Gantry crane for lifting overweight steel box girder and construction method thereof

Abstract

The invention discloses a gantry crane for lifting an overweight steel box girder and a construction method thereof, the gantry crane comprises a first support frame and a second support frame, the first support frame is arranged on one side of the second support frame, sliding cross beams are fixedly mounted at the upper ends of the first support frame and the second support frame, and hoisting devices are movably mounted on the inner sides of the sliding cross beams; the hoisting device comprises a hoister, a sliding clamping seat, a fixed clamping plate, a rotary table and a hoisting frame, the hoisting device is fixedly installed on the outer surface of the upper end of the sliding clamping seat, the fixed clamping plate is fixedly installed on the outer surface of the lower end of the sliding clamping seat, the rotary table is arranged on the lower portion of the sliding clamping seat, and the hoisting frame is movably installed on the outer surface of the lower end of the rotary table. The lifting frame and the rotary table are movably connected through a butt joint shaft; the steel box girder hoisting and moving device is provided with a fixed hoisting and moving structure, the phenomenon that the steel box girder shakes during moving is avoided, meanwhile, the stability of the steel box girder during hoisting and moving operation is improved, and butt joint installation operation can be rapidly completed.

Description

Technical Field

[0001] The invention belongs to the field related to bridge construction technology, and more specifically relates to a gantry crane for lifting an overweight steel box girder and a construction method thereof. Background Art

[0002] The gantry crane for lifting super-heavy steel box girders is a device used to lift the steel box girder structure of the bridge during the erection operation. The steel box girder, also known as the steel plate box girder, is a commonly used structural form for large-span bridges. 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 special-shaped bridge deck composed of a cover plate and longitudinal stiffening ribs.

[0003] The patent document recorded in publication number CN115594065B discloses a steel box girder lifting equipment, including: a lifting ring; a first beam body, a through hole is provided in the center, and lifting points are provided at the four corners of the top surface, and each lifting point is connected to the lifting ring through a steel wire rope; a second beam body, which is horizontally rotated and arranged on the top surface of the first beam body; a third beam body, which is arranged directly below the second beam body; a vertical pole, which is vertically arranged in the through hole, and the upper and lower ends are respectively connected to the second beam body and the third beam body; three telescopic mechanisms, which are vertically arranged in the through hole at intervals, the upper end of each telescopic mechanism is connected to the second beam body, and the lower end is slidably hinged to the third beam body, and the three telescopic mechanisms and the vertical pole are arranged in a matrix with the center point of the second beam body as the center.

[0004] The above-mentioned equipment has certain deficiencies when performing steel box girder hoisting operations. The above-mentioned equipment uses a steel cable structure to hoist the steel box girder and completes the transfer of the steel box girder through a gantry. Affected by the weight of the steel box girder itself, when the steel box girder moves to the specified position, the steel box girder and its upper cable structure will swing. Only when the steel box girder is in a stable state can it be docked and installed, which reduces the installation efficiency of the steel box girder and fails to achieve stable transfer of the steel box girder; secondly, when the above-mentioned equipment performs steel box girder hoisting operations, the hoisted steel box girder is prone to tilting, and during the steel box girder installation operation, the steel box girder needs to be horizontally calibrated, and the installation equipment itself cannot complete the horizontal adjustment operation of the steel box girder, which increases the difficulty of installing the steel box girder; at the same time, steel box girders of different specifications have different sizes, and the above-mentioned equipment cannot flexibly apply to steel box girder structures of different sizes, which reduces the scope of use of the installation equipment and fails to quickly complete the hoisting operations of steel box girders of different specifications. Summary of the invention

[0005] The purpose of the present invention is to provide a gantry crane for lifting an overweight steel box girder and a construction method thereof, which can solve the existing problems.

[0006] The problem to be solved by the present invention is:

[0007] 1. The above equipment uses a steel cable structure to lift the steel box girder and completes the transfer of the steel box girder through a gantry. Affected by the weight of the steel box girder itself, when the steel box girder moves to the designated position, the steel box girder and its upper steel cable structure will swing. Only when the steel box girder is in a stable state can it be docked and installed, which reduces the installation efficiency of the steel box girder and cannot achieve stable transfer of the steel box girder;

[0008] 2. When the above equipment is used to hoist the steel box girder, the hoisted steel box girder is prone to tilt. When the steel box girder is installed, it is necessary to calibrate the steel box girder horizontally. The installation equipment itself cannot complete the horizontal adjustment operation of the steel box girder, which increases the difficulty of installing the steel box girder.

