A positioning device for hoisting bridge piers

Abstract

This invention provides a positioning device for hoisting bridge piers, belonging to the field of pier construction technology. It includes a foundation and a positioning auxiliary mechanism. A reinforcing cage is installed on top of the foundation, and multiple columns are equidistantly arranged inside the reinforcing cage, centered on the axis of the reinforcing cage. The positioning auxiliary mechanism is installed on top of each column. This positioning device for hoisting bridge piers, by installing columns inside the reinforcing cage and mounting the positioning auxiliary mechanism on the columns, prevents the steel mold from contacting the top of the reinforcing cage during downward hoisting using a top cover. Then, by activating a cylinder, the positioning wheel is brought into contact with the inner wall of the steel mold for positioning and hoisting, thus preventing contact between the steel mold and the reinforcing cage throughout the entire process. The entire process only requires workers to climb onto the reinforcing cage during the installation and disassembly of the positioning auxiliary mechanism; no workers are required to support the steel mold during hoisting, improving the safety of the hoisting process.

Description

Technical Field

[0001] This invention belongs to the field of bridge pier construction technology, specifically relating to a positioning device for hoisting bridge piers. Background Technology

[0002] Formwork construction technology is a common method in bridge construction, mainly consisting of preliminary design, mid-term formwork and support work, and final reinforcement and binding work. The success or failure of formwork construction technology directly affects the structural stability of bridge piers and columns, and also has a certain impact on the smoothness of the pier's appearance. Therefore, the proper application of formwork technology is a crucial link in bridge pier construction. Due to the differences in structural characteristics between southern and northern my country's bridge piers, on-site investigation and in-depth study of the environmental factors of the bridge project are necessary before implementing formwork technology. Topography, geomorphology, and hydrogeology are all subjects of investigation for relevant personnel. Thorough exploration work is essential to ensure the flawless implementation of formwork technology and thus guarantee the quality of the bridge pier's appearance.

[0003] Chinese patent CN221919029U discloses a positioning device for hoisting hollow bridge piers. After the pier enters the positioning device, it contacts a buffer pad. The buffer pad greatly reduces the impact on the pier and prevents it from swaying, facilitating the positioning of the clamping plates. Then, driven by telescopic rods, the clamping plates on both sides clamp and position the pier, aligning it with the pier support. Each clamping frame is equipped with two telescopic rods, which improves the positioning capability of the pier and ensures that the pier moves vertically during its descent. Most existing bridge pier hoisting methods involve hoisting steel molds onto steel reinforcement cages, followed by pouring concrete to form the piers. Since these devices are installed on top of the foundation, they can only be positioned when the bottom of the steel mold is close to the foundation. When the steel mold is hoisted to the outside of the reinforcement cage, it is prone to colliding with the top and side walls of the cage. In reality, workers often need to climb onto the reinforcement cage to support it, which is quite dangerous and makes automatic positioning of the steel mold inconvenient. Summary of the Invention

[0004] To address the unavoidable problem of collisions between steel molds and reinforcing cages during hoisting in existing technologies, this invention provides a positioning device for bridge pier hoisting. This device utilizes a positioning auxiliary mechanism combined with uprights to prevent collisions between the steel molds and the reinforcing cage. The specific technical solution is as follows: A positioning device for bridge pier hoisting includes a foundation and a positioning auxiliary mechanism. A reinforcing cage is mounted on top of the foundation. Multiple uprights are equidistantly arranged inside the reinforcing cage, centered on the axis of the reinforcing cage. The positioning auxiliary mechanism is mounted on top of the uprights. The positioning auxiliary mechanism includes an auxiliary mounting platform, a positioning component, and a top cover. The auxiliary mounting platform is mounted on top of the uprights. The positioning component is mounted on the bottom of the auxiliary mounting platform, and a top cover is mounted on top of the auxiliary mounting platform. The cross-section of the top cover is adapted to the cross-section of the reinforcing cage.

[0005] Preferably, multiple connecting arms are equidistantly installed on the side wall of the auxiliary mounting platform. The number of connecting arms is the same as that of the columns. A base is installed at the bottom of each connecting arm. Each base corresponds to a column. A connecting and fixing component is provided between the base and the column.

