Assembly type bridge pier column construction ladder cage

Abstract

The invention discloses a fabricated bridge pier column construction ladder cage, and belongs to the technical field of bridge construction equipment. The construction platform structurally comprises four groups of rectangular stand columns, assembling plates are circumferentially arranged outside the stand columns, the left sides and the right sides of the stand columns are connected with inclined supporting frames through bolts, a bottom flange is detachably connected with a left front stand column internally provided with a hollow structure, and a motor driving lead screw and a guide rod linkage sleeve block are arranged in the bottom flange to drive the construction platform to vertically ascend and descend. Expanding inserting plates are inserted into the two sides of the construction platform, width adjustment is achieved through limiting bolts and spring mechanisms, anti-skid rubber pads are laid on the surface of the platform, and reinforcing beams are arranged at the bottom. According to the assembly type bridge pier column construction ladder cage, the stand columns are connected with the inclined supporting frames through bolts, the construction ladder cage can be integrally hoisted to the designated position of a pier column, and the construction ladder cage can be reused after being dismantled; and a motor drives a lead screw to achieve lifting of the construction platform, and the manual climbing risk is avoided.

Description

Technical Field

[0001] The present invention relates to the field of application of ladder cages, and more particularly to a prefabricated bridge pier construction ladder cage. Background Art

[0002] During the construction of bridge piers, an aerial work platform is an essential piece of equipment. In traditional construction, a temporary work platform is mostly erected using steel pipe scaffolds, which has problems such as a long erection period, large material losses, and low safety. In recent years, with the development of prefabricated building technology, modular construction equipment has gradually been applied to the field of bridge construction. However, the special ladder cages for pier construction still have defects such as poor adaptability and insufficient stability. Most of the common ladder cage structures on the current market are designed with fixed dimensions, unable to be flexibly adjusted according to the on-site working conditions, and lacking effective safety protection measures, resulting in low construction efficiency and prominent safety hazards.

[0003] Three main types of work platforms are commonly used in bridge pier construction: one is the traditional steel pipe and coupler scaffold, which is erected by vertical poles, horizontal bars, and diagonal braces. Its advantage is the strong universality of materials, and its disadvantage is the time-consuming erection and the stability depending on the technical level of workers; the second is the integral steel operation platform, which is welded from prefabricated steel structures. Its advantage is high rigidity, and its disadvantage is difficult transportation and inability to adapt to different pier sizes; the third is a simple climbing ladder combined with an independent work platform. Its advantage is low cost, and its disadvantages are lack of overall protection, difficult movement, and poor safety, unable to meet the working requirements of ladder cage applications. Therefore, a prefabricated bridge pier construction ladder cage is proposed. Summary of the Invention

[0004] The present invention provides the following technical solution: A prefabricated bridge pier construction ladder cage, comprising: Columns, the number of the columns is 4 groups, the columns are all arranged in a rectangular shape, assembly plates are installed on the outer circumferences of the columns, and diagonal support frames are connected to the left and right sides of the outer parts of the columns by bolts; Folding wire frames, installed at positions between the assembly plates on the outer parts of the columns, bottom flanges are installed at the bottoms of the columns, the bottom of the left front column is a hollow structure, a reinforcing column is connected to the outer circumference of the bottom of the left front column, and a motor is inserted at the bottom end of the left front column; Chutes, opened inside the columns, the top end of the rotor of the motor is coaxially connected to a lead screw, guide rods are inserted into the inner cavities of the right and left rear columns, sleeve blocks are sleeved on the outer parts of the guide rods and the lead screw, and construction platforms are connected to the inner sides of the sleeve blocks; Expansion insertion plates, inserted into the inner sides of both sides of the construction platform, sockets are installed at the bottom left of the construction platform and the bottom right of the expansion insertion plate, and assembly blocks are installed at the bottom left of the expansion insertion plate and the bottom right of the construction platform; The limit pin is inserted into the interior of the assembly block, and a dial block is connected to the bottom of each limit pin.

