Portal crane outrigger jacking device and construction method thereof

Abstract

The application discloses a gantry crane supporting leg jacking device and a construction method thereof; the clamping plate is clamped on the outer wall of the secondary cross beam for fixation, which is simpler than the welding installation mode and is convenient for dismounting and reusing; the traditional cross beam structure is optimized, the thickness and material of the cross beam structure plate are optimized, the extension rod is better extended to a suitable position, the support frame is fixed, the support frame fixes the secondary cross beam, the limiting sleeve rotates on the outer wall of the threaded connecting rod, the limiting sleeve abuts against the inner wall of the supporting leg cross beam, the optimized design has enough bending strength through calculation, and then the construction process is also optimized and designed, so that the cross beam cannot be damaged due to insufficient bending strength in the construction process, and further safety accidents are caused, the operation time of the employees is reduced, and the labor intensity of the employees is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering equipment, in particular to a gantry crane supporting leg jacking device and a construction method thereof. BACKGROUND

[0002] The portal crane is a deformation of the bridge crane, also known as gantry crane. It is mainly used for loading and unloading operations in outdoor freight yards. The portal crane has the characteristics of high site utilization rate, large operation range, wide adaptability, and strong versatility, and is widely used in port freight yards. The gantry crane has four supporting legs, each of which is composed of a first-level balance beam, a second-level balance beam, and a walking trolley. They are hinged by hinge seats. Due to long-term use and rain erosion, the second-level balance beam hinge seat is severely distorted and needs to be replaced in time to prevent safety hazards. Under normal circumstances, the first-level balance beam of the supporting leg should be jacked up to replace the second-level balance beam hinge seat. However, the jacking position is too high and the force-bearing position is too narrow, so the scheme is redesigned, and the jacking method and device of the supporting leg are optimized and improved. When the gantry crane needs to replace the second-level balance beam hinge seat, the upper half of the second-level balance beam is jacked up by a jack during construction. However, there is no crossbeam with sufficient bending strength, so the traditional crossbeam structure is optimized, and the thickness and material of the crossbeam structure plate are optimized. Through calculation, it is determined that the optimized design has sufficient bending strength. During construction, the crossbeam will not be damaged due to insufficient bending strength, thereby causing safety accidents. At the same time, when replacing the second-level balance beam hinge seat, the supporting leg is lifted, and the second-level balance beam loses support and risks falling. The existing fixing method needs to use external supports for welding and fixing, which is not convenient for installation, disassembly, and reuse, and the practicality is not good. In addition, there is no support between the supporting leg and the crossbeam. When the supporting leg is lifted and the balance beam hinge seat is disassembled, the crossbeam loses support and is easy to move, which poses a certain safety hazard. SUMMARY

[0003] The present application provides a gantry crane supporting leg jacking device and a construction method thereof to solve the above problems.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A gantry crane supporting leg jacking device, comprising a supporting leg crossbeam, a supporting assembly is installed on the outer wall of the supporting leg crossbeam, a first hinge seat connecting piece is installed on the outer wall of the supporting leg crossbeam, a first-level crossbeam is installed on the outer wall of the first-level crossbeam, a fixed block is installed on the outer wall of the first-level crossbeam, a pull ring is installed on the outer wall of the fixed block, a connecting seat is installed on the outer wall of the pull ring, a second-level crossbeam is installed on the outer wall of the first-level crossbeam through a second hinge seat connecting piece, a walking trolley assembly is installed on the outer wall of the first-level crossbeam and the second-level crossbeam, and a fixing assembly is installed on the outer wall of the second-level crossbeam.

[0006] The support assembly comprises a lifting lug and a support beam, the lifting lug is installed on the outer wall of the support beam, the lifting lug is provided with a pull hook on the outer wall, the support beam is installed on the outer wall of the support beam, one end of the support beam is connected with the pull hook, the outer wall of the support beam is provided with a top block, the outer wall of the top block is provided with a jack, the outer wall of the support beam is provided with a fixing sleeve, the inner wall of the fixing sleeve is threadedly connected with a threaded connecting rod, and the outer wall of the threaded connecting rod is threadedly connected with a limiting sleeve.

