Pier jacking device

Abstract

The invention provides a pier jacking device which comprises a lifting frame, a fixing assembly, a positioning frame, a driving oil cylinder and a chain wheel assembly, the fixing assembly comprises a first fixing part and a second fixing part, and the first fixing part and the second fixing part are arranged at the upper end and the lower end of the lifting frame correspondingly; the first fixing part and the second fixing part are respectively connected with a to-be-lifted bridge pier; the chain wheel assembly is connected with the driving oil cylinder and the lifting frame, the driving component drives the chain wheel assembly to move, the chain wheel assembly drives the lifting frame to move, the lifting frame drives the pier to move, a piston of the driving oil cylinder ascends by a certain distance, and the ascending distance of a pier ascending piston rod is twice, so that the jacking disassembly work of the pier can be completed in a limited space. No large hoisting machinery is needed, the limitation that a bridge pier base needs a large-area foundation is overcome, the length of the bridge pier sections is greatly increased, the number of the bridge pier sections can be reduced with the same height of the bridge pier, the splicing frequency is reduced, and the efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of emergency repair of bridge piers, and in particular relates to a bridge pier jacking device. Background Art

[0002] The number of various types of high-pier and long-span bridges on traffic routes has increased dramatically, and most of them are important traffic nodes. The probability of the entire traffic line being paralyzed due to the damage of bridges in wars and natural disasters is getting higher and higher. In the future, to ensure the formation of full-area mobility and rapid mobility capabilities, emergency repair of high-pier and long-span bridges is an unavoidable realistic problem. However, due to various reasons such as structure, weight and design functions, it is difficult for existing equipment to fully and effectively solve the contradiction between the adaptability of large-span and high-height structures and the timeliness of emergency repairs. Due to the damage of bridges due to natural disasters, the entire traffic line was paralyzed, and the repair of bridge piers was difficult. A large number of workers were required to participate, and large-scale engineering machinery was required for cooperation, and the erection time was long.

[0003] The existing emergency repair piers are erected by mainly using the pole pulling method, hydraulic jacking method, and crane hoisting method. Both the pole pulling method and the crane hoisting method require manual assembly at high altitude, and the safety of personnel cannot be guaranteed. Although the hydraulic jacking method lifts the pier as a whole, the types and quantity of steel components are large, and the time period is too long, a large number of workers are required, and large-scale lifting machinery is required for the erection, which takes a long time. Summary of the invention

[0004] The invention provides a bridge pier lifting device, which can complete the lifting and disassembly work of the bridge pier in a limited space without the participation of large-scale lifting machinery, thus overcoming the limitation that the bridge pier base requires a large-area foundation.

[0005] The present invention provides a bridge pier lifting device, comprising a lifting frame; a fixing assembly, arranged on the lifting frame, connected to two adjacent bridge piers arranged in a stacked manner, comprising a first fixing component and a second fixing component, wherein the first fixing component is arranged at the upper end of the lifting frame, the first fixing component is connected to the bridge pier located above, the second fixing component is arranged at the lower end of the lifting frame, and the second fixing component is connected to the bridge pier located below; a positioning frame, arranged inside the lifting frame, one end of which is arranged on the ground, and the height is greater than the height of the lifting frame; a plurality of driving cylinders, wherein the plurality of driving cylinders are arranged inside the positioning frame and are arranged in the circumferential direction of the positioning frame; a sprocket assembly, which has a plurality of components corresponding to the driving cylinders, comprising a moving sprocket component, a fixed sprocket component and a chain component, wherein the moving sprocket component is arranged at the piston end of the driving cylinder, the fixed sprocket component is arranged at the top of the positioning frame, the starting end of the chain component is connected to the fixed sprocket component, the chain component bypasses the moving sprocket component and the fixed sprocket component in sequence, and the tail end of the chain component is connected to the lifting frame.