[0005] Preferably, a top guardrail is installed at the top of the column, the corners of the top guardrail are rounded, and an anti-slip sleeve is sleeved outside the top guardrail.

[0006] Preferably, steel wires are connected to the left and right sides of the top of the column through rings, and the bottom ends of the steel wires are connected to the corresponding positions at the top of the diagonal support frame.

[0007] Preferably, through holes are provided in the bottom of the diagonal support frame and the interior of the bottom flange, and internal support rods are welded on the inner sides of the diagonal support frames.

[0008] Preferably, hinges are installed in the middle of the folding wire frames, and protective nets are inserted into the interiors of the folding wire frames.

[0009] Preferably, rubber pads are laid on the upper surfaces of the construction platform and the extension plugboard, and anti-slip grooves are provided on the surfaces of the rubber pads.

[0010] Preferably, jacks are provided in the interior of the socket, and the external corners of the limit pins are rounded.

[0011] Preferably, through grooves are provided at the positions corresponding to the dial blocks at the bottom of the assembly block, and springs are connected to both sides of the inner ends of the limit pins.

[0012] Preferably, the inner ends of the springs are connected to the corresponding positions on the inner walls of the assembly block, and the lengths of the through grooves are six times the lengths of the dial blocks.

[0013] Preferably, square grooves are provided on the inner sides of the construction platform, and strengthening cross beams are laid horizontally at the bottom of the construction platform.

[0014] In summary, compared with the prior art, the present invention provides an assembled bridge pier construction ladder cage, which has the following beneficial effects: 1. In the present invention, the assembly plates are connected to the columns by bolts, and then the columns and the foundation are strengthened by using diagonal support frames to complete the installation of the ladder cage. This assembled ladder cage can be assembled in advance according to the on-site requirements, and then directly lifted to the designated location by a crane. At the same time, after the construction is completed, the fixing device can be completely removed, and then the whole can be lifted by the crane to the next designated location for continued use, avoiding the need for repeated construction each time during movement and facilitating rapid transportation; 2. The present invention drives the rotation of the lead screw through a motor, so that the up and down movement of the construction platform can be driven by the sleeve block, realizing the rapid change of the height position of the construction platform in an electric manner, thus avoiding the need for construction workers to climb when changing the height. The electric lifting platform can quickly deliver the construction workers to the designated height, improving the transfer efficiency of the construction workers between different working surfaces, and then accelerating the overall construction progress. Moreover, when moving on the climbing ladder, the construction workers need to rely on their own balance ability and physical strength to maintain stability. Especially when carrying tools or materials, it is easier to have a falling accident. However, driving the lifting of the construction platform in an electric manner can effectively prevent the construction workers from falling during the lifting process, ensuring the life safety of the construction workers. At the same time, since the surface of the construction platform can bear a certain weight of equipment and materials, it can be transported to the designated height by motor drive, avoiding problems such as the dropping and damage of equipment and materials that may occur during manual handling. At the same time, it also improves the transportation efficiency, providing guarantee for the smooth progress of the construction and enhancing the practicability of the ladder cage. 3. The present invention pushes the dial block to drive the retraction of the limit pin, so that the expansion plug board can be inserted between the construction platforms. Then, when the dial block is released, the limit pin can be inserted into the inside of the socket, completing the installation of the expansion plug board. Furthermore, the width of the construction platform can be changed, enabling adjustment according to the diameter of the beam pier column during the actual construction process, thus enhancing the adaptability of the ladder cage. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the bottom of the column of the present invention.

[0017] Figure 3 It is a schematic structural diagram of the lead screw of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the sleeve block of the present invention.

[0019] Figure 5 It is a schematic structural diagram of the folding net frame of the present invention.

[0020] Figure 6 It is a schematic structural diagram of the bottom of the construction platform and the expansion plug board of the present invention.

[0021] Figure 7 It is an assembly schematic diagram of the socket assembly block structure of the present invention.

