Bridge erecting machine for municipal bridges

Abstract

The application relates to the field of bridge erecting machines, in particular to a municipal bridge erecting machine which comprises a main beam, a guide beam arranged on the main beam and a hoisting trolley used for hoisting beam pieces, the hoisting trolley is slidingly arranged on the main beam; the main beam and the guide beam are each provided with at least one supporting leg used for supporting, and the main beam is slidingly provided with at least two supporting assemblies, the lower end of the supporting assembly is used for connecting a pier or a mounted beam piece; and the supporting end of the supporting leg and the supporting assembly can be lifted. The application can relatively stably realize the stepping of the bridge erecting machine.

Description

Technical Field

[0001] This application relates to the field of bridge erecting machines, and in particular to a bridge erecting machine for municipal bridges. Background Technology

[0002] A bridge erecting machine is a device that places prefabricated bridge beams onto prefabricated bridge piers. Its main function is to lift the prefabricated beams, transport them to the piers, and then place both ends of the beams on top of two adjacent piers to shorten the bridge construction cycle.

[0003] The bridge erecting machine mainly consists of a main beam, multiple supporting columns distributed on the main beam, and a hoisting trolley slidably mounted on the main beam. The supporting columns are perpendicular to the main beam and fixedly connected to each other. In use, the lower ends of the supporting columns are fixed to the piers and the tops of the pre-installed beam segments, maintaining a certain height between the main beam and the bridge deck. Then, the hoisting trolley transports the precast beam segments to the top of the piers. After the beam segments are assembled, the main beam and supporting columns are lifted as a whole and moved toward the piers where the beam segments have not yet been assembled, using tracks or moving trolleys on the bridge deck.

[0004] However, in actual use, the main beam and supporting columns move as a whole during the movement. This can easily cause the extended portion of the main beam to bend downwards due to its own weight. Simultaneously, it shifts the center of gravity forward. If the supporting columns of the extended main beam are required to engage with the piers, the entire main beam needs to be moved upwards, which raises the center of gravity and affects stability during use. Therefore, how to achieve relatively stable stepping of the bridge erecting machine is a problem that urgently needs to be solved. Summary of the Invention

[0005] In order to achieve relatively stable stepping of the bridge erecting machine, this application provides a bridge erecting machine for municipal bridges.

[0006] This application provides a bridge erecting machine for municipal bridges, which adopts the following technical solution:

[0007] A bridge erecting machine for municipal bridges includes a main beam, a guide beam disposed on the main beam, and a hoisting trolley for hoisting bridge beam segments. The hoisting trolley is slidably disposed on the main beam. Both the main beam and the guide beam are provided with at least one support leg for support, and the main beam is slidably disposed with at least two support components. The lower end of each support component is used to connect to a bridge pier or an installed bridge beam segment. The support ends of the support legs and support components are liftable.

[0008] By adopting the above technical solution, when it is necessary to move the main beam forward, the support components only need to be located near the two ends of the main beam. Then, the guide beam and the main beam are raised, and finally the guide beam or the guide beam and the main beam slide synchronously relative to the support components to achieve the forward movement of the guide beam or the guide beam and the main beam. At this time, the guide beam and the main beam are lowered and the outriggers are connected to the piers below or the already installed beam segments. Through the support throughout the process, the overall stable stepping of the bridge erecting machine is achieved.

[0009] Optionally, the support assembly includes a height-adjustable support column and a sliding member disposed on the top of the support column. The sliding member includes a sliding guide beam and a plurality of sliding wheels rotatably connected to the support column. The sliding guide beam is fixedly connected to the main beam. The plurality of sliding wheels are divided into two groups, and the two groups are respectively located on the upper and lower sides of the sliding guide beam. Each group contains at least two sliding wheels. The sliding guide beam is clamped between the two groups of sliding wheels.

[0010] By adopting the above technical solution, when the main beam support column slides, the sliding guide beam can be clamped by two sets of sliding wheels, which restricts the relative rotation between the guide beam and the main beam; at the same time, the sliding wheels reduce the resistance when the guide beam slides relative to the main beam, so as to facilitate the support column to change the support point of the main beam.

