Vulcanization bonding vibration reduction fastener with low installation height

Abstract

The utility model provides a low-installation-height vulcanization bonding vibration reduction fastener. The fastener comprises a lower base plate, a middle layer and an upper base plate. The lower base plate is of a full-constraint frame type structure and comprises a full-constraint frame and a containing part, and the containing part is arranged in the full-constraint frame and used for containing the middle layer and the upper base plate. The middle layer comprises a restrained frame and a contained part, the restrained frame correspondingly covers the full-restrained frame, the contained part is arranged in the containing part, and the upper base plate is clamped in an inner groove of the contained part; an inner retaining shoulder structure is arranged at the position, corresponding to the outer retaining shoulder structure, of the upper base plate, an anti-pull-off structure is arranged on the outer side of the inner retaining shoulder structure, and the anti-pull-off structure is tightly matched with the limiting structure to achieve full constraint on the upper base plate. A full-constraint structural design concept is adopted, the retaining shoulder structure and the anti-pull-off limiting structure are designed to achieve full constraint on the upper iron base plate, the installation height of the fastener can be effectively reduced through the full-constraint structure, and meanwhile the rail stability is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the field of rail transit vibration-damping fasteners, and in particular relates to a vulcanized bonding vibration-damping fastener with a low installation height. Background Art

[0002] With the rapid economic growth of my country, the urban population has increased dramatically, and urban traffic problems have become increasingly acute. Rail transit is a form of transportation with large carrying capacity, punctuality and energy saving, which has led to the rapid development of rail transit. The subway is the main form of urban rail transit.

[0003] During operation, subways usually pass through densely populated areas and areas with concentrated roof properties. These areas are usually sensitive to environmental vibration and noise. At the same time, excessive vibration is not conducive to the safe operation of the subway. Therefore, subway vibration reduction and noise reduction work has received more and more attention. At present, the main subway vibration reduction measures include vibration reduction ballast and vibration reduction track. Among them, the vibration reduction track mainly relies on vibration reduction fasteners to achieve vibration reduction effect. Common vibration reduction fasteners include double-layer nonlinear vibration reduction fasteners, vulcanized bonding vibration reduction fasteners, floating rail vibration reduction fasteners, etc., covering the medium and high vibration reduction range.

[0004] Vulcanized bonded vibration damping fasteners are elastic split fasteners that rely on rubber adhesive to vulcanize and bond the upper and lower iron plates and rubber into one piece, and use elastic bars to constrain the rails. This type of fastener can adjust the rigidity of the fastener by adjusting the material of the rubber, and utilize the compression deformation of the rubber to meet the vibration damping performance. At the same time, when the spiral spikes are fixed, they do not pass through the elastic layer, avoiding the loss of elasticity caused by tightening the bolts when the fasteners are installed.

[0005] The more representative existing vulcanized adhesive fasteners are Cologne Egg fasteners and Lord fasteners. Among them, the installation height of Cologne Egg fasteners is relatively high, exceeding 60mm. For existing line operation and maintenance renovation projects, the installation height matching with ordinary fasteners is poor; at the same time, Cologne Egg fasteners are shear-type vibration-damping fasteners. Due to their shear-type structural characteristics, they are prone to track corrugation, so this type of fastener is rarely used in new lines. Lord fasteners are a compression-type vibration-damping fastener, which is vulcanized with rubber through upper and lower iron pads, and relies on the rubber layer to achieve vibration reduction effect. The height of Lord fasteners without the underrail pad is 50mm, which is still higher than the installation height of ordinary fasteners; for existing line renovation projects, the fastener installation height is required to be as low as possible to match the installation height of ordinary fasteners, avoid height adjustment or reduce the workload of height adjustment, and at the same time, fasteners without height adjustment pads are safer.