[0022] Figure 8 It is a schematic cross-sectional structure diagram of the assembly block of the present invention.

[0023] Description of the Reference Numerals: 1. Column; 2. Assembly plate; 3. Diagonal support frame; 4. Folding mesh frame; 5. Bottom flange; 6. Reinforcing column; 7. Motor; 8. Chute; 9. Lead screw; 10. Guide rod; 11. Sleeve block; 12. Construction platform; 13. Protection net; 14. Hinge; 15. Extension plugboard; 16. Socket; 17. Assembly block; 18. Top guardrail; 19. Steel wire rope; 20. Inner support rod; 21. Jack; 22. Limit pin; 23. Through slot; 24. Pusher block; 25. Spring. Detailed implementation manner

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] The present invention provides a technical solution, an assembled bridge pier construction ladder cage, including a column 1, an assembly plate 2, a diagonal support frame 3, a folding mesh frame 4, a bottom flange 5, a reinforcing column 6, a motor 7, a chute 8, a lead screw 9, a guide rod 10, a sleeve block 11, a construction platform 12, a protection net 13, a hinge 14, an extension plugboard 15, a socket 16, an assembly block 17, a top guardrail 18, a steel wire rope 19, an inner support rod 20, a jack 21, a limit pin 22, a through slot 23, a pusher block 24 and a spring 25: Please refer to Figure 1 , the number of columns 1 is 4 groups, the columns 1 are all rectangularly arranged, an assembly plate 2 is installed on the outer circumference of the column 1, diagonal support frames 3 are bolted to the left and right sides of the outer part of the column 1, a top guardrail 18 is installed at the top of the column 1, the corners of the top guardrail 18 are all rounded, an anti-slip sleeve is sleeved on the outer part of the top guardrail 18, steel wire ropes 19 are connected to the left and right sides of the top of the column 1 through rings, the bottom ends of the steel wire ropes 19 are respectively connected to the corresponding positions at the top of the diagonal support frames 3, through holes are respectively opened in the bottom of the diagonal support frames 3 and the inside of the bottom flange 5, and inner support rods 20 are welded on the inner sides of the diagonal support frames 3; The folding mesh frame 4 is installed at the position between the assembly plates 2 on the outer part of the column 1. Please refer to Figure 2, a bottom flange 5 is installed at the bottom end of the vertical column 1. The bottom flange 5 serves as a connecting component between the vertical column 1 and the foundation or other support structures, and it can evenly transfer the load borne by the vertical column 1 to the foundation. The bottom flange 5 has a relatively large area, which can disperse the pressure and reduce the situation of excessive local stress on the foundation, ensuring the stable standing of the cage on the foundation. The bottom of the left front vertical column 1 is a hollow structure, and a reinforcing column 6 is connected to the outer periphery of the bottom of the left front vertical column 1. The connection of the reinforcing column 6 makes up for the possible insufficient strength caused by the hollow structure at the bottom of the left front vertical column 1. The reinforcing column 6 can enhance the structural strength of the bottom of the left front vertical column 1, making it as stable and reliable as other vertical columns when bearing the load, and ensuring the integrity and stability of the entire cage structure. The bottom end of the left front vertical column 1 is inserted with a motor 7. Please refer to Figure 5 , hinges 14 are installed in the middle of the folding wire frames 4, and protective nets 13 are inserted inside the folding wire frames 4; Please refer to Figure 3 , a chute 8 is opened inside the vertical column 1. The top end of the rotor of the motor 7 is coaxially connected with a lead screw 9. Please refer to Figure 4 , guide rods 10 are inserted into the inner cavities of the right and left rear vertical columns 1. Sleeve blocks 11 are sleeved on the outer parts of the guide rods 10 and the lead screw 9. Construction platforms 12 are connected to the inner sides of the sleeve blocks 11. Square grooves are opened on the inner sides of the construction platforms 12, and reinforcing cross beams are horizontally laid at the bottoms of the construction platforms 12; Please refer to Figure 6 and Figure 7 , extension inserts 15 are inserted into both sides inside the construction platforms 12. Sockets 16 are installed at the bottom left of the construction platforms 12 and the bottom right of the extension inserts 15. Assembly blocks 17 are installed at the bottom left of the extension inserts 15 and the bottom right of the construction platforms 12. Rubber pads are laid on the upper surfaces of the construction platforms 12 and the extension inserts 15, and anti-slip grooves are opened on the surfaces of the rubber pads. The laying of the rubber pads provides a comfortable standing and walking surface for construction workers. The rubber pads have a certain elasticity, which can reduce the fatigue of construction workers when standing or walking on the platform for a long time. At the same time, the rubber pads can also play a certain shock-absorbing role. When the construction platform 12 has a slight vibration (such as when the motor 7 starts or stops), it can reduce the impact on construction workers). Anti-slip grooves are opened on the surfaces of the rubber pads (the existence of the anti-slip grooves increases the friction on the surface of the rubber pads, preventing construction workers from slipping when walking on the construction platforms 12 and the extension inserts 15. During the construction process, construction workers may carry equipment or materials on the platform, and the anti-slip grooves can ensure the stability of the footsteps of construction workers and improve the safety during the construction process; The limit pin 22 is inserted into the interior of the assembly block 17. At the bottom of the limit pin 22, a dial block 24 is connected. In the interior of the socket 16, jacks 21 are provided. At the outer corners of the limit pin 22, rounded corners are provided. At the positions on the bottom of the assembly block 17 corresponding to the dial block 24, through slots 23 are provided. Please refer to Figure 8 , on both sides of the inner end of the limit pin 22, springs 25 are connected. The inner ends of the springs 25 are connected to the corresponding positions on the inner wall of the assembly block 17. The length of each through slot 23 is six times the length of the dial block 24. The limit pin 22 plays a role in restricting and fixing the extension plugboard 15 inside the assembly block 17. When the extension plugboard 15 is inserted into the construction platform 12, the limit pin 22 can prevent the extension plugboard 15 from accidentally detaching from the construction platform 12 during use, ensuring the stability of the construction platform 12 after the width adjustment. The dial block 24 provides a convenient way to operate the limit pin 22. Construction workers can control the telescoping of the limit pin 22 by pushing the dial block 24. This design is simple and intuitive, facilitating the operation of construction workers when they need to adjust the width of the construction platform 12.

