Anti-instability floating slab track vibration isolation system

Abstract

The invention relates to the technical field of track vibration isolation, in particular to an anti-instability floating slab track vibration isolation system which comprises an anti-instability vibration isolation device, a floating slab track bed and a backfill layer. The anti-instability device is positioned between the floating slab ballast bed and the backfill layer; four anti-instability vibration isolation devices are arranged at the bottom of each floating slab track bed; each anti-instability vibration isolation device is composed of a pressing elastic piece, four abutting pieces, four springs, a vibration isolation steel ring and a bottom plate. The downward pressing elastic piece is a quadrangular frustum pyramid with a large upper bottom and a small lower bottom; the abutting piece is a cylinder with the section in a right trapezoid shape. The vibration isolation steel ring comprises a steel wire rope ring and clamping plates on the upper side and the lower side. The four abutting pieces are connected with the bottom plate in a sliding mode and arranged in a circumferential array mode. And the other side faces of the four abutting pieces abut against the four springs correspondingly, the other ends of the four springs abut against the inner walls of the prefabricated concave tables of the backfill layer correspondingly, out-of-plane instability can be effectively prevented, and meanwhile the good vibration isolation effect can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of track vibration isolation, in particular to an anti-instability floating plate track vibration isolation system. Background Art

[0002] As the mainstream vibration reduction measure for track structures, floating slab trackbeds usually have spring isolators between the floating slab and the main structure. Their excellent vibration isolation performance has been verified. However, the existing spring isolators for floating slab trackbeds are simple in structure and single in function. Their vibration isolation effect is only for vertical vibrations. Track operation is often accompanied by three-dimensional vibrations, especially in special locations such as turns, which will also produce impact loads on the floating slab trackbed, posing the risk of out-of-plane instability of the spring isolators. Although the stability of the isolators can be increased by connecting multiple springs in parallel, this will also cause the vertical stiffness of the isolators to be too large, thus affecting the vibration isolation effect, making it difficult to strike a balance between stability and performance. In summary, based on the shortcomings of the existing floating slab trackbed vibration isolation measures, there is a need for a new floating slab track vibration isolation system that can effectively prevent out-of-plane instability while ensuring good vibration isolation effects. Summary of the invention

[0003] The purpose of the present application is to provide an anti-instability floating slab track vibration isolation system, aiming to solve the problems in the prior art.

[0004] The embodiment of the present application provides an anti-instability floating plate track vibration isolation system, comprising an anti-instability vibration isolation device, a floating plate track bed and a backfill layer; tracks are laid in sequence along the floating plate track bed in the direction of the route; the anti-instability device is located between the floating plate track bed and the backfill layer; a prefabricated concave platform is provided on the top surface of the backfill layer; the anti-instability vibration isolation device is installed in the prefabricated concave platform; four anti-instability vibration isolation devices are provided at the bottom of each floating plate track bed; a single anti-instability vibration isolation device is composed of a downward pressing elastic member, four supporting members, four springs, an isolation member, and a plurality of springs. The prefabricated recessed platform is composed of a vibration steel ring and a bottom plate; the downward-pressing elastic member is a quadrangular platform with a larger upper bottom and a smaller lower bottom; the supporting member is a column with a right-angled trapezoidal cross section; the vibration-isolating steel ring includes a wire rope ring and clamps on the upper and lower sides; the bottom plate is fixed to the bottom surface of the prefabricated recessed platform; the four supporting members are slidably connected to the bottom plate and are arranged in a circular array; the inclined surfaces of the four supporting members are respectively fitted with the four inclined surfaces of the downward-pressing elastic member; the other side surfaces of the four supporting members are respectively pressed against four springs, and the other ends of the four springs are respectively pressed against the inner wall of the prefabricated recessed platform of the backfill layer.

[0005] Furthermore, the upper top plate of the downward-pressing elastic member is fastened to the bottom surface of the floating plate track bed by bolts.

