Jig frame for assembling and welding and construction system and construction method for assembling steel box girders

Abstract

The invention belongs to the technical field of steel box girder assembly construction, and particularly relates to a jig frame for assembly welding, a construction system for steel box girder assembly and a construction method.The jig frame for assembly welding comprises a plurality of jig frame units, each jig frame unit comprises an inclined strut and a movable steel beam, and each jig frame unit further comprises a first supporting block; the middle of the movable steel beam is installed on a first supporting block, the first supporting block is provided with a lifting device and a rotating device, and the lifting device can drive the movable steel beam to automatically ascend and descend. The slewing device can drive the movable steel beam to automatically rotate; compared with the prior art, the construction method for assembling the steel box girder has the advantages that manual operation can be further reduced, and the assembling efficiency of the steel box girder is greatly improved; the middle of the movable steel beam is installed on the rotating disc of the rotating device, and the phenomena that the hinged portion deforms and is damaged and the cantilever portion of the movable steel beam droops due to the fact that the end of the movable steel beam is hinged to the first supporting block are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of steel box girder assembly construction, and particularly relates to a cradle for assembly welding, a steel box girder assembly construction system and a construction method. Background Art

[0002] Steel box girder is a structural element commonly used in bridge construction. The assembly of steel box girders is a systematic work process, which can be called the construction process for assembling steel box girders.

[0003] The main steps of the construction process for assembling steel box girders are as follows: in the prefabrication stage, the steel box girders are cut and plate units are made in the factory; in transportation and on-site matching assembly, the plate units of the steel box girders are transported to the bottom of the bridge through relevant equipment, the bracket is erected, and a cradle for assembly and welding is set up next to the pier as an assembly platform, and 3+1 matching assembly is carried out on the assembly platform; on-site installation, method one, a large crane is used to directly lift the beam section, method two, the jacking construction method, method three, cantilever assembly, which is suitable for cable-stayed bridges.

[0004] However, matching and assembling the steel box girder segments on the cradle at the construction site loses the advantage of factory prefabrication, and the work efficiency is greatly reduced. There are many reasons for the low efficiency of matching and assembling on the cradle. One of the reasons is that the steel box girder is generally transported by hydraulic beam transporter. In order to ensure that the beam transporter can smoothly complete the operations such as entry and exit, jacking, beam dropping, and walking, the beam above the beam transport channel in the cradle needs to be set as a movable beam. The two ends of the movable beam are detachably connected to the cradle through splicing plates and high-strength bolts. After the steel box girder segments are assembled, the movable beam is supported by a small forklift, and the splicing plates on both sides of the movable beam are manually removed. Then, the movable beam is moved to an open space for storage by a small forklift. This process requires a lot of manpower and mechanical coordination, and the efficiency is low. Summary of the Invention

[0005] The present invention aims to solve the technical problem of low efficiency in matching and assembling steel box beam sections on a cradle at a construction site in the prior art, and provides a cradle for assembly welding, a construction system for assembling steel box beams, and a construction method.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: a tread frame for assembly welding, comprising a plurality of tread frame units, each tread frame unit comprising a diagonal brace and a movable steel beam, the tread frame unit further comprising a first support block; the middle portion of the movable steel beam is mounted on the first support block, the first support block being equipped with a lifting device and a rotating device, the lifting device being capable of driving the movable steel beam to automatically rise and fall; the rotating device being capable of driving the movable steel beam to automatically rotate; In the working state, one end of the movable steel beam on the support block 1 close to the diagonal brace is overlapped with the inner side of the diagonal brace and fixed through a connecting piece; an oblique wedge support mechanism is installed on the side of the diagonal brace close to the movable steel beam.

[0007] Preferably, the inclined wedge support mechanism includes a vertical slider, a horizontal wedge block and a telescopic rod; a vertical sleeve is fixedly connected to the inner side of the inclined support, and the vertical slider is slidably connected to the inner wall of the vertical sleeve; the lower end of the vertical slider is a wedge-shaped portion, and the inclined surface of the wedge-shaped portion fits the inclined surface of the horizontal wedge block; the bottom end of the vertical sleeve is higher than the surface of the working platform; the horizontal wedge block is drivingly connected to the telescopic rod on the side away from the vertical sleeve.

[0008] Preferably, the support block 1 includes a concrete block 1; the lifting device includes a telescopic rod 2 and a mounting plate, the telescopic rod 2 is vertically installed in the center of the concrete block 1, the piston rod of the telescopic rod 2 can extend upward from the concrete block 1 and the end of the piston rod of the telescopic rod 2 is horizontally fixedly connected to the mounting plate.

