Lifting appliance for connecting lifting oil jack steel strand with lifting lug of steel box girder

Abstract

The invention relates to the technical field of large-span steel box girder bridge construction, and discloses a lifting oil jack steel strand and steel box girder lifting lug connecting lifting appliance which comprises a lifting beam, a windproof fixing assembly is arranged at the bottom of the lifting beam, and a stress balance optimizing assembly and a buffering assembly are arranged at the bottom of the lifting beam. The stress balance optimization assembly is used for effectively controlling tension balance of each steel strand in the steel box girder hoisting process of a crane, the buffering assembly is used for effectively buffering impact caused by sudden movement when the crane hoists the steel box girder, and the windproof fixing assembly comprises a motor and a support. And the output end of the motor is fixedly connected with a first rotating shaft. By means of the structure, the problems that a combined body of the lifting appliance and the steel box girder shakes due to wind in the air, the gravity center shifts during lifting, the tension of a steel strand is uneven, and parts are damaged due to sudden movement impact can be effectively solved, the stable lifting posture and operation safety can be guaranteed, and local overload damage can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large-span steel box girder bridge construction, in particular to a lifting oil top steel strand and steel box girder lug connecting hoist. BACKGROUND

[0002] The lifting oil top steel strand and steel box girder lug connecting hoist is a special bearing component for realizing reliable connection between the lifting oil top output end steel strand and the steel box girder lug in the steel box girder hoisting construction scene; The existing lifting oil top steel strand and steel box girder lug connecting hoist mainly includes an anchor connection end adapted to the steel strand, a high-strength bearing force transmission component and a hook or pin shaft structure connected with the steel box girder lug, and in operation, the lifting oil top output end steel strand is first locked by the anchor, then the hook or pin shaft is used to realize stable connection with the steel box girder lug, and then the tension generated by the lifting oil top is transmitted to the lug through the bearing component, finally the steel box girder is driven to complete lifting, displacement and other hoisting operations, thereby ensuring the stability and safety of power transmission; The existing hoist and steel box girder combination will produce lateral deviation along the wind direction due to the large windward area of the combination and the complex aerodynamic characteristics, the tension of some hoisting points will suddenly increase and the tension of some hoisting points will be virtually connected, and the steel box girder port will also produce irregular shaking, which will cause the butt joint precision of the adjacent installed beam section to deviate seriously, thereby increasing the closure adjustment difficulty, and therefore the lifting oil top steel strand and steel box girder lug connecting hoist is proposed to solve the above problems. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a lifting oil top steel strand and steel box girder lug connecting hoist, which solves the problems of shaking of the hoist and steel box girder combination in the air hoisting state due to wind force, damage of the steel strand due to uneven stress, and damage of the hoist due to sudden impact when the hoist is static.

[0004] To achieve the above purpose, the present application realizes the following technical scheme: a lifting oil top steel strand and steel box girder lug connecting hoist, comprising: A hoisting beam is provided with a windproof fixing assembly at the bottom, and a stress balance optimization assembly and a buffer assembly are provided at the bottom of the hoisting beam, the stress balance optimization assembly is used to effectively control the tension balance of each steel strand during hoisting of the steel box girder by the crane, and the buffer assembly is used to effectively buffer the impact caused by sudden movement when the crane hoists the steel box girder; The windproof fixing assembly includes a motor and a support. The output end of the motor is fixedly connected to a first rotating shaft. Both ends of the rotating shaft are wound with ropes. One end of the rope is fixedly connected to a movable ring. The movable ring has a fixed ring nested inside it. The outer wall of the fixed ring is fixedly connected to a first fixing block. The bottom of the first fixing block is fixedly connected to a fixing device.

[0005] Preferably, the force balance optimization component includes a counterweight block, a base is fixedly connected to the bottom of the counterweight block, a hydraulic cylinder is fixedly connected to the bottom of the base, a second fixing block is fixedly connected to the side of the hydraulic cylinder away from the base, and a pressure sensor is fixedly connected to the bottom of the second fixing block.

[0006] Preferably, the buffer assembly includes a damper, and both ends of the damper are rotatably connected to connecting seats.

[0007] Preferably, the rotating shaft is rotatably connected inside the support, and the rope is wound in the same direction on the outer wall of the rotating shaft.

