Integral unloading device for cast-in-place box girder steel pipe bailey beam support

Abstract

The invention relates to the field of bridge construction equipment, in particular to a cast-in-place box girder steel pipe bailey beam support integral unloading device which comprises a jack arranged on a box girder, a supporting beam arranged on the lower side of a bailey beam, a steel strand used for connecting the jack and the supporting beam, and a traction mechanism comprising an unwinding unit, a traction rope, a winding roller and a winding unit. The unwinding unit is arranged on the supporting beam and consists of an unwinding shaft and a first driving part; and the winding unit is arranged on the ground and consists of a winding shaft and a second driving part. According to the device, through orderly unwinding and winding of the traction rope, overall stable unloading of the bailey beam support is achieved, the construction efficiency is effectively improved, and the safety risk is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of X, and in particular to an integral unloading device for a cast-in-place box girder steel tube Bailey beam support. Background Art

[0002] Cast-in-place box girders are widely used in bridge construction, especially in large-span bridge projects. The traditional cast-in-place box girder construction method usually uses Bailey beams as the bottom support, builds the construction platform and pours the formwork. Bailey beams have become an important tool for on-site construction due to their lightness and easy assembly. However, after the construction is completed, how to safely and efficiently unload the Bailey beam from the construction site and transport it to the designated location has always been a major problem in the construction process.

[0003] At present, the removal of Bailey beams usually requires disassembly, disassembly of the Bailey beams into several units, and lifting them one by one. However, there are problems such as long disassembly period, low safety factor, large number of mechanical equipment occupied, and high cost.

[0004] In order to solve the above problems, the utility model patent with announcement number CN214783337U specifically discloses a cast-in-place box beam steel tube Bailey beam support integral unloading device, which adopts a supporting beam, steel strands fixedly connected to different positions in the length direction of the supporting beam, a jack connecting the steel strands, a control component for controlling the jack, and a connecting line connected between the jack and the control component. The supporting beam supports the Bailey beam, one end of the steel strand is connected to the supporting beam, and the other end is connected to the jack, and the jack is arranged on the box beam and controls the lowering of the steel strand, thereby realizing the integral lifting and unloading of the Bailey beam.

[0005] However, since the Bailey beam needs to be transported by a transport vehicle, in order to improve the transportation efficiency, the Bailey beam needs to be accurately suspended on the carriage of the transport vehicle. As the Bailey beam descends, the length of the steel strand gradually increases, and the supporting beam and the Bailey beam are more susceptible to swing due to external environmental factors. At the same time, since the supporting beam and the Bailey beam are large in size and heavy in weight, it will have an adverse effect on the efficiency and safety of loading and unloading. Summary of the invention

[0006] The present application provides a cast-in-place box girder steel tube Bailey beam support integral unloading device, which adopts the following technical solution: An integral unloading device for a cast-in-place box girder steel tube Bailey beam support comprises a jack arranged on the box girder, a supporting beam arranged on the lower side of the Bailey beam, and a steel strand for connecting the jack and the supporting beam; It also includes a traction mechanism, which includes an unwinding unit, a traction rope, a winding roller and a rewinding unit; the unwinding unit is arranged on the supporting beam, and the unwinding unit includes an unwinding shaft rotatably arranged on the supporting beam and a first driving component that drives the unwinding shaft to rotate; The winding device is arranged on the ground and includes a winding shaft and a second driving component for driving the winding shaft to rotate; two winding rollers are provided, one of which is connected to the unwinding shaft and the other is connected to the winding shaft; a connecting plate is also fixed on the unwinding shaft, and the traction rope is connected to the connecting plate.

[0007] By adopting the above technical solution, the jack drives the supporting beam and the Bailey beam to fall synchronously through the steel strands. Before that, the traction rope is rolled up on the winding roller on the unwinding device, and the unwinding device lowers the traction rope to the ground. While the supporting beam and the Bailey beam are descending, the winding device winds up the traction rope to maintain the traction force of the traction rope on the supporting beam, thereby improving the stability of the supporting beam when it falls, reducing the impact of external environmental factors on the supporting beam, and thus improving the stability and safety of the Bailey beam unloading.