[0006] In some optional embodiments, the fixed sprocket component includes a fixed sprocket, a fourth pin shaft and a first support, the first support is arranged on the positioning frame, and the fixed sprocket is fixed to the first support through the fourth pin shaft.

[0007] In some optional embodiments, the movable sprocket component includes a movable sprocket, a second pin shaft and a second support, the second support is arranged on the piston, and the movable sprocket is fixed to the second support via the second pin shaft.

[0008] In some optional embodiments, the chain component includes a chain, a third fixed component and a fourth fixed component, the third fixed component and the fourth fixed component are respectively arranged at the beginning and end of the chain, the third fixed component is connected to the first support, and the fourth fixed component is connected to the lifting frame.

[0009] In some optional embodiments, the third fixing component includes a fifth pin and a chain fixing plate, and the fifth pin connects the chain fixing plate and the first support.

[0010] In some optional embodiments, the fourth fixed component includes a chain connecting seat, a chain connecting transition shaft and an adjustment nut, the chain connecting transition shaft is arranged at the end of the chain, the adjustment nut connects the chain connecting transition shaft and the chain connecting seat, and the chain connecting seat is connected to the lifting frame.

[0011] In some optional embodiments, the first fixed component includes a third support, a movable support ear plate and a spring, the third support is arranged on the lifting frame, the movable support ear plate is rotatably connected to the third support, and the spring connects the movable support ear plate and the lifting frame.

[0012] In some optional embodiments, an ear plate is provided at the bottom of the pier, and in two stacked piers, the ear plate of the upper pier is connected to the movable supporting ear plate via a fourth pin shaft.

[0013] In some optional embodiments, the second fixing component includes a third pin shaft and a locking double-ear plate, the locking double-ear plate is arranged on the lifting frame, and the third pin shaft connects the pier and the locking double-ear plate.

[0014] In some optional embodiments, ear plates are provided at the bottom of the pier, and in two stacked piers, the ear plates of the lower pier are connected to the locking double ear plates via the third pin shaft.

[0015] The beneficial effects brought by the present invention are as follows:

[0016] It can be seen from the above scheme that an embodiment of the present invention provides a pier jacking device, which includes a lifting frame, a fixing assembly, a positioning frame, a driving cylinder and a sprocket assembly. The fixing assembly includes a first fixing component and a second fixing component, which are respectively arranged at the upper end and the lower end of the lifting frame, and the first fixing component and the second fixing component are respectively connected to the pier to be lifted, which can ensure that the lifting frame is tightly connected to the pier and will not interfere with each other during the lifting process of the next section of the pier; the sprocket assembly connects the driving cylinder and the first fixing component, the driving component drives the sprocket assembly to move, the sprocket assembly drives the lifting frame to move, and the lifting frame drives the pier to move, the sprocket assembly includes a moving sprocket component, a fixed sprocket component and a chain component, the moving sprocket component is arranged at the piston end of the driving cylinder, the fixed sprocket component is arranged at the top of the positioning frame, the starting end of the chain component is connected to the fixed sprocket component, and the chain component is sequentially connected to the fixed sprocket component. By bypassing the moving sprocket component and the fixed sprocket component, the tail end of the chain component is connected to the lifting frame, so that the piston rises a certain distance, and the bridge pier rises twice the distance of the piston rod. The jacking and disassembly work of the bridge pier can be completed in a limited space without the participation of large-scale lifting machinery, overcoming the limitation that the bridge pier base requires a large foundation area, which also greatly increases the length of the bridge pier section. The same bridge pier height can reduce the number of bridge pier sections, reduce the number of assembly times, improve efficiency and reduce assembly time; there are multiple driving cylinders, and the multiple driving cylinders are located inside the positioning frame and are arranged circumferentially on the positioning frame. The sprocket assembly and the driving cylinders correspond to each other one by one to prevent the lifting frame from being offset and squeezed by the guide frame; the positioning frame is arranged inside the lifting frame, and one end of the positioning frame is arranged on the ground, and the height is greater than the height of the lifting frame. The positioning frame is used to support the fixed sprocket component and lift the fixed sprocket component to a certain distance to facilitate the operation of the sprocket assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a bridge pier lifting device provided by an embodiment of the present invention in a non-lifting state;

