Cable-stayed bridge cable constant tension control device

Abstract

The utility model discloses a cable-stayed bridge cable constant tension control device, it includes the bridge body, the inside of box is provided with the hydraulic oil tank, the inside fixed mounting of box has the hydraulic pump. Through above -mentioned structure, when part of the rope bears greater impact because of the uneven distribution of vehicle position or wind load, the high -frequency vibration energy of rope because of uneven force is converted into heat energy, effectively dissipates the excess kinetic energy, avoids the rope to appear excessive stretching or violent swing, and the core components such as hydraulic pump, electromagnetic reversing valve, cylinder barrel and piston rod cooperate and operate, and the hydraulic pump will be in the hydraulic oil tank Hydraulic oil is transported to the cylinder barrel in the delivery pipe, electromagnetic reversing valve and flow pipe, and electromagnetic reversing valve adjusts the hydraulic oil flow direction according to the stress change flexibly, and pushes the piston rod telescopic, real -time compensation rope tension, ensure that the rope always keeps constant tension under the complex and changeable load environment, effectively reduce the fatigue damage of rope because of tension fluctuation, prolong the service life of rope.

Description

Technical Field

[0001] This utility model relates to the field of cable constant tension control technology, and in particular to a cable constant tension control device for cable-stayed bridges. Background Technology

[0002] In the field of modern long-span bridge engineering, cable-stayed bridges have become an important bridge type choice due to their superior spanning capacity and elegant structural design. However, the cables, as the core load-bearing components of cable-stayed bridges, are constantly exposed to a complex and ever-changing external environment. Wind-induced vibrations (including vortex-induced vibration, flutter, and buffeting) and dynamic loads generated by vehicles traveling on the bridge deck combine to cause the cable tension to exhibit significant time-varying fluctuation characteristics. In particular, when strong wind loads are unevenly distributed in space, some cables will inevitably bear instantaneous impact loads far exceeding the average level, becoming weak links in the structural system.

[0003] Current cable tension control technology used in cable-stayed bridge engineering exhibits significant limitations when dealing with the complex and rapidly changing dynamic loads described above. Traditional hydraulic control systems, with their inherent slow response and limited adjustment precision, struggle to achieve real-time tracking and effective compensation for high-frequency, large-amplitude fluctuations in cable tension. This control lag and failure result in the system's inability to promptly suppress severe cable vibrations caused by factors such as uneven wind loads. The direct consequence is that the actual stress state of the cables frequently and drastically deviates from the design target value, leading to severely uneven load distribution among the cables. This continuous, non-uniform stress cycle not only significantly accelerates the fatigue damage process of high-strength steel wire materials and substantially shortens the cable's service life, but also fundamentally threatens the overall structural stability and operational safety of the bridge, posing a potentially major safety hazard. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a constant tension control device for cable-stayed bridges. This device compensates for cable tension in real time, ensuring that the cable maintains constant tension under complex and variable load conditions. It effectively reduces cable fatigue damage caused by tension fluctuations, extends the service life of the cable, converts the high-frequency vibration energy generated by uneven force on the cable into heat energy, effectively dissipates excess kinetic energy, and avoids excessive stretching or violent swinging of the cable. This fundamentally solves the problems of cable fatigue, reduced service life, and bridge safety hazards caused by these issues.

[0005] This utility model provides a constant tension control device for cable-stayed bridges, including a bridge body, inside which ropes bearing tension are installed; a box is fixedly installed on both sides of the bridge body; a hydraulic oil tank for storing hydraulic working medium is installed inside the box; a hydraulic pump for providing hydraulic power is fixedly installed inside the box; a first delivery pipe for drawing hydraulic oil from the hydraulic oil tank is fixedly connected to the rear side of the hydraulic pump; a second delivery pipe for outputting pressurized oil is fixedly installed to the front side of the hydraulic pump; an electromagnetic directional valve for controlling the flow direction of the oil is fixedly installed inside the box; two third delivery pipes for connecting to the return oil circuit are fixedly installed to the rear side of the electromagnetic directional valve; two flow pipes for delivering pressurized oil or return oil are fixedly connected to the front side of the electromagnetic directional valve; one end of each flow pipe extends to the outside of the box and is fixedly connected to a cylinder as an actuator; a bidirectionally movable piston rod is movably fitted inside the cylinder, and the movement of the piston rod is used to adjust the tension of the rope connected to it.

