Combined trapezoidal sleeper vibration and noise reduction track system

Abstract

The utility model discloses a combined type trapezoidal sleeper vibration and noise reduction track system which is characterized in that a vibration reduction element and a sound absorption plate made of a porous sound absorption material are arranged on a resonance mass block, and the resonance mass block is mounted on a matched trapezoidal sleeper through a fastening bolt; through the combination of the trapezoidal sleepers and the resonance mass blocks, vibration reduction and noise reduction of the ballast bed are achieved; part of wheel track noise is eliminated through the sound absorption plates, so that noise of the whole track system is reduced, then the resonant frequency of the resonant mass block is adjusted by adjusting the tightness of the bolts, and the vibration reduction performance of the trapezoidal sleeper track system is further improved.

Description

Technical Field

[0001] The utility model belongs to the field of vibration and noise control of rail transportation, and relates to a combined trapezoidal sleeper vibration and noise reduction track system. Background Art

[0002] With the rapid development of urban rail transit, people are paying more and more attention to the vibration of the subway environment caused by wheel-rail interaction. The vibration caused by wheel-rail interaction is transmitted to surrounding infrastructure such as bridges or tunnels through the track structure, and then transmitted to surrounding buildings through the ground. This vibration interference will have adverse effects on schools, hospitals and even residential buildings along the line.

[0003] At present, vibration reduction products are applied in rail transit in different grades (general vibration reduction, medium vibration reduction, advanced vibration reduction and special vibration reduction). Trapezoidal sleepers are widely used vibration reduction products in the field of advanced vibration reduction. Compared with other vibration reduction products, they have excellent vibration reduction effects and obvious structural advantages, fast construction speed and easy maintenance.

[0004] As people's pursuit of a better life increases, the in-car noise of rail transit lines has attracted the attention of passengers, and the in-car noise of the vibration reduction section has become the focus of passenger complaints. The noise generated by the wheel-rail action and the vibration of the vibration-reducing track plate (pillow) are the main aspects of the in-car noise of rail transit. However, the vibration reduction section is mainly used to reduce the vibration of the buildings around the rail transit line, so it has not been designed accordingly for the in-car noise.

[0005] Based on the above problems, the inventors have conducted in-depth research on sound-absorbing panels, resonance blocks, wheel-rail noise sources, and ladder sleeper vibration sources, in the hope of designing a combined trapezoidal sleeper vibration and noise reduction track system that can solve the above problems. Utility Model Content

[0006] In order to overcome the above-mentioned problems, the inventors have conducted intensive research and designed a combined trapezoidal sleeper vibration-damping and noise-reducing track system, in which a vibration-damping element is arranged on the resonant mass block, which is mounted on the matching trapezoidal sleeper by tightening bolts; the vibration and noise reduction of the track bed are achieved by the combination of the trapezoidal sleeper and the resonant mass block; further, a sound-absorbing plate made of a porous sound-absorbing material is installed on the resonant mass block to eliminate part of the wheel-rail noise, thereby reducing the noise of the entire track system, and then the resonant frequency of the resonant mass block is adjusted by adjusting the tightness of the bolts, thereby further improving the vibration-damping performance of the trapezoidal sleeper track system, thereby completing the utility model.

[0007] Specifically, the purpose of the utility model is to provide a combined trapezoidal sleeper vibration and noise reduction track system, the system comprising a trapezoidal sleeper and a resonant mass block 1;

[0008] The trapezoidal sleeper comprises two trapezoidal sleeper longitudinal beams 2, and a groove 21 is provided on the inner top of the trapezoidal sleeper longitudinal beams 2 along the extending direction of the rail.

[0009] The resonant mass block 1 is provided with multiple pieces, and the multiple resonant mass blocks 1 are arranged in parallel between two trapezoidal sleeper longitudinal beams 2; the cross-section of the resonant mass block 1 is T-shaped, and the two sides of the top surface of the resonant mass block 1 respectively extend in the direction of the adjacent trapezoidal sleeper longitudinal beam 2 to form a connecting platform 11, and the resonant mass block 1 is installed between the two trapezoidal sleeper longitudinal beams 2 by mounting the connecting platform 11 on the groove 21.