[0006] Preferably, the connecting and fixing components include: a screw, a limiting ring, an internal threaded bracket, and a locking nut. The screw is installed on the top of the column, and a limiting ring is fixedly fitted on the outer wall between the column and the screw. An internal threaded bracket is provided on the top of the limiting ring, and the internal threaded bracket is threadedly connected to the screw. The internal threaded bracket is used to support the base. A locking nut is threaded on the surface of the screw, and the locking nut is used to fix the base.

[0007] Preferably, the top of the base has a socket that is compatible with the screw.

[0008] Preferably, the outer wall of the auxiliary mounting platform is provided with a plurality of mounting slots at equal intervals. The number of mounting slots is the same as the number of connecting arms. The mounting slots correspond one-to-one with the connecting arms. The top of the connecting arm is inserted into the mounting slot. The connecting arm is fixedly installed in the mounting slot by fixing pins.

[0009] Preferably, the positioning component includes: a connecting platform, a fixing plate, a connecting box, an inner slide box, a mounting base, and positioning wheels. The connecting platform is installed at the bottom of the auxiliary mounting platform. Multiple fixing plates are installed at equal intervals on the side wall of the connecting platform. A connecting box is fixedly installed on the fixing plate. The number of connecting boxes is the same as the number of connecting arms. The connecting boxes and connecting arms are arranged alternately. An inner slide box is slidably connected inside the connecting box. The end of the inner slide box away from the fixing plate extends out of the connecting box. A mounting base is fixedly installed at the extended end of the inner slide box. A positioning wheel is rotatably connected to the middle of the mounting base.

[0010] Preferably, the auxiliary mounting platform is connected to the connecting platform via a first flange connector, and the auxiliary mounting platform is connected to the top cover via a second flange connector.

[0011] Preferably, a mounting plate is fixedly installed inside the connecting box, and a cylinder is fixedly installed on the mounting plate, with the output end of the cylinder connected to the inner sliding box.

[0012] Preferably, the cylinder is provided with an exhaust pipe connector and an intake pipe connector, and the connecting box is equipped with a partition connector.

[0013] In addition, the positioning device for hoisting bridge piers in the above-mentioned technical solution provided by the present invention may also have the following features: a limit block is fixedly installed on the inner wall of the connecting box, and a slider is fixedly installed on the outer wall of the inner sliding box.

[0014] In the above technical solution, the slider slides against the inner wall of the connecting box.

[0015] The positioning device for hoisting bridge piers of the present invention has the following advantages compared with the prior art: 1. The positioning device for hoisting bridge piers uses a column installed inside the reinforcing cage. The positioning auxiliary mechanism is mounted on the column, and the top cover prevents the steel mold from contacting the top of the reinforcing cage during downward hoisting. Then, by activating the cylinder, the positioning wheel is brought into contact with the inner wall of the steel mold for positioning and hoisting. This process avoids contact between the steel mold and the reinforcing cage throughout. The only time workers need to work on the reinforcing cage is when installing and disassembling the positioning auxiliary mechanism. During the hoisting process, no workers are required to support the steel mold, thus improving the safety of the hoisting process. 2. The positioning device for the bridge pier hoisting uses an internal threaded bracket placed on the screw to support the base. Then, the base is pressed onto the internal threaded bracket by locking the nut. This ensures that the positioning auxiliary mechanism has a certain stability during the positioning process and avoids inaccurate positioning of the steel mold due to unstable installation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the reinforcing cage and positioning auxiliary mechanism provided by the present invention; Figure 2 A schematic diagram of the structure of the auxiliary mounting platform provided by the present invention; Figure 3 This is a schematic diagram of the positioning component provided by the present invention; Figure 4 This is an exploded structural diagram of the connecting and fixing component provided by the present invention; Figure 5A cross-sectional schematic diagram of the connecting box provided by the present invention; in, Figures 1 to 5 The reference numerals and component names in the attached drawings are as follows: 1. Foundation, 2. Reinforcing cage, 3. Column, 4. Auxiliary mounting platform, 5. Positioning component, 6. Top cover, 7. Connecting arm, 8. Connecting and fixing component, 9. First flange connector, 10. Second flange connector, 11. Base, 12. Insertion hole, 13. Mounting connecting plate, 14. Cylinder, 15. Limiting block, 16. Sliding block, 17. Exhaust pipe connector, 18. Intake pipe connector, 19. Partition plate connector, 31. Screw, 32. Limiting ring, 33. Internal threaded bracket, 34. Locking nut, 41. Mounting groove, 42. Fixing pin, 51. Connecting platform, 52. Fixing plate, 53. Connecting box, 54. Inner sliding box, 55. Mounting seat, 56. Positioning wheel. Detailed Implementation