[0008] Preferably, the first fixing block is fixedly connected to the side of the fixing device near the fixing ring, and the fixing ring is placed parallel to the shaft directly below it.

[0009] Preferably, the counterweight is fixedly connected to the bottom of the lifting beam, and the central axes of the base and the second fixing block are collinear.

[0010] Preferably, the hydraulic cylinders are arranged in a ring at the bottom of the counterweight, and the connecting seats at both ends of the hydraulic cylinders are perpendicular to each other.

[0011] Preferably, the damper is fixedly connected between the counterweight and the second fixed block, and the side of the connecting seat away from the damper is fixedly connected to the bottom of the counterweight.

[0012] This invention provides a lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder. It has the following advantages: 1. The present invention provides a precise operating benchmark for the motor power output by setting up a motor, a first rotating shaft, a support, a rope, and a cooperative fixing structure composed of a movable ring, a fixed ring, and a first fixing block. With the dual constraints of the support's fixing and guiding functions, the first rotating shaft driven by the motor can stably perform forward and reverse rotation actions.

[0013] 2. The present invention sets up a limiting structure consisting of a counterweight, a pressure sensor, a hydraulic cylinder, a base, and a second fixing block. The hydraulic cylinder adjusts the length of the corresponding steel strand individually to achieve precise control of its tension, and finally strictly controls the force deviation of each steel strand within a preset reasonable range.

[0014] 3. By setting up a damper, connecting seat, limiting block and return spring, the present invention effectively avoids structural damage or loss of posture caused by motion impact by using the piston action in the fast drive damper, and provides basic guarantee for the safety of steel box girder hoisting operation. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram illustrating the anti-sway operation of the present invention; Figure 3 This is a schematic diagram of the windproof fixing component structure of the present invention; Figure 4 This is a schematic diagram of the force balance optimization component structure of the present invention; Figure 5 This is a schematic diagram of the buffer component structure of the present invention.

