Wind-resistant damping device for bridge suspender
By installing disc-shaped vibration damping devices on bridge suspenders, the principle of inertia and streamlined structure are used to suppress wind-induced vibrations, solving the problem of wind resistance and lifespan of suspenders under wind-induced vibrations, and improving safety and durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CCCC HIGHWAY CONSULTANTS CO LTD
- Filing Date
- 2024-09-02
- Publication Date
- 2026-07-14
AI Technical Summary
Regarding the issue of wind-induced vibration in existing bridge suspenders, existing damping devices either increase the wind-exposed area of the suspenders or reduce their tensile capacity, resulting in reduced wind resistance and lifespan.
A disc-shaped body is used as a shock absorption device to suppress wind-induced vibration of the boom through the principle of inertia. The disc-shaped body is made of high-density material and is connected to the top of the boom and the arch or bridge tower. The streamlined structure and the inertia of the steel cable reduce displacement and vibration amplitude, and the direction of swaying is indicated by striking bells made of different timbre materials.
It effectively reduces the vibration amplitude at the connection between the top of the gantry and the arch or bridge tower, enhances wind resistance, extends the service life of the gantry, and provides audible cues for safe driving.
Smart Images
Figure CN118880722B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of bridge technology, specifically a wind-resistant and vibration-damping device for bridge hangers. Background Technology
[0002] In recent years, my country has extensively used slender, upright members as rigid hangers in its large-span arch bridges and steel truss arch bridges, with common cross-sectional shapes including cylindrical, circular, H-shaped, and rectangular. With technological advancements, the span of arch bridges has increased significantly, leading to a corresponding increase in hanger length. This makes them more susceptible to wind-induced vibrations, resulting in varying degrees of damage to bridge components. Cylindrical hangers, with their aesthetically pleasing design, good load-bearing capacity, and ease of fabrication, are increasingly being used in large-span arch bridges and steel truss arch bridges. However, as large-volume structures, cylindrical hangers are prone to wind-induced vibrations. Controlling these vibrations can reduce damage to bridge components and ensure the overall structural safety of the bridge.
[0003] In existing technologies, dampers are installed on the boom or damping structures are placed inside the boom. While installing dampers reduces vibration through energy conversion, it increases the wind-exposed area of the boom, thus increasing its susceptibility to wind and offsetting its wind resistance. On the other hand, placing damping structures inside the boom makes it hollow, reducing its tensile capacity. Although this reduces vibration, it also reduces the boom's lifespan and maximum load-bearing capacity, making it less practical. Summary of the Invention
[0004] To address the aforementioned problems, the present invention aims to provide a wind-resistant and vibration-damping device for bridge suspenders, which uses the principle of inertia to dampen the vibration of the suspenders.
[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A wind-resistant and shock-absorbing device for bridge suspenders includes a disc-shaped body made of high-density material. The disc-shaped body has collars on all four sides, and steel cables are attached to the collars. The steel cables are fixed to the connection between the top of the suspender and the arch or bridge tower. The upper and lower surfaces of the disc-shaped body are both streamlined and smooth.
[0006] The above scheme achieves the following beneficial effects: the disc-shaped body is suspended at the connection between the top of the suspender and the arch or bridge tower. The disc-shaped body has a high density, so it has a smaller wind-receiving surface and a smaller displacement under the action of the wind field. The upper and lower surfaces of the disc-shaped body are both streamlined and smooth, which further enhances the wind guiding ability, so that the wind is guided away by the streamlined structure, reducing the displacement under the action of the wind field, and making the displacement speed of the disc-shaped body and the connection between the top of the suspender and the arch or bridge tower different.
[0007] When vibration occurs, the steel cable connecting the top of the gantry to the arch or bridge tower causes the disc-shaped object to sway along with this connection. However, due to its better wind resistance and larger mass, the disc's velocity and acceleration are significantly lower than those at the connection. Therefore, the disc's inertia resists displacement, allowing it to exert a force opposite to the vibration direction through the steel cable at the connection. This reduces the torque at the connection, thus suppressing the vibration amplitude and minimizing its impact. This effect is more pronounced and the damping effect is greater when the vibration amplitude changes direction.
[0008] Furthermore, the curvature of the lower surface of the disc-shaped body is greater than that of the upper surface.
[0009] Beneficial effects: Because the steel cables are distributed obliquely, the force in the direction of gravity will also suppress the vibration amplitude through the component force generated by the steel cables. Furthermore, the lower surface curvature of the disc is greater than that of the upper surface. Under the influence of wind, airflow with different speeds will be formed on the upper and lower surfaces of the disc, with the airflow velocity on the lower surface being higher than that on the upper surface. The faster the airflow velocity, the lower its pressure, which will exert downward pressure on the disc, thereby enhancing its vibration suppression capability.