[0006] Existing vulcanized bonding fasteners such as invention patents CN 114657821 A, "A Track Vibration Damping Fastener with High Lateral Stability and Its Variable Stiffness Method", CN 221003631 U, "A High-Stability Vulcanized Bonding Fastener", CN 220767567 U, "A Clamping-Type Vibration Damping Fastener", etc. This type of fastener adopts a laminated design of upper and lower iron pads and vulcanized rubber, resulting in too high an installation height; shoulder structures are provided on both sides of the lower iron pad. Although the lateral stiffness of the fastener is effectively improved, no constraint is imposed on the upper iron pad longitudinally, that is, the lower iron pad is not designed with a full-constraint structure and cannot fully constrain the upper iron pad. Summary of the Invention

[0007] In view of this, the utility model discloses a vulcanized bonding vibration damping fastener with a low installation height, which adopts a full-constraint frame embedded structure design to achieve the low installation height of the vulcanized bonding vibration damping fastener, aiming to solve the problems of too high an installation height and inability to achieve full constraint in the prior art of vulcanized bonding fasteners.

[0008] A vulcanized bonding vibration damping fastener with a low installation height, the fastener includes a lower pad, an intermediate layer, and an upper pad;

[0009] The lower pad adopts a full-constraint frame structure, including a full-constraint frame and a receiving part. The receiving part is placed inside the full-constraint frame and is used to receive the intermediate layer and the upper pad; outer shoulder structures are provided at two diagonal positions of the full-constraint frame, and a limiting structure is provided inside the outer shoulder structures to achieve full constraint of the lower pad on the upper pad;

[0010] The intermediate layer includes a constrained frame and a received part. The constrained frame correspondingly covers the full-constraint frame, and the received part is arranged inside the receiving part. The upper pad is clamped in the inner groove of the received part;

[0011] The upper pad is provided with an inner shoulder structure corresponding to the position of the outer shoulder structure, and an anti-pull-off structure is provided on the outer side of the inner shoulder structure. The anti-pull-off structure is closely matched with the limiting structure to achieve full constraint of the upper pad.

[0012] Further, screw spike holes that penetrate up and down are also provided at the diagonal positions of the full-constraint frame. Tooth teeth are provided at the top of the screw spike holes, and a positioning buckle is provided on one side of the screw spike holes close to the outer edge.

[0013] Further, the screw spike holes are oblong holes.

[0014] Further, two side baffles are provided on the lateral sides of the outer shoulder structure, and an upper baffle is provided on the longitudinal upper side of the outer shoulder structure.

[0015] Furthermore, a first gap is formed between the upper baffle and the inner shoulder structure, and a second gap is formed between the upper baffle and the anti-pull-off structure. The intermediate layer is filled between the first gap and the second gap.

[0016] Furthermore, an anti-pull-off limiting structure is provided between the inner shoulder structure and the outer shoulder structure. The anti-pull-off limiting structure includes a limiting structure and an anti-pull-off structure. The limiting structure includes an outer shoulder structure, a side baffle, and an upper baffle, and the limiting structure is a hollow cavity structure; the anti-pull-off structure is a triangular prism structure with a right-angled cross-section, and the right-angled side of the triangular prism is fixedly connected to the inner shoulder structure.

[0017] Furthermore, during the service process of the fastener, the upper bearing plate slowly moves downward along the hypotenuse of the anti-pull-off structure until the upper edge right-angled side of the anti-pull-off structure is clamped with the lower surface of the upper baffle of the limiting structure.

[0018] Furthermore, through holes are provided in the intermediate layer corresponding to the positions of the spiral spike holes, and the through holes are larger than the spiral spike holes; a middle shoulder structure is provided in the intermediate layer corresponding to the position of the outer shoulder structure, and the middle shoulder structure is filled between the outer shoulder structure and the inner shoulder structure.

[0019] Furthermore, a square hole is provided in the received portion of the intermediate layer, and drain holes are provided on both diagonal sides of the received portion. The square hole and the drain holes longitudinally penetrate the intermediate layer.