[0008] Preferably, a bearing plate is provided on the supporting beam, a matching hole is opened on the bearing plate, and the connecting plate is rotatably connected to the matching hole.

[0009] By adopting the above technical solution, the traction force of the traction rope is directly transmitted to the supporting beam through the bearing plate, which can effectively improve the traction effect on the supporting beam and ensure stability.

[0010] Preferably, a locking cap is provided at the end of the traction rope, and the locking cap is sleeved on the end of the traction rope; a connecting groove is provided on the connecting plate, and the locking cap is plugged into and matched with the fixing groove to achieve a detachable connection.

[0011] By adopting the above technical solution, the convenience of connecting the traction rope and the connecting plate can be improved through the plug-in cooperation of the locking cap and the fixing groove, while ensuring the stability of the connection.

[0012] Preferably, the unwinding unit also includes a guide plate, which is fixed on the supporting beam and extends to one side of the unwinding shaft, and a guide hole is provided on the guide plate, and the traction rope passes through the guide hole; a locking block is provided on the locking cap, and a through groove corresponding to the locking block is provided on the inner wall of the guide hole for the locking block to pass through the guide plate.

[0013] By adopting the above technical solution, the traction rope passes through the guide plate, which helps to achieve smooth unwinding of the traction rope and avoids the situation where the traction rope is repeatedly wound on the unwinding roller and cannot be unwound smoothly. In addition, the stability of the traction rope end when it is not unwound can be ensured by the cooperation between the lock cap and the guide hole, ensuring smooth unwinding.

[0014] Preferably, the unwinding unit also includes an auxiliary unwinding component, which includes two output rollers arranged in parallel, and the output rollers are rotatably arranged on a supporting beam and located on one side of the unwinding shaft; the output rollers are connected to the unwinding shaft through a gear transmission; the traction rope passes between the two output rollers, and the two output rollers clamp the traction rope and realize auxiliary unwinding of the traction rope by rotation.

[0015] By adopting the above technical solution, the traction rope can be smoothly lowered to the ground through the auxiliary unwinding of the two output rollers, avoiding the problem that the traction rope cannot be unwound.

[0016] Preferably, it further comprises a guide rod, one end of which is located at the supporting beam, and the other end of which is located at the ground; a slip ring is provided on the guide rod, and the traction rope is detachably connected to the slip ring.

[0017] By adopting the above technical solution, the guide rod can play a better guiding role for the traction rope, avoid the influence of external environmental factors, and improve the accuracy of lowering the traction rope.

[0018] Preferably, the winding roller is detachably connected to the unwinding shaft, and the winding roller is detachably connected to the reeling shaft.

[0019] By adopting the above technical solution, the two winding rollers are detachably connected to the unwinding shaft and the reeling shaft. Therefore, it is only necessary to replace the winding roller on the unwinding device and the winding roller on the reeling device to reset the traction rope for the next use, which helps to improve work efficiency.

[0020] Preferably, the unwinding shaft and the reeling shaft both include an active shaft segment and a passive shaft segment; the active shaft segment and the passive shaft segment are both rotatably connected to the supporting beam, the winding roller is located between the active shaft segment and the passive shaft segment, and one end of the winding roller is connected to the active shaft segment, and the other end is connected to the passive shaft segment.

[0021] By adopting the above technical solution, the active shaft section is used to drive the winding roller, while the passive shaft section can improve the stability of the winding roller. Therefore, by adopting the coordinated work of the active shaft section and the passive shaft section, the normal operation of the winding roller is achieved, and the reel-in roller is made detachable.

[0022] Preferably, it also includes an auxiliary bracket, which is used to be fixedly connected to the ground or to the box beam pier; the winding device is connected to the auxiliary bracket.

[0023] By adopting the above technical solution, the auxiliary bracket can effectively improve the stability of the winding device, and by being fixedly connected to the ground or the box beam pier, it can provide a stable traction force to assist the smooth unloading of the Bailey beam and the supporting beam.

