Low-height double-layer damping fastener

Abstract

The utility model relates to the technical field of rail transit, in particular to a low-height double-layer vibration reduction fastener which comprises a lower base plate, an upper base plate, an elastic strip fixing device and a fastening device, a lower elastic base plate is vulcanized and bonded on the lower portion of the upper base plate, and the lower elastic base plate comprises a second plate body. A limiting boss is arranged on the side, away from the upper base plate, of the second plate body, the limiting boss and the fourth receding groove are installed in a matched mode, a rubber nail structure is arranged on the surface, away from the upper base plate, of the limiting boss, and the rubber nail structure extends out of the lower surface of the lower base plate. According to the low-height double-layer vibration reduction fastener, through innovative design and reasonable optimization of the structure, a more stable and more effective vibration reduction effect can be provided, the installation height and the overall weight are reduced, the installation process is simplified, the requirement of a system for infrastructures is reduced, the cost of the system is reduced, and the application range of the low-height double-layer vibration reduction fastener is widened. Therefore, the performance and the reliability of the product are improved, and the safety and the comfort of a rail transit system are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit, in particular to a low-height double-layer vibration damping fastener. Background Technique

[0002] With the rapid development of urban rail transit, more and more urban rail transit lines are laid in the ways of elevated lines, ground lines, etc., and more and more lines pass through residential areas and densely populated areas. Thus, while rail transit provides people with a fast and safe travel mode, the noise and vibration problems generated by it also seriously affect the quality of life of the surrounding residents and endanger the safety of buildings around the line. In order to reduce the noise and vibration generated during the operation of rail transit, vibration damping products such as floating slab tracks, rail dampers, and vibration damping fasteners are often used on rail transit. Among them, vibration damping fasteners have been widely used in rail transit construction due to their relatively convenient maintenance, low construction cost, good vibration damping and noise reduction effects, etc., and have become one of the simplest and effective measures to mitigate the impact on the safety of the surrounding environment and noise.

[0003] Among them, as a connecting component between the rail and the sleeper, the rail fastener not only plays the function of fixing the rail, but also its vibration damping and noise reduction functions have been increasingly valued by people. At present, a series of rail fastener products with vibration damping and noise reduction functions have been launched on the market. Among many vibration damping fastener products, the double-layer vibration damping fastener realizes two-layer elastomer vibration damping to achieve a higher vibration damping effect, and can conveniently realize the disassembly and replacement of parts, so it has been widely used and is deeply favored by the market.

[0004] The patent application of CN 208266595 U publicly disclosed by the applicant before, discloses a double-layer vibration damping fastener system, including an upper backing plate, a lower backing plate, an under-rail elastic pad, an intermediate elastic pad, an insulating bushing, a limit retaining plate, an anchor bolt and a spring clip; the lower backing plate is provided with a hollow boss, the side surface of the hollow boss is provided with a first buckle, the bottom end of the insulating bushing is provided with a second buckle, the top end of the insulating bushing is provided with a first protrusion for locking the upper surface of the upper backing plate, and the insulating bushing is used to realize the connection between the upper backing plate and the lower backing plate; the upper backing plate is provided with a spring clip seat, the spring clip is installed on the spring clip seat, the under-rail elastic pad is arranged above the upper backing plate, and the intermediate elastic pad is arranged below the upper backing plate; the limit retaining plate is arranged on the hollow boss, the top end of the anchor bolt is connected with the limit retaining plate, the main body of the anchor bolt penetrates through the hollow boss, and the bottom end of the anchor bolt is used for fixedly connecting to the track foundation; the intermediate elastic pad is provided with a first elastic body, and the lower backing plate and / or the upper backing plate are provided with accommodation cavities for placing the first elastic body. It has achieved good effects in reducing the installation height of the double-layer vibration damping fastener and effectively avoiding construction and maintenance defects caused by too high installation height.

[0005] As the applicant further studied and found that after long-term use of this type of double-layer vibration damping fastener system, the middle elastic pad undergoes permanent deformation after compression, and gaps appear between the upper and lower pads, thus posing certain potential safety hazards to train operation and increasing subsequent and operation and maintenance costs. On this basis, the applicant further optimized and upgraded the double-layer vibration damping system, and specifically proposed this application. Summary of the Invention

[0006] In view of this, the present invention aims to provide a low-height double-layer vibration damping fastener to further reduce the installation height of the double-layer vibration damping fastener and save the maintenance cost of subsequent products.

