Bridge steel box girder hoisting device and hoisting construction method thereof

Abstract

The application relates to the technical field of hoisting equipment, in particular to a bridge steel box girder hoisting device and a hoisting construction method thereof. The bridge steel box girder hoisting device comprises a lifting ring and lifting ropes, the lifting ropes are provided with multiple ropes, the top of each of the ropes is connected with the lifting ring, the other end of each of the ropes is provided with a side clamping plate, a fixing unit is arranged on the side clamping plate, a combined extension unit is arranged on the side clamping plate close to the side of the installed steel box girder, a moving unit is arranged on the rest of the side clamping plates, and a detection piece is further arranged on any one of the side clamping plates. The combined extension unit is arranged on the side clamping plate close to the side of the installed steel box girder, when the steel box girder is hoisted to the installation position, the combined extension unit can be extended and clamped with the installed steel box girder, the hoisted steel box girder is butt-jointed and installed with the installed steel box girder, the manual measurement and supporting in the traditional hoisting are avoided, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting equipment, in particular to a bridge steel box girder hoisting device and a hoisting construction method thereof. BACKGROUND

[0002] Steel box girder, also known as steel plate box girder, is a common structure form of long-span bridge, which is generally used in bridges with large span. It is called steel box girder because its outer shape looks like a box. Steel box girder is generally connected by full welding of top plate, bottom plate, web plate, transverse diaphragm, longitudinal diaphragm and stiffening rib, etc.

[0003] When installing two adjacent steel box girders, the construction personnel fix one of the steel box girders, then hoist the other steel box girder in the air by a crane, and then manually align the hoisted steel box girder with the fixed steel box girder, and finally weld the connection between the two steel box girders. However, during the construction process, manual operation is required to align the hoisted steel box girder with the fixed steel box girder, and measurement personnel are required to cooperate with observation. The butt joint may not be accurate enough, which is quite troublesome and also poses a safety hazard.

[0004] To solve the above problems, Chinese patent CN116986463B proposes a steel box girder hoisting device for hoisting and positioning during installation of two adjacent steel box girders, which includes two groups of symmetrically arranged hoisting modules. The two groups of hoisting modules are movably connected by a connecting assembly. Each hoisting module includes a supporting assembly, an adjusting assembly and a clamping assembly. The supporting assembly includes a supporting seat and a hoisting frame. The hoisting frame is fixedly arranged on the upper end of the supporting seat. The connecting assembly is arranged between the two hoisting frames. One end of the supporting seat is provided with an adjusting assembly at the lower part. The clamping assembly is provided with two groups. One group is rotatably arranged at the lower end of the adjusting assembly, and the other group is fixedly arranged at the lower part of the other end of the supporting seat. The clamping assembly is clamped at the end of the steel box girder. The adjusting assembly provided in the prior art can realize accurate butt joint of the steel box girder to be installed with the fixed steel box girder by matching with the control assembly.

[0005] Although the above-mentioned patent can realize butt joint during hoisting and installation of the steel box girder, it contains multiple precise components such as the adjusting assembly, the clamping assembly and the control assembly, and also contains some lead screws and worm gear transmissions. The number of components is large and the linkage relationship is complex. The complex design of these components increases the manufacturing difficulty and maintenance cost of the equipment. In addition, since the steel box girder is generally heavy, with a weight of up to hundreds of tons, these linkage designs may cause connection loosening due to mechanical fatigue or material creep under some heavy load working conditions, affecting the overall structural rigidity and the safety of hoisting.

[0006] Therefore, we propose a bridge steel box girder hoisting device and a hoisting construction method thereof. SUMMARY

[0007] To solve the above technical problems, the embodiment of the present application provides a bridge steel box girder hoisting device, which comprises a lifting ring and a lifting cable, the lifting cable is provided with multiple lifting cables, the top of each lifting cable is connected with the lifting ring, the other end of each lifting cable is provided with a side clamping plate, a fixing unit is arranged on the side clamping plate, a combined extension unit is arranged on the side clamping plate close to the side of the installed steel box girder, a moving unit is arranged on the remaining side clamping plates, and a detection piece is further arranged on any one of the side clamping plates.

[0008] In some embodiments, the side clamping plate is in the shape of U as a whole, the inner side opening of the side clamping plate is matched with the outer side of the steel box girder, the fixing unit comprises multiple fixing oil cylinders arranged on the upper and lower sides of the side clamping plate, the output end of each fixing oil cylinder is provided with a fastening plate, and an avoiding hole is formed in the side clamping plate for the fastening plate to pass through.