[0006] This invention integrates core hydraulic components such as hydraulic tanks, hydraulic pumps, electromagnetic directional valves, cylinders, and piston rods into housings on both sides of the axle body. A closed-loop oil circuit is formed via a first, second, and third delivery pipe and a flow pipe, driving the piston rod to perform precise bidirectional movement within the cylinder, directly acting on the cable. This improves response speed and adjustment accuracy. The introduction of the electromagnetic directional valve significantly outperforms the response delay of traditional pure hydraulic systems. Its ability to quickly switch the direction of the oil circuit, combined with the stable power source provided by the hydraulic pump, allows the piston rod to rapidly extend and retract according to control commands, achieving rapid tracking and precise compensation for high-frequency fluctuations in cable tension, effectively overcoming the slow response defects of existing technologies. Meanwhile, this invention also achieves dynamic tension stabilization. The design, employing a piston rod directly connected to and driving the cable, along with its bidirectional motion, allows the device to actively and dynamically adjust the cable tension based on real-time monitored tension changes. This is achieved by extending (increasing tension) or retracting (decreasing tension) the piston rod, maintaining it stably near a preset target value. This effectively suppresses severe cable vibration and large tension fluctuations caused by uneven wind loads and other factors. Through this rapid and precise tension adjustment, the device significantly reduces load unevenness between cables and greatly smooths the stress cycle experienced by the cables. This directly reduces the fatigue damage rate of high-strength steel wire materials, thereby significantly extending the cable's service life. Based on this, the overall safety of the bridge is enhanced. By effectively controlling cable tension fluctuations and vibrations, the overall stability and safety of the bridge structure under complex dynamic load environments are greatly improved, fundamentally reducing the safety risks caused by cable failure. Moreover, all key hydraulic actuators (oil tank, pump, valve, cylinder) are built into fixed boxes on both sides of the bridge and are efficiently connected by pipelines. The structure is compact, the layout is reasonable, and it is easy to install and maintain, with little impact on the appearance of the bridge.

[0007] According to the cable-stayed bridge constant tension control device of this utility model, one end of the cylinder is fixedly connected to the bridge body, one end of the piston rod is fixedly connected to the rope, and a sealing plate is fixedly connected to one end of the piston rod.

[0008] According to the cable-stayed bridge constant tension control device of this utility model, one end of the first conveying pipe extends into the interior of the hydraulic oil tank, one end of the third conveying pipe extends into the interior of the hydraulic oil tank, and one end of the second conveying pipe is fixedly connected to the electromagnetic reversing valve.

[0009] According to the cable-stayed bridge constant tension control device of this utility model, the hydraulic oil tank is filled with hydraulic oil, and the flow pipes are all connected to the cylinder. The hydraulic oil inside the hydraulic oil tank flows into the cylinder through the flow pipes, and an oil inlet is provided at the top of the hydraulic oil tank.

[0010] According to the cable-stayed bridge constant tension control device of this utility model, the electromagnetic reversing valve has a flow groove inside, a first spring is fixedly installed inside the flow groove, a movable rod is fixedly installed at one end of the first spring, a sealing ring is fixedly installed on the outside of the movable rod, an electromagnetic block is fixedly installed on one side of the electromagnetic reversing valve, and the movable rod is fixedly connected to the electromagnetic block.

[0011] According to the cable-stayed bridge constant tension control device of this utility model, the rear side of the flow channel is interconnected with the second and third conveying pipes, and the front side of the flow channel is connected to the flow pipes.

[0012] According to the cable-stayed bridge constant tension control device of this utility model, one end of the rope is fixedly connected to a telescopic rod, a sleeve is provided on the outside of the telescopic rod, a second spring is fixedly installed inside the sleeve, and a damping sleeve is provided on the outside of the telescopic rod.

[0013] According to the cable-stayed bridge constant tension control device of this utility model, one end of the second spring is fixedly connected to the telescopic rod, the outer surface of the damping sleeve is in close contact with the inner wall of the sleeve, and one end of the sleeve is fixedly connected to the bridge body.

[0014] Beneficial effects:

[0015] 1. The constant tension control device for cable-stayed bridges in this technical solution involves the coordinated operation of core components such as hydraulic pumps, electromagnetic reversing valves, cylinders, and piston rods. When external wind-induced vibrations or vehicle loads cause changes in the cable tension, the hydraulic pump delivers hydraulic oil from the hydraulic tank to the cylinder via a delivery pipe, electromagnetic reversing valve, and flow pipe. The electromagnetic reversing valve flexibly adjusts the hydraulic oil flow direction according to the force changes, pushing the piston rod to extend and retract, compensating for the cable tension in real time. This ensures that the cable maintains constant tension under complex and variable load environments, effectively reducing cable fatigue damage caused by tension fluctuations and extending the cable's service life.

