A protective device and method for viscoelastic vibration damping frame of bridge slings

Abstract

The present invention discloses a protective device and method suitable for a viscoelastic vibration damping frame for bridge cables. The protective device includes a protective part and a testing part. The protective part includes a waterproof protective shell, a sheath, and a retractable canopy; a waterproof coating is laid inside the shell, and the shell extends an eave outward and tightly engages with the edge of the sheath; the shell and the retractable canopy are connected by a protrusion and a groove, and the retractable canopy can achieve adaptive deformation according to the relative position change of the shells on both sides. The testing part includes an acceleration sensor, which can collect the vibration response of the cable in the longitudinal and transverse directions of the bridge at the vibration damping frame. Through the coordinated work of the waterproof protective shell, the sheath, the retractable canopy, and the waterproof coating, the device can form a closed cavity inside the shell, isolate the influence of factors such as rainwater and solar radiation on the viscoelastic vibration damping frame, and greatly extend its service life; at the same time, the acceleration sensor can monitor the vibration response of multiple positions on the cable, thereby more accurately depicting the motion state of the cable and mastering its vibration law.

Description

Technical Field

[0001] The present invention relates to a protective device and method suitable for a viscoelastic vibration damping frame of bridge cables, and is particularly suitable for the protection and vibration monitoring of viscoelastic vibration damping frames on multiple cables of long-span suspension bridges and mid- / underpass arch bridges, belonging to the field of bridge engineering management and monitoring. Background Art

[0002] With the rapid development of modern transportation, the main spans of bridges are constantly increasing. The Zhangjinggao Yangtze River Bridge, currently under construction, will have a main span of 2,300 meters, making it the world's longest suspension bridge upon completion. Its longest cable reaches 265 meters, far exceeding the cable length of existing suspension bridges. The bridge also has 372 cables exceeding 100 meters in length. As typical wind-sensitive structures, long cables, characterized by low frequency, light weight, low damping, and a high slenderness ratio, are increasingly susceptible to vibration problems under wind loads. The large cable lengths can easily cause cracking in the cable sleeves, leading to cable corrosion and shortening their service life. Excessive cable amplitude can also cause public panic. Therefore, the research and development of vibration suppression methods and devices for long cables has become a key area of ​​focus in the dynamic analysis of long-span bridges.

[0003] Given that slings are often arranged in a pinned or straddled configuration, with each suspension point typically consisting of two or four slings, the addition of vibration dampers between multiple slings has become the most common structural measure for reducing sling vibration on long-span bridges. These dampers increase the in-plane stiffness and vibration frequency of the slings, increasing their wind speed. They also convert large vibrations in long slings into smaller vibrations within the cable segments, effectively preventing the problem of multiple slings colliding. Based on the stiffness of their connectors, vibration dampers can be categorized as rigid or viscoelastic. Rigid slings typically use rigid steel plates for their connectors, while viscoelastic slings typically consist of elastic cables and high-damping materials. As sling lengths continue to increase, the vibration damping effect of rigid slings decreases. Consequently, numerous projects, such as the Nansha Second Bridge, have adopted viscoelastic slings for their superior vibration damping performance.

[0004] Because viscoelastic vibration damping mount connectors typically utilize elastic cables and high-damping materials, and rubber pads are inserted between the vibration damping mount clips and the slings to increase friction, the long-term service life of long-span bridges inevitably leads to aging or corrosion of rubber and viscoelastic connectors, which is exposed to solar radiation and rainwater, seriously affecting the performance of the viscoelastic vibration damping mount. Furthermore, the increased length of the slings makes it more difficult to monitor their service status. Therefore, a new method is urgently needed to effectively protect viscoelastic vibration damping mounts with long slings and monitor their vibration response. Summary of the Invention

[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide a technical solution that can protect the viscoelastic vibration damping frame of the sling to ensure its safe service, and further realize real-time monitoring of the vibration condition of the vibration damping frame position.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A protective device for a viscoelastic vibration damping frame of a bridge sling, the viscoelastic vibration damping frame comprising a viscoelastic connector (3) and two vibration damping frame clips (2) respectively mounted at both ends of the viscoelastic connector, each vibration damping frame clip (2) being capable of clamping and mounting a sling (1); the protective device comprising a protective portion and a testing portion, wherein:

[0008] The protective part includes a waterproof protective shell and a retractable canopy (6);