[0020] Furthermore, the intermediate layer is designed with a high torsional resistance structure. The bottom of the intermediate layer adopts a staggered arrangement of stud structures, and the studs are designed with a conical structure.

[0021] Compared with the prior art, the present utility model has the following beneficial effects:

[0022] 1) Adopting the design concept of a full restraint structure, the fastener as a whole adopts a frame-embedded structure design to achieve a low installation height design of the fastener. The lower bearing plate adopts a full restraint frame structure in cooperation with the end shoulders and the anti-pull-off structure to jointly achieve full restraint on the upper bearing plate. The full restraint structure can effectively reduce the installation height of the fastener and greatly improve the track stability at the same time.

[0023] 2) The bottom rubber of the vulcanized bonded fastener adopts a stud structure. By staggering the arrangement of the stud structures, the horizontal overturning effect can be effectively resisted.

[0024] 3) The stud structure at the bottom of the rubber layer is designed with a conical structure. When different upper loads act on the fastener, the contact area between the studs at the bottom of the rubber layer and the sleeper is different, realizing the characteristics of "low load and low stiffness, high load and high stiffness". Description of the Drawings

[0025] Figure 1This is the general assembly drawing of a vulcanized bonding vibration damping fastener with a low installation height of the present utility model;

[0026] Figure 2 This is the part drawing of the vulcanized bonding vibration damping fastener of the present utility model;

[0027] Figure 3 This is the structural drawing of the lower tie plate of the present utility model;

[0028] Figure 4 This is the structural drawing of the middle layer of the present utility model;

[0029] Figure 5 This is the schematic structural drawing of the bottom of the middle layer of the present utility model;

[0030] Figure 6 This is the structural drawing of the upper tie plate of the present utility model;

[0031] Figure 7 This is the full constraint structural drawing of the vulcanized bonding vibration damping fastener of the present utility model;

[0032] Figure 8 This is the present utility model Figure 7 The enlarged view of part A in.

[0033] Reference numerals:

[0034] Lower tie plate 1, full constraint frame 11, outer shoulder structure 111, side baffle 1111, upper baffle 1112, outer baffle 1113; receiving portion 12; spiral spike hole 13, first outer fitting surface 131, first chamfer 1311, second outer fitting surface 132, tooth 133; positioning buckle 14; middle layer 2, constrained frame 21, middle shoulder structure 211, middle side baffle 2111, middle upper baffle 2112; received portion 22, square hole 221, drainage hole 222; through hole 23, first inner fitting surface 231, second chamfer 2311, second inner fitting surface 232, third inner fitting surface 233, positioning surface 24, limiting cavity 25, first gap 261, second gap 262; upper tie plate 3, inner shoulder structure 31, elastic strip receiving portion 32, elastic strip accommodating hole 321, third outer fitting surface 333; anti-pull-off limiting structure 4, limiting structure 41, anti-pull-off structure 42; Detailed implementation manners

[0035] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. In the embodiments of the present utility model, the descriptions such as "first", "second", etc. are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of the technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0037] Embodiment 1

[0038] In the prior art, traditional fasteners all adopt the laminated design of upper and lower backing plates and vulcanized rubber, and the installation height is too high; at the same time, the existing traditional fasteners only apply lateral constraints to the upper backing plate, and do not apply longitudinal constraints to the upper backing plate, that is, it is not a fully constrained structure.