[0007] The walking trolley assembly comprises a mounting bracket, the mounting bracket is respectively installed on the inner walls of the secondary beam and the primary beam through a screw rod, the opposite inner walls of the mounting bracket are provided with a rotating shaft, the outer wall of the rotating shaft is rotatably connected with a walking wheel, one end of the rotating shaft penetrates through the mounting bracket and extends to the outer wall of the mounting bracket and is connected with a speed changer, the outer wall of the speed changer is provided with a driving motor, and the outer wall of the driving motor is provided with a controller.

[0008] The fixing assembly comprises a mounting shell, the mounting shell is installed on the outer wall of the secondary beam, the side wall of the mounting shell is provided with a fixing bracket, the outer wall of the fixing bracket is provided with a servo motor, the driving shaft of the servo motor is provided with a rotating rod, one end of the rotating rod penetrates through the fixing bracket and extends to one side of the fixing bracket and is provided with a driving wheel, the outer wall of the driving wheel is meshed with a driven wheel, the inner wall of the driven wheel is provided with a threaded rod, one end of the threaded rod penetrates through the fixing bracket and the mounting shell in sequence and extends to the outer wall of the mounting shell and is threadedly connected with a clamping plate, the outer wall of the clamping plate is provided with a limiting rod, one end of the limiting rod is slidably connected to the outer wall of the mounting shell, the outer wall of the clamping plate is provided with a fixing sleeve, the inner wall of the fixing sleeve is slidably connected with an extension rod, and the outer wall of the fixing sleeve is provided with a support frame through bolts.

[0009] As a preferred scheme of the application, the controller is connected with the driving motor and the servo motor through wires and the connection mode is electrical connection, the walking trolley assembly is provided with multiple groups and is located on the outer walls of the primary beam and the secondary beam, and the lifting lug is provided with two groups and is located on the opposite outer walls of the support beam.

[0010] As a preferred scheme of the application, the pull hook is provided with two groups and is located on the outer wall of the lifting lug, the support beam is two pieces of 1240x200x25 manganese plate as the upper wing plate and the lower wing plate, which are supported by two pieces of 1240x130x25 manganese plate vertically, and three pieces of 130x75x25 manganese plate are evenly distributed in the cavity.

[0011] As a preferred scheme of the present application, the top block is provided with two groups and is located on the outer wall of the support beam respectively, the material of the top block is thick-walled pipe material, and the mounting bracket is provided with multiple groups.

[0012] As a preferred scheme of the present application, the rotating shaft is provided with two groups and is located on the inner wall of the mounting bracket respectively, the transmission end of the transmission is connected with the driving shaft of the driving motor, and the driven wheel is provided with two groups and is located on the outer wall of the driving wheel respectively.

[0013] As a preferred scheme of the present application, the threaded rod is provided with two groups and is located on the opposite outer walls of the mounting shell respectively, the connection mode between the threaded rod and the mounting shell is rotary connection, and the screw directions of the threaded rods are opposite.

[0014] As a preferred scheme of the present application, the clamping plate is provided with two groups and is located on the outer wall of the threaded rod respectively, the clamping plate is in Z-shaped structure, and the limiting rod is provided with two groups and is located on the opposite outer walls of the mounting shell respectively.

[0015] As a preferred scheme of the present application, the fixing sleeve is provided with two groups and is located on the outer wall of the clamping plate respectively, the clamping plate is located on the opposite outer walls of the secondary beam respectively, and the support frame is provided with multiple groups and is located on the outer walls of the fixing sleeve and the extension rod respectively.

[0016] Compared with the prior art, in the gantry crane support leg jacking device, the driven wheel drives the clamping plate to rotate through the threaded rod, so that the threaded rod drives the clamping plate to move to the middle, the limiting rod plays a limiting role, the clamping plate slides on the outer wall of the limiting rod, the clamping plate is clamped on the outer wall of the secondary beam for fixation, compared with the welding installation mode, the present application is simpler and is convenient for disassembly and reuse, thereby solving the problem that when the secondary balance beam hinge seat is replaced, the secondary balance beam loses support and exists the risk of falling when the support leg is lifted, the existing fixing mode needs to be welded and fixed by using external supports, which is inconvenient for installation, disassembly and reuse, and the practicality is not very good.