[0009] The waterproof protective shell includes two, corresponding to the first and second waterproof protective shells; the first waterproof protective shell, the telescopic canopy (6) and the second waterproof protective shell are sequentially sleeved on the periphery of the bridge cable viscoelastic vibration damping frame along the length extension direction of the bridge cable viscoelastic vibration damping frame and are connected to each other into one body through a detachable connection method; the telescopic canopy (6) is arranged at a middle position corresponding to the bridge cable viscoelastic vibration damping frame and can achieve axial telescopic expansion, while the first and second waterproof protective shells are symmetrically arranged on both sides of the telescopic canopy (6) and respectively opposite to the positions of the two cables;

[0010] Each waterproof protective shell is a split structure, including two shell splits (4), and the outer edge of the split surface of each shell split (4) is inlaid with a permanent magnet (13); the outer ends of the two shell splits (4) extend outward to form eaves, and a sheath (5) is provided outside the eaves of the two shell splits (4) at the joint position of the two, and the eaves and the edge of the sheath (5) are tightly engaged; the two shell splits (4) are provided with semicircular grooves at positions corresponding to the sling (1); the two shell splits (4) are respectively arranged on the upper and lower sides of the viscoelastic vibration damping frame of the bridge sling and are adsorbed and bonded into one through the permanent magnets (13) inlaid on the outer edges of the two, and at the same time, the semicircular grooves at the corresponding positions of the two shell splits (4) can be spliced ​​to form a through hole matching the outer diameter of the sling (1);

[0011] The test section is equipped with a set of acceleration sensors for each suspension cable (1), and each set of acceleration sensors includes a longitudinal bridge acceleration sensor (10) and a transverse bridge acceleration sensor (11); the longitudinal bridge acceleration sensor (10) and the transverse bridge acceleration sensor (11) are both installed in a waterproof protective shell and are located between the corresponding waterproof protective shell and the suspension cable (1); the longitudinal bridge acceleration sensor (10) is used to detect the vibration of the suspension cable (1) in the longitudinal bridge direction at the vibration reduction frame position, and the transverse bridge acceleration sensor (11) is used to detect the vibration of the suspension cable (1) in the transverse bridge direction at the vibration reduction frame position.

[0012] Preferably, the length of the housing body (4) along the length extension direction of the sling (1) should be longer than the length of the viscoelastic vibration damping frame clip (2).

[0013] Preferably, a waterproof coating (9) is laid inside the housing body (4).

[0014] Preferably, the eaves of the housing split (4) are formed by bending outwards, and an embedding groove is provided on the inner side of the sheath (5), and the shape of the embedding groove of the sheath (5) matches the curved shape of the eaves of the housing split (4).

[0015] Preferably, a protrusion (7) is provided on the side edge of the housing split (4), and a groove (8) is provided on the telescopic canopy (6) at a position corresponding to the protrusion (7); the housing split (4) and the telescopic canopy (6) are connected through the mating connection of the protrusion (7) and the groove (8).

[0016] Preferably, there are two groups of acceleration sensors, and each group of acceleration sensors includes one longitudinal bridge acceleration sensor (10) and one transverse bridge acceleration sensor (11).

[0017] Preferably, it further comprises a solar panel (12); there are four solar panels (12) in total, which are respectively embedded in the outer surfaces of the four shell parts (4); the solar panels (12) convert external solar radiation energy into electrical energy to supply power to the internal longitudinal bridge acceleration sensor (10) and the transverse bridge acceleration sensor (11).

[0018] Another technical purpose of the present invention is to provide a protection method for a viscoelastic vibration damping frame for bridge slings, which is based on the above-mentioned protection device for the viscoelastic vibration damping frame for bridge slings. The double-strand sling viscoelastic vibration damping frame is wrapped around the inner side of the shell body (4), the sheath (5) and the telescopic canopy (6) by using a protective part, and specifically includes the following steps:

[0019] Step 1: Pass the vibration damping frame viscoelastic connector (3) through the telescopic canopy (6) and connect it to the vibration damping frame clip (2);

[0020] Step 2: Fix the vibration damping frame clip (2) to the outside of the sling (1) through high-strength bolts (14);

[0021] Step 3: Inlay and fix the solar cell panel (12) on the outside of the housing body (4);