[0009] 3. At the same time, steel box girders of different specifications have different sizes. The above equipment cannot be flexibly applied to steel box girder structures of different sizes, which reduces the use scope of the installation equipment and cannot quickly complete the lifting operation of steel box girders of different specifications.

[0010] The purpose of the present invention can be achieved through the following technical solutions:

[0011] A gantry crane for lifting an overweight steel box girder comprises a first support frame and a second support frame, the first support frame is arranged at one side of the second support frame, and the upper ends of the first support frame and the second support frame are fixedly installed with a sliding beam, and a hoist is movably installed on the inner side of the sliding beam; the hoist comprises a hoist, a sliding card seat, a fixed card plate, a turntable and a lifting frame, the lifting frame is fixedly installed on the upper end outer surface of the sliding card seat, the fixed card plate is fixedly installed on the lower end outer surface of the sliding card seat, the turntable is arranged at the lower part of the sliding card seat, and the lifting frame is movably installed on the lower end outer surface of the turntable, the lifting frame and the turntable are movably connected by a docking shaft, and the upper end outer surface of the lifting frame is located on both sides of the turntable. The fixed card head is fixedly installed, and the bottom of the fixed card plate is provided with a groove for matching with the docking card head.

[0012] As a further technical solution of the present invention, the sliding card seat is movably installed on the inner side of the sliding beam, and the inner side of the sliding beam is provided with a transverse slide rail used in conjunction with the sliding card seat. An electric control buckle is installed in the groove of the fixed card plate. The sliding card seat can move along the transverse slide rail, and the position of the hoist is adjusted by the sliding card seat. When the lifting frame completes the fixing operation of the steel box girder structure of the bridge, the lifting frame drives the steel box girder upward with a lifting cable. When the lifting frame rises to the top position, the docking card head is inserted into the docking card head groove at the bottom of the fixed card plate. The electric control buckle uses a motor to drive the screw rod for telescopic control, so that the electric control buckle and the docking card head are docked and fixed, so that the lifting frame is fixed to the lower end of the fixed card plate, thereby preventing the lifting frame and the steel box girder from swinging during movement.

[0013] As a further technical solution of the present invention, a gear is provided at one end of the docking shaft, two sets of hangers are movably installed at the lower part of the lifting frame, and two lifting cables are installed at the lower end of the hoist. The two lifting cables both pass through the sliding clamp and the fixed clamp. The hoist can be used to complete the independent winding and releasing operations of the two lifting cables, so that the lifting frame is driven up and down by the lifting cables, and the gear is driven by the motor to drive the docking shaft to rotate. The docking shaft drives the hoist to rotate, so as to complete the rotation adjustment of the steel box girder.

[0014] As a further technical solution of the present invention, two winding rods are movably installed inside the hoist, and a motor is provided at one end of the two winding rods. The upper end of the lifting cable and the winding rod are fixedly connected. The two winding rods can be independently controlled by two sets of motors, so that the two lifting cables can be independently raised and lowered. By raising and lowering the two lifting cables, the lifting frame and the steel box girder can be tilted to one side or the other.

[0015] As a further technical solution of the present invention, the hanging bracket includes two groups of movable slides and a bidirectional screw rod. The bidirectional screw rod is movably installed in the middle position of the upper end of the two groups of movable slides, and the middle position of the upper end of the two groups of movable slides is provided with a threaded slider used in conjunction with the bidirectional screw rod. The lower ends of the two groups of movable slides are provided with two groups of hooks. In order to meet the hoisting operations of steel box girders of different sizes, the bidirectional screw rod is driven by a motor, so that the bidirectional screw rod drives the two groups of movable slides to move toward each other, thereby adjusting the positions of the two groups of hooks.

[0016] As a further technical solution of the present invention, a movable slider is provided at the upper end of the hook, and the movable slider is movably installed on the inner side of the movable slide. A fastening bolt is movably installed on the upper end of the movable slide. By adjusting the position of the movable slider in the movable slide, the position of the hook can be adjusted at the lower end of the movable slide, thereby completing the double position adjustment of the hook.

