Hoisting mechanism for special-shaped large-section steel box girder and operation method of hoisting mechanism

Abstract

The invention relates to a hoisting mechanism for a special-shaped large-section steel box girder and an operation method of the hoisting mechanism, and effectively solves the problems that the special-shaped large-section steel box girder cannot be stably hoisted and kept horizontal conveniently by an existing steel box girder hoisting mechanism and cannot be stably hoisted and the hoisting firmness cannot be ensured. According to the technical scheme, the hoisting mechanism for the special-shaped large-section steel box girder is provided with a bevel gear transmission assembly, a driving assembly, an adjustable rotating rod mechanism and a secondary adjusting mechanism, the driving assembly drives the adjustable rotating rod mechanism to rotate through the bevel gear transmission assembly, and the height of main hoisting ropes on the two sides can be adjusted; therefore, the horizontal state of the special-shaped steel box girder can be preliminarily adjusted through the main lifting rope, then the lifting height of the corresponding auxiliary lifting rope is adjusted through the secondary adjusting mechanism, the horizontal state of the special-shaped steel box girder is adjusted more accurately, the special-shaped steel box girder can be kept in the horizontal state, stable lifting is facilitated, and the special-shaped steel box girder can accurately correspond to a mounting part; the hoisting progress is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of steel box girder hoisting equipment, and in particular to a hoisting mechanism for a special-shaped large-section steel box girder and an operating method thereof. Background Art

[0002] Steel box girder, also known as steel plate box girder, is a commonly used structural form for large-span bridges. In large-span cable-supported bridges, the span of the steel box main beam is hundreds of meters to thousands of meters. It is generally manufactured and installed in several beam sections. Its cross-section has a wide and flat appearance, and the aspect ratio is about 1:10. The steel box girder is generally composed of a top plate, a bottom plate, a web plate, a transverse diaphragm, a longitudinal diaphragm and stiffening ribs connected by a fully welded method. The top plate is an orthogonal anisotropic bridge deck composed of a cover plate and longitudinal stiffening ribs.

[0003] Most of the existing steel box girder lifting mechanisms directly use crane equipment to lift the steel box girder. This lifting method is indeed relatively convenient and quick for steel box girders with regular shapes, but it is not applicable to steel box girders with large cross-sections. The existing lifting mechanisms are not convenient for stably lifting the steel box girders with large cross-sections and keeping them in a horizontal state, which will make it impossible to accurately and stably position the steel box girder at the location where it needs to be installed, affecting the lifting progress; at the same time, the gravity distribution of the steel box girder with large cross-sections is also uneven, and the existing lifting mechanisms cannot stably lift it and ensure the firmness of the lifting.

[0004] In view of the above, we provide a hoisting mechanism and an operating method for special-shaped large-section steel box girders to solve the above problems. Summary of the invention

[0005] In view of the above situation, the present invention provides a hoisting mechanism for special-shaped large-section steel box girders and an operating method thereof. The device can make a preliminary adjustment to the horizontal state of the special-shaped steel box girder through the main hoisting rope, and then adjust the height of the auxiliary hoisting rope through the bevel gear transmission assembly, so that the auxiliary hoisting rope can play an auxiliary hoisting role on the steel box girder, and can adjust the hoisting height of the corresponding bottom end of the auxiliary hoisting rope through the secondary adjustment mechanism, so as to make a more accurate adjustment to the horizontal state of the special-shaped steel box girder when hoisting, so that the special-shaped steel box girder can maintain a horizontal state, facilitate smooth hoisting and accurately correspond to the installation position, and speed up the hoisting progress.

[0006] A lifting mechanism for a special-shaped large-section steel box girder and an operating method thereof, comprising a hanger and an inclined tube, wherein a reinforcing plate for reinforcing the overall strength of the hanger is fixedly connected inside the hanger, a synchronously movable bevel gear transmission assembly is arranged inside the reinforcing plate, and the top of the bevel gear transmission assembly is transmission-connected with a driving assembly for driving its movement, an auxiliary lifting rope for assisting in lifting and adjusting the level of the steel box girder is wound around the outside of the bevel gear transmission assembly, an adjustable rotating rod mechanism which can be transmission-connected to the bevel gear transmission assembly is also arranged inside the hanger, a main lifting rope for lifting the steel box girder is wound around the outside of the adjustable rotating rod mechanism, the inclined tube is fixedly connected to the side of the hanger and a secondary adjusting mechanism for adjusting the auxiliary lifting rope is arranged inside the inclined tube, the auxiliary lifting rope is passed through the secondary adjusting mechanism inside the inclined tube, and the bottom of the auxiliary lifting rope is connected to an auxiliary supporting mechanism for assisting in supporting the middle part of the bottom of the steel box girder.

