Assembly type construction device for bridge and construction method

Abstract

This application relates to a construction device and method for prefabricated bridges, belonging to the field of bridge construction technology. It includes bridge piers and a main beam, with a track section between the piers and the main beam. The track section includes a horizontal plate located between the main beam and the piers and a vertical plate located on one side of the horizontal plate. A notch is provided on the horizontal plate opposite to the two piers at both ends. A movable plate is engaged with the horizontal plate at the notch. A slide rail is provided on the pier, located on one side of the track section. A movable plate is slidably mounted on the slide rail. A driving component is provided on the movable plate to move the movable plate along the slide rail. A clamping plate is also slidably mounted on the movable plate. A moving component is provided on the movable plate to drive the clamping plate closer to or away from the vertical plate. A connector is provided on the clamping plate for connecting to the vertical plate. This application has the effect of reducing construction costs.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a construction device and construction method for prefabricated bridges. Background Technology

[0002] Prefabricated bridges involve dividing tall piers and abutments vertically into several horizontally modular components. These components are then cast in prefabrication yards around the bridge site, transported to the site by truck or ship, hoisted and assembled, and finally the bridge deck is joined to the piers and abutments, achieving rapid construction. Therefore, fully prefabricated bridge structures are an effective means to accelerate construction speed, reduce on-site pollution, and achieve low-carbon construction. Guided by national policies and technological development, prefabricated bridge structures are being used more and more widely in various engineering projects.

[0003] The existing invention patent with authorization announcement number CN112227212A discloses a prefabricated bridge construction device, which specifically discloses a track groove set on the bridge pier, a main beam installed in the track groove, a traction device used to traction the main beam to move in the track groove, and after the main beam is tractioned, the track groove and the main beam are fixed together.

[0004] Regarding the aforementioned technologies, the track trough is permanently fixed between the main beam and the pier. During the installation of prefabricated bridges, the track trough, which is the same length as the bridge, will be consumed, greatly increasing the construction cost. Summary of the Invention

[0005] To reduce construction costs, this application provides a construction device for prefabricated bridges.

[0006] On the one hand, the prefabricated bridge construction device provided in this application adopts the following technical solution:

[0007] A prefabricated bridge construction device includes a pier and a main beam. A track section is provided between the pier and the main beam. The track section includes a horizontal plate located between the main beam and the pier and a vertical plate located on one side of the horizontal plate. A notch is provided on the horizontal plate opposite to the two piers. A movable plate is engaged with the horizontal plate at the notch. A slide rail is provided on the pier and on one side of the track section. A movable plate is slidably mounted on the slide rail. A driving component for driving the movable plate to move along the slide rail is provided on the movable plate. A clamping plate is also slidably mounted on the movable plate. A moving component for driving the clamping plate to move closer to or away from the vertical plate is provided on the movable plate. A connector for connecting to the vertical plate is provided on the clamping plate.

[0008] By adopting the above technical solution, the track section is installed on the bridge pier. After the main beam is pulled and fixed in place, the clamping plate is moved close to the vertical plate. The vertical plate is connected to the clamping plate using connectors, and the clamping plate is driven to move away from the main beam. Since the force between the main beam and the bridge pier is transmitted through the movable plate on the bridge pier, the horizontal plate is pulled out from between the bridge pier and the main beam. The horizontal plate can be reused after a new movable plate is installed, avoiding the need to consume a track section of the same length as the bridge during construction and saving construction costs.

[0009] Optionally, the edge of the movable plate is provided with a snap-fit ​​block, and the horizontal plate is provided with a snap-fit ​​groove at the notch to engage with the snap-fit ​​block.

[0010] By adopting the above technical solution, the locking block on the edge of the movable plate engages with the horizontal plate through the locking groove, thereby facilitating the locking of the movable plate onto the horizontal plate.

[0011] Optionally, the drive assembly includes a drive motor and a roller. The roller is rotatably mounted on the bottom of the movable plate and abuts against the slide rail. The drive motor is mounted on the movable plate and its output shaft is fixedly connected to the roller along the same axis.

[0012] By adopting the above technical solution, the drive motor is started, and the drive motor drives the roller to rotate, thereby facilitating the movement of the moving plate on the slide rail.

[0013] Optionally, a guide rail is provided on the movable plate in a direction perpendicular to the slide rail, the clamping plate is slidably disposed on the guide rail, and the movable component is connected to the clamping plate.