[0009] In some embodiments, a flange is arranged on the outer side of the fixing oil cylinder, an installation support is arranged on the side clamping plate through a bolt, and the fixing oil cylinder is bolted to the installation support through the flange.

[0010] In some embodiments, the combined extension unit is composed of a side plate one, an intermediate plate and a side plate two, the side plate one, the intermediate plate and the side plate two are combined to form a U-shaped structure consistent with the shape of the side clamping plate, the side plate one is internally provided with an extension oil cylinder one, the output end of the extension oil cylinder one is fixedly connected with the intermediate plate, the bottom of the intermediate plate is provided with an extension oil cylinder two, the output end of the extension oil cylinder two is fixedly connected with the side plate two, a butt joint oil cylinder is fixedly arranged on the side clamping plate, and the output end of the butt joint oil cylinder is fixedly connected with the side plate one.

[0011] In some embodiments, a roller is rotatably arranged on the side clamping plate, the bottom end of the lifting cable is wound on the roller, a rotating shaft is arranged in the middle of the roller, a driving motor is fixedly arranged on the side clamping plate, a reducer is connected to the output end of the driving motor, and the output end of the reducer is in transmission connection with the rotating shaft on the roller.

[0012] In some embodiments, the detection piece is a horizontal sensor.

[0013] In some embodiments, a through groove is formed in the back side of the side clamping plate, the moving unit comprises two transmission shafts rotatably arranged on the two sides of the through groove, walking wheels are arranged on the outer sides of the transmission shafts, belts are arranged on the outer sides of the transmission shafts, the two transmission shafts are synchronously driven through the belts, a worm wheel is arranged on the outer side of one of the transmission shafts, a reduction motor is fixedly arranged on the back side of the side clamping plate, and a worm is arranged on the output end of the reduction motor and in transmission engagement with the worm wheel.

[0014] In some embodiments, a plurality of rolling balls are movably arranged on the inner bottom surface of the side clamping plate.

[0015] In some embodiments, a buffer pad is arranged outside the side clamping plate.

[0016] The present application provides a hoisting construction method of a bridge steel box girder hoisting device, comprising the following steps:

[0017] S1: the side clamping plate is clamped outside the steel box girder, the side clamping plate is moved by the moving motor to drive the walking wheel to balance the hoisting, and the fastening plate is clamped to the steel box girder by the fixed oil cylinder;

[0018] S2: the steel box girder is hoisted for trial, the hoisting height is less than 200mm, and the mechanical properties of the crane are observed;

[0019] S3: the steel box girder is slowly hoisted and transported to the installation position, and the cable wind rope is used for traction during the period to prevent the steel box girder from rotating horizontally;

[0020] S4: after being transported to the installation position, the steel box girder is butt jointed with the already installed steel box girder by the combined extension unit, and then the installation is completed.

[0021] The present application has at least the following beneficial effects:

[0022] 1. The combined extension unit is arranged on the side clamping plate close to the installed steel box girder, and when the steel box girder is transported to the installation position, the combined extension unit can be extended and clamped with the installed steel box girder, thereby assisting the butt joint installation of the transported steel box girder and the installed steel box girder, avoiding the manual measurement and support multiple times in the traditional hoisting, and improving the installation efficiency;

[0023] 2. The fixed unit adopts the fixed oil cylinder and the fastening plate, the side clamping plate is in a U shape and the inner side opening is matched with the outer side of the steel box girder, the fixed oil cylinder is arranged on the upper and lower sides of the side clamping plate, the output end is provided with the fastening plate, the fastening plate is abutted to the surface of the steel box girder through the avoiding hole, the upper and lower sides of the steel box girder are clamped in a wrapping mode, the stable clamping of the side clamping plate to the steel box girder is ensured, and the fixed oil cylinder is bolted with the installation support through the flange, so that the fixed oil cylinder is convenient for disassembly, replacement and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a steel box girder hoisting state structure schematic view of the present application;

[0025] Figure 2 It is a whole structure schematic view of the present application;

[0026] Figure 3 It is a structure schematic view of one of the side clamping plates of the present application;

[0027] Figure 4 It is a structure schematic view of the combined extension unit of the present application;

[0028] Figure 5 It is a structure schematic view of the combined extension unit of the present application;Figure 3 Local explosion structure schematic diagram;

