Mute high-vibration-reduction ballast bed unit structure and mute high-vibration-reduction ballast bed

Abstract

The invention discloses a mute high-vibration-reduction ballast bed unit structure and a mute high-vibration-reduction ballast bed. The unit structure comprises two longitudinal pillows (1), two constraint damping vibration reduction structures (2), a plurality of special-shaped I-shaped steel transverse connecting structures (3), a limiting groove (4) and a limiting boss (5). The plurality of special-shaped I-shaped steel transverse connecting structures (3) are connected between the two longitudinal pillows (1), so that a main body structure of the mute high-vibration-reduction road bed unit structure is formed; the two constraint damping vibration attenuation structures (2) respectively cover the outer side wall, the bottom and about 1 / 3 of the inner side wall from bottom to top of one longitudinal beam (1); one end of each longitudinal beam (1) is provided with the corresponding limiting groove (4), and the other end of each longitudinal beam (1) is provided with the corresponding limiting boss (5) matched with the corresponding limiting groove (4); a first macromolecule elastic layer (42) is attached to a groove opening (41) of the limiting groove (4).

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, and more specifically to a quiet, high-grade vibration-damping track bed unit structure and a quiet, high-grade vibration-damping track bed. Background Technology

[0002] With the rapid development of urban rail transit, while alleviating urban traffic pressure, it has also brought about vibration and noise pollution. Different vibration isolation measures are often required depending on the degree of impact of vibration and noise on sensitive areas. Using vibration-damping tracks is one common method. However, regardless of the type of vibration-damping track used, vibration energy is concentrated in the track section, which increases wheel-rail vibration and in-vehicle noise, affecting passenger comfort.

[0003] In recent years, the use of advanced vibration-damping track beds, especially those employing prestressed reinforced concrete with polyurethane vibration-damping pads at the bottom and flat steel beams in the middle, has been increasing. This type of track bed uses very little steel reinforcement and has a small concrete volume, resulting in a small vibrating mass and limited internal damping effect of the vibration isolation elements. This leads to significant wheel-rail impact vibration and noise, affecting passenger comfort. Furthermore, some existing advanced vibration-damping track beds have unsatisfactory sound insulation and vibration reduction effects, especially in tunnels. Due to the limited space and poor air circulation, reverberation easily occurs, transmitting noise into the train and affecting passenger comfort. It also has a certain impact on the living environment of surrounding residents.

[0004] Therefore, new track bed vibration reduction technologies and equipment are needed to at least partially eliminate the problems existing in the current technology. Summary of the Invention

[0005] This invention addresses the aforementioned shortcomings in the prior art by providing a quiet, high-level vibration-damping track bed unit structure and a quiet, high-level vibration-damping track bed. The main structure adopts a constrained damping structure, which is a sandwich structure of "rigid constraint + viscoelastic shear + rigid constraint". This structure can achieve efficient vibration suppression under the premise of lightweighting and noise reduction in engineering systems.

[0006] More specifically, according to one aspect of the present invention, a quiet high-level vibration-damping track bed unit structure is provided, comprising: two longitudinal pillows (1), two constraint damping vibration-damping structures (2), multiple irregular I-beam transverse connection structures (3), limiting grooves (4), and limiting bosses (5);

[0007] Among them, the multiple irregular I-beam transverse connection structures (3) are connected between two longitudinal sleepers (1), thereby forming the main structure of the silent high-level vibration reduction track bed unit structure;

[0008] Two constrained damping vibration reduction structures (2) are respectively wrapped around the outer side wall, bottom and about 1 / 3 of the inner side wall from bottom to top of a longitudinal beam (1);

[0009] Each longitudinal beam (1) has a limiting groove (4) at one end and a limiting boss (5) that cooperates with the limiting groove (4) at the other end;

[0010] A first polymer elastic layer (42) is attached to the groove (41) of the limiting groove (4).

[0011] According to an embodiment of the present invention, the transverse connection structure (3) of the irregular I-beam is composed of an irregular I-beam with a small upper cross section and a large lower cross section.

[0012] According to an embodiment of the present invention, the plurality of irregular I-beam transverse connecting structures (3) are integrally formed with two longitudinal pillows (1).

[0013] According to an embodiment of the present invention, the silent high-level vibration reduction track bed unit structure further includes a base (7), and two longitudinal pillows (1) are arranged in the base (7). The bottom surface and outer side wall of each longitudinal pillow (1) are in contact with the base (7) through a constraint damping vibration reduction structure (2).

