High-altitude butt-joint auxiliary device for steel box girder matched with notch and using method of high-altitude butt-joint auxiliary device

Abstract

The invention relates to the technical field of construction machinery, in particular to a high-altitude butt joint auxiliary device for a steel box girder provided with a notch and a using method, and the high-altitude butt joint auxiliary device comprises a steel column, a fixed sleeve, a movable sleeve, a supporting platform, a movable platform and a driving mechanism. The two sides of the movable sleeve are connected with a spliced supporting platform through supporting mechanisms, a movable platform is oppositely arranged at the top end of the supporting platform, the fixed sleeve is connected with the movable sleeve through a jacking mechanism, and the movable platform is connected with the supporting platform through a driving mechanism; during use, the height of the movable platforms is larger than that of the steel column, notch butt joint is completed through the two movable platforms, and after the notch butt joint is completed, the movable platforms are lower than the steel column when the jacking mechanism retracts. According to the auxiliary device, the traditional process that a crane is used for hoisting and manual operation is used for splicing the circular seam matched with the notch is replaced, the auxiliary device is used for moving the steel box girder to achieve splicing of the steel box girder matched with the notch, the butt joint precision is improved, and the engineering quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of construction machinery, and in particular to a high-altitude butt joint auxiliary device for steel box beam notches and a use method thereof. Background Art

[0002] As people's demand for steel bridges increases, people are no longer satisfied with their functional use, but also have higher requirements for the visual beauty of steel bridges and their ability to integrate with the surrounding environment. To meet this requirement, it is necessary to improve the manufacturing accuracy of individual components in steel bridges.

[0003] The processing and production of a single steel box girder component in a project includes transporting it to the site for hoisting, assembly and welding. In the past, the method of matching and splicing steel box girders was to use a crane to lift it, manually move the steel box girder for matching and splicing, and then weld it after alignment. This method has great safety hazards, low construction splicing efficiency, poor splicing accuracy, and is easy to affect the quality of the project. Summary of the invention

[0004] The present invention provides a high-altitude butt joint auxiliary device for steel box girder notches and a use method, which replaces the traditional process of using a crane to lift and manually operate the splicing of circumferential seam notches. The steel box girder is moved by the auxiliary device to achieve the splicing of the steel box girder notches, thereby improving the butt joint accuracy and ensuring the quality of the project.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A high-altitude docking auxiliary device for steel box beams with cutouts comprises a steel column, a fixed sleeve, a movable sleeve, a support platform, a mobile platform and a driving mechanism. The upper part of the steel column is fixedly sleeved with a fixed sleeve, the steel column above the fixed sleeve is slidably sleeved with a movable sleeve, both sides of the movable sleeve are connected with spliced ​​support platforms through a supporting mechanism, the tops of the support platforms are oppositely provided with movable platforms, the tops of the two movable platforms are used to load the steel box beams to be docked, the fixed sleeve is connected to the movable sleeve by a jacking mechanism, the movable platform is connected to the support platform by a driving mechanism, the height of the movable platform during operation is greater than the height of the steel column, and after the docking is completed, the movable platform is lower than the height of the steel column due to the retraction of the jacking mechanism.

[0007] Preferably, a plurality of ball seats are evenly embedded on the top of the mobile platform, steel balls are rotatably connected in the ball seats, and guardrails are also provided on the left and right ends of the upper surface of the mobile platform.

[0008] Preferably, an outer flange is provided at the top of the steel column and is fixedly connected to the spliced ​​steel box girder by bolts. A through hole is provided in the middle of the support platform, and the inner diameter of the through hole matches the outer diameter of the steel column and is smaller than the outer diameter of the outer flange. Semicircular holes are provided at the opposite ends of the two mobile platforms, and the inner diameter of the semicircular holes is larger than the outer diameter of the outer flange.

[0009] Preferably, the support platform is formed by splicing two rectangular steel plate structures, and the bottoms of the opposite ends of the two rectangular steel plate structures are respectively provided with longitudinally arranged first connecting plates, the two first connecting plates are fixedly connected by high-strength bolts, and the opposite ends of the two rectangular steel plate structures are respectively provided with semicircular holes, and the two semicircular holes are spliced ​​into a through hole.

[0010] Preferably, the driving mechanism includes a mobile support frame, a horizontal push hydraulic jack, a spring, and a linear slide. A plurality of groups of linear slides are symmetrically arranged on both sides of the upper surface of the support platform. The mobile support frame is slidably connected to the linear slide by rollers. The top of the mobile support frame is detachably and fixedly connected to a mobile platform. The outer end of the mobile support frame is connected to the outer end edge of the support platform by a number of evenly distributed springs. A horizontal push hydraulic jack is also arranged between the middle of the outer end edge of the support platform and the middle of the outer end edge of the mobile support frame. Driven by the two horizontal push hydraulic jacks, the two mobile platforms are docked, and driven by the springs, the two mobile platforms are reset.

[0011] Preferably, the mobile support frame includes a frame body, multiple groups of rollers arranged on the frame body, support columns, each group of rollers corresponds to a linear slide groove, the support columns are evenly welded to the top of the frame body and are detachably fixedly connected to the lower end of the mobile platform, a push block is provided at one end of the frame body, and the telescopic end of the horizontal push hydraulic jack is connected to the push block.