[0026] In this solution, the assembly plate 2 is connected to the column 1 by bolts, and then the column 1 and the foundation are reinforced by the diagonal support frame 3 to complete the installation of the ladder cage. This assembled ladder cage can be assembled into the required size according to the on-site requirements first, and then directly lifted to the designated location by a crane. At the same time, after the construction is completed, the fixing device can be completely removed, and then the whole can be lifted by the crane to the next designated location for continued use, avoiding the need for repeated erection each time during movement and facilitating rapid transportation.

[0027] In this solution, the motor 7 drives the rotation of the lead screw 9, so that the lifting and lowering of the construction platform 12 can be driven by the sleeve block 11, realizing the rapid change of the height position of the construction platform 12 in an electric manner, thus avoiding the need for construction workers to climb when changing the height. The electric lifting platform can quickly deliver construction workers to the designated height, improving the transfer efficiency of construction workers between different working surfaces, and then accelerating the overall construction progress. Moreover, when moving on the climbing ladder, construction workers need to rely on their own balance ability and physical strength to maintain stability. Especially when carrying tools or materials, it is more likely to cause falling accidents. The electric drive for lifting and lowering the construction platform can effectively prevent construction workers from falling during the lifting and lowering process, ensuring the life safety of construction workers. At the same time, since the surface of the construction platform 12 can carry equipment and materials of a certain weight, it can be transported to the designated height by driving the motor 7, avoiding problems such as dropping and damage of equipment and materials that may occur during manual handling, and also improving the transportation efficiency, providing guarantee for the smooth progress of construction and enhancing the practicality of the ladder cage.

