A prefabricated small box girder movable side mold convenient to disassemble

Abstract

The present application belongs to the field of box girder pouring, and particularly relates to a prefabricated small box girder movable side mold convenient to disassemble and assemble, which comprises a bottom mold arranged on the ground, adjusting devices arranged on both sides of the bottom mold on the ground, and a side mold arranged on the adjusting devices through a steel frame. The adjusting device comprises a moving seat arranged on the ground, a first pedestal horizontally slidingly arranged on the moving seat, and a first hydraulic cylinder arranged on the moving seat and connected with the first pedestal at the telescopic end. Second hydraulic cylinders are vertically arranged on the top surface of the first pedestal and connected with the second pedestal at the telescopic end. The steel frame of the side mold is arranged on the top surface of the second pedestal. The side mold and the bottom mold are connected through fastening devices. The fastening devices work when the first hydraulic cylinder pushes the first pedestal to move, and automatically connect the side mold and the bottom mold, thereby saving the time for manually arranging and disassembling the tie rods and effectively improving the work efficiency and practicality.

Description

Technical Field

[0001] This invention belongs to the field of box girder casting, and particularly relates to a movable side formwork for precast small box girders that is easy to assemble and disassemble. Background Technology

[0002] In the production of precast small box girders, mobile side molds are often used to improve production efficiency and automation. These molds are driven by hydraulic cylinders to move horizontally on tracks, enabling rapid opening and closing of the molds. This technology significantly reduces the labor intensity of traditional hoisting or manual mold dismantling.

[0003] After the existing hydraulic system completes the initial positioning and closure of the side molds, workers need to manually insert the tie rods through the pre-drilled holes in the bottom mold and connect them to the back ribs of the side molds on both sides. Then, they manually tighten the nuts at both ends to apply pre-tightening force to reinforce the mold. This ensures the rigidity and accuracy of the template during subsequent long-term vibration and pressure holding processes. However, the large number and dense distribution of tie rods make the manual insertion and tightening of nuts extremely tedious. Furthermore, during demolding, all nuts must be loosened in the opposite direction and the tie rods pulled out, resulting in highly repetitive actions that are time-consuming, labor-intensive, and reduce work efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a movable side formwork for prefabricated small box girders that is easy to assemble and disassemble, so as to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of the present invention for a movable side formwork for prefabricated small box girders that is easy to assemble and disassemble is as follows: A movable side formwork for precast small box girders that is easy to assemble and disassemble includes a bottom formwork on the ground, with adjustment devices on both sides of the bottom formwork. Side formwork is mounted on the adjustment devices via a steel frame. Each adjustment device includes a movable base on the ground, with a first platform sliding horizontally on the movable base. A first hydraulic cylinder is mounted on the movable base, with its extension / retraction end connected to the first platform. Second hydraulic cylinders are vertically distributed on the top surface of the first platform, with their extension / retraction ends connected to the second platform. The steel frame of the side formwork is mounted on the top surface of the second platform. The side formwork and the bottom formwork are connected by a fastening device.

[0006] Furthermore, the fastening device includes an insert rod located on the bottom surface of the side mold, corresponding to a pre-drilled hole in the bottom mold, and a positioning hole is formed on the insert rod. A mounting frame is provided on the side wall of the bottom mold, and a positioning plate is slidably mounted within the mounting frame. A force-bearing plate is provided on the bottom surface of the positioning plate. An electric push rod is located on the side wall of the mounting frame, and the electric push rod cooperates with the force-bearing plate. The top of the positioning plate is set at a right angle for insertion into the positioning hole.

[0007] Furthermore, the first base has a push plate on its side wall near the bottom mold, and the free end of the push plate is beveled. An insertion hole adapted to the push plate is located on the positioning plate. The second base has a limiting pin on its side wall facing the bottom mold, and a fixing block is located on the bottom surface of the steel frame. The limiting pin and the fixing block are slidably connected, and a first spring is fitted onto the limiting pin between the second base and the fixing block. The steel frame and the second base are slidably connected.

[0008] Furthermore, multiple support devices are distributed on the second base, and through holes are opened on the second base corresponding to the positions of each support device. The support device includes a screw rod that is slidably disposed in the through hole, and an adjustment part that is threadedly connected to the screw rod.