[0014] By adopting the above technical solution, the clamping plate is slidably installed on the guide rail, which makes it easy to drive the clamping plate closer to or away from the vertical plate.

[0015] Optionally, the moving component includes a lead screw and a servo motor. The lead screw is rotatably mounted on the moving plate and extends toward the vertical plate. A guide block is provided at the bottom of the clamping plate, and the guide block is threaded onto the lead screw. The servo motor is mounted on the moving plate and is fixedly connected to the lead screw along the same axis.

[0016] By adopting the above technical solution, the servo motor is started, and the servo motor drives the lead screw to rotate, thereby driving the clamping plate to move along the direction of the lead screw, which makes it easier to drive the clamping plate to approach or move away from the vertical plate.

[0017] Optionally, the clamping plate is an L-shaped plate, and a snap-fit ​​hole is provided on the vertical plate. A fixing rod is horizontally arranged in the snap-fit ​​hole. The connector is arranged on the vertical section of the clamping plate and is directly opposite to the fixing rod. The connector is used to fix the clamping rod.

[0018] By adopting the above technical solution, the L-shaped clamping plate is parallel to the track section, which makes it easy for the clamping plate to move to fit with the track section, thus facilitating the subsequent horizontal extraction of the track section from below the main beam.

[0019] Optionally, the connecting component includes a connecting rod, a spring, and a cylinder. The vertical section of the clamping plate has a mounting hole. The connecting rod is rotatably mounted on the clamping plate and located within the mounting hole. A barb is provided at the end of the connecting rod facing the vertical plate. The spring is disposed between the connecting rod and the clamping plate and is used to drive the connecting rod to rotate downward until the barb engages with the fixing rod. The cylinder is disposed on the clamping plate, and the piston rod of the cylinder extends vertically downward and is connected to the connecting rod.

[0020] By adopting the above technical solution, when the clamping plate is connected to the vertical plate, the clamping plate is driven to move towards the vertical plate, the barb on the connecting rod approaches the fixed rod, and the cylinder drives the barb to rotate and engage with the fixed rod. At this time, the clamping plate and the vertical plate are connected through the connecting rod, driving the clamping plate to move, thereby driving the track section to move, so as to facilitate fixing the track section on the clamping plate.

[0021] Optionally, a snap-fit ​​box is provided on the horizontal plate at the notch, and a snap-fit ​​rod is slidably disposed inside the snap-fit ​​box. The snap-fit ​​rod extends outside the snap-fit ​​box and to the notch. A tension spring is provided inside the snap-fit ​​box and outside the snap-fit ​​rod. The tension spring causes the snap-fit ​​rod to always have a tendency to move toward the notch. An electromagnet is provided at the end of the snap-fit ​​box away from the snap-fit ​​rod.

[0022] By adopting the above technical solution, when the movable plate is installed in the notch of the horizontal plate, the electromagnet is turned off, and the locking rod extends to the notch under the action of the tension spring, blocking and limiting the movable plate on the horizontal plate to prevent the movable plate from detaching from the horizontal plate; when the main beam is pulled and installed in place, the electromagnet is activated to attract the locking rod into the locking box, so that the movable plate can be detached from the horizontal plate, making it easy to remove the horizontal plate from under the main beam.

[0023] On the other hand, this application provides a method for constructing prefabricated bridges, including the following steps:

[0024] S1: When installing the main beam, fix the track section to the clamping plate, and use the drive assembly to move the movable plate to the main beam installation location; S2: The movable assembly drives the clamping plate to move the track section to the pier, and the connector separates the clamping plate from the vertical plate, placing the track section on the pier; S3: Fix the movable plate to the pier as a whole, and use external traction equipment to pull the main beam to move on the track section; S4: After the main beam is installed in place, use the connector to fix the clamping plate to the track section, and use the drive assembly to move the clamping plate away from the main beam, separating the horizontal plate from the movable plate; S5: Drive the horizontal plate to the bridgehead, install a new movable plate, and reuse it.

[0025] By adopting the above technical solution, after the main beam is pulled into place and fixedly connected to the pier, the movable clamping plate is connected to the vertical plate, and the horizontal plate under the main beam is pulled out. After a new movable plate is installed on the horizontal plate, the track section can be reused. Thus, only the movable plate needs to be consumed, instead of the entire track section, saving construction costs.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Install the track section on the pier. After the main beam is pulled and fixed in place, move the clamping plate close to the vertical plate. Use the connector to connect the vertical plate and the clamping plate, and drive the clamping plate away from the main beam. Since the force between the main beam and the pier is transmitted through the movable plate on the pier, the horizontal plate is pulled out from between the pier and the main beam. The horizontal plate can be reused after a new movable plate is installed, avoiding the consumption of track sections of the same length as the bridge during construction and saving construction costs.