[0017] The following are specific implementation cases and appendices. Figures 1-5 The present invention will be further described, but the present invention is not limited to these embodiments. The present invention provides a technical solution: a positioning device for hoisting bridge piers, comprising: a foundation 1 and a positioning auxiliary mechanism. A steel cage 2 is provided on the top of the foundation 1, and the steel cage 2 is welded to the foundation steel bars on the top of the foundation 1. Four columns 3 are equidistantly arranged inside the steel cage 2. The bottom of the columns 3 is fixed to the foundation 1 by bolts. An anti-tilting support rod is provided between the columns 3 and the foundation 1 to prevent the columns 3 from shaking. The top of the columns 3 extends past the top of the steel cage 2. The four columns 3 are arranged around the axis of the steel cage 2. The positioning auxiliary mechanism is installed on the top of the four columns 3. The positioning auxiliary mechanism includes: an auxiliary mounting platform 4, a positioning component 5, and a top cover 6. The auxiliary mounting platform 4 is installed on the top of the four columns 3, the positioning component 5 is installed on the bottom of the auxiliary mounting platform 4, and the top cover 6 is installed on the top of the auxiliary mounting platform 4. The top surface of the top cover 6 is an arc-shaped structure, and the cross-section of the top cover 6 is not less than the cross-section of the steel cage 2. When the steel mold is hoisted and lowered, the steel mold will first contact the top cover 6, and automatically slide downward due to the arc-shaped structure of the top cover 6, thereby placing the steel mold on the outside of the steel cage 2.

[0018] As a preferred option, four connecting arms 7 are equidistantly installed on the side wall of the auxiliary mounting platform 4. The number of connecting arms 7 is the same as that of the columns 3. A base 11 is welded to the bottom of the connecting arm 7. The base 11 corresponds to the column 3 one by one. A connecting and fixing component 8 is provided between the base 11 and the column 3.

[0019] As a preferred embodiment, the connecting and fixing component 8 further includes: a screw 31, a limiting ring 32, an internal threaded bracket 33, and a locking nut 34. The screw 31 is welded to the top of the column 3, and the limiting ring 32 is welded to the outer wall of the column 3. The top surface of the limiting ring 32 is flush with the top surface of the column 3. An internal threaded bracket 33 is provided on the top of the limiting ring 32, and the internal threaded bracket 33 is threadedly connected to the screw 31. When installing the internal threaded bracket 33, the internal threaded bracket 33 is decoupled from the screw 31. The top of screw 31 is rotated and screwed in until the internal threaded bracket 33 is fitted and supported against the limiting ring 32; the internal threaded bracket 33 is used to support the base 11; a locking nut 34 is installed on the surface thread of screw 31, and the locking nut 34 is also rotated and screwed in from the top of screw 31. The locking nut 34 is used to fix the base 11 and presses the base 11 onto the internal threaded bracket 33; during installation, install from top to bottom in the order of internal threaded bracket 33, base 11 and locking nut 34.

[0020] As a preferred option, the base 11 has a socket 12 on its top, which is adapted to the screw 31, and the cross-sectional size of the socket 12 is not less than the cross-sectional size of the screw 31.