[0010] An elastic element 12 is further provided between the connecting platform 11 and the groove 21 .

[0011] There is a connecting platform 11 on each side of the resonant mass block 1 connected to the longitudinal beam. Two elastic elements 12 are arranged under each connecting platform 11 . The two elastic elements 12 are respectively located at two ends of the bottom surface of the connecting platform 11 .

[0012] The elastic element 12 is fixed on the bottom surface of the connecting platform 11 .

[0013] A sound absorbing plate 4 is arranged on the top of the resonant mass block 1 , and a connected cavity structure is arranged on the sound absorbing plate to increase the specific surface area of ​​the sound absorbing plate.

[0014] The top surface of the sound absorbing plate 4 and the top surfaces of the trapezoidal sleeper longitudinal beams on both sides thereof are substantially in the same horizontal plane.

[0015] A through hole 13 is provided in the middle of the connecting platform 11, penetrating the sound absorbing plate 4 and the connecting platform 11 vertically.

[0016] An embedded sleeve 22 is provided on the trapezoidal sleeper longitudinal beam 2;

[0017] The resonant mass block 1 is fixed on the trapezoidal sleeper longitudinal beam 2 by passing the bolt 5 through the through hole 13 and then screwed into the embedded sleeve 22 . The resonant frequency of the resonant mass block 1 can be adjusted by adjusting the tightness of the bolt 5 and the trapezoidal sleeper longitudinal beam 2 .

[0018] Among them, a polyurethane vibration reduction component is pasted on the bottom of the trapezoidal sleeper longitudinal beam 2, and a buffer component is pasted on the outer side of the trapezoidal sleeper longitudinal beam 2;

[0019] A connecting steel pipe 6 is connected between the two trapezoidal sleeper longitudinal beams 2;

[0020] The connecting steel pipe 6 is located below the resonant mass block 1 .

[0021] The beneficial effects of the utility model include:

[0022] (1) According to the combined trapezoidal sleeper vibration and noise reduction track system provided by the utility model, the system has the characteristics of "two highs, two adjustments and one reliability", namely, high vibration reduction level, high noise reduction level, adjustable vibration reduction stiffness, adjustable noise reduction frequency, and reliable connection between the ladder sleeper and the resonant mass block.

[0023] (2) According to the combined trapezoidal sleeper vibration and noise reduction track system provided by the utility model, the degree of tightening of the bolts and the trapezoidal sleeper longitudinal beam can be adjusted by bolting the resonant mass block and the trapezoidal sleeper longitudinal beam, so as to achieve the purpose of reducing the noise of vibration sources of different frequencies of vibration and noise;

[0024] (3) According to the combined trapezoidal sleeper vibration and noise reduction track system provided by the utility model, the noise reduction of different frequencies can be achieved by changing the material, porosity and material thickness of the porous sound-absorbing material. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 An exploded view of the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0026] Figure 2 An exploded view of the resonant mass block in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0027] Figure 3 A cross-sectional view of the elastic element in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0028] Figure 4 A cross-sectional view of the bolts in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0029] Figure 5 A schematic diagram showing the three-dimensional structure of the resonant mass block in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0030] Figure 6 A schematic diagram of the front view structure of the resonant mass block in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0031] Figure 7 A schematic diagram of the side view structure of the resonant mass block in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0032] Figure 8 A cross-sectional view of a trapezoidal sleeper in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown;

[0033] Fig. 9 A schematic diagram of the overall structure of a trapezoidal sleeper in the combined trapezoidal sleeper vibration and noise reduction track system of the present application is shown.

[0034] Description of Reference Numerals

[0035] 1-Resonant mass

[0036] 11-Connection Station

[0037] 12-Elastic element

[0038] 13-Through hole

[0039] 2-Ladder sleeper longitudinal beam

[0040] 21-Groove

[0041] 22-Buried casing

[0042] 3-Central ditch

[0043] 4-Sound absorbing board

[0044] 5-Bolt

[0045] 6-Connecting steel pipe DETAILED DESCRIPTION

[0046] The present invention is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more specific.