[0022] Step 4: Fix the longitudinal bridge acceleration sensor (10) and the transverse bridge acceleration sensor (11) inside the housing body (4), check the energy supply of the solar cell panel (12), and set the acceleration sensor data acquisition parameters;

[0023] Step 5: Install the housing body (4) on the outside of the viscoelastic vibration damping frame according to the position of the semicircular groove corresponding to the sling (1), ensuring that there is one longitudinal bridge acceleration sensor (10) and one transverse bridge acceleration sensor (11) on the waterproof protective shell on the same sling (1) side;

[0024] Step 6: Connect the two shell parts (4) of the waterproof protective shell on the same side through the permanent magnets (13) embedded in the edges, and install the sheath (5);

[0025] Step 7: Insert the protrusions (7) on the sides of the two side shell parts (4) into the grooves (8) on the side edges of the telescopic tent (6), and fill the interfaces with waterproof coating;

[0026] Step 8: Check whether the protective part has water leakage and whether the test part collects vibration signals normally; if there is any abnormality, check and repair according to steps 5 to 7.

[0027] Preferably, for a length of l Double slings, arranged from bottom to top n protective devices, with heights of z 1. z 2. ... z n The left sling vibration response at the corresponding position can be obtained by the left accelerometer at the measuring point height. a l ( x 1, y 1) a l ( x 2, y 2) ... a l ( x n , y n ); The vibration response of the right sling at the corresponding position can be obtained by the right acceleration sensor at the measuring point height a r ( x 1,y 1) a r ( x 2, y 2) ... a r ( x n , y n ),in, x, y Represent the transverse and longitudinal directions of the bridge respectively; the vibration response function of the sling can be established f l ( x , y , z ), f r ( x , y , z ),satisfy:

[0028] ;

[0029] .

[0030] Preferably, spectrum and time-spectrum analysis are performed on the data collected by the acceleration sensor to obtain the energy distribution characteristics of the vibration signals of the left and right slings in the frequency domain; the data collected by the acceleration sensor are filtered and a displacement distribution model of the sling is established through an integration method to identify the vibration form of the sling and analyze the cause, so as to facilitate the adoption of emergency and maintenance measures; the vibration forms of the sling include buffeting, vortex vibration and parametric vibration.

[0031] The beneficial effects of the present invention are:

[0032] (1) By arranging permanent magnets between the shells on the same side, wrapping the outer side of the shell with a protective sheath, and setting a protrusion and groove connection between the shell and the telescopic tent, a closed cavity is formed inside the shell, which prevents moisture from the external environment from penetrating into the shell, isolates the influence of factors such as rain erosion and solar radiation on the viscoelastic vibration damping frame, and greatly improves the service life of the viscoelastic vibration damping frame.

[0033] (2) By laying a waterproof coating made of high-performance water-absorbing materials such as water-absorbing resin on the inner surface of the shell, a small amount of moisture that may penetrate into the cavity is absorbed, further ensuring a dry working environment for the viscoelastic vibration damping frame.

[0034] (3) By setting a telescopic canopy between the two side shells, the protective device can achieve coordinated deformation of the protective device and the viscoelastic vibration damping frame while ensuring a dry environment in the internal cavity.

[0035] (4) By installing acceleration sensors and solar panels to power them, real-time monitoring of the vibration response of the suspension cables at the vibration damping frame in the longitudinal and transverse directions of the bridge is achieved. By installing several protective devices at different positions on the long suspension cables, the vibration response at multiple positions on the suspension cables can be monitored, thereby more accurately reconstructing the motion state of the suspension cables and understanding their vibration patterns.

[0036] (5) The protective device is made into separate parts, which makes the installation and replacement of the protective device very convenient, and also provides convenience for the maintenance of the internal viscoelastic vibration damping frame.

