A hoisting device and method for steel box girder construction

Abstract

The present invention relates to the technical field of steel box girder hoisting, and specifically to a hoisting device and method for steel box girder construction, comprising two groups of support frames arranged in parallel, the same side of the two groups of support frames are supported by a group of support legs, the bottom of the support legs is equipped with a support pulley, the upper surfaces of the two groups of support frames are fixedly connected with horizontally arranged cross plates, and both sides of the upper part of the cross plates are provided with symmetrically arranged adjustable track components; the steel box girder is hoisted and lifted by a hoist, and when the steel box girder is lifted, the weight of the steel box girder is used to drive the second track to move downward, and the second track is squeezed when it moves downward to squeeze the arc-shaped support plate and the first hydraulic telescopic rod, and when the first hydraulic telescopic rod is squeezed, the output end of the second hydraulic telescopic rod is driven to extend, and when the output end of the second hydraulic telescopic rod is extended, it drives the leg pad to move downward, and the leg pad is squeezed and contacted with the ground, so as to improve the stability of the device during hoisting.

Description

Technical Field

[0001] The invention relates to the technical field of steel box girder hoisting, and in particular to a hoisting device and method for steel box girder construction. Background Art

[0002] Steel box girders are important components for building long-span highway bridges. After production, steel box girders need to be transported to the site by transportation equipment, and then hoisted by hoisting equipment to the location where they need to be installed.

[0003] At present, when lifting the steel box girder, most of them use a gantry and a hoist to lift it. During the lifting, the hoist needs to be moved to one side of the gantry and lift the steel box girder. After lifting, the steel box girder is moved to the top of the bridge pier by relying on the hoist, and the steel box girder is placed on the bridge pier. At this time, the installation of the steel box girder is completed; due to the heavy weight of the steel box girder, when the hoist moves to one side of the gantry and lifts it, the pressure on one side of the gantry will be relatively large, thereby affecting the stability of the gantry. Therefore, a lifting device and method for steel box girder construction are proposed to facilitate improving the overall stability of the gantry when lifting the steel box girder. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a hoisting device and method for steel box girder construction to improve the overall stability of the gantry when hoisting the steel box girder.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a hoisting device for steel box girder construction, comprising two groups of support frames arranged in parallel, the same side of the two groups of support frames are supported by a group of support legs, the bottom of the support legs is equipped with a support pulley, the upper surfaces of the two groups of support frames are fixedly connected with horizontally arranged cross plates, both sides of the upper part of the cross plates are equipped with symmetrically arranged adjustable track components, a first track with a circular cross section is installed on the cross plate, the first track is located between the two groups of adjustable track components, a horizontally arranged sliding plate is provided on the first track, a hoist is installed on the upper surface of the sliding plate, and a plurality of groups of electric rollers are provided on the lower surface of the sliding plate, the electric rollers are located on the first track and in rolling contact with the first track;

[0006] A driving structure is provided in the adjustable track assembly, and auxiliary supporting structures are provided at the lower parts of the two groups of supporting legs. The driving structure is used to drive the auxiliary supporting structure.

[0007] Preferably, the adjustable track assembly includes a mounting frame, a mounting slot is provided in the mounting frame, the top of the mounting slot and a side close to the first track are both open, a second track which is horizontally arranged and circular in cross section is provided in the mounting frame, a plurality of groups of arc-shaped support plates are provided at the lower part of the second track, and a reset spring is fixedly connected between the lower part of the arc-shaped support plate and the inner wall of the mounting frame;

[0008] A driving structure is provided at the lower part of the transverse plate, and the upper end of the driving structure is fixedly connected to the lower part of the arc-shaped support plate. An adjusting structure is provided at one end of the second track away from the first track, and the adjusting structure is used to drive the second track to rotate.

[0009] Preferably, the adjustment structure includes a rotating shaft, which is located at the end of the second track away from the first track, the rotating shaft is connected to one end of the second track through a one-way bearing, a vertically arranged positioning groove is provided on the inner side of the mounting frame, the end of the rotating shaft away from the second track is rotatably connected to a slider, the slider is slidably connected to the positioning groove, a gear is fixedly connected to the rotating shaft, a vertically arranged rack is provided on the inner wall of the mounting frame, and the gear and the rack are meshed for transmission.

