A gantry crane for lifting an overweight steel box girder and a construction method thereof

Abstract

The application discloses a gantry crane for lifting an overweight steel box girder and a construction method thereof, which 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 installed at the upper ends of the first support frame and the second support frame, and a hoisting device is movably installed at the inner side of the sliding cross beam. The hoisting device comprises an elevator, a sliding clamping seat, a fixed clamping plate, a rotating table and a lifting 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 rotating table is arranged at the lower part of the sliding clamping seat, the lifting frame is movably installed on the outer surface of the lower end of the rotating table, and the lifting frame and the rotating table are movably connected through a butt joint shaft. The gantry crane has a fixed hoisting moving structure, can avoid the shaking of the steel box girder during movement, improve the stability of the lifting and moving operation of the steel box girder and enable the gantry crane to quickly complete butt joint installation operation.

Description

TECHNICAL FIELD

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

[0002] The gantry crane for lifting an overweight steel box girder is a device for hoisting and operating the steel box girder structure of a bridge during bridge erection operation. The steel box girder, also known as a steel plate box girder, is a common structural form of a long-span bridge. The steel box girder is generally connected by full welding of a top plate, a bottom plate, a web plate, a transverse diaphragm, a longitudinal diaphragm and a stiffening rib. The top plate is a rectangular anisotropic bridge deck formed by a cover plate and a longitudinal stiffening rib.

[0003] The patent document with publication number CN115594065B discloses a steel box girder hoisting device, which comprises a lifting ring, a first beam body with a through hole in the center and lifting points at the top corners of the top surface, each lifting point being connected to the lifting ring by a steel wire rope, a second beam body horizontally rotating on the top surface of the first beam body, a third beam body arranged directly below the second beam body, a vertical rod vertically arranged in the through hole and connected to the second beam body at the upper end and to the third beam body at the lower end, and three telescopic mechanisms vertically and spaced apart arranged in the through hole, the upper end of each telescopic mechanism being connected to the second beam body and the lower end being slidingly hinged to the third beam body, the three telescopic mechanisms being arranged in a matrix around the center point of the second beam body.

[0004] The above device has certain deficiencies in steel box girder hoisting operation. The above device uses a steel cable structure to lift the steel box girder and completes the transfer of the steel box girder by a gantry. Affected by the weight of the steel box girder, the steel box girder and the upper end steel cable structure will sway after the steel box girder is moved to the designated position. Only when the steel box girder is in a stable state can the connection and installation be performed, which reduces the installation efficiency of the steel box girder and cannot realize stable transfer of the steel box girder. Secondly, during the steel box girder hoisting operation of the above device, the hoisted steel box girder is prone to tilting. During the installation operation of the steel box girder, the steel box girder needs to be horizontally calibrated. The installation device itself cannot complete the horizontal adjustment operation of the steel box girder, increasing the installation difficulty of the steel box girder. At the same time, different specifications of steel box girders have different sizes. The above device cannot be flexibly applied to steel box girder structures of different sizes, reducing the use range of the installation device and unable to quickly complete the hoisting operation of steel box girders of different specifications. SUMMARY

[0005] The purpose of the present application 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 solved by the present application is:

[0007] 1. The above-mentioned equipment uses a steel cable structure to lift the steel box girder and transfers it through a gantry crane. Due to the weight of the steel box girder itself, the steel box girder and its upper steel cable structure will swing after the steel box girder is moved to the designated position. Only when the steel box girder is in a stable state can the docking installation be carried out, 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-mentioned equipment is used for hoisting steel box girders, the steel box girders are prone to tilting after hoisting. During the installation of steel box girders, it is necessary to level the steel box girders. The installation equipment itself cannot complete the leveling adjustment of the steel box girders, which increases the difficulty of the installation of steel box girders.