[0009] Furthermore, the adjusting part includes a threaded connection to two semi-circular threaded sleeves on the screw rod. The two threaded sleeves combine to form an enclosure around the screw rod, and each threaded sleeve has a horizontal support arm on its outer side. A hollow nut is located outside the two threaded sleeves, with a gap between the inner cavity of the nut and the threaded sleeve. The support arm passes through the nut and the two are slidably disposed, and a second spring is sleeved on the support arm between the inner wall of the threaded sleeve and the nut.

[0010] Furthermore, the free end of the support arm is provided with a pull plate, which extends beyond the nut.

[0011] Furthermore, a baffle is provided on the outer wall of the nut corresponding to the position of the pull plate to limit the pull plate.

[0012] Furthermore, the top surface of the second base is equipped with locking devices corresponding to each screw position to limit their movement. The locking devices include two protrusions fixedly mounted on the top surface of the second base, and a limiting block is rotatably provided between the two protrusions. The free end of the limiting block is a right angle, which is used to limit the movement of the screw.

[0013] Furthermore, the ground is equipped with guide rails, and the bottom of the movable seat is equipped with wheels for moving on the guide rails. The movable seat is equipped with a motor, and the output end of the motor is connected to any of the wheels.

[0014] The movable side mold for prefabricated small box girder, which is easy to assemble and disassemble, has the following advantages: This invention incorporates a fastening device that automatically connects the side mold and the bottom mold when the first hydraulic cylinder moves the first base. This saves time spent manually installing and removing the tie rods, effectively improving work efficiency and enhancing practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a movable side formwork structure for a prefabricated small box girder that is easy to assemble and disassemble according to the present invention; Figure 2 This is a schematic diagram of the second base, limiting pin, first spring, and fixing block of the present invention. Figure 3for Figure 1 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the fastening device structure of the present invention; Figure 5 This is a schematic diagram of the adjustment part of the present invention; Figure 6 for Figure 1 Enlarged view of section B in the middle.

[0016] Explanation of markings in the diagram: 1. Movable base; 2. First hydraulic cylinder; 3. First platform; 4. Second hydraulic cylinder; 5. Second platform; 6. Steel frame; 7. Side mold; 8. Bottom mold; 9. Fixing block; 10. First spring; 11. Limit pin; 12. Insert rod; 13. Positioning hole; 14. Push plate; 15. Mounting frame; 16. Positioning plate; 161. Insertion hole; 17. Electric push rod; 18. Force plate; 19. Reserved hole; 20. Nut; 21. Screw sleeve; 22. Support arm; 23. Second spring; 24. Pull plate; 25. Baffle; 26. Screw; 27. Limiting block; 28. Through hole; 29. ​​Motor. Detailed Implementation

[0017] To better understand the purpose, structure, and function of this invention, the following detailed description of a movable side formwork for prefabricated small box girders that is easy to assemble and disassemble is provided in conjunction with the accompanying drawings.

[0018] like Figures 1 to 6 As shown, a movable side formwork for precast small box girders of the present invention, which is easy to assemble and disassemble, includes a bottom formwork 8 set on the ground, and adjustment devices are provided on both sides of the bottom formwork 8 on the ground. Side formwork 7 is mounted on the adjustment devices via a steel frame 6. The adjustment devices can drive the side formwork 7 on the steel frame 6 to move, thereby completing the mold assembly and disassembly of the side formwork 7 and the bottom formwork 8, and improving the overall mold assembly and disassembly efficiency.

[0019] Specifically, the adjustment device includes a movable base 1 mounted on the ground, with a first platform 3 horizontally sliding on the movable base 1. A first hydraulic cylinder 2 is also mounted on the movable base 1, with its extension end connected to the first platform 3. The first hydraulic cylinder 2 allows the first platform 3 on the sliding base to move horizontally closer to or further away from the bottom mold 8. To adjust the height of the side mold 7, a second hydraulic cylinder 4 is vertically distributed on the top surface of the first platform 3, with its extension end connected to a second platform 5. The steel frame 6 of the side mold 7 is mounted on the top surface of the second platform 5. When the second hydraulic cylinder 4 operates, it drives the steel frame 6 and the side mold 7 to adjust their height via the second platform 5. This cooperation between the first hydraulic cylinder 2 and the second hydraulic cylinder 4 enables lateral and height adjustments of the side mold 7, simplifying the operation process, making operation more convenient, and further improving work efficiency.