[0047] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0048] The utility model provides a combined trapezoidal sleeper vibration and noise reduction track system, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in , the system includes a trapezoidal sleeper and a resonant mass block 1;

[0049] The trapezoidal sleeper comprises two trapezoidal sleeper longitudinal beams 2, and a groove 21 is provided on the inner top of the trapezoidal sleeper longitudinal beam 2 along the extending direction of the rail, and the length of the groove is consistent with the length of the sleeper longitudinal beam 2. Fig. 9 As shown in ; the groove is used to provide a limit and space for installing the resonant mass block 1.

[0050] The resonant mass blocks 1 are provided with a plurality of them, and the plurality of resonant mass blocks 1 are arranged in parallel between the two trapezoidal sleeper longitudinal beams 2; the shapes and sizes of the resonant mass blocks 1 are consistent; preferably, 8-20 resonant mass blocks 1 can be arranged between the two trapezoidal sleeper longitudinal beams 2, and more preferably 10 resonant mass blocks are arranged. By splitting the resonant mass block 1 into a plurality of blocks, the mass of a single resonant mass block 1 can be reduced, so as to facilitate the disassembly and lifting of the resonant mass block during the later cleaning and maintenance work.

[0051] The cross-section of the resonant mass block 1 is T-shaped, and both sides of the top surface of the resonant mass block 1 extend toward the direction of the adjacent trapezoidal sleeper longitudinal beam 2 to form a connecting platform 11. By mounting the connecting platform 11 on the groove 21, the resonant mass block 1 can be installed between the two trapezoidal sleeper longitudinal beams 2, located above the central gutter 3, and can be used to replace the traditional gutter cover.

[0052] Preferably, the width dimension of the connecting platform 11 is slightly larger than the width dimension of the groove 21, and the width dimension of the resonant mass block located below the connecting platform 11 is slightly smaller than the minimum distance dimension between the two trapezoidal sleeper longitudinal beams. Through this dimension setting, the resonant mass block can be quickly and stably placed on the two trapezoidal sleeper longitudinal beams.

[0053] Preferably, the resonant mass block can be made of concrete or steel or other materials with high density, that is, the resonant mass block 1 can be a concrete block or a steel block. Mass and stiffness are important factors in changing the resonant frequency of the resonant block, but the mass of the trapezoidal sleeper resonant block as a combined structure cannot be too large, otherwise it will be inconvenient for construction and installation and later operation. In order to reduce the vibration source of different frequency noises generated by the wheel-rail action, the vibration frequency of the resonant block itself can be adjusted by adjusting the tightening effect of the bolts.

[0054] Preferably, the maximum mass of each resonant mass block is 250 kg, which can meet the construction requirements of on-site construction to the greatest extent, while maximizing the overall parametric mass of the trapezoidal sleeper track system, reducing the natural frequency of the entire track system, and thus reducing vibration transmission.

[0055] Preferably, an elastic element 12 is further provided between the connecting platform 11 and the groove 21. The elastic element 12 is provided to absorb the vibration of the resonant mass block 1 and avoid hard contact between the resonant mass block 1 and the trapezoidal sleeper longitudinal beam 2;

[0056] The thickness of the elastic element 12 is such that the top surface of the sound absorbing plate on the resonant mass block 1 is substantially level with the top surfaces of the trapezoidal sleeper longitudinal beams 2 on both sides;

[0057] Preferably, the elastic element may be a polyurethane or rubber vibration damping pad or other mechanical elastic element such as a butterfly spring.

[0058] Preferably, if Figure 5 , Figure 6 , Figure 7 As shown, there is a connecting platform 11 on each side of the resonant mass block 1 connected to the longitudinal beam, and two elastic elements 12 are arranged under each connecting platform 11. The two elastic elements 12 are respectively located at two ends of the bottom surface of the connecting platform 11.

[0059] Preferably, the elastic element 12 is fixed on the bottom surface of the connecting platform 11. The elastic element 12 is preferably rectangular in shape.

