Anti-flutter grid expansion device and bridge expansion joint structure
By designing an anti-undulation grid expansion joint, the problem of poor expansion performance of bridge expansion joints under temperature and load was solved, thereby improving the stability of the bridge structure and the safety of traffic.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENGSHUI XIANGXIN TRANSPORTATION TECH CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-08-04
AI Technical Summary
Existing bridge expansion joints have poor expansion and contraction performance under temperature changes or loads, and are prone to jamming and vehicle bouncing, which can lead to structural damage, affect service life and driving comfort.
An anti-undulation mesh expansion device is adopted, including anchors, expansion panels and anti-undulation components. The expansion panels can be flexibly deformed through sliding adapters and anti-undulation fastening connecting rods, and waterproof function is provided in combination with waterstops.
It improves the adaptability and stability of bridge expansion joints, reduces structural damage, extends service life, and ensures smooth and safe driving.
Smart Images
Figure CN224591310U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge technology, and in particular to an anti-undulation grid expansion joint device and a bridge expansion joint structure. Background Technology
[0002] Bridge expansion joints are a crucial component in the construction and operation of bridge engineering. During bridge construction, factors such as changes in environmental climate and temperature, stress expansion and contraction deformation of bridge reinforced concrete and other building materials, and impact from vehicle loads can cause the bridge structure to undergo expansion and contraction displacement deformation.
[0003] Existing expansion joint devices include a comb-shaped structure with bolts fixed to the expansion joint of a bridge.
[0004] The applicant has discovered that the existing technology has at least the following technical problems: Traditional expansion joints have a single expansion structure, making it difficult to achieve smooth expansion and contraction when there are significant temperature changes or large displacements of the bridge under load. This can easily lead to jamming, and over time, the expansion joint will lose its expansion function and damage itself and the bridge connection structure, affecting the overall service life of the bridge. Furthermore, expansion joints have poor resistance to undulations. When vehicles drive over the bridge expansion joints during significant temperature changes or large displacements of the bridge under load, the poor resistance to undulations can easily cause vehicles to bounce, affecting driving comfort and generating additional impact loads on the expansion joint and bridge structure, accelerating their damage and increasing maintenance costs. Utility Model Content
[0005] The purpose of this utility model is to provide an anti-undulation mesh expansion joint device and a bridge expansion joint structure to solve the technical problems of poor expansion performance and poor anti-undulation performance of existing bridge expansion joints. The various technical effects of the preferred technical solutions provided by this utility model are described in detail below.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] The anti-undulation mesh expansion device provided by this utility model includes anchors, expansion panels, and anti-undulation components, wherein:
[0008] The anchors are fixed to the opposite sides of the expansion joint panel to be fixedly connected to the bridge body on both sides of the expansion joint; the expansion joint panel is provided with a plurality of expansion displacement holes.
[0009] The anti-undulation component includes a sliding adapter, an anti-undulation fastening connecting rod, and a base. The base is fixed to the bottom of the telescopic panel, and the anti-undulation fastening connecting rod is fixedly connected to the telescopic panel. The base is provided with a sliding groove, and the anti-undulation fastening connecting rod is connected to the base through the sliding adapter. Under the action of external force, the sliding adapter is slidably positioned within the sliding groove, and the anti-undulation fastening connecting rod is rotatable relative to the base.
[0010] Preferably, the telescopic displacement holes are spaced apart along the length and / or width direction of the telescopic panel.
[0011] Preferably, the sliding adapter includes a spherical sliding bearing, and the anti-undulation fastening connecting rod includes an end head and a rod body, wherein:
[0012] The spherical sliding bearing has an inner ring and an outer ring. The rod passes through the inner ring and is fixedly connected to the inner ring. The outer ring is located in the groove and is slidable under the action of external force.
[0013] The outer diameter of the end head is larger than the outer diameter of the rod body. A T-slot is provided on the telescopic panel. The rod body passes through the T-slot, and the end head is confined within the T-slot for pulling the telescopic panel downward.