[0018] Figure 2 for Figure 1 A schematic structural diagram of the bridge pier jacking device in the jacking state of the provided embodiment;

[0019] Figure 3 A schematic diagram of the structure of a sprocket assembly provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the structure of a lifting frame provided by an embodiment of the present invention;

[0021] Figure 5 An enlarged structural schematic diagram of a first fixing component provided in one embodiment of the present invention;

[0022] Figure 6An enlarged structural schematic diagram of a second fixing component provided in one embodiment of the present invention;

[0023] Figure 7 A schematic diagram of a lifting frame connected to a bridge pier provided in an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of the installation structure of a lug plate on a bridge pier provided by an embodiment of the present invention;

[0025] Fig. 9 A schematic diagram of the connection between the ear plate and the first fixing component provided in one embodiment of the present invention;

[0026] Fig.10 A schematic diagram of the connection between a second ear plate and a second fixing component provided in an embodiment of the present invention.

[0027] In the figure, 1-lifting frame; 21-first fixed component; 211-third support; 212-movable supporting ear plate; 213-spring; 241-fourth pin shaft; 22-second fixed component; 221-third pin shaft; 222-locking double ear plate; 3-positioning frame; 4-driving cylinder; 5-sprocket assembly; 51-moving sprocket component; 511-moving sprocket; 512-second pin shaft; 513-second support; 52-fixed sprocket component; 521-fixed sprocket; 522-first pin shaft; 523-first support; 53-chain component; 531-chain; 532-third fixed component; 5321-fifth pin shaft; 5322-chain fixing plate; 533-fourth fixed component; 5331-chain connecting seat; 5332-chain connecting transition shaft; 5333-adjusting nut; 6-ear plate. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The number of various types of high-pier and long-span bridges on traffic routes has increased dramatically, and most of them are important traffic nodes. The probability of the entire traffic line being paralyzed due to the damage of bridges in wars and natural disasters is getting higher and higher. In the future, to ensure the formation of full-area mobility and rapid mobility capabilities, emergency repair of high-pier and long-span bridges is an unavoidable realistic problem. However, due to various reasons such as structure, weight and design functions, it is difficult for existing equipment to fully and effectively solve the contradiction between the adaptability of large-span and high-height structures and the timeliness of emergency repairs. Due to the damage of bridges due to natural disasters, the entire traffic line was paralyzed, and the repair of bridge piers was difficult. A large number of workers were required to participate, and large-scale engineering machinery was required for cooperation, and the erection time was long.

[0030] The existing emergency repair piers are erected by mainly using the pole pulling method, hydraulic jacking method, and crane hoisting method. Both the pole pulling method and the crane hoisting method require manual assembly at high altitude, and the safety of personnel cannot be guaranteed. Although the hydraulic jacking method lifts the pier as a whole, the types and quantity of steel components are large, and the time period is too long, a large number of workers are required, and large-scale lifting machinery is required for the erection, which takes a long time.

[0031] The invention provides a bridge pier lifting device, which can complete the lifting and disassembly work of the bridge pier in a limited space without the participation of large-scale lifting machinery, thus overcoming the limitation that the bridge pier base requires a large-area foundation.

[0032] The following is in conjunction with the instruction manual Figures 1 to 10 The bridge pier lifting device is described in detail.

