Rail brace type damping fastener system and construction process thereof

Abstract

The application discloses a rail support type damping fastener system and a construction process thereof, which comprises, from bottom to top, an insulation coupling pad plate, a bottom plate and a safety limiting pad plate, wherein the safety limiting pad plate is arranged at the bottom of a steel rail, side stop frames are movably arranged on the bottom plate and correspond to the positions of both sides of the steel rail, mounting grooves are arranged on the bottom plate and correspond to the positions of the bottom of the side stop frames, the top of the side stop frame is inwardly bent and abuts against the waist position of the steel rail, shoulder blocks are arranged on the bottom plate and correspond to the positions of the bottom of both sides of the steel rail, the shoulder blocks and the bottom plate form a mounting groove for mounting the steel rail, rail bottom stop blocks with elasticity are arranged at the contact positions between the inner side of the shoulder blocks and the bottom of the steel rail, and the rail bottom stop blocks and the shoulder blocks are provided with mutually matched clamping mechanisms. The system adopts a separated structure, can be disassembled when necessary, all the parts can be replaced, can completely constrain the side stop frames and improve the limiting and constraining effect on the rail bottom.

Description

Technical Field

[0001] This invention relates to the field of track vibration reduction technology, and in particular to a track brace vibration reduction fastener system and its construction process. Background Technology

[0002] Rail-braced vibration damping fasteners are a high-level vibration and noise reduction rail fastening system. This system uses elastic blocks on both sides of the rail to clamp it, causing the rail base to detach from the rail-bearing system, leaving the rail in a suspended state. The elastic blocks are fixed and supported by two side supports mounted on a base plate. The compression and shear deformation of the elastic blocks provides lateral and vertical restraint to the rail. Floating rail fasteners are generally used in sections with high requirements for vibration and noise reduction, and are currently widely used in countries around the world.

[0003] Most existing floating rail fasteners use a side-mounted sliding installation, with shoulders on an iron base plate and limiting blocks to constrain the side-mounted brackets. This requires specialized tooling during installation, and during subsequent operation, insufficient constraint from the side-mounted bracket blocks can lead to loosening of the side-mounted brackets and inadequate elastic block restraint, ultimately affecting the stability and safety of the fasteners.

[0004] This invention provides a rail-braced vibration damping fastener system with excellent vibration damping effect. The components are simple and convenient to install and disassemble. The side support frame is fully constrained by pre-tightened bolts and iron pads, effectively preventing loosening of the side support frame later. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide a rail-braced vibration damping fastener system and its construction process. The system adopts a split structure, which can be disassembled when necessary, and all parts can be replaced. At the same time, it can fully constrain the side guard and improve the limiting constraint effect on the rail bottom.

[0006] This invention is achieved through the following technical solution: a rail-supported vibration damping fastener system, comprising, from bottom to top, an insulating coupling pad, a base plate, and a safety limiting pad. The safety limiting pad is disposed at the bottom of the rail. Side guards are movably disposed on the base plate corresponding to the two sides of the rail. A positioning groove is disposed on the base plate corresponding to the bottom position of the side guards. The top of the side guards is bent inward and abuts against the waist of the rail. Shoulders are disposed on the base plate corresponding to the bottom positions of the two sides of the rail. The shoulders and the base plate form an installation groove for installing the rail. An elastic rail bottom stop is disposed at the contact position between the inner side of the shoulder and the bottom of the rail. A locking mechanism is disposed between the rail bottom stop and the shoulder.

[0007] To further optimize this invention, the following technical solutions may be preferred: Preferably, a first locking groove is provided at the bottom inner side of the shoulder along the length of the rail, and a first engaging part is provided on one side of the rail bottom block to cooperate with the first locking groove. A second locking groove is provided on the first engaging part, and a second engaging part is provided inside the first locking groove to cooperate with the second locking groove.

[0008] Preferably, a locking groove three is provided at the bottom inner side of the shoulder along the length of the rail, and a locking part three is provided on one side of the rail bottom block to cooperate with the locking groove three. An elastic hook is provided on the locking part three along the length of the rail, and the locking end of the elastic hook is facing the shoulder. A groove is provided at one end of the inner side of the locking groove three to cooperate with the elastic hook.