[0014] Preferably, the telescopic displacement holes and the T-slots are arranged alternately along the length or width of the telescopic panel.
[0015] Preferably, the axis of the telescopic displacement hole and the axis of the T-slot are parallel to each other.
[0016] Preferably, the upper surface of the telescopic panel is provided with anti-slip grooves.
[0017] Preferably, the number of anti-slip grooves is one or more, and the depth of the anti-slip grooves is less than 1 / 2 the thickness of the telescopic panel.
[0018] Preferably, the anti-undulation mesh expansion joint further includes a waterstop, which comprises a stainless steel support plate and a drainage channel, wherein:
[0019] The two stainless steel support plates are respectively fixedly connected to the opposite sides of the drainage channel. The stainless steel support plates are horizontal and are respectively fixed to the corresponding anchors.
[0020] One of the stainless steel support slide plates is clamped and fixed between the telescopic panel and the base, and the anti-undulation fastening connecting rod passes through the corresponding stainless steel support slide plate.
[0021] Preferably, the cross-section of the drainage channel is U-shaped or V-shaped, and the opening of the drainage channel faces the telescopic panel.
[0022] This utility model provides a bridge expansion joint structure, including an expansion joint and the aforementioned anti-undulation mesh expansion device located at the expansion joint.
[0023] Compared with existing technologies, the anti-undulation mesh expansion joint device and bridge expansion joint structure provided by this utility model have the following beneficial effects: When the bridge structure undergoes expansion and contraction deformation due to factors such as temperature changes, concrete shrinkage, and vehicle load impact, the expansion displacement hole increases or decreases, providing clearance for the expansion panel's expansion and contraction. This better meets the various complex expansion and contraction deformation requirements of the bridge and reduces damage to the bridge structure caused by limited expansion and contraction. When the expansion panel warps, the anti-undulation fastening connecting rod pulls the expansion panel downward, applying an effective vertical constraint force to the expansion panel under vehicle load, thereby significantly suppressing the undulation and warping of the expansion panel and ensuring smooth and safe driving. At the same time, when the expansion panel deforms, the sliding transition piece within the anti-undulation component can slide and rotate, allowing the entire device to flexibly adapt to the complex expansion and contraction deformation of the bridge in the horizontal and angular directions. This avoids stress concentration and structural jamming caused by inconsistent deformation, improving the operational stability and service life of the device. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of the anti-undulation mesh expansion joint in the first embodiment;
[0026] Figure 2 This is a top view of the anti-undulation mesh scaling device in the first embodiment;
[0027] Figure 3 This is a partial top view of the anti-undulation mesh scaling device in the first embodiment;
[0028] Figure 4 It is a longitudinal sectional view of the anti-undulation component in conjunction with the expansion joint panel and waterstop.
[0029] Figure 5 This is a side view of the waterstop.
[0030] Figure 6This is a partial top view of the anti-undulation mesh scaling device in the second embodiment;
[0031] Figure 7 This is a partial top view of the anti-undulation mesh scaling device in another embodiment;
[0032] Figure 8 This is a partial top view of the anti-undulation mesh scaling device in the other embodiments.
[0033] In the diagram: 1. Telescopic panel; 11. Telescopic displacement hole; 12. T-slot; 13. Anti-slip groove; 2. Anti-undulation component; 21. Sliding adapter; 211. Inner ring; 212. Outer ring; 22. Anti-undulation fastening connecting rod; 221. End head; 222. Rod body; 23. Base; 231. Slide groove; 3. Anchor; 4. Waterstop; 41. Stainless steel support slide plate; 42. Drainage groove; 5. Expansion joint. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0035] In the description of this utility model, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0036] In the description of this utility model, 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 utility model based on the specific circumstances.
[0037] This utility model provides an anti-undulation grid expansion joint device that can better meet the various complex expansion and contraction requirements of bridges, avoid stress concentration and structural jamming caused by deformation incoordination, and improve the operational stability and service life of the device.
[0038] The following is combined with Figures 1-8 The technical solution provided by this utility model will be described in more detail.