[0028] 2. Start the servo motor, which drives the lead screw to rotate, thereby driving the gripping plate to move along the direction of the lead screw, thus making it easier to drive the gripping plate closer to or away from the vertical plate.

[0029] 3. When the movable plate is installed in the notch of the horizontal plate, turn off the electromagnet. The locking rod extends to the notch under the action of the tension spring, blocking and limiting the movable plate on the horizontal plate to prevent it from detaching from the horizontal plate. After the main beam is installed in place, turn on the electromagnet to attract the locking rod into the locking box, so that the movable plate can be detached from the horizontal plate, making it easy to remove the horizontal plate from under the main beam. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0031] Figure 2 This is a schematic diagram illustrating the structure of the track segment in the embodiments of this application.

[0032] Figure 3 This is a schematic diagram used to illustrate the card box structure in the embodiment itself.

[0033] Figure 4 This is a schematic diagram illustrating the structure of the active panel in the embodiments of this application.

[0034] Figure 5 This is a schematic diagram used to illustrate the connector structure in the embodiments of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Pier; 11. Main beam; 2. Track section; 21. Horizontal plate; 211. Snap-fit ​​groove; 22. Vertical plate; 221. Snap-fit ​​hole; 222. Fixing rod; 23. Notch; 24. Movable plate; 241. Snap-fit ​​block; 3. Slide rail; 31. Moving plate; 32. Clamping plate; 321. Mounting hole; 33. Guide rail; 4. Drive assembly; 41. Drive motor; 42. Roller; 5. Moving assembly; 51. Lead screw; 52. Servo motor; 53. Guide block; 6. Connector; 61. Connecting rod; 611. Barb; 62. Spring; 63. Cylinder; 7. Snap-fit ​​box; 71. Snap-fit ​​rod; 72. Tension spring; 73. Electromagnet. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses a construction device for prefabricated bridges, referring to... Figure 1 and Figure 2 A prefabricated bridge construction device includes multiple piers 1 spaced apart and a main beam 11 overlapping the piers 1 at both ends. A track section 2, made of steel plate, is installed between the piers 1 and the main beam 11. The track section 2 includes a horizontal plate 21 and a vertical plate 22. The horizontal plate 21 is located between the piers 1 and the main beam 11, and the vertical plate 22 is fixedly connected to one edge of the horizontal plate 21, and the vertical plate 22 is perpendicular to the surface of the horizontal plate 21. U-shaped notches 23 are opened on the horizontal plate 21 at the locations opposite to the two piers 1 at both ends. A matching movable plate 24 is snapped onto the horizontal plate 21 within the notches 23, and the upper surface of the movable plate 24 is flush with the upper surface of the horizontal plate 21. A slide rail 3 is detachably installed on the pier 1 on one side of the track section 2 via a bracket, and the length direction of the slide rail 3 is along the length direction of the bridge. A movable plate 31 is slidably mounted on the slide rail 3. A drive assembly 4 for driving the movable plate 31 to move along the slide rail 3 is mounted on the movable plate 31. A clamping plate 32 is slidably mounted on the movable plate 31. A movable assembly 5 for driving the clamping plate 32 to move closer to or away from the vertical plate 22 is also mounted on the movable plate 31. A connector 6 for connecting to the vertical plate 22 is provided on the clamping plate 32.

[0039] During the installation of the main beam 11, the track section 2 is installed on the pier 1. Using external traction and positioning equipment, the main beam 11 is pulled and fixed onto the pier 1, driving the clamping plate 32 to approach the vertical plate 22. The vertical plate 22 is connected to the clamping plate 32 using the connector 6, and the clamping plate 32 is moved away from the main beam 11 by the moving component 5. Since the pier 1 only contacts the movable plate 24, the weight of the main beam 11 is transferred to the pier 1 through the movable plate 24 on the pier 1, thereby allowing the horizontal plate 21 to be pulled out from between the pier 1 and the main beam 11 through the clamping plate 32. The horizontal plate 21 can be reused after a new movable plate 24 is installed, avoiding the need to consume the track section 2 of the same length as the bridge during construction, thus saving construction costs.

