A bridge pier jacking device

Abstract

This invention provides a bridge pier lifting device, including a lifting frame, a fixing component, a positioning frame, a drive cylinder, and a sprocket assembly. The fixing component includes a first fixing part and a second fixing part, which are respectively disposed at the upper and lower ends of the lifting frame and are respectively connected to the bridge pier to be lifted. The sprocket assembly connects the drive cylinder and the lifting frame. The drive component drives the sprocket assembly to move, the sprocket assembly drives the lifting frame to move, and the lifting frame drives the bridge pier to move. The piston of the drive cylinder rises a certain distance, twice the distance the piston rod of the bridge pier rises. This device can complete the lifting and dismantling of the bridge pier in a limited space without the need for large lifting machinery, overcoming the limitation that the bridge pier base requires a large area of ​​foundation. This also greatly increases the length of the bridge pier section. For the same bridge pier height, the number of bridge pier sections can be reduced, reducing the number of assembly steps and improving efficiency.

Description

Technical Field

[0001] This invention belongs to the field of emergency repair technology for bridge piers, and specifically relates to a bridge pier lifting device. Background Technology

[0002] The number of high-pier, long-span bridges along transportation routes is increasing dramatically, and most of them are important transportation nodes. The probability of entire transportation lines being paralyzed due to bridge damage caused by war or natural disasters is growing. In the future, ensuring comprehensive and rapid mobility is crucial, and the emergency repair and restoration of high-pier, long-span bridges is an unavoidable practical challenge. However, existing equipment, due to structural, weight, and design limitations, struggles to fully and effectively resolve the contradiction between the adaptability of large-span, high-height structures and the timeliness of repairs. When bridges are damaged by natural disasters, leading to the paralysis of entire transportation lines, bridge pier repairs are difficult, requiring a large number of workers and the assistance of heavy machinery, resulting in lengthy erection times.

[0003] The existing methods for erecting emergency repair piers mainly include the derrick method, hydraulic jacking method, and crane hoisting method. The derrick method and crane hoisting method both require manual assembly at high altitudes, which cannot guarantee personnel safety. Although the hydraulic jacking method lifts the pier as a whole, there are many types and quantities of steel components. If the time cycle is too long, a large number of people are needed, and large lifting machinery is required for the erection, which takes a long time. Summary of the Invention

[0004] This invention provides a bridge pier lifting device that can complete the lifting and dismantling of bridge piers in a limited space without the need for large lifting machinery, thus overcoming the limitation that bridge pier bases require a large area of ​​foundation.

[0005] This invention provides a bridge pier lifting device, comprising a lifting frame; a fixing assembly disposed on the lifting frame and connected to two adjacent bridge piers stacked on top of each other, including a first fixing component and a second fixing component, wherein the first fixing component is disposed at the upper end of the lifting frame and connected to the upper bridge pier, and the second fixing component is disposed at the lower end of the lifting frame and connected to the lower bridge pier; a positioning frame disposed inside the lifting frame, one end of which is disposed on the ground and its height is greater than the height of the lifting frame; multiple driving cylinders disposed inside the positioning frame and arranged circumferentially on the positioning frame; and multiple sprocket assemblies corresponding one-to-one with the driving cylinders, including a moving sprocket component, a fixed sprocket component, and a chain component, wherein the moving sprocket component is disposed at the piston end of the driving cylinder, the fixed sprocket component is disposed at the top of the positioning frame, the starting end of the chain component is connected to the fixed sprocket component, the chain component sequentially passes around the moving sprocket component and the fixed sprocket component, and the ending 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, and a first support, the first support being disposed on the positioning frame, and the fixed sprocket being fixed to the first support by the fourth pin.

[0007] In some optional embodiments, the moving sprocket component includes a moving sprocket, a second pin, and a second support, the second support being disposed on the piston, and the moving sprocket being fixed to the second support by the second pin.

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

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

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

[0011] In some optional embodiments, the first fixing component includes a third support, a movable support ear plate, and a spring. The third support is disposed 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 alternative embodiments, the bottom of the pier is provided with a lug plate, and in two stacked piers, the lug plate of the upper pier is connected to the movable support lug plate by a fourth pin.

[0013] In some alternative embodiments, the second fixing component includes a third pin and a locking double ear plate, the locking double ear plate being disposed on the lifting frame, and the third pin connecting the pier and the locking double ear plate.

[0014] In some optional embodiments, the bottom of the pier is provided with a lug plate, and in two stacked piers, the lug plate of the lower pier is connected to the locking double lug plate by the third pin.

