and is positioned between the track bed and the track slab, the rubber damping pad is easy to age, the damping pad needs to be integrally replaced after being damaged or aged, the service cycle of the damping pad is limited, and the anti-seismic performance of the floating slab under the action of strong shock needs to be enhanced.

Disclosure of Invention

Therefore, it is necessary to provide a shock absorption and isolation floating slab track with easy replacement of a shock absorption pad and good shock absorption and isolation/isolation effects.

An isolation-reducing floating slab track comprising:

a ballast bed;

the track slab is arranged on the track bed and comprises a plurality of sub-track slabs which are arranged side by side at intervals;

the vibration damping piece is arranged between the track bed and the track slab and comprises a plurality of first vibration damping pads and a plurality of second vibration damping pads, the ageing resistance and the vibration damping performance of the first vibration damping pads are different from those of the second vibration damping pads, and the plurality of first vibration damping pads and the plurality of second vibration damping pads are connected to the outer side of the track slab in an array structure; the first vibration damping pad and the second vibration damping pad can be adhered together to form an intermediate piece, the intermediate piece is of a double-layer laminated structure, and a plurality of intermediate pieces are connected to the outer side of the track slab in an array structure; the track slab comprises a top surface, a bottom surface, a first side surface and a second side surface, wherein the bottom surface, the first side surface and the second side surface are abutted to the ballast bed through the vibration reduction piece, the intermediate piece is arranged on the top surface and the bottom surface, and the first vibration reduction pad and/or the second vibration reduction pad are/is arranged on the first side surface and the second side surface;

a rail connected to the rail plate;

a fastener fastening the rail to the rail plate; and

the buffer assembly is arranged at the gap between the two adjacent sub-track plates and comprises a shape memory buffer pad and a third damping piece, the shape memory buffer pad and the third damping piece are arranged at the gap between the two adjacent sub-track plates, the shape memory buffer pad and the third damping piece are arranged side by side, the shape memory buffer pad is made of nickel-titanium shape memory alloy, and the third damping piece is a shearing metal damper.

According to the shock absorption and isolation floating slab track, the plurality of first shock absorption pads and the plurality of second shock absorption pads are arranged between the track bed and the track slab in an array structure, so that the shock absorption pieces are dispersed into the plurality of independent shock absorption pads to play a role in supporting, shock absorption and isolation, the integral sheet type installation mode of the shock absorption pieces in the traditional structure is improved, the use of materials of the shock absorption pads is reduced, and the installation, adjustment and replacement of the shock absorption pads are facilitated; through setting up the different damping pad of two kinds of durability and damping performance, can rationally arrange the demand that makes up two kinds of damping pads in order to satisfy vibration isolation under the train load effect simultaneously and the shock insulation under the earthquake load effect, application scope is wider, and does benefit to the saving cost.

In one embodiment, the first and second damping pads are in a dot, block or linear structure, so that the first and second damping pads are in any one of a dot array, a block array and a linear array.

In one embodiment, the first vibration reduction pads and the second vibration reduction pads are in any two of a point-shaped structure, a block-shaped structure or a linear structure, so that the first vibration reduction pads and the second vibration reduction pads are arranged in any two of a point-shaped array, a block-shaped array and a linear array.

In one embodiment, the array structure is a circular array, a rectangular array, or an irregular array.

In one embodiment, a reinforcing fiber layer is disposed between the first and second damping pads.

In one embodiment, the first damping pad is made of rubber, and the second damping pad is made of polyurethane.

In one embodiment, the track further comprises a first damping member, and the first damping member is arranged between the track slab and the track bed and/or in the track bed.

In one embodiment, the first damping member is a particle damper, a friction damper, a viscous damper, or an eddy current damper.

In one embodiment, the damping device further comprises a second damping piece, and the second damping piece is hung on the steel rail.

In one embodiment, the second damping member comprises an interconnected mass, spring and damping element, the damping element being connected to the rail.

Drawings

FIG. 1 is a schematic view of a partial structure of a seismic isolation and reduction floating slab track in an embodiment;

FIG. 2 is a schematic view of the combination of the vibration damping member, the sub-track plate, the buffering assembly and the steel rail in the vibration damping and isolating floating slab track shown in FIG. 1;

FIG. 3 is a perspective view of the vibration damping member and the track plate according to an embodiment;

fig. 4 is a combined isometric view of a damping member and a track plate in another embodiment.