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

[0010] The objective of this invention can be achieved through the following technical solutions:

[0011] A gantry crane for lifting heavy-duty steel box girders includes a first support frame and a second support frame. The first support frame is disposed on one side of the second support frame, and a sliding crossbeam is fixedly installed on the upper end of both the first and second support frames. A lifting device is movably installed on the inner side of the sliding crossbeam. The lifting device includes a hoist, a sliding seat, a fixed plate, a turntable, and a lifting frame. The lifting device is fixedly installed on the upper outer surface of the sliding seat, the fixed plate is fixedly installed on the lower outer surface of the sliding seat, the turntable is disposed at the lower part of the sliding seat, and the lifting frame is movably installed on the lower outer surface of the turntable. The lifting frame and the turntable are movably connected by a docking shaft. A docking head is fixedly installed on both sides of the upper outer surface of the lifting frame located on the turntable, and the bottom of the fixed plate is provided with a groove for cooperating with the docking head.

[0012] As a further technical solution of the present invention, the sliding bracket is movably installed on the inner side of the sliding crossbeam, and the inner side of the sliding crossbeam is provided with a transverse slide rail for use with the sliding bracket. An electrically controlled buckle is installed in the groove of the fixed plate. The sliding bracket can move along the transverse slide rail. The position of the hoist is adjusted by the sliding bracket. After the hoist completes the fixing operation of the bridge steel box girder structure, the hoist uses the hoisting cable to drive the steel box girder to move upward. When the hoist rises to the top position, the docking head is inserted into the docking head groove at the bottom of the fixed plate. The electrically controlled buckle is controlled by the extension and retraction of the screw driven by the motor, so that the electrically controlled buckle and the docking head are docked and fixed, so that the hoist is fixed at the lower end of the fixed plate, avoiding the swaying phenomenon of the hoist and the steel box girder when moving.

[0013] As a further technical scheme of the present application, one end of the butt joint shaft is provided with a gear, the lower part of the lifting frame movably installs two groups of hangers, the lower end of the lifting machine is provided with two lifting cables, both of which penetrate through the sliding clamping seat and the fixed clamping plate, and the independent winding and releasing operations of the two lifting cables can be completed by using the lifting machine, so that the lifting frame is driven to move up and down by the lifting cable, and the gear is driven to rotate by the motor, so that the butt joint shaft is driven to rotate by the gear, and the rotation adjustment of the steel box girder can be completed by driving the lifting device to rotate.

[0014] As a further technical scheme of the present application, two winding rods are movably installed in the lifting machine, and a motor is arranged at one end of each winding rod. The upper end of the lifting cable is fixedly connected with the winding rod. Two winding rods can be independently controlled by two groups of motors, so that the two lifting cables are independently adjusted in height. The lifting of the lifting frame and the steel box girder to one side or the other side can be adjusted by the lifting of the two lifting cables.

[0015] As a further technical scheme of the present application, the hanger comprises two groups of movable carriages and a bidirectional screw rod, the bidirectional screw rod is movably installed at the middle part of the upper end of the two groups of movable carriages, and the upper end of the two groups of movable carriages is provided with a threaded block matched with the bidirectional screw rod, and the lower end of the two groups of movable carriages is provided with two groups of hooks. In order to meet the hoisting operation of steel box girders of different sizes, the bidirectional screw rod is driven by the motor, so that the two groups of movable carriages are driven to move towards each other, so as to adjust the position of the two groups of hooks.

[0016] As a further technical scheme of the present application, the upper end of the hook is provided with a movable sliding block, the movable sliding block is movably installed on the inner side of the movable carriage, and the upper end of the movable sliding block is movably installed with a fastening bolt. The position of the movable sliding block in the movable carriage can be adjusted to adjust the position of the hook at the lower end of the movable carriage, and the double position adjustment of the hook can be completed.

[0017] As a further technical scheme of the present application, the first support frame and the second support frame are provided with a movable base on one side, the movable base is provided with a spliced sliding rail at the lower part, the movable base is provided with a supporting sliding seat on the side edge, the movable base and the supporting sliding seat are fixedly connected through the fixed frame, the supporting sliding seat is provided with a transverse jack at both ends, and the transverse jack is provided with a longitudinal jack at one end. The stability of the first support frame and the second support frame during the moving operation can be improved by using the supporting sliding seat. When the movable base drives the first support frame and the second support frame to move to the specified position by using the electric roller at the bottom, the transverse jacks at both ends of the movable base are extended outward, and the longitudinal jack is driven to move downward, so that the lower end of the longitudinal jack is in contact with the ground.