[0015] The beneficial effects of this invention are as follows:

[0016] As can be seen from the above scheme, the embodiments of the present invention provide a pier lifting device, which includes a lifting frame, a fixing component, a positioning frame, a drive cylinder, and a sprocket assembly. The fixing component includes a first fixing part and a second fixing part, which are respectively disposed at the upper and lower ends of the lifting frame. The first fixing part and the second fixing part are respectively connected to the pier to be lifted, which can ensure that the lifting frame and the pier are firmly connected and will not interfere during the lifting of the next pier section. The sprocket assembly connects the drive cylinder and the first fixing part. The drive part 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 part, a fixed sprocket part, and a chain part. The moving sprocket part is disposed at the piston end of the drive cylinder, the fixed sprocket part is disposed at the top of the positioning frame, and the starting end of the chain part is connected to the fixed sprocket part. The chain part is sequentially connected to the fixed sprocket part. By bypassing the moving and fixed sprocket components, the end of the chain component connects to the lifting frame. This allows the piston to rise a certain distance, twice the distance the pier lifting piston rod rises. This enables the pier lifting and dismantling work to be completed in a limited space without the need for large lifting machinery, overcoming the limitation of requiring a large foundation area for the pier base. This also greatly increases the length of the pier section. For the same pier height, the number of pier sections can be reduced, reducing the number of assembly steps, improving efficiency, and reducing assembly time. There are multiple drive cylinders located inside the positioning frame, arranged circumferentially around the positioning frame. The sprocket assembly and drive cylinders correspond one-to-one to prevent the lifting frame from being misaligned or squeezed by the guide frame. The positioning frame is located inside the lifting frame, with one end of the positioning frame set to the ground. Its height is greater than that of the lifting frame. The positioning frame supports the fixed sprocket component, lifting it to a certain distance to facilitate the operation of the sprocket assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pier lifting device provided in an embodiment of the present invention in the unlifted state;

[0018] Figure 2 for Figure 1 A schematic diagram of the pier lifting device in the lifting state according to the provided embodiment;

[0019] Figure 3 This is a schematic diagram of the sprocket assembly provided in one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the lifting frame provided in one embodiment of the present invention;

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

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

[0023] Figure 7 This is a schematic diagram showing the connection between the lifting frame and the bridge pier according to one embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the installation structure of the ear plate on the bridge pier according to an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram showing the connection between the ear plate and the first fixing component according to an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram showing the connection between a second ear plate and a second fixing component according to an embodiment of the present invention.

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

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] The number of high-pier, long-span bridges along transportation routes is increasing dramatically, and most of them are important transportation nodes. The probability of entire transportation lines being paralyzed due to bridge damage caused by war or natural disasters is growing. In the future, ensuring comprehensive and rapid mobility is crucial, and the emergency repair and restoration of high-pier, long-span bridges is an unavoidable practical challenge. However, existing equipment, due to structural, weight, and design limitations, struggles to fully and effectively resolve the contradiction between the adaptability of large-span, high-height structures and the timeliness of repairs. When bridges are damaged by natural disasters, leading to the paralysis of entire transportation lines, bridge pier repairs are difficult, requiring a large number of workers and the assistance of heavy machinery, resulting in lengthy erection times.

[0030] The existing methods for erecting emergency repair piers mainly include the derrick method, hydraulic jacking method, and crane hoisting method. The derrick method and crane hoisting method both require manual assembly at high altitudes, which cannot guarantee personnel safety. Although the hydraulic jacking method lifts the pier as a whole, there are many types and quantities of steel components. If the time cycle is too long, a large number of people are needed, and large lifting machinery is required for the erection, which takes a long time.

[0031] This invention provides a bridge pier lifting device that can complete the lifting and dismantling of bridge piers in a limited space without the need for large lifting machinery, thus overcoming the limitation that bridge pier bases require a large area of ​​foundation.

[0032] The following is in conjunction with the instruction manual. Figures 1-10 A detailed explanation of the pier lifting device is provided.

[0033] This application provides a bridge pier lifting device, which includes: a lifting frame 1; a fixing assembly disposed on the lifting frame 1 and connected to two adjacent bridge piers stacked on top of each other, including a first fixing component 21 and a second fixing component 22, wherein the first fixing component 21 is disposed at the upper end of the lifting frame 1 and connected to the upper bridge pier, and the second fixing component 22 is disposed at the lower end of the lifting frame 1 and connected to the lower bridge pier; and a positioning frame 3 disposed inside the lifting frame 1, with one end disposed on the ground and a height greater than that of the lifting frame 1. The height; multiple drive cylinders 4 are located inside the positioning frame 3 and arranged circumferentially in the positioning frame 3; multiple sprocket assemblies 5 are arranged one-to-one with the drive cylinders 4, including a moving sprocket component 51, a fixed sprocket component 52 and a chain component 53. The moving sprocket component 51 is located at the piston end of the drive cylinder 4, the fixed sprocket component 52 is located 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 passes around the moving sprocket component 51 and the fixed sprocket component 52 in sequence, and the ending end of the chain component is connected to the lifting frame 1.