[0029] Figure 6 For the mobile unit structure of the present invention Figure 5 Local structure schematic diagram;

[0030] Figure 7 For the mobile unit structure of the present invention

[0031] Figure 8 For the side plate and combined extension unit structure of the present invention

[0032] Figure 9 For the side plate and combined extension unit structure of the present invention

[0033] Figure 10 For the side plate and combined extension unit structure of the present invention

[0034] In the figure: 1- lifting ring; 2- sling; 3- side plate; 4- fixed unit; 41- fixed oil cylinder; 42- fastening plate; 43- mounting bracket; 5- combined extension unit; 51- side plate one; 52- intermediate plate; 53- side plate two; 54- extension oil cylinder one; 55- extension oil cylinder two; 56- docking oil cylinder; 6- mobile unit; 61- transmission shaft; 62- walking wheel; 63- worm gear; 64- speed reducer motor; 65- worm; 7- roller; 8- drive motor; 9- speed reducer; 10- through slot; 11- ball; 12- buffer pad. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] Example 1: Please refer to Figures 1-2The application provides a technical scheme: a bridge steel box girder hoisting device for hoisting a steel box girder to an installation position, comprising a lifting ring 1 and lifting ropes 2, wherein the four lifting ropes 2 are arranged at the top of the lifting ring 1 and connected with the lifting ring 1, the lifting ring 1 is connected with a lifting hook of a crane, the other ends of the lifting ropes 2 are provided with side clamping plates 3, the side clamping plates 3 can be clamped on the outer sides of the steel box girder, the side clamping plates 3 are provided with fixing units 4, the side clamping plates 3 can stably clamp the two sides of the steel box girder through the fixing units 4, the side clamping plates 3 close to the side of the installed steel box girder are provided with combined extension units 5, when the steel box girder is hoisted to the position where it needs to be installed, the combined extension units 5 can extend to one end of the installed steel box girder and be clamped with the steel box girder, thereby assisting the hoisted steel box girder to be butt-jointed with the installed steel box girder, the remaining side clamping plates 3 are provided with moving units 6, the side clamping plates 3 can move on the sides of the steel box girder through the moving units 6, thereby conveniently adjusting the positions of the lifting ropes 2 to reach a balanced state during hoisting, and detection pieces are further arranged on any one of the side clamping plates 3, the posture of the side clamping plate 3 can be detected through the detection piece, thereby the posture of the hoisted steel box girder can be detected, and the adjustment during hoisting is facilitated.

[0037] During hoisting, the crane is connected with the hoisting device through the lifting ring 1, and the steel box girder is hoisted through the lifting ropes 2, when the steel box girder is not hoisted, the side clamping plates 3 are first placed on the two sides of the steel box girder, in the embodiment, the four side clamping plates 3 are arranged, and two side clamping plates 3 are arranged on the left and right sides of the steel box girder respectively, the steel box girder can be stably hoisted through the four lifting ropes 2, after the side clamping plates 3 are clamped on the outer sides of the steel box girder, the side edges of the steel box girder can be clamped up and down through the fixing units 4, the stable connection between the side clamping plates 3 and the steel box girder is ensured, since the steel box girder has a large volume, the side clamping plates 3 also have a large volume, and in order to ensure the stability and safety of hoisting, the side clamping plates 3 are made of high-strength alloy steel, in order to ensure the balance during hoisting, the positions of the side clamping plates 3 need to be adjusted according to the actual center of gravity of the steel box girder, so that the steel box girder can be kept balanced and the four lifting ropes 2 can be balanced during hoisting, during the adjustment, the side clamping plate 3 at one end of the steel box girder remains unchanged, and the side clamping plate 3 provided with the moving unit 6 at the other end can move along the side edge of the steel box girder, thereby the hoisting position can be adjusted, then the crane hoists the steel box girder, the steel box girder is hoisted to the installation position, the combined extension unit 5 extends out and is connected with the installed steel box girder, thereby assisting the hoisted steel box girder to be connected with the installed steel box girder, avoiding the need for manual measurement multiple times in the traditional hoisting, and the butt joint can be achieved without manual support, thereby increasing the installation efficiency.

[0038] Embodiment 2: see Figures 3-5The application provides a technical scheme: a bridge steel box girder hoisting device, further comprising fixing oil cylinders 41 and fastening plates 42, the side clamping plate 3 is in a U shape as a whole and the inner opening thereof is matched with the outer side of the steel box girder, the fixing unit 4 comprises a plurality of fixing oil cylinders 41 arranged on the upper and lower sides of the side clamping plate 3, and the output ends of the fixing oil cylinders 41 are all provided with the fastening plates 42, and the side clamping plate 3 is provided with avoiding holes through which the fastening plates 42 pass.