Reference numerals: 100. a ballast bed; 200. a track plate; 201. a sub-track plate; 210. a top surface; 220. a bottom surface; 230. a first side surface; 240. a second side surface; 300. a vibration damping member; 301. a middleware; 310. a first vibration damping pad; 320. a second vibration damping pad; 400. a steel rail; 500. a fastener; 501. a first damping member; 600. a second damping member; 800. a buffer assembly; 810. a shape memory cushioning pad; 820. and a third damping member.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 3, an embodiment of a seismic isolation and reduction floating slab track includes a track bed 100, a track slab 200, a damping member 300, a steel rail 400 and a fastener 500, wherein the track slab 200 is disposed on the track bed 100, the damping member 300 is disposed between the track bed 100 and the track slab 200, the steel rail 400 is connected to the track slab 200, and the fastener 500 fastens the steel rail 400 to the track slab 200.

The damping member 300 includes a plurality of first damping pads 310 and a plurality of second damping pads 320, the first damping pads 310 and the second damping pads 320 have different durability and damping performance, and the first damping pads 310 and the second damping pads 320 are connected to the outer side of the track plate 200 in an array structure.

Through arranging a plurality of first damping pad 310 and a plurality of second damping pad 320 between railway roadbed 100 and track board 200 as array structure, make damping piece 300 disperse to a plurality of independent damping pad in order to play support and subtract vibration isolation effect (for example the vibration that the train load arouses down transmits the soil body), also can play to a certain extent and subtract shock insulation (for example the vibration that the earthquake load arouses up transmits the floating plate structure). The integral sheet-shaped installation mode of the damping piece 300 in the traditional structure is improved, the material usage of the damping pad is reduced, and the installation, adjustment and replacement of the damping pad are facilitated; through setting up the damping pad that two kinds of durability and damping performance are different, can rationally arrange the demand of two kinds of damping pads of combination in order to satisfy actual vibration isolation/shock insulation, application scope is wider, and does benefit to practices thrift the cost.

Referring to fig. 3 and 4, the first damping pads 310 and the second damping pads 320 are arranged between the track bed 100 and the track slab 200 in an array structure to isolate the vibration caused by the train load from being transmitted to the track bed or even the soil body, so as to prevent the track slab 200 and the track bed 100 from directly contacting to generate larger vibration and noise when the train travels.

Specifically, in some embodiments, the first damping pad 310 and the second damping pad 320 are each in a dot, block or line structure, such that the plurality of first damping pads 310 and the plurality of second damping pads 320 are in one of a dot array, a block array and a line array.

It should be noted that the dot-shaped structures and the block-shaped structures herein are only different in size, that is, the block size is slightly larger than the dot-shaped size, and the dot-shaped structures and the block-shaped structures include circular, oval, rectangular, square, or other irregular shapes, and the dot-shaped structures and the block-shaped structures are not limited in shape herein. The linear structure includes a long linear shape or a long wave shape.

Here, the array structure may be a circular array, a rectangular array, or other irregular array. The array structure may be formed by alternately arranging a plurality of rows of the first damping pads 310 and a plurality of rows of the second damping pads 320 in sequence, or alternately arranging a single first damping pad 310 and a single second damping pad 320 in sequence. As long as a plurality of first damping pads 310 and a plurality of second damping pads 320 interval set up and scatter, can effectively reduce vibration and fall make an uproar can, concrete arrangement mode can adjust according to actual need.

In other embodiments, the first damping pads 310 and the second damping pads 320 may be in any two of a dot-shaped structure, a block-shaped structure, or a linear structure, so that the plurality of first damping pads 310 and the plurality of second damping pads 320 may be arranged in any two of a dot-shaped array, a block-shaped array, and a linear array.

For example, referring to fig. 4, the first damping pad 310 is a dot structure, the second damping pad 320 is a linear structure, the first damping pads 310 and the second damping pads 320 can be arranged in a dotted-line combination manner, the second damping pads 320 can be disposed at a larger area of the outer side of the track plate 200, the first damping pads 310 can be disposed at corners of the track plate 200 or gaps between the second damping pads 320, so as to facilitate flexible adjustment of the position of the damping member, save material cost for surface support, and effectively damp vibration and reduce noise.

In other embodiments, the first damping pad 310 and the second damping pad 320 may be adhered together to form the intermediate member 301, the intermediate member 301 has a double-layered stacked structure, and a plurality of intermediate members 301 are connected to the outside of the track plate 200 in an array structure.

It can be understood that the double-layered structure can have a better vibration damping effect since the double-layered structure has a greater thickness than the single-layered structure. In a specific embodiment, a reinforcing fiber layer may be further disposed between the first damping pad 310 and the second damping pad 320, so that the first damping pad 310 and the second damping pad 320 may be effectively connected, and the track slab 200 may be effectively supported and the damping and noise reduction performance may be improved.