[0010] Preferably, a plurality of groups of balls are installed on the inner side of the arc-shaped support plate, and the balls are in rolling contact with the second track.

[0011] Preferably, the driving structure includes several groups of first hydraulic telescopic rods, the fixed ends of the first hydraulic telescopic rods are fixedly connected to the lower surface of the cross plate, the output ends of the first hydraulic telescopic rods pass through the cross plate and the mounting frame and are slidably connected to the cross plate and the mounting frame, the output ends of the first hydraulic telescopic rods are fixedly connected to the lower part of the arc-shaped support plate, and a liquid outlet joint is provided at the bottom of the first hydraulic telescopic rod, and the liquid outlet joint is connected to the corresponding auxiliary support structure through a pipeline.

[0012] Preferably, the auxiliary support structure includes a fixed plate fixedly connected to the support leg, the lower surface of the fixed plate is fixedly connected to the fixed end of the second hydraulic telescopic rod, the output end of the second hydraulic telescopic rod is fixedly connected to the support leg pad, and the liquid outlet joint is connected to the fixed end of the second hydraulic telescopic rod through a pipeline.

[0013] Preferably, a plurality of swing plates are provided on the side of the sliding plate, the swing plates are located above the electric roller, the swing plates are hinged to the side of the sliding plate through torsion springs, an arc-shaped groove is provided at the lower end of the swing plate, and symmetrically arranged support shafts are provided on the outside of the mounting frame. The swing plates are initially tilted, and the arc-shaped grooves correspond to the support shafts.

[0014] A method for hoisting a steel box girder, using the above-mentioned hoisting device for steel box girder construction, comprises the following steps:

[0015] Step 1: Move the support leg to the target position by means of the support pulley;

[0016] Step 2: transport the steel box girder to the bottom of the support frame;

[0017] Step 3: Move the hoist to the top of the steel box girder and connect it to the steel box girder;

[0018] Step 4: Lift the steel box girder and move it to the target position.

[0019] Beneficial effects of the present invention:

[0020] The present invention discloses a hoisting device and method for steel box girder construction. A hoist is used to hoist and lift the steel box girder. When the steel box girder is lifted, the weight of the steel box girder is used to drive the second track to move downward. When the second track moves downward, it squeezes the arc-shaped support plate and the first hydraulic telescopic rod. When the first hydraulic telescopic rod is squeezed, the output end of the second hydraulic telescopic rod is driven to extend. When the output end of the second hydraulic telescopic rod is extended, it drives the outrigger pad to move downward. The outrigger pad is pressed and contacted with the ground, thereby improving the stability of the device during hoisting.

[0021] The present invention discloses a hoisting device and method for steel box girder construction. When the steel box girder is lifted, an electric roller drives a sliding plate and a hoist to move onto a first track. When the electric roller is separated from the second track, an adjusting structure drives the second track to rotate. After the second track rotates, the extrusion surfaces of the second track and the electric roller are replaced, thereby effectively reducing deformation of the second track caused by a large extrusion force on the second track during the lifting process, while improving the durability of the second track and the ease of use of the second track. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 is an axonometric view of the present invention;

[0024] Figure 2 It is a front view of the present invention;

[0025] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of region A;

[0026] Figure 4 for Figure 1 Schematic diagram of the enlarged structure of region B;

[0027] Figure 5 It is a cross-sectional structural schematic diagram of the horizontal plate and the mounting frame of the present invention;

[0028] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the C region;

[0029] Figure 7 It is a schematic diagram of the cross-sectional structure of the installation frame of the present invention;

[0030] Figure 8 for Figure 7 Schematic diagram of the enlarged structure of the D region;

[0031] Fig. 9 It is a schematic cross-sectional structural diagram of the mounting frame when the electric roller of the present invention moves onto the second track;

[0032] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure of the E region;

[0033] Fig.11 This is a schematic diagram of the device of the present invention when hoisting a steel box girder;