[0014] According to an embodiment of the present invention, the silent high-level vibration reduction track bed unit structure further includes a cover plate (6) laid between two irregular I-beam transverse connecting structures (3), the top of the cover plate (6) being substantially flush with the upper surface of the longitudinal beam (1).

[0015] According to an embodiment of the present invention, the cover plate (6) is a TMD tunable dynamic vibration damping cover plate, which is composed of a cavity and a top plate, and the cavity is filled with damping vibration absorbing material.

[0016] According to an embodiment of the present invention, the constraint damping vibration reduction structure (2) includes a second polymer elastic material layer (21) and a non-metallic constraint layer (22), wherein the second polymer elastic material layer (21) is combined with the longitudinal pillow (1).

[0017] According to an embodiment of the present invention, the polymeric elastic material is selected from rubber and polyurethane.

[0018] According to an embodiment of the present invention, the non-metallic constraint layer (22) has a smooth surface and is made of a non-metallic thin-film material selected from rigid engineering plastics, photocurable resins, fiberglass sheets or carbon fibers.

[0019] According to another aspect of the present invention, a quiet high-grade vibration-damping track bed is provided, comprising a plurality of quiet high-grade vibration-damping track bed unit structures described in the present invention, which are spliced ​​end to end by limiting grooves (4) and limiting bosses (5).

[0020] Compared with existing technologies, the design of this invention achieves beneficial technical effects. For example, the main structure of the quiet high-level vibration-damping track bed adopts constrained damping to cover the longitudinal sleepers for vibration isolation and sound absorption, and the middle adopts multiple sets of irregularly shaped I-beams for transverse connection structure to improve the transverse bending section modulus of the track bed. This makes it possible for: ① the constrained damping vibration-damping structure to achieve good vibration isolation and sound absorption, reduce sound radiation, and achieve quiet vibration isolation; ② the irregularly shaped I-beams for transverse connection structure to increase the transverse bending section modulus of the track bed, effectively improving the dynamic response of wheel-rail impact vibration, etc. Attached Figure Description

[0021] Figure 1 A three-dimensional structural diagram of a silent high-level vibration-damping track bed unit structure according to an embodiment of the present invention;

[0022] Figure 2 A three-dimensional structural diagram of a silent high-level vibration-damping track bed unit structure including a cover plate according to an embodiment of the present invention;

[0023] Figure 3 for Figure 1 The cross-sectional view of the silent high-level vibration-damping track bed unit structure (including the base) is shown;

[0024] Figure 4 for Figure 2 The cross-sectional view of the silent high-level vibration-damping track bed unit structure (including the base) is shown;

[0025] Figure 5 This is a schematic diagram of the transverse connection structure of the irregular I-beams in the silent high-level vibration-damping track bed unit structure according to an embodiment of the present invention;

[0026] Figure 6 A three-dimensional structural schematic diagram of a silent high-level vibration-damping track bed (including the base) according to an embodiment of the present invention; and

[0027] Figure 7 This is a three-dimensional structural diagram of a silent high-level vibration-damping track bed (including a base and a cover plate) according to an embodiment of the present invention. Detailed Implementation

[0028] The present invention can be better understood from the accompanying drawings and the following embodiments. However, those skilled in the art will readily understand that the descriptions in the embodiments are for illustrative purposes only and should not, and will not, limit the scope of the invention.

[0029] Figure 1 A three-dimensional structural diagram of a silent high-level vibration-damping track bed unit structure according to an embodiment of the present invention; Figure 3 for Figure 1 The diagram shows a cross-sectional view of the silent high-level vibration-damping track bed unit structure (including the base).

[0030] Referring to the accompanying drawings, the quiet, high-grade vibration-damping track bed unit structure of the embodiment may include two longitudinal sleepers (1), two constraint damping vibration reduction structures (2), multiple irregularly shaped I-beam transverse connection structures (3), limiting grooves (4), limiting bosses (5), and a base (7); wherein, the multiple irregularly shaped I-beam transverse connection structures (3) are connected between the two longitudinal sleepers (1), thereby forming the main structure of the quiet, high-grade vibration-damping track bed unit structure. The various components are further described in detail below with reference to the accompanying drawings.

[0031] As shown in the figure, two longitudinal sleepers (1) are spaced apart and are used to support rails (not shown). The longitudinal sleepers (1) can be formed by casting reinforced concrete. A limiting groove (4) is formed at one end of the longitudinal sleeper (1), and a limiting boss (5) is formed at the other end. The limiting boss (5) can be inserted into the limiting groove (4) of the other longitudinal sleeper, thereby achieving mutual cooperation.