[0033] The present application provides a bridge pier lifting device, which includes: a lifting frame 1; a fixing assembly, which is arranged on the lifting frame 1 and connected to two adjacent bridge piers arranged in a stacked manner, including a first fixing component 21 and a second fixing component 22, wherein the first fixing component 21 is arranged at the upper end of the lifting frame 1, and the first fixing component is connected to the bridge pier located above, and the second fixing component 22 is arranged at the lower end of the lifting frame 1, and the second fixing component is connected to the bridge pier located below; a positioning frame 3, which is arranged inside the lifting frame 1, one end of which is arranged on the ground, and the height is greater than that of the lifting frame 1 height; a driving cylinder 4 having multiple driving cylinders 4 located inside the positioning frame 3 and arranged in the circumferential direction of the positioning frame 3; a sprocket assembly 5 having multiple one-to-one correspondences with the driving cylinders 4, including a moving sprocket component 51, a fixed sprocket component 52 and a chain component 53, the moving sprocket component 51 being arranged at the piston end of the driving cylinder 4, the fixed sprocket component 52 being arranged at the top of the positioning frame 3, the starting end of the chain component 53 being connected to the fixed sprocket component 52, the chain component 53 bypassing the moving sprocket component 51 and the fixed sprocket component 52 in sequence, and the tail end of the chain component being connected to the lifting frame 1.

[0034] Specifically, the pier lifting device includes a lifting frame 1, a fixing assembly, a positioning frame 3, a driving cylinder 4 and a sprocket assembly 5. The fixing assembly includes a first fixing component 21 and a second fixing component 22. The first fixing component 21 and the second fixing component 22 are respectively arranged at the upper end and the lower end of the lifting frame 1. The first fixing component 21 and the second fixing component 22 are respectively connected to the pier to be lifted, which can not only ensure that the lifting frame 1 is tightly connected to the pier, but also will not interfere with the lifting process of the next section of the pier; the sprocket assembly 5 is connected to the driving cylinder 4 and the first support 523. The driving component drives the sprocket assembly 5 to move, the sprocket assembly 5 drives the lifting frame 1 to move, and the lifting frame 1 drives the pier to move. The sprocket assembly 5 includes a moving sprocket component 51, a fixed sprocket component 52 and a chain component 53. The moving sprocket component 51 is arranged at the piston end of the driving cylinder 4, the fixed sprocket component 52 is arranged at the top of the positioning frame 3, the starting end of the chain component 53 is connected to the fixed sprocket component 52, and the chain component 53 is sequentially connected to the fixed sprocket component 52. Bypassing the moving sprocket component 51 and the fixed sprocket component 52, the tail end of the chain component is connected to the lifting frame 1 so that the piston rises a certain distance, and the bridge pier rises twice the distance of the piston rod. The jacking and disassembly work of the bridge pier can be completed in a limited space without the participation of large-scale lifting machinery, overcoming the limitation that the bridge pier base requires a large area of ​​foundation, which also greatly increases the length of the bridge pier section. The same bridge pier height can reduce the number of bridge pier sections, reduce the number of assembly times, improve efficiency and reduce assembly time; there are multiple driving cylinders 4, and the multiple driving cylinders 4 are located inside the positioning frame 3. They are arranged circumferentially in the positioning frame 3, and the sprocket assembly 5 and the driving cylinder 4 correspond to each other one by one to prevent the lifting frame 1 from being offset and squeezed by the guide frame; the positioning frame 3 is arranged inside the lifting frame, and one end of the positioning frame 3 is arranged on the ground, and the height is greater than the height of the lifting frame 1. The positioning frame 3 is used to support the fixed sprocket component 52 and lift the fixed sprocket component 52 to a certain distance to facilitate the operation of the sprocket assembly 5.

[0035] Furthermore, the bridge pier lifting device does not need to be disassembled, is embedded in the middle of the bridge pier, does not occupy the position of the bridge pier seat, and when the bridge pier needs to be disassembled, it is no longer necessary to send a large lifting machinery, and can be disassembled manually, and the disassembly process is reversed to the assembly process. The bridge pier lifting device of the present invention has a simple structure, requires a small number of workers, has high assembly efficiency, short assembly time, and high safety.

[0036] Furthermore, the guide frame 2 is composed of a steel structure, and the lifting frame 1 plays a guiding role.