[0009] Preferably, the slewing device includes an external tooth slewing bearing and a worm, the inner ring of the external tooth slewing bearing is detachably connected to the upper surface of the mounting plate, the outer ring of the external tooth slewing bearing is engaged with the worm, and one end of the worm is connected to the motor drive; a turntable is fixedly connected to the upper surface of the outer ring of the external tooth slewing bearing, and the middle part of the movable steel beam is detachably connected to the turntable.

[0010] Preferably, the upper surface of the concrete block 1 is also slidably connected to a pair of pads 1, and the pads 1 are graded pads; the outer side of each pad 1 is drivably connected to a telescopic rod 3; the pad 1 can slide to the bottom of the mounting plate and support the mounting plate under the drive of the telescopic rod 3.

[0011] Preferably, it also includes support block 2, which includes two sets of support mechanisms, each set of support mechanisms includes concrete block 2, telescopic rod 4, support plate and a pair of pad blocks 2; the pad blocks 2 are graded pads; the telescopic rod 4 is vertically installed in the concrete block 2, the piston rod of the telescopic rod 4 can extend upward from the concrete block 2 and the piston rod end of the telescopic rod 4 is horizontally fixedly connected to the support plate; the outer side of each pad block 2 is driven and connected with a telescopic rod 5; the pad block 2 can slide to the bottom of the support plate and support the support plate under the drive of the telescopic rod 5.

[0012] A construction system for assembling steel box girders, comprising an assembly yard, a lifting unit, and a beam transport flat car; An assembly yard, comprising the assembly welding jig as claimed in the claim, the jig comprising four jig units arranged in sequence, the arrangement direction of the four jig units being perpendicular to the erection direction of the bridge, the assembly yard being located below the side of the bridge, the length direction of the jig units being perpendicular to the erection direction of the bridge; A lifting unit is located at the front end of the bridge under construction; the lifting unit includes a first gantry crane, the first gantry crane is provided with a track, and a beam transportation area and a beam storage area are provided between the track and the assembly yard.

[0013] Preferably, the end of the assembly field away from the lifting unit is a storage area.

[0014] A steel box girder assembly construction method, which utilizes the steel box girder assembly construction system to perform steel box girder assembly construction, comprises the following steps: Step 1: Use four sequentially arranged jig units for 3+1 matching assembly; after placing the new steel box girder segment on the jig unit near the stocking area, use a total station to check the actual elevation and alignment of the movable crossbeam, adjust the movable crossbeam to the target position using telescopic rods 2 and 4, then select matching pad 1 to support the mounting plate, and select matching pad 2 to support the support plate; Step 2: After the new beam segment is matched, the steel box beam segment of the cradle unit close to the lifting unit is transported to the beam transport area and the beam storage area by the beam transport flat car; the steel box beam segments of the other three cradle units are moved forward in turn; Step 3: Use the first gantry crane to lift the steel box girder sections to the bridge location, complete the permanent connection of the steel box girder at the bridge location, and form a continuous beam body.