[0034] Specifically, the pier lifting device includes a lifting frame 1, a fixing component, a positioning frame 3, a drive cylinder 4, and a sprocket assembly 5. The fixing component includes a first fixing part 21 and a second fixing part 22, which are respectively located at the upper and lower ends of the lifting frame 1. The first fixing part 21 and the second fixing part 22 are respectively connected to the pier to be lifted, ensuring that the lifting frame 1 is securely connected to the pier and that there is no interference during the lifting of the next pier section. The sprocket assembly 5 connects the drive cylinder 4 and the first support 523. The drive 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 part 51, a fixed sprocket part 52, and a chain part 53. The moving sprocket part 51 is located at the piston end of the drive cylinder 4, the fixed sprocket part 52 is located at the top of the positioning frame 3, and the starting end of the chain part 53 is connected to the fixed sprocket part 52. The chain part 53 is connected sequentially... By bypassing the moving sprocket component 51 and the fixed sprocket component 52, the end of the chain component is connected to the lifting frame 1. This allows the piston to rise a certain distance, twice the distance the pier lifting piston rod rises. This enables the pier lifting and dismantling work to be completed in a limited space without the need for large lifting machinery, overcoming the limitation of the pier base requiring a large foundation area. This also greatly increases the length of the pier section. For the same pier height, the number of pier sections can be reduced, reducing the number of assembly steps, improving efficiency, and reducing assembly time. There are multiple drive cylinders 4, which are located inside the positioning frame 3 and arranged circumferentially. The sprocket assembly 5 and the drive cylinders 4 correspond one-to-one to prevent the lifting frame 1 from being offset and squeezed by the guide frame. The positioning frame 3 is set inside the lifting frame, with one end of the positioning frame 3 set to the ground. Its height is greater than that 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 pier lifting device does not require disassembly; it is embedded in the middle of the pier and does not occupy the pier seat space. When the pier needs to be disassembled, large lifting machinery is no longer required; disassembly can be completed manually in conjunction with the pier. The disassembly process is the reverse of the assembly process. The pier lifting device of this invention has a simple structure, requires fewer workers, has high assembly efficiency, short assembly time, and high safety.

[0036] Furthermore, the guide frame 2 is made of 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 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 by the first pin 522.

[0038] Specifically, the function of the fixed sprocket 521 is to guide the chain 531.

[0039] In some alternative embodiments, the moving sprocket component 51 includes a moving sprocket 511, a second pin 512, and a second support 513. The second support 513 is disposed on the piston 41, and the moving sprocket 511 is fixed to the second support 513 by the second pin 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 the seat for the moving sprocket, and the second support 513 is bolted to the upper end of the piston rod of the drive cylinder 4. The drive cylinder 4 provides power for the movement of the moving sprocket 511. If the lifting is carried out solely by the drive cylinder 4, the piston extension length of the drive cylinder 4 is the same as the lifting height of the pier, which would result in an excessively long cylinder. 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 lifting height is twice the lifting height of the cylinder. Doubling the lifting height within the limited length of the cylinder greatly increases the length of the pier section. For the same pier height, the number of pier sections can be reduced, reducing the number of assembly steps, improving efficiency, and reducing assembly time. In order to stably fix the pier on the lifting mechanism, the existing mechanism locks the pier on the lifting mechanism, which requires manual operation at height, increasing the danger of manual operation.

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

[0042] Specifically, chain 531 meshes with fixed sprocket 521 and moving sprocket 511 respectively.

[0043] Specifically, the third fixing component 532 includes a fifth pin 5321 and a chain fixing plate 5322. 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. The chain connecting transition shaft 5332 is located 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 the adjusting 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 component 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 fixing seat for the support ear plate.

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

[0046] Furthermore, the upper end of the lifting frame 1 supports the ear plate 6 at the bottom of the pier through the movable support ear plate 212. One end of the spring 213 is fixed to the movable support ear plate 212, and the other end of the spring 213 is fixed to the lifting frame 1. The spring 213 provides tension when the movable support ear plate 212 rotates, so that it can be reset. It has the function of being able to quickly and reliably connect or separate from the pier.

[0047] In some alternative embodiments, the pier includes a lug 6, which is connected to a movable support lug 212 via a fourth pin 241.