[0037] This design not only protects the viscoelastic vibration damping frame of long cables on large-span bridges, but also realizes real-time monitoring of the vibration response of the vibration damping frame position. It can not only significantly extend the service life of the viscoelastic vibration damping frame, but also has extremely important significance for depicting the motion state of long cables under complex loads, studying the vibration laws of long cables, and guiding the design and construction practice of bridge structures. Therefore, it has broad engineering application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is an exploded view of the overall structure of the sling viscoelastic vibration damping frame protective device and the sling and vibration damping frame according to the present invention;

[0039] Figure 2 This is a schematic diagram of the overall structure of the sling viscoelastic vibration damping frame protection device after installation;

[0040] Figure 3 for Figure 1 Schematic diagram of the viscoelastic vibration damping mount;

[0041] Figure 4a for Figure 1 Schematic diagram of the middle waterproof protective shell and the longitudinal bridge acceleration sensor; Figure 4b for Figure 1 Schematic diagram of the middle waterproof protective shell and the transverse bridge acceleration sensor;

[0042] Figure 5a for Figure 1 Top view of the medium waterproof protective case; Figure 5b for Figure 1 Main view of the medium waterproof protective case; Figure 5c for Figure 1 Side view of the medium waterproof protective case;

[0043] Figure 6a for Figure 4a Schematic diagram of the mid-longitudinal bridge acceleration sensor; Figure 6b for Figure 4b Schematic diagram of the mid-transverse bridge acceleration sensor;

[0044] Figure 7a for Figure 1 Schematic diagram of the middle telescopic tent (undeformed state); Figure 7b for Figure 1 Schematic diagram of the telescopic tent (compressed state); Figure 7c for Figure 1 Schematic diagram of the telescopic tent (in stretched state);

[0045] Figure 8 The figure is a schematic diagram of the arrangement of the sling viscoelastic vibration damping frame protection device described in the present invention in the double-strand slings of a long-span bridge.

[0046] List of reference numerals:

[0047] 1. Sling; 2. Vibration mount clip; 3. Viscoelastic connector; 4. Casing segment; 5. Jacket; 6. Retractable canopy; 7. Protrusion; 8. Groove; 9. Waterproof coating; 10. Longitudinal bridge acceleration sensor; 11. Transverse bridge acceleration sensor; 12. Solar panel; 13. Permanent magnet; 14. High-strength bolts; 15. Rubber padding; 16. Filling layer. DETAILED DESCRIPTION

[0048] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0049] like Figure 1 As shown in Figures 7 to 7, the protective device suitable for the viscoelastic vibration damping frame of the bridge cable described in the present invention includes a protective part and a testing part, the protective part includes a waterproof protective shell, a sheath 5, and a retractable canopy 6; the waterproof protective shell includes a shell split 4 and a permanent magnet 13, and a waterproof coating 9 is laid inside the shell split 4; the shell split 4 extends outward with an eaves, and a sheath 5 is provided outside the eaves of the two shell splits 4 on the same side, and the eaves are tightly engaged with the edges of the sheath 5; the shell split 4 and the retractable canopy 6 are connected by a protrusion 7 and a groove 8; the testing part includes a longitudinal bridge acceleration sensor 10, a transverse bridge acceleration sensor 11, and a solar panel 12.

[0050] like Figure 1 、 3As shown, the viscoelastic vibration damping frame includes clips 2, viscoelastic connectors 3, high-strength bolts 14, rubber pads 15, and a filling layer 16. The clips 2 consist of four pieces, each with an arc-shaped center and straight ends with bolt holes. High-strength bolts 14 pass through the bolt holes at each end of the upper and lower clips 2, wrapping the upper and lower plates around the outside of the sling. Rubber pads 15 are placed outside the high-strength bolts 14 between the clips 2. The clips 2 on both sides are connected by viscoelastic connectors 3, which are typically made of elastic cables and high-damping materials or other deformable structures.

[0051] like Figure 1 、 2 As shown in Figures 4 and 5, in a protective device for a viscoelastic vibration damping frame for bridge cables according to the present invention, the waterproof protective shell comprises four components, arranged on both sides, inside and outside, outside the cable 1 and the viscoelastic vibration damping frame clip 2. The waterproof protective shell comprises a housing body 4 and a permanent magnet 13. The housing body 4 is longer than the viscoelastic vibration damping frame clip 2 along the cable 1. The housing body 4 has a semicircular groove defined by the diameter of the cable 1. The permanent magnet 13 is embedded in the outer edge of the housing body 4. The two housing bodies 4 on the same side are tightly fitted together through the adsorption of the permanent magnet 13, forming a circular hole that matches the diameter of the cable 1, preventing moisture from intruding into the housing through the cable. The eaves of the two housing bodies 4 on the same side are curved outward, their curvature matching the grooves of the protective shell 5. This ensures a tight fit between the eaves and the edge of the protective shell 5, further preventing infiltration of rainwater and other inflows. At the same time, a waterproof coating 9 is laid on the inner surface of the shell body 4. The waterproof coating 9 is made of high-performance water-absorbing materials such as water-absorbing resin, and can absorb a small amount of moisture that penetrates into the interior of the shell.