[0039] In order to solve the problems that the installation height of the vulcanization bonding type fastener in the prior art is too high and full constraint cannot be achieved, the present embodiment provides a low-installation-height vulcanization bonding damping fastener, as Figures 1 to 7 shown. The vulcanization bonding type fastener includes a lower backing plate 1, an intermediate layer 2, and an upper backing plate 3. The materials of the lower backing plate 1 and the upper backing plate 3 are the same, and can be metal materials such as iron or steel; among them, the lower backing plate 1 adopts a fully constrained frame structure. Specifically, the lower backing plate 1 adopts a frame structure, and in combination with the outer shoulder structures 111 on both sides and the limiting structure 41, the lower backing plate 1 realizes full constraint on the upper backing plate 3; the upper backing plate 3 is embedded in the frame structure of the lower backing plate 1, and the inner shoulder structure 31 is also embedded in the outer shoulder structure 111. The intermediate layer 2 fills the gap between the lower backing plate 1 and the upper backing plate 3, realizes full constraint of the lower iron backing plate 1 on the upper iron backing plate 3, and at the same time can effectively reduce the installation height of the fastener and realize the low-installation-height design of the fastener.

[0040] As Figure 3 shown, the lower backing plate 1 adopts a fully constrained frame 11, which can realize full constraint on the upper backing plate 3 in three directions; the accommodating part 12 is placed inside the fully constrained frame 11 and is used to accommodate the intermediate layer 2 and the upper backing plate 3 to realize the low-installation design of the fastener structure;

[0041] Outer shoulder structures 111 are provided at two diagonal positions of the fully constrained frame 11. The outer shoulder structure 111 includes side baffles 1111, upper baffles 1112 and outer baffles 1113. Side baffles 1111 are provided on the transverse two sides of the outer baffle 1113. The two side baffles 1111 have transverse constraints on the upper bearing plate 3, and at the same time can effectively reduce the transverse displacement of the rail head, which is beneficial to driving safety; an upper baffle 1112 is provided on the longitudinal upper side of the outer baffle 1113; a limiting structure 41 is provided inside the outer shoulder structure 111, which is a hollow cavity structure inside the outer shoulder structure 111; in addition, screw spike holes 13 that penetrate up and down are provided at the other two diagonal positions. The screw spike holes 13 are used to install screw spikes, and the hole pitches of different screw spike holes 13 can be set according to the line conditions to adapt to fasteners of different hole pitch types; wherein, tooth teeth 133 are provided at the top of the screw spike holes 13, and a positioning buckle 14 is provided on one side of the screw spike holes 13 close to the outer edge.

[0042] As Figure 5 shown, the shape of the upper bearing plate 3 matches the shapes of the fully constrained frame 11 and the accommodating portion 12 of the lower bearing plate 1, and is slightly smaller than the accommodating portion 12 of the lower bearing plate 1; wherein, no screw spike holes or other settings are made at the positions of the upper bearing plate 3 corresponding to the screw spike holes 13 of the lower bearing plate 1, that is, the upper bearing plate 3 does not cover the screw spike holes 13 of the lower bearing plate 1 to ensure that the screw spike holes do not penetrate through the upper bearing plate. An inner shoulder structure 31 is provided at the position of the upper bearing plate 3 corresponding to the outer shoulder structure 111. Further, a spring clip accommodating portion 32 is provided inside the inner shoulder structure 31, and the spring clip accommodating portion 32 is provided with a spring clip accommodating hole 321; an anti-pull-off structure 42 is provided outside the inner shoulder structure 31. The anti-pull-off structure 42 is a triangular prism structure with a right-angled cross-section, and one of the right-angled sides is fixedly connected to the inner shoulder structure 31.

[0043] As Figures 6 to 7 shown, an anti-pull-off limiting structure 4 is provided between the inner shoulder structure 31 and the outer shoulder structure 111, which can effectively prevent the upward displacement of the upper bearing plate 3 and realize the longitudinal constraint of the lower bearing plate 1 on the upper bearing plate 3;

