Standardized adjustable assembly frame for steel box girder assembly

Abstract

This invention relates to the field of steel box girder jig technology and discloses a standardized adjustable jig for the overall assembly of steel box girders. The jig includes several crossbeams and two vertical beams symmetrically fixed to the top surface of the crossbeams. Two support leg boxes are symmetrically fixed to the bottom surface of the crossbeams, and support wheels are rotatably mounted on the sides of the support leg boxes. A ground rail corresponding to the two sets of support wheels is provided directly below the crossbeams. A driving structure is provided between the support leg boxes and the ground rail. Limiting components corresponding to the driving structure are provided on the crossbeams. The tops of the two vertical beams located on the same crossbeam are hinged with diagonal bracing frames. This invention uses a drive motor to drive a drive gear that slides along a fixed rack, allowing for flexible adjustment of the crossbeam spacing. This allows for adjusting the placement spacing according to the specifications of the steel box girder segments and adjusting the gaps between segments according to the overall assembly welding requirements. This ensures splicing accuracy while providing ample operating space for construction personnel and equipment, effectively improving construction safety and work efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel box girder jig technology, and more particularly to a standardized adjustable jig for the overall assembly of steel box girders. Background Technology

[0002] Steel box girders, also known as box beams, are steel structural load-bearing components with a closed box-shaped cross-section. They are widely used in bridge engineering (especially long-span bridges, urban overpasses, and viaducts) and large building structures. Their core advantages lie in their strong torsional resistance, high load-bearing capacity, and good structural stability, enabling them to effectively adapt to complex stress environments.

[0003] A search revealed that Chinese patent CN222375220U discloses a pre-assembly jig for steel box girders, comprising several modular jigs. Each modular jig includes a rectangular frame, support beams, and reinforcing diagonal beams. The support beams are positioned at the top of the rectangular frame, and the two ends of the reinforcing diagonal beams are connected to the transverse beams and / or vertical beams of the rectangular frame, respectively. The modular jigs are arranged in a rectangular array to form a modular jig group, which includes a middle modular jig group and outer modular jig groups. The outer modular jig groups are positioned on both sides of the middle modular jig group, and a trolley passage is provided between the middle modular jig group and the outer modular jig group. This method enables the pre-assembly of steel box girders, facilitates pre-assembly inspection, and offers advantages such as high assembly accuracy and efficiency, reusability, reduced steel waste, elimination of multiple hoisting and transportation operations, shortened manufacturing cycle, reduced raw material and personnel management costs, and improved manufacturing efficiency. However, this solution still has the following shortcomings in practical application:

[0004] In actual steel box girder production, the ability to adjust segment spacing has significant limitations, making it difficult to fully adapt to the diverse operational needs of complex construction scenarios and causing numerous inconveniences on-site. Specifically, during the fine-tuning stage of steel box girder segment connection, although the existing adjustment mechanism can achieve initial spacing reduction to ensure joint accuracy, it cannot flexibly and accurately expand the lateral gaps between segments according to the dynamic changes in construction procedures when entering critical stages such as welding, inspection, and installation of auxiliary components inside the segments. This directly leads to difficulties for construction personnel to smoothly enter the narrow space inside the girder segment to carry out welding operations from the side. At the same time, large inspection equipment and auxiliary tools cannot be easily accessed or properly arranged due to insufficient clearance, reducing overall construction efficiency and also affecting the stability of construction quality.

[0005] Therefore, it is necessary to design a standardized and adjustable assembly frame for steel box girders to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a standardized adjustable jig for the overall assembly of steel box girders.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The steel box girder assembly standardized adjustable jig includes several crossbeams and two vertical beams symmetrically fixedly installed on the top surface of the crossbeams. Two support leg boxes are symmetrically fixedly installed on the bottom surface of the crossbeams. Support wheels are rotatably installed on the sides of the support leg boxes. A ground rail corresponding to the two sets of support wheels is set directly below the crossbeams. A driving structure is set between the support leg boxes and the ground rails. A limiting component corresponding to the driving structure is set on the crossbeams. The tops of the two vertical beams located on the same crossbeam are hinged with diagonal bracing frames. A support component is set between the diagonal bracing frames and the crossbeams. A locking component corresponding to the steel box girder is set on the diagonal bracing frames.