[0011] Optionally, the sliding wheel is rotatably connected to the supporting column via a sliding support, and the sliding support is provided with a locking element for detachably connecting the main beam.

[0012] By adopting the above technical solution, after the support column slides to the corresponding position, it can be locked by locking components to optimize the stability of the beam during hoisting; at the same time, the sliding support allows for relatively convenient installation of sliding wheels.

[0013] Optionally, the locking element is a threaded rod that passes through the sliding support, and the locking element is used for threaded connection or fastening of the main beam.

[0014] By adopting the above technical solution, the sliding lock between the guide beam and the support column is achieved through the threaded connection or snap-fit ​​of the locking component.

[0015] Optionally, the main beam is provided with a control assembly for controlling the sliding of the guide beam. The control assembly includes two control wheels rotatably connected to the main beam, a drive component for driving the two control wheels to rotate in opposite directions, and a control cable. The two ends of the control cable are respectively connected to the two control wheels. The main beam is rotatably connected to a traction wheel. The control cable is wound around the traction wheel, and the guide beam is fixedly connected to the portion of the control cable located between the traction wheel and the control wheel.

[0016] By adopting the above technical solution, when the main beam is to step forward, and the guide beam needs to extend first and support the end of the main beam with the outriggers, the drive unit only needs to control the two control wheels to rotate in opposite directions and make the control cable rotate, in conjunction with the traction of the traction wheel, to achieve the control of the extension or retraction of the guide beam.

[0017] Optionally, the main beam is provided with a locking mechanism, which includes two locking pins rotatably connected to the guide beam and a locking elastic element disposed on the locking pins. The swing ends of the two locking pins are located on opposite sides of the ends connected to the guide beam, and the main beam is provided with a locking rack for abutting against the ends of the locking pins. The locking elastic element is used to drive the locking pins to abut against the locking rack, and the two locking pins are connected to a traction cable fixed to the control cable. The traction cable is used to pull the locking pins away from the locking rack when the control cable pulls the guide beam.

[0018] By adopting the above technical solution, when the control cable is not being pulled, the locking pin abuts against the locking rack under the action of the locking elastic element. Since the swing ends of the two locking pins extend towards each other, the guide beam can be slidably locked relative to the main beam in both directions by abutting against the locking rack. At the same time, during traction, since the traction cable will be pulled by the control cable in sync, it will pull the locking pin and disengage it from the locking rack, thereby reducing interference to the control cable when pulling the guide beam.

[0019] Optionally, a guide wheel is provided on the side of the two traction cables that are far apart, and the edges of the two traction cables that are far apart are wrapped around and overlapped with the guide wheel.

[0020] By adopting the above technical solution, the guide wheel can make the tension angle of the traction cable relatively uniform when it is pulled by the control cable, so as to reduce the possibility that the guide beam cannot slide due to the locking pin not disengaging when the guide beam slides.

[0021] Optionally, the locking elastic element is a torsion spring, and the two torsion arms of the locking elastic element are respectively fixed to the guide beam and the locking pin.

[0022] By adopting the above technical solution, the locking pin can be driven to swing toward the locking rack by the elastic force of the locking elastic element itself.

[0023] Optionally, the control cable is connected to the guide beam via a fastening assembly. The fastening assembly includes a fastening seat disposed on the guide beam and two wedge pins. The fastening seat is formed with two opposing openings, and the width of the opposing opening edges is smaller than the width inside the pin opening. The wedge pins are correspondingly engaged in the pin openings. A portion of the control cable is recessed from the small end of the pin opening into the pin opening, and the portion of the control cable located inside the pin opening is wound around the large ends of the two wedge pins.

[0024] By adopting the above technical solution, when the control cable pulls the guide beam, it will simultaneously apply the tendency of the wedge pin to slide towards the small end of the pin opening, and make the wedge pin further secure to the inner wall of the pin opening. This achieves the effect that the greater the tension, the better the securing effect of the control cable, which can effectively reduce the possibility of traction failure. Moreover, compared with using the wire buckle method to fix the control cable, it can also effectively reduce the possibility of damage to the control cable.