[0040] Reference Figure 2 and Figure 3 A snap-fit ​​block 241 is installed around the edge of the movable plate 24, and a snap-fit ​​groove 211 is formed around the horizontal plate 21 at the notch 23. The snap-fit ​​block 241 is slidably snapped into the snap-fit ​​groove 211. A snap-fit ​​box 7 is installed on the side of the horizontal plate 21 at the notch 23. The snap-fit ​​box 7 is a hollow box with an opening facing the notch 23. A snap-fit ​​rod 71 is slidably installed inside the snap-fit ​​box 7, extending towards the notch 23 through a through hole in the snap-fit ​​box 7. A tension spring 72 is installed inside the snap-fit ​​box 7 and around the snap-fit ​​rod 71, causing the snap-fit ​​rod 71 to always tend to move outward from the snap-fit ​​box 7. An electromagnet 73 is installed at the end of the snap-fit ​​box 7 away from the snap-fit ​​rod 71. The snap-fit ​​rod 71 is made of magnetic metal.

[0041] The movable plate 24 is engaged with the horizontal plate 21 via the engagement of the locking block 241 and the locking groove 211. After the movable plate 24 is fully engaged with the horizontal plate 21, the locking rod 71 moves to the outside of the locking box 7 under the action of the tension spring 72 and blocks and limits the movable plate 24, preventing it from detaching from the horizontal plate 21. When the horizontal plate 21 needs to be removed after the main beam 11 is installed in place, the electromagnet 73 is activated to attract and move the locking rod 71 into the locking box 7, facilitating the detachment of the horizontal plate 21 from the movable plate 24.

[0042] Reference Figure 1 and Figure 4Two movable plates 31 are mounted on the slide rail 3. The distance between the two movable plates 31 is less than the length of the main beam 11, and the two movable plates 31 are fixedly connected by a reinforcing rod. The drive assembly 4 includes a drive motor 41 and rollers 42. The slide rail 3 has a T-shaped cross-section. Multiple rollers 42 are rotatably mounted on the bottom of the movable plates 31. The rollers 42 abut against the upper surface of the slide rail 3. A C-shaped baffle is installed on the movable plate 31 outside the rollers 42. The baffle is fitted outside the slide rail 3 to prevent the rollers 42 from detaching from the slide rail 3. The drive motor 41 is mounted on the movable plate 31, and the output shaft of the drive motor 41 is coaxially and fixedly connected to one of the rollers 42. The movable plate 31 is a rectangular plate, and the length direction of the movable plate 31 is perpendicular to the length direction of the slide rail 3. A guide rail 33 is installed on the movable plate 31, and the length direction of the guide rail 33 is perpendicular to the length direction of the slide rail 3. The clamping plate 32 is slidably installed on the guide rail 33. The movable component 5 is installed on the movable plate 31 and connected to the clamping plate 32.

[0043] Reference Figure 1 and Figure 4 The moving component 5 includes a lead screw 51 and a servo motor 52. The lead screw 51 is rotatably mounted on the moving plate 31. The length direction of the lead screw 51 is parallel to the length direction of the guide rail 33. A guide block 53 is installed at the bottom of the clamping plate 32. The guide block 53 is threaded onto the lead screw 51. The servo motor 52 is mounted on the moving plate 31 and is fixedly connected to the lead screw 51 along the same axis.

[0044] When the moving plate 31 moves along the slide rail 3, the drive motor 41 is activated, which drives the roller 42 to rotate, thereby driving the moving plate 31 to move along the slide rail 3 so that the moving plate 31 can move to face different track segments 2. When the track segment 2 moves closer to or away from the main beam 11, the servo motor 52 is activated, which drives the lead screw 51 to rotate, thereby driving the clamping plate 32 threaded on the lead screw 51 to move closer to or away from the main beam 11, thereby driving the track segment 2 connected to the clamping plate 32 to move closer to or away from the main beam 11, making it easier to pull the track segment 2 out from under the main beam 11.