[0009] The drive structure includes a partition plate fixedly installed on the bottom surface of the ground rail corresponding to the support wheel. A fixed rack is fixedly installed on the side of the partition plate. A drive motor is fixedly installed on the inner wall of several outrigger boxes located on the same side. A drive gear that meshes with the fixed rack is fixedly installed at the output end of the drive motor.

[0010] As a preferred embodiment of the present invention, the bottom surface of the outrigger box is in contact with the top surface of the ground rail.

[0011] As a preferred embodiment of the present invention, the limiting component includes an opening on the side of the ground rail, a plurality of limiting racks corresponding to the crossbeam are slidably installed on the inner wall of the opening, a guide opening is provided on the bottom surface of the crossbeam, a connecting frame is slidably installed on the inner wall of the guide opening, the bottom end of the connecting frame is fixedly connected to the side of the limiting rack, and a linkage structure corresponding to the connecting frame is provided on the inner side of the crossbeam.

[0012] As a preferred embodiment of the present invention, the linkage structure includes a fixed cylinder fixedly installed on the inner bottom surface of the crossbeam. A push screw is slidably installed on the inner wall of the fixed cylinder through a sliding groove and a slider. A threaded sleeve is rotatably installed at the open end of the fixed cylinder, and the threaded sleeve is screwed to the push screw. A push rod is fixedly installed at one end of the push screw located outside the fixed cylinder, and the end of the push rod is fixedly connected to the top end of the connecting frame. A fitting gear ring is fixedly fitted on the outer wall of the threaded sleeve. A pressure rod is provided through the top surface of the crossbeam. A drive rack that meshes with the fitting gear ring is fixedly installed at the bottom end of the pressure rod. A spring is fixedly installed between the bottom surface of the pressure rod and the inner bottom surface of the crossbeam.

[0013] As a preferred embodiment of the present invention, the bottom surface of the crossbeam is provided with a clearance opening corresponding to the drive rack.

[0014] As a preferred embodiment of the present invention, a pressure plate is fixedly installed at the top of the pressure rod, and a clearance ring groove corresponding to the pressure plate is opened on the top surface of the crossbeam.

[0015] As a preferred embodiment of the present invention, the support assembly includes a sliding plate slidably mounted on the inner wall of the bottom end of the diagonal brace frame. The top surface of the crossbeam has two guide openings symmetrically provided. The inner wall of the guide openings is slidably mounted with guide seats. The top surface of the guide seats is hinged to the bottom end of the sliding plate. The inner wall of the crossbeam is rotatably mounted with an adjusting screw, and both guide seats are screwed to the adjusting screw.

[0016] As a preferred embodiment of the present invention, the threads on both sides of the outer wall of the adjusting screw are in opposite directions, and one end of the adjusting screw passes through the side of the crossbeam and is fixedly mounted with an adjusting wheel.

[0017] As a preferred embodiment of the present invention, the locking assembly includes a plurality of top rods arranged in a linear array through the side of the diagonal brace frame. A stabilizing frame is hinged to one end of each top rod located outside the diagonal brace frame. A locking block is fixedly installed at the end of each top rod away from the stabilizing frame. A spring is fixedly installed between the side of the locking block and the inner wall of the diagonal brace frame. A linkage wedge is provided through the side of the diagonal brace frame. A locking plate corresponding to the locking block is fixedly installed at the end of the linkage wedge located inside the diagonal brace frame. Two springs are symmetrically fixedly installed between the side of the locking plate and the inner wall of the diagonal brace frame. An electric push rod is fixedly installed on the side of the diagonal brace frame. A drive wedge corresponding to the linkage wedge is fixedly installed at the telescopic end of the electric push rod.

[0018] As a preferred embodiment of the present invention, anti-slip textures are provided on the sides of the locking block and the locking plate that are opposite to each other.

[0019] The present invention has the following beneficial effects:

[0020] 1. In this invention, the drive motor drives the drive gear to slide along the fixed rack, which can flexibly adjust the crossbeam spacing. It can adjust the placement spacing according to the specifications of the steel box girder segments, and adjust the gap between segments according to the overall welding requirements. This ensures splicing accuracy and provides sufficient operating space for construction personnel and equipment, effectively improving construction safety and work efficiency.