[0015] Preferably, when the beam section of the steel box beam of the tire frame unit is transferred by the beam transport flat car in step 2, the telescopic rod 3 on the support block 1 close to the diagonal brace drives the pad 1 to move and release the support for the mounting plate, and the corresponding telescopic rod 5 on the support block 2 close to the diagonal brace drives the pad 2 to move and release the support for the support plate, and at the same time, the telescopic rod 1 drives the horizontal wedge block to move so that the vertical slider descends; then the telescopic rod 2 close to the diagonal brace descends until the concrete block 1 close to the diagonal brace supports the mounting plate; then the telescopic rod 4 close to the diagonal brace descends until the concrete block 2 close to the diagonal brace supports the corresponding support plate, and then the motor on the support block 1 close to the diagonal brace drives the turntable and the movable crossbeam on the turntable to rotate 90 degrees; then the beam transport flat car moves from the inside of the diagonal brace to the bottom of the beam section.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: (1) In the steel box girder assembly construction method, when a beam transport flat car is used to transport the steel box girder section of the tire frame unit, the telescopic rod three on the support block one close to the diagonal brace drives the cushion block one to move and release the support for the mounting plate, and the corresponding telescopic rod five on the support block two close to the diagonal brace drives the cushion block two to move and release the support for the supporting plate, and at the same time, the telescopic rod one drives the horizontal wedge block to move so that the vertical slider descends; then the telescopic rod two close to the diagonal brace descends until the concrete block one close to the diagonal brace supports the mounting plate; then the motor drives the turntable and the movable crossbeam on the turntable to rotate 90 degrees; then the beam transport flat car moves from the inner side of the diagonal brace to the bottom of the beam section; this further reduces manual operations and greatly improves the efficiency of steel box girder assembly; (2) When the steel box beam section on the frame unit is transported by a beam transport flat car, the rotating device of the support block 1 near the diagonal brace drives the movable steel beam to rotate, and the middle part of the movable steel beam is installed on the turntable of the rotating device, thereby avoiding deformation and damage of the hinge part caused by the end of the movable steel beam being hinged on the support block 1 and sagging of the cantilever part of the movable steel beam (due to the dead weight of the movable steel beam, the hinge point is subjected to a large bending moment); (3) After placing the new steel box girder section on the cradle unit near the stocking area, use a total station to detect the actual elevation and line shape of the movable crossbeam, adjust the movable crossbeam to the target position by using telescopic rods 2 and 4, and then select the matching pad 1 to support the mounting plate, and select the matching pad 2 to support the support plate; the steel box girder assembly construction method of the present invention greatly facilitates the precision control of the matching assembly of the beam sections, improves the adjustment efficiency of the movable steel beam, and realizes the switching between temporary support (support by telescopic rods 2 and 4) and fixed support (support by concrete block 1 and concrete block 2) by moving pads 1 and 2; (4) When the steel box beam section on the tire frame unit is transported by a beam transport flat car, the telescopic rod drives the horizontal wedge block to move so that the vertical slider descends; (5) After adjusting the elevation of the movable crossbeam, the combination of support block 1 and pad 1 can be used to fix the movable crossbeam, which is very energy-saving; (6) Support block 2 includes two sets of support mechanisms. When the rotary device on support block 1 close to the diagonal support is about to drive the movable crossbeam to rotate, the corresponding support mechanism on support block 2 is activated (telescopic rod 4 is lowered). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments: Figure 1 This is a schematic diagram of a tire frame for assembly and welding; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 Schematic diagram of the diagonal brace for the tire frame unit; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 Schematic diagram of the vertical slider in the wedge support mechanism; Figure 6 Schematic diagram of the support block in the tire frame unit Figure 1 ; Figure 7 Schematic diagram of the support block in the tire frame unit Figure 2 ; Figure 8 Schematic diagram of the support block in the tire frame unit Figure 3 ; Figure 9 Schematic diagram of the support block in the tire frame unit Figure 4 ; Figure 10 Schematic diagram of the support block - external gear slewing bearing and turntable Figure 1 ; Figure 11 Schematic diagram of the support block - external gear slewing bearing and turntable Figure 2 ; Figure 12 This is a schematic diagram of support block 2; Figure 13 Schematic diagram of the construction system for box girder assembly.

[0018] Description of reference numerals: 1. diagonal brace, 101. vertical sleeve; 2. Support block 1, 21. Concrete block 1, 22. Spacer block 1, 23. Mounting plate, 24. External gear slewing bearing, 25. Worm, 26. Telescopic rod 2, 27. Telescopic rod 3, 28. Turntable; 3. Support block 2, 31. Concrete block 2, 32. Spacer block 2, 33. Telescopic rod 5, 34. Support plate, 35. Telescopic rod 4; 4. Movable crossbeam; 5. Inclined wedge support mechanism, 51. Vertical slider, 52. Horizontal wedge block, 53. Telescopic rod 1. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Example 1 The following further describes a tire frame for assembly welding in Example 1 with reference to the accompanying drawings. Figure 1 As shown, it includes multiple tire frame units, each tire frame unit includes a diagonal brace 1 and a movable steel beam 4, and the tire frame unit also includes a support block 2; the middle part of the movable steel beam 4 is installed on the support block 2, and the support block 2 is equipped with a lifting device and a rotating device, the lifting device can drive the movable steel beam 4 to automatically rise and fall; the rotating device can drive the movable steel beam 4 to automatically rotate.

[0022] like Figure 2 As shown, in the working state, one end of the movable steel beam 4 on the support block 2 close to the diagonal brace 1 is overlapped with the inner side of the diagonal brace 1 and fixed through a connecting piece; an inclined wedge support mechanism 5 is installed on the side of the diagonal brace 1 close to the movable steel beam 4.