[0007] To achieve the above object, the technical solution of the present invention is realized as follows:

[0008] A low-height double-layer vibration damping fastener includes:

[0009] A lower pad, including a third plate body, on which a fourth avoidance groove and a hollow mounting seat are provided;

[0010] An upper pad, with a lower elastic pad vulcanized and bonded to its lower part. The lower elastic pad includes a second plate body. A limiting boss is provided on a side of the second plate body away from the upper pad. The limiting boss is fitted with the fourth avoidance groove for installation. A glue nail structure is provided on a surface of the limiting boss away from the upper pad, and the glue nail structure extends out of the lower surface of the lower pad;

[0011] A clip fixing device, provided on the upper pad and buckling a gauge block on a rail;

[0012] A fastening device, capable of pre-tightly connecting the lower pad, the lower elastic pad, and the upper pad and adjusting the pre-compression amount of the lower elastic pad during installation.

[0013] Further, the limiting boss and the fourth avoidance groove are in clearance fit, and the height H of the glue nail structure extending out of the lower surface of the lower pad ranges from 3 mm to 15 mm.

[0014] Further, a third avoidance hole is provided on the lower elastic pad.

[0015] Further, a fifth avoidance groove is provided on the lower surface of the third plate body. The fifth avoidance groove is correspondingly arranged with the hollow mounting seat. An elastic support seat is provided in the fifth avoidance groove. A support plate body of the elastic support seat extends out of the fifth avoidance groove and its lower surface is flush with the lower surface of the glue nail structure.

[0016] Further, a sixth avoidance groove is provided on the lower surface of the third plate body. One end of the sixth avoidance groove communicates with the fifth avoidance groove, and the other end extends to the end of the third plate body close to the fifth avoidance groove. Correspondingly, a limiting strip is provided on one side of the support plate body, and the limiting strip is installed in cooperation with the sixth avoidance groove.

[0017] Further, the sixth avoidance groove is arc-shaped. The limiting strip includes an arc-shaped limiting portion and a flat plate supporting portion, and the flat plate supporting portion is provided on the side of the arc-shaped limiting portion away from the sixth avoidance groove.

[0018] Further, a limiting flange is provided on the support plate body. The limiting flange is in interference fit with the connection through hole of the hollow mounting seat, and a seventh avoidance groove corresponding to the connection through hole is formed inside the limiting flange.

[0019] Further, the fastening device includes an anchor bolt, a heavy spring, a limiting buckle plate and a retaining sleeve. The retaining sleeve is clamped or screwed and self-locked with the hollow mounting seat. The limiting buckle plate is buckled on the upper end surface of the hollow mounting seat. The anchor bolt sequentially passes through the heavy spring, the limiting buckle plate, the retaining sleeve, the upper cushion plate, the lower elastic cushion plate, the hollow mounting seat, and the elastic support seat and is then anchored to the sleeper or the track bed foundation.

[0020] Further, two hollow mounting seats are provided in the length direction of the third plate body. Correspondingly, two fastening devices are provided.

[0021] Further, the two hollow mounting seats are arranged at the diagonal positions in the length direction of the third plate body. Outer shoulders are arranged at the other diagonal positions in the length direction of the third plate body. Correspondingly, inner shoulders are arranged at the diagonal positions on the upper cushion plate corresponding to the outer shoulders. A transverse block is arranged between the inner shoulder and the outer shoulder, and the elastic strip fixing device is arranged on the inner shoulder.

[0022] Compared with the prior art, the low-height double-layer vibration damping fastener of the present invention has the following advantages:

[0023] (1) The low-height double-layer vibration damping fastener of the present invention can provide a more stable and effective vibration damping effect through innovative design and reasonable structural optimization, reduce the installation height and overall weight, simplify the installation process, reduce the requirements of the system for the infrastructure, and help reduce the cost of the system, thereby improving the performance and reliability of the product and ensuring the safety and comfort of the rail transit system.