[0024] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The jack drives the supporting beam and Bailey beam to fall synchronously through the steel strands, and the traction rope maintains the traction force on the supporting beam through the winding device, which improves the stability of the supporting beam when it falls, reduces the impact of external environmental factors on the supporting beam, and improves the safety and reliability of Bailey beam unloading; in addition, by using multiple sets of traction mechanisms, distributed on both sides of the transport vehicle, the Bailey beam can be accurately positioned, effectively improving the loading efficiency; 2. The locking cap and guide plate are used to guide and fix the traction rope, thereby improving the working stability of the traction mechanism; the connecting plate is used to transmit the traction force of the traction rope to the supporting beam, thereby improving the stability of the traction process; 3. The guide plate and auxiliary unwinding assembly in the unwinding unit ensure the smooth unwinding of the traction rope, avoid the jamming problem caused by repeated winding of the traction rope, and improve the smoothness and efficiency of the unloading process; the two parallel output rollers in the unwinding unit clamp the traction rope and realize auxiliary unwinding by rotating. This not only ensures that the traction rope can be smoothly lowered to the ground, but also avoids the problems caused by the inability to unwind the traction rope smoothly, further improving the stability and reliability of the entire unloading process; 4. The winding roller is detachably connected with the unwinding shaft and the reeling shaft, so that after completing an unloading operation, the working state of the traction rope can be quickly restored by simply replacing the winding roller on the unwinding device and the winding roller on the reeling device, which simplifies the maintenance and replacement process, reduces the operation difficulty and cost, and significantly improves the operation efficiency of the equipment; 5. The present application also uses an auxiliary bracket, which can effectively improve the stability of the winding device, and through a fixed connection with the ground or the box beam pier, provide a stable traction force to assist the smooth unloading of the Bailey beam and the supporting beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the cast-in-place box girder steel tube Bailey beam support integral unloading device in the embodiment of the present application; Figure 2 yes Figure 1 The partial enlarged view of part A in the middle is used to show the structure of the unwinding device; Figure 3 It is a structural schematic diagram of an unwinding unit in an embodiment of the present application; Figure 4 yes Figure 3 The partially enlarged schematic diagram of part B in the middle is used to show the matching relationship between the traction rope, the locking cap, the locking block and the guide plate; Figure 5 is a schematic diagram of the structure of the guide hole in the embodiment of the present application; Figure 6It is a structural schematic diagram of the winding unit in the embodiment of the present application.

[0026] Markings in the attached drawings: 1. box beam; 2. jack; 3. Bailey beam; 4. supporting beam; 41. load-bearing plate; 5. steel strand; 6. traction mechanism; 61. unwinding unit; 611. unwinding shaft; 612. first driving component; 613. connecting plate; 614. guide plate; 615. output roller; 62. traction rope; 621. locking cap; 622. locking block; 63. winding unit; 631. winding shaft; 632. second driving component; 64. winding roller; 7. guide rod; 71. slip ring; 8. auxiliary bracket. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-6 The present invention is described in further detail.

[0028] The inventors of the present application found that when the Bailey beam 3 is unloaded as a whole, as the Bailey beam 3 descends, the length of the steel strand 5 gradually increases, and it is more susceptible to swinging due to external environmental factors, thereby adversely affecting the efficiency and safety of the loading and unloading process.

[0029] For this purpose, refer to Figure 1 The present application provides a device for unloading an integral cast-in-place box girder steel tube Bailey beam support, which specifically includes a jack 2 arranged on the box girder 1, a supporting beam 4 arranged on the lower side of the Bailey beam 3, and a steel strand 5 for connecting the jack 2 and the supporting beam 4, and a traction mechanism 6 for pulling the lowering of the supporting beam 4. The jack 2 is installed at a suitable position of the box girder 1 and is driven by a hydraulic system to gradually press down the Bailey beam 3. The supporting beam 4 is arranged on the lower side of the Bailey beam 3 to support the Bailey beam 3. The steel strand 5 is used to connect the jack 2 and the supporting beam 4, and through the downward pressing action of the jack 2, the supporting beam 4 and the Bailey beam 3 are driven to descend synchronously. The main function of the traction mechanism 6 is to maintain the stability of the supporting beam 4 through the tension of the traction rope 62 during the descent of the Bailey beam 3, reduce the influence of external environmental factors (such as wind force) on the Bailey beam 3, and improve the safety and efficiency of unloading.