[0045] Reference Figure 4 and Figure 5The clamping plate 32 is an L-shaped plate. A snap-fit ​​hole 221 is provided on the side wall of the vertical plate 22 opposite to the main beam 11. A fixing rod 222 is horizontally fixedly installed on the vertical plate 22 within the snap-fit ​​hole 221. A connecting piece 6 is installed on the vertical section of the clamping plate 32 and faces the fixing rod 222. The connecting piece 6 is used to connect and fix to the fixing rod 222. The connecting piece 6 includes a connecting rod 61, a spring 62, and a cylinder 63. A mounting hole 321 is provided on the vertical section of the clamping plate 32. The connecting rod 61 is rotatably installed on the clamping plate 32 and located within the mounting hole 321. A barb 611 is installed on the end of the connecting rod 61 facing the vertical plate 22, with the opening of the barb 611 facing downwards. A spring 62 is installed between the connecting rod 61 and the clamping plate 32. The spring 62 causes the end of the connecting rod 61 facing the vertical plate 22 to always have a downward rotation tendency, thereby causing the barb 611 at the end of the connecting rod 61 to rotate and engage with the fixed rod 222. The cylinder 63 is fixedly installed on the side wall of the clamping plate 32 away from the main beam 11. The piston rod of the cylinder 63 extends vertically downward. A positioning hole is opened at the end of the connecting rod 61 away from the vertical plate 22. A positioning rod is slidably installed in the positioning hole. The end of the piston rod of the cylinder 63 is connected to the positioning rod.

[0046] The implementation principle of a prefabricated bridge construction device according to an embodiment of this application is as follows: the track section 2 is installed on the pier 1. After the main beam 11 is pulled and fixed in place, the clamping plate 32 is moved close to the vertical plate 22. The vertical plate 22 is connected to the clamping plate 32 by the connector 6. The clamping plate 32 is driven to move away from the main beam 11, and the horizontal plate 21 is pulled out from between the pier 1 and the main beam 11. The horizontal plate 21 can be reused after a new movable plate 24 is installed. During the construction process, only the movable plate 24 is permanently fixed between the pier 1 and the main beam 11. The track section 2 of the same length as the bridge is not consumed during the construction process, thus saving construction costs.

[0047] This application also discloses a method for constructing prefabricated bridges, including the following steps:

[0048] S1: When installing the main beam 11, fix the track section 2 on the clamping plate 32, and use the drive assembly 4 to drive the moving plate 31 to the installation position of the main beam 11.

[0049] S2: The moving component 5 drives the clamping plate 32 to move the track section 2 to the pier 1, disengaging the clamping plate 32 from the vertical plate 22, so that the track section 2 is placed on the pier 1.

[0050] S3: Fix the movable plate 24 to the pier 1 as a whole. Use external traction and positioning equipment to pull the main beam 11 to move on the track section 2. After the main beam 11 is moved into place, fix the main beam 11 to the movable plate 24 and the pier 1.

[0051] S4: After the main beam 11 is installed in place, move the clamping plate 32 close to the track section 2, use the connector 6 to fix the clamping plate 32 to the track section 2, use the moving component 5 to drive the clamping plate 32 to move away from the main beam 11, so that the horizontal plate 21 is separated from the movable plate 24, until the track section 2 is pulled out from between the pier 1 and the main beam 11.

[0052] S5: Drive the horizontal plate 21 to the bridgehead, install the new movable plate 24 on the horizontal plate 21, and put the track section 2 back into use.

[0053] Finally, it should be noted that in the description of this application, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction device for prefabricated bridges, comprising a pier (1) and a main beam (11), wherein a track section (2) is provided between the pier (1) and the main beam (11), the track section (2) comprising a horizontal plate (21) located between the main beam (11) and the pier (1) and a vertical plate (22) located on one side of the horizontal plate (21), characterized in that: A notch (23) is provided on the horizontal plate (21) opposite to the two end piers (1). A movable plate (24) is snapped onto the horizontal plate (21) at the notch (23). The upper surface of the movable plate (24) is flush with the upper surface of the horizontal plate (21). A slide rail (3) is provided on the pier (1) on one side of the track section (2). A movable plate (31) is slidably provided on the slide rail (3). A driving component (4) is provided on the movable plate (31) for driving the movable plate (31) to move along the slide rail (3). A clamping plate (32) is also slidably provided on the movable plate (31). A moving component (5) is provided on the movable plate (31) for driving the clamping plate (32) to move closer to or away from the vertical plate (22). A connector (6) is provided on the clamping plate (32) for connecting with the vertical plate (22). Since the pier (1) only contacts the movable plate (24), the weight of the main beam (11) is transferred to the pier (1) through the movable plate (24) on the pier (1), so that the horizontal plate (21) can be pulled out from between the pier (1) and the main beam (11) by the clamping plate (32); and the horizontal plate (21) can be reused after a new movable plate (24) is installed, avoiding the need to consume a track section (2) of the same length as the bridge during construction, thus saving construction costs.