[0006] Furthermore, the bottom plate is a cubic steel plate; four sliding blocks in a circular array and with a trapezoidal cross section are welded on the top surface of the bottom plate; and the four supporting members are respectively cut with sliding grooves corresponding to the sliding blocks on the bottom surfaces.

[0007] Furthermore, the sizes of the sliding block and the sliding groove of the supporting member match each other; the four supporting members are positioned and slidably arranged by the sliding block and the sliding groove respectively.

[0008] Furthermore, the wire rope loop is a closed loop formed by kneading a number of steel strands together; the upper and lower ends of the wire rope loop are fixed between the clamping plates, and the number of the wire rope loops can be determined according to engineering requirements.

[0009] Furthermore, the clamping plate is divided into an upper clamping plate and a lower clamping plate; the lower clamping plate is fixed to the middle part of the bottom plate by bolts; and the upper clamping plate is fixed to the lower bottom surface of the downward pressure elastic member by bolts.

[0010] Furthermore, the clamp is composed of a steel plate and a clamp protruding from the steel plate; the clamp has an opening for a wire rope ring to pass through; and a bolt hole is provided at the center of the steel plate.

[0011] The beneficial effects of the present invention are as follows: four springs and four supporting members arranged in a circular array support the downward-pressing elastic member through an inclined surface and provide resistance, thereby providing a stable force environment for the floating slab track bed; no matter the vibrations of the floating slab track bed are subjected to vertical, longitudinal, transverse or multi-directional coupling during track operation, they can be converted into axial pressure of the spring through the interaction between the downward-pressing elastic member and the supporting member, thereby preventing the spring from becoming unstable out of the plane; at the same time, the vibration isolation system can effectively consume energy, whether it is the inclined friction between the downward-pressing elastic member and the supporting member or the friction between the steel strands inside the wire rope ring, thereby preventing the kinetic energy of the track operation from being transmitted to the main structure of the tunnel through the backfill layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 It is a side schematic diagram of the overall structure of the present invention;

[0014] Figure 3 It is a top view of the anti-instability vibration isolation device in the present invention;

[0015] Figure 4 It is a structural schematic diagram of the bottom plate of the present invention;

[0016] Figure 5 It is a schematic diagram of the supporting member of the anti-instability vibration isolation device in the present invention;

[0017] Figure 6 It is a schematic diagram of the structure of the vibration isolation steel ring in the present invention;

[0018] Figure 7 This is a schematic diagram of the overall structure of the present invention when it is under pressure;

[0019] Figure 8 It is a side schematic diagram of the overall structure of the present invention when under pressure.

[0020] In the figure:

[0021] 1. Anti-instability vibration isolation device; 11. Downward pressure elastic member; 12. Support member; 121. Sliding groove; 13. Spring; 14. Vibration isolation steel ring; 141. Wire rope ring; 142. Upper clamping plate; 143. Lower clamping plate; 145. Bolt hole; 146. Clamp; 15. Bottom plate; 151. Sliding block; 2. Floating plate ballast bed; 3. Backfill layer; 31. Prefabricated concave platform. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figures 1 to 6The anti-instability floating plate track vibration isolation system shown in the figure comprises an anti-instability vibration isolation device 1, a floating plate track bed 2 and a backfill layer 3; railway tracks are laid in sequence on the floating plate track bed 2 along the direction of the route; the anti-instability device 1 is located between the floating plate track bed 2 and the backfill layer 3; a prefabricated recess 31 is provided on the top surface of the backfill layer 3; the anti-instability vibration isolation device 1 is installed in the prefabricated recess 31; four anti-instability vibration isolation devices 1 are provided at the bottom of each floating plate track bed 2; a single anti-instability vibration isolation device 1 is composed of a downward pressure elastic member 11, four supporting members 12, four springs 13, a vibration isolation steel ring 14 and a bottom plate 15; the downward pressure elastic member 11 is a four-sided pyramid with a larger upper bottom and a smaller lower bottom; the supporting member 12 is a column with a right-angled trapezoidal cross-section; the vibration isolation steel ring 14 includes a wire rope ring 141 and clamping plates on upper and lower sides ; The bottom plate 15 is fixed on the bottom surface of the prefabricated recess 31; the four supporting members 12 are slidably connected to the bottom plate 15 and are arranged in a circular array; the inclined surfaces of the four supporting members 12 are respectively fitted with the four inclined surfaces of the downward-pressing elastic member 11; the other side surfaces of the four supporting members 12 are respectively pressed against the ends of the four springs 13, and the other ends of the four springs 13 are respectively pressed against the inner wall of the prefabricated recess 31 of the backfill layer 3, and the four springs 13 and the four supporting members 12 arranged in a circular array support the downward-pressing elastic member 11 through the inclined surfaces and provide resistance; when the downward-pressing elastic member 11 squeezes the supporting member 12, the supporting members 12 and the springs 13 arranged in a circular array will provide the downward-pressing elastic member 11 with a balanced force environment formed by a group of resistances of the same size and opposite directions, which can effectively prevent the occurrence of out-of-plane instability caused by longitudinal and lateral impacts.