[0034] In the figure: 1. support frame; 2. support leg; 3. support pulley; 4. cross plate; 5. first track; 6. sliding plate; 7. hoist; 8. electric roller; 9. mounting frame; 10. mounting slot; 11. second track; 12. arc-shaped support plate; 13. reset spring; 14. rotating shaft; 15. one-way bearing; 16. positioning slot; 17. slider; 18. gear; 19. rack; 20. ball; 21. first hydraulic telescopic rod; 22. liquid outlet joint; 23. fixed plate; 24. leg pad; 25. swing plate; 26. torsion spring; 27. arc-shaped slot; 28. support shaft; 29. ​​second hydraulic telescopic rod. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] In order to improve the overall stability of the gantry when hoisting the steel box girder, as an embodiment of the present invention, Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a hoisting device for steel box girder construction of the present invention comprises two sets of support frames 1 arranged in parallel, the same side of the two sets of support frames 1 is supported by a set of support legs 2, a support pulley 3 is installed at the bottom of the support legs 2, the upper surfaces of the two sets of support frames 1 are fixedly connected with horizontally arranged cross plates 4, both sides of the upper part of the cross plates 4 are provided with symmetrically arranged adjustable track components, a first track 5 with a circular cross section is installed on the cross plates 4, the first track 5 is located between the two sets of adjustable track components, a horizontally arranged sliding plate 6 is provided on the first track 5, a hoist 7 is installed on the upper surface of the sliding plate 6, and a plurality of groups of electric rollers 8 are provided on the lower surface of the sliding plate 6, and the electric rollers 8 are located on the first track 5 and in rolling contact with the first track 5;

[0037] A driving structure is provided in the adjustable track assembly, and auxiliary supporting structures are provided at the lower parts of the two groups of supporting legs 2. The driving structure is used to drive the auxiliary supporting structures.

[0038] During use, when the steel box girder needs to be hoisted, the electric roller 8 drives the sliding plate 6 and the hoist 7 to move on the first track 5. According to the position of the steel box girder, after the electric roller 8 moves a certain distance on the first track 5, the electric roller 8 moves to a set of adjustable track structures. At this time, the hoist 7 is located above the steel box girder, and the steel box girder is fixed by the hoist 7. At the same time, the hoist 7 is driven to drive the steel box girder to move upward. When the steel box girder moves upward, the weight of the steel box girder drives the driving structure to work. When the driving structure works, the corresponding auxiliary support structure is opened, and the auxiliary support structure is relied on to improve the overall stability of the support leg 2 and the support frame 1.

[0039] When the steel box girder is lifted by the hoist 7, the electric roller 8 drives the sliding plate 6 and the hoist 7 to move onto the first track 5. When the electric roller 8 is separated from the adjustable track assembly, the corresponding auxiliary support assembly is reset, and the steel box girder is moved to the bottom of the first track 5 and corresponds to the bridge pier. The steel box girder is driven downward by the hoist 7 and placed on the bridge pier, thereby completing the lifting of the steel box girder, thereby improving the convenience of lifting the steel box girder and the overall stability of the steel box girder during lifting.

[0040] In order to improve the convenience of steel box girder hoisting, for example, Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the present invention also includes that the adjustable track assembly includes a mounting frame 9, a mounting groove 10 is provided in the mounting frame 9, the top of the mounting groove 10 and a side close to the first track 5 are both open, a second track 11 which is horizontally arranged and has a circular cross section is provided in the mounting frame 9, a plurality of groups of arc-shaped support plates 12 are provided at the lower part of the second track 11, and a reset spring 13 is fixedly connected between the lower part of the arc-shaped support plate 12 and the inner wall of the mounting frame 9;

[0041] A driving structure is provided at the lower part of the transverse plate 4, and the upper end of the driving structure is fixedly connected to the lower part of the arc-shaped support plate 12. An adjustment structure is provided at one end of the second track 11 away from the first track 5, and the adjustment structure is used to drive the second track 11 to rotate.

[0042] When in use, the electric roller 8 drives the sliding plate 6 and the hoist 7 to move on the first track 5. According to the position of the steel box girder, after the electric roller 8 moves a certain distance on the first track 5, the electric roller 8 moves to the corresponding second track 11. When the hoist 7 moves above the steel box girder, the steel box girder is hoisted and lifted by the hoist 7. When the steel box girder is lifted, the weight of the steel box girder drives the second track 11 to move downward. When the second track 11 moves downward, it squeezes the arc-shaped support plate 12 and the reset spring 13, thereby driving the driving structure to work. When the driving structure works, it drives the corresponding auxiliary support structure to work, so as to improve the stability of the device during hoisting.