[0016] 2. When a portion of the rope experiences a significant impact due to uneven vehicle position or wind load distribution, the damping assembly consisting of the connected telescopic rod, sleeve, second spring, and damping sleeve responds rapidly. The second spring absorbs energy through elastic deformation, while the damping sleeve utilizes its close contact with the inner wall of the sleeve to convert the high-frequency vibration energy generated by the uneven force on the rope into heat energy, effectively dissipating excess kinetic energy and preventing the rope from being overstretched or swinging violently. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 This is a perspective view of the cable constant tension control device for cable-stayed bridges according to this utility model;

[0019] Figure 2 This is a structural diagram of the hydraulic oil tank of the cable-stayed bridge constant tension control device of this utility model;

[0020] Figure 3 This is a cylinder structure diagram of the cable constant tension control device for cable-stayed bridges of this utility model;

[0021] Figure 4 This is a structural diagram of the electromagnetic reversing valve of the cable constant tension control device for cable-stayed bridges according to this utility model;

[0022] Figure 5 This is a structural diagram of the damping sleeve of the cable constant tension control device for cable-stayed bridges according to this utility model.

[0023] Legend:

[0024] 1—Bridge body; 2—Rope; 3—Box body; 4—Hydraulic oil tank; 5—Hydraulic pump; 6—First delivery pipe; 7—Second delivery pipe; 8—Solenoid directional valve; 9—Third delivery pipe; 10—Flow pipe; 11—Cylinder; 12—Piston rod; 13—Sealing plate; 14—Flow groove; 15—First spring; 16—Moving rod; 17—Sealing ring; 18—Solenoid block; 19—Telescopic rod; 20—Sleeve; 21—Second spring; 22—Damping sleeve. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] Reference Figure 1-5This utility model discloses a cable-stayed bridge constant tension control device, which includes a bridge body 1, which can bear traffic loads and connect the roadbeds at both ends. Ropes 2 are installed inside the bridge body 1 to bear loads, transmit force flow, and maintain structural stability. Boxes 3 are fixedly installed on both sides of the bridge body 1 to protect the internal structure. Hydraulic oil tanks 4 are installed inside the boxes 3 for storing hydraulic oil. A hydraulic pump 5 is fixedly installed inside the boxes 3 to facilitate the removal of hydraulic oil from the hydraulic oil tanks 4. A first delivery pipe 6 is fixedly connected to the rear of the hydraulic pump 5 to allow the hydraulic oil in the hydraulic oil tanks 4 to flow out. A second delivery pipe 6 is fixedly installed at the front of the hydraulic pump 5. Pipe 7, through which hydraulic oil can be delivered to the interior of the solenoid directional valve 8, the solenoid directional valve 8 is fixedly installed inside the housing 3, the solenoid directional valve 8 is used to easily change the flow direction of hydraulic oil, two third delivery pipes 9 are fixedly installed on the rear side of the solenoid directional valve 8, through which hydraulic oil can be delivered to the interior of the hydraulic oil tank 4, two flow pipes 10 are fixedly connected to the front side of the solenoid directional valve 8, through which hydraulic oil can be sent into the interior of the cylinder 11, one end of the flow pipe 10 extends to the outside of the housing 3 and is fixedly connected to the cylinder 11, through which the piston rod 12 can be moved, the piston rod 12 is movably fitted inside the cylinder 11, through which the tension of the rope 2 can be easily adjusted.

[0027] In this utility model, one end of the cylinder 11 is fixedly connected to the bridge body 1, one end of the piston rod 12 is fixedly connected to the rope 2, and one end of the piston rod 12 is fixedly connected to a sealing plate 13. The sealing plate 13 can ensure the internal sealing of the cylinder 11 and ensure the stable operation of the hydraulic system.

[0028] Specifically, one end of the first delivery pipe 6 extends into the interior of the hydraulic oil tank 4, one end of the third delivery pipe 9 extends into the interior of the hydraulic oil tank 4, and one end of the second delivery pipe 7 is fixedly connected to the solenoid directional valve 8. When the second delivery pipe 7 is connected to the solenoid directional valve 8, hydraulic oil can be delivered to the interior of the solenoid directional valve 8.