[0007] Preferably, the reinforcing plate is vertically fixedly connected to the inside of the hanger, and the number of the inclined tubes is several and the several inclined tubes are fixedly connected around the hanger in the form of a rectangular array.

[0008] Preferably, the bevel gear transmission assembly includes a first bevel gear rod, a second bevel gear rod and a driven bevel gear, the number of the first bevel gear rod and the second bevel gear rod are both two and the two ends of the two first bevel gear rods are respectively transmission connected to the two ends of the two second bevel gear rods to form a rectangular structure, the two sides of the rod bodies of the two second bevel gear rods are fixedly connected with driven bevel gears, and the rod bodies of the first bevel gear rod and the second bevel gear rod are fixedly connected with a rope turntable for winding an auxiliary lifting rope.

[0009] Preferably, the number of the rope turntables is several and the several rope turntables are evenly divided into four groups, the four groups of rope turntables are respectively and equidistantly fixedly connected to the rod bodies of the two first bevel gear rods and the two second bevel gear rods, and the several rope turntables correspond to several inclined tubes respectively, the interior of each rope turntable is fixedly connected with an auxiliary rope and each auxiliary rope is respectively inserted into the interior of the corresponding inclined tube.

[0010] Preferably, the driving assembly includes a dual-axis reduction motor, a worm, a worm wheel and an active bevel gear, the worm is splined to the output end of the dual-axis reduction motor and the worm is connected to both sides of the output end of the dual-axis reduction motor, the sides of the two worms are drivingly connected to the worm wheels, the active bevel gear is fixedly connected to the worm wheel and the active bevel gear is arranged inside the hanger and the worm wheel is arranged on the upper surface of the hanger, the active bevel gears on both sides of the two worms are respectively drivingly connected to the two driven bevel gears at the same position outside the two second bevel gear rods, the number of the driving assemblies is two and the two driving assemblies are symmetrically arranged with the vertical center line of the hanger as the symmetry axis, and the two active bevel gears in another driving assembly are respectively drivingly connected to the other two driven bevel gears outside the two second bevel gear rods.

[0011] Preferably, the adjustable rotating rod mechanism includes an electric push rod, a support plate and a spur gear rod, the support plate is fixedly connected to the movable rod body part of the electric push rod and the electric push rod is fixedly installed on the side of the reinforcing plate, the spur gear rod is rotatably connected to the side of the support plate and support plates and electric push rods are provided at both ends of the spur gear rod body, both ends of the spur gear rod body are fixedly connected to a rope turntable for winding a main rope and the top end of the main rope is fixedly connected and can be wound around the inside of the rope turntable.

[0012] Preferably, the spur gear rod is inserted into the reinforcing plate, and the second bevel gear rod body and the corresponding parts of the two ends of the spur gear rod are fixedly connected with spur gears for driving the spur gear rod to rotate, and the spur gear rod is meshed with the spur gear on the second bevel gear rod body.

[0013] Preferably, the secondary adjustment mechanism includes a hydraulic rod, a pulley bracket and a pulley, the pulley bracket is fixedly mounted on the movable end of the hydraulic rod and the pulley is rotatably connected to the inside of the pulley bracket, the hydraulic rod is fixedly mounted on the outer surface of the inclined tube and the movable rod body is partially passed through the inside of the inclined tube, the number of the secondary adjustment mechanisms is several and the several secondary adjustment mechanisms are staggered up and down on the inclined tube, and the auxiliary lifting rope is passed between several pulleys in its corresponding inclined tube.

[0014] Preferably, the auxiliary support mechanism includes a first shear plate and a second shear plate, wherein the ends of the first shear plate and the second shear plate that are close to each other are hinged to each other to form a scissors-type structure, and the ends of the first shear plate and the second shear plate that are far away from each other are respectively hung on the bottom of the auxiliary suspension ropes on both sides of the hanger.