[0020] To facilitate the movement of the sliding seat 1, a guide rail is provided on the ground. A traveling wheel is located on the bottom surface of the sliding seat 1 for traveling on the guide rail. A motor 29 is mounted on the sliding seat 1, and the output of the motor 29 is connected to any of the traveling wheels. When the motor 29 is started, its output drives the connected traveling wheel to rotate. The traveling wheel rolls along the guide rail, driving the sliding seat 1 to travel longitudinally along a pre-set track on the ground. This facilitates the rapid movement of the side mold 7 to different prefabrication stations.

[0021] Preferably, the side mold 7 and the bottom mold 8 are connected by a fastening device. This fastening device is designed so that when the first hydraulic cylinder 2 moves the first base 3, the first base 3 operates accordingly, automatically connecting the side mold 7 and the bottom mold 8. This saves time spent manually installing and removing the tie rods, effectively improving work efficiency and enhancing practicality. Specifically, the fastening device includes an insert rod 12 located on the bottom surface of the side mold 7, with a positioning hole 13 on the insert rod 12. The insert rod 12 is located on the lowest surface of the side mold 7, and is L-shaped. The horizontal section of the insert rod 12 corresponds to a pre-drilled hole 19 in the bottom mold 8, meaning the horizontal section of the insert rod 12 can be inserted into the pre-drilled hole 19.

[0022] like Figure 1 , Figure 3 and Figure 4 As shown, the bottom mold 8 has a mounting frame 15 on its side wall, and a positioning plate 16 is slidably mounted inside the mounting frame 15. A force-bearing plate 18 is mounted on the bottom surface of the positioning plate 16. An electric push rod 17 is also mounted on the side wall of the mounting frame 15, and the electric push rod 17 cooperates with the force-bearing plate 18. When the side mold 7 moves laterally to the mold closing position under the drive of the first hydraulic cylinder 2, the insertion rod 12 fixed to the bottom surface of the side mold 7 moves synchronously towards the bottom mold 8 with the side mold 7 and inserts into the reserved hole 19 of the bottom mold 8. After the insertion rod 12 is in place, the electric push rod 17 is activated. The electric push rod 17 pulls the force-bearing plate 18, and the force-bearing plate 18 drives the positioning plate 16 to slide within the mounting frame 15 and insert into the positioning hole 13. The insertion rod 12 is mechanically locked, thus achieving a rigid connection between the side mold 7 and the bottom mold 8. Similarly, when mold disassembly is required, the electric push rod 17 pushes the force-bearing plate 18, causing the positioning plate 16 to exit from the positioning hole 13. Once the insertion rod 12 returns to its free state, the first hydraulic cylinder 2 reverses and drives the side mold 7 to move outward, and the insertion rod 12 is pulled out from the reserved hole 19 in the bottom mold 8, completing the demolding.

[0023] like Figure 4 As shown, the top of the positioning plate 16 is chamfered for insertion into the positioning hole 13. That is, when the positioning hole 13 and the positioning plate 16 do not coincide, during the sliding of the positioning plate 16 towards the insertion rod 12, part of the chamfer will contact the edge of the positioning hole 13 on the insertion rod 12. The chamfer converts the thrust of the electric push rod 17 into a guiding force, allowing the positioning plate 16 and the positioning hole 13 to engage smoothly.

[0024] As a further improvement, a push plate 14 is provided on the side wall of the first base 3 near the bottom mold 8, and the free end of the push plate 14 is set at a right angle. Furthermore, an insertion hole 161 adapted to the push plate 14 is also provided on the positioning plate 16. Thus, when the push plate 14 moves towards the bottom mold 8, it will be inserted into the insertion hole 161. With the right angle at the free end of the push plate 14 and the cooperation of the insertion hole 161, the positioning plate 16 will be pushed upwards, automatically inserting itself into the positioning hole 13, achieving mechanical locking of the insertion rod 12 by the positioning plate 16, and improving the connection stability between the side mold 7 and the bottom mold 8.