[0030] Reference Figure 1 and Figure 2Specifically, the traction mechanism 6 includes an unwinding unit 61, a traction rope 62, a winding roller 64 and a rewinding unit 63; the unwinding unit 61 is arranged on the supporting beam 4, and the unwinding unit 61 includes an unwinding shaft 611 rotatably arranged on the supporting beam 4 and a first driving component 612 driving the unwinding shaft 611 to rotate. The rewinding device is arranged on the ground, and includes a rewinding shaft 631 and a second driving component 632 driving the rewinding shaft 631 to rotate. Two rewinding rollers 64 are provided, one of which is connected to the unwinding shaft 611, and the other is connected to the rewinding shaft 631; a connecting plate 613 is also fixed on the unwinding shaft 611, and the traction rope 62 is connected to the connecting plate 613, so as to ensure that the traction rope 62 can reliably follow the rotation of the unwinding shaft 611 and be released.

[0031] The jack 2 drives the supporting beam 4 and the Bailey beam 3 to fall synchronously through the steel strand 5. Before that, the traction rope 62 is rolled up on the winding roller 64 located on the unwinding device, and the unwinding device lowers the traction rope 62 to the ground. While the supporting beam 4 and the Bailey beam 3 are descending, the winding device winds up the traction rope 62 to maintain the traction force of the traction rope 62 on the supporting beam 4, thereby improving the stability of the supporting beam 4 when falling, reducing the influence of external environmental factors on the supporting beam 4, and thus improving the stability and safety of the Bailey beam 3 when unloading.

[0032] The reel shaft 631 is rotatably arranged on a fixed frame on the ground through a bearing to fix the reel unit 63. The second driving component 632 can also be an electric motor or a pneumatic motor, which is used to drive the reel shaft 631 to rotate and reel in the traction rope 62. One of the winding rollers 64 is connected to the unwinding shaft 611, and the other is connected to the reel shaft 631, ensuring that the traction rope 62 is smooth and unobstructed during the unwinding and rewinding process.

[0033] When the jack 2 drives the supporting beam 4 and the Bailey beam 3 to fall synchronously through the steel strand 5, the traction rope 62 is released from the unwinding unit 61 and reaches the reeling unit 63 on the ground through the guidance of the winding roller 64. The reeling unit 63 drives the reeling shaft 631 to rotate through the second driving component 632, reels the traction rope 62, and maintains the continuous traction force of the traction rope 62 on the supporting beam 4, thereby improving the stability of the supporting beam 4 when falling, reducing the influence of external environmental factors, and improving the stability and safety of the unloading of the Bailey beam 3.

[0034] Reference Figure 2 and Figure 3 In order to facilitate the installation and disassembly of the winding roller 64, the unwinding shaft 611 and the reeling shaft 631 in the present application both include an active shaft section and a passive shaft section, and the winding roller 64 is located between the active shaft section and the passive shaft section, and one end of the winding roller 64 is connected to the active shaft section, and the other end is connected to the passive shaft section. The connection between the active shaft section and the passive shaft section and the winding roller 64 can be made by flange bolts or couplings to ensure the convenience of assembly and disassembly.

[0035] Further, a bearing plate 41 is provided on the supporting beam 4, and a matching hole is provided on the bearing plate 41, and the connecting plate 613 is rotatably connected to the matching hole. The bearing plate 41 is used to bear the tension from the traction rope 62 and evenly distribute it to the supporting beam 4, thereby enhancing the bearing capacity of the supporting beam 4. The connecting plate 613 is rotatably connected to the matching hole to ensure that the connecting plate 613 can flexibly rotate during the unwinding and rewinding process of the traction rope 62, thereby reducing friction and wear and extending the service life.

[0036] The pulling force of the traction rope 62 is directly transmitted to the supporting beam 4 through the bearing plate 41, which can more effectively improve the traction effect on the supporting beam 4 and ensure the stability of the supporting beam 4 during the descent process. In addition, the rotation connection design of the connecting plate 613 and the matching hole makes the whole system more flexible and adaptable to various complex working environments.

[0037] Reference Figure 3 Furthermore, a locking cap 621 is provided at the end of the traction rope 62, and the locking cap 621 is sleeved on the end of the traction rope 62; a connecting groove is provided on the connecting plate 613, and the locking cap 621 is plugged into the connecting groove to achieve a detachable connection. In the unloading process, if the traction rope 62 needs to be replaced or repaired, it can be quickly disassembled and reinstalled, which improves the maintenance convenience of the system. At the same time, it also ensures the reliability of the connection. In a complex construction environment, this quick connection and separation design can significantly improve work efficiency and reduce downtime.