[0039] The side clamping plate 3 is integrally forged by high-strength alloy steel, and the upper and lower wing plates can be connected through arc transition sections to avoid stress concentration. The inner surface is sprayed with wear-resistant ceramic coating to reduce frictional damage to the surface of the steel box girder. After the side clamping plate 3 is engaged with the steel box girder, the fixing oil cylinders 41 are elongated to drive the fastening plates 42 to abut against the surface of the steel box girder, and the fixing oil cylinders 41 are arranged on the two wing plates of the side clamping plate 3, thereby forming a wrapping type clamping on the upper and lower sides of the steel box girder. Under the clamping action of the fastening plates 42 on the upper and lower sides, the side clamping plate 3 forms a stable clamping on the steel box girder. The aperture of the avoiding hole is slightly larger than the fastening plate 42, so that the fastening plate 42 can pass through the avoiding hole, and it is ensured that the fastening plate 42 will not be stuck when it is extended.

[0040] The outer side of the fixing oil cylinder 41 is provided with a flange, the side clamping plate 3 is provided with a mounting bracket 43 through bolts, the fixing oil cylinder 41 is bolted to the mounting bracket 43 through the flange, and the two wing plates of the mounting bracket 43 are also bolted to the side clamping plate 3 through a plurality of high-strength bolts, thereby facilitating the disassembly and replacement of the oil cylinder without the need for overall replacement and facilitating timely maintenance.

[0041] Example 3: Please refer to Figure 9The present application provides a technical scheme: a bridge steel box girder hoisting device, further comprising a side plate one 51, an intermediate plate 52 and a side plate two 53, the combined extension unit 5 is composed of the side plate one 51, the intermediate plate 52 and the side plate two 53, the side plate one 51, the intermediate plate 52 and the side plate two 53 are combined to form a U-shaped structure consistent with the shape of the side clamping plate 3, and then the same can be clamped with the outside of the steel box girder, the extension oil cylinder one 54 is arranged in the side plate one 51, the output end of the extension oil cylinder one 54 is fixedly connected with the intermediate plate 52, when the extension oil cylinder one 54 is elongated, the intermediate plate 52 can be driven away from the side plate one 51, the extension oil cylinder two 55 is arranged at the bottom of the intermediate plate 52, the output end of the extension oil cylinder two 55 is fixedly connected with the side plate two 53, when the extension oil cylinder two is elongated, the side plate two 53 can be driven away from the intermediate plate 52, the butt joint oil cylinder 56 is fixedly arranged on the side clamping plate 3, the output end of the butt joint oil cylinder 56 is fixedly connected with the side plate one 51, when the butt joint oil cylinder 56 is elongated, the side plate one 51 can be driven away from the side clamping plate 3, the side plate one 51 drives the intermediate plate 52 and the side plate two 53 to be away from the side clamping plate 3, when the extension oil cylinder one 54 and the extension oil cylinder two 55 are elongated, at this time, the U-shaped structure formed by the combination of the side plate one 51, the intermediate plate 52 and the side plate two 53 is in an expanded state, that is, the upper and lower openings of the U-shaped structure are enlarged, and the length is increased, and then when the gap between the hoisted steel box girder and the installed steel box girder is large, the U-shaped structure can still be fitted into the outside of the installed steel box girder, for details, please refer to Figure 10 , and then when the extension oil cylinder one 54 and the extension oil cylinder two 55 are retracted, the U-shaped structure is gradually retracted until the side plate one 51, the intermediate plate 52 and the side plate two 53 all return to the initial state, at this time, the three are close to the outside of the steel box girder, and the butt joint is completed.

[0042] Embodiment 4: please refer to Figures 4-6 The present application provides a technical scheme: a bridge steel box girder hoisting device, further comprising a roller 7 and a driving motor 8, the roller 7 is rotatably arranged on the side clamping plate 3, the bottom end of the hoisting cable 2 is wound on the roller 7, and the bidirectional rotation of the roller 7 can make the hoisting cable 2 be wound and unwound on the roller 7, the roller 7 is provided with a rotating shaft in the middle, the driving motor 8 is fixedly arranged on the side clamping plate 3, the output end of the driving motor 8 is connected with a speed reducer 9, the connection of the driving motor 8 and the speed reducer 9 can adapt to the large load scene of the steel box girder hoisting, ensure stable use, and the output end of the speed reducer 9 is in transmission connection with the rotating shaft on the roller 7.