[0025] like Figure 2 As shown, the steel frame 6 and the second base 5 are slidably connected. Simultaneously, a limiting pin 11 is provided on the side wall of the second base 5 facing the bottom mold 8, and a fixing block 9 is provided on the bottom surface of the steel frame 6. The limiting pin 11 and the fixing block 9 are slidably connected, and a first spring 10 is sleeved on the limiting pin 11 between the second base 5 and the fixing block 9. To make the connection between the bottom mold 8 and the side mold 7 more stable, when the first hydraulic cylinder 2 pushes the first base 3 to move, the first base 3 will drive the second base 5 to move via the second hydraulic cylinder 4. Furthermore, the second base 5 will also push the steel frame 6 and the side mold 7 to move via the first spring 10 and the fixing block 9 until the side mold 7 and the bottom mold 8 are in contact. At this point, the insertion rod 12 stops moving. Then the first hydraulic cylinder 2 continues to work, which will compress the first spring 10 and push the push plate 14 into the insertion hole 161 of the positioning plate 16. As the push plate 14 is inserted, the positioning plate 16 moves upward and is inserted into the positioning hole 13 of the insertion rod 12, thereby completing the positioning plate 16 limiting the insertion rod 12.

[0026] It should be noted that the telescopic end of the electric push rod 17 abuts against the force plate 18, but the two are not fixedly connected. When the positioning plate 16 rises, the telescopic end of the electric push rod 17 does not contact the force plate 18. When the positioning plate 16 needs to descend, the electric push rod 17 is activated to push the force plate 18, causing it to lower the positioning plate 16. After the positioning plate 16 descends to the point of disengaging from the positioning hole 13, the telescopic rod of the electric push rod 17 retracts. In this way, when there is a gap between the side mold 7 and the bottom mold 8, the thrust of the first hydraulic cylinder 2 acts on the push plate, giving it the same thrust as the first hydraulic cylinder 2. At the same time, it drives the positioning plate 16 to better insert into the positioning hole 13, locking the bottom mold 8 and the side mold 7 together. This further promotes the connection between the bottom mold 8 and the side mold 7, reduces the connection gap between the bottom mold 8 and the side mold 7, and improves the sealing performance of the connection between the bottom mold 8 and the side mold 7.

[0027] like Figure 4As shown, in order to enable the positioning plate 16 to slide and be limited on the mounting frame 15, a protrusion is provided on the inner wall of the mounting frame 15, and a sliding groove adapted to the protrusion is opened on the side wall of the positioning plate 16. The sliding groove of the positioning plate 16 is slidably set with the protrusion of the mounting frame 15, thereby enabling the positioning plate 16 to slide within the mounting frame 15.

[0028] As another preferred embodiment, the second base 5 is provided with multiple support devices, and through holes 28 are provided on the second base 5 corresponding to the positions of each support device. Each support device includes a screw 26 that is slidably disposed within the through hole 28, and an adjustment part is threadedly connected to the screw 26. By adjusting the screw 26 through the adjustment part, the support of the second base 5 can be achieved, and the stability of the side mold 7 can be improved.

[0029] like Figure 5 As shown, the adjusting part includes two semi-arc-shaped threaded sleeves 21 threadedly connected to the screw 26. The two threaded sleeves 21 are combined to form a threaded connection around the screw 26. Each threaded sleeve 21 has a horizontally mounted support arm 22. A hollow nut 20 is located outside the two threaded sleeves 21, with a gap between the inner cavity of the nut 20 and the threaded sleeve 21. The support arm 22 passes through the nut 20 and the two are slidably mounted. A second spring 23 is fitted on the support arm 22 between the inner walls of the threaded sleeve 21 and the nut 20.

[0030] Slide the screw 26 into the through hole 28 of the second base 5. Adjust the extension of the screw 26 in the through hole 28 according to the actual height of the top surface of the bottom mold 8. Join the two semi-circular threaded sleeves 21 from both sides, forming a complete internal thread connection around the screw 26. Tighten the hollow nut 20 until it abuts against the bottom surface of the second base 5 to provide stable support for the second base 5. At this time, the second spring 23 is compressed between the inner walls of the threaded sleeves 21 and the nut 20, providing continuous elastic preload to prevent vibration from causing the threads to loosen. The combination of the two semi-circular threaded sleeves 21 surrounding the screw 26 eliminates the need to start tightening from the end of the screw 26 during installation; it can be directly clamped at any position on the screw 26, greatly simplifying the height adjustment operation and saving time.