[0009] Preferably, a limiting part is provided at one end of the outer side of the rail bottom block to limit the installation position of the rail bottom block on the shoulder.

[0010] Preferably, a rubber wedge is movably provided on the top of the side stop, and a vulcanized steel plate is provided between the side stop and the rubber wedge. The outer side of the rubber wedge covers the web of the rail, and multiple resonant rods are embedded in the rubber wedge along the length of the rail.

[0011] Preferably, the bottom of the side guard is rotatably mounted on the base plate, and the bottom of the side guard is provided with an arc-shaped rotating part. The base plate is provided with an arc-shaped groove for lateral limiting constraint at the position corresponding to the side guard. The arc-shaped groove and the arc-shaped rotating part cooperate with each other. The base plate is also provided with a limiting boss at the positions corresponding to both sides of the side guard. The middle of the side guard is provided with a bolt hole. The middle of the side guard is connected to the base plate by a pre-tightening bolt installed in the bolt hole.

[0012] Preferably, the bottom of the side guard is provided with a group of teeth arranged side by side along the width direction of the rail, the base plate is provided with transverse limiting teeth that cooperate with the group of teeth, the base plate is also provided with limiting bosses two corresponding to the two sides of the side guard, the middle of the side guard is provided with bolt holes two, and the middle of the side guard is connected to the base plate by pre-tightening bolts two installed in the bolt holes two.

[0013] Preferably, the side support frame has three feet at the bottom that contact the base plate.

[0014] Preferably, the rail bottom block is a glass fiber reinforced nylon 66 material block, and a placement groove is provided in the middle of the base plate corresponding to the position of the safety limit pad.

[0015] A construction process for a rail-braced vibration damping fastener system, characterized by the following steps: S1: Pre-embed nylon sleeves. First, pre-embed the special nylon sleeves into the precast concrete base (precast block) according to the design hole spacing requirements, and cure for more than 48 hours. S2: For the connection between the base plate and the precast concrete block, first ensure that the sleeper surface is clean. Place the insulating coupling pad and the base plate (with the locking bolts passing through the bottom of the base plate) onto the sleeper or rail support platform in sequence. Then place the adjustment cover plate in the corresponding position on the base plate. Align the bolt holes of the base plate, the bolt holes of the insulating coupling pad, and the bolt holes of the adjustment cover plate with the pre-embedded nylon sleeve holes on the sleeper. After putting the anchor bolts with heavy-duty spring washers, tighten them manually or mechanically to the specified pre-tightening force. The bolt torque should be 150-200 N·m. S3: Place the anti-collision pad in the reserved groove of the base plate, and install the four rail bottom blocks on the four shoulders of the base plate in sequence; S4: Place the rails on the crash pads, ensuring the two rail feet are firmly attached to the rail base blocks on both sides. During rail placement, take care to maintain the correct installation position of the rail base blocks to prevent them from tipping over or falling off. S5: First, install the two rubber wedges on the two side rails respectively. The two concave holes on the back of the rubber wedges match the two protrusions on the side rails. Hold the combination of rubber wedges and side rails by hand and install the rubber wedges on the rail webs on both sides of the rail from top to bottom. The locking bolts pass through the pre-reserved bolt holes in the middle of the side rails. The rubber wedges fit tightly against the rail webs. The rotating shaft at the end of the side rails falls into the pre-reserved groove in the base plate.

[0016] S6: Lock the side retaining bracket. Install the flat washer, heavy-duty spring washer, and nut onto the locking bolt in sequence, and tighten the nut using a manual torque wrench or a mechanical torque wrench. Nut tightening torque control: For straight sections and curves with a radius ≥800m, control the torque at 60~100N·m; for other sections, control the torque at 100~125N·m. S7: Use concrete to pour precast concrete blocks into the ground to form a track bed; when welding rails, first remove the rail bracing vibration damping fasteners at the weld joint of the two rails, bring the two rails together and weld them, then grind the weld joint, and then repeat the above steps to install the rail bracing vibration damping fasteners.

