Stay cable tension compensation and vibration suppression device for large-span cable-stayed bridge

Abstract

The utility model discloses a stay cable tension compensation and vibration suppression device for a large-span cable-stayed bridge, which comprises a tension compensation mechanism arranged at the end part of a stay cable, the tension compensation mechanism is fixed on an anchoring seat, a first vibration suppression mechanism and a second vibration suppression mechanism are arranged on the stay cable at an interval along the length direction of the stay cable, and the first vibration suppression mechanism and the second vibration suppression mechanism are fixed on the anchoring seat. The first vibration suppression mechanism and the second vibration suppression mechanism are connected through the longitudinal adjusting mechanism, and the first vibration suppression mechanism is fixed to the anchoring base. According to the utility model, the adaptive capacity of a bridge to environmental changes can be effectively improved, the stress uniformity of the stay cable is ensured, the deformation of the bridge is effectively controlled, and the service life of the bridge is prolonged, so that the operation efficiency and the safety of the cable-stayed bridge are ensured. The device is suitable for the technical field of long-term safe operation and maintenance of the large-span cable-stayed bridge in bridge engineering.

Description

Technical Field

[0001] This utility model belongs to the field of bridge engineering and structural vibration control technology. Specifically, it relates to a device for tension compensation and vibration suppression of cable stays in long-span cable-stayed bridges. Background Technology

[0002] In the field of modern bridge engineering, long-span cable-stayed bridges, as an important bridge structural form, are widely used in the construction of bridges spanning major rivers and important transportation hubs. Cable-stayed bridges connect the bridge deck and towers via stay cables, allowing the bridge to span large distances without intermediate supports. The stay cables are the key load-bearing components of a cable-stayed bridge, and their stress state directly affects the overall performance and safety of the bridge. Stay cables need to withstand enormous tensile forces to maintain the stability and load-bearing capacity of the bridge deck. At the same time, stay cables must also possess sufficient flexibility to adapt to the deformation of the bridge under different loads and environmental conditions. However, due to the structural complexity and high flexibility of long-span cable-stayed bridges, they are extremely sensitive to external environmental factors (such as temperature changes and wind effects), which can easily cause significant changes in the tensile stress and vibration of the stay cables.

[0003] The impact of temperature changes on cable stays is primarily manifested in the thermal expansion and contraction effect. When the temperature rises, the cable stays expand, increasing their length; when the temperature falls, they contract, decreasing their length. This length variation causes fluctuations in the internal stress of the cable stays, potentially leading to overstretching or relaxation, thus affecting the structural stability of the bridge. Drastic temperature changes can also subject the cable stays to repeated stress cycles, increasing the risk of fatigue damage, gradually reducing their load-bearing capacity, and even potentially causing breakage. Furthermore, temperature changes affect the mechanical properties of the cable stay materials; for example, high temperatures may reduce the strength and stiffness of metallic materials, while low temperatures may increase their brittleness. Changes in humidity and other environmental factors (such as salt spray and pollutants) accompanying temperature changes can also lead to corrosion and aging of the cable stays, further affecting their service life and safety. Under wind conditions, cable stays are prone to flutter. This wind-induced vibration not only affects the stability of the cable stays but also causes fatigue damage, shortening their service life. The dynamic response caused by wind-induced vibration is transmitted to the entire bridge structure, potentially leading to uneven deformation of the bridge deck and structural vibration, affecting driving comfort and the long-term durability of the bridge. Summary of the Invention

[0004] This invention provides a cable tension compensation and vibration suppression device for long-span cable-stayed bridges, which improves the bridge's adaptability to environmental changes, ensures the uniformity of cable stress, effectively controls bridge deformation, extends the bridge's service life, and thus guarantees the operational efficiency and safety of the cable-stayed bridge.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A tension compensation and vibration suppression device for stay cables of long-span cable-stayed bridges includes a tension compensation mechanism installed at the end of the stay cable, the tension compensation mechanism being fixed on an anchorage, and a first vibration suppression mechanism and a second vibration suppression mechanism being installed at intervals along the length of the stay cable. The first vibration suppression mechanism and the second vibration suppression mechanism are connected by a longitudinal adjustment mechanism, and the first vibration suppression mechanism is fixed on the anchorage.

[0007] Furthermore, the tensioning compensation mechanism includes multiple elastic tensioning components installed between the disc-shaped fixed seat and the disc-shaped connecting seat. These elastic tensioning components are evenly arranged along the circumference of the stay cable, and the disc-shaped fixed seat and the anchor seat are detachably connected. The middle part of the disc-shaped connecting seat is connected to the end of the stay cable through a cable transfer mechanism.