[0043] The detection piece is a horizontal sensor, but is not limited, and can also be other sensors that can detect the hoisting state of the steel box girder, such as an inclination sensor.

[0044] When the steel box girder is hoisted to the position where it needs to be installed, if the hoisted steel box girder is placed in parallel with the installed steel box girder, it means that the steel box girder has been placed in the installation position at the bottom, but the position of the steel box girder cannot be adjusted, workers need to observe by themselves and then use the intercom to inform the operator of the crane to hoist and lower the steel box girder multiple times to complete the butt joint installation, the driving motor 8 and the roller 7 are arranged on the side clamping plate 3, the driving motor 8 drives the roller 7 to wind and unwind the sling 2, and when the steel box girder is hoisted to the position where it needs to be installed, the roller 7 on the side clamping plate 3 of the end to be butt jointed can slightly lower the sling 2 by a distance, at this time, the hoisted steel box girder is in a certain inclined state, and the inclined direction is towards the installation side, so that the combined extension unit 5 is wrapped around the installed steel box girder, and the sling 2 on the other side is lowered to complete the butt joint installation of the two steel box girders.

[0045] Example 5: see Figures 6-7 The present application provides a technical solution: a bridge steel box girder hoisting device, further comprising a through slot 10 and a walking wheel 62 arranged in the through slot 10, the back side of the side clamping plate 3 is provided with a through slot 10, the moving unit 6 comprises two transmission shafts 61 rotatably arranged on both sides of the through slot 10, the outer side of the transmission shaft 61 is provided with a walking wheel 62, the outer side of the transmission shaft 61 is further provided with a belt wheel, the outer side of the belt wheel is provided with a belt, and the two transmission shafts 61 are synchronously driven through the belt, wherein the outer side of one of the transmission shafts 61 is further provided with a worm gear 63, and the back side of the side clamping plate 3 is fixedly provided with a speed reducer 64, and the output end of the speed reducer 64 is provided with a worm 65 in transmission engagement with the worm gear 63.

[0046] The speed reducer 64 drives the worm gear 63 and the worm 65 to engage and drive the walking wheel 62 to rotate, when the side clamping plate 3 is engaged with the steel box girder, at this time, the fixed oil cylinder 41 has not clamped the steel box girder, at this time, the walking wheel 62 can drive the side clamping plate 3 to move along the outer side of the steel box girder, so as to adjust the hoisting position.

[0047] A plurality of rolling balls 11 are movably arranged on the inner bottom surface of the side clamping plate 3, when the side clamping plate 3 moves, due to the existence of slight concave-convex on the surface of the steel box girder, traditional sliding friction is easy to cause the side clamping plate 3 to be stuck, the rolling ball 11 reduces the friction resistance through point contact, the rolling ball 11 is installed in a hemispherical groove on the inner bottom of the side clamping plate 3, the diameter of the groove is slightly larger than the diameter of the rolling ball 11, so as to ensure that the rolling ball 11 can freely roll but will not fall off.

[0048] The outer side of the side clamping plate 3 is provided with a buffer pad 12, when the hoisting is finished, the side clamping plate 3 is separated from the steel box girder, at this time, the side clamping plate 3 is close to the middle, that is, moves to the position directly below the lifting ring 1, therefore, by arranging the buffer pad 12 on the outer side of the side clamping plate 3, when the side clamping plates 3 collide with each other, the buffer pad 12 can be used for buffering, the noise when the side clamping plates 3 collide with each other can be reduced, and the coating on the surface of the side clamping plate 3 can also be prevented from being damaged.

[0049] The present application provides a kind of bridge steel box girder hoisting device hoisting construction method, comprising the following steps:

[0050] S1: the side clamping plate 3 is clamped at the outer side of steel box girder, the side clamping plate 3 is moved by moving motor drive walking wheel 62 to make hoisting reach balanced state, and the fastening plate 42 is clamped steel box girder by fixed oil cylinder 41;

[0051] S2: steel box girder is trial hoisted, and the lifting height is less than 200mm, and the mechanical properties of crane are observed;

[0052] S3: steel box girder is slowly lifted, and is hoisted to installation position, during which cable wind rope is used to pull, to prevent steel box girder from rotating horizontally;

[0053] S4: after being hoisted to installation position, the hoisted steel box girder and the steel box girder already installed are butt jointed by combined extension unit 5, to complete installation.