[0016] The components include: 1. Hanging beam; 2. Windproof fixing component; 21. Motor; 22. Rotating shaft; 23. Support; 24. Rope; 25. Movable ring; 26. Fixed ring; 27. First fixing block; 3. Force balance optimization component; 31. Counterweight block; 32. Base; 33. Hydraulic cylinder; 34. Second fixing block; 35. Pressure sensor; 4. Buffer component; 41. Damper; 42. Connecting seat; 5. Fixing device. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see the appendix Figure 1 - Appendix Figure 3 This invention provides a lifting device for connecting the lifting lugs of the lifting top steel strand to the steel box girder, including a lifting beam 1, a windproof fixing component 2 at the bottom of the lifting beam 1, a force balance optimization component 3 and a buffer component 4 at the bottom of the lifting beam 1. The force balance optimization component 3 is used to effectively control the tension balance of each steel strand during the lifting of the steel box girder by the crane, and the buffer component 4 is used to effectively buffer the impact caused by sudden movement when the crane lifts the steel box girder. The windproof fixing component 2 includes a motor 21 and a support 23. The output end of the motor 21 is fixedly connected to a rotating shaft 22. Both ends of the rotating shaft 22 are wound with ropes 24. One end of the rope 24 is fixedly connected to a movable ring 25. Inside the movable ring 25, fixed rings 26 are nested in a cross pattern. The outer wall of the fixed ring 26 is fixedly connected to a first fixing block 27. The bottom of the first fixing block 27 is fixedly connected to a fixing device 5. The rotating shaft 22 is rotatably connected inside the support 23. The ropes 24 are wound in the same direction on the outer wall of the rotating shaft 22. The first fixing block 27 is fixedly connected to the side of the fixing device 5 near the fixing ring 26. The fixing ring 26 is placed parallel to the bottom of the rotating shaft 22. Specifically, by having the operator activate the motor 21 and the attitude stabilization control program, under the fixed limit and guiding constraint of the support 23, the motor 21 can precisely drive the rotating shaft 22 to rotate synchronously forward or reverse, thereby achieving precise release or retraction of the rope 24 on the rotating shaft 22. During this process, the movable ring 25, the fixed ring 26, and the first fixed block 27 work together to form a stable cooperative fixing structure. The fixed ring 26 serves as a reference anchor point providing a stable support foundation, the first fixed block 27 undertakes the structural bearing function to ensure overall stability, and the movable ring 25 acts as a dynamic adjustment carrier, flexibly responding to changes in the state of the rope 24. These three elements form a linkage mechanism to adapt to changes in the tension of the rope 24 in real time, thereby dynamically adjusting the constraint strength on the fixing device 5. This dynamic adjustment mechanism… This method effectively restricts the rotational freedom of the fixed device 5 in three-dimensional space, establishing an adaptive cancellation mechanism against lateral wind interference. It fundamentally weakens the impact of wind on the combination of the lifting equipment and the steel box girder, preventing irregular swaying of the assembly in the air and ensuring that the lifting posture remains within the preset stable range. Simultaneously, through precise and dynamic control logic, this adjustment method effectively avoids adjustment lag caused by power transmission deviations, reduces structural stress concentration during swaying, and extends the service life of key components such as the lifting equipment and ropes 24. From an operational safety perspective, it completely eliminates the risks of collisions and falls caused by swaying, providing comprehensive technical support for personnel safety, equipment safety, and project quality in high-altitude lifting operations, even in strong winds and gusts. Under complex weather conditions such as wind, the environmental adaptability and anti-interference capability of this technical solution are further highlighted. When the external wind load experiences instantaneous fluctuations or sudden changes in direction, the motor 21 can quickly capture the wind force change signal. The rigid constraint of the support 23 ensures the operating accuracy of the shaft 22, preventing the shaft 22 from shifting or jamming due to external disturbances. This enables the immediate response of the release and retraction of the rope 24. The coordinated fixing structure composed of the movable ring 25, the fixed ring 26, and the first fixed block 27 can quickly adjust the constraint posture based on the fixed ring 26. The structural support of the first fixed block 27 strengthens the overall wind resistance stiffness. At the same time, the dynamic displacement of the movable ring 25 compensates for the lateral force brought by the wind in real time, effectively resisting the irregular pushing and pulling of the wind on the assembly. This self-adaptive... The adjustable capability not only prevents the assembly from swaying or resonating significantly in strong winds, but also reduces the instantaneous load on the lifting tool connection nodes and rope stress points caused by wind impact, preventing fatigue damage to key components due to long-term alternating stress. In addition, in windy seasons or construction environments with complex wind conditions such as high altitudes, this technology can ensure continuous lifting operations without relying on additional temporary wind-resistant facilities, thus reducing the impact of complex weather on construction progress and minimizing safety risks during the construction and dismantling of temporary facilities. It is particularly suitable for the lifting of large steel box girders, ultimately achieving a balance of controllability, safety, and efficiency in the lifting process, providing key technical support for the stable progress of large steel structure lifting projects.