[0021] 2. In this invention, when the steel box girder segment is hoisted into place, its own weight presses down on the pressure plate, triggering mechanical linkage, which drives the limit rack to mesh with the drive gear, automatically locking the crossbeam. The position of the crossbeam can be fixed without additional manual operation, preventing the crossbeam from shifting during construction, providing stable support for the steel box girder segment, and reducing the cumbersomeness and safety hazards of manual fixing.

[0022] 3. In this invention, the angle of the inclined support frame can be adjusted by rotating the adjusting wheel to drive the adjusting screw and driving the guide seat to slide. At the same time, the top rod can adapt to the side plate under the spring support. With the help of the electric push rod, the locking structure is fixed in position. The dual adjustable support can accurately adapt to different steel box girder side plate conditions, ensure the stability of the support limit, and improve the adaptability and reliability of the overall assembly construction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the standardized adjustable jig for the assembly of steel box girders proposed in this invention.

[0024] Figure 2 This is a schematic diagram of a single jig structure of the standardized adjustable jig for the overall assembly of steel box girders proposed in this invention.

[0025] Figure 3 This is a schematic diagram of the exploded structure of the ground rail and support box of the standardized adjustable jig for the overall assembly of steel box girders proposed in this invention.

[0026] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0027] Figure 5 This is a schematic diagram of a partial cross-section of the crossbeam of the standardized adjustable jig for the assembly of steel box girders proposed in this invention.

[0028] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0029] Figure 7 for Figure 5 Enlarged structural diagram at point C;

[0030] Figure 8 This is a partial cross-sectional view of the fixed cylinder structure of the standardized adjustable jig for the overall assembly of steel box girders proposed in this invention.

[0031] Figure 9 This is a schematic diagram of the diagonal bracing frame structure of the standardized adjustable jig for the overall assembly of steel box girders proposed in this invention. Figure 1 ;

[0032] Figure 10 This is a schematic diagram of the diagonal bracing frame structure of the standardized adjustable jig for the overall assembly of steel box girders proposed in this invention. Figure 2 .

[0033] In the diagram: 11. Crossbeam; 12. Vertical beam; 13. Leg box; 14. Support wheel; 15. Ground rail; 21. Divider plate; 22. Fixed rack; 23. Drive motor; 24. Drive gear; 31. Through port; 32. Limit rack; 33. Guide port one; 34. Connecting frame; 41. Fixed cylinder; 42. Push screw; 43. Threaded sleeve; 44. Push rod; 45. Fitting gear ring; 46. Pressure rod; 47. Drive 48. Moving rack; 49. Spring 1; 40. Clearance opening; 410. Pressure plate; 411. Clearance ring groove; 51. Diagonal brace frame; 52. Slide plate; 53. Guide opening 2; 54. Guide seat; 55. Adjusting screw; 56. Adjusting wheel; 61. Top rod; 62. Stabilizing frame; 63. Locking block; 64. Linkage wedge block; 65. Locking plate; 66. Spring 2; 67. Electric push rod; 68. Drive wedge block; 69. Spring 3. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Reference Figure 1-3 The steel box girder assembly is a standardized adjustable jig, including several crossbeams 11 and two vertical beams 12 symmetrically fixed on the top surface of the crossbeams 11. Two support legs 13 are symmetrically fixed on the bottom surface of the crossbeams 11. Support wheels 14 are rotatably installed on the side of the support legs 13. A ground rail 15 corresponding to the two sets of support wheels 14 is set directly below the crossbeams 11. The bottom surface of the support legs 13 is in contact with the top surface of the ground rail 15. A drive structure is set between the support legs 13 and the ground rail 15. The top of the two vertical beams 12 located on the same crossbeam 11 is hinged with a diagonal brace frame 51.

[0036] The drive structure includes a partition plate 21 fixedly installed on the bottom surface of the ground rail 15 corresponding to the support wheel 14. A fixed rack 22 is fixedly installed on the side of the partition plate 21. A drive motor 23 is fixedly installed on the inner wall of several outrigger boxes 13 located on the same side. A drive gear 24 that meshes with the fixed rack 22 is fixedly installed at the output end of the drive motor 23.