[0043] When the steel box girder is lifted, the electric roller 8 drives the sliding plate 6 and the hoist 7 to move onto the first rail 5. When the electric roller 8 is disengaged from the second rail 11, the reset spring 13 drives the arc support plate 12 and the second rail 11 to move upward. When the second rail 11 moves upward, it drives the adjusting structure to work, and the adjusting structure drives the second rail 11 to rotate. After the second rail 11 rotates, the extrusion surfaces of the second rail 11 and the electric roller 8 are replaced, which effectively reduces the deformation of the second rail 11 caused by the large extrusion force on the second rail 11 during the lifting process, and at the same time improves the durability of the second rail 11 and the ease of use of the second rail 11.

[0044] It should be pointed out that the electric roller 8 should be a roller with grooves to match the shapes of the first track 5 and the second track 11 .

[0045] In order to adjust the extrusion surface between the second track 11 and the electric roller 8, for example, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, the present invention also includes that the adjustment structure includes a rotating shaft 14, the rotating shaft 14 is located at the end of the second track 11 away from the first track 5, the rotating shaft 14 is connected to one end of the second track 11 through a one-way bearing 15, a vertically arranged positioning groove 16 is provided on the inner side of the mounting frame 9, and a slider 17 is rotatably connected to the end of the rotating shaft 14 away from the second track 11, the slider 17 is slidably connected to the positioning groove 16, a gear 18 is fixedly connected to the rotating shaft 14, a vertically arranged rack 19 is provided on the inner wall of the mounting frame 9, and the gear 18 is meshed with the rack 19 for transmission.

[0046] When in use, after the electric roller 8 is separated from the second track 11, the arc-shaped support plate 12 and the second track 11 are driven upward by the reset spring 13. When the second track 11 is moved upward, the slider 17 is driven to slide in the positioning groove 16 by the rotating shaft 14. At the same time, when the rotating shaft 14 is moved upward, the gear 18 and the rack 19 are meshed and transmitted, and the second track 11 is driven to rotate by the action of the one-way bearing 15, so as to adjust the extrusion surface between the second track 11 and the electric roller 8, and at the same time, the use time of the second track 11 is increased;

[0047] When the electric roller 8 is squeezed and contacted with the second track 11 again, and the steel box girder is lifted by the hoist 7, the second track 11 is driven downward by the weight of the steel box girder. When the second track 11 moves downward, the gear 18 and the rack 19 are meshed and transmitted. At this time, relying on the effect of the one-way bearing 15, the gear 18 cannot drive the second track 11 to rotate. At the same time, the sliding block 17 slides in the positioning groove 16 to improve the downward stability of the second track 11, thereby facilitating the lifting of the steel box girder.

[0048] For example, Figure 8 As shown, the present invention further includes that a plurality of groups of balls 20 are installed on the inner side of the arc-shaped support plate 12 , and the balls 20 are in rolling contact with the second track 11 .

[0049] During use, after the electric roller 8 is disengaged from the second track 11, the return spring 13 drives the second track 11 to move upward, and at the same time, the gear 18 and the rack 19 engage to drive the second track 11 to rotate. When the second track 11 rotates, the second track 11 rolls in contact with the ball 20, thereby improving the rotation stability and convenience of the second track 11.

[0050] In order to facilitate the operation of the auxiliary support structure, for example, Figure 5 , Figure 6 , Fig. 9 , Fig.10 As shown, the present invention also includes that the driving structure includes a plurality of groups of first hydraulic telescopic rods 21, the fixed ends of the first hydraulic telescopic rods 21 are fixedly connected to the lower surface of the cross plate 4, the output ends of the first hydraulic telescopic rods 21 pass through the cross plate 4 and the mounting frame 9 and are slidably connected to the cross plate 4 and the mounting frame 9, the output ends of the first hydraulic telescopic rods 21 are fixedly connected to the lower part of the arc-shaped support plate 12, and the bottom of the first hydraulic telescopic rod 21 is provided with a liquid outlet joint 22, which is connected to the corresponding auxiliary support structure through a pipeline.