[0023] like Figures 2 to 5 As shown, the oblique wedge support mechanism 5 includes a vertical slider 51, a horizontal wedge block 52 and a telescopic rod 53; a vertical sleeve 101 is fixedly connected to the inner side of the oblique support 1, and the vertical slider 51 is slidably connected to the inner wall of the vertical sleeve 101; the lower end of the vertical slider 51 is a wedge-shaped portion, and the inclined surface of the wedge-shaped portion fits the inclined surface of the horizontal wedge block 52; the bottom end of the vertical sleeve 101 is higher than the surface of the working platform; the horizontal wedge block 52 is drivingly connected to the telescopic rod 53 on the side away from the vertical sleeve 101.

[0024] like Figures 6 to 9 As shown, the support block 2 includes a concrete block 21; the lifting device includes a telescopic rod 26 and a mounting plate 23, the telescopic rod 26 is vertically installed in the center of the concrete block 21, the piston rod of the telescopic rod 26 can extend upward from the concrete block 21 and the end of the piston rod of the telescopic rod 26 is horizontally fixedly connected to the mounting plate 23.

[0025] like Figure 10 and Figure 11 As shown, the slewing device includes an external gear slewing bearing 24 and a worm 25. The inner ring of the external gear slewing bearing 24 is detachably connected to the upper surface of the mounting plate 23. The outer ring of the external gear slewing bearing 24 is engaged with the worm 25. One end of the worm 25 is connected to the motor drive. A turntable 28 is fixedly connected to the upper surface of the outer ring of the external gear slewing bearing 24. The middle part of the movable steel beam 4 is detachably connected to the turntable 28.

[0026] like Figure 7 As shown, a pair of pads 22 are also slidably connected to the upper surface of the concrete block 21, and the pads 22 are graded pads; the outer side of each pad 22 is driven and connected to a telescopic rod 3 27; the pads 22 can slide to the bottom of the mounting plate 23 and support the mounting plate 23 under the drive of the telescopic rod 3 27.

[0027] like Figure 1 and Figure 12As shown, the assembly welding frame also includes a support block 2 3, which includes two sets of support mechanisms, each set of which includes a concrete block 2 31, a telescopic rod 4 35, a support plate 34 and a pair of pads 2 32; the pads 2 32 are graded pads; the telescopic rod 4 35 is vertically installed in the concrete block 2 31, and the piston rod of the telescopic rod 4 35 can extend upward from the concrete block 2 31 and the piston rod end of the telescopic rod 4 35 is horizontally fixedly connected to the support plate 34; the outer side of each pad 2 32 is driven and connected with a telescopic rod 5 33; the pad 2 32 can slide to the bottom of the support plate 34 and support the support plate 34 under the drive of the telescopic rod 5 33.

[0028] In this embodiment, the telescopic rod 1 53 , the telescopic rod 2 26 , the telescopic rod 3 27 , the telescopic rod 4 35 and the telescopic rod 5 33 are all electric telescopic rods.

[0029] A construction system for assembling steel box beams, such as Figure 13 As shown, it includes an assembly site 10, a lifting unit 20 and a beam transport flat car.

[0030] Assembly yard 10 includes the assembly welding jig of claim 6. The jig comprises four jig units 101 arranged in sequence. The four jig units 101 are arranged perpendicular to the direction of bridge erection. Assembly yard 10 is located below and to the side of the bridge. The length of the jig units 101 is perpendicular to the direction of bridge erection. The end of assembly yard 10 away from lifting unit 20 is a material storage area 102.

[0031] The lifting unit 20 is located at the front end of the bridge under construction; the lifting unit 20 includes a first gantry crane 201, the first gantry crane 201 is provided with a track 2011, and a beam transport area 203 and a beam storage area 202 are provided between the track 2011 and the assembly yard 10.

[0032] A steel box girder assembly construction method, which utilizes the above-mentioned steel box girder assembly construction system to perform steel box girder assembly construction, comprises the following steps: Step 1: Use four sequentially arranged jig units 101 to perform 3+1 matching assembly; after placing the new steel box girder segment on the jig unit 101 near the stocking area 102, use a total station to check the actual elevation and alignment of the movable crossbeam 4, adjust the movable crossbeam 4 to the target position using the telescopic rod 26 and the telescopic rod 4 35, then select the matching pad 1 22 to support the mounting plate 23, and select the matching pad 2 32 to support the support plate 34; Step 2: After the new beam segment is matched, the steel box beam segment of the cradle unit 101 close to the lifting unit 20 is transported to the beam transport area 203 and the beam storage area 202 by a beam transport flat car; the steel box beam segments of the other three cradle units 101 are moved forward in sequence; Step 3: Use the first gantry crane 201 to lift the steel box girder segments to the bridge location, and complete the permanent connection of the steel box girder at the bridge location to form a continuous beam body.