[0018] As a further technical scheme of the present application, the lower part of the cable is provided with a direction adjusting cable, and the direction adjusting cable is fixedly connected with the lifting frame at both ends, and the length of the direction adjusting cable can be adjusted by the direction adjusting disc, so that the inclination angle of the lifting frame can be adjusted.

[0019] As a further technical scheme of the present application, the outer surface of the direction adjusting cable is sleeved with a friction sleeve, the inner side of the direction adjusting disc is movably provided with two sets of limiting clamping wheels and a set of driving wheels, and the direction adjusting cable is clamped between the two sets of limiting clamping wheels and the set of driving wheels, so that the friction sleeve can increase the friction between the driving wheel and the direction adjusting cable, and the driving wheel can drive the direction adjusting cable to move.

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

[0021] Step one, the first support frame and the second support frame are driven by the mobile base to move the lifting device, the lifting device is moved above the bridge steel box girder, the cable is released by the lifting machine, the cable drives the lifting device to move downward, the hook is fixed to the upper end of the steel box girder, the lifting device is moved upward by the cable, and the lifting device is fixed to the lower end of the sliding cross beam by the electric control buckle and the butt joint head;

[0022] Step two, the lifting device is moved to the corresponding position, the lifting device is moved downward by the cable, the driving wheel of the direction adjusting disc drives the direction adjusting cable to move, the front and rear inclination adjustment of the lifting device and the steel box girder is completed, the two winding rods are used to control the winding or releasing operation of the cable respectively, so that the height of the two ends of the lifting device and the steel box girder is adjusted, and the horizontal adjustment of the lifting device and the steel box girder is completed.

[0023] The present application has the following advantages:

[0024] 1. By setting the fixed clamping plate and the mobile base, the fixed lifting moving structure is provided when the gantry crane for lifting the overweight steel box girder is used, the shaking phenomenon of the steel box girder during movement is avoided, the stability of the steel box girder lifting movement operation is improved, and the butt joint installation operation can be quickly completed.

[0025] In operation, first, the mobile base drives the first support frame and the second support frame, so that the first support frame and the second support frame drive the lifting device to move, and the lifting device is moved above the steel box girder of the bridge, the two groups of winding rods of the hoist are released, the lifting cable is driven to move downwards, the hook is fixed to the upper end of the steel box girder, the winding rod is driven to rotate by the motor, the winding rod winds the lifting cable, the lifting device is lifted by the lifting cable, when the lifting frame is lifted to the top position, the butt joint head is inserted into the butt joint head groove at the bottom of the fixed clamping plate, the electric control buckle is controlled to stretch and retract by the motor drive screw, the butt joint head is fixed between the electric control buckle and the butt joint head, and the lifting frame is fixed to the lower end of the fixed clamping plate. At this time, the mobile base drives the first support frame and the second support frame, so that the first support frame and the second support frame move along the splicing slide rail, the fixed lifting frame fixes the steel box girder at the bottom of the sliding cross beam, avoids the swinging phenomenon of the lifting frame and the steel box girder during movement, realizes the fixed type movement of the steel box girder, and realizes the fixed type movement of the steel box girder.

[0026] 2. By setting the steering disc and the two winding rods, the super-heavy steel box girder lifting gantry crane and its construction method have the steel box girder lifting horizontal adjustment structure, can automatically complete the horizontal adjustment of the steel box girder, and improve the installation effect.

[0027] In use, the two groups of motors can independently control the two winding rods, so that the two lifting cables are independently adjusted in lifting, when one lifting cable rises and the other lifting cable descends, the lifting frame and the steel box girder tilt to one side, when one lifting cable descends and the other lifting cable rises, the lifting frame and the steel box girder tilt to the other side, the lifting of the two lifting cables can make the lifting frame and the steel box girder tilt to one side or the other side, and then the steering disc can adjust the lengths of the two ends of the steering cable, so that the steering cable adjusts the tilt angle of the lifting frame forward and backward. In operation, the motor drives the driving wheel to rotate, so that the driving wheel controls the lengths of the two 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 forward and backward adjustment of the lifting frame and the steel box girder, and adjusting the lifting frame and the steel box girder to the horizontal state, facilitating the installation of the steel box girder.