For example, referring to fig. 2 and 4, the track slab 200 includes a top surface 210, a bottom surface 220, a first side surface 230, and a second side surface 240, wherein the bottom surface 220, the first side surface 230, and the second side surface 240 abut against the track bed 100 via a damping member, the intermediate member 301 is disposed on the top surface 210 and the bottom surface 220, and the first side surface 230 and the second side surface 240 are disposed with a first damping pad 310 and/or a second damping pad 320. Because the bottom surface 220 and the top surface 210 of the track slab 200 are subjected to larger axial pressure, the middle piece 301 has a double-layer structure and can better reduce vibration and noise; the first side 230 and the second side 240 may be provided with damping pads of a single-layer structure or a double-layer structure as required to further damp vibration.

In a specific embodiment, first damping pad 310 material is rubber, second damping pad 320 material is polyurethane, polyurethane damping pad's mechanical strength is high, durability and damping nature are all superior to rubber, polyurethane is difficult to age, wear resistance is good, elasticity is good, hardness is high, resistant oil, resistant solvent, can set up polyurethane pad in the department that receives the pressure great or to the higher section of damping/shake requirement (such as hospital, ancient building or precision instrument laboratory etc.), the department that receives the pressure less or the section that the damping is not high required sets up the rubber pad, rationally adjust first damping pad 310 and second damping pad 320's the mode of arranging, do benefit to improving the life cycle of damping piece 300, reduce the change number of times of damping piece 300. In other embodiments, the first damping pad 310 and the second damping pad 320 may also be made of high-trans isoprene rubber or other high polymer material elastomers.

Referring to fig. 1, the seismic isolation and reduction floating slab track further includes a first damping member 501, and the first damping member is disposed between the track slab 200 and the track bed 100 and/or in the track bed 100.

Specifically, the first damping member 501 is one of a particle damper, a friction damper, a viscous damper or an eddy current damper, and the like, and the first damping member 501 can dissipate vibration energy generated under the action of train load or vertical seismic load so as to improve the vibration attenuation/damping capacity of the overall track structure in the vertical direction.

Referring to fig. 1, the seismic isolation and reduction floating slab track further includes a second damping member 600, and the second damping member 600 is hung on the steel rail 400.

Specifically, the second damping member 600 includes a mass block, a spring, and a damping element (not shown) connected to each other, and the damping element is connected to the rail 400, and when the train generates vibration under a load, the second damping member 600 can transmit the vibration of the rail 400 to the mass block and consume the vibration through the inertial force of the mass block as a reaction force, so that the vibration noise peak of the rail 400 can be effectively suppressed, and a good vibration and noise reduction effect can be obtained in a middle-frequency band and a high-frequency band.

In a specific embodiment, the second damping member 600 is a frequency-modulated dynamic vibration absorber.

Further, referring to fig. 2, the shock absorption and isolation floating slab track further includes a buffer assembly 800, the track slab 200 includes a plurality of sub-track slabs 201, the plurality of sub-track slabs 201 are arranged side by side at intervals, and the buffer assembly 800 is disposed at a gap between two adjacent sub-track slabs 201.

Specifically, the buffering assembly 800 includes a shape memory buffer pad 810 and a third damping member 820, the third damping member 820 is disposed at a gap between two adjacent sub-track plates 201, and the shape memory buffer pad is disposed between the sub-track plates 201 and the third damping member 820. The shape memory cushion 810 and the third damper 820 are disposed side by side, and may have a structure in which they are stacked in the left-right direction or in the up-down direction, for example.

It can be understood that, under the action of strong earthquake, the combination of the shape memory cushion 810 and the third damping member 820 has better ductility to dissipate vibration energy after the structure is deformed, so that the longitudinal stretching deformation of the floating plate under the action of horizontal earthquake load can be better absorbed, and the energy excited by external parts such as horizontal earthquake is prevented from being transmitted to the adjacent sub-track plate 201, thereby greatly reducing the longitudinal deformation and vibration of the whole floating plate structure. The buffer assembly 800 has good elastic performance, and can better absorb the longitudinal expansion deformation of the floating slab under the action of train load or earthquake load and temperature load.

It should be noted that shape memory cushion 810 and third damping member 820 can be two components of the same damper, and the two components need to be assembled together for use. The shape memory cushion 810 and the third damping member 820 may be two separate components, which can be assembled together for use or disassembled for separate use.

In particular embodiments, the third damping member 820 may be a shear-type metal damper that serves as both the original shear hinge connection and provides damping to dissipate energy, such as a mild steel damper. The ability of dissipating external excitation input track structures such as earthquakes and the like by utilizing the inelastic characteristic of the soft steel plate after yielding has the advantages of low yield point, firmness, durability, maintenance-free performance after long-term use and no temperature influence.