[0008] Furthermore, the elastic tensioning assembly includes a first fixed seat and a second fixed seat arranged opposite to each other, with a plurality of shape memory alloy springs disposed between the first fixed seat and the second fixed seat. A plug rod is constructed on the first fixed seat, and a plug tube is constructed on the second fixed seat. One end of the plug rod is movably inserted into the plug tube. An electric heating wire is disposed outside the plug tube. The electric heating wire and each shape memory alloy spring are connected to a conductive wire, and the first fixed seat and the second fixed seat are detachably connected to the disc-shaped connecting seat and the disc-shaped fixed seat, respectively.

[0009] Furthermore, the disc-shaped fixing seat has multiple lower mounting ports, and each second fixing seat can be detachably mounted at the corresponding lower mounting port. Multiple fixing ears are evenly constructed on the disc-shaped fixing seat along its circumference, and each fixing ear is detachably connected to the anchor seat. The disc-shaped connecting seat has multiple upper mounting ports, and each first fixing seat can be detachably mounted at the corresponding upper mounting port.

[0010] Furthermore, a cylindrical telescopic cover is provided over the disc-shaped fixing seat and the disc-shaped connecting seat. A first sleeve edge and a second sleeve edge are respectively constructed at both ends of the cylindrical telescopic cover. A first fixing edge and a second fixing edge are respectively constructed at the outer edges of the disc-shaped connecting seat and the disc-shaped fixing seat. The first sleeve edge and the second sleeve edge are respectively fitted and fixed outside the first fixing edge and the second fixing edge.

[0011] Furthermore, the cable transfer mechanism includes a cylindrical guide body and a frustum-shaped fixing body. Multiple wire holes are evenly formed in the guide body along its circumference, and the two ends of each wire hole extend out of the guide body and the fixing body respectively. The inclined cable includes multiple circumferentially arranged cable bodies. One end of each cable body passes through the wire hole and exits the fixing body. A locking nut is threaded onto the cable body, and the locking nut is tightened on the end face of the fixing body away from the guide body.

[0012] Furthermore, a tightening sleeve is fitted and fixed on the stay cable, the tightening sleeve is close to the cable transfer mechanism, and the multiple cable bodies constituting the stay cable are tightly bound in the tightening sleeve.

[0013] Furthermore, the first vibration suppression mechanism includes a first elastic tension net fitted over the stay cable and movably connected to the stay cable, and a plurality of first inclined tension members are uniformly connected around the first elastic tension net. Each first inclined tension member has a first mounting seat hinged to one end away from the first elastic tension net, and the first mounting seat is fixed to the anchor seat.

[0014] Furthermore, the second vibration suppression mechanism includes a second elastic tension net fitted around the stay cable and movably connected to the stay cable. The structure of the second elastic tension net is the same as that of the first elastic tension net. Multiple second inclined tension members are uniformly connected around the second elastic tension net, and a second mounting base is hinged to the end of each second inclined tension member away from the second elastic tension net.

[0015] Furthermore, the longitudinal adjustment mechanism includes multiple longitudinal lead screws, each of which is threadedly connected to a corresponding first mounting seat, and one end of the longitudinal lead screw is rotatably connected to a corresponding second mounting seat, with an operating handwheel installed at the other end of the longitudinal lead screw.

[0016] The technological advancements achieved by this invention compared to existing technologies, due to the aforementioned structure, lie in the following: When external environmental changes occur, the stay cables may stretch, contract, or vibrate. This invention compensates for these stretching or contraction through a tension compensation mechanism, and suppresses the vibration of the stay cables through a first and a second vibration suppression mechanism. This multi-stage suppression of stay cable vibration ensures the stay cables adapt to the corresponding environment and maintains uniform stress distribution. Furthermore, this invention adjusts the distance between the first and second vibration suppression mechanisms via a longitudinal adjustment mechanism, thereby adjusting the suppression points of the first and second mechanisms and adjusting their vibration suppression capabilities. This ensures effective suppression of stay cable vibration under different seasons and external environments. In summary, this invention effectively improves the bridge's adaptability to environmental changes, ensures uniform stress distribution in the stay cables, effectively controls bridge deformation, extends the bridge's service life, and thus guarantees the operational efficiency and safety of cable-stayed bridges. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0020] Figure 2 A schematic diagram of the structure of the stay cable connected to the tensioning compensation mechanism via the cable transfer mechanism in this embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the connection between the stay cable and the cable transfer mechanism in an embodiment of this utility model;