[0037] In some optional embodiments, the fixed sprocket component 52 includes a fixed sprocket 521 , a first pin shaft 522 and a first support 523 . The first support 523 is disposed on the positioning frame 3 , and the fixed sprocket 521 is fixed to the first support 523 via the first pin shaft 522 .

[0038] Specifically, the fixed sprocket 521 serves to guide the chain 531 .

[0039] In some optional embodiments, the dynamic sprocket component 51 includes a dynamic sprocket 511 , a second pin shaft 512 and a second support 513 . The second support 513 is disposed on the piston 41 , and the dynamic sprocket 511 is fixed to the second support 513 via the second pin shaft 512 .

[0040] Specifically, the function of the moving sprocket 511 is to drive the chain 531 and the lifting frame 1 to move. The second support 513 is a moving sprocket seat, and the second support 513 is bolted to the upper end of the piston rod of the driving cylinder 4. The driving cylinder 4 provides power for the movement of the moving sprocket 511. If the jacking is only carried out by the driving cylinder 4, the extension length of the driving cylinder 4 piston is the same as the jacking height of the pier, which will cause the length of the cylinder to be too long. In order to reduce the length of the cylinder, a moving sprocket 511 needs to be added in the middle of the chain 531 transmission, so that the jacking height is twice the jacking height of the cylinder. The jacking height is doubled under the limited length of the cylinder, which greatly increases the length of the pier section. The same height of the pier can reduce the number of pier sections, reduce the number of assembly times, improve efficiency and reduce assembly time; in order to stably fix the pier on the jacking mechanism, the existing mechanism is to lock the pier on the jacking mechanism, which requires manual operation, and the danger of manual operation increases.

[0041] In some optional embodiments, the chain component 53 includes a chain 531, a third fixed component 532 and a fourth fixed component 533, the third fixed component 532 and the fourth fixed component 533 are respectively arranged at the beginning and end of the chain 531, the third fixed component 532 is connected to the first support 523 of the fixed sprocket component 52, and the fourth fixed component 533 is connected to the lifting frame 1.

[0042] Specifically, the chain 531 is meshed with the fixed sprocket 521 and the movable sprocket 511 respectively.

[0043] Specifically, the third fixing component 532 includes a fifth pin 5321 and a chain fixing plate 5322, wherein the fifth pin 5321 connects the chain fixing plate 5322 and the first support 523. The fourth fixing component 533 includes a chain connecting seat 5331, a chain connecting transition shaft 5332 and an adjusting nut 5333, wherein the chain connecting transition shaft 5332 is disposed at the end of the chain 531, and the adjusting nut 5333 connects the chain connecting transition shaft 5332 and the chain connecting seat 5331. The tension of the chain 531 can be adjusted by adjusting the nut 5333. The chain connecting seat 5331 is connected to the lifting frame 1, thereby fixing the chain component 53 to the lifting frame 1.

[0044] In some optional embodiments, the first fixing member 21 includes a third support 211, a movable support ear plate 212 and a spring 213, the third support 211 is disposed on the lifting frame 1, the movable support ear plate 212 is rotatably connected to the third support 211, and the spring 213 connects the movable support ear plate 212 and the lifting frame 1. The third support 211 is a support ear plate fixing seat.

[0045] Specifically, the first fixing component 21 is used to connect with the bridge pier, and the first fixing component 21 is arranged on the top of the lifting frame 1. Optionally, a plurality of first fixing components 21 are provided, and the plurality of first fixing components 21 are arranged in the circumferential direction of the lifting frame 1. The movable support ear plate 212 is connected to the third support 211 through a pin shaft, and the movable support ear plate 212 is rotatably connected around the third support 211 through a pin shaft. The ear plate 6 is arranged at the bottom of the bridge pier, and in two stacked bridge piers, the ear plate 6 of the upper bridge pier is connected to the movable support ear plate 212 through a fourth pin shaft 241. The fourth pin shaft 241 is a fixed pin shaft.