[0017] The present application provides sufficient working conditions for forklift construction by removing the cargo on both sides of the track of the to-be-repaired part when the gantry crane is parked on the hard base ground, opening the gantry crane trolley to the most northern side, lifting the prepared support beam to the specified position by the forklift, hooking the support beam by the pull block hook on the lifting lug, lifting and tightening the support beam, placing the two jacks under the support beam, picking up a jack block (thick-walled pipe) on the jack by the forklift, keeping the jack block in an upright state, manually adjusting the position of the jack block to ensure that the jack block is at the top of the jack and the support beam, tightening the jack to ensure that the jack block is tightly pressed, and then another top point is pressed in the same way. The gantry crane leg beam is slightly lifted by the two jacks, and the jacks are stopped as soon as the wheels are away from the track, and then the jacks are slightly loosened to make the wheels fall onto the track. The jacks are locked, and then a few times are pressed. The weld between the to-be-replaced balance beam hinge seat and the first balance beam is cut off by the gas cutting device, the hinge shaft clamping plate and the hinge shaft of the to-be-replaced hinge seat are removed, and the hinge seat is removed. The bottom plate of the first balance beam is polished to expose the metal base color. The cut-off limiting block in the hinge seat is welded to the new balance beam hinge seat. The prepared second balance beam hinge seat is moved to the installation position, the hinge shaft and the clamping plate bolt are installed, and the gas shield welding is welded, and the weld is not less than 10 mm, thereby solving the problem that the leg is composed of a first balance beam, a second balance beam and a walking trolley, and they are hinged by a hinge seat. Due to the long-term use of the gantry crane and the rain erosion, the second balance beam hinge seat is seriously distorted and needs to be replaced in time to prevent safety hazards.

[0018] The present application can better extend the extension rod to the appropriate position, fix the support frame, fix the support frame to the second cross beam, prevent the device from tilting when the leg is jacked up, and only need to rotate the threaded connecting rod when in use. The limiting sleeve can rotate on the outer wall of the threaded connecting rod, the limiting sleeve can be placed on the inner wall of the leg cross beam, and the limiting sleeve can support the leg cross beam and the first cross beam, thereby solving the problem that there is no support between the leg and the cross beam. When the leg is lifted and the balance beam hinge seat is removed, the cross beam loses support and is easy to move, which exists certain safety hazards. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is a schematic diagram of the side structure of the present application;

[0021] Figure 3 It is a schematic diagram of the installation sleeve structure of the present application;

[0022] Figure 4 It is a schematic diagram of the extension rod structure of the present application;

[0023] Figure 5Structure schematic view of walking trolley assembly of the present application;

[0024] Figure 6 Structure schematic view of fixing assembly of the present application;

[0025] Figure 7 Structure schematic view of mounting shell of the present application;

[0026] Figure 8 Structure schematic view of support assembly of the present application.

[0027] In the figure: 1, support beam; 2, support assembly; 201, lifting lug; 202, support beam; 203, hook of pull hoist; 204, top block; 205, jack; 206, mounting sleeve; 207, threaded connecting rod; 208, limiting sleeve; 3, first hinge base connecting piece; 4, primary beam; 5, fixing block; 6, pull ring; 7, connecting seat; 8, second hinge base connecting piece; 9, secondary beam; 10, walking trolley assembly; 1001, mounting bracket; 1002, screw rod; 1003, rotating shaft; 1004, walking wheel; 1005, transmission; 1006, driving motor; 1007, controller; 11, fixing assembly; 1101, mounting shell; 1102, fixing bracket; 1103, servo motor; 1104, rotating rod; 1105, driving wheel; 1106, driven wheel; 1107, threaded rod; 1108, clamping plate; 1109, limiting rod; 1110, fixing sleeve; 1111, extension rod; 1112, bolt; 1113, support frame. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0029] Embodiment: Please refer to Figures 1-8 The gantry crane support leg jacking device shown in the figure comprises a support beam 1, a support assembly 2 is installed on the outer wall of the support beam 1, a primary beam 4 is installed on the outer wall of the support beam 1 through a first hinge base connecting piece 3, a fixing block 5 is installed on the outer wall of the primary beam 4, a pull ring 6 is installed on the outer wall of the fixing block 5, a connecting seat 7 is installed on the outer wall of the pull ring 6, a secondary beam 9 is installed on the outer wall of the primary beam 4 through a second hinge base connecting piece 8, a walking trolley assembly 10 is installed on the outer walls of the primary beam 4 and the secondary beam 9, and a fixing assembly 11 is installed on the outer wall of the secondary beam 9.