[0017] As a further technical solution of the present invention, a moving base is installed on one side of the first support frame and the second support frame, a splicing slide rail is installed at the lower part of the moving base, a supporting slide is provided on the side of the moving base, the moving base and the supporting slide are fixed by a fixing frame, both ends of the supporting slide are provided with a transverse push rod, and one end of the transverse push rod is installed with a longitudinal push rod, the supporting slide can be used to improve the stability of the first support frame and the second support frame during the moving operation, when the moving base drives the first support frame and the second support frame to move to the specified position by the electric roller at the bottom of the moving base, the transverse push rods at both ends of the moving base extend outward, and at the same time drive the longitudinal push rod to move downward, so that the lower end of the longitudinal push rod contacts the ground.

[0018] As a further technical solution of the present invention, a steering cable is provided below the hoisting cable, and a steering disk is provided between the hoisting cable and the steering cable. Both ends of the steering cable are fixedly connected to the lifting frame. The steering disk can be used to adjust the length of both ends of the steering cable, so that the steering cable can adjust the inclination angle of the lifting frame forward and backward.

[0019] As a further technical solution of the present invention, the outer surface of the steering cable is sleeved with a friction sleeve, and two groups of limit clamping wheels and a group of driving wheels are movably installed on the inner side of the steering disk. The steering cable is clamped between the two groups of limit clamping wheels and a group of driving wheels. The friction sleeve can increase the friction force between the driving wheel and the steering cable, so that the driving wheel can drive the steering cable to move.

[0020] A construction method of a gantry crane for lifting an overweight steel box girder comprises the following steps:

[0021] Step 1: Use the mobile base to drive the first support frame and the second support frame, so that the first support frame and the second support frame drive the hoist to move, move the hoist to the top of the bridge steel box girder, release the hoisting cable through the hoist, so that the hoisting cable drives the hoist to move downward, fix the hook to the upper end of the steel box girder, move the hoist upward with the hoisting cable, and fix the hoist to the lower end of the sliding beam through the electric control buckle and the docking clamp;

[0022] Step 2: Move the hoist to the corresponding position, lower the hoist through the lifting cable, use the driving wheel of the steering disk to drive the steering cable to move, complete the front and rear tilt adjustment of the hoist and the steel box girder, and use the two winding rods to control the winding or releasing operation of the lifting cable respectively, so as to adjust the height of the two ends of the hoist and the steel box girder, and complete the horizontal adjustment of the hoist and the steel box girder.

[0023] Beneficial effects of the present invention:

[0024] 1. By setting a fixed card plate and a mobile base, when the gantry crane for lifting the overweight steel box girder is used, it has a fixed lifting and moving structure to avoid the shaking of the steel box girder when it moves, and at the same time improve the stability of the steel box girder during the lifting and moving operation, so that it can quickly complete the docking and installation operation;

[0025] During operation, first use the mobile base to drive the first support frame and the second support frame, so that the first support frame and the second support frame drive the hoist to move, and move the hoist to the top of the bridge steel box girder, release the lifting cable through the two sets of winding rods of the hoist, so that the lifting cable drives the hoist to move downward, and fix the hook to the upper end of the steel box girder, and drive the winding rod to rotate by the motor to make the winding rod reel in the lifting cable, and use the lifting cable to move the hoist upward, when the lifting frame rises to the top position, the docking card is inserted into the docking card groove at the bottom of the fixed card plate, and the electric control buckle uses the motor to drive the lead screw to perform telescopic control, so that the electric control buckle and the docking card are docked and fixed, so that the lifting frame is fixed on the fixed card At the lower end of the plate, the mobile base is used to drive the first support frame and the second support frame, so that the first support frame and the second support frame move along the spliced ​​slide rail, and the fixed lifting frame fixes the steel box girder to the bottom of the sliding beam to avoid swinging of the lifting frame and the steel box girder during movement, thereby realizing fixed mobile lifting of the steel box girder. When the mobile base uses the electric roller at its bottom to drive the first support frame and the second support frame to move to the specified position, the horizontal push rods at both ends of the mobile base extend outward, and at the same time drive the longitudinal push rod to move downward, so that the lower end of the longitudinal push rod contacts the ground, which plays an auxiliary supporting role between the mobile base and the ground, and improves the stability of the steel box girder during installation.