[0046] Furthermore, the upper end of the lifting frame 1 supports the ear plate 6 at the bottom of the pier through the movable supporting ear plate 212, one end of the spring 213 is fixed to the movable supporting ear plate 212, and the other end of the spring 213 is fixed to the lifting frame 1. The spring 213 provides a pulling force to reset the movable supporting ear plate 212 when it rotates, and has the function of quickly and reliably connecting or separating with the pier.

[0047] In some optional embodiments, the bridge pier includes an ear plate 6 , and the ear plate 6 is connected to the movable supporting ear plate 212 via a fourth pin shaft 241 .

[0048] Specifically, the lug plate 6 is provided at the bottom of the pier. Among the two stacked piers, the lug plate 6 of the upper pier is connected to the movable support lug plate 212 through the fourth pin 241, and the fourth pin 241 is a fixed pin. The lug plate 6 of the upper pier is connected to any one of the first fixed components 21 on the top of the lifting frame 1. The first fixed component 21 includes a third support 211, a movable support lug plate 212 and a spring 213. The third support 211 is provided on the lifting frame 1. The movable support lug plate 212 is rotatably connected to the third support 211. The spring 213 connects the movable support lug plate 212 and the lifting frame 1. The lug plate 6 is connected to the movable support lug plate 212 through the fourth pin 241.

[0049] In some optional embodiments, the second fixing component 22 includes a third pin shaft 221 and a locking double-ear plate 222 , the locking double-ear plate 222 is arranged on the lifting frame 1 , and the third pin shaft 221 connects the pier and the locking double-ear plate 222 .

[0050] Specifically, the second fixing component 22 is used to connect with the bridge pier, and the second fixing component 22 is arranged at the bottom of the lifting frame 1. Optionally, a plurality of second fixing components 22 are provided, and the plurality of second fixing components 22 are arranged in the circumferential direction of the lifting frame 1. The bottom of the bridge pier is provided with an ear plate 6, and the ear plate 6 of the bridge pier located at the bottom of the two stacked bridge piers is connected to the locking double ear plate 222 through the third pin shaft 221. The locking double ear plate 222 is welded to the bottom of the lifting frame 1.

[0051] In some optional embodiments, the bridge pier further includes an ear plate 6 , and the ear plate 6 is connected to the locking double ear plate 222 via a third pin shaft 221 .

[0052] Specifically, the bottom of the pier is provided with an ear plate 6, and among the two stacked piers, the ear plate 6 of the lower pier is connected to the locking double ear plate 222 via a third pin 221. The bottom of the lifting frame 1 is fixedly connected to the locking double ear plate 222, and optionally, the locking double ear plate 222 is welded to the bottom of the lifting frame 1.

[0053] Optionally, the ear plate 6 located on the upper pier is connected to the movable supporting ear plate 212 through the fourth pin shaft 241, and the ear plate 6 located on the lower pier is connected to the locking double ear plate 222 through the third pin shaft 221, which can ensure the stability of the pier fixation without the need for manual climbing to plug and pull out the pin shafts. It is only necessary to manually plug and pull out the third pin shaft 221 connecting the pier located at the lower position and the bottom of the lifting frame 1 to complete the fixing and separation of the pier, which ensures the safety of manual operation and reduces the operation time, thereby improving the jacking efficiency of the mechanism. When jacking again, the movable supporting ear plate 212 at the upper end of the lifting frame can actively avoid, and the ear plate 6 returns to its position to continue to complete the next jacking.