[0017] The present invention has the following beneficial effects: 1. This vibration damping fastener uses two side brackets to clamp two rubber wedges on both sides of the rail, and locks the side brackets to the base plate using locking bolts, achieving both vertical support and lateral restraint for the rail. By laterally compressing the rubber wedges and maximizing their shear characteristics, it achieves high lateral stiffness and low vertical stiffness. Furthermore, this vibration damping fastener optimizes the side bracket locking structure, employing a simple bolt locking method. This not only simplifies the construction and installation process but also ensures complete locking of the side brackets, effectively preventing loosening during later operation.

[0018] 2. In this solution, the fastening system uses rotating side supports to install bolts, thereby clamping the rubber wedges onto the side supports and providing effective lateral and vertical constraints for the rails. This rail-braced vibration-damping fastener offers excellent vibration reduction and strong stability. It is also easy to install and disassemble, requiring no complex tooling or equipment, and facilitating future maintenance.

[0019] 3. In this solution, a lateral limiting stop is installed on the iron pad, which, in conjunction with a clamping lateral limiting block, effectively restrains the lateral displacement of the rail base when it is large. This improves the stability and safety of the fastener and also facilitates the replacement of the lateral limiting block laterally. The teeth at the bottom of the side stop contact the teeth on the upper surface of the iron pad, and the longitudinal limiting stops on both sides provide vertical support and lateral and longitudinal limiting functions for the side stop. Furthermore, in the initial state of fastener installation, a certain gap is set between the safety limiting pad (elastic structure) and the rail base. When the rail undergoes excessive vertical deformation, the safety limiting pad functions elastically to limit the vertical displacement of the rail. Attached Figure Description

[0020] Figure 1 A schematic diagram of the internal structure of a rail-braced vibration damping fastener system; Figure 2 This is a three-dimensional structural diagram of the rail-supported vibration damping fastener system in Example 1; Figure 3 This is a cross-sectional view of the rail-braced vibration damping fastener system in Example 1; Figure 4 This is a schematic diagram of the base plate in Example 1; Figure 5 This is a schematic diagram of the side guard in Example 1; Figure 6 This is a three-dimensional structural diagram of the rail-supported vibration damping fastener system in Example 2; Figure 7 This is a cross-sectional view of the rail-braced vibration damping fastener system in Example 2; Figure 8 This is a schematic diagram of the base plate in Example 2; Figure 9 This is a schematic diagram of the side baffle structure in Example 2; Figure 10 This is a front view of the vibration damping fastener in Example 3; Figure 11 This is a schematic diagram of the shoulder structure in Example 3; Figure 12 This is a schematic diagram of the bottom rail stop block in Example 3; Figure 13 This is a front view of the vibration damping fastener in Example 4; Figure 14This is a schematic diagram of the structure of the bottom rail stop in Example 4.

[0021] Figure 15 This is a schematic diagram of the shoulder structure in Example 4. The components are: 1-base plate, 2-rail, 3-shoulder, 4-rail bottom stop, 5-clamping slot one, 6-clamping part one, 7-clamping slot two, 8-clamping part two, 9-clamping slot three, 10-clamping part three, 11-elastic hook, 12-slot, 13-limiting part; 14-support leg, 15-placement slot, 16-insulating coupling pad, 17-safety limit pad. 18-Height adjustment pad; 19-Precast concrete block; 20-Side baffle; 21-Rubber wedge; 22-Vulcanized steel plate; 23-Resonant rod; 24-Tooth group; 25-Positioning groove; 26-Limiting teeth; 27-Limiting boss two; 28-Arc groove; 29-Arc rotating part; 30-Limiting boss one.