[0015] An operating method for a hoisting mechanism for a special-shaped large-section steel box girder comprises the following steps: 1. In the initial state, the lengths and lower heights of multiple main lifting ropes are the same, the lengths and lower heights of multiple auxiliary lifting ropes are the same, the bottom ends of the auxiliary lifting ropes are lower than the main lifting ropes, and the hanger is hoisted horizontally by an external crane. When it is necessary to hoist a special-shaped large-section steel box girder, the hanger is controlled to move down to a height suitable for hoisting the steel box girder; Second, control the operation of the driving assembly, drive the adjustable rotating rod mechanism to rotate through the bevel gear transmission assembly, so that the main lifting rope is synchronously dropped to the upper surface of the special-shaped steel box girder, and then manually hang the main lifting rope on the hanging parts at the four corners of the upper surface of the steel box girder and tighten the main lifting rope, and at the same time separate the adjustable rotating rod mechanism from the bevel gear transmission assembly; 3. Then, the driving component is used to control the activity of the bevel gear transmission component, and the bottom ends of the auxiliary lifting ropes around the periphery are dropped to the bottom of the steel box girder, and the auxiliary lifting ropes are manually connected to the bottom of the steel box girder, and all the auxiliary lifting ropes are tightened through the driving component and the bevel gear transmission component; Fourth, the hanger and the steel box girder are then lifted by an external crane equipment, and the secondary adjustment mechanism of the corresponding part is controlled to move according to the state of the steel box girder when it is lifted. When the steel box girder is in a tilted state, the movable end of the hydraulic rod in the inclined tube on the inclined side is controlled to be pushed outward, so that multiple pulleys push the part of the auxiliary lifting rope in the inclined tube to a bent wave state, so that the bottom height of a single auxiliary lifting rope can be fine-tuned, and the hydraulic rod of the corresponding part is controlled to be pushed out to a suitable distance according to the tilt angle of the steel box girder, so that the state of the steel box girder can be adjusted to keep it in a horizontal state at all times, thereby completing the lifting construction of the steel box girder.

[0016] The above technical solution has the following beneficial effects: The hoisting mechanism for the special-shaped large-section steel box girder is provided with a bevel gear transmission component, a driving component, an adjustable rotating rod mechanism and a secondary adjusting mechanism. The adjustable rotating rod mechanisms on both sides can be individually controlled to be connected to the bevel gear transmission component for transmission. The driving component drives the adjustable rotating rod mechanism to rotate through the bevel gear transmission component, and can adjust the height of the main hoisting ropes on both sides, so that the horizontal state of the special-shaped steel box girder can be preliminarily adjusted through the main hoisting rope, and then the height of the auxiliary hoisting rope is adjusted through the bevel gear transmission component, so that the auxiliary hoisting rope can play an auxiliary hoisting role for the steel box girder, and the lifting height of the corresponding bottom end of the auxiliary hoisting rope can be adjusted through the secondary adjusting mechanism, so that the horizontal state of the special-shaped steel box girder when hoisting can be more accurately adjusted, so that the special-shaped steel box girder can maintain a horizontal state, which is convenient for stable hoisting and accurately corresponds to the installation position, and speeds up the hoisting progress; and the secondary adjusting mechanism can make each auxiliary hoisting rope evenly apply tension to the steel box girder, ensuring good stability and firmness when hoisting the steel box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the hanger and the cross-section state of the inclined tube of the present invention; Figure 3 It is a schematic diagram of the hanger structure of the present invention; Figure 4 It is a schematic diagram of the connection state of the bevel gear transmission assembly, the drive assembly and the adjustable rotating rod mechanism of the present invention; Figure 5 It is a schematic diagram of the bevel gear transmission assembly and the drive assembly of the present invention; Figure 6 It is a schematic diagram of the adjustable rotating rod mechanism of the present invention; Figure 7 It is a schematic diagram of the adjustable rotating rod mechanism and the limiting mechanism of the present invention; Figure 8 It is a schematic diagram of the disassembly of the hanger and bevel gear transmission assembly of the present invention; Fig. 9 This is a schematic diagram of the disassembly of the drive assembly of the present invention; Fig.10 This is a schematic diagram of the secondary regulating mechanism of the present invention; Fig.11 It is a schematic diagram of the auxiliary support mechanism of the present invention.

[0018] In the figure: 1. hanger; 2. inclined tube; 3. reinforcement plate; 4. auxiliary lifting rope; 5. main lifting rope; 6. first bevel gear rod; 7. second bevel gear rod; 8. driven bevel gear; 9. lifting rope turntable; 10. double-axis reduction motor; 11. worm; 12. worm wheel; 13. active bevel gear; 14. electric push rod; 15. support plate; 16. spur gear rod; 17. spur gear; 18. hydraulic rod; 19. pulley bracket; 20. pulley; 21. first shear plate; 22. second shear plate; 23. arc bracket; 24. spring. DETAILED DESCRIPTION

[0019] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figures 1 to 11 It can be clearly presented in the detailed description of the embodiments that the structural contents mentioned in the following embodiments are all referenced to the drawings in the specification.