[0051] When in use, the steel box girder is hoisted and lifted by the hoist 7. When the steel box girder is lifted, the weight of the steel box girder drives the second track 11 to move downward. When the second track 11 moves downward, the arc-shaped support plate 12 and the return spring 13 are squeezed, and the first hydraulic telescopic rod 21 is squeezed at the same time. When the first hydraulic telescopic rod 21 is squeezed, it is connected with the auxiliary support structure by the pipeline, so as to drive the auxiliary support structure to work. When the auxiliary support structure works, the overall stability of the support frame 1 can be improved;

[0052] When the steel box girder is lifted, the electric roller 8 drives the sliding plate 6 and the hoist 7 to move onto the first track 5. When the electric roller 8 is separated from the second track 11, the reset spring 13 drives the arc support plate 12 and the second track 11 to move upward, and the first hydraulic telescopic rod 21 is no longer squeezed. At the same time, the auxiliary support structure is reset, so that the corresponding auxiliary support structure can be automatically opened according to the hoisting position of the steel box girder, thereby improving the overall stability.

[0053] For example, Figure 1 , Figure 2 , Fig.11 As shown, the present invention also includes that the auxiliary support structure includes a fixed plate 23 fixedly connected to the support leg 2, the lower surface of the fixed plate 23 is fixedly connected to the fixed end of the second hydraulic telescopic rod 29, the output end of the second hydraulic telescopic rod 29 is fixedly connected to the support leg pad 24, and the liquid outlet joint 22 is connected to the fixed end of the second hydraulic telescopic rod 29 through a pipeline.

[0054] During use, when the first hydraulic telescopic rod 21 is squeezed, it is connected to the second hydraulic telescopic rod 29 through a pipeline, and at the same time, the output end of the second hydraulic telescopic rod 29 is driven to extend. When the output end of the second hydraulic telescopic rod 29 extends, it drives the outrigger pad 24 to move downward, and the outrigger pad 24 is squeezed and contacted with the ground, thereby improving the overall stability.

[0055] In order to facilitate the electric roller 8 to move to the second track 11, illustratively, as Figure 1 , Figure 3 , Figure 4 As shown, the present invention also includes that a plurality of swing plates 25 are provided on the side of the sliding plate 6, the swing plates 25 are located above the electric roller 8, the swing plates 25 are hinged to the side of the sliding plate 6 through torsion springs 26, an arc-shaped slot 27 is provided at the lower end of the swing plate 25, and a symmetrically arranged support shaft 28 is provided on the outer side of the mounting frame 9. The swing plates 25 are initially tilted, and the arc-shaped slot 27 corresponds to the support shaft 28.

[0056] When in use, when the steel box beam needs to be hoisted, according to the position of the steel box beam, the electric roller 8 drives the sliding plate 6 and the hoist 7 to move on the first track 5. When the sliding plate 6 moves to the specified position, the arc-shaped slots 27 of a group of swing plates 25 are engaged with the support shaft 28. As the electric roller 8 drives the sliding plate 6 to continue to move, the swing plate 25 swings around the support shaft 28, thereby tilting one side of the sliding plate 6. The swing plate 25 drives the electric roller 8 and one side of the sliding plate 6 to move upward, thereby facilitating the group of electric rollers 8 to move to the second track 11.

[0057] At the same time, as the electric roller 8 continues to move, the swing plate 25 is separated from the support shaft 28, and as the electric roller 8 moves on the second track 11, the arc-shaped slots 27 on another set of swing plates 25 are engaged with the support shaft 28, thereby driving another set of electric rollers 8 and the other side of the sliding plate 6 to move upward again, so as to facilitate another set of electric rollers 8 to move onto the second track 11, so as to facilitate several sets of electric rollers 8 to move onto the second track 11, and hoist the steel box girder;

[0058] When the steel box girder is lifted, the weight of the steel box girder drives the second track 11 to move downward. After the corresponding second track 11 moves downward, the first track 5 corresponds to the second track 11 and relies on the electric roller 8 to reset and move toward the first track 5. During the movement of the electric roller 8, the side of the swing plate 25 is first squeezed and contacted with the support shaft 28, and the swing plate 25 is driven to swing by the torsion spring 26, so that the swing plate 25 passes over the support shaft 28, so that it is convenient for the electric roller 8 to drive the sliding plate 6 and the hoist 7 to move onto the first track 5. When the electric roller 8 moves to a suitable position on the first track 5, the hoist 7 drives the steel box girder to move downward and places the steel box girder on the pier, thereby completing the hoisting of the steel box girder, thereby improving the convenience of hoisting the steel box girder.

[0059] It should be pointed out that the position of the swing plate 25 of the present invention needs to be adjusted according to the lifting position of the steel box girder to ensure that the swing plate 25 is inclined toward the lifting position of the steel box girder.