[0038] Reference Figure 3 , Figure 4 and Figure 5 The unwinding unit 61 further includes a guide plate 614, which is fixedly arranged on the supporting beam 4 and extends to one side of the unwinding shaft 611. A guide hole is provided on the guide plate 614, and the traction rope 62 passes through the guide hole; a locking block 622 is provided on the locking cap 621, and a through groove corresponding to the locking block 622 is provided on the inner wall of the guide hole for the locking block 622 to pass through the guide plate 614. By adding the guide plate 614, on the one hand, it is helpful to realize the smooth unwinding of the traction rope 62, and avoid the situation that the traction rope 62 is repeatedly wound on the unwinding roller and cannot be unwound smoothly. On the other hand, the traction rope 62 can be tightened by the winding roller. At this time, under the action of the guide plate 614, the locking cap 621 and the locking block 622 can limit the end of the traction rope 62, and avoid the end of the traction rope 62 winding on the winding roller 64, so as to facilitate the smooth lowering of the subsequent traction rope 62.

[0039] In addition, the matching design of the locking block 622 and the guide hole can ensure the stability of the end of the traction rope 62 when it is not unwound, and prevent the traction rope 62 from accidentally falling off during the unwinding process.

[0040] Reference Figure 3Furthermore, the unwinding unit 61 also includes an auxiliary unwinding component, which includes two output rollers 615 arranged in parallel, and the output rollers 615 are rotatably arranged on the supporting beam 4 and located on one side of the unwinding shaft 611; the output rollers 615 are connected to the unwinding shaft 611 through a gear transmission to ensure that when the unwinding shaft 611 rotates, the output rollers 615 also rotate accordingly. The traction rope 62 passes through the two output rollers 615, and the two output rollers 615 clamp the traction rope 62 and realize the auxiliary unwinding of the traction rope 62 by rotating. Through the auxiliary unwinding function of the two output rollers 615, the traction rope 62 can be effectively prevented from getting stuck and entangled during the unwinding process, ensuring that the traction rope 62 is smoothly lowered to the ground. In addition, the design of the gear transmission connection makes the linkage between the unwinding shaft 611 and the output rollers 615 tighter, thereby improving the stability and reliability of the system.

[0041] In the present application, in order to make the guide plate 614 and the auxiliary unwinding assembly cooperate with each other to improve the stability of the traction rope 62, the auxiliary unwinding assembly is arranged below the unwinding shaft 611, and the guide plate 614 is arranged below the auxiliary unwinding assembly. The traction rope 62 passes through the auxiliary unwinding assembly and the guide plate 614 in sequence. The auxiliary unwinding assembly can lower the traction rope 62, and the guide plate 614 can guide the traction rope 62, reducing the traction rope 62 from getting stuck or being repeatedly wound in the auxiliary unwinding assembly.

[0042] Reference Figure 1 and Figure 3 In order to prevent the traction rope 62 from being affected by external factors such as wind when being lowered, the present application further adds a guide rod 7. The guide rod 7 is vertically arranged, and a slip ring 71 is arranged on the guide rod 7. The traction rope 62 is detachably connected to the slip ring 71, thereby guiding the traction rope 62. Preferably, the guide rod 7 can also be set as a telescopic rod for easy installation or recovery.

[0043] Reference Figure 6 , in order to ensure that the traction mechanism 6 has sufficient traction and stability. The present application further adds an auxiliary bracket 8. The auxiliary bracket 8 is used to be fixedly connected to the ground or to the pier of the box beam 1. The fixed frame with the winding unit 63 is fixedly connected to the auxiliary bracket 8. The auxiliary bracket 8 is detachable, which helps to improve construction efficiency and reduce construction costs.

[0044] In addition, in order to further improve the stability of the supporting beam 4 and the Bailey beam 3 during the overall descent process, multiple groups of traction mechanisms 6 can be provided, and they are respectively connected to the supporting beam 4 at different positions to ensure the uniformity of the force on the supporting beam 4.