[0026] 2. By arranging a steering plate and two winding rods, when the gantry crane for lifting the super-heavy steel box girder and the construction method thereof are used, the gantry crane has a steel box girder hoisting horizontal adjustment structure, which can automatically complete the horizontal adjustment of the steel box girder and improve its installation effect;

[0027] When in use, two sets of motors can be used to independently control the two winding rods, so that the two lifting cables can be independently raised and lowered. When one lifting cable rises and the other lifting cable falls, the lifting frame and the steel box girder tilt to one side. When one lifting cable falls and the other lifting cable rises, the lifting frame and the steel box girder tilt to the other side. By utilizing the lifting and lowering adjustment of the two lifting cables, the lifting frame and the steel box girder can be tilted to one side or the other. Secondly, the steering disk can be used to adjust the length of both ends of the steering cable, so that the steering cable can adjust the inclination angle of the lifting frame forward and backward. During operation, the motor is used to drive the driving wheel to rotate, so that the driving wheel controls the length of both ends of the steering cable. The friction sleeve can increase the friction between the driving wheel and the steering cable, so that the driving wheel can drive the steering cable to move, thereby realizing the front and rear adjustment of the lifting frame and the steel box girder, so that the lifting frame and the steel box girder are adjusted to a horizontal state, which is convenient for the installation operation of the steel box girder.

[0028] 3. By setting the hanging frame, when the gantry crane for lifting the super-heavy steel box girder is used, it can be flexibly applied to steel box girder structures of different specifications, thereby improving its scope of application;

[0029] During operation, in order to meet the lifting operation of steel box girders of different sizes, a motor is used to drive a bidirectional screw rod, so that the bidirectional screw rod drives a threaded slider, thereby driving two sets of mobile slides to move toward each other, adjusting the positions of the two sets of hooks, and utilizing the position adjustment of the mobile slider in the mobile slide to adjust the position of the hook at the lower end of the mobile slide, thereby completing the double position adjustment of the hook, making it convenient for docking and fixing steel box girders of different specifications. A motor is used to drive the gear, so that the gear drives the docking shaft to rotate, and the docking shaft drives the hoist to rotate, thereby completing the rotation adjustment of the steel box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1 It is a schematic diagram of the overall structure of a gantry crane for lifting an overweight steel box girder according to the present invention;

[0032] Figure 2 It is a partial structural diagram of a gantry crane for lifting an overweight steel box girder of the present invention;

[0033] Figure 3 This is the overall structural diagram of a gantry crane middle bracket for lifting an overweight steel box girder of the present invention;

[0034] Figure 4 This is an overall structural diagram of a movable base in a gantry crane for lifting an overweight steel box girder according to the present invention;

[0035] Figure 5 This is a diagram of the internal structure of a steering plate in a gantry crane for lifting an overweight steel box girder according to the present invention;

[0036] Figure 6 The present invention is an overall structural diagram of a supporting slide in a gantry crane for lifting an overweight steel box girder.

[0037] In the figure: 1. first support frame; 2. second support frame; 3. sliding beam; 4. mobile base; 5. splicing slide rail; 6. hoist; 7. hoist; 8. electric control buckle; 9. lifting cable; 10. docking clamp; 11. lifting frame; 12. docking shaft; 13. turntable; 14. hanging frame; 15. steering plate; 16. transverse slide rail; 17. sliding clamp seat; 18. winding rod; 19. mobile slide; 20. hook; 21. threaded slider; 22. two-way screw; 23. supporting slide; 24. fixed frame; 25. transverse push rod; 26. longitudinal push rod; 27. limit clamp wheel; 28. driving wheel; 29. ​​friction sleeve; 30. steering cable; 31. fixed clamp plate; 32. fastening bolt; 33. mobile slider. DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0039] like Figure 1 As shown, a gantry crane for lifting an overweight steel box girder and a construction method thereof, comprises a first support frame 1 and a second support frame 2, the first support frame 1 is arranged on one side of the second support frame 2, and the upper ends of the first support frame 1 and the second support frame 2 are fixedly installed with a sliding crossbeam 3, and the inner side of the sliding crossbeam 3 is movably installed with a hoist 6; the hoist 6 comprises a hoist 7, a sliding card seat 17, a fixed card plate 31, a turntable 13 and a lifting frame 11, the lifting frame 6 is fixedly installed on the upper end outer surface of the sliding card seat 17, the fixed card plate 31 is fixedly installed on the lower end outer surface of the sliding card seat 17, the turntable 13 is arranged at the lower part of the sliding card seat 17, the lifting frame 11 is movably installed on the lower end outer surface of the turntable 13, the lifting frame 11 and the turntable 13 are movably connected through a docking shaft 12, the upper end outer surface of the lifting frame 11 is located on both sides of the turntable 13 and fixedly installed with docking clamps 10, and the bottom of the fixed card plate 31 is provided with a groove for matching with the docking clamp 10.