[0022] 101-Nylon sleeve, 102-Anchor bolt, 103-Heavy-duty spring washer, 104-Adjustable cover plate; 105-Flat washer, 106-Nut, 107-Locking bolt. Detailed Implementation

[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Existing floating rail vibration damping fasteners have the following problems: 1. Significant corrugation issues: Positioning wedges are prone to loosening or floating; rubber wedges provide insufficient lateral clamping to the rail, reducing lateral stability; spring clips are prone to breakage on-site, limiting their effectiveness. 2. Installation and disassembly require specialized tooling and high precision, making on-site installation difficult and requiring multiple personnel, resulting in slow progress. 3. Insufficient lateral restraint at the rail base leads to large lateral displacement and significant rail deflection, compromising structural strength, safety, and stability. To address these issues, the following products have been developed: Example 1 like Figure 1-5 A rail-supported vibration damping fastener system includes, from bottom to top, an insulating coupling pad 16, a base plate 1, and a safety limiting pad 17. The safety limiting pad is installed at the bottom of the rail 2. A placement groove 15 is installed in the middle of the base plate corresponding to the position of the safety limiting pad. The lower part of the safety limiting pad is embedded in the placement groove. In this embodiment, the safety limiting pad is made of natural rubber. An adjustable pad 18 can also be installed below the insulating coupling pad as needed. The base plate is installed on a precast concrete block 19 or a concrete foundation by an anchor bolt system. The specific anchor bolt system includes a nylon sleeve 101 installed in the precast concrete block, and an anchor bolt 102 screwed into the threaded part of the nylon sleeve. A heavy-duty spring washer 103 and an adjustable cover plate 104 are sequentially installed on the anchor bolt corresponding to the upper position of the base plate. The specific height adjustment method is described in the following construction process.

[0026] Side rail brackets 20 are movably installed on the base plate corresponding to the positions on both sides of the rail. Positioning grooves are installed on the base plate corresponding to the bottom positions of the side rail brackets. The top of the side rail brackets is bent inwards and abuts against the waist of the rail. Shoulders 3 are installed on the base plate corresponding to the bottom positions on both sides of the rail. The shoulders and the base plate form an installation groove for installing the rail. An elastic rail bottom stop 4 is installed at the contact point between the inner side of the shoulder and the bottom of the rail. A locking mechanism is installed between the rail bottom stop and the shoulder. A rubber wedge 21 is movably installed on the top of the side rail bracket 20. The side rail bracket and the rubber wedge... Vulcanized steel plates 22 are also installed between the blocks. The outer side of the rubber wedge blocks covers the rail web. Multiple resonant rods 23 are embedded in the rubber wedge blocks along the length of the rail. In this embodiment, there are three resonant rods 23, and their diameters decrease from top to bottom. The rail bottom block is made of glass fiber reinforced nylon 66 material. The side bracket has bolt holes in the middle. Locking bolts 107 are installed in the bolt holes from the bottom. Flat washers 105, heavy-duty spring washers, and nuts 106 are sequentially fitted on the locking bolts corresponding to the upper position of the side bracket.

[0027] As a preferred embodiment, the side support frame 20 is designed with three support legs 14 at the bottom that contact the base plate. Using the three support legs as support points can ensure the stability of the connection between the two.

[0028] As a connection method between the side guard and the base plate, the positioning groove is a limiting tooth groove. In this solution, a tooth group 24 is designed at the bottom of the side guard along the width direction of the rail. A limiting tooth 26 that cooperates with the tooth group is designed at the position corresponding to the positioning groove 25 on the base plate. A limiting boss 27 is also designed on the base plate at the positions corresponding to both sides of the side guard. By the contact between the teeth at the bottom of the side guard and the teeth in the longitudinal limiting tooth groove on the upper surface of the iron pad, the side guard is provided with vertical support and lateral limiting function. At the same time, the limiting tooth groove can also provide longitudinal limiting function for the side guard.

[0029] By setting a shoulder (lateral limiting stop) on the iron pad, and cooperating with the rail bottom stop that clamps the lateral limit, the rail bottom stop can effectively restrain the lateral displacement of the rail bottom when the rail bottom has a large lateral displacement. This improves the stability and safety of the fastener, and also facilitates the replacement of the lateral limiting stop in the future.