[0028] 3. By setting the hanger, the super-heavy steel box girder lifting gantry crane can be flexibly applied to steel box girder structures of different specifications, and the application range is improved.

[0029] When in operation, in order to meet the hoisting operation of steel box beams of different sizes, the bidirectional screw rod is driven by a motor, so that the threaded sliding block is driven by the bidirectional screw rod, thereby driving the two groups of moving carriages to move towards each other, adjusting the positions of the two groups of hooks, and the position of the hooks can be adjusted at the lower end of the moving carriage through the position adjustment of the moving sliding block, so that the double position adjustment of the hooks is completed, which facilitates the butt joint fixing of steel box beams of different specifications, and the gear is driven by a motor, so that the butt joint shaft is driven to rotate by the gear, and the rotation adjustment of the steel box beam can be completed through the rotation of the hoisting device. BRIEF DESCRIPTION OF DRAWINGS

[0030] The application will be further described below with reference to the drawings.

[0031] Figure 1 is a schematic diagram of the overall structure of the gantry crane for lifting an overweight steel box beam of the application;

[0032] Figure 2 is a partial structural diagram of the gantry crane for lifting an overweight steel box beam of the application;

[0033] Figure 3 is a diagram of the overall structure of the hanging frame in the gantry crane for lifting an overweight steel box beam of the application;

[0034] Figure 4 is a diagram of the overall structure of the moving base in the gantry crane for lifting an overweight steel box beam of the application;

[0035] Figure 5 is a diagram of the internal structure of the steering disc in the gantry crane for lifting an overweight steel box beam of the application;

[0036] Figure 6 is a diagram of the overall structure of the supporting sliding seat in the gantry crane for lifting an overweight steel box beam of the application.

[0037] In the figure: 1, first support frame; 2, second support frame; 3, sliding cross beam; 4, moving base; 5, spliced sliding rail; 6, hoisting device; 7, lifting machine; 8, electric control buckle; 9, hoisting cable; 10, butt joint head; 11, lifting frame; 12, butt joint shaft; 13, rotating table; 14, hanging frame; 15, steering disc; 16, transverse sliding rail; 17, sliding clamping seat; 18, winding rod; 19, moving carriage; 20, hook; 21, threaded sliding block; 22, bidirectional screw rod; 23, supporting sliding seat; 24, fixed frame; 25, transverse jacking rod; 26, longitudinal jacking rod; 27, limiting clamping wheel; 28, driving wheel; 29, friction sleeve; 30, steering cable; 31, fixed clamping plate; 32, fastening bolt; 33, moving sliding block. DETAILED DESCRIPTION

[0038] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object of the present application, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0039] As shown in Figure 1 , a gantry crane for lifting an overweight steel box girder and a construction method thereof, comprising 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 both fixedly installed with a sliding cross beam 3, and the inner side of the sliding cross beam 3 is movably installed with a hoisting device 6; the hoisting device 6 comprises a lifting machine 7, a sliding clamp seat 17, a fixed clamp plate 31, a rotary table 13 and a lifting frame 11, the hoisting device 6 is fixedly installed on the upper end outer surface of the sliding clamp seat 17, the fixed clamp plate 31 is fixedly installed on the lower end outer surface of the sliding clamp seat 17, the rotary table 13 is arranged at the lower part of the sliding clamp seat 17, the lifting frame 11 is movably installed on the lower end outer surface of the rotary table 13, the lifting frame 11 and the rotary table 13 are movably connected through a butt joint shaft 12, the upper end outer surface of the lifting frame 11 is fixedly installed with a butt joint clamp head 10 on both sides of the rotary table 13, and the bottom of the fixed clamp plate 31 is provided with a groove matched with the butt joint clamp head 10.