[0024] (2) The low-height double-layer vibration damping fastener of the present invention optimizes the vibration damping effect, simplifies the installation process, ensures the overall stable connection of the system, extends the service life of the vibration damping fastener, reduces the maintenance frequency and cost, and improves the reliability and economy of the system. Brief Description of the Drawings

[0025] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0026] Figure 1 is a front view structural schematic diagram of the low-height double-layer vibration damping fastener according to the embodiment of the present utility model;

[0027] Figure 2 is a side view structural schematic diagram of the low-height double-layer vibration damping fastener according to the embodiment of the present utility model;

[0028] Figure 3 is an exploded structural schematic diagram of the low-height double-layer vibration damping fastener according to the embodiment of the present utility model;

[0029] Figure 4 is Figure 3 a structural schematic diagram of the second perspective of the structure shown in;

[0030] Figure 5 is a front view structural schematic diagram of the lower backing plate according to the embodiment of the present utility model;

[0031] Figure 6 is a side view structural schematic diagram of the lower backing plate according to the embodiment of the present utility model;

[0032] Figure 7 is Figure 6 a structural schematic diagram of the second perspective of the structure shown in;

[0033] Figure 8 is a front view structural schematic diagram of the upper backing plate and the elastic backing plate under the plate after vulcanization bonding according to the embodiment of the present utility model;

[0034] Figure 9 is Figure 8 a bottom view schematic diagram of the structure shown in;

[0035] Figure 10 is Figure 8 a side view schematic diagram of the structure shown in;

[0036] Figure 11 is a side view structural schematic diagram of the elastic support seat according to the embodiment of the present utility model;

[0037] Figure 12 is a front view structural schematic diagram of the elastic support seat according to the embodiment of the present utility model;

[0038] Description of the reference numerals:

[0039] 1. Rail; 2. Elastic pad under the rail; 3. Upper pad, 301. First plate body; 302. Inner shoulder; 303. First avoidance groove; 4. Elastic pad under the plate, 401. Second plate body; 402. Limit boss; 403. Second avoidance groove; 404. Glue nail structure; 405. Third avoidance hole; 5. Lower pad, 501. Third plate body; 502. Outer shoulder; 503. Fourth avoidance groove; 504. Hollow mounting seat, 5041. Connecting through hole; 505. Fifth avoidance groove; 506. Sixth avoidance groove; 6. Gauge block; 7. Elastic strip fixing device, 701. First fixing bolt; 702. Elastic strip; 8. Lateral block; 9. Fastening device, 901. Anchor bolt; 902. Heavy spring; 903. Limit buckle plate; 904. Retaining sleeve; 10. Elastic support seat, 1001. Support plate body; 1002. Limit flange; 1003. Limit strip, 10031. Arc-shaped limit part; 10032. Flat support part; 1004. Seventh avoidance groove. Detailed implementation mode

[0040] In order to make the technical means, achieved purposes and effects of the present utility model easy to understand, the embodiments of the present utility model will be described in detail below with reference to specific drawings.

[0041] It should be noted that all terms for indicating directionality and positional indication in the present utility model, such as: "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "bottom", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection situation between components in a specific state (as shown in the drawings), and are only for the convenience of describing the present utility model, rather than requiring the present utility model to be constructed and operated in a specific orientation, so it should not be construed as a limitation to the present utility model. In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0042] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0044] As Figures 1 to 12 shown, the present utility model discloses a low-height double-layer vibration damping fastener, including:

[0045] The lower backing plate 5 includes a third plate body 501, on which a fourth avoidance groove 503 and a hollow mounting seat 504 are provided;

[0046] The upper backing plate 3 vulcanizes and bonds an elastic pad 4 under the plate at its lower part. The elastic pad 4 under the plate includes a second plate body 401. A limiting boss 402 is provided on the side of the second plate body 401 away from the upper backing plate 3. The limiting boss 402 is fitted and installed with the fourth avoidance groove 503. A glue nail structure 404 is provided on the surface of the limiting boss 402 away from the upper backing plate 3, and the glue nail structure 404 extends out of the lower surface of the lower backing plate 5;

[0047] The elastic rail clip fixing device 7 is arranged on the upper backing plate 3 and presses the gauge block 6 onto the rail 1;

[0048] The fastening device 9 can pre-tightly connect the lower backing plate 5, the elastic pad 4 under the plate, and the upper backing plate 3 and adjust the pre-compression amount of the elastic pad 4 under the plate during installation.

[0049] For the low-height double-layer vibration damping fastener disclosed in this application, by vulcanizing and bonding the elastic pad 4 under the plate and the upper backing plate 3 into one body, the "gap" phenomenon that appears after long-term use of the existing double-layer vibration damping fastener assembly structure is eliminated, ensuring that the vibration damping fastener maintains a stable structure and performance during long-term use. The pre-tight connection of the lower backing plate, the elastic pad under the plate, and the upper backing plate is controlled by the fastening device 9, and the pre-compression amount of the elastic pad 4 under the plate during installation is adjusted, giving full play to the vibration damping effect of the elastic pad 4 under the plate, avoiding affecting the stiffness and service life of the elastic pad 4 under the plate due to over-compression, and by making the glue nail structure 404 provided below the elastic pad 4 under the plate extend out of the lower surface of the lower backing plate 5, the use of the coupling pad is reduced, thereby reducing the height of the entire system.