[0032] The limiting groove (4) and limiting boss (5) can be cast together with the longitudinal pillow (1) in an integrated manner, for example, by using a steel reinforcement model and concrete to form an integrated casting.

[0033] To prevent hard contact between the longitudinal pillows (1), a first polymer elastic layer (42) can be formed in the groove (41) of the limiting groove (4). For example, a polymer elastic layer such as polyurethane or rubber can be coated on the inner surface of the groove (41) to prevent hard contact and reduce vibration.

[0034] Multiple irregularly shaped I-beam transverse connection structures (3) are set between two longitudinal sleepers (1). Figure 5 This is a schematic diagram of the transverse connection structure of the irregularly shaped I-beams in the silent high-level vibration-damping track bed unit structure according to an embodiment of the present invention. Figure 5 As shown, the irregular H-beam transverse connection structure (3) has a shape with a small upper section and a large lower section. This structure increases the transverse bending section modulus of the track bed, which can improve the dynamic response to wheel-rail impact vibration. More specifically, this structure can be made of irregular H-beams. The irregular H-beam transverse connection structure (3) can be integrally formed with two longitudinal beams (1). For example, the two ends of the irregular H-beam transverse connection structure (3) are fixed to the longitudinal beams (1), for example, by fixing with a steel reinforcement mold, and then integrally cast. Four irregular H-beam transverse connection structures (3) are shown in the figure. It should be understood that the number of irregular H-beam transverse connection structures (3) can be appropriately set according to actual needs.

[0035] Each longitudinal beam (1) is equipped with its own constrained damping structure (2). The constrained damping structure (2) covers the outer wall, bottom, and approximately one-third of the inner wall from bottom to top of the longitudinal beam (1), such as... Figure 1 and 3As shown. The constrained damping vibration reduction structure (2) includes a second polymer elastic material layer (21) and a non-metallic constraint layer (22). The polymer elastic material can be, for example, rubber, polyurethane, etc. The non-metallic constraint layer (22) has a smooth surface and can be made of a non-metallic thin-layer material selected from rigid engineering plastics, photocurable resins, fiberglass sheets, or carbon fibers. The second polymer elastic material layer (21) and the non-metallic constraint layer (22) can be bonded together by means of adhesive bonding, pressing, etc.

[0036] The second polymer elastic material layer (21) is combined with the longitudinal pillow (1), for example, they can be bonded together. This forms a sandwich structure, with the second polymer elastic material layer (21) as the middle layer, the longitudinal pillow (1) as the inner constraint layer, and the non-metallic constraint layer (22) as the outer constraint layer. This structure can achieve good vibration isolation and sound absorption without increasing the cross-sectional size of the track bed, and its sound radiation is smaller than other vibration reduction structures, so it can be called a silent vibration reduction product.

[0037] Figure 2 A three-dimensional structural diagram of a silent high-level vibration-damping track bed unit structure including a cover plate according to an embodiment of the present invention; Figure 4 for Figure 2 The diagram shows a cross-sectional view of the silent high-level vibration-damping track bed unit structure (including the base). For ease of operation and maintenance, a silent cover plate (6) can be installed between the two irregular I-beam transverse connection structures (3). For example, the two ends of the silent cover plate (6) can be fixed with bolts and overlapped on the upper wings of the two irregular I-beam transverse connection structures (3). For example, the cover plate (6) can be a TMD tunable dynamic vibration-absorbing damping cover plate, consisting of a cavity (61) and a top plate (62), with damping vibration-absorbing material (63) inside the cavity; the vibration-absorbing material can be a fluid, semi-fluid damping material, or particle damping, etc. The installation of the silent cover plate (6) has a certain sound absorption effect and facilitates the movement of maintenance personnel.

[0038] According to an embodiment of the present invention, the silent high-grade vibration-damping track bed unit structure may further include a base (7), and two longitudinal pillows (1) are disposed in the base (7). Figure 3 and 4 As shown, the base (7) is semi-enclosed, enclosing two longitudinal pillows (1). The bottom surface and outer wall of each longitudinal pillow (1) are in contact with the base (7) through a constraint damping structure (2). For example, the constraint damping structure (2) is in smooth contact with the side wall of the base (7), which can effectively limit the lateral movement.

[0039] Figure 6 This is a three-dimensional structural diagram of a silent high-level vibration-damping track bed (including the base) according to an embodiment of the present invention; Figure 7This is a three-dimensional structural diagram of a silent high-grade vibration-damping track bed (including a base and a cover plate) according to an embodiment of the present invention. That is, the present invention also provides a silent high-grade vibration-damping track bed, which includes multiple such silent high-grade vibration-damping track bed unit structures.