[0033] When the beam section of the steel box beam of the tire frame unit 101 is transported by the beam transport flat car in step 2, the telescopic rod three 27 on the support block one 2 close to the diagonal brace 1 drives the pad one 22 to move and release the support for the mounting plate 23, and the corresponding telescopic rod five 33 on the support block two 3 close to the diagonal brace 1 drives the pad two 32 to move and release the support for the support plate 34, and at the same time, the telescopic rod one 53 drives the horizontal wedge block 52 to move so that the vertical slider 51 descends; then the telescopic rod two 26 close to the diagonal brace 1 descends until the concrete block one 21 close to the diagonal brace 1 supports the mounting plate 23; then the telescopic rod four 35 close to the diagonal brace 1 descends until the concrete block two 31 close to the diagonal brace 1 supports the corresponding support plate 34, and then the motor on the support block one 2 close to the diagonal brace 1 drives the turntable 28 and the movable crossbeam 4 on the turntable 28 to rotate 90 degrees; then the beam transport flat car moves from the inside of the diagonal brace 1 to the bottom of the beam section.

[0034] Example 2 The difference between this embodiment and embodiment 1 is that in this embodiment, telescopic rod 1 53 , telescopic rod 2 26 , telescopic rod 3 27 , telescopic rod 4 35 and telescopic rod 5 33 are all hydraulic cylinders.

[0035] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A tire frame for assembly welding, comprising a plurality of tire frame units, each of which comprises a diagonal brace (1) and a movable steel beam (4), characterized in that: The tire frame unit also includes a support block (2); the middle part of the movable steel beam (4) is installed on the support block (2); the support block (2) is equipped with a lifting device and a rotating device, the lifting device can drive the movable steel beam (4) to automatically rise and fall; the rotating device can drive the movable steel beam (4) to automatically rotate; In the working state, one end of the movable steel beam (4) on the support block (2) close to the diagonal brace (1) is overlapped with the inner side of the diagonal brace (1) and fixed through a connecting piece; an inclined wedge support mechanism (5) is installed on the side of the diagonal brace (1) close to the movable steel beam (4).

2. The assembly welding tire frame according to claim 1, characterized in that: The inclined wedge support mechanism (5) comprises a vertical slider (51), a horizontal wedge block (52) and a telescopic rod (53); a vertical sleeve (101) is fixedly connected to the inner side of the inclined support (1), and the vertical slider (51) is slidably connected to the inner wall of the vertical sleeve (101); the lower end of the vertical slider (51) is a wedge-shaped portion, and the inclined surface of the wedge-shaped portion is in contact with the inclined surface of the horizontal wedge block (52); the bottom end of the vertical sleeve (101) is higher than the surface of the working platform; the side of the horizontal wedge block (52) away from the vertical sleeve (101) is drivingly connected to the telescopic rod (53).

3. The assembly welding tire frame according to claim 2, characterized in that: The supporting block 1 (2) includes a concrete block 1 (21); the lifting device includes a telescopic rod 2 (26) and a mounting plate (23), wherein the telescopic rod 2 (26) is vertically mounted at the center of the concrete block 1 (21), the piston rod of the telescopic rod 2 (26) can extend upward from the concrete block 1 (21), and the end of the piston rod of the telescopic rod 2 (26) is horizontally fixedly connected to the mounting plate (23).

4. The assembly welding tire frame according to claim 3, characterized in that: The rotary device includes an external tooth rotary support (24) and a worm (25), the inner ring of the external tooth rotary support (24) is detachably connected to the upper surface of the mounting plate (23), the outer ring of the external tooth rotary support (24) is meshed with the worm (25), and one end of the worm (25) is connected to a motor drive; the upper surface of the outer ring of the external tooth rotary support (24) is fixedly connected to a turntable (28), and the middle part of the movable steel beam (4) is detachably connected to the turntable (28).