2. The prefabricated bridge construction device according to claim 1, characterized in that: The edge of the movable plate (24) is surrounded by a snap-fit ​​block (241), and the horizontal plate (21) is provided with a snap-fit ​​groove (211) that engages with the snap-fit ​​block (241) at the notch (23).

3. The prefabricated bridge construction device according to claim 1, characterized in that: The drive assembly (4) includes a drive motor (41) and a roller (42). The roller (42) is rotatably mounted on the bottom of the movable plate (31). The roller (42) abuts against the slide rail (3). The drive motor (41) is mounted on the movable plate (31) and the output shaft of the drive motor (41) is fixedly connected to the roller (42) on the same axis.

4. The prefabricated bridge construction device according to claim 1, characterized in that: The movable plate (31) is provided with a guide rail (33) perpendicular to the slide rail (3), the clamping plate (32) is slidably disposed on the guide rail (33), and the movable component (5) is connected to the clamping plate (32).

5. A construction device for prefabricated bridges according to claim 4, characterized in that: The moving component (5) includes a lead screw (51) and a servo motor (52). The lead screw (51) is rotatably mounted on the moving plate (31) and extends toward the vertical plate (22). A guide block (53) is provided at the bottom of the clamping plate (32). The guide block (53) is threaded onto the lead screw (51). The servo motor (52) is mounted on the moving plate (31) and is fixedly connected to the lead screw (51) along the same axis.

6. The prefabricated bridge construction device according to claim 1, characterized in that: The clamping plate (32) is an L-shaped plate. The vertical plate (22) has a snap-fit ​​hole (221). A fixing rod (222) is horizontally arranged in the snap-fit ​​hole (221). The connector (6) is arranged on the vertical section of the clamping plate (32) and is directly opposite to the fixing rod (222). The connector (6) is used to fix the fixing rod (222).

7. A construction device for prefabricated bridges according to claim 6, characterized in that: The connecting member (6) includes a connecting rod (61), a spring (62), and a cylinder (63). The vertical section of the clamping plate (32) has an installation hole (321). The connecting rod (61) is rotatably mounted on the clamping plate (32) and located in the installation hole (321). The end of the connecting rod (61) facing the vertical plate (22) is provided with a barb (611). The spring (62) is located between the connecting rod (61) and the clamping plate (32) and is used to drive the connecting rod (61) to rotate downward until the barb (611) engages with the fixing rod (222). The cylinder (63) is mounted on the clamping plate (32). The piston rod of the cylinder (63) extends vertically downward and is connected to the connecting rod (61).

8. A construction device for prefabricated bridges according to claim 1, characterized in that: A snap-fit ​​box (7) is provided on the horizontal plate (21) at the notch (23). A snap-fit ​​rod (71) is slidably provided inside the snap-fit ​​box (7). The snap-fit ​​rod (71) extends outside the snap-fit ​​box (7) and extends to the notch (23). A tension spring (72) is provided inside the snap-fit ​​box (7) and outside the snap-fit ​​rod (71). The tension spring (72) makes the snap-fit ​​rod (71) always tend to move toward the notch (23). An electromagnet (73) is provided at one end of the snap-fit ​​box (7) away from the snap-fit ​​rod (71).

9. A method for constructing prefabricated bridges, employing a construction device for prefabricated bridges as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: When installing the main beam (11), fix the track section (2) on the clamping plate (32) and use the drive assembly (4) to drive the moving plate (31) to the installation location of the main beam (11); S2: The moving component (5) drives the clamping plate (32) to move the track section (2) to the pier (1), and the connector (6) causes the clamping plate (32) to disengage from the vertical plate (22), and the track section (2) is placed on the pier (1); S3: Fix the movable plate (24) to the pier (1) as a whole, and use external traction equipment to pull the main beam (11) to move on the track section (2); S4: After the main beam (11) is installed in place, the clamping plate (32) is fixed to the track section (2) using the connector (6), and the clamping plate (32) is moved away from the main beam (11) using the moving component (5) to separate the horizontal plate (21) from the movable plate (24). S5: Drive the horizontal plate (21) to the bridge head, install a new movable plate (24) on the horizontal plate (21) for reuse.

Images