In a specific embodiment, the shape memory buffer pad 810 may be a nickel titanium shape memory alloy, which has good superelasticity and shape memory effect, and is installed between the two track slabs 200 to allow the nickel titanium shape memory alloy to generate tensile elastic-plastic deformation along with the vibration of the track structure, so as to consume the vibration energy of the track structure under the action of earthquake or train load, thereby reducing the vibration of the track structure.

Above-mentioned subtract shock insulation floating slab track is array structure arrangement between railway roadbed 100 and track slab 200 through with a plurality of first damping pad 310 and a plurality of second damping pad 320, makes damping piece 300 dispersion for a plurality of independent damping pad in order to play support and subtract vibration isolation effect (the vibration that arouses like the train load down transmits the soil body), also can play to a certain extent and subtract shock insulation (the vibration that arouses like the earthquake load up transmits the floating slab structure). The integral sheet-shaped installation mode of the damping piece 300 in the traditional structure is improved, the material usage of the damping pad is reduced, and the installation, adjustment and replacement of the damping pad are facilitated; by arranging two vibration damping cushions with different durability and vibration damping performance, the two vibration damping cushions can be reasonably arranged and combined to meet the actual vibration isolation/shock insulation requirements, the application range is wider, and the cost is saved; through setting up first damping piece, second damping piece 600 and buffer assembly 800 in the different positions of track, reach good damping and fall make an uproar and three-dimensional shock attenuation and isolation (reduce the energy transmission to the floating plate of vertical and horizontal seismic load) effect.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides an subtract shock insulation floating slab track which characterized in that includes:

a ballast bed;

the vibration damping piece is arranged between the ballast bed and the track slab and comprises a plurality of first vibration damping pads and a plurality of second vibration damping pads, the durability and the vibration damping performance of the first vibration damping pads are different from those of the second vibration damping pads, and the first vibration damping pads and the second vibration damping pads are connected to the outer side of the track slab in an array structure; the first vibration damping pad and the second vibration damping pad can be adhered together to form an intermediate piece, the intermediate piece is of a double-layer laminated structure, and a plurality of intermediate pieces are connected to the outer side of the track slab in an array structure; the track slab comprises a top surface, a bottom surface, a first side surface and a second side surface, wherein the bottom surface, the first side surface and the second side surface are abutted to the ballast bed through the vibration reduction piece, the intermediate piece is arranged on the top surface and the bottom surface, and the first vibration reduction pad and/or the second vibration reduction pad are/is arranged on the first side surface and the second side surface;

a rail connected to the rail plate;

a fastener fastening the rail to the rail plate; and

the buffer assembly is arranged at the gap between the two adjacent sub-track plates and comprises a shape memory buffer pad and a third damping piece, the shape memory buffer pad and the third damping piece are arranged at the gap between the two adjacent sub-track plates and are arranged side by side, the shape memory buffer pad is made of nickel-titanium shape memory alloy, and the third damping piece is a shear type metal damper.

2. The seismic isolation and reduction floating slab track according to claim 1, wherein the first and second damping pads are each in a point-like, block-like or linear configuration such that the plurality of first and second damping pads are in any one of a point-like array, a block-like array and a linear array.

3. The seismic isolation and reduction floating slab track according to claim 1, wherein the first and second damping pads are in any two of a point-like, block-like or linear structure, so that the plurality of first damping pads and the plurality of second damping pads are arranged in any two of a point-like array, a block-like array and a linear array.

4. The seismic isolation and reduction floating plate track according to claim 1, wherein the array structure is a circular array, a rectangular array or an irregular array.

5. The seismic isolation and reduction floating slab track of claim 1, wherein a reinforcing fiber layer is disposed between the first and second damping pads.

6. The seismic isolation and reduction floating slab track according to claim 1, wherein the first damping pad is made of rubber, and the second damping pad is made of polyurethane.

7. The seismic isolation and reduction floating slab track according to claim 1, further comprising a first damping member, wherein the first damping member is arranged between the track slab and the track bed and/or in the track bed.

8. The seismic isolation and reduction floating plate track of claim 7, wherein the first damping member is a particle damper, a friction damper, a viscous damper, or an eddy current damper.

9. The seismic isolation and reduction floating slab track according to claim 1, further comprising a second damping member, wherein the second damping member is hung on the steel rail.

10. The seismic isolation floating deck rail of claim 9, wherein said second damping member comprises a mass, a spring and a damping element connected to said steel rail.