[0021] As a preferred option, further, four mounting slots 41 are equidistantly provided on the outer wall of the auxiliary mounting platform 4. The number of mounting slots 41 is the same as that of the connecting arms 7. The mounting slots 41 correspond one-to-one with the connecting arms 7. The top of the connecting arm 7 is inserted into the mounting slot 41. The connecting arm 7 is fixedly installed in the mounting slot 41 by fixing pins 42. The top of the connecting arm 7 has a mounting hole adapted to the fixing pins 42. The fixing pins 42 pass through the mounting hole to fix the connecting arm 7.

[0022] As a preferred embodiment, the positioning component 5 further includes: a connecting platform 51, a fixing plate 52, a connecting box 53, an inner sliding box 54, a mounting base 55, and positioning wheels 56. The connecting platform 51 is mounted on the bottom of the auxiliary mounting platform 4. Four fixing plates 52 are equidistantly mounted on the side wall of the connecting platform 51. The fixing plates 52 are mounted on the connecting platform 51 by screws. The connecting boxes 53 are fixedly mounted on the fixing plates 52. The connecting boxes 53 have a hollow internal structure. The number of connecting boxes 53 is the same as the number of connecting arms 7. The connecting box 53 is staggered with the connecting arm 7, and each connecting box 53 passes between two connecting arms 7; an inner sliding box 54 is slidably connected inside the connecting box 53. Both the connecting box 53 and the inner sliding box 54 are square structures. The inner sliding box 54 has a hollow structure inside. The end of the inner sliding box 54 away from the fixed plate 52 extends out of the connecting box 53. A mounting base 55 is fixedly installed at the extended end of the inner sliding box 54. A positioning wheel 56 is rotatably connected to the middle of the mounting base 55 through a connecting shaft. The positioning wheel 56 is arranged along the hoisting direction of the steel mold.

[0023] As a preferred embodiment, the auxiliary mounting platform 4 and the connecting platform 51 are further connected by a first flange connector 9, which is bolted to the auxiliary mounting platform 4 and the connecting platform 51. The auxiliary mounting platform 4 and the top cover 6 are connected by a second flange connector 10, which is also bolted to the auxiliary mounting platform 4 and the top cover 6.

[0024] As a preferred option, a mounting plate 13 is fixedly installed inside the connecting box 53. The mounting plate 13 is located near the tail end of the connecting box 53, and a pipe hole is opened on the surface of the mounting plate 13. A cylinder 14 is fixedly installed on the mounting plate 13. The output end of the cylinder 14 is fixedly connected to the inner wall of the inner sliding box 54 on the side away from the connecting platform 51. The inner sliding box 54 covers the outside of the cylinder 14. The position of the cylinder is monitored by a magnetostrictive displacement sensor or a photoelectric encoder. The air intake is adjusted by a PID control algorithm so that the four cylinders 14 reach the target position synchronously. A turbine flow sensor or a differential transformer speed sensor is used to detect the speed deviation. The air intake speed is adjusted by a control algorithm to ensure that the speed is consistent. The four cylinders 14 extend and retract at the same speed. Therefore, when the four positioning wheels 56 are in contact with the inner wall of the steel mold, the axis of the steel mold coincides with the axis of the reinforcing cage 2, thus completing the positioning and hoisting of the steel mold.

[0025] As a preferred embodiment, the cylinder 14 is further equipped with an exhaust pipe connector 17 and an intake pipe connector 18, and the connecting box 53 is equipped with a partition connector 19. The connecting platform 51 is equipped with a power supply and a solenoid valve. The solenoid valve is a two-position three-way solenoid valve, which has an intake port and an outlet port. The outlet port is connected to the cylinder intake port, and the intake port performs both intake and exhaust functions. When the solenoid valve is energized, air enters through the intake port and the cylinder 14 extends. When the solenoid valve is de-energized, air exits through the intake port and the cylinder 14 retracts. The power supply controls the intake and exhaust of the solenoid valve by controlling the on and off of the electromagnet to achieve valve state switching. The power supply is a DC power supply, and the switch is controlled by an external control system. A pipe is connected between the solenoid valve and the outer end of the partition connector 19, and the inner end of the partition connector 19 is connected to the exhaust pipe connector 17 and the intake pipe connector 18 through the pipe.