[0028] This solution drives the retraction of the limit plug 22 by pushing the driving block 24, so that the expansion plugboard 15 can be inserted between the construction platforms 12. Then, release the driving block 24, and the limit plug 22 can be inserted into the interior of the socket 16, completing the installation of the expansion plugboard 15. Furthermore, the width of the construction platform 12 can be changed, enabling adjustment according to the diameter of the beam pier column during actual construction, improving the adaptability of the ladder cage.

[0029] The installation implementation steps of this application are as follows: Basic preparation: At the construction site, determine the installation position of the ladder cage according to the design requirements. Ensure that the foundation at the installation site is flat and solid enough to bear the weight of the ladder cage and its load. Column assembly: Take out 4 groups of columns 1. Since the columns 1 are all rectangularly arranged, place them in the predetermined layout. Pay attention to the direction and positional relationship of the columns 1 to ensure the accuracy of subsequent installation. Install the assembly plate 2 circumferentially outside the columns 1 and firmly connect the assembly plate 2 to the columns 1 using bolts. This step requires ensuring that the bolts are tightened to guarantee the firm connection between the assembly plate 2 and the columns 1. Connect the diagonal support frames 3 to the left and right sides outside the columns 1 through bolts. Through holes are provided at the bottom of the diagonal support frames 3 and inside the bottom flange 5, which will play an important role in subsequent reinforcement connections. At the same time, an inner support rod 20 is welded inside the diagonal support frames 3, which can enhance the structural strength of the diagonal support frames 3. Connect the bottom outer circumference of the left front column 1 to the strengthening column 6, which can improve the structural strength of the bottom of the left front column 1 because the bottom of the left front column 1 is a hollow structure and is relatively weak. Top and bottom installation: Install the top guardrail 18 at the top of the columns 1. The corners of the top guardrail 18 are all rounded, and an anti-slip sleeve is sleeved outside it, which helps improve the safety of construction workers during top operations. Connect the steel wire ropes 19 to the left and right sides at the top of the columns 1 through rings, and connect the bottom ends of the steel wire ropes 19 to the corresponding positions at the top of the diagonal support frames 3 to further enhance the overall stability of the ladder cage. Install the bottom flange 5 at the bottom of the columns 1, and the bottom flange 5 will be connected to the foundation or other support structures. Folding net frame installation: Install the folding net frame 4 at the position between the assembly plates 2 outside the columns 1. Install the hinge 14 in the middle of the folding net frame 4, and then insert the protective net 13 into the interior of the folding net frame 4. The protective net 13 can prevent construction workers from falling inside the ladder cage. Internal structure installation: Insert the guide rod 10 into the inner cavities of the right and left rear columns 1. Insert the motor 7 into the bottom end of the left front column 1 (since the bottom of the left front column 1 is a hollow structure that can accommodate the motor 7), then coaxially connect the top end of the rotor of the motor 7 to the lead screw 9. Sleeve the sleeve block 11 outside the lead screw 9 and the guide rod 10, and connect the construction platform 12 to the inner side of the sleeve block 11. A square groove is provided inside the construction platform 12, and a reinforcing cross beam is horizontally laid at the bottom, which helps to improve the load-bearing capacity of the construction platform 12. The expansion inserts 15 are inserted on both sides inside the construction platform 12. Sockets 16 are installed on the left bottom of the construction platform 12 and the right bottom of the expansion insert 15, and fitting blocks 17 are installed on the left bottom of the expansion insert 15 and the right bottom of the construction platform 12. And rubber pads are laid on the upper surfaces of the