[0022] Figure 4 This is an axial structural cross-sectional view of the connection between the stay cable and the cable transfer mechanism in an embodiment of this utility model;

[0023] Figure 5 This is a partial structural cross-sectional view of the cable transfer mechanism according to an embodiment of the present utility model;

[0024] Figure 6 This is a schematic diagram of the tensioning compensation mechanism according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the cylindrical telescopic cover in the tensioning compensation mechanism of this utility model embodiment;

[0026] Figure 8 This is an exploded view of the tension compensation mechanism of this utility model after removing the cylindrical telescopic cover;

[0027] Figure 9 This is an exploded view of the elastic tensioning component in the tensioning compensation mechanism according to an embodiment of this utility model;

[0028] Figure 10 This is a schematic diagram showing the connection between the stay cable, the first vibration suppression mechanism, the second vibration suppression mechanism, and the longitudinal adjustment mechanism in an embodiment of this utility model.

[0029] Figure 11 This is a schematic diagram showing the connection between the longitudinal adjustment mechanism and the local first vibration suppression mechanism and the local second vibration suppression mechanism in an embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram of the structure of the first elastic tension net in the first vibration suppression mechanism of this utility model embodiment.

[0031] Components labeled: 100-Stay cable, 101-Cable body, 200-Tension compensation mechanism, 201-Disc-shaped connecting seat, 202-First fixed edge, 203-Upper mounting port, 204-Disc-shaped fixing seat, 205-Second fixed edge, 206-Lower mounting port, 207-Fixing lug, 208-Elastic tensioning assembly, 2081-First fixing seat, 2082-Second fixing seat, 2083-Conductive wire, 2084-Memory alloy spring, 2085-Plug-in connector, 2086-Plug-in rod, 2087-Electric heating wire, 209-Cylindrical telescopic cover, 210-First sleeve edge, 211-Second sleeve edge, 300-Cable adapter Mechanism, 301-Inlet body, 302-Fixing body, 303-Wire hole, 304-Connecting column, 305-Connecting flange, 306-Locking nut, 400-Tightening sleeve, 500-First vibration suppression mechanism, 501-First elastic tension net, 5011-Inner disc seat, 5012-Modible sleeve, 5013-Disc elastic net, 5014-Ring spring, 502-First inclined pull member, 503-First mounting seat, 600-Second vibration suppression mechanism, 601-Second elastic tension net, 602-Second inclined pull member, 603-Second mounting seat, 700-Longitudinal adjustment mechanism, 701-Longitudinal lead screw, 702-Operating handwheel. Detailed Implementation

[0032] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0033] This utility model discloses a device for tension compensation and vibration suppression of cable-stayed bridges with long spans, such as... Figures 1 to 12As shown, the device includes a tension compensation mechanism 200, a first vibration suppression mechanism 500, a second vibration suppression mechanism 600, and a longitudinal adjustment mechanism 700. The tension compensation mechanism 200 is installed at the end of the stay cable 100 and fixed to the anchorage. The first vibration suppression mechanism 500 and the second vibration suppression mechanism 600 are installed at intervals along the length of the stay cable 100 and are connected by the longitudinal adjustment mechanism 700. The first vibration suppression mechanism 500 is also fixed to the anchorage. The working principle and advantages of this utility model are as follows: When the external environment changes, the stay cable 100 may stretch, contract, or vibrate. This utility model uses a tension compensation mechanism 200 to compensate for the stretching or contraction of the stay cable 100, and uses a first vibration suppression mechanism 500 and a second vibration suppression mechanism 600 to suppress the vibration of the stay cable 100, achieving multi-level suppression of the vibration of the stay cable 100. This ensures that the stay cable 100 adapts to the corresponding environment and that the stress on the stay cable 100 is uniform. Furthermore, this utility model uses a longitudinal adjustment mechanism 700 to adjust the distance between the first vibration suppression mechanism 500 and the second vibration suppression mechanism 600, thereby adjusting the suppression point of the first vibration suppression mechanism 500 and the second vibration suppression mechanism 600 on the stay cable 100, and thus adjusting their vibration suppression capabilities on the stay cable 100. This ensures that the vibration of the stay cable 100 can be effectively suppressed in different seasons and under different external environments. In summary, this utility model can effectively improve the bridge's adaptability to environmental changes, ensure the uniformity of stress on the cable-stayed bridge, effectively control bridge deformation, extend the bridge's service life, and thus guarantee the operational efficiency and safety of the cable-stayed bridge.