[0037] During use, before assembling the steel box girder, on-site personnel can adjust the spacing of several crossbeams 11 according to the condition of the steel box girder segments. During adjustment, the drive motor 23 in the support leg box 13 can be turned on to drive the drive gear 24 to rotate. When the drive gear 24 rotates, it meshes with the fixed rack 22 on the side of the partition plate 21, and then slides through the ground rail 15 under the action of the fixed rack 22. This allows the spacing between several crossbeams 11 to be adjusted so that different steel box girder segments can be placed. Furthermore, during adjustment, the spacing of the crossbeams 11 between two steel box girder segments can be adjusted according to the overall welding situation to ensure splicing accuracy and allow construction personnel and equipment to enter the beam segment from the side gap, which is convenient for operation and improves construction safety and work efficiency.

[0038] Reference Figure 3-8 The crossbeam 11 is provided with a limiting component corresponding to the driving structure. The limiting component includes an opening 31 on the side of the ground rail 15. Several limiting racks 32 corresponding to the crossbeam 11 are slidably installed on the inner wall of the opening 31. A guide opening 33 is opened on the bottom surface of the crossbeam 11. A connecting frame 34 is slidably installed on the inner wall of the guide opening 33. The bottom end of the connecting frame 34 is fixedly connected to the side of the limiting racks 32. A linkage structure corresponding to the connecting frame 34 is provided on the inner side of the crossbeam 11.

[0039] The linkage structure includes a fixed cylinder 41 fixedly installed on the inner bottom surface of the crossbeam 11. A push screw 42 is slidably installed on the inner wall of the fixed cylinder 41 via a sliding groove and a slider. A threaded sleeve 43 is rotatably installed at the open end of the fixed cylinder 41, and the threaded sleeve 43 is screwed to the push screw 42. A push rod 44 is fixedly installed at one end of the push screw 42 located outside the fixed cylinder 41, and the end of the push rod 44 is fixedly connected to the top end of the connecting frame 34. The outer wall of the threaded sleeve 43 is fixedly fitted with a push rod 44. The crossbeam 11 has a gear ring 45 and a pressure rod 46 that runs through the top surface. A drive rack 47 that meshes with the gear ring 45 is fixedly installed at the bottom end of the pressure rod 46. A spring 48 is fixedly installed between the bottom surface of the pressure rod 46 and the inner bottom surface of the crossbeam 11. The bottom surface of the crossbeam 11 has a relief opening 49 corresponding to the drive rack 47. A pressure plate 410 is fixedly installed at the top end of the pressure rod 46. The top surface of the crossbeam 11 has a relief ring groove 411 corresponding to the pressure plate 410.

[0040] After adjusting several crossbeams 11, workers can use hoisting equipment to hoist the steel box girder segments onto the crossbeams 11. When the steel box girder segments are in place, the bottom surface of the steel box girder segments can press against the pressure plate 410, thereby causing the pressure rod 46 to move downwards and drive the drive rack 47 to slide along the relief opening 49. When the drive rack 47 slides, it can drive the sleeve gear ring 45 to rotate, and the threaded sleeve 43 can rotate synchronously. Because the pushing screw 42 and the inner wall of the fixed cylinder 41 are connected by a sliding groove, The slider is slidably connected, and the push screw 42 is screwed to the threaded sleeve 43. Therefore, when the threaded sleeve 43 rotates, it can drive the push screw 42 and the push rod 44 to move and push the connecting frame 34. When the connecting frame 34 is pushed, it can slide along the guide port 33 and push the limiting rack 32, so that several limiting racks 32 can mesh with several driving gears 24 respectively, thereby locking the driving gears 24 and ensuring that several crossbeams 11 are fixed in position, providing stable support for the steel box girder segment.