[0048] Specifically, the bottom of the pier is provided with a lug plate 6. In the two stacked piers, the lug plate 6 of the upper pier is connected to the movable support lug plate 212 via a fourth pin 241, which 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 disposed on the lifting frame 1, the movable support lug plate 212 is rotatably connected to the third support 211, and the spring 213 connects the movable support lug plate 212 and the lifting frame 1. The lug plate 6 and the movable support lug plate 212 are connected via the fourth pin 241.

[0049] In some alternative embodiments, the second fixing component 22 includes a third pin 221 and a locking double ear plate 222, the locking double ear plate 222 being disposed on the lifting frame 1, and the third pin 221 connecting the pier and the locking double ear plate 222.

[0050] Specifically, the second fixing component 22 is used to connect with the bridge pier. The second fixing component 22 is located at the bottom of the lifting frame 1. Optionally, multiple second fixing components 22 are provided, arranged circumferentially around the lifting frame 1. Ear plates 6 are provided at the bottom of the bridge pier. In two stacked bridge piers, the ear plate 6 of the lower bridge pier is connected to the locking double ear plate 222 via a third pin 221. The locking double ear plate 222 is welded to the bottom of the lifting frame 1.

[0051] In some alternative embodiments, the pier also includes a lug plate 6, which is connected to the locking double lug plate 222 via a third pin 221.

[0052] Specifically, the bottom of the pier is provided with ear plates 6. In the two stacked piers, the ear plate 6 of the lower pier is connected to the locking double ear plate 222 by a third pin 221. The bottom of the lifting frame 1 is fixedly connected to the locking double ear plate 222. Optionally, the locking double ear plate 222 is welded to the bottom of the lifting frame 1.

[0053] Optionally, the ear plate 6 on the upper pier is connected to the movable support ear plate 212 via a fourth pin 241, and the ear plate 6 on the lower pier is connected to the locking double ear plate 222 via a third pin 221. This ensures the stability of the pier and eliminates the need for manual climbing to insert or remove the pins. The pier can be fixed and separated by simply inserting or removing the third pin 221 connecting the lower pier to the bottom of the lifting frame 1. This ensures the safety of manual operation, reduces operation time, and improves the lifting efficiency of the mechanism. Furthermore, when lifting again, the movable support ear plate 212 at the upper end of the lifting frame can actively avoid the ear plate 6 and return to its original position to continue the next lifting operation.

[0054] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bridge pier lifting device, characterized in that, include: Improve the framework (1); A fixing component is disposed on the lifting frame (1) and connected to two adjacent bridge piers stacked together. It includes a first fixing component (21) and a second fixing component (22). The first fixing component (21) is disposed at the upper end of the lifting frame (1) and is connected to the bridge pier located above. The second fixing component (22) is disposed at the lower end of the lifting frame (1) and is connected to the bridge pier located below. The positioning frame (3) is set inside the lifting frame (1), with one end set on the ground and its height is greater than the height of the lifting frame (1); A plurality of drive cylinders (4) are located inside the positioning frame (3) and arranged circumferentially in the positioning frame (3); The sprocket assembly (5) has multiple components corresponding one-to-one with the drive cylinder (4), including a moving sprocket component (51), a fixed sprocket component (52), and a chain component (53). The moving sprocket component (51) is located at the piston end of the drive cylinder (4), the fixed sprocket component (52) is located 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) passes around the moving sprocket component (51) and the fixed sprocket component (52) in sequence, and the ending end of the chain component is connected to the lifting frame (1).

2. The pier lifting device according to claim 1, characterized in that, The fixed sprocket component (52) includes a fixed sprocket (521), a first pin (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) by the first pin (522).

3. The pier lifting device according to claim 1, characterized in that, The moving sprocket component (51) includes a moving sprocket (511), a second pin (512), and a second support (513). The second support (513) is disposed on the piston (41), and the moving sprocket (511) is fixed to the second support (513) by the second pin (512).

4. The pier lifting device according to claim 1, characterized in that, The chain component (53) includes 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 disposed 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 pier lifting device according to claim 4, characterized in that, 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).

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

7. The pier lifting device according to claim 1, characterized in that, The first fixing component (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).

8. The pier lifting device according to claim 7, characterized in that, The bottom of the pier is provided with a lug plate (6). In the two stacked piers, the lug plate (6) of the upper pier is connected to the movable support lug plate (212) by a fourth pin (241).

9. The pier lifting device according to claim 1, characterized in that, The second fixing component (22) includes a third pin (221) and a locking double ear plate (222). The locking double ear plate (222) is disposed on the lifting frame (1), and the third pin (221) connects the pier and the locking double ear plate (222).

10. The pier lifting device according to claim 9, characterized in that, The bottom of the pier is provided with a lug plate (6). In the two stacked piers, the lug plate (6) of the lower pier is connected to the locking double lug plate (222) through the third pin (221).

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