5. The assembly welding tire frame according to claim 4, characterized in that: The upper surface of the concrete block 1 (21) is also slidably connected to a pair of pad blocks 1 (22), and the pad blocks 1 (22) are graded pad blocks; the outer side of each pad block 1 (22) is drivingly connected to a telescopic rod 3 (27); the pad block 1 (22) can slide to the bottom of the mounting plate (23) and support the mounting plate (23) under the drive of the telescopic rod 3 (27).

6. The assembly welding tire frame according to claim 5, characterized in that: The invention also includes a support block 2 (3), wherein the support block 2 (3) includes two sets of support mechanisms, each set of the support mechanisms includes a concrete block 2 (31), a telescopic rod 4 (35), a support plate (34) and a pair of cushion blocks 2 (32); the cushion blocks 2 (32) are graded cushion blocks; the telescopic rod 4 (35) is vertically installed in the concrete block 2 (31), the piston rod of the telescopic rod 4 (35) can extend upward from the concrete block 2 (31) and the piston rod end of the telescopic rod 4 (35) is horizontally fixedly connected to the support plate (34); the outer side of each cushion block 2 (32) is driven by the telescopic rod 5 (33); the cushion block 2 (32) can slide to the bottom of the support plate (34) and support the support plate (34) under the drive of the telescopic rod 5 (33).

7. A construction system for assembling steel box beams, characterized in that: It includes an assembly yard (10), a lifting unit (20) and a beam transport flat car; An assembly yard (10), the assembly yard (10) comprising the assembly welding tire frame of claim 6, the tire frame comprising four tire frame units (101) arranged in sequence, the arrangement direction of the four tire frame units (101) being perpendicular to the erection direction of the bridge, the assembly yard (10) being located at the lower side of the bridge, the length direction of the tire frame units (101) being perpendicular to the erection direction of the bridge; A lifting unit (20) is provided, wherein the lifting unit (20) is located at the front end of the bridge under construction; the lifting unit (20) comprises a first gantry crane (201), the first gantry crane (201) is provided with a track (2011), and a beam transport area (203) and a beam storage area (202) are provided between the track (2011) and the assembly yard (10).

8. The steel box girder assembly construction system according to claim 7, characterized in that: The end of the assembly field (10) away from the lifting unit (20) is a material storage area (102).

9. A steel box girder assembly construction method, characterized in that: The steel box girder assembly construction system according to claim 8 is used to carry out the steel box girder assembly construction, comprising the following steps: Step 1: Use four sequentially arranged tire frame units (101) to perform 3+1 matching assembly; after placing the beam section of the new steel box beam on the tire frame unit (101) close to the storage area (102), use a total station to detect the actual elevation and line shape of the movable beam (4), adjust the movable beam (4) to the target position through the telescopic rod 2 (26) and the telescopic rod 4 (35), and then select the matching pad 1 (22) to support the mounting plate (23), and select the matching pad 2 (32) to support the support plate (34); Step 2: After the new beam segment is matched, the beam segment of the steel box beam of the cradle unit (101) close to the lifting unit (20) is transported to the beam transport area (203) and the beam storage area (202) by a beam transport flat car; the beam segments of the steel box beams of the other three cradle units (101) are moved forward in sequence; Step 3: hoisting the steel box girder sections to the bridge position by the first gantry crane (201), completing the permanent connection of the steel box girder at the bridge position to form a continuous beam body.

10. The steel box girder assembly construction method according to claim 9, characterized in that: In step 2, when the beam section of the steel box beam of the tire frame unit (101) is transported by a beam transport flat car, the telescopic rod three (27) on the support block one (2) close to the diagonal brace (1) drives the cushion block one (22) to move and release the support for the mounting plate (23), and the corresponding telescopic rod five (33) on the support block two (3) close to the diagonal brace (1) drives the cushion block two (32) to move and release the support for the support plate (34), and at the same time, the telescopic rod one (53) drives the horizontal wedge block (52) to move so that the vertical slider (51) descends; then The telescopic rod 2 (26) near the diagonal brace (1) is lowered until the concrete block 1 (21) near the diagonal brace (1) supports the mounting plate (23); then the telescopic rod 4 (35) near the diagonal brace (1) is lowered until the concrete block 2 (31) near the diagonal brace (1) supports the corresponding support plate (34); then the motor on the support block 1 (2) near the diagonal brace (1) drives the turntable (28) and the movable crossbeam (4) on the turntable (28) to rotate 90 degrees; then the beam transport flat car moves from the inner side of the diagonal brace (1) to the bottom of the beam section.

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