[0039] Example 1:
[0040] like Figures 1-5 As shown, the anti-undulation grid expansion joint provided by this utility model is installed as a whole at the bridge expansion joint 5 reserved between the ends of the bridge beams to bridge the expansion joint 5, thereby forming a continuous and smooth bridge deck and adapting to the displacement of the bridge caused by factors such as temperature changes, load, and concrete shrinkage and creep. The anti-undulation mesh expansion joint includes anchors 3, expansion panels 1, and anti-undulation components 2. Anchors 3 are fixed to opposite sides of the expansion panel 1 for fixed connection with the bridge body on both sides of the expansion joint 5. The expansion panel 1 is provided with multiple expansion displacement holes 11. The anti-undulation component 2 includes a sliding adapter 21, an anti-undulation fastening connecting rod 22, and a base 23. The base 23 is fixed to the bottom of the expansion panel 1, and the anti-undulation fastening connecting rod 22 is fixedly connected to the expansion panel 1. The base 23 is provided with a groove 231. The anti-undulation fastening connecting rod 22 is connected to the base 23 through the sliding adapter 21. Under the action of external force, the sliding adapter 21 is slidably positioned within the groove 231, and the anti-undulation fastening connecting rod 22 is rotatable relative to the base 23.
[0041] Anchor 3 is used to firmly fix the anti-undulation bridge expansion joint to the beam structure on both sides of the bridge expansion joint 5, providing stable and reliable support for the entire device. In one embodiment of this application, anchor 3 is an anchor plate. These anchor plates are typically made of high-strength structural steel (e.g., Q345qD or equivalent bridge-specific steel), possessing sufficient rigidity and strength. During installation, the anchor plate is fastened to the embedded steel plate or concrete structure at the end of the bridge beam using multiple high-strength bolts. In some implementations, the anchor plate can also be used in conjunction with pre-embedded anchoring steel bars or chemical anchors to ensure that the device will not loosen or shift under long-term vehicle impact loads and bridge deformation stress, thereby ensuring the safety and durability of the overall structure.
[0042] The telescopic panel 1 is a component that directly bears the wheel pressure of vehicles. Its top forms a load-bearing surface that is flush with the pavement layers on both sides of the bridge to ensure smooth driving.
[0043] To accommodate the expansion and contraction of the bridge, the expansion joint panel 1 is equipped with a deformation-adaptive structure. Its function is to dissipate the displacement through the panel's own elasticity or geometric deformation, thereby preventing excessive tensile or compressive stress within the panel. In this embodiment, as... Figure 2 and Figure 3 As shown, the aforementioned deformation adaptation structure specifically comprises multiple expansion displacement holes 11 penetrating the expansion panel 1. The shape of the expansion displacement holes 11 can be circular, elliptical, or elongated. When the bridge expansion joint 5 widens, the geometry of the holes changes accordingly; for example, elliptical holes are stretched into polygons, thereby absorbing the tensile deformation of the panel; conversely, the holes are compressed. This design enables the entire expansion panel 1 to achieve expansion and contraction on a macroscopic scale. Correspondingly, two symmetrical, triangular-like structures are presented to automatically clear road debris blocking the expansion mesh, preventing the expansion device from losing its expansion function. The expansion panel 1 itself is typically made of high-strength, high-toughness alloy steel to ensure sufficient fatigue life under high-frequency vehicle loads and repeated deformation.
[0044] As an optional implementation, see Figure 2 , Figure 3 As shown, the telescopic displacement holes 11 are spaced apart along the length and / or width of the telescopic panel 1.
[0045] In this embodiment, the anti-undulation grid expansion device can increase or decrease the expansion displacement hole 11 when the bridge structure undergoes expansion and contraction deformation due to factors such as temperature changes, concrete shrinkage, and vehicle load impact. This provides space for the expansion and contraction of the expansion panel 1, better meeting the various complex expansion and contraction deformation requirements of the bridge and reducing damage to the bridge structure caused by limited expansion and contraction.