[0041] Reference Figure 7 , Figure 9 and Figure 10 A support assembly is provided between the diagonal brace frame 51 and the crossbeam 11. The support assembly includes a slide plate 52 that is slidably installed on the inner wall of the bottom end of the diagonal brace frame 51. Two guide openings 53 are symmetrically opened on the top surface of the crossbeam 11. A guide seat 54 is slidably installed on the inner wall of the guide opening 53. The top surface of the guide seat 54 is hinged to the bottom end of the slide plate 52. An adjusting screw 55 is rotatably installed on the inner wall of the crossbeam 11. Both guide seats 54 are screwed to the adjusting screw 55. The threads on both sides of the outer wall of the adjusting screw 55 are opposite. One end of the adjusting screw 55 passes through the side of the crossbeam 11 and is fixedly installed with an adjusting wheel 56.

[0042] Before the steel box girder segments are hoisted, workers can adjust the angle of the diagonal bracing frame 51 according to the side plate condition of the steel box girder to provide stable support and limit the position of the steel box girder. Specifically, workers can rotate the adjusting wheel 56. When the adjusting wheel 56 rotates, it can drive the adjusting screw 55 to rotate. Since the threads on both sides of the outer wall of the adjusting screw 55 are opposite and are screwed to the guide seat 54, when the adjusting screw 55 rotates, it can drive the two guide seats 54 located on the same crossbeam 11 to slide in opposite directions along the guide opening 2 53. And through the sliding of the sliding plate 52 on the inner wall of the diagonal bracing frame 51, it drives the diagonal bracing frame 51 to rotate, thereby realizing the adjustment of the angle of the diagonal bracing frame 51.

[0043] Reference Figure 9 and Figure 10The diagonal bracing frame 51 is equipped with a locking assembly corresponding to the steel box girder. The locking assembly includes several top rods 61 arranged in a linear array through the side of the diagonal bracing frame 51. A stabilizing frame 62 is hinged to one end of the top rod 61 on the outside of the diagonal bracing frame 51. A locking block 63 is fixedly installed at the other end of the top rod 61 away from the stabilizing frame 62. A spring 69 is fixedly installed between the side of the locking block 63 and the inner wall of the diagonal bracing frame 51. A linkage wedge 64 is provided through the side of the diagonal bracing frame 51. A locking plate 65 corresponding to the locking block 63 is fixedly installed at one end of the linkage wedge 64 on the inside of the diagonal bracing frame 51. Anti-slip textures are provided on the opposite sides of the locking block 63 and the locking plate 65. Two springs 66 are symmetrically fixedly installed between the side of the locking plate 65 and the inner wall of the diagonal bracing frame 51. An electric push rod 67 is fixedly installed on the side of the diagonal bracing frame 51. A drive wedge 68 corresponding to the linkage wedge 64 is fixedly installed at the telescopic end of the electric push rod 67.

[0044] After the steel box girder segment is hoisted, under the support of spring 69, the stabilizing frame 62 at the end of the top rod 61 can fit against the side plate of the steel box girder. The positions of several top rods 61 can be adjusted according to the condition of the side plate to ensure that the side of the stabilizing frame 62 fits against the side plate of the steel box girder, providing stable support. Then, the electric push rod 67 can be extended to move the drive wedge 68. When the drive wedge 68 moves, it can move the linkage wedge 64 and push the locking plate 65. When the locking plate 65 is pushed, it can fit against the sides of several locking blocks 63 and form an interference fit. The anti-slip texture locks the locking blocks 63, ensuring that the positions of the top rod 61 and the stabilizing frame 62 are fixed. Then, stable welding work can be carried out on the steel box girder segment to complete the overall assembly of the steel box girder.

[0045] The specific working principle of this invention is as follows:

[0046] During use, before the on-site staff begin the final assembly of the steel box girder, they can adjust the spacing of several crossbeams 11 according to the condition of the steel box girder segments. During adjustment, the drive motor 23 in the leg box 13 can be turned on to drive the drive gear 24 to rotate. When the drive gear 24 rotates, it meshes with the fixed rack 22 on the side of the partition plate 21, and then slides through the ground rail 15 under the action of the fixed rack 22. This allows the spacing between several crossbeams 11 to be adjusted so that different steel box girder segments can be placed. Furthermore, during adjustment, the spacing of the crossbeams 11 between two steel box girder segments can be adjusted according to the final assembly welding condition to ensure splicing accuracy and allow construction personnel and equipment to enter the beam segment from the side gap, facilitating operation and improving both construction safety and work efficiency.