[0040] In order to solve the problem of shaking during lifting of the steel box girder, as shown in Figure 2 , the sliding clamp seat 17 is movably installed on the inner side of the sliding cross beam 3, and the inner side of the sliding cross beam 3 is provided with a transverse sliding rail 16 matched with the sliding clamp seat 17, the groove of the fixed clamp plate 31 is installed with an electric control buckle 8, the sliding clamp seat 17 can move along the transverse sliding rail 16, the position of the hoisting device 6 is adjusted through the sliding clamp seat 17, when the lifting frame 11 completes the fixing operation on the bridge steel box girder structure, the lifting frame 11 drives the steel box girder to move upward through the lifting cable 9, when the lifting frame 11 rises to the top position, the butt joint clamp head 10 is inserted into the butt joint clamp head 10 groove at the bottom of the fixed clamp plate 31, the electric control buckle 8 is controlled to extend and retract through the motor driven screw, so that the electric control buckle 8 is used for butt joint fixing between the butt joint clamp heads 10, so that the lifting frame 11 is fixed at the lower end of the fixed clamp plate 31, avoiding the swinging phenomenon of the lifting frame 11 and the steel box girder during movement.

[0041] As shown in Figure 2 , one end of the butt joint shaft 12 is provided with a gear, two groups of hangers 14 are movably installed at the lower part of the lifting frame 11, two lifting cables 9 are installed at the lower end of the lifting machine 7, and the two lifting cables 9 both penetrate the sliding clamp seat 17 and the fixed clamp plate 31, the independent winding and releasing operations of the two lifting cables 9 can be completed through the lifting machine 7, so that the lifting frame 11 is driven to move up and down through the lifting cable 9, and the gear is driven to rotate through the motor, so that the gear drives the butt joint shaft 12 to rotate, and the hoisting device 6 is driven to rotate through the butt joint shaft 12, so that the rotation adjustment of the steel box girder can be completed.

[0042] To solve the horizontal adjustment problem of the steel box girder hoisting, as shown in Figure 2 and 5 The inside of the lifting machine 7 is movably mounted with two winding rods 18, one end of each winding rod 18 is provided with a motor, the upper end of the hoisting cable 9 is fixedly connected with the winding rod 18, two groups of motors can be used to independently control the two winding rods 18, so that the two hoisting cables 9 are independently adjusted, and the lifting frame 11 and the steel box girder can be tilted to one side or the other by adjusting the length of the two hoisting cables 9.

[0043] As shown in Figure 3 The hanger 14 includes two groups of moving carriages 19 and bidirectional screws 22, the bidirectional screws 22 are movably mounted at the middle of the upper end of the two groups of moving carriages 19, and the middle of the upper end of the two groups of moving carriages 19 is provided with a threaded block 21 matched with the bidirectional screw 22, and the lower end of the two groups of moving carriages 19 is provided with two groups of hooks 20, in order to meet the hoisting operation of steel box girders of different sizes, the bidirectional screw 22 is driven by a motor, so that the two groups of moving carriages 19 are moved towards each other, thereby adjusting the position of the two groups of hooks 20.

[0044] As shown in Figure 6 The upper end of the hook 20 is provided with a moving block 33, the moving block 33 is movably mounted on the inner side of the moving carriage 19, the upper end of the moving block 33 is movably mounted with a fastening bolt 32, the position of the moving block 33 in the moving carriage 19 can be adjusted to adjust the position of the hook 20 at the lower end of the moving carriage 19, and the double position adjustment of the hook 20 is completed.

[0045] As shown in Figure 4 One side of the first support frame 1 and the second support frame 2 is movably mounted with a moving base 4, the lower part of the moving base 4 is movably mounted with a spliced sliding rail 5, the side of the moving base 4 is provided with a supporting slide 23, the moving base 4 and the supporting slide 23 are fixedly connected through a fixed frame 24, the two ends of the supporting slide 23 are provided with a horizontal top rod 25, and one end of the horizontal top rod 25 is movably mounted with a vertical top rod 26, the stability of the first support frame 1 and the second support frame 2 during the moving operation can be improved by using the supporting slide 23, when the moving base 4 drives the first support frame 1 and the second support frame 2 to move to the specified position by using the electric rollers at the bottom of the moving base 4, the horizontal top rods 25 at the two ends of the moving base 4 are extended outward, and the vertical top rod 26 is driven to move downward, so that the lower end of the vertical top rod 26 is in contact with the ground.