[0010] Furthermore, the bottom of the disc-shaped body has a cavity, and a striking bell is rotatably connected to the top of the cavity. The four side walls of the cavity are all made of different timbre materials.
[0011] Beneficial effect: When the disc-shaped body is vibrated by the boom, the vibrating bell will also hit the side wall of the cavity during the swing. The four side walls of the cavity are made of different timbre materials, allowing pedestrians or drivers on the bridge to judge the direction of the sway by the timbre of the bell.
[0012] Furthermore, the height of the disc-shaped body is 80% to 95% of the height of the boom.
[0013] Beneficial effects: The disc shape, located near the connection point, makes the steel cable shorter, resulting in better tensile strength and reduced breakage.
[0014] Furthermore, spare retaining rings are provided at the connection points between the disc-shaped body and the top of the suspender rod and the arch or bridge tower.
[0015] Beneficial effects: Steel cables will age and deform after prolonged tension, thus requiring periodic replacement. Spare retaining rings and collars can be used interchangeably to facilitate the replacement process. Specifically, after securing the disc-shaped body with the spare retaining ring, the original steel cable is removed to complete the replacement. For the next replacement, the collar is used to tighten the cable before removing it from the spare retaining ring.
[0016] Furthermore, a hydrophobic layer is coated on the surface of the disc-shaped body.
[0017] Beneficial effects: The hydrophobic layer makes it less likely for rainwater to accumulate on the surface of the disc, thereby reducing the impact of rainwater corrosion on its service life.
[0018] Furthermore, the disc-shaped structure and steel cables are located inside or on the crossbeams of the bridge tower.
[0019] Beneficial effect: The disc-shaped structure is relatively heavy, and if it falls, it will severely damage the bridge deck. Therefore, the disc-shaped structure is placed inside the crossbeam of the bridge tower or on the crossbeam of the bridge tower, so that if it falls, it will be caught by the crossbeam of the bridge tower before it can accumulate gravitational potential energy, thereby reducing the damage caused by sudden accidents.
[0020] Furthermore, a rigid net is installed on the bridge tower, and the rigid net is located below the disc-shaped body.
[0021] Beneficial effects: The rigid net can cushion the impact force when the disc-shaped object falls, thereby reducing the damage caused by the impact. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of an embodiment of the present invention.
[0023] Figure 2 This is a schematic diagram of the disc-shaped structure.
[0024] Figure 3 for Figure 1 A schematic diagram of part A.
[0025] Figure 4 This is a schematic diagram of the arch assembly. Detailed Implementation
[0026] The following detailed description illustrates the specific implementation method:
[0027] The reference numerals in the accompanying drawings include: disc-shaped body 1, collar 2, steel cable 3, cavity 4, striking bell 5, spare fixing ring 6, hydrophobic layer 7, rigid net 8.
[0028] Example 1
[0029] The basic implementation examples are as follows: Figure 1 and attached Figure 4 As shown:
[0030] A wind-resistant and vibration-damping device for bridge suspenders includes a disc-shaped body 1 made of high-density material. The disc-shaped body 1 has four collars 2 on each side, and steel cables 3 are attached to the collars 2. The steel cables 3 are fixed to the top of the suspender and the connection between it and the arch or bridge tower. The upper and lower surfaces of the disc-shaped body 1 are both streamlined and smooth.
[0031] The specific implementation process is as follows: The disc-shaped body 1 is suspended at the connection between the top of the suspender and the arch or bridge tower. The disc-shaped body 1 has a high density, so it has a smaller wind-receiving surface and a smaller displacement under the action of the wind field. The upper and lower surfaces of the disc-shaped body 1 are both streamlined and smooth, which further enhances the wind guiding ability, so that the wind is guided away by the streamlined structure, reducing the displacement under the action of the wind field, and making the displacement speed of the disc-shaped body 1 different from that of the connection between the top of the suspender and the arch or bridge tower.
[0032] When vibration occurs, because the steel cable 3 connects the top of the gantry to the arch or bridge tower, the cable 3 will drive the disc-shaped body 1, causing it to sway along with the connection between the top of the gantry and the arch or bridge tower. However, due to its better wind resistance and larger mass, the speed and acceleration of the disc-shaped body 1 are significantly lower than those at the connection between the top of the gantry and the arch or bridge tower. Therefore, under the inertia of the disc-shaped body 1, it will resist displacement, causing it to exert a force opposite to the direction of vibration through the steel cable 3. This reduces the torque at the connection between the top of the gantry and the arch or bridge tower, thereby suppressing the vibration amplitude and reducing its impact. This effect is more pronounced and the damping effect is greater when the vibration amplitude changes direction.
[0033] Example 2
[0034] The difference from the above embodiment is that the curvature of the lower surface of the disc-shaped body 1 is greater than that of the upper surface.