[0034] As a preferred embodiment of this utility model, such as Figure 2 , Figures 6 to 9As shown, the tensioning compensation mechanism 200 includes a disc-shaped fixing seat 204, a disc-shaped connecting seat 201, a cylindrical telescopic cover 209, and multiple elastic tensioning components 208. These elastic tensioning components 208 are installed between the disc-shaped fixing seat 204 and the disc-shaped connecting seat 201, and are evenly arranged along the circumference of the stay cable 100. The disc-shaped fixing seat 204 is detachably connected to the anchor seat, and the middle part of the disc-shaped connecting seat 201 is connected to the end of the stay cable 100 via a cable transfer mechanism 300. A cylindrical telescopic cover 209 is fitted over the disc-shaped fixing seat 204 and the disc-shaped connecting seat 201. A first set of edges 210 and a second set of edges 211 are respectively constructed at both ends of the cylindrical telescopic cover 209. A first fixing edge 202 and a second fixing edge 205 are respectively constructed at the outer edges of the disc-shaped connecting seat 201 and the disc-shaped fixing seat 204. The first set of edges 210 and the second set of edges 211 are respectively fitted and fixed to the outer edges of the first fixing edge 202 and the second fixing edge 205. In this embodiment, multiple elastic tensioning components 208 are used to elastically tension the stay cable 100, improving the stability of the tension and ensuring sufficient compensation for the expansion and contraction of the stay cable 100, thus improving the compensation performance of the stay cable 100. The specific structure of the elastic tensioning assembly 208 in this embodiment is as follows: The elastic tensioning assembly 208 includes a first fixed seat 2081 and a second fixed seat 2082 disposed opposite to each other. A plurality of shape memory alloy springs 2084 are disposed between the first fixed seat 2081 and the second fixed seat 2082. A plug-in rod 2086 is constructed on the first fixed seat 2081, and a plug-in tube 2085 is constructed on the second fixed seat 2082. One end of the plug-in rod 2086 is movably inserted into the plug-in tube 2085. An electric heating wire 2087 is disposed outside the plug-in tube 2085. The electric heating wire 2087 and each shape memory alloy spring 2084 are connected to a conductive wire 2083. Furthermore, the first fixed seat 2081 and the second fixed seat 2082 are detachably connected to the disc-shaped connecting seat 201 and the disc-shaped fixed seat 204, respectively. The shape memory alloy spring 2084 has a diameter of 15mm, a free length of 500mm, and a phase transformation temperature range of -30~80℃. This shape memory alloy spring 2084 is a Ni-Ti-Nb ternary alloy spring. A fiber optic sensor is aligned with the stay cable 100 to monitor its temperature. When the fiber optic sensor detects a temperature change ΔT ≥ 5℃ in the stay cable 100, the temperature control circuit applies an adjustable heating current of 0~5A to the shape memory alloy spring 2084 using pulse width modulation (PWM) technology, triggering the austenite-martensite phase transformation of the alloy. This achieves dynamic compensation of the length of the stay cable 100, with a compensation speed of 2mm / ℃ and a maximum compensation range of ±150mm, covering ambient temperature changes from -30~80℃. Simultaneously, the heat dissipation of the electric heating wire 2087 ensures synchronized temperature changes for all the shape memory alloy springs 2084.In this embodiment, the conductive wire 2083 is connected to the intelligent control system. The intelligent control system has a built-in fuzzy PID algorithm, a temperature signal sampling frequency of 1Hz, a vibration signal sampling frequency of 100Hz, and control commands are sent in real time via the CAN bus at a rate of 1Mbps. When the fiber optic sensor detects ΔT≥5℃, the intelligent control system prioritizes the activation of the temperature compensation mode and outputs heating current to the tension compensation mechanism 200 via PWM.

[0035] As a preferred embodiment of this utility model, such as Figure 8 , Figure 9 As shown, the disc-shaped fixing base 204 has multiple lower mounting ports 206, and each second fixing base 2082 is detachably mounted at the corresponding lower mounting port 206. Multiple fixing ears 207 are evenly arranged along the circumference of the disc-shaped fixing base 204, and each fixing ear 207 is detachably connected to the anchoring base. The disc-shaped connecting base 201 has multiple upper mounting ports 203, and each first fixing base 2081 is detachably mounted at the corresponding upper mounting port 203.