[0020] This embodiment provides a lifting mechanism for a special-shaped large-section steel box girder, as shown in the attached Figure 1-11 As shown, it includes a hanger 1 and an inclined tube 2. A reinforcing plate 3 for reinforcing the overall strength of the hanger 1 is fixedly connected inside the hanger 1. The reinforcing plate 3 is vertically fixedly connected inside the hanger 1. The reinforcing plate 3 is composed of crisscrossed plates fixedly connected to each other, which can improve the overall bearing capacity of the hanger 1. The number of the inclined tubes 2 is several and the several inclined tubes 2 are fixedly connected around the hanger 1 in the form of a rectangular array, and the openings of the inclined tubes 2 are all inclined downward; A bevel gear transmission assembly that can move synchronously is arranged inside the reinforcing plate 3, and an auxiliary lifting rope 4 for assisting the lifting and adjusting the level of the steel box beam is wound around the outside of the bevel gear transmission assembly. The bevel gear transmission assembly includes a first bevel gear rod 6, a second bevel gear rod 7 and a driven bevel gear 8. The number of the first bevel gear rod 6 and the second bevel gear rod 7 is two, and the two ends of the two first bevel gear rods 6 are respectively connected to the two ends of the two second bevel gear rods 7 to form a rectangular structure. The outsides of the two first bevel gear rods 6 and the two second bevel gear rods 7 are sleeved with a support for supporting and limiting them, and the support is fixedly installed on the inner bottom wall of the hanger 1, and the two first bevel gear rods 6 and the two second bevel gear rods 7 are connected to the inner bottom wall of the hanger 1. The bevel gear rods 7 are rotatably connected to the side surfaces of the reinforcing plate 3, and the two second bevel gear rods 7 are fixedly connected with driven bevel gears 8 on both sides of the rod bodies. The first bevel gear rod 6 and the second bevel gear rod 7 are fixedly connected with rope turntables 9 for winding the auxiliary rope 4. The number of rope turntables 9 is several and the several rope turntables 9 are evenly divided into four groups. The four groups of rope turntables 9 are respectively and equidistantly fixedly connected to the rod bodies of the two first bevel gear rods 6 and the two second bevel gear rods 7, and the several rope turntables 9 correspond to the several inclined tubes 2 respectively. The interior of each rope turntable 9 is fixedly connected with the auxiliary rope 4 and each auxiliary rope 4 is respectively inserted into the interior of the corresponding inclined tube 2.

[0021] The top transmission connection of the bevel gear transmission assembly is connected with a driving assembly for driving its activities, and the driving assembly includes a dual-axis reduction motor 10, a worm 11, a worm wheel 12 and an active bevel gear 13. The worm 11 is connected to the output end of the dual-axis reduction motor 10 through a spline, and the worm 11 is connected to both sides of the output end of the dual-axis reduction motor 10. The sides of the two worms 11 are both transmission-connected with the worm wheels 12. The active bevel gear 13 is fixedly connected to the worm wheel 12, and the active bevel gear 13 is arranged inside the hanger 1 and the worm wheel 12 is arranged on the upper surface of the hanger 1. The active bevel gears 13 corresponding to the two worms 11 are respectively transmission-connected to the two driven bevel gears 8 at the same position outside the two second bevel gear rods 7. The number of the driving assemblies is two, and the two driving assemblies are arranged vertically with the hanger 1. The straight center line is symmetrically arranged as the axis of symmetry. The two active bevel gears 13 in another driving component are respectively connected to the other two driven bevel gears 8 outside the two second bevel gear rods 7. The dual-axis reduction motors 10 on both sides synchronously drive the worm 11 at both ends to rotate, which can drive the worm wheels 12 on both sides to rotate. The worm wheels 12 drive the active bevel gear 13 below it to rotate, and can drive the two second bevel gear rods 7 to rotate through the driven bevel gears 8 on the two second bevel gear rods 7. The two second bevel gear rods 7 are connected to the first bevel gear rods 6 on both sides, so the two first bevel gear rods 6 will also rotate synchronously, so that the two second bevel gear rods 7 and the rope turntables 9 on the two first bevel gear rods 6 can rotate synchronously, and the auxiliary rope 4 can be synchronously controlled to rise or fall.

[0022] The hanger 1 is also provided with an adjustable rotating rod mechanism which can be connected to the bevel gear transmission assembly in a transmission manner. The main lifting rope 5 for lifting the steel box girder is wound around the outside of the adjustable rotating rod mechanism. The main lifting rope 5 is passed through the lower surface of the hanger 1. The adjustable rotating rod mechanism includes an electric push rod 14, a support plate 15 and a spur gear rod 16. The support plate 15 is fixedly connected to the movable rod body part of the electric push rod 14 and the electric push rod 14 is fixedly installed on the side of the reinforcing plate 3. The spur gear rod 16 is rotatably connected to the side of the support plate 15 and the support plate 15 and the electric push rod 14 are provided at both ends. The two ends of the rod body of the spur gear rod 16 are fixedly connected to the rope turntable 9 for winding the main lifting rope 5. The top end of the main hoisting rope 5 is fixedly connected and can be wound around the inside of the hoisting rope turntable 9; the spur gear rod 16 is inserted into the inside of the reinforcing plate 3 and can rotate therein; the second bevel gear rod 7 and the corresponding parts of the two ends of the spur gear rod 16 are fixedly connected with a spur gear 17 for driving the spur gear rod 16 to rotate; the spur gear rod 16 is meshed with the spur gear 17 on the rod body of the second bevel gear rod 7; the electric push rod 14 can drive the spur gear rod 16 to move laterally through the support plate 15, so that the spur gear rod 16 is meshed with or separated from the spur gear 17 on the second bevel gear rod 7, and whether to drive the spur gear rod 16 to rotate through the bevel gear transmission assembly can be selected according to the situation.