[0030] Example 2: As Figure 6-9 This embodiment mainly focuses on another form of side support and base plate, in which the bottom of the side support is rotatably mounted on the base plate. An arc-shaped rotating part 29 is installed at the bottom of the side support. An arc-shaped groove 28 for lateral limiting constraint is provided on the base plate at the corresponding positioning groove position. The arc-shaped groove and the arc-shaped rotating part cooperate with each other. Limiting bosses 30 are also installed on the base plate at the positions corresponding to both sides of the side support. In this embodiment, the main structure includes an iron pad, side support, rubber wedge, lateral limiting block, safety limiting pad, vulcanized steel plate, adjusting cover plate, insulating coupling pad, and pre-tightening bolt system. All components can be disassembled and replaced. The fastening system clamps the rubber wedge by rotating the side support and installing bolts, thereby providing effective lateral and vertical constraints for the rail. This rail-braced vibration damping fastener has excellent vibration damping effect and strong stability. It is also simple to install and disassemble, requiring no complex tooling equipment, and facilitating later maintenance.

[0031] Example 3: As Figure 10-12 This embodiment mainly focuses on the locking mechanism, one type of locking mechanism is as follows: a locking groove 5 is provided at the bottom of the inner side of the shoulder along the length of the rail, and a locking part 6 that cooperates with the locking groove 6 is installed on one side of the rail bottom block. A locking groove 7 is provided on the locking part 7, and a locking part 8 that cooperates with the locking groove 7 is installed in the locking groove 7. A T-shaped locking is formed between the rail bottom block and the shoulder. During installation, the rail bottom block needs to be installed on the shoulder first, and then the rail is placed between the rail bottom blocks on both sides to achieve the constraint of the rail bottom.

[0032] Example 4: Figure 13-15This embodiment mainly focuses on the locking mechanism. Another locking mechanism is as follows: a locking groove 39 is provided at the bottom of the inner side of the shoulder along the length of the rail. A locking part 30 that cooperates with the locking groove 39 is installed on one side of the rail bottom block. An elastic hook 11 is installed on the locking part 310 along the length of the rail. The locking end of the elastic hook 11 is installed facing the shoulder. A groove 12 that cooperates with the elastic hook is installed at one end of the inner side of the locking groove 3. Unlike the installation method in Embodiment 1, when using this rail bottom block, the rail can be placed on the base plate first, and then the rail bottom block can be embedded between the shoulder and the rail from the side. This allows for quick installation of the rail bottom block while ensuring a tight fit between the two. The elastic hook can prevent the rail bottom block from detaching from the shoulder during use.

[0033] As a preferred embodiment, a limiting part is installed on one end of the outer side of the rail bottom block to limit the installation position of the rail bottom block on the shoulder. The limiting part can ensure that the rail bottom block is installed in place and ensure the lateral limiting effect on the rail.

[0034] This product is applicable to both ballastless and ballasted track beds. The construction process for this product is as follows: Step (1): Pre-embed nylon sleeves: First, pre-embed the special nylon sleeves into the precast concrete base (precast block) according to the design hole spacing requirements, cure for more than 48 hours, and perform post-treatment as required. When pre-embedding the nylon sleeves, in order to prevent impurities from entering the sleeves and affecting the fastener fixing, it is recommended that after the nylon sleeves are pre-embedded, a plastic (or other material) cap (plug) should be added to prevent rainwater and mud from entering. In this step, for precast concrete slabs, the pre-embedded nylon sleeves (or after drilling) can be used to directly anchor with bolts; for cast-in-place concrete slabs, plastic or iron sleeves can be cast in to be used with bolts or screws.

[0035] Step (2): Connecting the base plate to the precast concrete block. First, ensure the sleeper surface is clean. Place the insulating coupling pad and the base plate (with the locking bolts passing through the bottom of the base plate) onto the sleeper or rail support platform in sequence. Then, place the adjusting cover plate on the corresponding position of the base plate. Align the bolt holes of the base plate, the insulating coupling pad, and the adjusting cover plate with the pre-embedded nylon sleeve holes on the sleeper. After putting heavy-duty spring washers on the anchor bolts, tighten them manually or mechanically to the specified preload. The bolt torque should be 150-200 N·m.