[0040] In order to solve the shaking problem of steel box girder during hoisting, Figure 2 As shown, the sliding seat 17 is movably installed on the inner side of the sliding beam 3, and the inner side of the sliding beam 3 is provided with a transverse slide rail 16 used in conjunction with the sliding seat 17. The electric control buckle 8 is installed in the groove of the fixed card plate 31. The sliding seat 17 can move along the transverse slide rail 16. The position of the hoist 6 is adjusted by the sliding seat 17. When the lifting frame 11 completes the fixing operation of the bridge steel box girder structure, the lifting frame 11 drives the steel box girder to move up by the lifting cable 9. When the lifting frame 11 rises to the top position, the docking clamp head 10 is inserted into the groove of the docking clamp head 10 at the bottom of the fixed card plate 31. The electric control buckle 8 uses a motor to drive the screw rod for telescopic control, so that the electric control buckle 8 is used for docking and fixing between the docking clamp heads 10, so that the lifting frame 11 is fixed to the lower end of the fixed card plate 31 to avoid swinging of the lifting frame 11 and the steel box girder during movement.

[0041] like Figure 2 As shown, a gear is provided at one end of the docking shaft 12, two sets of hangers 14 are movably installed at the lower part of the lifting frame 11, and two lifting cables 9 are installed at the lower end of the hoist 7. The two lifting cables 9 both pass through the sliding clamp 17 and the fixed clamp 31. The hoist 7 can be used to complete the independent winding and releasing operations of the two lifting cables 9, so that the lifting frame 11 is driven up and down by the lifting cables 9, and the gear is driven by the motor to drive the docking shaft 12 to rotate, and the docking shaft 12 drives the hoist 6 to rotate, so as to complete the rotation adjustment of the steel box girder.

[0042] In order to solve the problem of horizontal adjustment during the hoisting of steel box beams, Figure 2 and 5 As shown, two winding rods 18 are movably installed inside the hoist 7, and a motor is provided at one end of the two winding rods 18. The upper end of the hoisting cable 9 and the winding rod 18 are fixedly connected. The two winding rods 18 can be independently controlled by two sets of motors, so that the two hoisting cables 9 can be independently raised and lowered. By raising and lowering the two hoisting cables 9, the lifting frame 11 and the steel box girder can be tilted to one side or the other.

[0043] like Figure 3 As shown, the bracket 14 includes two groups of movable slides 19 and a bidirectional screw rod 22. The bidirectional screw rod 22 is movably installed in the middle position of the upper end of the two groups of movable slides 19, and the middle position of the upper end of the two groups of movable slides 19 is provided with a threaded slider 21 used in conjunction with the bidirectional screw rod 22. The lower ends of the two groups of movable slides 19 are provided with two groups of hooks 20. In order to meet the hoisting operations of steel box girders of different sizes, the bidirectional screw rod 22 is driven by a motor, so that the bidirectional screw rod 22 drives the two groups of movable slides 19 to move toward each other, thereby adjusting the positions of the two groups of hooks 20.

[0044] like Figure 6 As shown, a movable slider 33 is provided at the upper end of the hook 20, and the movable slider 33 is movably installed on the inner side of the movable slide 19. A fastening bolt 32 is movably installed on the upper end of the movable slider 33. By adjusting the position of the movable slider 33 in the movable slide 19, the position of the hook 20 can be adjusted at the lower end of the movable slide 19, thereby completing the double position adjustment of the hook 20.

[0045] like Figure 4 As shown, a moving base 4 is installed on one side of the first support frame 1 and the second support frame 2, a splicing slide rail 5 is installed on the lower part of the moving base 4, a supporting slide 23 is provided on the side of the moving base 4, the moving base 4 and the supporting slide 23 are fixed by a fixing frame 24, both ends of the supporting slide 23 are provided with a transverse push rod 25, and one end of the transverse push rod 25 is installed with a longitudinal push rod 26, the supporting slide 23 can be used to improve the stability of the first support frame 1 and the second support frame 2 during the moving operation, when the moving base 4 uses the electric roller at the bottom thereof to drive the first support frame 1 and the second support frame 2 to move to the specified position, the transverse push rods 25 at both ends of the moving base 4 extend outward, and at the same time drive the longitudinal push rod 26 to move downward, so that the lower end of the longitudinal push rod 26 contacts the ground.