[0031] The free end of the support arm 22 is equipped with a pull plate 24, which extends beyond the nut 20. The support arm 22 can be manually pulled out via the pull plate 24 to separate the two semi-circular threaded sleeves 21, making the operation simpler. When the threaded sleeves 21 need to be reset, simply release the pull plate 24, and the second spring 23 will push the threaded sleeves 21 back to their initial position. Figure 5As shown, a baffle 25 is rotatably provided on the outer wall of the nut 20 corresponding to the position of the pull plate 24, which is used to limit the pull plate 24. The worker can move the baffle 25 by hand. The cooperation between the baffle 25 and the pull plate 24 forms a mechanical limit, which, together with the elastic preload of the second spring 23, forms a double insurance to prevent the nut 20 from loosening during vibration. When it is necessary to release the limit of the pull plate 24, simply rotate the baffle 25 in the opposite direction to disengage it from the pull plate 24, and then pull the pull plate 24.

[0032] To connect the support device to the second base 5, locking devices are provided on the top surface of the second base 5 at the positions corresponding to each screw 26 to limit their movement. Each locking device includes two protrusions fixed to the top surface of the second base 5, with a limiting block 27 rotatably positioned between the two protrusions. The free end of the limiting block 27 is a right-angled guide, used to limit the movement of the screw 26. In use, the limiting block 27, rotatably positioned between the two protrusions, is flipped upwards to the open position, allowing space for the screw 26 to be inserted or its height adjusted. After the screw 26 is inserted, the position of the second base 5 can be adjusted and fixed via the adjustment mechanism. During demolding, first, the support of the adjustment mechanism on the second base 5 needs to be released. Then, the screw 26 is pushed upwards to the appropriate position, and the limiting block is rotated in the opposite direction to insert it into the corresponding thread of the screw 26. Under its own weight, the screw 26 pulls the limiting block 27, and the limiting block, supported by the second base 5, effectively limits the movement of the screw 26, making the operation simpler.

[0033] The first hydraulic cylinder 2, the second hydraulic cylinder 4, the electric push rod 17, and the motor 29 mentioned above can be connected to an external remote control to control the first hydraulic cylinder 2, the second hydraulic cylinder 4, the electric push rod 17, and the motor 29.

[0034] Working principle: The first hydraulic cylinder 2 extends, pushing the first base 3 towards the bottom mold 8. The first base 3, through the second hydraulic cylinder 4, drives the second base 5, and then through the first spring 10 and the fixing block 9, pushes the steel frame 6 and the side mold 7 together towards the bottom mold 8. After the side mold 7 makes contact with the bottom mold 8, the first hydraulic cylinder 2 continues to extend, the first spring 10 is compressed, and the second base 5 continues to move forward relative to the steel frame 6. This drives the push plate 14 on its side wall to move towards the bottom mold 8. The guide angle at the front end of the push plate 14 begins to contact the insertion hole 161 on the positioning plate 16. Under the action of the inclined surface of the guide angle, the push plate 14 pushes the positioning plate 16 upward, and the top of the positioning plate 16 gradually inserts into the positioning hole 13 on the insertion rod 12, completing the mechanical locking of the insertion rod 12. During demolding, the first hydraulic cylinder 2 retracts in the opposite direction, the first spring 10 returns to its free state, and sequentially drives the first base 3, the second base 5, and the side mold 7 to retreat. After the push plate 14 disengages from the insertion hole 161, the electric push rod 17 is activated, its telescopic end extends and pushes the force plate 18 at the bottom of the positioning plate 16, causing the positioning plate 16 to move downwards until it disengages from the positioning hole 13 on the insertion rod 12. Then, the continued movement of the first hydraulic cylinder 2 will pull the insertion rod 12 out of the reserved hole 19 in the bottom mold 8, and the side mold 7 will be completely separated from the bottom mold 8.