[0029] In this utility model, the hydraulic oil tank 4 is filled with hydraulic oil, and the flow pipes 10 are all connected to the cylinder 11. The hydraulic oil inside the hydraulic oil tank 4 flows into the cylinder 11 through the flow pipes 10. When the hydraulic oil inside the hydraulic oil tank 4 flows into the cylinder 11, it can compensate the tension of the rope 2 in real time. An oil inlet is provided on the top of the hydraulic oil tank 4, and hydraulic oil can be sent into the hydraulic oil tank 4 through the oil inlet.

[0030] In this invention, the electromagnetic reversing valve 8 has a flow groove 14 inside, which facilitates the flow of hydraulic shaft. A first spring 15 is fixedly installed inside the flow groove 14, and the elastic force of the first spring 15 can better reset the movable rod 16. The movable rod 16 is fixedly installed at one end of the first spring 15, and the movable rod 16 can drive the sealing ring 17 to move. The sealing ring 17 is fixedly installed on the outside of the movable rod 16, and the sealing ring 17 can change the flow direction of hydraulic oil. An electromagnetic block 18 is fixedly installed on one side of the electromagnetic reversing valve 8, and the movable rod 16 is fixedly connected to the electromagnetic block 18. The electromagnetic block 18 can drive the movable rod 16 to move.

[0031] In this utility model, the rear side of the flow channel 14 is connected to the second delivery pipe 7 and the third delivery pipe 9, and the front side of the flow channel 14 is connected to the flow pipe 10. The hydraulic oil can flow better by connecting or interconnecting the flow channel 14 with the second delivery pipe 7, the third delivery pipe 9 and the flow pipe 10.

[0032] In this invention, one end of the rope 2 is fixedly connected to a telescopic rod 19. The telescopic rod 19 can better drive the damping sleeve 22 and the second spring 21 to move. A sleeve 20 is provided on the outside of the telescopic rod 19, which facilitates the operation of the damping sleeve 22. The second spring 21 is fixedly installed inside the sleeve 20, which can help the damping sleeve 22 reduce vibration. The damping sleeve 22 is provided on the outside of the telescopic rod 19, which can better reduce vibration.

[0033] In this utility model, one end of the second spring 21 is fixedly connected to the telescopic rod 19, the outer surface of the damping sleeve 22 is in close contact with the inner wall of the sleeve 20, and one end of the sleeve 20 is fixedly connected to the bridge body 1. When the outer surface of the damping sleeve 22 is in close contact with the inner wall of the sleeve 20, the high-frequency vibration energy can be effectively converted into heat energy dissipation.

[0034] Working principle: Ropes 2 are installed inside the bridge body 1. The core control unit consists of hydraulic oil tanks 4, hydraulic pumps 5, and solenoid directional valves 8 inside the two side boxes 3. The hydraulic pumps 5 draw hydraulic oil from the hydraulic oil tanks 4 through the first delivery pipe 6 and deliver it to the solenoid directional valves 8 through the second delivery pipe 7. The flow groove 14, the first spring 15, the movable rod 16, the sealing ring 17, and the solenoid block 18 inside the solenoid directional valve 8 work together. When the rope 2 is subjected to a change in force, the solenoid block 18 controls the movable rod 16 to move, changing the flow direction of the hydraulic oil. The hydraulic oil enters the cylinder 11 through the third delivery pipe 9 and the flow pipe 10. One end of the cylinder 11 is fixed to the bridge body 1, and the piston rod 1... 2 is connected to rope 2. The hydraulic oil entering the cylinder 11 pushes the piston rod 12 to extend and retract, compensating for the tension of rope 2 in real time. The sealing plate 13 ensures the internal sealing of the cylinder 11 and ensures the stable operation of the hydraulic system. When part of rope 2 is subjected to a large impact due to uneven distribution of vehicle position or wind load, the damping assembly composed of the extension rod 19, sleeve 20, second spring 21 and damping sleeve 22 at one end of rope 2 plays a role. The second spring 21 absorbs energy through elastic deformation, and the damping sleeve 22 is in close contact with the inner wall of sleeve 20, converting high-frequency vibration energy into heat energy for dissipation, avoiding excessive stretching or violent swinging of rope 2, and assisting the hydraulic system in maintaining constant tension of rope 2.