[0023] The gear parts at both ends of the spur gear rod 16 are provided with limiting mechanisms, which include arc-shaped brackets 23 and springs 24. The arc-shaped brackets 23 are hinged on the side of the reinforcing plate 3 and the movable end is pressed against the gear groove on the spur gear rod 16. One end of the spring 24 is fixedly connected to the side of the arc-shaped bracket 23 away from the spur gear rod 16 and the other end is fixedly connected to the inner top wall of the hanger 1. The gears at both ends of the spur gear rod 16 are provided with arc-shaped brackets 23 above and below, and the arc-shaped brackets 23 are clamped on the same side of the gears. When the electric push rod 14 drives the spur gear rod 16 to separate from the spur gear 17, it will abut against the upper and lower arc-shaped brackets 23. The upper and lower arc-shaped brackets 23 can limit the spur gear rod 16, so that the spur gear rod 16 cannot rotate counterclockwise or clockwise, thereby fixing the spur gear rod 16 and fixing the lifting height of the main hoisting rope 5. The spacing between the spur gear 17 and its adjacent arc-shaped bracket 23 is slightly larger than the diameter of the gear at the end of the spur gear rod 16. When the electric push rod 14 drives the spur gear rod 16 to move toward one side of the arc-shaped bracket 23, the side of the gear at the end of the spur gear rod 16 close to the spur gear 17 is completely separated from the spur gear 17, and the tooth groove close to the side of the arc-shaped bracket 23 is just completely engaged with the movable end of the arc-shaped bracket 23. Similarly, when the electric push rod 14 drives the spur gear rod 16 to move toward one side of the spur gear 17, the side of the gear at the end of the spur gear rod 16 close to the arc-shaped bracket 23 is completely separated from the arc-shaped bracket 23, and the side close to the spur gear 17 is just completely meshed with the spur gear 17. Therefore, the spur gear rod 16 can be smoothly separated or meshed with the spur gear 17, which can prevent the spur gear rod 16 from being pulled and rotated by the gravity on the main hoisting rope 5 at the moment of separation from the spur gear 17 or the arc-shaped bracket 23, causing the hoisted steel box girder to suddenly fall.

[0024] The inclined tube 2 is fixedly connected to the side of the hanger 1 and is provided with a secondary adjustment mechanism for adjusting the auxiliary lifting rope 4. The auxiliary lifting rope 4 is passed through the secondary adjustment mechanism inside the inclined tube 2. The secondary adjustment mechanism includes a hydraulic rod 18, a pulley bracket 19 and a pulley 20. The pulley bracket 19 is fixedly mounted on the movable end of the hydraulic rod 18 and the pulley 20 is rotatably connected to the inside of the pulley bracket 19. The hydraulic rod 18 is fixedly mounted on the outer surface of the inclined tube 2 and the movable rod body is partially passed through the inside of the inclined tube 2. The number of secondary adjustment mechanisms is several and several secondary adjustment mechanisms are staggered up and down on the inclined tube 2. The auxiliary lifting rope 4 is passed between several pulleys 20 in its corresponding inclined tube. The auxiliary lifting rope 4 can slide between each pulley 20 when moving up and down. The pulley 20 can reduce the friction on the auxiliary lifting rope 4, thereby extending the service life of the auxiliary lifting rope 4.

[0025] When it is necessary to fine-tune the lifting height of the auxiliary lifting rope 4, the lifting height of the auxiliary lifting rope 4 can be adjusted by controlling the movable ends of each hydraulic rod 18 to push outward or retract inward. When the movable ends of the hydraulic rods 18 in one or several adjacent inclined tubes 2 are pushed outward, the auxiliary lifting ropes 4 inside can be pushed into a wave shape, thereby increasing the length of the auxiliary lifting ropes 4 in the inclined tube 2, and the bottom ends of the corresponding auxiliary lifting ropes 4 can be moved up to be higher than other auxiliary lifting ropes 4, so that the lifting height of the auxiliary lifting ropes 4 can be adjusted by controlling the extended length of the movable ends of the hydraulic rods 18. The bottom ends of the auxiliary lifting ropes 4 are hung on the steel box girder, so the inclined part of the steel box girder can be finely adjusted, so that the steel box girder can also maintain a horizontal state during lifting, which is more convenient for accurate installation.