[0019] Please see the appendix Figure 1 and attached Figure 4 This invention provides a lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder. The force balance optimization component 3 includes a counterweight 31, a base 32 fixedly connected to the bottom of the counterweight 31, a hydraulic cylinder 33 fixedly connected to the bottom of the base 32, a second fixing block 34 fixedly connected to the side of the hydraulic cylinder 33 away from the base 32, a pressure sensor 35 fixedly connected to the bottom of the second fixing block 34, the counterweight 31 fixedly connected to the bottom of the lifting beam 1, the central axes of the base 32 and the second fixing block 34 are collinear, the hydraulic cylinders 33 are distributed in a ring at the bottom of the counterweight 31, and the connecting seats 42 at both ends of the hydraulic cylinders 33 are perpendicular to each other. Specifically, a ring-shaped uniformly distributed structure is constructed by the counterweight block 31 at the bottom of the lifting beam 1 and the bottom steel strands. This structure can achieve precise alignment between the center of gravity of the steel box girder and the stress center of the lifting device from a mechanical design perspective, laying a solid foundation for the uniform distribution of load among multiple steel strands and effectively avoiding the problem of local load concentration caused by the offset of the stress center. At the same time, the pressure sensor 35 equipped with the system can perform all-weather real-time dynamic monitoring of the tension value of each steel strand. With its high sensitivity sensing capability, it can promptly capture the tension differences between each steel strand. Once the monitored data exceeds the preset balance threshold, a precise adjustment command is immediately triggered. Under the rigid fixing and limiting action of the base 32 and the second fixing block 34, the hydraulic cylinder 33 can adjust the length of the steel strand with abnormal tension individually. By adjusting the expansion and contraction of the steel strands, the tension can be precisely controlled, ultimately keeping the stress deviation of all steel strands strictly within a preset reasonable range. This synergistic mechanism of structural optimization, real-time monitoring, and dynamic adjustment not only ensures that the load on the steel box girder is uniformly transmitted along the preset path throughout the entire lifting process, effectively avoiding the risk of breakage and wear caused by long-term overload of local steel strands, extending the service life of the steel strands and key components of the lifting equipment, and ensuring the safety of equipment operation, but also improves the posture stability and positional accuracy of the steel box girder lifting operation through real-time tension calibration. This prevents irreversible deformation or unexpected displacement of the steel box girder due to uneven load distribution, further ensuring the quality of the lifting construction. In addition, this technical solution does not require manual intervention. It can achieve tension balance adjustment, reducing the impact of human error on work efficiency and lowering the safety hazards caused by load imbalance. It provides comprehensive technical support for the safe, stable, and efficient operation of crane lifting beam 1 under various working conditions. In the lifting scenarios of heavy-duty components such as large steel box girders, the advantages of this technical solution are more targeted and practical. Heavy-duty steel box girders, due to their large structural dimensions and complex weight distribution, have more stringent requirements for the uniformity and stability of load transfer. The annular uniform distribution structure at the bottom of lifting beam 1 can offset the risk of center-of-gravity shift of heavy-duty components through mechanical balance design. Even if there are local structural differences in the steel box girder, it can still ensure that the overall force is always concentrated at the center of the lifting device, avoiding the amplification of load unevenness due to heavy-duty characteristics. At the same time, pressure... The real-time monitoring function of sensor 35 plays a crucial early warning role in heavy-load scenarios. For example, if minute tension differences in the steel strands under heavy load are not adjusted in time, they can easily lead to a chain reaction of stress concentration as the load increases. The system can capture such subtle changes with its highly responsive monitoring mechanism. Combined with the precise adjustment capability of hydraulic cylinder 33, and with the limiting protection of base 32 and second fixing block 34, it can quickly correct tension deviations and prevent continuous stress impacts on the steel strands that exceed their tolerance range due to heavy loads. In addition, this technology can effectively avoid warping, lateral bending, and other deformations of heavy-load steel box girders due to stress imbalance during lifting and lowering by uniform load distribution and precise attitude control. This ensures the structural integrity of the steel box girder and the accuracy of subsequent installation, while reducing wear and tear on equipment components during heavy-load operations.Reducing maintenance costs and downtime risks in the hoisting of large components not only provides reliable technical support for the safe operation of heavy-duty lifting beams, but also improves the construction efficiency of heavy-duty component hoisting through stable and efficient load control, thus facilitating the smooth implementation of key hoisting stages in large-scale infrastructure projects.