[0036] As a preferred embodiment of this utility model, such as Figures 2 to 5 As shown, the cable adapter mechanism 300 includes a cylindrical guide body 301 and a frustum-shaped fixing body 302. Multiple wire holes 303 are evenly distributed circumferentially within the guide body 301, with each wire hole 303 extending from both ends of the guide body 301 and the fixing body 302, respectively. A connecting post 304 is constructed at the end of the fixing body 302 away from the guide body 301, and a connecting flange 305 is constructed at the end of the connecting post 304 away from the fixing body 302. The connecting flange 305 is detachably connected to the elastic tensioning assembly 208. The inclined cable 100 of this embodiment includes multiple circumferentially arranged cable bodies 102. One end of each cable body 102 passes through the wire hole 303 and extends out of the fixing body 302. A locking nut 306 is threaded onto the cable body 102, and the locking nut 306 is tightened onto the end face of the fixing body 302 away from the guide body 301. In this embodiment, by connecting each cable body 102 to the cable adapter mechanism 300, the stay cable 100 and the elastic tensioning component 208 are connected and fixed. Furthermore, to prevent loosening at the ends of the multiple cable bodies 102 constituting the stay cable 100, a tightening sleeve 400 is fitted and fixed onto the stay cable 100. This tightening sleeve 400 is located near the cable adapter mechanism 300, and the multiple cable bodies 102 constituting the stay cable 100 are tightly bound within the tightening sleeve 400.

[0037] As a preferred embodiment of this utility model, such as Figures 10 to 12As shown, the first vibration suppression mechanism 500 includes a first elastic tension net 501 and a plurality of first inclined tension members 502. The first elastic tension net 501 is fitted around and movably connected to the inclined tension cable 100. The plurality of first inclined tension members 502 are uniformly connected to the first elastic tension net 501 along its circumference. Each first inclined tension member 502 has a first mounting base 503 hinged to one end away from the first elastic tension net 501, and the first mounting base 503 is fixed to an anchoring seat. The specific structure of the first elastic tension net 501 in this embodiment is as follows: the first elastic tension net 501 includes an inner disc base 5011, a disc-shaped elastic net 5013, and an annular spring 5014. A movable sleeve 5012 is constructed at the center of the inner disc base 5011, and the movable sleeve 5012 is fitted onto the outside of the inclined cable 100. The disc-shaped elastic net 5013 is coaxially connected to the outside of the inner disc base 5011. The annular spring 5014 is installed at the outer edge of the disc-shaped elastic net 5013, and one end of each first inclined member 502 is connected to the annular spring 5014. The second vibration suppression mechanism 600 in this embodiment includes a second elastic tension net 601 and a plurality of second inclined members 602. The second elastic tension net 601 has the same structure as the first elastic tension net 501. The second elastic tension net 601 is fitted around the stay cable 100 and movably connected to it. Multiple second inclined tension members 602 are evenly connected to the second elastic tension net 601 circumferentially. Each second inclined tension member 602 has a second mounting base 603 hinged to its end away from the second elastic tension net 601. Furthermore, in this embodiment, the first and second inclined tension members 502 can be hydraulic cylinders. During the vibration of the stay cable 100, the first and second elastic tension nets 501 and 601 undergo elastic deformation and absorb the energy generated by the vibration, thereby suppressing vibration. Furthermore, by controlling the movement of the first inclined member 502 and the second inclined member 602, the degree of elastic tension of the first elastic mesh 501 and the second elastic mesh 601 can be changed, thereby altering the elastic pretension of the first elastic mesh 501 and the second elastic mesh 601, and thus changing their performance in suppressing the vibration of the stay cable 100. The longitudinal adjustment mechanism 700 of this embodiment includes multiple longitudinal lead screws 701, each longitudinal lead screw 701 being threadedly connected to a corresponding first mounting base 503, and one end of each longitudinal lead screw 701 being rotatably connected to a corresponding second mounting base 603. An operating handwheel 702 is installed at the other end of each longitudinal lead screw 701. By rotating the operating handwheel 702, the longitudinal lead screw 701 drives the second mounting base 603 to move toward or away from the first mounting base 503, thereby adjusting the distance between the first vibration suppression mechanism 500 and the second vibration suppression mechanism 600, and adjusting their vibration suppression capabilities on the stay cable 100.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A device for tension compensation and vibration suppression of stay cables in long-span cable-stayed bridges, characterized in that: The cable includes a tension compensation mechanism installed at the end of the cable, which is fixed to the anchorage. A first vibration suppression mechanism and a second vibration suppression mechanism are installed at intervals along the length of the cable. The first vibration suppression mechanism and the second vibration suppression mechanism are connected by a longitudinal adjustment mechanism, and the first vibration suppression mechanism is fixed to the anchorage.