[0046] When the telescopic panel 1 warps and deforms, the anti-undulation fastening connecting rod 22 pulls the telescopic panel 1 downward, which can apply an effective vertical constraint force to the telescopic panel 1 under vehicle load, thereby significantly suppressing the undulation and warping of the telescopic panel 1 and ensuring smooth and safe driving. At the same time, when the telescopic panel 1 deforms, the sliding adapter 21 in the anti-undulation component 2 can slide and rotate, so that the entire device can flexibly adapt to the complex deformation of the bridge in the horizontal and angular directions, avoiding stress concentration and structural jamming caused by deformation incoordination, and improving the operational stability and service life of the device.
[0047] As an optional implementation, see Figure 1 and Figure 4As shown, the sliding adapter 21 includes a spherical sliding bearing, and the anti-undulation fastening connecting rod 22 includes an end head 221 and a rod body 222. The spherical sliding bearing has an inner ring 211 and an outer ring 212. The rod body 222 passes through the inner ring 211 and is fixedly connected to the inner ring 211. The outer ring 212 is located in the sliding groove 231 and is slidable under the action of external force. The outer diameter of the end head 221 is larger than the outer diameter of the rod body 222. A T-slot 12 is provided on the telescopic panel 1. The rod body 222 passes through the T-slot 12, and the end head 221 is limited to the T-slot 12 for pulling the telescopic panel 1 downward.
[0048] The T-slot 12 has a cross-section that is wider at the top and narrower at the bottom, meaning that the width of its opening on the top surface of the telescopic panel 1 is greater than the width of its internal cavity. This geometry, combined with the anti-undulation fastening connecting rod 22, is key to achieving vertical positioning of the telescopic panel 1.
[0049] See Figure 1 As shown, in the anti-undulation component 2, the base 23 serves as the fixed foundation for the anti-undulation component 2 and is firmly set below the telescopic panel 1, for example, by bolts or welding to the anchor plate, or fixed to other pre-set support structures on the bridge beam. The base 23 is usually welded from cast steel or high-strength steel plates and has sufficient rigidity. A groove 231 extending laterally along the bridge (i.e., in the direction of telescopic displacement) is provided on its upper surface. The cross-section of the groove 231 can be rectangular, trapezoidal, or dovetail-shaped, and its inner surface is precision-machined to ensure a low coefficient of friction and good guiding properties, facilitating sliding connection with the sliding adapter 21 through the groove 231.
[0050] See Figure 4 As shown, the upper end of the anti-undulation fastening connecting rod 22 has a large-diameter end head 221. Specifically, the end head 221 is fixed inside the T-slot 12. During assembly, the rod body 222 of the anti-undulation fastening connecting rod 22 passes through the narrow opening of the T-slot 12 on the telescopic panel 1, while its end head 221 is accommodated in the wide inner cavity of the T-slot 12. Because the diameter of the end head 221 is larger than the opening width of the T-slot 12, the anti-undulation fastening connecting rod 22 cannot be dislodged from the T-slot 12. When the telescopic panel 1 is subjected to an upward lifting force or warping deformation, the upper surface of the end head 221 will abut against the top surface of the inner cavity of the T-slot 12, thereby applying a downward pulling force to the telescopic panel 1 through the anti-undulation fastening connecting rod 22, effectively suppressing its vertical displacement.
[0051] See Figure 4As shown, the sliding adapter 21 (spherical sliding bearing) is used to connect the lower end of the anti-undulation fastening connecting rod 22 to the base 23. The spherical sliding bearing includes an inner ring 211 and an outer ring 212 (not shown in the prior art), with a conformal spherical contact surface between the inner and outer rings 212. Its inner ring 211 is fixedly connected to the lower end of the anti-undulation fastening connecting rod 22, while its outer ring 212 is installed in the groove 231 of the base 23.
[0052] This structure enables two key degrees of freedom to fully adapt to various deformations of the bridge, protecting the bridge structure and expansion joint from damage caused by deformation restriction and extending the service life of the bridge and the joint: First, when the bridge undergoes lateral expansion and contraction, the entire outer ring 212 of the spherical sliding bearing will slide along the sliding track of the base 23 to adapt to horizontal displacement; Second, when the expansion panel 1 flexes or twists due to thermal expansion and contraction, causing the expansion panel 1 to produce angular displacement, the inner ring 211 of the spherical sliding bearing can rotate omnidirectionally relative to its outer ring 212 to adapt to angular changes in any direction, thereby coordinating the internal stress of the expansion panel 1.