[0046] The lower side of the hoisting cable 9 is provided with a direction adjusting cable 30, and the hoisting cable 9 and the direction adjusting cable 30 are provided with a direction adjusting disc 15, the two ends of the direction adjusting cable 30 are fixedly connected with the lifting frame 11, the length of the two ends of the direction adjusting cable 30 can be adjusted by using the direction adjusting disc 15, so that the inclination angle of the lifting frame 11 is adjusted.

[0047] AsFigure 5 As shown, the outer surface of the steering cable 30 is sleeved with a friction sleeve 29, the inner side of the steering disc 15 is movably mounted with two sets of limiting card wheels 27 and a set of driving wheels 28, the steering cable 30 is clamped between the two sets of limiting card wheels 27 and the set of driving wheels 28, and 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.

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

[0049] Step one, drive the first support frame 1 and the second support frame 2 by using the mobile base 4, so that the first support frame 1 and the second support frame 2 drive the lifting device 6 to move, move the lifting device 6 above the bridge steel box girder, release the lifting cable 9 by the hoist 7, so that the lifting cable 9 drives the lifting device 6 to move downward, fix the hook 20 at the upper end of the steel box girder, use the lifting cable 9 to move the lifting device 6 upward, and fix the lifting device 6 at the lower end of the sliding cross beam 3 through the electric control buckle 8 and the butt joint head 10;

[0050] Step two, move the lifting device 6 to the corresponding position, move the lifting device 6 downward by the lifting cable 9, drive the steering cable 30 to move by the driving wheel 28 of the steering disc 15, complete the front and rear inclination adjustment of the lifting device 6 and the steel box girder, control the winding or release operation of the lifting cable 9 by using two winding rods 18 respectively, so as to adjust the height of the two ends of the lifting device 6 and the steel box girder, and complete the horizontal adjustment of the lifting device 6 and the steel box girder.

[0051] In use, the conventional device uses a steel cable structure to lift the steel box girder, and completes the transfer of the steel box girder through the gantry, and is affected by the weight of the steel box girder, and after the steel box girder moves to the specified position, the steel box girder and the upper end of the steel cable structure will swing, and only when the steel box girder is in a stable state can the butt joint installation be carried out, which reduces the installation efficiency of the steel box girder and cannot realize stable transfer of the steel box girder;

[0052] Therefore, by setting the fixed clamping plate 31 and the mobile base 4, the gantry crane for lifting the overweight steel box girder has a fixed lifting and moving structure when in use, which avoids the shaking of the steel box girder during movement, improves the stability of the steel box girder lifting and moving operation, and enables the butt joint installation operation to be completed quickly;

[0053] In operation, first, the first support frame 1 and the second support frame 2 are driven by the mobile base 4 to move the lifting device 6 to above the steel box girder of the bridge, the hoisting cable 9 is released by the two groups of winding rods 18 of the lifting machine 7, the hoisting cable 9 drives the lifting device 6 to move downward, the hook 20 is fixed to the upper end of the steel box girder, the winding rod 18 is rotated by the motor drive, the hoisting cable 9 is wound by the winding rod 18, the lifting device 6 is lifted by the hoisting cable 9, when the lifting frame 11 rises to the top position, the butt joint head 10 is inserted into the butt joint head 10 groove at the bottom of the fixed clamping plate 31, the electric control buckle 8 is controlled by the motor drive screw to extend and retract, the butt joint head 10 and the electric control buckle 8 are fixed, the lifting frame 11 is fixed to the lower end of the fixed clamping plate 31, at this time, the first support frame 1 and the second support frame 2 are driven by the mobile base 4 to move along the splicing slide rail 5, the fixed lifting frame 11 fixes the steel box girder at the bottom of the sliding beam 3, avoids the swinging phenomenon of the lifting frame 11 and the steel box girder during movement, and realizes the fixed movement of the steel box girder, when the mobile base 4 drives the first support frame 1 and the second support frame 2 to move to the specified position by the electric roller at the bottom of the mobile base 4, the horizontal top rod 25 at both ends of the mobile base 4 extends outward, and the vertical top rod 26 is driven to move downward, so that the lower end of the vertical top rod 26 contacts the ground, which serves as an auxiliary support between the mobile base 4 and the ground, and improves the stability of the steel box girder during installation;