[0060] Preferably, a sound absorbing plate 4 is arranged on the top of the resonant mass block 1, and a connected cavity structure is arranged on the sound absorbing plate to increase the specific surface area of ​​the sound absorbing plate.

[0061] Preferably, the size and shape of the sound absorbing plate 4 in the horizontal direction are consistent with the size and shape of the top surface of the resonant mass block 1 .

[0062] The top surface of the sound absorbing plate 4 and the top surfaces of the trapezoidal sleeper longitudinal beams on both sides thereof are substantially in the same horizontal plane.

[0063] The material of the sound absorbing board 4 can be a rigid sound absorbing material such as porous or honeycomb ceramics and ceramsite concrete. This type of sound absorbing material has a connected hollow structure and a large internal specific surface area, which can facilitate the smooth entry of noise sound waves into the pores. Because the internal surface of the pores is rough, the friction and viscosity between the air and the inner wall of the pores are enhanced to convert the noise energy into heat energy stored in the sound absorbing board and consumed, thereby achieving the purpose of efficient noise reduction.

[0064] Preferably, the cross-sectional shape of the channel structure of the porous sound-absorbing material has different geometric shapes according to different production processes and materials, and is not limited to circular, elliptical, quadrilateral, triangle, hexagon or other polygonal shapes.

[0065] The porous sound-absorbing material can be specifically designed according to the noise spectrum characteristics of the ladder sleeper laying sections of different lines, and the noise reduction requirements of different driving conditions and line conditions can be met by designing the pore size, porosity and material thickness of the sound-absorbing material.

[0066] After the porous sound-absorbing material has been used for a period of time, it can be backwashed with high-pressure gas or liquid to eliminate blockage of pores by external dust, and the operation is simple and convenient.

[0067] Preferably, a through hole 13 is provided in the middle of the connecting platform 11, which passes through the sound absorbing plate 4 and the connecting platform 11 vertically.

[0068] A pre-buried sleeve 22 is provided on the trapezoidal sleeper longitudinal beam 2. Figure 8 As shown in;

[0069] The resonant mass block 1 is fixed on the trapezoidal sleeper longitudinal beam 2 by passing the bolt 5 through the through hole 13 and then screwed into the embedded sleeve 22. The resonant mass block 1 can be connected to the embedded sleeve reserved in the trapezoidal sleeper longitudinal beam by the bolt, thereby limiting the longitudinal displacement of the resonant mass block 1 along the horizontal direction of the track.

[0070] The detachable installation of the bolt 5 allows the resonant mass block to be quickly disassembled and assembled, making it convenient to clean and maintain the central ditch.

[0071] In addition, the resonant frequency of the resonant mass block 1 can be adjusted by adjusting the degree of tightening of the bolts 5 and the trapezoidal sleeper longitudinal beam 2. The vibration frequency adapted by the resonant mass block 1 can be adjusted by adjusting the degree of tightening, so as to achieve the purpose of reducing the vibration sources of vibration and noise of different frequencies.

[0072] In this application, according to the formula The overall resonant frequency of the resonant mass block can be changed by adjusting the elastic coefficient of the resonant mass block or the elastic element; adjusting the tightness of the bolts is essentially adjusting the elastic coefficient k of the elastic element. This measure aims to change the inherent resonant frequency of the resonant mass block, thereby achieving a more ideal resonance effect and improving the performance of the overall system.

[0073] Preferably, the through hole 13 on the resonant mass block can also serve as a hoisting hole, which is convenient for on-site construction and hoisting, and greatly improves the work efficiency of construction workers.

[0074] A high-grade polyurethane vibration-damping component is pasted on the bottom of the trapezoidal sleeper longitudinal beam 2, and a buffer component is pasted on the outer side of the trapezoidal sleeper longitudinal beam 2, forming a mass spring system to play a vibration-damping role.

[0075] A connecting steel pipe 6 is connected between the two trapezoidal sleeper longitudinal beams 2;

[0076] The connecting steel pipe 6 is located below the resonant mass block 1 .