[0047] After adjusting several crossbeams 11, workers can use hoisting equipment to hoist the steel box girder segments onto the crossbeams 11. When the steel box girder segments are in place, the bottom surface of the steel box girder segments can press against the pressure plate 410, thereby causing the pressure rod 46 to move downwards and drive the drive rack 47 to slide along the relief opening 49. When the drive rack 47 slides, it can drive the sleeve gear ring 45 to rotate, and the threaded sleeve 43 can rotate synchronously. Because the pushing screw 42 and the inner wall of the fixed cylinder 41 are connected by a sliding groove, The slider is slidably connected, and the push screw 42 is screwed to the threaded sleeve 43. Therefore, when the threaded sleeve 43 rotates, it can drive the push screw 42 and the push rod 44 to move and push the connecting frame 34. When the connecting frame 34 is pushed, it can slide along the guide port 33 and push the limiting rack 32, so that several limiting racks 32 can mesh with several driving gears 24 respectively, thereby locking the driving gears 24 and ensuring that several crossbeams 11 are fixed in position, providing stable support for the steel box girder segment.

[0048] Before the steel box girder segment is hoisted, the staff can adjust the angle of the diagonal bracing frame 51 according to the side plate condition of the steel box girder so as to provide stable support and limit the position of the steel box girder. Specifically, the staff can rotate the adjusting wheel 56. When the adjusting wheel 56 rotates, it can drive the adjusting screw 55 to rotate. Since the threads on both sides of the outer wall of the adjusting screw 55 are opposite and are screwed to the guide seat 54, when the adjusting screw 55 rotates, it can drive the two guide seats 54 located on the same crossbeam 11 to slide in opposite directions along the guide opening 2 53. And through the sliding of the sliding plate 52 on the inner wall of the diagonal bracing frame 51, the diagonal bracing frame 51 is driven to rotate, thereby realizing the adjustment of the angle of the diagonal bracing frame 51.

[0049] After the steel box girder segment is hoisted, under the support of spring 69, the stabilizing frame 62 at the end of the top rod 61 can fit against the side plate of the steel box girder. The positions of several top rods 61 can be adjusted according to the condition of the side plate to ensure that the side of the stabilizing frame 62 fits against the side plate of the steel box girder, providing stable support. Then, the electric push rod 67 can be extended to move the drive wedge 68. When the drive wedge 68 moves, it can move the linkage wedge 64 and push the locking plate 65. When the locking plate 65 is pushed, it can fit against the sides of several locking blocks 63 and form an interference fit. The anti-slip texture locks the locking blocks 63, ensuring that the positions of the top rod 61 and the stabilizing frame 62 are fixed. Then, stable welding work can be carried out on the steel box girder segment to complete the overall assembly of the steel box girder.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A standardized adjustable jig for the assembly of steel box girders, comprising several crossbeams (11) and two vertical beams (12) symmetrically fixedly installed on the top surface of the crossbeams (11), wherein two support leg boxes (13) are symmetrically fixedly installed on the bottom surface of the crossbeams (11), and support wheels (14) are rotatably installed on the side of the support leg boxes (13), and ground rails (15) corresponding to the two sets of support wheels (14) are provided directly below the crossbeams (11), characterized in that, A driving structure is provided between the outrigger box (13) and the ground rail (15). A limiting component corresponding to the driving structure is provided on the crossbeam (11). The top ends of the two vertical beams (12) located on the same crossbeam (11) are hinged with diagonal bracing frames (51). A support component is provided between the diagonal bracing frame (51) and the crossbeam (11). A locking component corresponding to the steel box girder is provided on the diagonal bracing frame (51). The drive structure includes a partition plate (21) fixedly installed on the bottom surface of the ground rail (15) corresponding to the support wheel (14). A fixed rack (22) is fixedly installed on the side of the partition plate (21). A drive motor (23) is fixedly installed on the inner wall of several support leg boxes (13) located on the same side. A drive gear (24) meshing with the fixed rack (22) is fixedly installed at the output end of the drive motor (23). The locking assembly includes a plurality of top rods (61) arranged in a linear array through the side of the diagonal brace frame (51). A stabilizing frame (62) is hinged to one end of each top rod (61) located outside the diagonal brace frame (51). A locking block (63) is fixedly installed at the end of each top rod (61) away from the stabilizing frame (62). A spring (69) is fixedly installed between the side of the locking block (63) and the inner wall of the diagonal brace frame (51). A linkage wedge (64) is provided through the side of the diagonal brace frame (51). 64) A locking plate (65) corresponding to the locking block (63) is fixedly installed at one end of the diagonal brace frame (51). Anti-slip textures are provided on the sides of the locking block (63) and the locking plate (65). Two springs (66) are symmetrically fixedly installed between the side of the locking plate (65) and the inner wall of the diagonal brace frame (51). An electric push rod (67) is fixedly installed on the side of the diagonal brace frame (51). A drive wedge (68) corresponding to the linkage wedge (64) is fixedly installed at the telescopic end of the electric push rod (67).