[0030] In this embodiment, specific reference is made to Figure 1And Figure 8 , support assembly 2 includes lug 201 and support beam 202, the lug 201 is installed on the outer wall of the leg beam 1, the lug 201 is provided with two groups and is located on the opposite outer wall of the leg beam 1 respectively, the outer wall of the lug 201 is provided with pull hook 203, the support beam 202 is installed on the outer wall of the leg beam 1, the support beam 202 is two pieces of 1240x200x25 manganese plate as the upper wing plate and the lower wing plate, which is supported by two pieces of 1240x130x25 manganese plate vertically, three pieces of 130x75x25 manganese plate are evenly distributed in the cavity, one end of the support beam 202 is connected with the pull hook 203, the pull hook 203 is provided with two groups and is located on the outer wall of the lug 201 respectively, the outer wall of the support beam 202 is provided with top block 204, the top block 204 is provided with two groups and is located on the outer wall of the support beam 202 respectively, the material of the top block 204 is thick wall pipe material, the outer wall of the top block 204 is provided with jack 205, the outer wall of the support beam 202 is provided with mounting sleeve 206, the inner wall of the mounting sleeve 206 is threadedly connected with threaded connecting rod 207, the outer wall of the threaded connecting rod 207 is threadedly connected with limiting sleeve 208.

[0031] In this embodiment, specific reference is made to Figure 2 And Figure 5 , walking trolley assembly 10 includes mounting bracket 1001, mounting bracket 1001 is installed on the inner wall of two-stage beam 9 and one-stage beam 4 respectively through screw rod 1002, mounting bracket 1001 is provided with multiple groups, mounting bracket 1001 is provided with rotating shaft 1003 on the opposite inner wall, rotating shaft 1003 is provided with two groups and is located on the inner wall of mounting bracket 1001 respectively, rotating shaft 1003 is provided with walking wheel 1004 on the outer wall, one end of rotating shaft 1003 penetrates through mounting bracket 1001 and extends to the outer wall of mounting bracket 1001 and is connected with speed changer 1005, the driving shaft of driving motor 1006 is connected with the driving end of speed changer 1005, speed changer 1005 is provided with driving motor 1006 on the outer wall, driving motor 1006 is provided with controller 1007 on the outer wall.

[0032] In this embodiment, specific reference is made to Figure 4 , Figure 6 And Figure 7The fixed assembly 11 comprises a mounting shell 1101 mounted on the outer wall of the secondary cross beam 9, a fixed support 1102 mounted on the side wall of the mounting shell 1101, a servo motor 1103 mounted on the outer wall of the fixed support 1102, a rotating rod 1104 mounted on the driving shaft of the servo motor 1103, a driving wheel 1105 mounted at one end of the rotating rod 1104 and extending to one side of the fixed support 1102, a driven wheel 1106 meshed and connected with the outer wall of the driving wheel 1105, the driven wheel 1106 being provided with two groups and located on the outer wall of the driving wheel 1105 respectively, a threaded rod 1107 mounted on the inner wall of the driven wheel 1106, the threaded rod 1107 being provided with two groups and located on the opposite outer walls of the mounting shell 1101 respectively, the threaded rod 1107 being rotatably connected with the mounting shell 1101, the threaded rods 1107 being opposite in screw direction, one end of the threaded rod 1107 being threaded and connected with a clamping plate 1108 extending to the outer wall of the mounting shell 1101 through the fixed support 1102, the clamping plate 1108 being located on the opposite outer walls of the secondary cross beam 9 respectively, the clamping plate 1108 being provided with two groups and located on the outer walls of the threaded rods 1107 respectively, the clamping plate 1108 being of Z-shaped structure, a limiting rod 1109 being mounted on the outer wall of the clamping plate 1108, the limiting rod 1109 being provided with two groups and located on the opposite outer walls of the mounting shell 1101 respectively, one end of the limiting rod 1109 being slidably connected with the outer wall of the mounting shell 1101, a fixing sleeve 1110 being mounted on the outer wall of the clamping plate 1108, the fixing sleeve 1110 being provided with two groups and located on the outer wall of the clamping plate 1108 respectively, an extension rod 1111 being slidably connected with the inner wall of the fixing sleeve 1110, a support frame 1113 being mounted on the outer wall of the fixing sleeve 1110 by bolts 1112, the support frame 1113 being provided with multiple groups and located on the outer walls of the fixing sleeve 1110 and the extension rod 1111 respectively.