[0077] The combined trapezoidal sleeper is composed of a trapezoidal sleeper and a resonant mass block. The noise sources generated by the wheel-rail action include the vehicle body noise itself, the high-frequency wheel-rail action noise, and the low-frequency noise generated by the track plate. The combined trapezoidal sleeper vibration reduction and noise reduction track system provided in the present application further improves the vibration reduction of the trapezoidal sleeper by absorbing and consuming part of the vibration energy generated by the trapezoidal sleeper track system in the low-frequency range due to the wheel-rail action through the resonant mass block, and can reduce the noise generated by the low-frequency vibration of the trapezoidal sleeper track system. The resonant mass block generates a reaction force with an opposite force phase to the trapezoidal sleeper, so it can consume the vibration energy transmitted by the trapezoidal sleeper. The sound-absorbing panel installed on the resonant mass block can greatly reduce the high-frequency wheel-rail action noise. Based on this, the combined trapezoidal sleeper vibration reduction and noise reduction track system provided in the present application can have both the functions of vibration reduction of buildings around rail transit and noise reduction in the rail transit body.

[0078] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. A combined trapezoidal sleeper vibration and noise reduction track system, characterized in that: The system comprises a trapezoidal sleeper and a resonant mass block (1); The trapezoidal sleeper comprises two trapezoidal sleeper longitudinal beams (2), and a groove (21) is provided on the inner top of the trapezoidal sleeper longitudinal beams (2) along the extending direction of the rail. A plurality of resonant mass blocks (1) are arranged between two trapezoidal sleeper longitudinal beams (2); both sides of the top surface of the resonant mass block (1) respectively extend in the direction of the adjacent trapezoidal sleeper longitudinal beam (2) to form a connecting platform (11); and the resonant mass block (1) is installed between the two trapezoidal sleeper longitudinal beams (2) by mounting the connecting platform (11) on the groove (21).

2. The combined trapezoidal sleeper vibration and noise reduction track system according to claim 1, characterized in that: An elastic element (12) is also provided between the connecting platform (11) and the groove (21).

3. The combined trapezoidal sleeper vibration and noise reduction track system according to claim 2, characterized in that: A connecting platform (11) is provided on each side of the resonant mass block (1) connected to the longitudinal beam, and two elastic elements (12) are arranged under each connecting platform (11). The two elastic elements (12) are respectively located at two ends of the bottom surface of the connecting platform (11).

4. The combined trapezoidal sleeper vibration and noise reduction track system according to claim 3, characterized in that: The elastic element (12) is fixed to the bottom surface of the connecting platform (11).

5. The combined trapezoidal sleeper vibration and noise reduction track system according to claim 1, characterized in that: A sound absorbing plate (4) is arranged on the top of the resonant mass block (1), and a connected cavity structure is arranged on the sound absorbing plate to increase the specific surface area of ​​the sound absorbing plate.

6. The combined trapezoidal sleeper vibration and noise reduction track system according to claim 5, characterized in that: The top surface of the sound absorbing plate (4) and the top surfaces of the trapezoidal sleeper longitudinal beams on both sides thereof are substantially in the same horizontal plane.

7. The combined trapezoidal sleeper vibration and noise reduction track system according to claim 3, characterized in that: A through hole (13) is provided in the middle of the connecting platform (11) and passes through the sound absorbing plate (4) and the connecting platform (11) vertically. A pre-buried sleeve (22) is provided on the trapezoidal sleeper longitudinal beam (2); The resonant mass block (1) is fixed on the trapezoidal sleeper longitudinal beam (2) by passing a bolt (5) through a through hole (13) and then being screwed into the embedded sleeve (22), and the resonant frequency of the resonant mass block (1) can be adjusted by adjusting the degree of tightening of the bolt (5) and the trapezoidal sleeper longitudinal beam (2).

8. The combined trapezoidal sleeper vibration and noise reduction track system according to claim 1, characterized in that: A polyurethane vibration-damping pad is pasted on the bottom of the trapezoidal sleeper longitudinal beam (2), and a buffer component is pasted on the outer side surface of the trapezoidal sleeper longitudinal beam (2); A connecting steel pipe (6) is connected between the two trapezoidal sleeper longitudinal beams (2); The connecting steel pipe (6) is located below the resonant mass block (1).

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