[0054] When the conventional device hoists the steel box girder, the hoisted steel box girder is prone to tilting, and during the installation of the steel box girder, the steel box girder needs to be horizontally calibrated, and the installation device itself cannot complete the horizontal adjustment of the steel box girder, which increases the installation difficulty of the steel box girder;

[0055] Therefore, by arranging the steering disc 15 and the two winding rods 18, the gantry crane for lifting superheavy steel box girders and the construction method thereof have the steel box girder hoisting horizontal adjustment structure, can automatically complete the horizontal adjustment of the steel box girder, and improve the installation effect;

[0056] When in use, the two groups of motors can be used to independently control the two winding rods 18, so that the two hoisting cables 9 are independently adjusted, when one hoisting cable 9 rises and the other hoisting cable 9 falls, the lifting 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 lifting frame 11 and the steel box girder tilt to the other side, the lifting frame 11 and the steel box girder can tilt to one side or the other side by adjusting the two hoisting cables 9, and then the steering disc 15 can be used to adjust the length of the two ends of the steering cable 30, so that the steering cable 30 adjusts the tilt angle of the lifting frame 11, when operating, the motor drives the driving wheel 28 to rotate, so that the driving wheel 28 controls the length of the two 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 back adjustment of the lifting frame 11 and the steel box girder, so that the lifting frame 11 and the steel box girder are adjusted to a horizontal state, facilitating the installation operation of the steel box girder;

[0057] Meanwhile, different specifications of steel box girders have different sizes, and the above device cannot be flexibly applied to steel box girder structures of different sizes, reducing the use range of the installation device and unable to quickly complete the hoisting operation of steel box girders of different specifications;

[0058] Therefore, by arranging the hanger 14, the gantry crane for lifting the super-heavy steel box girder can be flexibly applied to steel box girder structures of different specifications, improving the application range thereof;

[0059] When operating, in order to meet the hoisting operation of steel box girders of different sizes, the motor drives the bidirectional screw rod 22, so that the bidirectional screw rod 22 drives the threaded sliding block 21, thereby driving the two groups of moving carriages 19 to move towards each other, adjusting the positions of the two groups of hooks 20, the position of the moving sliding block 33 in the moving carriage 19 can be adjusted to adjust the position of the hook 20 at the lower end of the moving carriage 19, completing the double position adjustment of the hook 20, facilitating the butt joint and fixation of steel box girders of different specifications, and the motor drives the gear, so that the gear drives the butt joint shaft 12 to rotate, and the butt joint shaft 12 drives the hoisting device 6 to rotate, thereby completing the rotation adjustment of the steel box girder.

[0060] The above is only a preferred embodiment of the present application, and does not limit the present application in any form, although the present application has been disclosed as above with a preferred embodiment, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, but as long as it does not deviate from the technical solution of the present application, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, all still belong to the scope of the technical solution of the present application.