[0025] Optionally, the fastening seat is slidably connected to the guide beam, and fastening springs are respectively provided at both ends of the fastening seat along the sliding direction, with the end of the fastening spring away from the fastening seat connected to the guide beam.

[0026] By adopting the above technical solution, the control cable, during the process of pulling the guide beam, compresses and stretches the fastening spring through the fastening seat, so that the fastening seat has a certain amount of room for movement relative to the guide beam. At this time, the guide beam can be buffered when it slides and locks relative to the main beam, so as to reduce the impact force.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] When transferring the bridge erecting machine, firstly, the two sliding supports are moved away from each other and connected to the pier and the installed beam respectively. Then, the support columns of the two support components are controlled to move away from the sliding supports, and the main beam and guide beam are raised. At this time, the outriggers retract relative to the main beam and guide beam. The main beam and guide beam are then moved relative to the sliding supports so that the guide beam and main beam extend until the guide beam and main beam reach the pier where the beam has not been laid. Then, the main beam and guide beam are lowered, and the outriggers are fixedly connected to the top of the pier. At the same time, the sliding support on the side of the main beam facing the guide beam slides towards the pier, and the corresponding support column is connected to the pier, thus completing the stepping operation. During the forward movement of the main beam, beams or counterweights can also be hoisted by a crane to control the shift of the center of gravity and achieve a relatively stable stepping operation. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0030] Figure 2 This is a structural schematic diagram of the main beam and support components in Embodiment 1 of this application.

[0031] Figure 3 This is a schematic diagram of the support component in Embodiment 1 of this application.

[0032] Figure 4 This is a schematic diagram of the main beam, guide beam, and control components in Embodiment 2 of this application.

[0033] Figure 5 This is a schematic diagram of the control component, locking mechanism, and fastening component in Embodiment 2 of this application.

[0034] Figure 6 This is a cross-sectional structural diagram of the locking mechanism and fastening components in Embodiment 2 of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Main beam; 11. Locking rack; 12. Guide wheel; 2. Guide beam; 3. Hoisting trolley; 4. Outrigger; 5. Support assembly; 51. Support column; 52. Sliding component; 521. Sliding guide beam; 522. Sliding wheel; 523. Sliding support; 53. Locking component; 54. Sliding drive component; 6. Control assembly; 61. Control wheel; 62. Drive component; 63. Control cable; 631. Limit wheel; 64. Traction wheel; 7. Locking mechanism; 71. Locking pin; 72. Locking elastic component; 73. Traction cable; 731. Guide wheel; 74. Locking seat; 8. Fastening assembly; 81. Fastening seat; 811. Pin; 812. Fastening rod; 82. Wedge pin; 83. Fastening spring. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0037] This application discloses a bridge erecting machine for municipal bridges.

[0038] Example 1

[0039] Reference Figure 1 and Figure 2 The bridge erecting machine includes a main beam 1, a guide beam 2, and a hoisting trolley 3. Both the main beam 1 and the guide beam 2 are triangular truss structures. The guide beam 2 is lighter than the main beam 1, and its cross-sectional area is smaller than that of the main beam 1. The main beam 1 and the guide beam 2 are parallel to each other, and the guide beam 2 is bolted to the main beam 1. Two hoisting trolleys 3 are provided, and they are connected to the top crossbeam of the main beam 1 via wheel boxes for hoisting and transferring the beam segments.

[0040] Meanwhile, to support the main beam 1 and guide beam 2, both the main beam 1 and guide beam 2 are fixedly connected to at least one support leg 4 via pins and bolts. In this embodiment, two support legs 4 are provided at the end of the guide beam 2 away from the main beam 1, and the two support legs 4 are distributed along the width direction of the guide beam 2. The main beam 1 is provided with two sets of support legs 4 distributed along its length direction, each set containing two support legs 4 distributed along the width direction of the main beam 1. One set is located at the end of the main beam 1 away from the guide beam 2, and the remaining set is located in the middle of the main beam 1, so as to provide support for the main beam 1 and guide beam 2 when hoisting beam segments. The top of the support leg 4 is connected to the main beam 1 or guide beam 2 via a hydraulic lifting platform to achieve a lifting effect.