[0026] As a preferred embodiment, a limiting block 15 is fixedly installed on the inner wall of the connecting box 53. The limiting block 15 is located on the inner wall near the opening of the connecting box 53. A slider 16 is fixedly installed on the outer wall of the inner slide box 54. The slider 16 is located between the limiting block 15 and the mounting connecting plate 13. The slider 16 slides against the inner wall of the connecting box 53. The limiting block 15 is used to limit the movement distance of the inner slide box 54.

[0027] The foundation, reinforcing cage, first flange connector, second flange connector, and cylinder in this case are existing technologies. As long as the foundation, reinforcing cage, first flange connector, second flange connector, and cylinder meet the requirements of this case, they are all acceptable and not limited to a single model.

[0028] The specific types or circuit structures of the controllers for the electrical components mentioned in this application, as well as the circuit connection relationships between the electrical components and the accurate coordinated control of multiple power components, are all prior art. Therefore, the above content will not be elaborated upon in this application.

[0029] Working principle: The electrical components mentioned in this application are all connected to an external power supply and control switch during use. After the invention is installed, first check the installation, fixation and safety protection of the invention, and then it can be used. During use, the steel cage 2 is hoisted onto the foundation 1, the steel cage 2 is welded to the foundation steel bars on the foundation 1, and then four columns 3 are installed inside the steel cage 2, so that the four columns 3 are arranged in a square with the center of the steel cage 2 as the center.

[0030] Then, a layer of release agent is brushed onto the inside of the steel mold, and the steel mold is assembled into a complete cylinder. After assembly, it is set aside for later use. Then, the workers go up to the top of the rebar cage 2 and install the positioning auxiliary mechanism on the column 3. The installation process is as follows: First, the workers rotate the internal thread bracket 33 onto the screw 31, so that the bottom of the internal thread bracket 33 fits against the limiting ring 32. Then, the insertion holes 12 on the four bases 11 are inserted into the corresponding screws 31, so that the bases 11 rest on the internal thread bracket 33 and are supported by the internal thread bracket 33. Then, the locking nut 34 is tightened to fix the bases 11 onto the screws 31. Then, the workers use a crane to lift the steel mold from top to bottom onto the rebar cage 2. During the lifting process, the steel mold should first contact the top cover 6, avoiding... The steel mold can directly contact the rebar cage 2 without the need for a steel mold, and the steel mold can be directly placed on the outside of the rebar cage 2. Finally, when the steel mold is placed on the outside of the rebar cage 2, the cylinder 14 is activated, causing the cylinder 14 to drive the inner sliding box 54 to move outward synchronously. When the cylinder 14 is activated, a magnetostrictive displacement sensor or photoelectric encoder is used to monitor the cylinder position, and the air intake is adjusted through a PID control algorithm to ensure that the four cylinders 14 reach the target position synchronously. A turbine flow sensor or differential transformer speed sensor is used to detect speed deviation, and the air intake speed is adjusted through a control algorithm to ensure consistent speed. The positioning wheel 56 is then in contact with the inner wall of the steel mold. When all four positioning wheels 56 are in contact with the inner wall of the steel mold, they stop. At this time, the steel mold is evenly placed on the outside of the rebar cage 2, thus positioning the steel mold during the hoisting process.

[0031] After the steel mold is positioned and installed, it is secured with wind cables to prevent accidents. Finally, concrete is poured into the mold through a conduit, and the workers inside use vibrators to compact the concrete, ensuring that the concrete is dense and free of honeycomb. After the mold is removed, the bridge pier is sprayed with water for curing to prevent cracking.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention; therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention; no reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] In the description of this invention, the term "a plurality of" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0034] In the description of this invention, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this invention, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A positioning device for hoisting bridge piers, comprising: The foundation (1) and the positioning auxiliary mechanism are characterized in that a steel cage (2) is provided on the top of the foundation (1), and multiple columns (3) are equidistantly arranged inside the steel cage (2), the multiple columns (3) are arranged with the axis of the steel cage (2) as the center, and the positioning auxiliary mechanism is installed on the top of the multiple columns (3). The positioning auxiliary mechanism includes: an auxiliary mounting platform (4), a positioning component (5), and a top cover (6). The top of the multiple columns (3) is provided with an auxiliary mounting platform (4), the bottom of the auxiliary mounting platform (4) is provided with a positioning component (5), and the top of the auxiliary mounting platform (4) is provided with a top cover (6). The top surface of the top cover (6) is an arc surface structure, and the cross-section of the top cover (6) is adapted to the cross-section of the steel cage (2).