[0033] The controller 1007 is electrically connected with the driving motor 1006 and the servo motor 1103 through wires, so that the device is powered on, the walking trolley assembly 10 is provided with multiple groups and located on the outer walls of the primary cross beam 4 and the secondary cross beam 9, facilitating movement, and the mounting sleeve 206 is located between the primary cross beam 4 and the leg cross beam 1, facilitating fixed support.

[0034] The gantry crane supporting leg jacking device in the scheme is in operation, the side wall of the installation shell 1101 is provided with a fixed support 1102, the outer wall of the fixed support 1102 is provided with a servo motor 1103, the driving shaft of the servo motor 1103 is provided with a rotating rod 1104, one end of the rotating rod 1104 penetrates through the fixed support 1102 and extends to the side of the fixed support 1102, and the outer wall of the driving wheel 1105 is connected under the action of the driving wheel 1105. First, place the installation shell 1101 on the outer wall of the secondary cross beam 9, just need to open the switch of the controller 1007, so that the controller 1007 controls the servo motor 1103 to operate, so that the driving shaft of the servo motor 1103 controls the driving wheel 1105 to rotate through the rotating rod 1104, the outer wall of the driving wheel 1105 is connected with the driven wheel 1106, the inner wall of the driven wheel 1106 is provided with a threaded rod 1107, one end of the threaded rod 1107 penetrates through the fixed support 1102 and the installation shell 1101 in sequence and extends to the outer wall of the installation shell 1101, and the clamping plate 1108 is connected in screw thread under the action of the clamping plate 1108, the driving wheel 1105 drives the driven wheel 1106 to rotate, so that the driven wheel 1106 drives the clamping plate 1108 to rotate through the threaded rod 1107, a limiting rod 1109 is installed on the outer wall of the clamping plate 1108, one end of the limiting rod 1109 is connected on the outer wall of the installation shell 1101 in sliding mode, the threaded rod 1107 and the installation shell 1101 are connected in rotating mode, the threaded direction of the threaded rod 1107 is opposite, the clamping plate 1108 is provided with two groups and located on the outer wall of the threaded rod 1107 respectively, the clamping plate 1108 is of Z-shaped structure, so that the threaded rod 1107 drives the clamping plate 1108 to move to the middle, and the limiting rod 1109 plays a limiting role, so that the clamping plate 1108 slides on the outer wall of the limiting rod 1109, so that the clamping plate 1108 is clamped on the outer wall of the secondary cross beam 9 for fixation, compared with the welding installation mode, it is simpler and convenient to disassemble and reuse, so as to solve the risk of falling of the secondary balance beam when the supporting leg is lifted, the existing fixing mode needs to be welded and fixed by using external support, which is not convenient for installation, disassembly and reuse, and the practicability is not very good.

[0035] The outer wall of the clamping plate 1108 is provided with a fixing sleeve 1110, the inner wall of the fixing sleeve 1110 is slidably connected with an extension rod 1111, the outer wall of the fixing sleeve 1110 is provided with a support frame 1113 through bolts 1112, the extension rod 1111 is pulled out, the extension rod 1111 is better extended to a suitable position, the support frame 1113 is fixed, the support frame 1113 fixes the secondary cross beam 9, the device is prevented from tilting when the support legs are jacked up, the outer wall of the top block 204 is provided with a jack 205, the outer wall of the support cross beam 202 is provided with a mounting sleeve 206, the inner wall of the mounting sleeve 206 is threadedly connected with a threaded connecting rod 207, the outer wall of the threaded connecting rod 207 is threadedly connected with a limiting sleeve 208, when in use, the limiting sleeve 208 is rotated on the outer wall of the threaded connecting rod 207 by rotating the threaded connecting rod 207, the limiting sleeve 208 is abutted against the inner wall of the support leg cross beam 1, the limiting sleeve 208 supports the support leg cross beam 1 and the primary cross beam 4, so that the problem that the support leg and the cross beam are not supported is solved, when the support leg is lifted and the balance beam hinge support is disassembled, the cross beam loses support and is easily moved, and there is a certain safety hazard.