[0046] A steering cable 30 is provided below the suspension cable 9, and a steering disk 15 is provided between the suspension cable 9 and the steering cable 30. Both ends of the steering cable 30 are fixedly connected to the lifting frame 11. The steering disk 15 can be used to adjust the length of both ends of the steering cable 30, so that the steering cable 30 can adjust the inclination angle of the lifting frame 11 forward and backward.

[0047] like Figure 5 As shown, the outer surface of the steering cable 30 is sleeved with a friction sleeve 29, and two groups of limit clamping wheels 27 and a group of driving wheels 28 are movably installed on the inner side of the steering disk 15. The steering cable 30 is clamped between the two groups of limit clamping wheels 27 and a group of driving wheels 28. The friction sleeve 29 can increase the friction between the driving wheels 28 and the steering cable 30, so that the driving wheels 28 can drive the steering cable 30 to move.

[0048] A construction method of a gantry crane for lifting an overweight steel box girder comprises the following steps:

[0049] Step 1: Use the mobile base 4 to drive the first support frame 1 and the second support frame 2, so that the first support frame 1 and the second support frame 2 drive the hoist 6 to move, and move the hoist 6 to the top of the bridge steel box girder, release the hoisting cable 9 through the hoist 7, so that the hoisting cable 9 drives the hoist 6 to move down, fix the hook 20 to the upper end of the steel box girder, move the hoist 6 up by the hoisting cable 9, and fix the hoist 6 to the lower end of the sliding beam 3 by the electric control buckle 8 and the docking clamp 10;

[0050] Step 2: Move the hoist 6 to the corresponding position, lower the hoist 6 via the hoisting cable 9, use the driving wheel 28 of the steering disk 15 to drive the steering cable 30 to move, complete the front and rear tilt adjustment of the hoist 6 and the steel box girder, and use the two winding rods 18 to respectively control the winding or releasing operation of the hoisting cable 9, thereby adjusting the height of the two ends of the hoist 6 and the steel box girder, and completing the horizontal adjustment of the hoist 6 and the steel box girder.

[0051] When in use, traditional equipment uses a steel cable structure to lift the steel box girder and completes the transfer of the steel box girder through a gantry. Affected by the weight of the steel box girder itself, when the steel box girder is moved to the designated position, the steel box girder and its upper steel cable structure will swing. Only when the steel box girder is in a stable state can it be docked and installed, which reduces the installation efficiency of the steel box girder and cannot achieve stable transfer of the steel box girder.

[0052] To this end, by providing a fixed clamping plate 31 and a movable base 4, when the gantry crane for lifting the overweight steel box girder is used, it has a fixed lifting and moving structure to avoid the shaking of the steel box girder when it moves, and at the same time improve the stability of the steel box girder during the lifting and moving operation, so that it can quickly complete the docking and installation operation;

[0053] During operation, firstly, the mobile base 4 is used to drive the first support frame 1 and the second support frame 2, so that the first support frame 1 and the second support frame 2 drive the hoist 6 to move, and the hoist 6 is moved to the top of the bridge steel box girder, and the two sets of winding rods 18 of the hoist 7 are used to release the lifting cable 9, so that the lifting cable 9 drives the lifting device 6 to move downward, and the hook 20 is fixed to the upper end of the steel box girder, and the winding rod 18 is driven by the motor to rotate so that the winding rod 18 reels in the lifting cable 9, and the hoist 6 is moved up by the lifting cable 9. When the lifting frame 11 rises to the top position, the docking card head 10 is inserted into the docking card head 10 groove at the bottom of the fixed card plate 31, and the electric control buckle 8 is controlled by the motor to drive the lead screw for extension and retraction control, so that the electric control buckle 8 and the docking card head 10 are docked and fixed, so that the lifting frame 11 The first support frame 1 and the second support frame 2 are fixed to the lower end of the fixed card plate 31. At this time, the mobile base 4 is used to drive the first support frame 1 and the second support frame 2 to move along the splicing slide rail 5. The fixed lifting frame 11 fixes the steel box girder to the bottom of the sliding beam 3 to prevent the lifting frame 11 and the steel box girder from swinging during movement, thereby realizing fixed mobile lifting of the steel box girder. When the mobile base 4 uses the electric roller at its bottom to drive the first support frame 1 and the second support frame 2 to move to the specified position, the transverse push rods 25 at both ends of the mobile base 4 extend outward and drive the longitudinal push rod 26 to move downward at the same time, so that the lower end of the longitudinal push rod 26 contacts the ground, thereby playing an auxiliary supporting role between the mobile base 4 and the ground, and improving the stability of the steel box girder during installation.