[0041] The main beam 1 is slidably provided with at least two support components 5. In this embodiment, the main beam 1 is slidably provided with two support components 5, and the two support components 5 are distributed along the length direction of the main beam 1.

[0042] Reference Figure 2 and Figure 3 Specifically, the support assembly 5 includes a support column 51 and a sliding member 52 disposed on the top of the support column 51. The support column 51 is slidably connected to the main beam 1 via the sliding member 52. The sliding member 52 includes a sliding guide beam 521, a sliding support 523, and several sliding wheels 522. The sliding guide beam 521 is a crossbeam at the bottom of the main beam 1. The top of the support column 51 is fixedly connected to the sliding support 523 via a hydraulic lifting platform to achieve height adjustment of the support column 51. The sliding wheels 522 are rotatably connected to the sliding support 523, and the plane of rotation of the sliding wheels 522 is parallel to the main beam 1.

[0043] Furthermore, several sliding wheels 522 are divided into two groups, with each group containing at least two sliding wheels 522, and the two groups of sliding wheels 522 are distributed vertically. The sliding guide beam 521 is clamped between the two groups of sliding wheels 522, so that the two groups of sliding wheels 522 are located on the upper and lower sides of the sliding guide beam 521 respectively, and the sliding wheels 522 are rolledly connected to the sliding guide beam 521, so as to realize the sliding connection between the support column 51 and the main beam 1, while also restricting the swing of the support column 51 relative to the main beam 1.

[0044] Reference Figure 2 and Figure 3 Meanwhile, in order to make the beam more stable during hoisting and transfer, the sliding support 523 is equipped with a locking element 53, so that the sliding support 523 slides and locks relative to the main beam 1 during the hoisting of the beam, and the sliding support 523 can still slide relative to the main beam 1 after the hoisting is completed.

[0045] The locking element 53 is a screw rod, which is fixedly connected to the sliding support 523 and the main beam 1 by a nut; or the locking element 53 passes through and is threadedly connected to the sliding support 523, and the locking element 53 is inserted into the main beam 1. In this embodiment, the locking element 53 has a U-shaped rod structure and is fastened to the crossbeam at the bottom of the main beam 1. The two ends of the locking element 53 pass through the sliding support 523 and are fastened by nuts to achieve sliding locking of the sliding support 523 relative to the main beam 1; and after the beam is hoisted, the locking element 53 can be removed from the sliding support 523.

[0046] Of course, in other embodiments, the locking element 53 may also be configured as a pin; or configured as a pin driven and controlled by an electric push cylinder or a hydraulic cylinder, wherein the electric push cylinder or hydraulic cylinder is disposed on the sliding support 523 and is used to control the pin to insert or abut against the main beam 1.

[0047] Reference Figure 2 and Figure 3Furthermore, the sliding support 523 is also provided with a sliding drive component 54 for driving the sliding wheel 522 to rotate. The sliding drive component 54 is a motor that drives at least one sliding wheel 522 to rotate through a chain drive mechanism. The chain drive mechanism is existing technology, which means that different sprockets are coaxially connected to the output shafts of the sliding wheel 522 and the sliding drive component 54, and the two sprockets are driven by a chain, which can realize the active sliding of the sliding support 523 without the need for additional power to drive the sliding.

[0048] The implementation principle of Example 1 is as follows: When transferring the bridge erecting machine, the two sliding supports 523 are first moved away from each other and connected to the pier and the installed beam respectively. Then, the support columns 51 of the two support components 5 are controlled to move away from the sliding supports 523 and the main beam 1 and guide beam 2 are raised. At this time, the outrigger 4 retracts relative to the main beam 1 and guide beam 2. The main beam 1 and guide beam 2 move relative to the sliding supports 523 so that the guide beam 2 and main beam 1 extend until the guide beam 2 and main beam 1 reach the pier where the beam has not been laid. Then, the main beam 1 and guide beam 2 are lowered. At this time, the outrigger 4 is fixedly connected to the top of the pier. At the same time, the sliding support 523 on the side of the main beam 1 facing the guide beam 2 slides towards the pier and the corresponding support column 51 is connected to the pier, thereby completing the stepping operation. During the forward movement of the main beam 1, the beam or counterweight can also be hoisted by the overhead crane 3 to control the offset of the center of gravity and achieve a relatively stable stepping operation.