construction platform 12 and the expansion insert 15, and anti-slip grooves are provided on the surfaces of the rubber pads to improve the safety of construction workers walking on the platform. A limit pin 22 is inserted into the fitting block 17, the bottom of the limit pin 22 is connected to a toggle block 24, a jack 21 is provided inside the socket 16, the outer corners of the limit pin 22 are rounded, a through groove 23 is provided at the bottom of the fitting block 17 corresponding to the toggle block 24, both sides of the inner end of the limit pin 22 are connected to springs 25, and the inner ends of the springs 25 are connected to the corresponding positions on the inner wall of the fitting block 17. The length of the through groove 23 is six times the length of the toggle block 24. This structure is used for the connection and disassembly of the expansion insert 15 and the construction platform 12; Overall reinforcement and positioning: Use the diagonal support frame 3 to reinforce between the column 1 and the foundation. The cage can be firmly fixed to the foundation by inserting fixing parts (such as bolts, etc.) into the through holes at the bottom of the diagonal support frame 3 and the bottom flange 5. After determining the size of the cage according to the on-site requirements, use a crane to lift the assembled cage to the designated location for construction; The working method steps of this application are as follows: Height adjustment of the construction platform: When it is necessary to adjust the height of the construction platform 12, start the motor 7. The motor 7 drives the lead screw 9 to rotate. Since the sleeve block 11 is sleeved outside the lead screw 9 and the guide rod 10, the rotation of the lead screw 9 will cause the sleeve block 11 to move up and down along the lead screw 9 (the guide rod 10 plays a guiding role to ensure the linear motion of the sleeve block 11). The up and down movement of the sleeve block 11 will drive the construction platform 12 connected to its inner side to move synchronously, thus realizing the electric adjustment of the height position of the construction platform 12. Construction workers can, according to construction requirements, such as reaching working surfaces at different heights, operate the motor 7 to raise or lower the construction platform 12 to an appropriate height. During the lifting and lowering process of the construction platform 12, due to electric drive, it avoids the physical consumption of construction workers climbing, and at the same time improves the transfer efficiency of construction workers between different working surfaces. Moreover, the electric lifting platform is relatively stable, effectively preventing construction workers from falling during the lifting and lowering process, ensuring the life safety of construction workers. The surface of the construction platform 12 can bear equipment and materials of a certain weight. When it is necessary to transport equipment and materials to a specified height, place them on the construction platform 12 and drive the construction platform 12 to lift and lower through the motor 7, and the equipment and materials can be smoothly transported to the required height, avoiding problems such as dropping and damage of equipment and materials that may occur during manual handling, and improving the transportation efficiency; Width adjustment of the construction platform: When it is necessary to adjust the width of the construction platform 12 according to the diameter of the beam pier column, push the dial block 24. The dial block 24 moves in the through groove 23. Due to the length limitation of the through groove 23, the dial block 24 drives the limit pin 22 to retract (overcoming the elastic force of the spring 25). After the limit pin 22 retracts, insert the expansion plate 15 between the construction platforms 12, align the socket 16 at the bottom of the expansion plate 15 with the assembly block 17 at the bottom of the construction platform 12, then release the dial block 24, and the limit pin 22 is inserted into the jack 21 inside the socket 16 under the action of the elastic force of the spring 25, completing the installation of the expansion plate 15, thereby changing the width of the construction platform 12 to meet the construction requirements of beam pier columns with different diameters.