[0060] A method for hoisting a steel box girder, using the above-mentioned hoisting device for steel box girder construction, comprises the following steps:

[0061] Step 1: Move the support leg to the target position by means of the support pulley;

[0062] Step 2: transport the steel box girder to the bottom of the support frame;

[0063] Step 3: Move the hoist to the top of the steel box girder and connect it to the steel box girder;

[0064] Step 4: Lift the steel box girder and move it to the target position.

[0065] When the present invention is in use, when it is necessary to hoist the steel box beam, the swing plate 25 is adjusted to tilt toward the lifting position of the steel box beam according to the hoisting position of the steel box beam, and the electric roller 8 drives the sliding plate 6 and the hoist 7 to move on the first track 5. When the sliding plate 6 moves to the specified position, the arc-shaped slots 27 of a group of swing plates 25 are engaged with the support shaft 28. As the electric roller 8 drives the sliding plate 6 to continue to move, the swing plate 25 swings around the support shaft 28, thereby tilting one side of the sliding plate 6, and the electric roller 8 is driven by the swing plate 25 to move. and one side of the sliding plate 6 moves up, so as to facilitate one group of electric rollers 8 to move onto the second track 11; at the same time, as the electric rollers 8 continue to move, the swing plate 25 is separated from the support shaft 28, and as the electric rollers 8 move on the second track 11, the arc-shaped slots 27 on the other group of swing plates 25 are engaged with the support shaft 28, thereby driving another group of electric rollers 8 and the other side of the sliding plate 6 to move up again, so as to facilitate another group of electric rollers 8 to move onto the second track 11, so as to facilitate several groups of electric rollers 8 to move onto the second track 11;

[0066] The electric roller 8 moves to the corresponding second track 11, and the hoist 7 moves to the top of the steel box girder. The hoist 7 is used to lift the steel box girder. When the steel box girder is lifted, the weight of the steel box girder drives the second track 11 to move downward. When the second track 11 moves downward, the arc-shaped support plate 12 and the return spring 13 are squeezed, and the first hydraulic telescopic rod 21 is squeezed. When the first hydraulic telescopic rod 21 is squeezed, it is connected with the second hydraulic telescopic rod 29 through a pipeline, and the output end of the second hydraulic telescopic rod 29 is driven to extend. When the output end of the second hydraulic telescopic rod 29 is extended, the leg pad 24 is driven to move downward, and the leg pad 24 is squeezed and contacted with the ground, thereby improving the overall stability.

[0067] When the steel box girder is lifted, it is reset and moved toward the first track 5 by the electric roller 8. During the movement of the electric roller 8, the side of the swing plate 25 is first pressed and contacted with the support shaft 28, and the swing plate 25 is driven to swing by the torsion spring 26, so that the swing plate 25 passes over the support shaft 28, so that the electric roller 8 drives the sliding plate 6 and the hoist 7 to move onto the first track 5;

[0068] When the electric roller 8 is separated from the second track 11, the return spring 13 drives the arc-shaped support plate 12 and the second track 11 to move upward. When the second track 11 moves upward, the rotating shaft 14 drives the slider 17 to slide in the positioning groove 16. At the same time, when the rotating shaft 14 moves upward, the gear 18 and the rack 19 are meshed and transmitted, and the second track 11 is driven to rotate by the action of the one-way bearing 15. After the second track 11 rotates, the extrusion surface of the second track 11 and the electric roller 8 is replaced, which effectively reduces the deformation of the second track 11 caused by the large extrusion force on the second track 11 during the lifting process, and at the same time improves the durability of the second track 11 and the convenience of use of the second track 11;