[0026] The bottom of the auxiliary lifting rope 4 is connected with an auxiliary supporting mechanism for auxiliary supporting the middle part of the bottom of the steel box beam, and the auxiliary supporting mechanism includes a first shear plate 21 and a second shear plate 22. The ends of the first shear plate 21 and the second shear plate 22 that are close to each other are hinged to each other to form a scissor-fork structure, and the ends of the first shear plate 21 and the second shear plate 22 that are far away from each other are respectively hung on the bottom of the auxiliary lifting rope 4 on both sides of the hanger 1; Since the steel box girder structure is large and its own gravity is heavy, when it is hoisted, each part of its bottom has a large downward self-gravity, and the existing hoisting mechanisms are all hoisted on the hoisting parts on the upper surface of the steel box girder, and do not have a good bearing and supporting effect on the bottom. Therefore, the hoisting parts may be loosely connected and cause the hoisting parts of the steel box girder to fall off. Therefore, it is also very necessary to support and hoist the bottom of the steel box girder when hoisting the steel box girder; when hoisting the steel box girder by the hoisting mechanism, the auxiliary support mechanism can be placed at the bottom of the steel box girder, and the two ends of the first shear plate 21 and the second shear plate 22 can be hoisted by the auxiliary hoisting ropes 4 on both sides, and the first shear plate 21 The top of the hinged part of the first shear plate 21 and the second shear plate 22 will abut against the lower surface of the steel box girder. When the auxiliary lifting rope 4 is lifted upward, the auxiliary supporting mechanism will press the top of the hinged part of the first shear plate 21 and the second shear plate 22 downward under the action of the gravity of the steel box girder until the two are parallel to each other and then stably supported on the lower surface of the steel box girder. The hinged parts of the first shear plate 21 and the second shear plate 22 are overlapped. Under the lifting action of the auxiliary lifting rope 4, the auxiliary supporting mechanism can support the middle part of the bottom of the steel box girder, so that the bottom of the steel box girder can also be supported when the steel box girder is lifted, which can effectively prevent the lifting part of the steel box girder from accidentally falling off and ensure the smooth lifting of the steel box girder.

[0027] An operating method implemented by using the above structure comprises the following steps: 1. In the initial state, the lengths and lower heights of the multiple main lifting ropes 5 are the same, the lengths and lower heights of the multiple auxiliary lifting ropes 4 are the same, the bottom ends of the auxiliary lifting ropes 4 are lower than the main lifting ropes 5, the spur gear rods 16 on both sides are connected to the second bevel gear rods 7 on both sides by the electric push rods 14, and the hanger 1 is hoisted horizontally by the external crane equipment. When it is necessary to hoist the special-shaped large-section steel box girder, the hanger 1 is controlled to move down to a height suitable for hoisting the steel box girder; Second, control the operation of the driving assembly, and drive the adjustable rotating rod mechanism to rotate through the bevel gear transmission assembly, so that the main lifting rope 5 falls synchronously to the upper surface of the special-shaped steel box girder, and then manually hang the main lifting rope 5 on the hanging parts at the four corners of the upper surface of the steel box girder and tighten the main lifting rope 5, and then observe the horizontal state of the special-shaped steel box girder. When the main lifting rope 5 lifts the special-shaped steel box girder, the steel box girder is not in a horizontal state. The adjustable rotating rod assembly on the side that does not need to be adjusted can be separated from the second bevel gear rod 7 adjacent to it, and the adjustable rotating rod assembly on this side can be limited and fixed by the limiting mechanism, so that the steel box girder is close to the part on this side. The position remains fixed; then the driving assembly drives the bevel gear transmission assembly to move, thereby driving the adjustable rotating rod assembly connected to it to move, so that the main lifting rope 5 on the adjustable rotating rod assembly on this side rises, thereby lifting the inclined part of the steel box girder upward, making the steel box girder close to a horizontal state, which can facilitate the smooth lifting of the steel box girder. After the steel box girder is initially adjusted to a state close to a horizontal state, the adjustable rotating rod assembly on the adjustment side is controlled to separate from the second bevel gear rod 7, so that the adjustable rotating rod assemblies on both sides are separated from the bevel gear transmission assembly, and the movement of the bevel gear transmission assembly no longer affects the main lifting rope 5; 3. Then, the driving component is used to control the activity of the bevel gear transmission component, and the bottom ends of the auxiliary lifting ropes 4 around the periphery are dropped to the bottom of the steel box girder, and the auxiliary lifting ropes 4 are manually hooked to the bottom of the steel box girder. The auxiliary support mechanism can also be hooked to the bottom of the steel box girder, and all the auxiliary lifting ropes 4 are tightened by the driving component and the bevel gear transmission component; Fourth, the hanger 1 and the steel box girder are then lifted by an external crane device, and the secondary adjustment mechanism of the corresponding part is controlled to move according to the state of the steel box girder when it is lifted. When the steel box girder is in a tilted state, the movable end of the hydraulic rod 18 in the inclined tube 2 on the inclined side is controlled to be pushed outward, so that the multiple pulleys 20 inside it push the part of the auxiliary lifting rope 4 in the inclined tube 2 to a bent wave state, so that the bottom height of a single auxiliary lifting rope 4 can be fine-tuned, and the hydraulic rod 18 of the corresponding part is controlled to be pushed out to a suitable distance according to the tilt angle of the steel box girder, so that the state of the steel box girder can be adjusted to keep it in a horizontal state at all times, thereby completing the lifting construction of the steel box girder.

