Cable-stayed bridge damping structure

Abstract

The application discloses a cable-stayed bridge damping structure and belongs to the technical field of bridge engineering, which comprises a stay cable, a fixed sleeve, a buffer and a drainage groove. The fixed sleeve comprises an outer shell and an inner shell. The inner shell is arranged on the outer side of the stay cable, and the outer shell is arranged on the outer side of the inner shell. A plurality of first ventilation openings are uniformly distributed on the outer shell, and a plurality of second ventilation openings are uniformly distributed on the inner shell. The first ventilation openings and the second ventilation openings are arranged alternately. The drainage groove is arranged on the inner shell and corresponds to the first ventilation openings. One end of the buffer is connected with the stay cable, and the other end of the buffer is connected with the inner shell. The application can effectively reduce wind and rain excitation and improve the damping effect of the stay cable under the action of wind and rain.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, and specifically relates to a vibration reduction structure for cable-stayed bridges. Background Technology

[0002] A cable-stayed bridge, also known as a skeletal-stayed bridge, is a type of bridge where the main girder is directly connected to the bridge towers by numerous cables. It is a structural system composed of compression-bearing towers, tension-bearing cables, and bending-bearing beams. A cable-stayed bridge mainly consists of towers, main girder, and cables, with the cables being crucial load-bearing components. Due to their relatively low mass, stiffness, and damping, cable stays are prone to vibration, especially under the combined effects of wind and rain, which increases the probability of significant wind-induced vibration. Such vibration can easily lead to bridge safety accidents, thus requiring vibration reduction measures for the cables. Commonly used vibration reduction measures in engineering include pneumatic measures, installation of dampers, and installation of auxiliary cables, but these measures are not ideal for controlling cable vibration. Therefore, how to provide a vibration reduction structure that can effectively improve the vibration reduction effect of cable stays under wind and rain is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] In view of this, the present invention provides a vibration reduction structure for cable-stayed bridges, which can effectively reduce wind and rain-induced vibration and improve the vibration reduction effect of cable-stayed bridges under wind and rain.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A vibration reduction structure for cable-stayed bridges, comprising:

[0006] cable stays;

[0007] A fixing sleeve includes an outer shell and an inner shell. The inner shell is disposed on the outside of the cable-stayed bridge, and the outer shell is disposed on the outside of the inner shell. The outer shell has a plurality of first ventilation openings evenly distributed on it, and the inner shell has a plurality of second ventilation openings evenly distributed on it. The first ventilation openings and the second ventilation openings are staggered. The inner shell is provided with a drainage groove, which corresponds to the first ventilation openings.

[0008] A buffer element, one end of which is connected to the stay cable, and the other end of which is connected to the inner shell.

[0009] Preferably, the vibration reduction structure of the cable-stayed bridge also includes a support base and a damper. The support base is set on the ground by pre-embedded steel bars. One end of the damper is rotatably connected to the support base, and the other end of the damper is rotatably connected to the locking clamp on the cable.

[0010] Preferably, there are two support seats and two dampers, with the two support seats respectively located on both sides of the stay cable and the two dampers respectively located on the corresponding support seats.

[0011] Preferably, the included angle between the support and the damper is 120°.

[0012] Preferably, the vibration reduction structure of the cable-stayed bridge further includes a sealing cover, the top end of which is sealed to the cable stays, the bottom end of which is connected to the top end of the inner shell, and the top end of the inner shell is sealed.

[0013] Preferably, multiple buffer components are provided, and the multiple buffer components are evenly distributed along the circumference of the cable.

[0014] Preferably, multiple drainage channels are provided, and the multiple drainage channels are arranged in an intersecting manner, with the intersection of the drainage channels corresponding to the first ventilation opening.

[0015] Preferably, both the first vent and the second vent are equipped with rain covers.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention, by providing a first vent in the outer shell and a second vent in the inner shell, allows strong winds to pass through both vents, thereby reducing the direct impact of wind and rain. The staggered arrangement of the first and second vents prevents rainwater passing through the first vent from easily entering the second vent. A drainage channel matching the first vent allows rainwater to flow along the channel to the ground. Furthermore, the inclusion of a buffer further reduces the vibration of the stay cables. Additional aspects and advantages of this invention will be set forth in part in the description which follows, and will become apparent from the description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is an overall schematic diagram of the cable-stayed bridge vibration reduction structure of the present invention;

[0020] Figure 2 This is a top view of the fixing sleeve of the present invention;

[0021] Figure 3 This is a front view of the cable-stayed bridge vibration reduction structure of the present invention.

[0022] In the figure:

[0023] 1. Stay cable; 2. Fixing sleeve; 21. Outer shell; 22. Inner shell; 23. First vent; 24. Second vent; 25. Drainage channel; 3. Buffer; 4. Support base; 5. Damper; 6. Embedded steel bar; 7. Locking clamp; 8. Sealing cover. Detailed Implementation

[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] See appendix Figure 1-3 This invention discloses a vibration reduction structure for cable-stayed bridges, comprising:

[0026] Cable 1;

[0027] The fixed sleeve 2 includes an outer shell 21 and an inner shell 22. The inner shell 22 is located outside the cable 1, and the outer shell 21 is located outside the inner shell 22. The outer shell 21 has a plurality of first ventilation openings 23 evenly distributed on it, and the inner shell 22 has a plurality of second ventilation openings 24 evenly distributed on it. The first ventilation openings 23 and the second ventilation openings 24 are staggered. The inner shell 22 is provided with a drainage groove 25, which corresponds to the first ventilation openings 23. By providing the first ventilation openings 23 on the outer shell 21 and the second ventilation openings 24 on the inner shell 22, strong winds can pass through the first ventilation openings 23 and the second ventilation openings 24, thereby reducing the direct wind and rain effect. By staggering the first ventilation openings 23 and the second ventilation openings 24, rainwater passing through the first ventilation openings 23 cannot easily enter the second ventilation openings 24. The drainage groove 25, which matches the first ventilation openings 23, allows rainwater to flow along the drainage groove 25 to the ground, thereby reducing wind and rain vibration.