[0024] The upper top plate of the downward-pressing elastic member 11 is fastened to the bottom surface of the floating plate ballast 2 by bolts.

[0025] The bottom plate 15 is a cubic steel plate; four sliding blocks 151 in a circular array and with a trapezoidal cross section are welded on the top surface of the bottom plate 15; and the four supporting members 12 are respectively cut with sliding grooves 121 corresponding to the sliding blocks 151 on the bottom surface.

[0026] The sizes of the slider 151 and the sliding groove 121 of the support member 12 are used in coordination with each other; the four support members 12 are positioned and slidably arranged by the slider 151 and the sliding groove 121 respectively, so that the support members 12 slide relative to the bottom plate 15 along the sliding groove 121.

[0027] The wire rope ring 141 is a closed loop formed by kneading a number of steel strands together; the upper and lower ends of the wire rope ring 141 are fixed between the clamping plates, and the number of the wire rope rings 141 can be determined according to engineering requirements.

[0028] The clamping plate is divided into an upper clamping plate 142 and a lower clamping plate 143; the lower clamping plate 143 is fixed to the middle of the bottom plate 15 by bolts; the upper clamping plate 142 is fixed to the lower bottom surface of the downward pressing elastic member 11 by bolts.

[0029] The clamping plate is composed of a steel plate and a clamp 146 protruding from the steel plate; the clamp 146 has an opening for the wire rope ring 141 to pass through; and a bolt hole 145 is provided in the center of the steel plate.

[0030] like Figure 6 As shown, the wire rope ring 141 is a ring formed by kneading a number of steel strands together, and the upper and lower sections of the wire rope ring 141 respectively pass through the rectangular clamps 146 protruding from the clamps on both sides, and the rectangular clamps 146 have openings for the wire rope ring 141 to pass through, and the steel plates of the clamps have bolt holes 146 for bolts to pass through. The middle position of the bottom plate 15 is also provided with bolt holes for bolts to pass through, and the positions of the bolt holes of the bottom plate 15 and the lower clamp 143 match, and are fixed by bolts; similarly, the lower bottom surface of the pressing elastic member 11 is also provided with bolt holes, and the bolt holes of the pressing elastic member 11 and the upper clamp 142 match, and are fixed by bolts. The number of wire rope rings 141 can be determined according to the load-bearing, energy consumption and vibration isolation requirements of the project, and the number of protruding clamps on the clamps needs to correspond thereto.