[0069] When the electric roller 8 moves to a suitable position on the first track 5, the hoist 7 drives the steel box girder downward and places the steel box girder on the bridge pier, thereby completing the lifting of the steel box girder, thereby improving the convenience of lifting the steel box girder.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hoisting device for steel box girder construction, characterized in that: The invention comprises two sets of support frames (1) arranged in parallel, wherein the same side of the two sets of support frames (1) is supported by a set of support legs (2), a support pulley (3) is installed at the bottom of the support legs (2), the upper surfaces of the two sets of support frames (1) are fixedly connected to a horizontally arranged transverse plate (4), both sides of the upper part of the transverse plate (4) are provided with symmetrically arranged adjustable track components, a first track (5) with a circular cross section is installed on the transverse plate (4), the first track (5) is located between the two sets of adjustable track components, a horizontally arranged sliding plate (6) is provided on the first track (5), a hoist (7) is installed on the upper surface of the sliding plate (6), and a plurality of groups of electric rollers (8) are provided on the lower surface of the sliding plate (6), the electric rollers (8) are located on the first track (5) and are in rolling contact with the first track (5); a driving structure is provided in the adjustable track component, and an auxiliary supporting structure is provided at the lower part of the two sets of support legs (2), and the driving structure is used to drive the auxiliary supporting structure; The adjustable track components all comprise a mounting frame (9), a mounting groove (10) being provided in the mounting frame (9), the top of the mounting groove (10) and a side close to the first track (5) being both open, a second track (11) being horizontally arranged and having a circular cross section being provided in the mounting frame (9), a plurality of groups of arc-shaped support plates (12) being provided at the lower part of the second track (11), a return spring (13) being fixedly connected between the lower part of the arc-shaped support plate (12) and the inner wall of the mounting frame (9); a driving structure being provided at the lower part of the transverse plate (4), the upper end of the driving structure being fixedly connected to the lower part of the arc-shaped support plate (12), an adjustment structure being provided at one end of the second track (11) away from the first track (5), the adjustment structure being used to drive the second track (11) to rotate; The adjustment structure comprises a rotating shaft (14), the rotating shaft (14) being located at an end of the second track (11) away from the first track (5), the rotating shaft (14) being connected to one end of the second track (11) via a one-way bearing (15), a vertically arranged positioning groove (16) being provided on the inner side of the installation frame (9), a sliding block (17) being rotatably connected to the end of the rotating shaft (14) away from the second track (11), the sliding block (17) being slidably connected to the positioning groove (16), a gear (18) being fixedly connected to the rotating shaft (14), a vertically arranged rack (19) being provided on the inner wall of the installation frame (9), and the gear (18) and the rack (19) being meshed for transmission.

2. A hoisting device for steel box girder construction according to claim 1, characterized in that: A plurality of groups of balls (20) are installed on the inner side of the arc-shaped support plate (12), and the balls (20) are in rolling contact with the second track (11).

3. A hoisting device for steel box girder construction according to claim 2, characterized in that: The driving structure comprises a plurality of groups of first hydraulic telescopic rods (21), the fixed ends of the first hydraulic telescopic rods (21) are fixedly connected to the lower surface of the transverse plate (4), the output ends of the first hydraulic telescopic rods (21) pass through the transverse plate (4) and the mounting frame (9) and are slidably connected to the transverse plate (4) and the mounting frame (9), the output ends of the first hydraulic telescopic rods (21) are fixedly connected to the lower part of the arc-shaped support plate (12), and the bottom of the first hydraulic telescopic rods (21) is provided with a liquid outlet joint (22), and the liquid outlet joint (22) is connected to the corresponding auxiliary support structure through a pipeline.

4. A hoisting device for steel box girder construction according to claim 3, characterized in that: The auxiliary support structure comprises a fixing plate (23) fixedly connected to the support leg (2); the lower surface of the fixing plate (23) is fixedly connected to the fixed end of the second hydraulic telescopic rod (29); the output end of the second hydraulic telescopic rod is fixedly connected to the support leg pad (24); and the liquid outlet joint (22) is connected to the fixed end of the second hydraulic telescopic rod (29) through a pipeline.

5. A hoisting device for steel box girder construction according to claim 4, characterized in that: A plurality of swing plates (25) are provided on the side of the sliding plate (6). The swing plates (25) are located above the electric roller (8). The swing plates (25) are hinged to the side of the sliding plate (6) via torsion springs (26). An arc-shaped slot (27) is provided at the lower end of the swing plate (25). A symmetrically arranged support shaft (28) is provided on the outer side of the mounting frame (9). The swing plates (25) are initially arranged in an inclined state, and the arc-shaped slot (27) corresponds to the support shaft (28).

6. A method for hoisting a steel box girder, using a hoisting device for steel box girder construction according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Move the support leg (2) to the target position by means of the support pulley (3); Step 2: transport the steel box girder to the bottom of the support frame (1); Step 3, move the hoist (7) above the steel box girder and connect it to the steel box girder; Step 4: Lift the steel box girder and move it to the target position.

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