[0049] Example 2

[0050] Reference Figure 4 and Figure 5 The difference between this embodiment and Embodiment 1 is that the guide beam 2 is slidably connected to the main beam 1. Specifically, multiple guide wheels 12 are respectively provided on the upper and lower sides of the crossbeam of the guide beam 2 truss. The guide beam 2 is rotatably connected to the main beam 1, which can limit the rotation of the guide beam 2 relative to the main beam 1, and at the same time effectively reduce the resistance of the guide beam 2 sliding relative to the main beam 1.

[0051] Meanwhile, a control assembly 6 is also provided on the main beam 1 to control the sliding of the guide beam 2 relative to the main beam 1. The control assembly 6 includes control wheels 61, a drive component 62, and a control cable 63. Two control wheels 61 are provided and are rotatably connected to the main beam 1. At the same time, a traction wheel 64 is rotatably connected to one end of the main beam 1 facing the guide beam 2. The two ends of the control cable 63 are respectively connected to the control wheels 61, and the control wheels 61 are used to wind up the control cable 63. The drive component 62 is provided on the main beam 1 and is used to drive the two control wheels 61 to rotate in different directions, and the control cable 63 is connected to the guide beam 2 through a fastening assembly 8.

[0052] When the bridge erecting machine needs to move forward after installing the bridge beams, the drive unit 62 controls the two control wheels 61 to rotate in opposite directions, and the fastening assembly 8 drives the guide beam 2 to move away from the main beam 1 until the guide beam 2 extends above the pier where no bridge beams have been installed, and the support leg 4 is connected to the pier. Then the main beam 1 slides relative to the support assembly 5 to achieve stable movement of the main beam 1 and optimize stability during use.

[0053] Reference Figure 4 and Figure 5 Meanwhile, in order to make the tension of the control cable 63 pulling the guide beam 2 relatively stable, limit wheels 631 are respectively provided on the opposite sides of the two ends of the control cable 63 connecting to the control wheel 61. The limit wheels 631 are rotatably connected to the main beam 1, and the two ends of the control cable 63 facing the control wheel 61 are respectively overlapped on the opposite side edges of the two limit wheels 631 before being connected to the control wheel 61, so that the direction of the tension of the control cable 63 pulling the guide beam 2 is relatively stable.

[0054] Furthermore, the drive component 62 is a motor, and the motor synchronously drives the two control wheels 61 to rotate in different directions through a transmission box with two output shafts, in order to control the extension and retraction of the guide beam 2. Of course, the drive component 62 can also be configured as two synchronous motors, with the output shafts of the two synchronous motors coaxially connected to the two control wheels 61 or connected to the two control wheels 61 through a chain drive mechanism.

[0055] Reference Figure 5 and Figure 6 Specifically, the fastening assembly 8 includes a fastening seat 81 and two wedge pins 82. Two parallel fastening rods 812 pass through the fastening seat 81, parallel to the sliding direction of the guide beam 2. Both ends of the fastening rods 812 are fixedly connected to the guide beam 2 by bolts. Simultaneously, two fastening springs 83 are sleeved on the fastening rods 812. The fastening seat 81 is clamped between the two fastening springs 83, with the ends of the two fastening springs 83 abutting against the guide beam 2 to limit the sliding of the fastening seat 81 and provide a cushioning effect.