2. The positioning device for hoisting bridge piers according to claim 1, characterized in that, Multiple connecting arms (7) are equidistantly installed on the side wall of the auxiliary mounting platform (4). The number of connecting arms (7) is the same as that of the column (3). A base (11) is installed at the bottom of the connecting arm (7). The base (11) corresponds to the column (3) one by one. A connecting and fixing component (8) is provided between the base (11) and the column (3).

3. The positioning device for hoisting bridge piers according to claim 2, characterized in that, The connecting and fixing component (8) includes: a screw (31), a limiting ring (32), an internal thread support (33), and a locking nut (34). The screw (31) is installed on the top of the column (3). The limiting ring (32) is fixedly fitted on the outer wall between the column (3) and the screw (31). The internal thread support (33) is provided on the top of the limiting ring (32). The internal thread support (33) is threadedly connected to the screw (31). The internal thread support (33) is used to support the base (11). The locking nut (34) is installed on the surface thread of the screw (31). The locking nut (34) is used to fix the base (11).

4. The positioning device for hoisting bridge piers according to claim 3, characterized in that, The top of the base (11) has an insertion hole (12) that is compatible with the screw (31).

5. The positioning device for hoisting bridge piers according to claim 2, characterized in that, The auxiliary mounting platform (4) has multiple mounting slots (41) evenly spaced on its outer wall. The number of mounting slots (41) is the same as that of the connecting arms (7). The mounting slots (41) correspond one-to-one with the connecting arms (7). The top of the connecting arm (7) is inserted into the mounting slot (41). The connecting arm (7) is fixedly installed in the mounting slot (41) by fixing pins (42).

6. The positioning device for hoisting bridge piers according to claim 5, characterized in that, The positioning component (5) includes: a connecting platform (51), a fixing plate (52), a connecting box (53), an inner slide box (54), a mounting base (55), and a positioning wheel (56). The bottom of the auxiliary mounting platform (4) is equipped with a connecting platform (51). Multiple fixing plates (52) are equidistantly installed on the side wall of the connecting platform (51). A connecting box (53) is fixedly installed on the fixing plate (52). The number of connecting boxes (53) is the same as that of the connecting arms (7). The connecting boxes (53) and the connecting arms (7) are arranged alternately. An inner slide box (54) is slidably connected inside the connecting box (53). One end of the inner slide box (54) away from the fixing plate (52) extends out of the connecting box (53). A mounting base (55) is fixedly installed at the extended end of the inner slide box (54). A positioning wheel (56) is rotatably connected to the middle of the mounting base (55).

7. The positioning device for hoisting bridge piers according to claim 6, characterized in that, The auxiliary mounting platform (4) is connected to the connecting platform (51) via a first flange connector (9), and the auxiliary mounting platform (4) is connected to the top cover (6) via a second flange connector (10).

8. The positioning device for hoisting bridge piers according to claim 6, characterized in that, An installation connecting plate (13) is fixedly installed inside the connecting box (53), and a cylinder (14) is fixedly installed on the installation connecting plate (13). The output end of the cylinder (14) is connected to the inner sliding box (54).

9. The positioning device for hoisting bridge piers according to claim 8, characterized in that, The cylinder (14) is provided with an exhaust pipe connector (17) and an intake pipe connector (18), and the connecting box (53) is provided with a partition connector (19).

10. The positioning device for hoisting bridge piers according to claim 8, characterized in that, A limiting block (15) is fixedly installed on the inner wall of the connecting box (53), and a slider (16) is fixedly installed on the outer wall of the inner sliding box (54). The slider (16) slides and fits against the inner wall of the connecting box (53).

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