[0044] Specifically, the anti-pull-off limit structure 4 includes a limit structure 41 and an anti-pull-off structure 42. During the service of the fastener, after the upper bearing plate 3 is stressed, it slowly moves downward along the hypotenuse of the anti-pull-off structure 42 until the upper edge right-angle side of the anti-pull-off structure 42 is clamped with the lower surface of the upper baffle 1112 of the limit structure 41. At this time, the lower bearing plate 1 realizes the longitudinal constraint on the upper bearing plate 3. At the same time, the outer shoulder structure 111 and the inner shoulder structure 31 on both horizontal sides are in a tightened state through the anti-pull-off limit structure 4, realizing the horizontal constraint of the lower bearing plate 1 on the upper bearing plate 3. In this state, there will be a gap at the shoulder position between the upper bearing plate 3 and the lower bearing plate 1. Specifically, a first gap 261 is formed between the upper baffle 1112 and the inner shoulder structure 31, and a second gap 262 is formed between the upper baffle 1112 and the anti-pull-off structure 42. The intermediate layer 2 is filled between the first gap 261 and the second gap 262 (to ensure the clarity and readability of the drawings, Figure 8 the intermediate layer is omitted); during the service of the fastener, the first gap 261 and the second gap 262 between the upper bearing plate 3 and the lower bearing plate 1 are filled with the intermediate layer 2, which can provide a certain buffer zone for the relative movement between the upper and lower bearing plates, prevent excessive local stress, and effectively improve the service life of the fastener.

[0045] After the upper bearing plate 3 is embedded in the frame structure of the lower bearing plate 1, there is a certain gap between the upper bearing plate 3 and the lower bearing plate 1. Rubber or other elastic materials are filled between the upper bearing plate 3 and the lower bearing plate 1 as the intermediate layer 2, and the damping effect is realized by relying on the intermediate layer 2. In addition, the intermediate layer 2 adopts a high torsional resistance rubber structure, which can improve the torsional resistance effect of the fastener. The bottom of the intermediate layer 2 adopts a stud structure. Through the staggered stud structure, the horizontal flipping effect can be effectively resisted. At the same time, the vertical joint static stiffness of the fastener can be changed by adjusting the number of studs. Among them, the studs are designed with a conical structure. When different upper loads act on the fastener, the contact area between the studs at the bottom of the intermediate layer 2 and the sleeper is different, realizing the adjustable stiffness: the characteristics of low load and low stiffness, and high load and high stiffness.

[0046] As Figures 1 to 4 shown, the intermediate layer 2 fills the gap between the upper and lower bearing plates 1 and the upper bearing plate 3. The shape of the intermediate layer 2 matches the gap after the lower bearing plate 1 and the upper bearing plate 3 are fitted together. Specifically, the intermediate layer 2 includes a constrained frame 21 and a received part 22. The constrained frame 21 correspondingly covers the full constraint frame 11 of the lower bearing plate 1. The received part 22 is in a groove shape and is clamped inside the receiving part 12. The upper bearing plate 3 is clamped in the inner hollow groove of the received part 22.

[0047] Specifically, through holes 23 are provided in the middle layer 2 corresponding to the positions of the spiral spike holes 13 of the lower backing plate 1. The through holes 23 are slightly larger than the spiral spike holes 13, that is, the through holes 23 do not cover the positions of the spiral spike holes 13, ensuring that the spiral spikes do not pass through the middle layer 2. The first inner fitting surface 231 at the edge of the through hole 23 fits on the first outer fitting surface 131 at the edge of the spiral spike hole 13. The first inner fitting surface 231 and the first outer fitting surface 131 are flush in height, and the first chamfer 1311 and the second chamfer 2311 fit together, which can better fix the position between the middle layer 2 and the lower backing plate 1; the second inner surface 232 at the edge of the through hole 23 fits and wraps around the second outer fitting surface 132 at the edge of the spiral spike hole 13. The height of the second inner fitting surface 232 is greater than the height of the second inner fitting surface 132, so that while ensuring that the through hole 23 does not cover the spiral spike hole 13, the middle layer 2 wraps around the lower backing plate 1, playing a good role in vibration reduction and buffering; the third inner fitting surface 233 of the middle layer 2 fits with the third outer fitting surface 333 of the upper backing plate 3, so that the upper backing plate 3 is clamped in the inner groove of the middle layer 2.