[0045] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cast-in-place box girder steel tube Bailey beam support integral unloading device, comprising a jack (2) arranged on the box girder (1), a supporting beam (4) arranged on the lower side of the Bailey beam (3), and a steel strand (5) for connecting the jack (2) and the supporting beam (4); Features: It also comprises a traction mechanism (6), the traction mechanism (6) comprising an unwinding unit (61), a traction rope (62), a winding roller (64) and a rewinding unit (63); the unwinding unit (61) is arranged on the supporting beam (4), the unwinding unit (61) comprises an unwinding shaft (611) rotatably arranged on the supporting beam (4) and a first driving component (612) driving the unwinding shaft (611) to rotate; The winding device is arranged on the ground and comprises a winding shaft (631) and a second driving component (632) for driving the winding shaft (631) to rotate; two winding rollers (64) are provided, one of which is connected to the unwinding shaft (611) and the other is connected to the winding shaft (631); a connecting plate (613) is also fixed on the unwinding shaft (611), and the traction rope (62) is connected to the connecting plate (613).

2. The integral unloading device for the cast-in-place box beam steel tube Bailey beam support according to claim 1 is characterized in that: A load-bearing plate (41) is provided on the supporting beam (4), a matching hole is provided on the load-bearing plate (41), and the connecting plate (613) is rotatably connected to the matching hole.

3. The integral unloading device for the cast-in-place box girder steel tube Bailey beam support according to claim 1 or 2, characterized in that: The end of the traction rope (62) is provided with a locking cap (621), and the locking cap (621) is sleeved on the end of the traction rope (62); the connection plate (613) has a connecting groove, and the locking cap (621) is plugged into and matched with the fixing groove to achieve a detachable connection.

4. The integral unloading device for the cast-in-place box beam steel tube Bailey beam support according to claim 3 is characterized in that: The unwinding unit (61) further comprises a guide plate (614), wherein the guide plate (614) is fixedly arranged on the supporting beam (4) and extends to one side of the unwinding shaft (611); a guide hole is provided on the guide plate (614), and the traction rope (62) passes through the guide hole; a locking block (622) is provided on the locking cap (621), and a through groove corresponding to the locking block (622) is provided on the inner wall of the guide hole so that the locking block (622) can pass through the guide plate (614).

5. The integral unloading device for the cast-in-place box beam steel tube Bailey beam support according to claim 1 is characterized in that: The unwinding unit (61) further comprises an auxiliary unwinding component, the auxiliary component comprising two output rollers (615) arranged in parallel, the output rollers (615) being rotatably arranged on a supporting beam (4) and located on one side of the unwinding shaft (611); the output rollers (615) are connected to the unwinding shaft (611) via a gear transmission; the traction rope (62) passes between the two output rollers (615), the two output rollers (615) clamp the traction rope (62), and realize auxiliary unwinding of the traction rope (62) by rotating.

6. The integral unloading device for the cast-in-place box beam steel tube Bailey beam support according to claim 1 is characterized in that: It also comprises a guide rod (7), one end of the guide rod (7) being located at the supporting beam (4) and the other end being located at the ground; a slip ring (71) is provided on the guide rod (7), and the traction rope (62) is detachably connected to the slip ring (71).

7. The integral unloading device for the cast-in-place box beam steel tube Bailey beam support according to claim 1 is characterized in that: The winding roller (64) is detachably connected to the unwinding shaft (611), and the winding roller (64) is detachably connected to the winding roller.

8. The integral unloading device for the cast-in-place box beam steel tube Bailey beam support according to claim 7 is characterized in that: The unwinding shaft (611) and the rewinding shaft (631) both comprise a driving shaft section and a passive shaft section; the driving shaft section and the passive shaft section are both rotatably connected to the supporting beam (4); the winding roller (64) is located between the driving shaft section and the passive shaft section; one end of the winding roller (64) is connected to the driving shaft section, and the other end is connected to the passive shaft section.

9. The integral unloading device for the cast-in-place box beam steel tube Bailey beam support according to claim 8 is characterized in that: It also comprises an auxiliary bracket (8), the auxiliary bracket (8) being used for being fixedly connected to the ground or to a pier of the box beam (1); the winding device is connected to the auxiliary bracket (8).

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