[0052] like Figure 1 、 2 As shown in Figures 4, 5, and 7, a retractable canopy 6 is disposed between the housing segments 4 on either side. A protrusion 7 is provided on the side edges of the housing segments 4, and grooves 8 are provided on the side edges of the retractable canopy 6. The protrusions 7 and grooves 8 correspond to each other and are intermittently disposed. The retractable canopy 6 is made of a waterproof material such as leather and has the ability to longitudinally expand and contract, adaptively stretching or compressing according to the relative positions of the housing segments 4 on either side.

[0053] like Figure 1 、 2As shown in Figures 4, 5, and 6, the test section includes a longitudinal bridge acceleration sensor 10, a transverse bridge acceleration sensor 11, and a solar panel 12. There are two groups of acceleration sensors, each group including one longitudinal bridge acceleration sensor 10 and one transverse bridge acceleration sensor 11. The sensors in the same group are fixed to the inner sides of the two shell parts 4 on the same side by bolts or other means, located between the shell parts 4 and the sling 1, to ensure the synchronous movement of the acceleration sensors, the shell, and the sling at the vibration damping frame, thereby collecting the vibration responses of the vibration damping frame and the sling in the longitudinal and transverse bridge directions. There are four solar panels 12, respectively embedded in the outer surfaces of the four shell parts 4. The solar panels 12 convert external solar radiation energy into electrical energy to power the internal longitudinal bridge acceleration sensors 10 and transverse bridge acceleration sensors 11.

[0054] like Figure 8 As shown in the figure, this structure should be installed between adjacent cables under the same suspension point of a long-span suspension bridge / arch bridge. Several structures of this structure can be arranged according to the position of the vibration damping frame, so that the vibration response of multiple measuring points of the cable can be obtained in a more detailed manner. l Take the double-strand sling as an example, arrange it from bottom to top n protective devices, with heights of z 1. z 2. ... z n , the vibration response of the left sling at the measuring point height can be obtained respectively a l ( x 1, y 1) a l ( x 2, y 2) ... a l ( x n , y n ) and the vibration response of the right sling a r ( x 1, y 1) a r ( x 2, y 2) ... a r ( x n , y n ),in, x, y Represent the transverse and longitudinal directions of the bridge respectively. Further, by selecting appropriate interpolation functions, the vibration response function of the sling can be established. f l( x , y , z ), f r ( x , y , z ),satisfy:

[0055] ;

[0056] .

[0057] Based on the above-mentioned viscoelastic vibration damping frame protection device, the present invention can realize the protection of the viscoelastic vibration damping frame of the long suspension cable of the large-span bridge, which specifically includes the following steps:

[0058] Step 1: Pass the vibration damping frame viscoelastic connector 3 through the telescopic canopy 6 and connect it to the vibration damping frame clip 2;

[0059] Step 2: Fix the vibration damping frame clip 2 to the outside of the sling 1 through high-strength bolts 14;

[0060] Step 3: Mount and fix the solar panel 12 on the outside of the vibration damping frame protective shell body 4;

[0061] Step 4: Fix the longitudinal bridge acceleration sensor 10 and the transverse bridge acceleration sensor 11 inside the housing body 4, check the energy supply of the solar panel 12, and set the acceleration sensor data acquisition parameters;

[0062] Step 5: Install the housing parts 4 on the outside of the vibration damping frame according to the position of the groove corresponding to the sling 1, ensuring that there is one longitudinal bridge acceleration sensor 10 and one transverse bridge acceleration sensor 11 on each of the two housing parts 4 on the same sling 1 side;

[0063] Step 6: Connect the two shell parts 4 on the same side through the permanent magnets 13 embedded in the edges, and install the sheath 5;

[0064] Step 7: Insert the protrusions 7 on the sides of the shell body 4 into the grooves 8 on the side edges of the telescopic tent 6, and fill the interface with waterproof coating;

[0065] Step 8: Check whether the protective part has water leakage and whether the test part collects vibration signals normally; if there is any abnormality, check and repair according to steps 5 to 7.