[0050] The low-height double-layer vibration damping fastener described in this application can provide more stable and effective vibration damping effects through innovative design and reasonable structural optimization, reduce the installation height and overall weight, simplify the installation process, lower the requirements of the system for infrastructure, and help reduce the system cost, thereby improving the performance and reliability of the product and ensuring the safety and comfort of the rail transit system.

[0051] As a preferred example of this application, the limiting boss 402 and the fourth relief groove 503 are in clearance fit, and the height of the adhesive nail structure 404 protruding from the lower surface of the lower backing plate 5 is H, and the value range of H is 3 mm to 15 mm. As a specific example of this application, the installation fit clearance between the limiting boss 402 and the fourth relief groove 503 is less than 5 mm.

[0052] By making the limiting boss 402 and the fourth relief groove 503 in clearance fit, the fastening device 9 can reliably adjust the pre-tightening thickness of the second plate body 401 on the elastic pad under the plate during pre-tightening installation, thereby exerting the best vibration damping effect, and can ensure the stable assembly structure of the vibration damping fastener, prevent loosening or dislocation during use, optimize the performance of the vibration damping system, and improve its working effect and reliability.

[0053] As a preferred example of this application, a third relief hole 405 is provided on the elastic pad under the plate 4. Preferably, a plurality of the third relief holes 405 are provided, and the plurality of the third relief holes 405 are evenly distributed or symmetrically arranged on the elastic pad under the plate 4, and the third relief hole 405 penetrates through the second plate body 401 and the limiting boss 402.

[0054] This setting increases the air permeability and drainage of the elastic pad under the plate 4 on the one hand, prevents moisture from accumulating under the elastic pad under the plate 4, reduces the possibility of dampness and corrosion, and thus prolongs its service life. At the same time, this design makes the elastic pad under the plate more flexible, can disperse the pressure more evenly when subjected to vibration or impact, reduce the damage to the elastic pad under the plate, and thus strengthen the overall structural stability of the elastic pad under the plate 4 and improve its durability and reliability.

[0055] As a preferred example of the present application, the bonding surface between the second plate body 401 and the upper backing plate 3 is a flat surface. The upper backing plate 3 and the elastic backing plate 4 under the plate are vulcanized and bonded into a whole through a mold. The elastic backing plate 4 under the plate is provided with a second plate body 401, a limiting boss 402, and a rubber nail structure 404 from top to bottom in sequence. The rubber nail structure 404 is arranged at the lower part of the limiting boss 402, and its structural form and quantity are designed according to the stiffness requirement of the elastic backing plate 4 under the plate to meet the overall stiffness requirement of the low-height double-layer vibration damping fastener described in the present application. By vulcanizing and bonding the elastic backing plate 4 under the plate and the upper backing plate 3 into a whole through a mold, the consistency and controllability of the bonding quality are ensured, thereby improving the manufacturing process level of the product, ensuring the tight connection between the elastic backing plate 4 under the plate and the upper backing plate 3, and avoiding the separation problem caused by permanent deformation.

[0056] As a preferred example of the present application, a fifth avoidance groove 505 is provided on the lower surface of the third plate body 501. The fifth avoidance groove 505 is correspondingly arranged with the hollow mounting seat 504. An elastic support seat 10 is arranged in the fifth avoidance groove 505. The support plate body 1001 of the elastic support seat 10 extends out of the fifth avoidance groove 505 and its lower surface is flush with the lower surface of the rubber nail structure 404.

[0057] This setting enables the elastic support seat 10 and the lower backing plate 5 to form a nested or accommodating relationship, enabling it to effectively support the bottom of the vibration damping fastener, ensuring the tight combination of the two during assembly, reducing the installation height, thereby preventing the vibration damping fastener from loosening or displacing during operation, ensuring that the elastic support part of the vibration damping fastener is in the best working state, and thus effectively improving the vibration damping effect.

[0058] As a preferred example of the present application, a sixth avoidance groove 506 is provided on the lower surface of the third plate body 501. One end of the sixth avoidance groove 506 is communicated with the fifth avoidance groove 505, and the other end extends to the end of the third plate body 501 close to the fifth avoidance groove 505. Correspondingly, a limiting strip 1003 is arranged on one side of the support plate body 1001, and the limiting strip 1003 is installed in cooperation with the sixth avoidance groove 506.