[0054] When traditional equipment is used to hoist steel box girders, the hoisted steel box girders are prone to tilting. During the installation of steel box girders, the steel box girders need to be horizontally calibrated. The installation equipment itself cannot complete the horizontal adjustment of the steel box girders, which increases the difficulty of installing the steel box girders.

[0055] To this end, by providing a steering plate 15 and two winding rods 18, when the gantry crane for lifting the overweight steel box girder and the construction method thereof are used, it is provided with a steel box girder hoisting level adjustment structure, which can automatically complete the level adjustment of the steel box girder and improve its installation effect;

[0056] When in use, two sets of motors can be used to independently control the two winding rods 18, so that the two hoisting cables 9 can be independently raised and lowered. When one hoisting cable 9 rises and the other hoisting cable 9 falls, the hoisting frame 11 and the steel box girder tilt to one side. When one hoisting cable 9 falls and the other hoisting cable 9 rises, the hoisting frame 11 and the steel box girder tilt to the other side. By adjusting the lifting and lowering of the two hoisting cables 9, the hoisting frame 11 and the steel box girder can be tilted to one side or the other. Secondly, the steering plate 15 can be used to adjust the steering cable The length of both ends of the steering cable 30 is such that the steering cable 30 can adjust the tilt angle of the lifting frame 11 forward and backward. During operation, the driving wheel 28 is driven by a motor to rotate, so that the driving wheel 28 controls the length of both ends of the steering cable 30. The friction sleeve 29 can increase the friction between the driving wheel 28 and the steering cable 30, so that the driving wheel 28 can drive the steering cable 30 to move, thereby realizing the front and rear adjustment of the lifting frame 11 and the steel box beam, so that the lifting frame 11 and the steel box beam are adjusted to a horizontal state, which is convenient for the installation operation of the steel box beam;

[0057] At the same time, the steel box girders of different specifications have different sizes. The above equipment cannot be flexibly applied to steel box girder structures of different sizes, which reduces the use scope of the installation equipment and cannot quickly complete the hoisting operation of steel box girders of different specifications;

[0058] To this end, by providing the bracket 14, when the gantry crane for lifting the overweight steel box girder is used, it can be flexibly applied to steel box girder structures of different specifications, thereby improving its scope of application;

[0059] During operation, in order to meet the lifting operation of steel box girders of different sizes, a motor is used to drive the bidirectional screw rod 22, so that the bidirectional screw rod 22 drives the threaded slider 21, thereby driving the two groups of movable slides 19 to move toward each other, and adjusting the positions of the two groups of hooks 20. By adjusting the position of the movable slider 33 in the movable slide 19, the position of the hook 20 can be adjusted at the lower end of the movable slide 19, completing the double position adjustment of the hook 20, and facilitating the docking and fixation of steel box girders of different specifications. By using a motor to drive the gear, the gear drives the docking shaft 12 to rotate, and the docking shaft 12 drives the hoist 6 to rotate, so as to complete the rotation adjustment of the steel box girder.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A gantry crane for lifting an overweight steel box girder, characterized in that: The invention comprises a first support frame (1) and a second support frame (2), wherein the first support frame (1) is arranged on one side of the second support frame (2), and a sliding beam (3) is fixedly installed on the upper end of the first support frame (1) and the second support frame (2), and a hoist (6) is movably installed on the inner side of the sliding beam (3); the hoist (6) comprises a hoist (7), a sliding card seat (17), a fixed card plate (31), a turntable (13) and a lifting frame (11), and the hoist (6) is fixedly installed on the outer surface of the upper end of the sliding card seat (17). The fixed card plate (31) is fixedly mounted on the lower end outer surface of the sliding card seat (17), the turntable (13) is arranged at the lower part of the sliding card seat (17), and the lifting frame (11) is movably mounted on the lower end outer surface of the turntable (13). The lifting frame (11) and the turntable (13) are movably connected via a docking shaft (12), and docking clamps (10) are fixedly mounted on both sides of the upper end outer surface of the lifting frame (11) on the turntable (13), and a groove for cooperating with the docking clamp (10) is provided at the bottom of the fixed card plate (31).