[0035] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A movable side formwork for prefabricated small box girders that is easy to assemble and disassemble, characterized in that: It includes a bottom mold (8) set on the ground, and adjustment devices are provided on both sides of the bottom mold (8) on the ground. Side molds (7) are provided on the adjustment devices via steel frames (6). The adjustment device includes a movable seat (1) on the ground, and a first base (3) is horizontally slidably mounted on the movable seat (1). A first hydraulic cylinder (2) is mounted on the movable seat (1), and the telescopic end of the first hydraulic cylinder (2) is connected to the first base (3). A second hydraulic cylinder (4) is vertically distributed on the top surface of the first base (3), and the extension and retraction ends of the second hydraulic cylinder (4) are connected through the second base (5); The steel frame (6) of the side mold (7) is located on the top surface of the second base (5); The side mold (7) and the bottom mold (8) are connected by a fastening device.

2. The easily detachable and assembleable movable side formwork for prefabricated small box girders according to claim 1, characterized in that: The fastening device includes a rod (12) provided on the bottom surface of the side mold (7), and the rod (12) corresponds to the reserved hole (19) of the bottom mold (8), and a positioning hole (13) is opened on the rod (12). The bottom mold (8) has an installation frame (15) on its side wall, and a positioning plate (16) is slidably provided inside the installation frame (15). The bottom surface of the positioning plate (16) is provided with a force-bearing plate (18). An electric push rod (17) is provided on the side wall of the mounting frame (15), and the electric push rod (17) cooperates with the force plate (18); The top of the positioning plate (16) is set with a guide right angle for insertion into the positioning hole (13).

3. The easily detachable and assembleable movable side formwork for prefabricated small box girders according to claim 2, characterized in that: The first base (3) has a push plate (14) on its side wall near the bottom mold (8), and the free end of the push plate (14) is set with a bevel. The positioning plate (16) has a socket (161) that is compatible with the push plate (14). The second base (5) is provided with a limiting pin (11) on the side wall facing the bottom mold (8), and a fixing block (9) is provided on the bottom surface of the steel frame (6). The limiting pin (11) and the fixing block (9) are slidably connected, and a first spring (10) is sleeved on the limiting pin (11) between the second base (5) and the fixing block (9). The steel frame (6) and the second base (5) are slidably connected.

4. The easily detachable and assembleable movable side formwork for precast small box girders according to claim 3, characterized in that: Multiple support devices are distributed on the second base (5), and through holes (28) are opened on the second base (5) corresponding to the positions of each support device. The support device includes a screw (26) that is slidably disposed in the through hole (28) and an adjustment part that is threadedly connected to the screw (26).

5. A movable side formwork for prefabricated small box girder that is easy to assemble and disassemble according to claim 4, characterized in that: The adjustment part includes two semi-arc-shaped threaded sleeves (21) threadedly connected to the screw (26). The two threaded sleeves (21) are combined to form an enclosure around the screw (26). Each threaded sleeve (21) is provided with a horizontal support arm (22). Hollow nuts (20) are provided outside the two threaded sleeves (21), and there is a gap between the inner cavity of the nut (20) and the threaded sleeve (21); The support arm (22) passes through the nut (20) and the two are slidably arranged. A second spring (23) is sleeved on the support arm (22) between the inner wall of the threaded sleeve (21) and the nut (20).

6. A movable side formwork for prefabricated small box girder that is easy to assemble and disassemble according to claim 5, characterized in that: The free end of the support arm (22) is provided with a pull plate (24), and the pull plate (24) extends beyond the nut (20).

7. A movable side formwork for prefabricated small box girder that is easy to assemble and disassemble according to claim 6, characterized in that: The outer wall of the nut (20) is provided with a baffle (25) corresponding to the position of the pull plate (24) for limiting the pull plate (24).

8. A movable side formwork for prefabricated small box girder that is easy to assemble and disassemble according to claim 4, characterized in that: The top surface of the second base (5) is provided with locking parts that limit the position of each screw (26); The locking component includes two protrusions fixed on the top surface of the second base (5), and a limiting block (27) is provided between the two protrusions. The free end of the limiting block (27) is a right angle, which is used to limit the screw (26).

9. A movable side formwork for prefabricated small box girder that is easy to assemble and disassemble according to claim 1, characterized in that: The ground is provided with a guide rail, and the bottom surface of the movable seat (1) is provided with a walking wheel for walking on the guide rail. The movable seat (1) is provided with a motor (29), and the output end of the motor (29) is connected to any of the walking wheels.

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