[0036] Step (3): Place the anti-collision pads in the pre-reserved grooves designed on the base plate.

[0037] Step (4): Install rail bottom blocks. When using T-slot type rail bottom blocks, install the four rail bottom blocks on the four shoulders of the base plate in sequence. This step must be carried out before the rail is installed. When using another type of snap-on type rail bottom blocks, the rail bottom blocks can be installed in the last process. The specific installation time depends on the type of rail bottom blocks selected.

[0038] Step (5): Place the rails on the anti-collision pads, ensuring that the two rail feet are firmly attached to the rail base blocks on both sides. During rail placement, maintain the correct installation position of the rail base blocks to prevent them from flipping or falling off. Step (6): Install rubber wedges and side brackets. First, install two rubber wedges on two side brackets respectively. The two concave holes on the back of the rubber wedges match the two protrusions on the side brackets. Hold the combination of rubber wedges and side brackets by hand and install the rubber wedges on the rail webs on both sides of the rail from top to bottom. The locking bolts pass through the pre-reserved bolt holes in the middle of the side brackets. The rubber wedges fit tightly against the rail webs. The rotating shaft at the end of the side brackets falls into the pre-reserved groove in the base plate. Step (7): Lock the side bracket. Install the flat washer, heavy-duty spring washer, and nut onto the locking bolt in sequence. Tighten the nut using a manual torque wrench or a mechanical torque wrench. Nut tightening torque control: For straight sections and curves with a radius ≥800m, the torque should be controlled at 60-100 N·m; for other sections, the torque should be controlled at 100-125 N·m. Note: The two nuts on both sides of the rail must be tightened simultaneously with two wrenches, or tightened in stages using a single wrench. Do not tighten directly on one side, and the tightening torque of the nuts on both sides should be consistent. After installation, check whether the rail has tilted and whether the rubber wedge is in close contact with the rail web. If the rail has obvious tilt or the rubber wedge has a large gap, it must be disassembled and reinstalled.

[0039] Step (8): Pour the track bed concrete. Use concrete to pour the precast concrete blocks and the ground together to form the track bed.

[0040] Step (9): Welding the rails. When welding the rails, first remove the rail bracing damping fasteners at the weld joint of the two rails. After the two rails are brought together and welded, grind the weld joint and then install the rail bracing damping fasteners.

[0041] The rail-braced vibration damping fastener features adjustable gauge. Furthermore, it allows for ±8mm gauge adjustment without disassembling the side support (without disrupting the locking state of the rubber wedges). The procedure is as follows: First, remove the anchor bolts; then, move the entire fastener to the desired adjustment position; finally, reinstall the anchor bolts.

[0042] The height adjustment function of rail-braced vibration damping fasteners is useful when track unevenness occurs or height differences exist between fasteners, requiring adjustment. This can be achieved by laying matching under-slab height adjustment shims. The under-slab height adjustment shims are installed between the insulating coupling shim and the sleeper. According to design requirements, the height adjustment range is 0mm to +30mm, with adjustment intervals of 1mm. The height adjustment shims are available in seven thicknesses: 1mm, 2mm, 3mm, 5mm, 8mm, 10mm, and 20mm. Different thicknesses of shims can be stacked to achieve different height adjustments, with a maximum adjustment of 30mm. The height adjustment steps are as follows: Remove the spring clips and anchor bolts using specialized tools, lift the rail, place the height adjustment shim in the correct position, lower the rail, and install the anchor bolts to achieve the height adjustment.

[0043] The existing rail bracing vibration damping fasteners include the first-generation Vanguard fastener, the second-generation product which adds vertical and longitudinal limiting (spring clip) to the side baffle based on the first-generation product, and the third-generation product which removes the spring clip limiting device and adds T-bolt vertical limiting based on the second-generation product.