[0030] The movement method steps of this application are as follows: Lifting and lowering movement of the construction platform: As described in the above working method, the lifting and lowering movement of the construction platform 12 is realized through the transmission mechanism of the motor 7, the lead screw 9 and the sleeve block 11. The forward or reverse rotation of the motor 7 determines the rotation direction of the lead screw 9, and further determines the upward or downward movement of the sleeve block 11 and the construction platform 12. During the entire lifting and lowering movement process, the guide rod 10 ensures the vertical movement track of the construction platform 12 and prevents it from deviating or shaking; Insertion and extraction movements of the extension plugboard: The insertion movement of the extension plugboard 15 is achieved by operating the shifting block 24 to retract the limit pin 22, then inserting the extension plugboard 15 between the construction platforms 12, and finally releasing the shifting block 24 to insert the limit pin 22 into the jack 21 to complete the fixation. When it is necessary to extract the extension plugboard 15, push the shifting block 24 again to retract the limit pin 22, and then extract the extension plugboard 15 from between the construction platforms 12.

[0031] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An assembled bridge pier construction ladder cage, characterized in that, Including: Vertical columns (1), the number of the vertical columns (1) is 4 groups, the vertical columns (1) are all arranged in a rectangular shape, an assembly plate (2) is installed on the outer circumference of the vertical columns (1), and diagonal support frames (3) are connected to the left and right sides of the outer part of the vertical columns (1) by bolts; A folding net frame (4) is installed at a position between the assembly plates (2) on the outer part of the vertical columns (1). A bottom flange (5) is installed at the bottom end of the vertical columns (1). The bottom of the left front vertical column (1) is of a hollow structure. A reinforcing column (6) is connected to the outer circumference of the bottom of the left front vertical column (1). A motor (7) is inserted at the bottom end of the left front vertical column (1); Chutes (8) are opened inside the vertical columns (1). The top end of the rotor of the motor (7) is coaxially connected with a lead screw (9). Guide rods (10) are inserted into the inner cavities of the right and left rear vertical columns (1). Sleeve blocks (11) are sleeved on the outer parts of the guide rods (10) and the lead screw (9). Construction platforms (12) are connected to the inner sides of the sleeve blocks (11); Expansion plug plates (15) are inserted into the two sides inside the construction platforms (12). Sockets (16) are installed at the bottom left of the construction platforms (12) and the bottom right of the expansion plug plates (15). Assembly blocks (17) are installed at the bottom left of the expansion plug plates (15) and the bottom right of the construction platforms (12); Limit pins (22) are inserted into the assembly blocks (17). Blocks (24) are connected to the bottoms of the limit pins (22).

2. The prefabricated bridge pier column construction ladder cage according to claim 1, characterized in that: A top guardrail (18) is installed at the top end of the vertical columns (1). The corners of the top guardrail (18) are all rounded. An anti-slip sleeve is sleeved on the outer part of the top guardrail (18).

3. The prefabricated bridge pier column construction ladder cage according to claim 1, characterized in that: Steel wires (19) are connected to the left and right sides at the top of the vertical columns (1) through rings. The bottom ends of the steel wires (19) are connected to the corresponding positions at the top of the diagonal support frames (3).

4. The construction ladder cage for prefabricated bridge piers according to claim 1, characterized in that: Through holes are opened in the bottoms of the diagonal support frames (3) and the interiors of the bottom flanges (5). Inner support rods (20) are welded on the inner sides of the diagonal support frames (3).

5. The prefabricated bridge pier column construction ladder cage according to claim 1, characterized in that: Hinges (14) are installed in the middle of the folding net frames (4). Protection nets (13) are inserted into the folding net frames (4).

6. The prefabricated bridge pier column construction ladder cage according to claim 1, characterized in that: Rubber pads are laid on the upper surfaces of the construction platforms (12) and the expansion plug plates (15). Anti-slip grooves are opened on the surfaces of the rubber pads.

7. The prefabricated bridge pier column construction ladder cage according to claim 1, characterized in that: Holes (21) are opened in the interiors of the sockets (16). The outer corners of the limit pins (22) are all rounded.

8. The prefabricated bridge pier column construction ladder cage according to claim 1, characterized in that: Through grooves (23) are opened at positions corresponding to the blocks (24) at the bottoms of the assembly blocks (17). Springs (25) are connected to both sides of the inner ends of the limit pins (22).

9. The prefabricated bridge pier column construction ladder cage according to claim 8, characterized in that: The inner ends of the springs (25) are connected to the corresponding positions on the inner walls of the assembly blocks (17). The lengths of the through grooves (23) are six times the lengths of the blocks (24).

10. The prefabricated bridge pier column construction ladder cage according to claim 1, characterized in that: Square grooves are opened on the inner sides of the construction platforms (12). Reinforcing cross beams are horizontally laid at the bottoms of the construction platforms (12).

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