[0059] This setting on the one hand ensures that the elastic support seat 10 and the third plate body 501 are more closely matched, preventing loosening or falling off during use, thereby improving the working effect and safety of the vibration damping fastener. At the same time, it can also better disperse and absorb vibration and impact force, realize the effective coordination and connection of each component inside the vibration damping system, and further improve the vibration damping effect of the vibration damping system.

[0060] As a preferred example of the present application, the sixth relief groove 506 is arranged in an arc shape. The limiting strip 1003 includes an arc-shaped limiting portion 10031 and a flat plate supporting portion 10032. The flat plate supporting portion 10032 is arranged on the side of the arc-shaped limiting portion 10031 away from the sixth relief groove 506. This setting ensures a firm and reliable connection between the limiting strip 1003 and the sixth relief groove 506, preventing loosening or misalignment during use, thereby improving the working effect and safety of the vibration damping fastener. At the same time, it can firmly support the bottom of the vibration damping fastener during assembly, improving the stability and reliability of the system.

[0061] As a preferred example of the present application, a limiting flange 1002 is arranged on the support plate body 1001. The limiting flange 1002 is in interference fit with the connection through hole 5041 of the hollow mounting seat 504, and a seventh relief groove 1004 corresponding to the connection through hole 5041 is formed inside the limiting flange 1002. This setting pre-assembles the elastic support seat 10 and the lower cushion plate 5 into one body, reducing the steps and time in the installation process, improving the installation efficiency, and at the same time reducing the possibility of errors during installation, making the installation process more simple and efficient. The interference fit assembly method ensures a firm connection, not easy to loosen or fall off, thereby improving the overall performance and reliability of the vibration damping fastener.

[0062] As a preferred example of the present application, the fastening device 9 includes an anchor bolt 901, a heavy spring 902, a limiting buckle plate 903, and a retaining sleeve 904. The retaining sleeve 904 is clamped or screwed and self-locked with the hollow mounting seat 504. The limiting buckle plate 903 is buckled on the upper end surface of the hollow mounting seat 504. The anchor bolt 901 sequentially passes through the heavy spring 902, the limiting buckle plate 903, the retaining sleeve 904, the upper cushion plate 3, the elastic cushion plate 4 under the plate, the hollow mounting seat 504, and the elastic support seat 10 and is then anchored to the sleeper or the ballast bed foundation. As an example of the present application, a first relief groove 303 corresponding to the hollow mounting seat 504 is arranged on the first plate body 301, and a second relief groove 403 corresponding to the hollow mounting seat 504 is arranged on the second plate body 401. The retaining sleeve 904 passes through the first relief groove 303 and the second relief groove 403 and is self-locked and fixed with the hollow mounting seat 504, further improving the overall assembly efficiency of the low-height double-layer vibration damping fastener of the present application, ensuring a firm connection between the retaining sleeve 904 and the hollow mounting seat 504, preventing them from loosening or falling off during operation, and improving the stability of the entire vibration damping fastener system.

[0063] As a preferred example of the present application, two hollow mounting seats 504 are provided in the length direction of the third plate body 501. Correspondingly, two fastening devices 9 are provided. As a specific example of the present application, the two hollow mounting seats 504 are arranged at the diagonal positions in the length direction of the third plate body 501, and outer shoulders 502 are arranged at the other diagonal positions in the length direction of the third plate body 501. Correspondingly, inner shoulders 302 are arranged at the diagonal positions on the upper cushion plate 3 corresponding to the outer shoulders 502. A transverse block 8 is arranged between the inner shoulder 302 and the outer shoulder 502, and the elastic strip fixing device 7 is arranged on the inner shoulder 302. For the low-height double-layer vibration damping fastener of the present application, an elastic pad 2 under the rail plate is arranged between the rail 1 and the upper cushion plate 3. The elastic strip fixing device 7 includes a first fixing bolt 701 and an elastic strip 702. The first fixing bolt 701 includes structures such as a T-shaped bolt, a nut and a flat washer. The elastic strip 702, in combination with the gauge block 6, presses and connects the rail foot of the rail 1 to the upper cushion plate 3. The first fixing bolt 701 is used to adjust the pressing force of the elastic strip 702. In view of the fixing method of the rail by the elastic strip in the fastener system and the form of the fastener connected to the sleeper by bolts being relatively common and there being many corresponding disclosures in the prior art, the present application will not elaborate further.