[0028] The above description is only for illustrating the present invention. It should be understood that the present invention is not limited to the above embodiments, and various variations that conform to the concept of the present invention are within the protection scope of the present invention.

Claims

1. A hoisting mechanism for a special-shaped large-section steel box girder, comprising a hanger (1) and an inclined tube (2), characterized in that: The hanger (1) is fixedly connected to a reinforcing plate (3) for reinforcing the overall strength of the hanger (1); a bevel gear transmission assembly that can move synchronously is arranged inside the reinforcing plate (3); the top of the bevel gear transmission assembly is transmission-connected to a driving assembly for driving its movement; an auxiliary lifting rope (4) for assisting in lifting and adjusting the level of the steel box girder is wound around the outside of the bevel gear transmission assembly; an adjustable rotating rod mechanism that can be transmission-connected to the bevel gear transmission assembly is also arranged inside the hanger (1); a main lifting rope (5) for lifting the steel box girder is wound around the outside of the adjustable rotating rod mechanism; the inclined tube (2) is fixedly connected to the side of the hanger (1) and a secondary adjustment mechanism for adjusting the auxiliary lifting rope (4) is arranged inside the inclined tube (2); the auxiliary lifting rope (4) is inserted into the secondary adjustment mechanism inside the inclined tube (2); and the bottom of the auxiliary lifting rope (4) is connected to an auxiliary support mechanism for assisting in supporting the middle part of the bottom of the steel box girder.

2. The hoisting mechanism for special-shaped large-section steel box beam according to claim 1 is characterized in that: The reinforcing plate (3) is vertically fixedly connected to the inside of the hanger (1); the number of the inclined tubes (2) is a plurality and the plurality of inclined tubes (2) are fixedly connected to the periphery of the hanger (1) in the form of a rectangular array.

3. The hoisting mechanism for special-shaped large-section steel box beam according to claim 1 is characterized in that: The bevel gear transmission assembly comprises a first bevel gear rod (6), a second bevel gear rod (7) and a driven bevel gear (8); the number of the first bevel gear rod (6) and the number of the second bevel gear rod (7) are both two, and the two ends of the two first bevel gear rods (6) are respectively connected to the two ends of the two second bevel gear rods (7) to form a rectangular structure; the two sides of the rod bodies of the two second bevel gear rods (7) are fixedly connected to the driven bevel gear (8); the rod bodies of the first bevel gear rod (6) and the second bevel gear rod (7) are fixedly connected to a rope rotating disk (9) for winding the auxiliary rope (4).

4. The hoisting mechanism for special-shaped large-section steel box beam according to claim 3 is characterized in that: The number of the rope turntables (9) is several and the several rope turntables (9) are evenly divided into four groups. The four groups of rope turntables (9) are respectively and equidistantly fixedly connected to the rod bodies of the two first bevel gear rods (6) and the two second bevel gear rods (7). The several rope turntables (9) respectively correspond to the several inclined tubes (2). The interior of each rope turntable (9) is fixedly connected to an auxiliary rope (4) and each auxiliary rope (4) is respectively passed through the interior of the corresponding inclined tube (2).

5. The hoisting mechanism for special-shaped large-section steel box beam according to claim 1 is characterized in that: The driving assembly comprises a dual-shaft reduction motor (10), a worm (11), a worm wheel (12) and an active bevel gear (13); the worm (11) is connected to the output end of the dual-shaft reduction motor (10) via a spline, and both sides of the output end of the dual-shaft reduction motor (10) are connected to the worm (11); the sides of the two worms (11) are drivingly connected to the worm wheel (12); the active bevel gear (13) is fixedly connected to the worm wheel (12), and the active bevel gear (13) is arranged inside the hanger (1) and the worm wheel (12) is connected to the worm wheel (12). A wheel (12) is arranged on the upper surface of the hanger (1), and the active bevel gears (13) on both sides of the two worm gears (11) are respectively connected to two driven bevel gears (8) at the same position outside the two second bevel gear rods (7). The number of the drive components is two and the two drive components are symmetrically arranged with the vertical center line of the hanger (1) as the symmetry axis. The two active bevel gears (13) in another drive component are respectively connected to the other two driven bevel gears (8) outside the two second bevel gear rods (7).