[0036] The gantry crane is stopped on the hard foundation ground under the action of the pull hook 203 installed on the outer wall of the lug 201, the goods on both sides of the track at the repair site are removed, sufficient working conditions are provided for the forklift construction, the gantry crane trolley is opened to the most north side, the support beam 202 is installed on the outer wall of the support leg beam 1, one end of the support beam 202 is connected with the pull hook 203, the top block 204 is installed on the outer wall of the support beam 202, the support beam 202 is lifted to the specified position by the forklift under the action of the jack 205 installed on the outer wall of the top block 204, the support beam 202 is lifted and pulled tight by the pull hook 203 on the lug 201, one top block 204 (thick-walled pipe) is lifted on the jack 205 by the forklift, and the position of the top block 204 is adjusted manually to ensure that the top block 204 is at the top position of the jack 205 and the support beam 202, the jack 205 is tightened to ensure that the top block 204 is tightly pressed, and then another top point is tightened in the same way. The gantry crane and the support leg beam 1 are slightly lifted by the two jacks 205, and the jacks 205 are stopped from being tightened as soon as the wheels are separated from the track, and then the jacks 205 are slightly loosened to make the wheels fall on the track. The jacks 205 are locked, and then they are tightened a few times. The weld between the balance beam hinge seat to be replaced and the first balance beam is cut off by the gas cutting device, the hinge shaft clamping plate and the hinge shaft of the hinge seat to be replaced are removed, and the hinge seat is removed. The bottom plate of the first balance beam is polished to expose the metal base color. The limiting block in the cut hinge seat is welded to the new balance beam hinge seat. The second balance beam hinge seat is moved to the installation position, the hinge shaft and the clamping plate bolt are installed, and the gas shield welding is welded, and the welding seam is not less than 10 mm, so that the support leg is composed of the first and second balance beams and the walking trolley, and they are connected by the hinge seat. Due to the long-term use of the gantry crane and the rain erosion, the second balance beam hinge seat is seriously distorted and deformed, which needs to be replaced in time to prevent safety hazards.

[0037] The thickness and material of the beam structure plate are optimized by optimizing the traditional beam structure, and the bending strength of the optimized design is sufficient through calculation. Then the construction process is also optimized and designed so that the beam will not be damaged due to insufficient bending strength during construction, thereby reducing the operation time of employees and reducing the labor intensity of employees. The safety factor increases linearly during the implementation of the project, which ensures the safety of employees' lives and the safety of company property. The technology is reliable, low in cost and strong in applicability, and can be popularized on similar lifting equipment.