[0066] In addition, during use, the present invention performs spectrum and time-spectrum analysis on the data collected by the acceleration sensor to obtain the energy distribution characteristics of the vibration signals of the left and right slings in the frequency domain; the data collected by the acceleration sensor is filtered and a displacement distribution model of the sling is established through an integration method to identify the vibration form of the sling and analyze the cause, so as to facilitate the adoption of emergency and maintenance measures; the vibration forms of the sling include buffeting, vortex vibration and parametric vibration.

[0067] The following aspects should also be noted in this implementation:

[0068] 1. To ensure the sealing effect between the shell and the sling, the diameter of the semicircular groove of the shell should be selected according to the diameter of the sling.

[0069] Second, considering that the protective device should achieve coordinated deformation with the viscoelastic vibration damping frame, the allowable deformation capacity of the telescopic tent should be slightly greater than the deformation capacity of the viscoelastic connector of the vibration damping frame.

[0070] As a preferred example, the retractable canopy in this example uses a continuous side design to ensure waterproofing. Therefore, the retractable canopy must be installed before the vibration damping frame. To enhance the convenience of the protective device, while ensuring the sealing performance of the interface, the retractable canopy can also adopt a discontinuous side design.

[0071] The above are all preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can still be made without departing from the principles of the present invention. These improvements should also be considered as the scope of protection of the present invention.

Claims

1. A protective device for a viscoelastic vibration damping frame for bridge slings, the viscoelastic vibration damping frame comprising a viscoelastic connector (3) and two vibration damping frame clips (2) respectively mounted at both ends of the viscoelastic connector, each vibration damping frame clip (2) being capable of clamping and mounting a sling (1); characterized in that: The protection device comprises a protection part and a testing part, wherein: The protective part includes a waterproof protective shell and a retractable canopy (6); The waterproof protective shell includes two, corresponding to the first and second waterproof protective shells; the first waterproof protective shell, the telescopic canopy (6) and the second waterproof protective shell are sequentially sleeved on the periphery of the bridge cable viscoelastic vibration damping frame along the length extension direction of the bridge cable viscoelastic vibration damping frame and are connected to each other into one body through a detachable connection method; the telescopic canopy (6) is arranged at a middle position corresponding to the bridge cable viscoelastic vibration damping frame and can achieve axial telescopic expansion, while the first and second waterproof protective shells are symmetrically arranged on both sides of the telescopic canopy (6) and respectively opposite to the positions of the two cables; Each waterproof protective shell is a split structure, including two shell splits (4), and the outer edge of the split surface of each shell split (4) is inlaid with a permanent magnet (13); the outer ends of the two shell splits (4) extend outward to form eaves, and a sheath (5) is provided outside the eaves of the two shell splits (4) at the joint position of the two, and the eaves and the edge of the sheath (5) are tightly engaged; the two shell splits (4) are provided with semicircular grooves at positions corresponding to the sling (1); the two shell splits (4) are respectively arranged on the upper and lower sides of the viscoelastic vibration damping frame of the bridge sling and are adsorbed and bonded into one through the permanent magnets (13) inlaid on the outer edges of the two, and at the same time, the semicircular grooves at the corresponding positions of the two shell splits (4) can be spliced ​​to form a through hole matching the outer diameter of the sling (1); The test section is equipped with a set of acceleration sensors for each suspension cable (1), and each set of acceleration sensors includes a longitudinal bridge acceleration sensor (10) and a transverse bridge acceleration sensor (11); the longitudinal bridge acceleration sensor (10) and the transverse bridge acceleration sensor (11) are both installed in a waterproof protective shell and are located between the corresponding waterproof protective shell and the suspension cable (1); the longitudinal bridge acceleration sensor (10) is used to detect the vibration of the suspension cable (1) in the longitudinal bridge direction at the vibration reduction frame position, and the transverse bridge acceleration sensor (11) is used to detect the vibration of the suspension cable (1) in the transverse bridge direction at the vibration reduction frame position.

2. A protective device for a viscoelastic vibration damping frame of a bridge sling according to claim 1, characterized in that: The length of the housing split (4) along the length extension direction of the sling (1) should be longer than the length of the vibration damping frame clip (2).

3. The protective device for a viscoelastic vibration damping frame of a bridge sling according to claim 1, characterized in that: A waterproof coating (9) is laid inside the housing body (4).