[0035] The specific implementation process is as follows: Because the steel cables 3 are obliquely distributed, the force in the direction of gravity will also suppress the vibration amplitude through the component force generated by the steel cables 3. Since the curvature of the lower surface of the disc-shaped body 1 is greater than that of the upper surface, under the influence of the wind field, airflows with different speeds will be formed on the upper and lower surfaces of the disc-shaped body 1, with the airflow velocity on the lower surface being higher than that on the upper surface. The faster the airflow velocity, the lower its pressure, which will cause the disc-shaped body 1 to experience downward pressure, thereby enhancing its vibration suppression capability.
[0036] Example 3
[0037] The difference from the above embodiment is that: the bottom of the disc-shaped body 1 is provided with a cavity 4, the top of the cavity 4 is rotatably connected to a striking bell 5, and the four side walls of the cavity 4 are all made of different timbre materials.
[0038] The specific implementation process is as follows: When the disc-shaped body 1 is driven by the vibration of the suspender, the vibrating bell will also hit the side wall of the cavity 4 during the swing. The four side walls of the cavity 4 are all made of different timbre materials, so that pedestrians or drivers on the bridge can judge the direction of the sway by the timbre of the bell.
[0039] Example 4
[0040] The difference from the above embodiment is that the height of the disc-shaped body 1 is 80% to 95% of the height of the boom.
[0041] The specific implementation process is as follows: The disc-shaped body 1 is placed near the connection point, making the steel cable 3 shorter, which improves its tensile strength and makes it less prone to breakage.
[0042] Example 5
[0043] The difference from the above embodiment is that: both the disc-shaped body 1 and the top of the suspender rod are provided with spare fixing rings 6 at the connection with the arch or bridge tower.
[0044] The specific implementation process is as follows: Steel cable 3 will age and deform after being under tension for a long time, so it needs to be replaced regularly. The spare fixing ring 6 and the collar 2 can be used alternately to facilitate the replacement process. Specifically, after using the spare fixing ring 6 to tie the disc-shaped body 1, the original steel cable 3 is removed to complete the replacement. The next replacement is to use the collar 2 to tighten it and then remove the steel cable 3 from the spare fixing ring 6.
[0045] Example 6
[0046] The difference from the above embodiment is that the surface of the disc-shaped body 1 is coated with a hydrophobic layer 7.
[0047] The specific implementation process is as follows: The hydrophobic layer 7 makes it less likely for rainwater to accumulate on the surface of the disc 1, thereby reducing the impact of rainwater corrosion on the service life.
[0048] Example 7
[0049] The difference from the above embodiment is that the disc-shaped body 1 and the steel cable 3 are located inside the crossbeam of the bridge tower or on the crossbeam of the bridge tower.
[0050] The specific implementation process is as follows: The disc-shaped body 1 is relatively heavy, and if it falls, it will severely damage the bridge deck. Therefore, the disc-shaped body 1 is placed inside the crossbeam of the bridge tower or on the crossbeam of the bridge tower, so that if it falls, it will be caught by the crossbeam of the bridge tower before it accumulates gravitational potential energy, thereby reducing the harm of sudden accidents.
[0051] Example 8
[0052] The difference from the above embodiment is that a rigid net 8 is provided on the bridge tower, and the rigid net 8 is located below the disc-shaped body 1.
[0053] The specific implementation process is as follows: The rigid net 8 can buffer the impact force when the disc-shaped body 1 falls, so as to reduce the damage caused by the impact.
[0054] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A wind-resistant and vibration-damping device for bridge suspenders, characterized in that: It includes a disc-shaped body made of high-density material. The disc-shaped body has collars on all four sides, and steel cables are attached to the collars. The steel cables are fixed to the top of the suspender and the connection between the suspender and the bridge tower. The upper and lower surfaces of the disc-shaped body are streamlined and smooth. The curvature of the lower surface of the disc-shaped object is greater than that of the upper surface; The bottom of the disc-shaped body has a cavity, and a striking bell is rotatably connected to the top of the cavity. The four side walls of the cavity are made of different timbre materials.
2. The wind-resistant and vibration-damping device for bridge suspenders according to claim 1, characterized in that: The height of the disc-shaped body is 80% to 95% of the height of the boom.
3. The wind-resistant and vibration-damping device for bridge suspenders according to claim 2, characterized in that: Spare retaining rings are provided at the connection points between the disc-shaped body and the top of the suspender rod and the bridge tower.
4. The wind-resistant and vibration-damping device for bridge suspenders according to claim 3, characterized in that: The surface of the disc-shaped body is coated with a hydrophobic layer.
5. The wind-resistant and vibration-damping device for bridge suspenders according to claim 4, characterized in that: The disc-shaped structure and steel cables are located inside or on the crossbeams of the bridge tower.
6. The wind-resistant and vibration-damping device for bridge suspenders according to claim 5, characterized in that: The bridge tower is equipped with a rigid net, which is located below the disc-shaped structure.