[0038] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A gantry crane outrigger jacking device comprising an outrigger beam (1), characterised in that: The outer wall of the support assembly (2) is provided with a lug (201), and the outer wall of the lug (201) is provided with a pull hook (203); the outer wall of the support beam (1) is provided with a first hinge base connector (3), and the outer wall of the first hinge base connector (3) is provided with a primary beam (4); the outer wall of the primary beam (4) is provided with a fixed block (5), and the outer wall of the fixed block (5) is provided with a pull ring (6); the outer wall of the pull ring (6) is provided with a connecting seat (7), and the outer wall of the primary beam (4) is provided with a second hinge base connector (8); the outer wall of the second hinge base connector (8) is provided with a secondary beam (9); the outer wall of the primary beam (4) and the secondary beam (9) is provided with a walking trolley assembly (10); the outer wall of the secondary beam (9) is provided with a fixed assembly (11). The support assembly (2) includes a lug (201) and a support beam (202), the lug (201) is installed on the outer wall of the support beam (1), the outer wall of the lug (201) is provided with a pull hook (203), the support beam (202) is installed on the outer wall of the support beam (1), one end of the support beam (202) is connected with the pull hook (203), the outer wall of the support beam (202) is provided with a top block (204), the outer wall of the top block (204) is provided with a jack (205), the outer wall of the support beam (202) is provided with a mounting sleeve (206), the inner wall of the mounting sleeve (206) is threadedly connected with a threaded connecting rod (207), the outer wall of the threaded connecting rod (207) is threadedly connected with a limiting sleeve (208). The walking trolley assembly (10) includes a mounting bracket (1001), the mounting bracket (1001) is respectively installed on the inner walls of the secondary beam (9) and the primary beam (4) through a screw rod (1002), the opposite inner walls of the mounting bracket (1001) are provided with a rotating shaft (1003), the outer wall of the rotating shaft (1003) is rotatably connected with a walking wheel (1004), one end of the rotating shaft (1003) penetrates through the mounting bracket (1001) and extends to the outer wall of the mounting bracket (1001) and is connected with a speed changer (1005), the outer wall of the speed changer (1005) is provided with a driving motor (1006), the outer wall of the driving motor (1006) is provided with a controller (1007). The fixed assembly (11) comprises a mounting shell (1101) mounted on the outer wall of the secondary cross beam (9), a fixed support (1102) is mounted on the side wall of the mounting shell (1101), a servo motor (1103) is mounted on the outer wall of the fixed support (1102), a rotating rod (1104) is mounted on the driving shaft of the servo motor (1103), a driving wheel (1105) is mounted on one end of the rotating rod (1104) penetrating through the fixed support (1102) and extending to one side of the fixed support (1102), a driven wheel (1106) is engagedly connected to the outer wall of the driving wheel (1105), a threaded rod (1107) is mounted on the inner wall of the driven wheel (1106), a clamping plate (1108) is threadedly connected to the outer wall of the mounting shell (1101) in sequence through the threaded rod (1107) penetrating through the fixed support (1102) and the mounting shell (1101), a limiting rod (1109) is mounted on the outer wall of the clamping plate (1108), one end of the limiting rod (1109) is slidingly connected to the outer wall of the mounting shell (1101), a fixing sleeve (1110) is mounted on the outer wall of the clamping plate (1108), an extension rod (1111) is slidingly connected to the inner wall of the fixing sleeve (1110), and a support frame (1113) is mounted on the outer wall of the fixing sleeve (1110) through bolts (1112).

2. The gantry crane outrigger jacking device of claim 1, wherein: The controller (1007) is connected with the driving motor (1006) and the servo motor (1103) through wires in an electrical connection manner, the walking trolley assembly (10) is provided with multiple groups and is located on the outer walls of the primary cross beam (4) and the secondary cross beam (9), and the lifting lug (201) is provided with two groups and is located on the opposite outer walls of the supporting leg cross beam (1).

3. The gantry jib lift leg jacking device of claim 1, wherein: The pull hook (203) is provided with two groups and is located on the outer wall of the lifting lug (201), the supporting cross beam (202) is two pieces of 1240x200x25 manganese plate as the upper wing plate and the lower wing plate, which are supported by two pieces of 1240x130x25 manganese plate vertically, and three pieces of 130x75x25 manganese plate are evenly distributed in the cavity.

4. The gantry jib lift device of claim 1, wherein: The top block (204) is provided with two groups and is located on the outer wall of the supporting cross beam (202), the material of the top block (204) is thick-walled pipe material, and the mounting support (1001) is provided with multiple groups.

5. The gantry jib lift device of claim 1, wherein: The rotating shaft (1003) is provided with two groups and is located on the inner wall of the mounting support (1001), the driving shaft of the driving motor (1006) is connected to the transmission end of the transmission (1005), and the driven wheel (1106) is provided with two groups and is located on the outer wall of the driving wheel (1105).

6. The gantry jib lift device of claim 1, wherein: The threaded rod (1107) is provided with two groups and is located on the opposite outer walls of the mounting shell (1101), the threaded rod (1107) and the mounting shell (1101) are connected in a rotating connection manner, and the threaded directions of the threaded rods (1107) are opposite.

7. The gantry jib lift device of claim 1, wherein: The clamping plates (1108) are provided with two groups and are located on the outer walls of the threaded rods (1107) respectively, the clamping plates (1108) are Z-shaped structures, and the limiting rods (1109) are provided with two groups and are located on the opposite outer walls of the mounting shell (1101) respectively.

8. The gantry jib lift device of claim 1, wherein: The fixing sleeves (1110) are provided with two groups and are located on the outer walls of the clamping plates (1108) respectively, the clamping plates (1108) are located on the opposite outer walls of the secondary cross beams (9) respectively, and the support frames (1113) are provided with multiple groups and are located on the outer walls of the fixing sleeves (1110) and the extension rods (1111) respectively.