[0048] The middle layer 2 is provided with a middle shoulder structure 211 corresponding to the position of the outer shoulder structure 111. The middle shoulder structure 211 is similar in shape to the outer shoulder structure 111. The inner surface of the middle shoulder structure 211 fits with the outer surface of the upper shoulder structure 111, that is, the middle shoulder structure 211 covers the outer shoulder structure 111. A positioning cavity 25 is provided inside the middle shoulder structure 211. The positioning cavity 25 is jointly formed by the concave cavity inside the middle shoulder structure 211 and the positioning surface 24. When the fastener is in service, the anti-pull-off structure 42 is in close cooperation with the positioning cavity 25; specifically, the positioning surface 24 inside the middle shoulder structure 211 fits with the inclined surface of the right-angled triangular prism of the anti-pull-off structure 41, restricting the longitudinal displacement of the anti-pull-off structure 41, and further having a longitudinal constraint on the upper backing plate 3; the positioning surface 24 is arc-connected with the received part 22 of the middle layer 2, and the part below the positioning surface 24 is filled with the middle layer 2. The positioning surface 24 is an inclined surface, and the design of its inclined surface fitting and filling effectively increases the bonding area of the middle layer 2, which can improve the fatigue performance of the fastener.

[0049] A square hole 221 is provided in the middle of the received part 22, and the square hole 221 runs through the entire longitudinal height of the middle layer 2. The design of the square hole 221 is used to adjust the stiffness of the fastener. The larger the square hole 221 is, the lower the stiffness of the fastener is. The smaller the area of the square hole 221 is, the higher the stiffness of the fastener is; in addition, drainage holes 222 are provided on both diagonal sides of the received part 22.

[0050] Preferably, in the anti-pull-off limiting structure 4, the lower surface of the triangular prism of the anti-pull-off structure 42 is designed with an inclined surface at a certain angle, which can effectively increase the bonding area of the middle layer 2, increase the thickness of the middle layer 2 between the upper backing plate 3 and the lower backing plate 1, is beneficial to stiffness adjustment, and can also improve the fatigue performance of the fastener.

[0051] The lower backing plate 1, the upper backing plate 3 and the intermediate layer 2 are vulcanized into one body with the help of an adhesive; after vulcanization and molding, the upper backing plate 3 and the intermediate layer 2 are both restricted on the full-constraint frame of the lower backing plate, which can effectively reduce the installation height of the fastener and achieve the design of low installation height of the fastener; at this time, the installation height of the fastener in this application can reach the lowest of 40±5 mm, and at the same time, the lower backing plate 1 can also fully constrain the upper backing plate 3 to improve the overall stability of the fastener.

[0052] In addition, during the construction of the vulcanized bonding type fastener of the present utility model, the lower end is installed on the sleeper, slab track bed and other basic components of the track foundation through a screw spike, and the upper end realizes the constraint on the rail through a spring clip; at the same time, for conventional spare parts such as the rail pad, screw spike, spring clip, etc., their structures and assembly conditions can all adopt the existing technology and will not be elaborated here.

[0053] Furthermore, the vulcanized bonding type fastener adopts a gauge block design, and at the same time the screw spike adopts an oblong hole design, which can increase the gauge adjustment amount, that is, the rail gauge can be adjusted within a large range. Compared with the fastener without a gauge block design, when on-site fine adjustment of the rail gauge is required, the fastener of this application does not need to disassemble the screw spike, and the fine adjustment amount can be achieved by replacing the gauge block, while the fastener without a gauge block can only achieve it by disassembling the screw spike.

[0054] Although the present utility model is disclosed as above, the present utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the scope defined by the claims.