[0031] like Figure 7 and Figure 8 As shown, when the vibration caused by track operation forces the floating slab track bed 2 to undergo vertical displacement, the floating slab track bed 2 drives the downward-pressing elastic member 11 of the anti-instability vibration isolation device 1 to move downward synchronously, and the downward-pressing elastic member 11 squeezes the inclined surfaces of the corresponding supporting members 12 through the inclined surfaces on the four sides, forcing the four supporting members 12 to undergo outward radial displacement along the slideway of the bottom plate 15, and the four springs 13 are squeezed and contracted by the corresponding supporting members 12, and the downward-pressing elastic member 11 drives the vibration isolation steel ring 14 to enter a compressed working state while moving downward. At this stage, the time lag effect caused by the nonlinear mechanical properties of the wire rope ring 141 and the energy consumption effect formed by the mutual friction between the steel strands can effectively enhance the vibration isolation effect. At the same time, the elastic restoring force provided by the spring 13 prompts the supporting member 12 to squeeze the downward-pressing elastic member 11 through the inclined surface to drive the floating slab track bed 2 to return to its original position, thereby achieving reciprocating vibration isolation of the floating slab track bed during the track operation stage.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A floating slab track vibration isolation system for preventing instability, characterized in that: It comprises an anti-instability vibration isolation device, a floating plate ballast and a backfill layer; tracks are laid in sequence on the floating plate ballast in the direction of the route; the anti-instability device is located between the floating plate ballast and the backfill layer; a prefabricated concave platform is provided on the top surface of the backfill layer; the anti-instability vibration isolation device is installed in the prefabricated concave platform; four anti-instability vibration isolation devices are provided at the bottom of each floating plate ballast; a single anti-instability vibration isolation device is composed of a downward pressing elastic member, four supporting members, four springs, a vibration isolation steel ring and a bottom plate; the bottom The compression elastic member is a quadrangular pyramid with a larger upper base and a smaller lower base; the supporting member is a column with a right-angled trapezoidal cross-section; the vibration isolation steel ring includes a wire rope ring and clamping plates on the upper and lower sides; the bottom plate is fixed to the bottom surface of the prefabricated concave platform; the four supporting members are slidably connected to the bottom plate and are arranged in a circular array; the inclined surfaces of the four supporting members are respectively fitted with the four inclined surfaces of the downward compression elastic member; the other side surfaces of the four supporting members are respectively pressed against four springs, and the other ends of the four springs are respectively pressed against the inner wall of the prefabricated concave platform of the backfill layer.

2. The anti-instability floating slab track vibration isolation system according to claim 1, characterized in that: The upper top plate of the downward-pressing elastic member is fastened to the bottom surface of the floating plate ballast bed by bolts.

3. The anti-instability floating slab track vibration isolation system according to claim 1, characterized in that: The bottom plate is a cubic steel plate; four sliding blocks in a circular array and with a trapezoidal cross section are welded on the top surface of the bottom plate; and sliding grooves corresponding to the sliding blocks are cut on the bottom surfaces of the four supporting members respectively.

4. The anti-instability floating slab track vibration isolation system according to claim 3 is characterized in that: The sizes of the sliding block and the sliding groove of the supporting member match each other; the four supporting members are positioned and slidably arranged through the sliding block and the sliding groove respectively.

5. The anti-instability floating slab track vibration isolation system according to claim 1, characterized in that: The wire rope loop is a closed loop formed by kneading a number of steel strands together; the upper and lower ends of the wire rope loop are fixed between clamping plates, and the number of the wire rope loops can be determined according to engineering requirements.

6. The anti-instability floating slab track vibration isolation system according to claim 5, characterized in that: The clamping plate is divided into an upper clamping plate and a lower clamping plate; the lower clamping plate is fixed to the middle part of the bottom plate by bolts; and the upper clamping plate is fixed to the lower bottom surface of the downward pressing elastic member by bolts.

7. The anti-instability floating slab track vibration isolation system according to claim 6, characterized in that: The clamp is composed of a steel plate and a clamp protruding from the steel plate; the clamp is provided with an opening for a wire rope ring to pass through; and a bolt hole is provided at the center of the steel plate.

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