[0040] As shown in the figure, multiple silent high-level vibration-damping track bed unit structures are spliced ​​end to end through limiting grooves (4) and limiting bosses (5), and are set in a single base (7), thereby forming a silent high-level vibration-damping track bed. The cover plate (6) can also be laid between the irregular I-beam transverse connecting structures (3) of two adjacent unit structures, thereby achieving the coverage and sound insulation of the entire track bed.

[0041] Compared to existing technologies, the main structure of the silent high-grade vibration-damping track bed of this invention uses constrained damping to cover the longitudinal sleepers, which has excellent vibration isolation and sound absorption effects, achieving silent vibration isolation and improving passenger comfort. The external constraining layer of the constrained damping vibration reduction structure is made of a smooth, rigid non-metallic material plate, which can also be used as an isolation layer during the foundation pouring, reducing the formwork erection process, saving costs, and improving construction efficiency. In addition, the transverse connection structure of the irregular I-beams can increase the transverse bending section modulus of the track bed, effectively suppressing the transverse bending vibration amplitude of the track.

[0042] The embodiments of the present invention have been described above by way of example, but the present invention is not limited to the embodiments described above. The basic idea of ​​the present invention lies in the above basic scheme. For those skilled in the art, designing various modified models, formulas, and parameters based on the teachings of the present invention does not require creative effort. Changes, modifications, substitutions, and variations made to the embodiments without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A quiet, high-level vibration-damping track bed unit structure, characterized in that, include: Two longitudinal pillows (1), two constraint damping vibration reduction structures (2), multiple irregular I-beam transverse connection structures (3), limiting grooves (4) and limiting bosses (5); Among them, the multiple irregular I-beam transverse connection structures (3) are connected between two longitudinal sleepers (1), thereby forming the main structure of the silent high-level vibration reduction track bed unit structure; Two constrained damping vibration reduction structures (2) are respectively wrapped around the outer side wall, bottom and about 1 / 3 of the inner side wall from bottom to top of a longitudinal beam (1); Each longitudinal beam (1) has a limiting groove (4) at one end and a limiting boss (5) that cooperates with the limiting groove (4) at the other end; A first polymer elastic layer (42) is attached to the groove (41) of the limiting groove (4).

2. The silent high-grade vibration-damping track bed unit structure according to claim 1, characterized in that, The transverse connection structure (3) of the irregular I-beam is composed of irregular I-beams with a small upper cross section and a large lower cross section.

3. The silent high-level vibration-damping track bed unit structure according to claim 1, characterized in that, The multiple irregular I-beam transverse connection structures (3) are integrated with the two longitudinal pillows (1).

4. The silent high-level vibration-damping track bed unit structure according to claim 1, characterized in that, It also includes a base (7), with two longitudinal pillows (1) set in the base (7), and the bottom surface and outer side wall of each longitudinal pillow (1) contacting the base (7) through a constraint damping structure (2).

5. The silent high-level vibration-damping track bed unit structure according to claim 1, characterized in that, It also includes a cover plate (6) laid between two irregular I-beam transverse connecting structures (3), the top of which is basically flush with the upper surface of the longitudinal beam (1).

6. The silent high-level vibration-damping track bed unit structure according to claim 5, characterized in that, The cover plate (6) is a TMD tunable dynamic vibration damping cover plate, which consists of a cavity and a top plate, and the cavity is filled with damping vibration absorbing material.

7. The silent high-level vibration-damping track bed unit structure according to claim 1, characterized in that, The constrained damping vibration reduction structure (2) includes a second polymer elastic material layer (21) and a non-metallic constrained layer (22), and the second polymer elastic material layer (21) is combined with the longitudinal pillow (1).

8. The silent high-level vibration-damping track bed unit structure according to claim 1 or 6, characterized in that, The polymer elastic material is selected from rubber and polyurethane.

9. The silent high-grade vibration-damping track bed unit structure according to claim 6, characterized in that, The non-metallic constraint layer (22) has a smooth surface and is made of a non-metallic thin-film material selected from rigid engineering plastics, light-curing resins, fiberglass sheets or carbon fibers.

10. A silent, high-grade vibration-damping track bed, characterized in that, It includes multiple silent high-level vibration-damping track bed unit structures according to any one of claims 1-9, which are spliced ​​end to end by limiting grooves (4) and limiting bosses (5).

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