[0064] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A low-height double-layer vibration damping fastener, characterized in that, Comprising: Lower backing plate (5), including a third plate body (501), on which a fourth avoidance groove (503) and a hollow mounting seat (504) are provided; Upper backing plate (3), with a lower elastic backing plate (4) vulcanized and bonded to its lower part. The lower elastic backing plate (4) includes a second plate body (401). On the side of the second plate body (401) away from the upper backing plate (3), a limit boss (402) is provided. The limit boss (402) is fitted and installed with the fourth avoidance groove (503). On the surface of the limit boss (402) away from the upper backing plate (3), a glue nail structure (404) is provided, and the glue nail structure (404) extends out of the lower surface of the lower backing plate (5); Elastic clip fixing device (7), arranged on the upper backing plate (3) and clamping the gauge block (6) on the rail (1); Fastening device (9), capable of pre-tightly connecting the lower backing plate (5), the lower elastic backing plate (4), and the upper backing plate (3) and adjusting the pre-compression amount of the lower elastic backing plate (4) during installation.

2. The low-height double-layer vibration damping fastener according to claim 1, characterized in that The limit boss (402) is in clearance fit with the fourth avoidance groove (503). The height H of the glue nail structure (404) extending out of the lower surface of the lower backing plate (5) ranges from 3 mm to 15 mm.

3. The low-height double-layer vibration damping fastener according to claim 1, characterized in that A third avoidance hole (405) is provided on the lower elastic backing plate (4).

4. The low-height double-layer vibration damping fastener according to any one of claims 1 to 3, characterized in that, A fifth avoidance groove (505) is provided on the lower surface of the third plate body (501). The fifth avoidance groove (505) is correspondingly arranged with the hollow mounting seat (504). An elastic support seat (10) is provided in the fifth avoidance groove (505). The support plate body (1001) of the elastic support seat (10) extends out of the fifth avoidance groove (505) and its lower surface is flush with the lower surface of the glue nail structure (404).

5. The low-height double-layer vibration damping fastener according to claim 4, wherein, A sixth avoidance groove (506) is provided on the lower surface of the third plate body (501). One end of the sixth avoidance groove (506) is communicated with the fifth avoidance groove (505), and the other end extends to the end of the third plate body (501) close to the fifth avoidance groove (505). Correspondingly, a limit strip (1003) is provided on one side of the support plate body (1001), and the limit strip (1003) is fitted and installed with the sixth avoidance groove (506).

6. The low-height double-layer vibration damping fastener according to claim 5, wherein, The sixth avoidance groove (506) is arc-shaped. The limit strip (1003) includes an arc-shaped limit part (10031) and a flat plate support part (10032). The flat plate support part (10032) is arranged on the side of the arc-shaped limit part (10031) away from the sixth avoidance groove (506).

7. The low-height double-layer vibration damping fastener according to claim 5 or 6, characterized in that, A limit flange (1002) is provided on the support plate body (1001). The limit flange (1002) is in interference fit with the connection through hole (5041) of the hollow mounting seat (504). A seventh avoidance groove (1004) corresponding to the connection through hole (5041) is formed inside the limit flange (1002).

8. The low-height double-layer vibration damping fastener according to claim 7, characterized in that, The fastening device (9) includes an anchor bolt (901), a heavy spring (902), a limit clamping plate (903) and a retaining sleeve (904). The retaining sleeve (904) is snap-connected or screwed and locked with the hollow mounting base (504). The limit clamping plate (903) is buckled on the upper end surface of the hollow mounting base (504). The anchor bolt (901) sequentially passes through the heavy spring (902), the limit clamping plate (903), the retaining sleeve (904), the upper cushion plate (3), the elastic cushion plate under the plate (4), the hollow mounting base (504), and the elastic support base (10), and then is anchored to the sleeper or the ballast bed foundation.

9. The low-height double-layer vibration damping fastener according to claim 8, wherein, Two hollow mounting bases (504) are provided in the length direction of the third plate body (501). Correspondingly, two fastening devices (9) are provided.

10. The low-height double-layer vibration damping fastener according to claim 9, characterized in that, The two hollow mounting bases (504) are arranged at diagonal positions in the length direction of the third plate body (501). Outer shoulders (502) are arranged at the other diagonal positions in the length direction of the third plate body (501). Correspondingly, inner shoulders (302) are arranged at diagonal positions on the upper cushion plate (3) corresponding to the outer shoulders (502). A transverse block (8) is arranged between the inner shoulder (302) and the outer shoulder (502). The elastic rail clip fixing device (7) is arranged on the inner shoulder (302).

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