2. The device for tension compensation and vibration suppression of cable-stayed bridges according to claim 1, characterized in that: The tensioning compensation mechanism includes multiple elastic tensioning components installed between the disc-shaped fixed seat and the disc-shaped connecting seat. These elastic tensioning components are evenly arranged along the circumference of the stay cable, and the disc-shaped fixed seat and the anchor seat are detachably connected. The middle part of the disc-shaped connecting seat is connected to the end of the stay cable through a cable transfer mechanism.

3. The device for tension compensation and vibration suppression of cable-stayed bridges according to claim 2, characterized in that: The elastic tensioning assembly includes a first fixed seat and a second fixed seat arranged opposite to each other. A plurality of shape memory alloy springs are arranged between the first fixed seat and the second fixed seat. A plug rod is constructed on the first fixed seat, and a plug tube is constructed on the second fixed seat. One end of the plug rod is movably inserted into the plug tube. An electric heating wire is arranged outside the plug tube. The electric heating wire and each shape memory alloy spring are connected to a conductive wire. The first fixed seat and the second fixed seat are detachably connected to the disc-shaped connecting seat and the disc-shaped fixed seat, respectively.

4. The device for tension compensation and vibration suppression of cable-stayed bridges according to claim 3, characterized in that: The disc-shaped fixing seat has multiple lower mounting ports, and each second fixing seat can be detachably mounted at the corresponding lower mounting port. Multiple fixing ears are evenly constructed on the disc-shaped fixing seat along its circumference, and each fixing ear is detachably connected to the anchor seat. The disc-shaped connecting seat has multiple upper mounting ports, and each first fixing seat can be detachably mounted at the corresponding upper mounting port.

5. The device for tension compensation and vibration suppression of cable-stayed bridges according to claim 2, characterized in that: A cylindrical telescopic cover is provided over the disc-shaped fixing seat and the disc-shaped connecting seat. A first sleeve edge and a second sleeve edge are respectively constructed at both ends of the cylindrical telescopic cover. A first fixing edge and a second fixing edge are respectively constructed at the outer edges of the disc-shaped connecting seat and the disc-shaped fixing seat. The first sleeve edge and the second sleeve edge are respectively fitted and fixed outside the first fixing edge and the second fixing edge.

6. The device for tension compensation and vibration suppression of cable-stayed bridges according to claim 2, characterized in that: The cable transfer mechanism includes a cylindrical guide body and a frustum-shaped fixing body. Multiple wire holes are evenly provided in the guide body along its circumference, and the two ends of each wire hole extend out of the guide body and the fixing body respectively. The inclined cable includes multiple circumferentially arranged cable bodies. One end of each cable body passes through the wire hole and exits the fixing body. A locking nut is threaded onto the cable body, and the locking nut is tightened on the end face of the fixing body away from the guide body.

7. The device for tension compensation and vibration suppression of cable-stayed bridges according to claim 6, characterized in that: A tightening sleeve is fitted and fixed on the stay cable. The tightening sleeve is close to the cable transfer mechanism, and the multiple cable bodies constituting the stay cable are tightly bound inside the tightening sleeve.

8. The device for tension compensation and vibration suppression of cable-stayed bridges according to claim 1, characterized in that: The first vibration suppression mechanism includes a first elastic tension net fitted around the stay cable and movably connected to the stay cable. A plurality of first inclined tension members are uniformly connected around the first elastic tension net. Each first inclined tension member has a first mounting seat hinged to its end away from the first elastic tension net. The first mounting seat is fixed to the anchor seat.

9. A device for tension compensation and vibration suppression of cable-stayed bridges according to claim 8, characterized in that: The second vibration suppression mechanism includes a second elastic tension net fitted around the stay cable and movably connected to the stay cable. The structure of the second elastic tension net is the same as that of the first elastic tension net. Multiple second inclined tension members are uniformly connected around the second elastic tension net. A second mounting base is hinged to the end of each second inclined tension member away from the second elastic tension net.

10. A device for tension compensation and vibration suppression of stay cables in a long-span cable-stayed bridge according to claim 9, characterized in that: The longitudinal adjustment mechanism includes multiple longitudinal lead screws, each of which is threadedly connected to a corresponding first mounting base, and one end of the longitudinal lead screw is rotatably connected to a corresponding second mounting base, with an operating handwheel installed at the other end of the longitudinal lead screw.

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