[0044] The solution designed in this invention mainly addresses the shortcomings of the aforementioned existing products: 1. Solve the technical problem of corrugation control in floating rail type vibration damping fastener products. The corrugated wear of rails occurs almost 100% on small-radius curves, directly causing failure of track and vehicle components. The current measure is grinding and repair. Studies have shown that improving the lateral stability of rails can effectively suppress the development of rail corrugation. The reasons for insufficient lateral stability of rails are: (1) Insufficient rail bottom limit: Due to its structural characteristics, the elastic element of the floating rail vibration damping fastener cannot sink with the rail when it sinks. The constraint at the top of the rail web is strengthened, while the constraint at the bottom of the rail web is weakened. The rail bottom constraint is insufficient, and the rail bottom swing amplitude is large; (2) Loose locking structure: This will cause the bottom of the side guard to slide laterally, causing it to deflect and swing; the positioning wedge is easy to loosen and float, and the constraint fails. In response to the above problems, this invention adopts the following: rail bottom swing - setting a rail bottom limit structure to effectively suppress rail bottom swing; side guard lateral slip - side guard bottom lateral limit; positioning wedge floating and loosening - the side clamping constraint of the positioning wedge is improved to the top bolt constraint, which is more stable.

[0045] The rail-braced vibration damping fastener proposed in this invention is suitable for high-level vibration-damping sections of urban rail transit. This fastener uses two side supports to clamp two rubber wedges to both sides of the rail, and locks the side supports to the base plate using locking bolts, achieving both vertical support and lateral restraint for the rail. By laterally compressing the rubber wedges and maximizing their shear characteristics, it achieves high lateral stiffness and low vertical stiffness. Furthermore, this vibration damping fastener optimizes the side support locking structure, employing a simple bolt locking method. This not only simplifies the construction and installation process but also ensures complete locking of the side supports, effectively preventing loosening during later operation.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rail-braced vibration damping fastener system, comprising, from bottom to top, an insulating coupling pad, a base plate, and a safety limiting pad, wherein the safety limiting pad is disposed at the bottom of the rail, and side stops are movably disposed on the base plate corresponding to the two sides of the rail, characterized in that: The base plate is provided with a positioning groove at the bottom position of the side guard. The top of the side guard is bent inward and abuts against the waist of the rail. Shoulders are provided on the base plate at the bottom positions of both sides of the rail. The shoulders and the base plate form an installation groove for installing the rail. An elastic rail bottom block is provided at the contact position between the inner side of the shoulder and the bottom of the rail. A locking mechanism is provided between the rail bottom block and the shoulder. The locking mechanism is as follows: a locking groove three is provided at the bottom inner side of the shoulder along the length of the rail; a locking part three is provided on one side of the rail bottom block to cooperate with the locking groove three; an elastic hook is provided on the locking part three along the length of the rail; the locking end of the elastic hook faces the shoulder; and a groove is provided at one end of the locking groove three to cooperate with the elastic hook. One end of the outer side of the rail bottom block is provided with a limiting part for restricting the installation position of the rail bottom block on the shoulder; A rubber wedge is movably installed on the top of the side guard. A vulcanized steel plate is also installed between the side guard and the rubber wedge. The outer side of the rubber wedge covers the web of the rail. Multiple resonant rods are embedded in the rubber wedge along the length of the rail. The bottom of the side guard is rotatably mounted on the base plate. The bottom of the side guard has an arc-shaped rotating part. The base plate has an arc-shaped groove for lateral limiting constraint at the position of the side guard. The arc-shaped groove and the arc-shaped rotating part cooperate with each other. The base plate also has a limiting boss at the position of the two sides of the side guard. The middle of the side guard has a bolt hole. The middle of the side guard is connected to the base plate by a pre-tightening bolt installed in the bolt hole.

2. The rail-supported vibration damping fastener system according to claim 1, characterized in that: The side support frame has three feet at its bottom that contact the base plate.

3. The rail-supported vibration damping fastener system according to claim 1, characterized in that: The rail bottom block is made of glass fiber reinforced nylon 66 material, and a placement groove is provided in the middle of the base plate corresponding to the position of the safety limit pad.

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