9. The construction method of a gantry crane outrigger jacking device according to any one of claims 1-8, characterized in that, The steps are specifically as follows: Step 1: by placing the mounting shell (1101) on the outer wall of the secondary cross beam (9) first, only the switch of the controller (1007) needs to be turned on, so that the controller (1007) controls the servo motor (1103) to operate, so that the driving shaft of the servo motor (1103) controls the driving wheel (1105) to rotate through the rotating rod (1104), the driving wheel (1105) drives the driven wheel (1106) to rotate, so that the driven wheel (1106) drives the clamping plate (1108) to rotate through the threaded rod (1107), the limiting rod (1109) is installed on the outer wall of the clamping plate (1108), one end of the limiting rod (1109) is slidably connected to the outer wall of the mounting shell (1101), the threaded rod (1107) and the mounting shell (1101) are rotatably connected, the threaded directions of the threaded rods (1107) are opposite, the clamping plates (1108) are provided with two groups and are located on the outer walls of the threaded rods (1107) respectively, the clamping plates (1108) are Z-shaped structures, so that the threaded rod (1107) drives the clamping plate (1108) to move to the middle, and the limiting rod (1109) plays a limiting role, so that the clamping plate (1108) slides on the outer wall of the limiting rod (1109), so that the clamping plate (1108) is clamped on the outer wall of the secondary cross beam (9) for fixation, compared with the welding installation mode, it is simpler and convenient to disassemble and reuse; Step 2: pull out the extension rod (1111), so that the extension rod (1111) is better extended to the appropriate position, so that the support frame (1113) is fixed, so that the support frame (1113) fixes the secondary cross beam (9), prevents the device from tilting when the support leg is jacked up, and the jack (205) is installed on the outer wall of the top block (204), the mounting sleeve (206) is installed on the outer wall of the support cross beam (202), the threaded connecting rod (207) is threadedly connected to the inner wall of the mounting sleeve (206), and the limiting sleeve (208) is threadedly connected to the outer wall of the threaded connecting rod (207); when in use, only the threaded connecting rod (207) needs to be rotated, so that the limiting sleeve (208) rotates on the outer wall of the threaded connecting rod (207), so that the limiting sleeve (208) abuts against the inner wall of the support leg cross beam (1), so that the limiting sleeve (208) supports the support leg cross beam (1) and the primary cross beam (4). Step 3: The lug (201) is installed on the outer wall of the leg beam (1), and the pull hook (203) is installed on the outer wall of the lug (201). Under the action of the pull hook (203), the gantry crane is stopped on the hard foundation ground, the goods on both sides of the track at the repair site are removed, sufficient working conditions are provided for the forklift construction, the gantry crane trolley is opened to the north side, the support beam (202) is installed on the outer wall of the leg beam (1), one end of the support beam (202) is connected with the pull hook (203), the top block (204) is installed on the outer wall of the support beam (202), and the jack (205) is installed on the outer wall of the top block (204). Under the action of the jack (205), the prepared support beam (202) is lifted to the specified position by the forklift, the support beam (202) is lifted and pulled tight by the pull hook (203) on the lug (201), the two jacks (205) are placed under the support beam (202), one top block (204) is lifted on the jack (205) by the forklift, and the vertical state is maintained. Adjust the position of the top block (204) manually to ensure that the top block (204) is at the top point of the jack (205) and the support beam (202). Jack up the jack (205) to ensure that the top block (204) is tightly jacked, and then jack up the other top point in the same way. Two jacks (205) are used to jack up the gantry crane and the leg beam (1). Stop jacking when the running wheel is away from the track. Then loosen the jacks (205) to make the running wheel fall off the track. Lock the jacks (205), and then jack a few times. Use the gas cutting equipment to cut the weld between the balance beam hinge seat and the first level balance beam, remove the hinge shaft clamping plate and hinge shaft of the hinge seat to be replaced, and move out the hinge seat. Use the grinder to polish the bottom plate of the first level balance beam to expose the metal base color. Weld the limit block in the cut hinge seat to the new balance beam hinge seat, move the prepared second level balance beam hinge seat to the installation position, install the hinge shaft and clamping plate bolts, and weld with gas shielded welding. The weld is not less than 10mm.

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