[0054] It should be noted that, in this text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or inherent to such process, method, article, or apparatus.

[0055] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application.

Claims

1. A bridge steel box girder hoisting device, comprising a lifting ring (1) and a lifting rope (2), the lifting rope (2) is provided with a plurality of lifting ropes, and the top of each lifting rope is connected with the lifting ring (1), characterized in that: The side clamping plates (3) are provided with fixing units (4), the side clamping plates (3) close to the side of the installed steel box girder are provided with combined extension units (5), the rest of the side clamping plates (3) are provided with moving units (6), and any one of the side clamping plates (3) is further provided with a detection member; The side clamping plates (3) are in U-shaped structure and the inner side openings thereof are matched with the outer side of the steel box girder, the fixing units (4) include a plurality of fixing oil cylinders (41) arranged on the upper and lower sides of the side clamping plates (3), the output ends of the fixing oil cylinders (41) are provided with fastening plates (42), and the side clamping plates (3) are provided with avoiding holes for the fastening plates (42) to pass through; The outer side of the fixing oil cylinder (41) is provided with a flange, the side clamping plate (3) is provided with a mounting bracket (43) through bolts, and the fixing oil cylinder (41) is bolted to the mounting bracket (43) through the flange. The combined extension unit (5) is composed of a side plate one (51), an intermediate plate (52) and a side plate two (53), the side plate one (51), the intermediate plate (52) and the side plate two (53) are combined to form a U-shaped structure consistent with the shape of the side clamping plate (3), the side plate one (51) is provided with an extension oil cylinder one (54) inside, the output end of the extension oil cylinder one (54) is fixedly connected with the intermediate plate (52), the bottom of the intermediate plate (52) is provided with an extension oil cylinder two (55), the output end of the extension oil cylinder two (55) is fixedly connected with the side plate two (53), the side clamping plate (3) is fixedly provided with a butt joint oil cylinder (56), and the output end of the butt joint oil cylinder (56) is fixedly connected with the side plate one (51). The back side of the side clamping plate (3) is provided with a through groove (10), the moving unit (6) includes two transmission shafts (61) rotatably arranged on the two sides of the through groove (10), the outer side of the transmission shaft (61) is provided with a walking wheel (62), the outer side of the transmission shaft (61) is further provided with a belt wheel, the outer side of the belt wheel is provided with a belt, the two transmission shafts (61) are synchronously driven through the belt, the outer side of one of the transmission shafts (61) is further provided with a worm wheel (63), the back side of the side clamping plate (3) is fixedly provided with a speed reducer motor (64), and the output end of the speed reducer motor (64) is provided with a worm (65) in transmission engagement with the worm wheel (63); A plurality of rolling balls (11) are movably arranged on the inner side bottom surface of the side clamping plate (3).

2. The bridge steel box girder hoisting device according to claim 1, characterized in that: A roller (7) is rotatably arranged on the side clamping plate (3), the bottom end of the sling (2) is wound on the roller (7), the roller (7) is provided with a rotating shaft in the middle, a driving motor (8) is fixedly arranged on the side clamping plate (3), the output end of the driving motor (8) is connected with a speed reducer (9), and the output end of the speed reducer (9) is in transmission connection with the rotating shaft on the roller (7).

3. The bridge steel box girder hoisting device according to claim 1, characterized in that: The detection member is a horizontal sensor.

4. The bridge steel box girder hoisting device according to claim 1, characterized in that: The outer side of the side clamping plate (3) is provided with a buffer pad (12).

5. A hoisting construction method applied to the hoisting device for the bridge steel box girder as claimed in any one of claims 1-4, characterized in that, The method comprises the following steps: S1: the side clamping plate (3) is clamped on the outer side of the steel box girder, the walking wheel (62) is driven by the moving motor to move the side clamping plate (3) to balance the lifting, and the fastening plate (42) is clamped on the steel box girder by the fixed oil cylinder (41); S2: the steel box girder is tested and lifted, the lifting height is less than 200mm, and the mechanical properties of the crane are observed; S3: slowly lifting the steel box girder, lifting it to the installation position, using cable wind rope traction during the period to prevent the steel box girder from rotating horizontally; S4: after lifting to the installation position, the steel box girder is connected to the already installed steel box girder through the combined extension unit (5), and then the installation is completed.

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