2. A gantry crane for lifting an overweight steel box girder according to claim 1, characterized in that: The sliding card seat (17) is movably installed on the inner side of the sliding beam (3), and the inner side of the sliding beam (3) is provided with a transverse slide rail (16) used in conjunction with the sliding card seat (17), and an electric control buckle (8) is installed in the groove of the fixed card plate (31).

3. The gantry crane for lifting an overweight steel box girder according to claim 1, characterized in that: A gear is provided at one end of the docking shaft (12), two groups of hangers (14) are movably installed at the lower part of the lifting frame (11), and two lifting cables (9) are installed at the lower end of the hoist (7), and both lifting cables (9) pass through the sliding card seat (17) and the fixed card plate (31).

4. The gantry crane for lifting an overweight steel box girder according to claim 1, characterized in that: Two winding rods (18) are movably installed inside the hoist (7), and one end of each winding rod (18) is provided with a motor. The upper end of the suspension cable (9) and the winding rod (18) are fixedly connected.

5. The gantry crane for lifting an overweight steel box girder according to claim 3, characterized in that: The hanger (14) comprises two groups of movable slides (19) and a bidirectional screw rod (22), wherein the bidirectional screw rod (22) is movably mounted at the middle position of the upper ends of the two groups of movable slides (19), and a threaded slider (21) used in conjunction with the bidirectional screw rod (22) is provided at the middle position of the upper ends of the two groups of movable slides (19), and two groups of hooks (20) are provided at the lower ends of the two groups of movable slides (19).

6. The gantry crane for lifting an overweight steel box girder according to claim 5, characterized in that: A movable slider (33) is provided at the upper end of the hook (20), and the movable slider (33) is movably mounted on the inner side of the movable slide (19). A fastening bolt (32) is movably mounted on the upper end of the movable slider (33).

7. The gantry crane for lifting super-heavy steel box beams according to claim 6, characterized in that: A movable base (4) is installed on one side of the first support frame (1) and the second support frame (2); a splicing slide rail (5) is installed at the lower part of the movable base (4); a supporting slide (23) is provided on the side of the movable base (4); the movable base (4) and the supporting slide (23) are fixed by a fixing frame (24); transverse push rods (25) are provided at both ends of the supporting slide (23), and a longitudinal push rod (26) is installed at one end of the transverse push rod (25).

8. The gantry crane for lifting an overweight steel box girder according to claim 3, characterized in that: A steering cable (30) is provided below the suspension cable (9), and a steering disk (15) is provided between the suspension cable (9) and the steering cable (30). Both ends of the steering cable (30) are fixedly connected to the lifting frame (11).

9. The gantry crane for lifting an overweight steel box girder according to claim 8, characterized in that: The outer surface of the steering cable (30) is sleeved with a friction sleeve (29), and two groups of limit clamping wheels (27) and a group of driving wheels (28) are movably installed on the inner side of the steering disc (15), and the steering cable (30) is clamped between the two groups of limit clamping wheels (27) and the group of driving wheels (28).

10. A construction method for a gantry crane for lifting an overweight steel box girder, characterized in that: The following steps are involved: Step 1: Use the mobile base (4) to drive the first support frame (1) and the second support frame (2), so that the first support frame (1) and the second support frame (2) drive the hoist (6) to move, move the hoist (6) to the top of the bridge steel box girder, release the lifting cable (9) through the hoist (7), so that the lifting cable (9) drives the hoist (6) to move downward, fix the hook (20) to the upper end of the steel box girder, use the lifting cable (9) to move the hoist (6), and fix the hoist (6) to the lower end of the sliding beam (3) through the electric control buckle (8) and the docking clamp (10); Step 2: Move the hoist (6) to the corresponding position, lower the hoist (6) through the hoisting cable (9), use the driving wheel (28) of the steering plate (15) to drive the steering cable (30) to move, complete the front and rear tilt adjustment of the hoist (6) and the steel box girder, use the two winding rods (18) to respectively control the winding or releasing operation of the hoisting cable (9), thereby adjusting the height of the two ends of the hoist (6) and the steel box girder, and completing the horizontal adjustment of the hoist (6) and the steel box girder.

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