6. The hoisting mechanism for special-shaped large-section steel box beam according to claim 4, characterized in that: The adjustable rotating rod mechanism comprises an electric push rod (14), a support plate (15) and a spur gear rod (16); the support plate (15) is fixedly connected to a movable rod body portion of the electric push rod (14), and the electric push rod (14) is fixedly mounted on a side of the reinforcing plate (3); the spur gear rod (16) is rotatably connected to the side of the support plate (15), and the support plate (15) and the electric push rod (14) are provided at both ends of the spur gear rod (16); both ends of the rod body of the spur gear rod (16) are fixedly connected to a rope turntable (9) for winding a main rope (5), and the top end of the main rope (5) is fixedly connected and can be wound inside the rope turntable (9).

7. The hoisting mechanism for special-shaped large-section steel box beam according to claim 6, characterized in that: The spur gear rod (16) is inserted into the reinforcing plate (3); corresponding portions of the rod body of the second bevel gear rod (7) and the two ends of the spur gear rod (16) are fixedly connected with a spur gear (17) for driving the spur gear rod (16) to rotate; the spur gear rod (16) is meshed with the spur gear (17) on the rod body of the second bevel gear rod (7).

8. The hoisting mechanism for special-shaped large-section steel box beam according to claim 1, characterized in that: The secondary adjustment mechanism comprises a hydraulic rod (18), a pulley bracket (19) and a pulley (20); the pulley bracket (19) is fixedly mounted on the movable end of the hydraulic rod (18) and the pulley (20) is rotatably connected to the inside of the pulley bracket (19); the hydraulic rod (18) is fixedly mounted on the outer surface of the inclined tube (2) and the movable rod body part is inserted into the inside of the inclined tube (2); the number of the secondary adjustment mechanisms is a plurality and the plurality of secondary adjustment mechanisms are staggered up and down on the inclined tube (2); and the auxiliary lifting rope (4) is inserted between the plurality of pulleys (20) in the corresponding inclined tube.

9. The hoisting mechanism for special-shaped large-section steel box beam according to claim 1, characterized in that: The auxiliary support mechanism comprises a first shear plate (21) and a second shear plate (22), wherein the ends of the first shear plate (21) and the second shear plate (22) that are close to each other are hinged to each other to form a scissor-type structure, and the ends of the first shear plate (21) and the second shear plate (22) that are far away from each other are respectively hung at the bottom of the auxiliary suspension ropes (5) on both sides of the suspension frame (1).

10. An operation method implemented by using a hoisting mechanism for a special-shaped large-section steel box girder according to any one of claims 1 to 9, characterized in that: The steps include:

1. In the initial state, the lengths and the lower heights of the plurality of main lifting ropes (5) are the same, the lengths and the lower heights of the plurality of auxiliary lifting ropes (4) are the same, the bottom ends of the auxiliary lifting ropes (4) are lower than the main lifting ropes (5), and the hanger (1) is hoisted horizontally by an external hoisting device. When it is necessary to hoist a special-shaped large-section steel box girder, the hanger (1) is controlled to move downward to a height suitable for hoisting the steel box girder; 2. Control the driving assembly to operate, drive the adjustable rotating rod mechanism to rotate through the bevel gear transmission assembly, so that the main lifting rope (5) is synchronously dropped to the upper surface of the special-shaped steel box girder, and then manually hang the main lifting rope (5) on the hanging parts at the four corners of the upper surface of the steel box girder and tighten the main lifting rope (5), and at the same time separate the adjustable rotating rod mechanism from the bevel gear transmission assembly; 3. Then, the driving assembly controls the bevel gear transmission assembly to move, and the bottom ends of the auxiliary lifting ropes (4) around the periphery are dropped to the bottom of the steel box girder, and the auxiliary lifting ropes (4) are manually connected to the bottom of the steel box girder, and all the auxiliary lifting ropes (4) are tightened by the driving assembly and the bevel gear transmission assembly; Fourth, the hanger (1) and the steel box girder are then lifted by an external crane device, and the secondary adjustment mechanism of the corresponding part is controlled to move according to the state of the steel box girder when it is lifted. When the steel box girder is in a tilted state, the movable end of the hydraulic rod (18) in the inclined tube (2) on the inclined side is controlled to be pushed outward, so that the plurality of pulleys (20) push the part of the auxiliary lifting rope (4) in the inclined tube (2) to a bent wave state, thereby fine-tuning the bottom height of a single auxiliary lifting rope (4). According to the tilt angle of the steel box girder, the hydraulic rod (18) of the corresponding part is controlled to be pushed out to a suitable distance, so that the state of the steel box girder can be adjusted so that it always maintains a horizontal state, thereby completing the lifting construction of the steel box girder.

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