2. The standardized adjustable jig for the overall assembly of steel box girders according to claim 1, characterized in that, The bottom surface of the outrigger box (13) is in contact with the top surface of the ground rail (15).

3. The standardized adjustable jig for the overall assembly of steel box girders according to claim 1, characterized in that, The limiting component includes an opening (31) on the side of the ground rail (15). Several limiting racks (32) corresponding to the crossbeam (11) are slidably installed on the inner wall of the opening (31). A guide opening (33) is opened on the bottom surface of the crossbeam (11). A connecting frame (34) is slidably installed on the inner wall of the guide opening (33). The bottom end of the connecting frame (34) is fixedly connected to the side of the limiting rack (32). A linkage structure corresponding to the connecting frame (34) is provided on the inner side of the crossbeam (11).

4. The standardized adjustable jig for the overall assembly of steel box girders according to claim 3, characterized in that, The linkage structure includes a fixed cylinder (41) fixedly installed on the inner bottom surface of the crossbeam (11). A push screw (42) is slidably installed on the inner wall of the fixed cylinder (41) through a sliding groove and a slider. A threaded sleeve (43) is rotatably installed on the open end of the fixed cylinder (41), and the threaded sleeve (43) is screwed to the push screw (42). A push rod (44) is fixedly installed on one end of the push screw (42) located outside the fixed cylinder (41), and the end of the push rod (44) is fixedly connected to the top of the connecting frame (34). A sleeve gear ring (45) is fixedly fitted on the outer wall of the threaded sleeve (43). A pressure rod (46) is provided through the top surface of the crossbeam (11). A drive rack (47) that meshes with the sleeve gear ring (45) is fixedly installed on the bottom end of the pressure rod (46). A spring (48) is fixedly installed between the bottom surface of the pressure rod (46) and the inner bottom surface of the crossbeam (11).

5. The standardized adjustable jig for the overall assembly of steel box girders according to claim 4, characterized in that, The bottom surface of the crossbeam (11) is provided with a clearance opening (49) corresponding to the drive rack (47).

6. The standardized adjustable jig for the overall assembly of steel box girders according to claim 4, characterized in that, The top of the pressure bar (46) is fixedly installed with a pressure plate (410), and the top surface of the crossbeam (11) is provided with a relief annular groove (411) corresponding to the pressure plate (410).

7. The standardized adjustable jig for the overall assembly of steel box girders according to claim 1, characterized in that, The support assembly includes a slide plate (52) that is slidably installed on the inner wall of the bottom end of the diagonal brace frame (51). The top surface of the crossbeam (11) has two guide openings (53) symmetrically opened. The inner wall of the guide openings (53) is slidably installed with guide seats (54). The top surface of the guide seats (54) is hinged to the bottom end of the slide plate (52). The inner wall of the crossbeam (11) is rotatably installed with an adjusting screw (55), and both guide seats (54) are screwed to the adjusting screw (55).

8. The standardized adjustable jig for the overall assembly of steel box girders according to claim 7, characterized in that, The threads on both sides of the outer wall of the adjusting screw (55) are opposite, and one end of the adjusting screw (55) passes through the side of the crossbeam (11) and is fixedly installed with an adjusting wheel (56).

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