Claims

1. A vulcanized bonding vibration damping fastener with a low installation height, characterized in that, The fastener includes a lower backing plate (1), an intermediate layer (2), and an upper backing plate (3); The lower backing plate (1) adopts a fully constrained frame structure, including a fully constrained frame (11) and a receiving portion (12). The receiving portion (12) is placed inside the fully constrained frame (11) for receiving the intermediate layer (2) and the upper backing plate (3). Outer shoulder structures (111) are provided at two diagonal positions of the fully constrained frame (11), and a limiting structure (41) is provided inside the outer shoulder structures (111) to achieve full constraint of the upper backing plate (3) by the lower backing plate (1); The intermediate layer (2) includes a constrained frame (21) and a received portion (22). The constrained frame (21) correspondingly covers the fully constrained frame (11), and the received portion (22) is provided inside the receiving portion (12). The upper backing plate (3) is clamped in the inner groove of the received portion (22); The upper backing plate (3) is provided with an inner shoulder structure (31) corresponding to the position of the outer shoulder structure (111), and an anti-pull-off structure (42) is provided outside the inner shoulder structure (31). The anti-pull-off structure (42) is in close fit with the limiting structure (41) to achieve full constraint of the upper backing plate (3).

2. The fastener according to claim 1, wherein, Through holes for spiral spikes (13) that penetrate up and down are also provided at the diagonal positions of the fully constrained frame (11). Teeth (133) are provided at the top of the through holes for spiral spikes (13), and a positioning buckle (14) is provided on one side of the through holes for spiral spikes (13) close to the outer edge.

3. The fastener according to claim 2, characterized in that, The through holes for spiral spikes (13) are oblong holes.

4. The fastener according to claim 2, wherein, The outer shoulder structure (111) includes side baffles (1111), an upper baffle (1112), and an outer baffle (1113). Two side baffles (1111) are provided on the transverse two sides of the outer baffle (1113), and an upper baffle (1112) is provided on the longitudinal upper side of the outer baffle (1113).

5. The fastener according to claim 4, characterized in that, A first gap (261) is formed between the upper baffle (1112) and the inner shoulder structure (31), and a second gap (262) is formed between the upper baffle (1112) and the anti-pull-off structure (42). The intermediate layer (2) is filled between the first gap (261) and the second gap (262).

6. The fastener according to claim 5, wherein An anti-pull-off limiting structure (4) is provided between the inner shoulder structure (31) and the outer shoulder structure (111). The anti-pull-off limiting structure (4) includes a limiting structure (41) and an anti-pull-off structure (42). The limiting structure (41) is a hollow cavity structure inside the outer shoulder structure (111); the anti-pull-off structure (42) is a triangular prism structure with a right-angled cross-section, and the right-angled side of the triangular prism is fixedly connected to the inner shoulder structure (31).

7. The fastener according to claim 6, wherein, During the service process of the fastener, the upper backing plate (3) slowly moves downward along the hypotenuse of the anti-pull-off structure (42) until the upper right-angled edge of the anti-pull-off structure (42) is clamped with the lower surface of the upper baffle (1112) of the limiting structure (41).

8. The fastener according to claim 1, wherein, A through hole (23) is provided in the intermediate layer (2) corresponding to the position of the spiral spike hole (13), wherein the through hole (23) is larger than the spiral spike hole (13); a middle shoulder structure (211) is provided in the intermediate layer (2) corresponding to the position of the outer shoulder structure (111), and the inner surface of the middle shoulder structure (211) fits with the outer surface of the outer shoulder structure (111).

9. The fastener according to claim 8, wherein A square hole (221) is provided in the received portion (22) of the intermediate layer (2), and drain holes (222) are provided on both diagonal sides of the received portion (22). Both the square hole (221) and the drain holes (222) penetrate through the intermediate layer (2).

10. The fastener according to claim 8, characterized in that, The intermediate layer (2) is designed with a high torsional resistance structure. The bottom of the intermediate layer (2) adopts a studded structure arranged in a staggered manner. Among them, the studs are designed with a conical structure.

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