[0056] Meanwhile, the fastening seat 81 has two opposing openings 811 formed on it, and the width of the opposing side opening edges of the two openings 811 is smaller than the width inside the opening 811. Wedge pins 82 are correspondingly engaged within the openings 811, with the small ends of the two wedge pins 82 facing each other to restrict their opposing movement. Furthermore, in order for the control cable 63 to pull the guide beam 2 in a timely manner, a portion of the control cable 63 is recessed and bent into the opening 811 and fitted onto the large end of the wedge pin 82. This ensures that the portion of the control cable 63 inside the opening 811 is wrapped around the large end of the wedge pin 82, so that when the control cable 63 moves towards the guide beam 2, it tends to pull the small end of the wedge pin 82 out of the opening 811. Since the wedge pin 82 is engaged in the pin opening 811, the greater the tension of the control cable 63, the greater the preload force applied by the wedge pin 82 to the control cable 63. This effectively secures the control cable 63 and, compared to using clamps or other clamping methods, effectively reduces the possibility of damage to the control cable 63. Finally, when the two control wheels 61 stop rotating, the fastening spring 83 acts as a buffer to reduce the impact force on the control cable 63.

[0057] Reference Figure 5 and Figure 6 Finally, to further enable the guide beam 2 to slide and lock relative to the main beam 1 in a timely manner, the main beam 1 is equipped with a locking mechanism 7. The locking mechanism 7 includes two locking pins 71 and locking elastic elements 72 disposed on the locking pins 71. One end of the two locking pins 71 is rotatably connected to the guide beam 2 through a locking seat 74, that is, the locking pins 71 are rotatably connected to the locking seat 74. The locking seat 74 is fixedly connected to the guide beam 2 by bolts. The other ends of the two locking pins 71 extend towards each other. Among them, a locking rack 11 is fixedly connected to the main beam 1. The locking rack 11 is parallel to the guide beam 2 and is located on the side of the locking pins 71 away from the connected control cable 63. The locking elastic element 72 is used to drive the swing section of the locking pins 71 to abut against the locking rack 11, so that the guide beam 2 can slide and lock relative to the main beam 1 in both directions.

[0058] Specifically, the locking elastic element 72 is a spring or a torsion spring, preferably a torsion spring. The two torsion arms of the locking elastic element 72 are respectively fixedly connected to the guide beam 2 and the locking pin 71, so that the swinging end of the locking pin 71 rotates towards the locking rack 11 and abuts against the locking rack 11. Simultaneously, a traction cable 73 is fixedly connected to the swinging section of the locking pin 71. The traction cable 73 is made of elastic material, and the two traction cables 73 are respectively fixedly connected to the control cable 63 via wire buckles. This allows the control cable 63 to pull the swinging ends of the two locking pins 71 away from the locking rack 11 when pulling the guide beam 2, thereby reducing interference with the sliding of the guide beam 2 relative to the main beam 1. At the same time, when the control cable 63 pulls the guide beam 2, due to the presence of a fastening spring 83, the locking pin 71 can promptly disengage from the locking rack 11 through the sliding of the fastening seat 81 relative to the guide beam 2.

[0059] Reference Figure 5 and Figure 6 Finally, in order to enable the control cable 63 to pull the locking pin 71 to swing in a timely manner, a guide wheel 731 is provided on the side of the two traction cables 73 that are far apart. The edges of the two traction cables 73 on the side that are far apart overlap the guide wheel 731 so that the angle when the traction cable 73 pulls the locking pin 71 to swing is relatively uniform.

[0060] The implementation principle of Example 2 is as follows: When the control cable 63 pulls the guide beam 2, the fastening seat 81 will first slide relative to the guide beam 2. At this time, the control cable 63 will pull the two locking pins 71 out of the locking rack 11 through the traction cable 73. After that, the fastening seat 81 will drive the guide beam 2 to move through the compressed fastening spring 83. When it is necessary to stop, the control cable 63 stops moving relative to the main beam 1, which will cause the compressed fastening spring 83 to extend. Then, the locking pins 71 will abut against the locking rack 11 under the action of the locking elastic element 72, so as to realize the sliding lock of the guide beam 2 against the main beam 1 and maintain the state of the guide beam 2 locked relative to the main beam 1.