[0020] Please see the appendix Figure 1 and attached Figure 5 This invention provides a lifting device for connecting the lifting cable of the lifting tower steel strand to the lifting lug of the steel box girder. The buffer assembly 4 includes a damper 41. Both ends of the damper 41 are rotatably connected to a connecting seat 42. The damper 41 is fixedly connected between the counterweight block 31 and the second fixed block 34. The side of the connecting seat 42 away from the damper 41 is fixedly connected to the bottom of the counterweight block 31. Specifically, by driving the piston of the damper 41, under the rigid constraint of the connecting seat 42, the piston can move smoothly along a preset trajectory into the groove inside the cylinder. During this process, the hydraulic oil in the groove is compressed simultaneously. Since the hydraulic oil needs to be discharged through a specific oil hole preset on the limit block, it will generate throttling resistance due to the flow channel section limitation when flowing through the oil hole. This resistance can be directly converted into a reverse buffering force opposite to the direction of movement and act on the piston. Then, through the connection relationship between the piston and the lifting device and the steel box girder, the instantaneous speed of such moving parts is gradually reduced, effectively weakening the impact load generated during the movement, avoiding deformation of the lifting device structure, loosening of the steel box girder connection nodes, or loss of overall posture due to impact. This lays the foundation for the structural safety of the steel box girder lifting operation. At the same time, the hydraulic oil in the throttling... The heat generated by molecular friction during the flow process can be quickly exchanged with the surrounding air through the outer wall of the damper 41 cylinder and dissipated naturally, preventing local overheating caused by energy accumulation inside the system, avoiding abnormal changes in hydraulic oil viscosity or aging and damage to the seals of the damper 41, and ensuring the long-term stable operation of the damper 41 and the entire hoisting system. After the external impact force disappears, the reset spring built into the damper 41 will quickly release the stored elastic potential energy, pushing the plunger and limit block to accurately return to the initial working position, ensuring that the damper 41 is always in a ready-to-respond state and can immediately cope with the next possible impact load, achieving continuous and reliable buffer protection. This closed-loop working mechanism from buffering and unloading to heat dissipation to automatic reset can significantly improve the performance of steel box girders. The dynamic stability during hoisting reduces wear and tear on equipment components, extends the service life of the lifting gear, damper 41, and steel box girder connecting components, and reduces the risk of safety accidents caused by impacts through the synergistic effect of real-time buffering and automatic reset. It also avoids work interruptions due to equipment failure, further ensuring the efficient and safe operation of crane hoisting. This provides key technical support for the smooth progress of large steel box girder hoisting projects. At the two critical operational nodes of steel box girder lifting and positioning, the protective advantages of the damper 41 are more targeted and practical, accurately addressing the instantaneous impact risks that are prone to occur at these nodes. At the moment of steel box girder hoisting, the sudden application of the lifting gear's traction force and the transfer of the component's own weight can easily generate upward instantaneous impact loads. At this time, the damper... Under the constraint of the connecting seat 42, the plunger 41 moves into the cylinder. The reverse buffer force generated by the compressed hydraulic oil can smoothly offset the impact kinetic energy at the moment of lifting, avoiding stress concentration at the connection between the lifting device and the steel box girder due to a sudden increase in force, preventing local structural damage to the steel box girder or deformation of the lifting device connectors, and ensuring a smooth and controllable lifting process. At the moment of the steel box girder's placement, due to the component's own weight and placement inertia, a downward impact load is easily generated, which may lead to collision between the steel box girder and the installation foundation or deviation in placement accuracy. At this time, the damper 41 can convert the impact energy at the moment of placement into the throttling resistance and heat energy of the hydraulic oil through the same throttling buffer mechanism, slowing down the falling speed of the steel box girder, achieving a soft landing effect, and avoiding damage to the bottom structure of the steel box girder or the installation foundation caused by a hard collision.Simultaneously ensuring the accuracy of the placement, and furthermore, after these two stages are completed, the return spring can quickly push the plunger and limit block back to their initial state. If fine-tuning of the position is required after lifting or a second lifting is needed after placement, the damper 41 can immediately enter the working state without additional adjustments. This improves the safety and stability of key node operations, reduces the waiting time between nodes, and further ensures the overall efficiency and construction quality of the large steel box girder hoisting project.