[0028] The buffer 3 is connected at one end to the cable 1 and at the other end to the inner shell 22. By setting the buffer 3, the frequency and amplitude of the vibration of the cable 1 are further limited, and the vibration reduction effect is improved. The buffer 3 is preferably a spring or a damper 5.

[0029] In this embodiment, preferably, the vibration reduction structure of the cable-stayed bridge also includes a support base 4 and a damper 5. The support base 4 is set on the ground by pre-embedded steel bars 6. One end of the damper 5 is rotatably connected to the support base 4, and the other end of the damper 5 is rotatably connected to the locking clamp 7 on the cable 1. The cable 1 is further restricted by the damper 5 and the support base 4 to improve the vibration reduction effect. The support base 4 is fixed by the pre-embedded steel bars 6 to improve the stability of the support base 4.

[0030] In this embodiment, preferably, two support seats 4 and two dampers 5 are provided. The two support seats 4 are respectively provided on both sides of the cable 1, and the two dampers 5 are respectively provided on the corresponding support seats 4. The dampers 5 provided on both sides enable the cable 1 to vibrate, especially when it shakes left and right, so that the two dampers 5 can play a certain limiting role and improve the stability of the cable 1.

[0031] In this embodiment, preferably, the included angle between the support base 4 and the damper 5 is 120°.

[0032] In this embodiment, preferably, the cable-stayed bridge vibration reduction structure further includes a sealing cover 8. The top end of the sealing cover 8 is sealed to the cable 1, the bottom end of the sealing cover 8 is connected to the top end of the inner shell 22, and the top end of the inner shell 22 is sealed. By setting the sealing cover 8 and sealing the top end of the inner shell 22, rainwater can be prevented from entering the interior of the fixed sleeve 2 through the top end of the fixed sleeve 2. Preferably, the sealing cover 8 is an inverted funnel-shaped structure.

[0033] In this embodiment, preferably, multiple buffer elements 3 are provided, and the multiple buffer elements 3 are evenly distributed around the circumference of the cable 1. Preferably, eight buffer elements 3 are provided, with one buffer element 3 provided every 45°. By providing buffer elements 3 evenly distributed around the circumference, the frequency and amplitude of the vibration of the cable 1 are further limited, thereby improving the vibration reduction effect.

[0034] In this embodiment, preferably, multiple drainage channels 25 are provided, and the multiple drainage channels 25 are arranged in a cross manner, with the intersection point of the drainage channels 25 corresponding to the first ventilation opening 23; the cross arrangement of the drainage channels 25 can further increase the probability of rainwater falling into the drainage channels 25.

[0035] In this embodiment, preferably, both the first vent 23 and the second vent 24 are provided with rain covers; by providing rain covers, the probability of rainwater passing through the first vent 23 and the second vent 24 is further reduced, and the mesh rain covers can also disperse strong winds to a certain extent, reducing the wind force entering between the first vent 23 and the second vent 24.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vibration reduction structure for cable-stayed bridges, characterized in that, include: cable stays; A fixing sleeve includes an outer shell and an inner shell. The inner shell is disposed on the outside of the cable-stayed bridge, and the outer shell is disposed on the outside of the inner shell. The outer shell has a plurality of first ventilation openings evenly distributed on it, and the inner shell has a plurality of second ventilation openings evenly distributed on it. The first ventilation openings and the second ventilation openings are staggered. The inner shell is provided with a drainage groove, which corresponds to the first ventilation openings. A buffer element, one end of which is connected to the stay cable, and the other end of which is connected to the inner shell.

2. The vibration reduction structure for a cable-stayed bridge according to claim 1, characterized in that, It also includes a support base and a damper. The support base is set on the ground by pre-embedded steel bars. One end of the damper is rotatably connected to the support base, and the other end of the damper is rotatably connected to the locking clamp on the cable.

3. The vibration reduction structure for a cable-stayed bridge according to claim 2, characterized in that, There are two of each of the support bases and the dampers. The two support bases are respectively located on both sides of the stay cable, and the two dampers are respectively located on the corresponding support bases.

4. The vibration reduction structure for a cable-stayed bridge according to claim 2, characterized in that, The angle between the support and the damper is 120°.

5. The vibration reduction structure for a cable-stayed bridge according to claim 1, characterized in that, It also includes a sealing cover, the top of which is sealed to the inclined cable, the bottom of which is connected to the top of the inner shell, and the top of the inner shell is sealed.

6. The vibration reduction structure for a cable-stayed bridge according to claim 1, characterized in that, Multiple buffer components are provided, and the multiple buffer components are evenly distributed along the circumference of the cable.

7. The vibration reduction structure for a cable-stayed bridge according to claim 1, characterized in that, The drainage channels are provided in multiple ways, and the drainage channels are arranged in an intersecting manner. The intersection of the drainage channels corresponds to the first ventilation opening.

8. The vibration reduction structure for a cable-stayed bridge according to claim 1, characterized in that, Both the first vent and the second vent are equipped with rain covers.

Images