[0054] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A bridge pier lifting device, characterized in that: include: Lifting framework (1); A fixing assembly, arranged on the lifting frame (1), connected to two adjacent bridge piers arranged in a stacked manner, comprising a first fixing component (21) and a second fixing component (22), wherein the first fixing component (21) is arranged at the upper end of the lifting frame (1), and the first fixing component is connected to the bridge pier located above, and the second fixing component (22) is arranged at the lower end of the lifting frame (1), and the second fixing component is connected to the bridge pier located below; A positioning frame (3) is arranged inside the lifting frame (1), one end of which is arranged on the ground and has a height greater than that of the lifting frame (1); A plurality of driving cylinders (4) are provided, wherein the plurality of driving cylinders (4) are located inside the positioning frame (3) and are arranged in the circumferential direction of the positioning frame (3); The sprocket assembly (5) has a plurality of sprockets corresponding to the driving cylinder (4) one by one, including a moving sprocket component (51), a fixed sprocket component (52) and a chain component (53), wherein the moving sprocket component (51) is arranged at the piston end of the driving cylinder (4), the fixed sprocket component (52) is arranged at the top of the positioning frame (3), the starting end of the chain component (53) is connected to the fixed sprocket component (52), the chain component (53) bypasses the moving sprocket component (51) and the fixed sprocket component (52) in sequence, and the tail end of the chain component is connected to the lifting frame (1).

2. The bridge pier lifting device according to claim 1, characterized in that: The fixed sprocket component (52) comprises a fixed sprocket (521), a first pin shaft (522) and a first support (523); the first support (523) is arranged on the positioning frame (3); and the fixed sprocket (521) is fixed to the first support (523) via the first pin shaft (522).

3. The bridge pier lifting device according to claim 1, characterized in that: The movable sprocket component (51) comprises a movable sprocket (511), a second pin shaft (512) and a second support seat (513); the second support seat (513) is arranged on the piston (41); and the movable sprocket (511) is fixed to the second support seat (513) via the second pin shaft (512).

4. The bridge pier lifting device according to claim 1, characterized in that: The chain component (53) comprises a chain (531), a third fixing component (532) and a fourth fixing component (533); the third fixing component (532) and the fourth fixing component (533) are respectively arranged at the beginning and end of the chain (531); the third fixing component (532) is connected to the first support (523), and the fourth fixing component (533) is connected to the lifting frame (1).

5. The bridge pier lifting device according to claim 4, characterized in that: The third fixing component (532) includes a fifth pin shaft (5321) and a chain fixing plate (5322), and the fifth pin shaft (5321) connects the chain fixing plate (5322) and the first support (523).

6. The bridge pier lifting device according to claim 5, characterized in that: The fourth fixed component (533) includes a chain connection seat (5331), a chain connection transition shaft (5332) and an adjusting nut (5333), wherein the chain connection transition shaft (5332) is arranged at the end of the chain (531), and the adjusting nut (5333) connects the chain connection transition shaft (5332) and the chain connection seat (5331), and the chain connection seat (5331) is connected to the lifting frame (1).

7. The bridge pier lifting device according to claim 1, characterized in that: The first fixed component (21) comprises a third support (211), a movable support ear plate (212) and a spring (213); the third support (211) is arranged on the lifting frame (1); the movable support ear plate (212) is rotatably connected to the third support (211); and the spring (213) connects the movable support ear plate (212) and the lifting frame (1).

8. The bridge pier lifting device according to claim 7, characterized in that: An ear plate (6) is arranged at the bottom of the bridge pier, and in two stacked bridge piers, the ear plate (6) of the upper bridge pier is connected to the movable support ear plate (212) via a fourth pin shaft (241).

9. The bridge pier lifting device according to claim 1, characterized in that: The second fixing component (22) comprises a third pin shaft (221) and a locking double-ear plate (222), wherein the locking double-ear plate (222) is arranged on the lifting frame (1), and the third pin shaft (221) connects the bridge pier and the locking double-ear plate (222).

10. The bridge pier lifting device according to claim 9, characterized in that: An ear plate (6) is arranged at the bottom of the pier, and in two stacked piers, the ear plate (6) of the pier located at the bottom is connected to the locking double ear plate (222) via the third pin shaft (221).

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