[0021] Working principle: When the lifting device and the steel box girder assembly are in the air-lifting state, before the windproof fixing component 4 is put into operation, the rope 24 is in a loose state. When it sways due to wind force, the operator starts the motor 21. Under the dual constraints of the fixed limit and guiding function of the support 23, the motor 21 drives the first rotating shaft 22 to rotate synchronously. The first rotating shaft 22 realizes the retraction operation of the rope 24 connected to it through the forward or reverse rotation operation mode. During this process, the movable ring 25 associated with the rope 24, the fixed ring 26 that plays the role of reference fixing, and the first fixing block 27 that provides structural support cooperate with each other to form a cooperative fixing structure. By adjusting the tightness of the rope 24 in real time, the constraint strength on the fixing device 5 is dynamically changed, thereby effectively limiting the rotational freedom of the fixing device 5 in space. Finally, it counteracts the lateral interference force generated by the wind on the lifting device and the steel box girder assembly, prevents the two as a whole from swaying irregularly in the air, and ensures the posture stability and operation safety during the lifting process. When the crane lifts and moves the steel box girder using the lifting device, the counterweight block 31 at the bottom of the lifting beam 1 and the bottom steel strands form a ring-shaped uniform distribution structure. This structure can keep the center of gravity of the steel box girder and the force center of the lifting device coincide, laying the foundation for uniform load distribution. At the same time, the pressure sensor 35 monitors the tension value of each steel strand in real time. If a difference in tension is detected among the steel strands, an adjustment command is immediately triggered. Under the fixed limit action of the base 32 and the second fixed block 34, the hydraulic cylinder 33 adjusts the length of the corresponding steel strand individually to change its tension. Finally, the force deviation of each steel strand is controlled within a preset reasonable range, ensuring that the load is evenly transmitted during the lifting of the steel box girder and avoiding damage to local steel strands due to overload. When the crane lifts the steel box girder with the spreader or when the steel box girder moves suddenly in the air, the plunger in the drive damper 41 is activated. Under the fixed constraint of the connecting seat 42, the plunger moves into the groove inside the cylinder, compressing the hydraulic oil in the groove. Since the hydraulic oil needs to be discharged through the oil hole preset on the limit block, the oil will generate throttling resistance when flowing through the oil hole. This resistance is converted into a reverse buffer force, which acts on the plunger, thereby smoothly reducing the speed of the spreader and the moving parts such as the steel box girder, avoiding structural damage or loss of posture due to the impact of the movement. At the same time, the heat energy generated by the friction of the hydraulic oil during the throttling process is exchanged with the air through the outer wall of the cylinder and dissipated in time, preventing the accumulation of energy inside the system and causing overheating problems.

Claims

1. A lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder, characterized in that, include: The lifting beam (1) is provided with a windproof fixing component (2) at the bottom. The lifting beam (1) is provided with a force balance optimization component (3) and a buffer component (4) at the bottom. The force balance optimization component (3) is used to enable the crane to effectively control the tension balance of each steel strand during the lifting of the steel box beam. The buffer component (4) is used to enable the crane to effectively buffer the impact caused by sudden movement when lifting the steel box beam. The windproof fixing component (2) includes a motor (21) and a support (23). The output end of the motor (21) is fixedly connected to a first rotating shaft (22). Both ends of the rotating shaft (22) are wrapped with ropes (24). One end of the rope (24) is fixedly connected to a movable ring (25). The movable ring (25) has a fixed ring (26) nested inside it. The outer wall of the fixed ring (26) is fixedly connected to a first fixing block (27). The bottom of the first fixing block (27) is fixedly connected to a fixing device (5).

2. The lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder according to claim 1, characterized in that, The force balance optimization component (3) includes a counterweight (31), a base (32) is fixedly connected to the bottom of the counterweight (31), a hydraulic cylinder (33) is fixedly connected to the bottom of the base (32), a second fixing block (34) is fixedly connected to the side of the hydraulic cylinder (33) away from the base (32), and a pressure sensor (35) is fixedly connected to the bottom of the second fixing block (34).

3. The lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder according to claim 2, characterized in that, The buffer assembly (4) includes a damper (41), and both ends of the damper (41) are rotatably connected to a connecting seat (42).

4. The lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder according to claim 1, characterized in that, The shaft (22) is rotatably connected inside the support (23), and the rope (24) is wound in the same direction on the outer wall of the shaft (22).

5. The lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder according to claim 1, characterized in that, The first fixing block (27) is fixedly connected to the side of the fixing device near the fixing ring (26), and the fixing ring (26) is placed parallel to the shaft (22) directly below it.

6. The lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder according to claim 2, characterized in that, The counterweight (31) is fixedly connected to the bottom of the lifting beam (1), and the central axes of the base (32) and the second fixing block (34) are arranged in the same direction.

7. The lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder according to claim 2, characterized in that, The hydraulic cylinders (33) are arranged in a ring at the bottom of the counterweight (31), and the connecting seats (42) at both ends of the hydraulic cylinders (33) are perpendicular to each other.

8. The lifting device for connecting the lifting cable of the hydraulic jack to the lifting lug of the steel box girder according to claim 3, characterized in that, The damper (41) is fixedly connected between the counterweight (31) and the second fixed block (34), and the connecting seat (42) is fixedly connected to the bottom of the counterweight (31) on the side away from the damper (41).

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