[0035] This invention addresses the significant shortcomings of existing cable tension control technologies for cable-stayed bridges in terms of response speed and adjustment accuracy, making it difficult to effectively handle the severe time-varying fluctuations in cable tension caused by complex dynamic loads such as uneven wind loads. It proposes a constant tension control device for cable-stayed bridges, aiming to achieve precise, rapid, and continuous tension adjustment to ensure stable maintenance of the cable tension at a set target value under various operating conditions. This fundamentally solves the aforementioned problems and significantly improves the long-term safety and durability of bridges.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit the technical solution. Although the applicant has described the utility model in detail with reference to the preferred embodiments, those skilled in the art should understand that any modifications or equivalent substitutions made to the technical solution of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A cable constant tension control device for a cable-stayed bridge, comprising a bridge body (1), characterized in that: The bridge body (1) is equipped with a rope (2) to withstand tension; a box (3) is fixedly installed on both sides of the bridge body (1); a hydraulic oil tank (4) for storing hydraulic working medium is installed inside the box (3); a hydraulic pump (5) for providing hydraulic power is fixedly installed inside the box (3); a first delivery pipe (6) for drawing hydraulic oil from the hydraulic oil tank (4) is fixedly connected to the rear side of the hydraulic pump (5); a second delivery pipe (7) for outputting pressurized oil is fixedly installed on the front side of the hydraulic pump (5); and a... An electromagnetic directional valve (8) is used to control the direction of oil flow; two third delivery pipes (9) for connecting to the return oil circuit are fixedly installed on the rear side of the electromagnetic directional valve (8); two flow pipes (10) for conveying pressure oil or return oil are fixedly connected to the front side of the electromagnetic directional valve (8); one end of the flow pipe (10) extends to the outside of the housing (3) and is fixedly connected to a cylinder (11) as an actuator; a piston rod (12) that can move in both directions is movably fitted inside the cylinder (11), and the movement of the piston rod (12) is used to adjust the tension of the rope (2) connected to it.

2. The cable constant tension control device for cable-stayed bridges according to claim 1, characterized in that, One end of the cylinder (11) is fixedly connected to the bridge body (1), one end of the piston rod (12) is fixedly connected to the rope (2), and one end of the piston rod (12) is fixedly connected to a sealing plate (13).

3. The cable constant tension control device for cable-stayed bridges according to claim 1, characterized in that, One end of the first delivery pipe (6) extends into the interior of the hydraulic oil tank (4), one end of the third delivery pipe (9) extends into the interior of the hydraulic oil tank (4), and one end of the second delivery pipe (7) is fixedly connected to the electromagnetic reversing valve (8).

4. The cable constant tension control device for cable-stayed bridges according to claim 1, characterized in that, The hydraulic oil tank (4) is filled with hydraulic oil. The flow pipes (10) are all connected to the cylinder (11). The hydraulic oil inside the hydraulic oil tank (4) flows into the cylinder (11) through the flow pipes (10). An oil inlet is provided on the top of the hydraulic oil tank (4).

5. The cable constant tension control device for cable-stayed bridges according to claim 1, characterized in that, The electromagnetic reversing valve (8) has a flow groove (14) inside. A first spring (15) is fixedly installed inside the flow groove (14). A movable rod (16) is fixedly installed at one end of the first spring (15). A sealing ring (17) is fixedly installed on the outside of the movable rod (16). An electromagnetic block (18) is fixedly installed on one side of the electromagnetic reversing valve (8). The movable rod (16) is fixedly connected to the electromagnetic block (18).

6. The cable constant tension control device for cable-stayed bridges according to claim 5, characterized in that, The rear side of the flow channel (14) is connected to the second conveying pipe (7) and the third conveying pipe (9), and the front side of the flow channel (14) is connected to the flow pipe (10).

7. The cable constant tension control device for cable-stayed bridges according to claim 1, characterized in that, One end of the rope (2) is fixedly connected to a telescopic rod (19), and a sleeve (20) is provided on the outside of the telescopic rod (19). A second spring (21) is fixedly installed inside the sleeve (20), and a damping sleeve (22) is provided on the outside of the telescopic rod (19).

8. The cable constant tension control device for cable-stayed bridges according to claim 7, characterized in that, One end of the second spring (21) is fixedly connected to the telescopic rod (19), the outer surface of the damping sleeve (22) is in close contact with the inner wall of the sleeve (20), and one end of the sleeve (20) is fixedly connected to the bridge body (1).

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