[0061] 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 bridge erecting machine for municipal bridges, characterized in that: It includes a main beam (1), a guide beam (2) disposed on the main beam (1) and a hoisting trolley (3) for hoisting beam segments, wherein the hoisting trolley (3) is slidably disposed on the main beam (1); Both the main beam (1) and the guide beam (2) are provided with at least one support leg (4) for support, and the main beam (1) is slidably provided with at least two support components (5), the lower end of the support component (5) is used to connect to the pier or the installed beam; and the support ends of the support leg (4) and the support component (5) can be raised and lowered; The main beam (1) is provided with a control assembly (6) for controlling the sliding of the guide beam (2). The control assembly (6) includes two control wheels (61) rotatably connected to the main beam (1), a drive member (62) for driving the two control wheels (61) to rotate in opposite directions, and a control cable (63). The two ends of the control cable (63) are respectively connected to the two control wheels (61). The main beam (1) is rotatably connected to a traction wheel (64). The control cable (63) is wound around the traction wheel (64), and the guide beam (2) is fixedly connected to the part of the control cable (63) located between the traction wheel (64) and the control wheel (61). The main beam (1) is provided with a locking mechanism (7), which includes two locking pins (71) rotatably connected to the guide beam (2) and a locking elastic member (72) provided on the locking pins (71). The swing ends of the two locking pins (71) are located on opposite sides of the ends connected to the guide beam (2). The main beam (1) is provided with a locking rack (11) for abutting against the ends of the locking pins (71). The locking elastic member (72) is used to drive the locking pins (71) to abut against the locking rack (11). The two locking pins (71) are connected to a traction cable (73) fixed to the control cable (63). The traction cable (73) is used to pull the locking pins (71) away from the locking rack (11) when the control cable (63) pulls the guide beam (2). A guide wheel (731) is provided on the side of the two traction cables (73) that are far apart, and the edge of the side of the two traction cables (73) that are far apart is wrapped around and overlapped with the guide wheel (731). The locking elastic element (72) is a torsion spring, and the two torsion arms of the locking elastic element (72) are fixed to the guide beam (2) and the locking pin (71) respectively.

2. The bridge erecting machine for municipal bridges according to claim 1, characterized in that: The support assembly (5) includes a height-adjustable support column (51) and a sliding member (52) disposed on the top of the support column (51). The sliding member (52) includes a sliding guide beam (521) and a plurality of sliding wheels (522) rotatably connected to the support column (51). The sliding guide beam (521) is fixedly connected to the main beam (1). The plurality of sliding wheels (522) are divided into two groups and the two groups are located on the upper and lower sides of the sliding guide beam (521) respectively. The sliding wheels (522) in the same group contain at least two of each group. The sliding guide beam (521) is clamped between the two groups of sliding wheels (522).

3. A bridge erecting machine for municipal bridges according to claim 2, characterized in that: The sliding wheel (522) is rotatably connected to the support column (51) via the sliding support (523), and the sliding support (523) is provided with a locking element (53) for detachably connecting the main beam (1).

4. A bridge erecting machine for municipal bridges according to claim 3, characterized in that: The locking member (53) is a screw rod that passes through the sliding support (523). The locking member (53) is used for threaded connection or fastening of the main beam (1).

5. A bridge erecting machine for municipal bridges according to claim 1, characterized in that: The control cable (63) is connected to the guide beam (2) by a fastening assembly (8). The fastening assembly (8) includes a fastening seat (81) and two wedge pins (82) disposed on the guide beam (2). The fastening seat (81) is formed with two opposing openings (811) and the width of the opposing opening edges is smaller than the width inside the openings (811). The wedge pins (82) are correspondingly locked in the openings (811). A portion of the control cable (63) is recessed from the small end of the opening (811) into the opening (811), and the portion of the control cable (63) located inside the opening (811) is wound around the large end of the two wedge pins (82).

6. A bridge erecting machine for municipal bridges according to claim 5, characterized in that: The fastening seat (81) is slidably connected to the guide beam (2), and fastening springs (83) are respectively provided at both ends of the fastening seat (81) along the sliding direction. The end of the fastening spring (83) away from the fastening seat (81) is connected to the guide beam (2).

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