[0053] As an optional implementation, see Figure 2 and Figure 3 As shown, the telescopic displacement holes 11 and T-slots 12 are arranged alternately along the length or width of the telescopic panel 1. The axes of the telescopic displacement holes 11 and the axes of the T-slots 12 are parallel to each other.
[0054] As an optional implementation, see Figures 1-3 As shown, to improve driving safety in rainy and snowy weather conditions, the upper surface of the telescopic panel 1 is provided with anti-slip grooves 13. The number of anti-slip grooves 13 is one or more, and the depth of the anti-slip grooves 13 is less than 1 / 2 the thickness of the telescopic panel 1.
[0055] like Figure 2 and Figure 3 As shown, the anti-slip groove 13 can be a straight groove along the transverse or longitudinal direction of the bridge, or a cross-shaped grid groove. The depth and width of the anti-slip groove 13 are designed, for example, its depth is usually less than half the thickness of the telescopic panel 1, in order to ensure the anti-slip effect without significantly weakening the overall cross-sectional strength of the panel.
[0056] As an optional implementation, see Figure 1 and Figure 5As shown, the anti-undulation mesh telescopic device also includes a waterstop 4, which includes a stainless steel support plate 41 and a drainage channel 42. The two stainless steel support plates 41 are fixedly connected to opposite sides of the drainage channel 42. The stainless steel support plates 41 are horizontal and are fixed to the corresponding anchors 3. One of the stainless steel support plates 41 is clamped and fixed between the telescopic panel 1 and the base 23. The anti-undulation fastening connecting rod 22 passes through the corresponding stainless steel support plate 41.
[0057] The waterstop 4 spans the entire bridge expansion joint 5. Its main function is to collect water that seeps from the gaps in the expansion panel 1 and drain it in an organized manner to prevent moisture from penetrating into the bridge expansion joint 5, thereby protecting the underlying bridge structure and anti-undulation components 2 from corrosion.
[0058] As a preferred option, the waterstop 4 is made of stainless steel material with excellent corrosion resistance (such as 304 or 316L stainless steel). Compared with the traditional rubber waterstop 4, it has the advantages of anti-aging, wear resistance, and is not easily punctured by debris, and has a longer service life.
[0059] In this embodiment, as Figure 5 As shown, it includes a central V-shaped drainage channel 42 (or a U-shaped drainage channel 42) and two horizontal stainless steel support plates 41 on both sides. The V-shaped structure gives it good elastic deformation capability. When the width of the expansion joint 5 changes, the V-shaped channel can open or close accordingly, always maintaining effective waterproof function. The stainless steel support plates 41 on both sides are used for installation and fixation, and are pressed between the expansion panel 1 and the base 23, achieving reliable sealing and fixation by fasteners or welding.
[0060] The working process of this embodiment is as follows:
[0061] Firstly, it has an anti-vertical undulation function. When the vehicle wheel pressure acts on the telescopic panel 1, especially at its edge, it is easy to generate a torque that causes it to warp and lift. At this time, the end head 221 of the anti-undulation fastening connecting rod 22 will abut against the inner top surface of the T-slot 12. Through the anti-undulation fastening connecting rod 22, the spherical sliding bearing and the base 23, the lifting force is transmitted to the stable plate, forming a reverse constraint, thereby constraining the telescopic panel 1 in the preset position and effectively suppressing the "jumping" phenomenon.
[0062] Secondly, it adapts to horizontal expansion and contraction: when the expansion and contraction panel 1 expands and contracts due to temperature changes, the expansion and contraction displacement hole 11 on the expansion and contraction panel 1 will deform accordingly to coordinate the stress inside the panel.