Claims

1. A gantry crane for lifting an over-weight steel box girder, characterized in that, The utility model provides a lifting device, including first support frame (1) and second support frame (2), first support frame (1) sets up in one side of second support frame (2), and the upper end of first support frame (1) and second support frame (2) is fixedly installed with sliding crossbeam (3), the inner side movable mounting of sliding crossbeam (3) has hoist (6), the hoist (6) includes lifting machine (7), sliding card seat (17), fixed clamping plate (31), rotary table (13) and hoist frame (11), lifting machine (7) is fixedly installed in the upper end outer surface of sliding card seat (17), fixed clamping plate (31) is fixedly installed in the lower end outer surface of sliding card seat (17), rotary table (13) sets up in the lower part of sliding card seat (17), hoist frame (11) movable installation is in the lower end outer surface of rotary table (13), and the upper end outer surface of hoist frame (11) is located in the both sides of rotary table (13) and is fixedly installed with butt joint clamping head (10), and the bottom of fixed clamping plate (31) is equipped with the recess of cooperation butt joint clamping head (10) uses, The sliding card seat (17) is movably installed on the inner side of the sliding crossbeam (3), and the inner side of the sliding crossbeam (3) is provided with a transverse sliding rail (16) matched with the sliding card seat (17), and the recess of the fixed clamping plate (31) is provided with an electric control buckle (8); One end of the butt joint shaft (12) is provided with a gear, the lower part of the hoist frame (11) is movably provided with two groups of hanging frames (14), the lower end of the lifting machine (7) is provided with two lifting cables (9), and the two lifting cables (9) penetrate through the sliding card seat (17) and the fixed clamping plate (31); The inside of the lifting machine (7) is movably provided with two winding rods (18), one end of each of the two winding rods (18) is provided with a motor, and the upper end of the lifting cable (9) is fixedly connected with the winding rod (18); The lower side of the lifting cable (9) is provided with a direction adjusting cable (30), and the lifting cable (9) and the direction adjusting cable (30) are provided with a direction adjusting disc (15) therebetween, and the two ends of the direction adjusting cable (30) are fixedly connected with the hoist frame (11); The outer surface of the direction adjusting cable (30) is sleeved with a friction sleeve (29), the inner side of the direction adjusting disc (15) is movably provided with two groups of limiting clamping wheels (27) and a group of driving wheels (28), and the direction adjusting cable (30) is clamped between the two groups of limiting clamping wheels (27) and the group of driving wheels (28).

2. The gantry crane for lifting an overweight steel box girder according to claim 1, characterized in that, The hanging frame (14) includes two groups of moving carriages (19) and a bidirectional screw rod (22), the bidirectional screw rod (22) is movably installed at the upper end middle part of the two groups of moving carriages (19), and the upper end middle part of the two groups of moving carriages (19) is provided with a threaded sliding block (21) matched with the bidirectional screw rod (22), and the lower end of the two groups of moving carriages (19) is provided with two groups of hooks (20).

3. The gantry crane for lifting an overweight steel box girder according to claim 2, characterized in that, The upper end of the hook (20) is provided with a moving block (33), the moving block (33) is movably installed on the inner side of the moving carriage (19), and the upper end of the moving block (33) is movably provided with a fastening bolt (32).

4. The gantry crane for lifting an overweight steel box girder according to claim 3, characterized in that, One side of the first support frame (1) and the second support frame (2) is provided with a mobile base (4), the lower part of the mobile base (4) is provided with a spliced slide rail (5), the side of the mobile base (4) is provided with a supporting slide (23), the mobile base (4) and the supporting slide (23) are fixedly connected through a fixing frame (24), the both ends of the supporting slide (23) are provided with a transverse jack (25), and one end of the transverse jack (25) is provided with a longitudinal jack (26).

5. The construction method of a gantry crane for lifting an overweight steel box girder according to any one of claims 1-4, characterized in that, It comprises the following steps: Step one, drive the first support frame (1) and the second support frame (2) by the mobile base (4), so that the first support frame (1) and the second support frame (2) drive the lifting device (6) to move, move the lifting device (6) above the steel box girder of the bridge, release the lifting cable (9) through the lifting machine (7), so that the lifting cable (9) drives the lifting device (6) to move down, fix the hook (20) on the upper end of the steel box girder, use the lifting cable (9) to move the lifting device (6) up, fix the lifting device (6) on the lower end of the sliding beam (3) through the electric control buckle (8) and the butt joint clamp (10); Step two, move the lifting device (6) to the corresponding position, move the lifting device (6) down through the lifting cable (9), use the driving wheel (28) of the steering disc (15) to drive the steering cable (30) to move, complete the front and rear inclination adjustment of the lifting device (6) and the steel box girder, use two winding rods (18) to control the winding or releasing operation of the lifting cable (9) respectively, so as to adjust the height of the both ends of the lifting device (6) and the steel box girder, complete the horizontal adjustment of the lifting device (6) and the steel box girder.

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