4. The protective device for a viscoelastic vibration damping frame of a bridge sling according to claim 1, characterized in that: The eaves of the housing split (4) are formed by bending outwards, and an embedding groove is provided on the inner side of the sheath (5), and the shape of the embedding groove of the sheath (5) matches the curved shape of the eaves of the housing split (4).

5. The protective device for a viscoelastic vibration damping frame of a bridge sling according to claim 1, characterized in that: The side edge of the housing split (4) is provided with a protrusion (7), and the telescopic tent (6) is provided with a groove (8) at a position corresponding to the protrusion (7); the housing split (4) and the telescopic tent (6) are connected through the matching connection of the protrusion (7) and the groove (8).

6. The protective device for a viscoelastic vibration damping frame of a bridge sling according to claim 1, characterized in that: There are two groups of acceleration sensors, each group of which includes a longitudinal bridge acceleration sensor (10) and a transverse bridge acceleration sensor (11).

7. A protective device for a viscoelastic vibration damping frame for bridge suspenders according to claim 1 or 6, characterized in that: It also includes solar panels (12); there are four solar panels (12) in total, which are respectively embedded in the outer surfaces of the four shell parts (4); the solar panels (12) convert external solar radiation energy into electrical energy to supply power to the internal longitudinal bridge acceleration sensor (10) and the transverse bridge acceleration sensor (11).

8. A protection method for a viscoelastic vibration damping frame for bridge cables, implemented based on the protection device for a viscoelastic vibration damping frame for bridge cables according to claim 1, characterized in that: The double-strand sling viscoelastic vibration damping frame is wrapped around the inner side of the shell body (4), the sheath (5) and the telescopic canopy (6) using a protective part, specifically comprising the following steps: Step 1: Pass the viscoelastic connector (3) through the telescopic tent (6) and connect it to the vibration damping frame clip (2); Step 2: Fix the vibration damping frame clip (2) to the outside of the sling (1) through high-strength bolts (14); Step 3: Inlay and fix the solar cell panel (12) on the outside of the housing body (4); Step 4: Fix the longitudinal bridge acceleration sensor (10) and the transverse bridge acceleration sensor (11) inside the housing body (4), check the energy supply of the solar cell panel (12), and set the acceleration sensor data acquisition parameters; Step 5: Install the housing body (4) on the outside of the viscoelastic vibration damping frame according to the position of the semicircular groove corresponding to the sling (1), ensuring that there is a longitudinal bridge acceleration sensor (10) and a transverse bridge acceleration sensor (11) on the waterproof protective shell on the same sling (1) side; Step 6: Connect the two shell parts (4) of the waterproof protective shell on the same side through the permanent magnets (13) embedded in the edges, and install the sheath (5); Step 7: Insert the protrusions (7) on the sides of the two side shell parts (4) into the grooves (8) on the side edges of the telescopic tent (6), and fill the interfaces with waterproof coating; Step 8: Check whether the protective part has water leakage and whether the test part collects vibration signals normally; if there is any abnormality, check and repair according to steps 5 to 7.

9. The protection method for a viscoelastic vibration damping frame for bridge suspenders according to claim 8, characterized in that: For length l Double slings, arranged from bottom to top n protective devices, with heights of z 1. z 2. ... z n The left sling vibration response at the corresponding position can be obtained by the left accelerometer at the measuring point height. a l ( x 1, y 1) a l ( x 2, y 2) ... a l ( x n , y n ); The vibration response of the right sling at the corresponding position can be obtained by the right acceleration sensor at the measuring point height a r ( x 1, y 1) a r ( x 2, y 2) ... a r ( x n , y n ),in, x, y Represent the transverse and longitudinal directions of the bridge respectively; the vibration response function of the sling can be established f l ( x , y , z ), f r ( x , y , z ),satisfy: ； 。 10. The protection method for a viscoelastic vibration damping frame for bridge suspenders according to claim 9, characterized in that: By performing spectrum and time-spectrum analysis on the data collected by the acceleration sensor, the energy distribution characteristics of the vibration signals of the left and right cables in the frequency domain are obtained. By filtering the data collected by the acceleration sensor and establishing a displacement distribution model of the cable through the integration method, the vibration form of the cable is identified and the cause is analyzed, facilitating the implementation of emergency and maintenance measures. The vibration forms of the cable include buffeting, vortex vibration and parametric vibration.

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