[0063] Third, the function of adapting to angular displacement: when the bridge twists or the beam ends rotate due to uneven loads or foundation settlement, the inner ring 211 rotates at a corresponding angle relative to the outer ring 212, thereby releasing the constraint stress caused by the rotation, avoiding stress concentration at the connection, and preventing the expansion joint panel 1 from breaking.
[0064] Fourth, waterproof function: Water from the bridge deck flows through the gaps in the expansion joint panel 1 into the V-shaped stainless steel waterstop 4 below, is collected by the drainage channel 42, and is discharged along the drainage slope of the bridge to the designated drainage outlet, thus achieving durable and reliable waterproof protection.
[0065] Example 2
[0066] The difference between this embodiment and Embodiment 1 is that the number of anti-slip grooves 13 and telescopic displacement holes 11 on the telescopic panel 1 is different.
[0067] Example 3
[0068] See Figure 1 As shown, this embodiment provides a bridge expansion joint structure, including an expansion joint 5 and the aforementioned anti-undulation mesh expansion device located at the expansion joint 5.
[0069] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.
[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0071] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. An anti-flutter grid expansion device, characterized in that, Includes anchors, telescopic panels, and anti-undulation components, among which: The anchors are fixed to the bottom opposite sides of the expansion joint panel for fixed connection with the bridge beams on both sides of the expansion joint; the expansion joint panel is provided with multiple expansion displacement holes. The anti-undulation component includes a sliding adapter, an anti-undulation fastening connecting rod, and a base. The base is fixed to the bottom of the telescopic panel, and the anti-undulation fastening connecting rod is fixedly connected to the telescopic panel. The base is provided with a sliding groove, and the anti-undulation fastening connecting rod is connected to the base through the sliding adapter. Under the action of external force, the sliding adapter is slidably positioned within the sliding groove, and the anti-undulation fastening connecting rod is rotatable relative to the base.
2. The anti-flutter grid expansion device of claim 1, wherein, The telescopic displacement holes are spaced apart along the length and / or width of the telescopic panel.
3. The anti-flutter grid expansion device of claim 1, wherein, The sliding adapter includes a spherical sliding bearing, and the anti-undulation fastening connecting rod includes an end head and a rod body, wherein: The spherical sliding bearing has an inner ring and an outer ring, the rod passes through the inner ring and is fixedly connected to the inner ring, and the outer ring is located in the groove and is slidable under the stress of the bridge. The outer diameter of the end head is larger than the outer diameter of the rod body. A T-slot is provided on the telescopic panel. The rod body passes through the T-slot, and the end head is confined within the T-slot for pulling the telescopic panel downward.
4. The anti-flutter grid retraction device of claim 3, wherein, The telescopic displacement holes and the T-slots are arranged alternately along the length or width of the telescopic panel.
5. The anti-undulation mesh expansion device according to claim 3, characterized in that, The axis of the telescopic displacement hole and the axis of the T-slot are parallel to each other.
6. The anti-undulation mesh expansion device according to claim 1, characterized in that, The upper surface of the cover seam end of the telescopic panel is provided with a concave anti-slip groove.
7. The anti-undulation mesh expansion device according to claim 6, characterized in that, The number of anti-slip grooves is one or more.
8. The anti-undulation mesh expansion device according to claim 1, characterized in that, The anti-undulation mesh expansion joint also includes a waterstop strip, which comprises a stainless steel support plate and a drainage channel, wherein: The two stainless steel support slide plates are respectively fixedly connected to the opposite sides of the drainage channel. The stainless steel support slide plates are horizontal and are respectively fixed to the corresponding anchors. One of the stainless steel support slide plates is clamped and fixed between the telescopic panel and the base, and the anti-undulation fastening connecting rod passes through the corresponding stainless steel support slide plate.
9. The anti-undulation mesh expansion device according to claim 8, characterized in that, The drainage channel has a U-shaped or V-shaped cross-section, and the opening of the drainage channel faces the telescopic panel.
10. A bridge expansion joint structure, characterized in that, Includes an expansion joint and an anti-undulation mesh expansion device as described in any one of claims 1-9 located at the expansion joint.