[0012] Preferably, the support mechanism comprises a horizontal support rod welded to one end of the support platform away from the semicircular arc hole, the two ends of the horizontal support rod are respectively connected to diagonal support rods, and the two ends of the diagonal support rod are respectively connected to the horizontal support rod and the outer wall of the movable sleeve.

[0013] Preferably, the movable sleeve and the fixed sleeve are respectively formed by butting two semicircular arc-shaped cylinder walls, and a second connecting plate is provided on the outer surface of the cylinder wall at the butt joint. The two relative second connecting plates are locked by a bolt and nut assembly, and an upper annular reinforcing steel plate and a lower annular reinforcing steel plate are respectively provided at the top and bottom ends of the movable sleeve and the fixed sleeve. A cantilever for reinforcing support of the fixed sleeve is also welded on the outer surface of the steel column, and the top of the cantilever is in contact with the bottom end of the fixed sleeve. There are multiple cantilevers, and the multiple cantilevers are evenly distributed around the axis of the steel column.

[0014] Preferably, the jacking mechanism comprises four vertical jacking hydraulic jacks arranged around the axis of the steel column, and two ends of the vertical jacking hydraulic jacks are respectively fixedly connected to the bottom end of the movable sleeve and the top end of the fixed sleeve.

[0015] A method for using a high-altitude butt joint auxiliary device for a steel box beam notch includes the following steps:

[0016] S1: Assemble the fixed sleeve, the movable sleeve, the diagonal brace, the support platform, the movable support frame and the movable platform on the steel column respectively. After the installation of the entire auxiliary device is completed, in the initial state, the lifting mechanism raises the movable platform to a set position higher than the top of the steel column;

[0017] S2: Place the two steel box girders to be connected to the designated position on the upper end of the mobile platform, and two horizontal push hydraulic jacks are operated simultaneously. Through fine adjustment, the matching cuts of the two steel box girders are aligned; while aligning, the spring is stretched;

[0018] S3: After the welding of the notch position, the mobile platform is lowered to a height lower than the top of the steel column under the retraction of the jacking mechanism, and the welded steel box girder sits on the top of the steel column;

[0019] S4: After the mobile platform descends to a certain height, the outer flange is connected to the steel box girder by bolts. During this process, the mobile platform serves as a construction platform for workers. Then, the hydraulic jack is pushed horizontally to release the pressure, and the mobile platform returns to its initial position under the action of the spring.

[0020] S5: Remove the mobile platform, mobile support frame, support platform with horizontal push hydraulic jack and spring, diagonal support, mobile sleeve, fixed sleeve in sequence, and remove the entire auxiliary device from the steel column.

[0021] The invention discloses a high-altitude butt joint auxiliary device for steel box beams and a method for using the device, which has the following beneficial effects:

[0022] The present invention provides a high-altitude butt joint auxiliary device for steel box beam matching cuts and a method for using the device, which replaces the traditional process of using a crane to lift and manually operate the splicing of the ring seam matching cuts, and uses the auxiliary device to move the steel box beam to achieve the splicing of the steel box beam matching cuts, thereby improving the butt joint accuracy and ensuring the quality of the project. The present invention is an assembled structure as a whole, which is convenient for disassembly, transportation and multiple turnover use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 , a front view structural schematic diagram of the present invention;

[0024] Figure 2 , a side view schematic diagram of the structure of the present invention;

[0025] Figure 3 , a schematic diagram of the top view of the structure of the present invention;

[0026] Figure 4 , a schematic diagram of the top view of the structure of the present invention after removing the mobile platform;

[0027] Figure 5 , a schematic diagram of the top view of the support platform of the present invention;

[0028] Figure 6 , a schematic diagram of a mobile support frame of the present invention;

[0029] Figure 7 , a schematic diagram of the movable sleeve of the present invention;

[0030] Figure 8 , a schematic diagram of a fixed sleeve of the present invention;

[0031] Fig. 9 , a schematic cross-sectional structural diagram of the mobile platform of the present invention.

[0032] In the figure: 1-spring, 2-horizontal push hydraulic jack, 3-driving mechanism, 4-movable platform, 5-support platform, 6-support mechanism, 7-movable sleeve, 8-lifting mechanism, 9-fixed sleeve, 10-steel column, 11-steel box beam; 3-1: roller, 3-2: frame longitudinal rod, 3-3: support column, 3-4: frame cross rod, 3-5, hook for connecting spring; 3-6: push block, 4-1: guardrail, 4-2: ball seat, 4-3: steel ball, 5-1: linear slide, 6-1: horizontal support rod, 6-2: movable connection, 6-3: diagonal support rod, 7-1: second bolt and nut assembly, 7-2: second upper annular reinforcement steel plate, 7-3: second lower annular reinforcement steel plate, 9-1: first bolt and nut assembly, 9-2: first upper annular reinforcement steel plate, 9-3: first lower annular reinforcement steel plate. DETAILED DESCRIPTION

[0033] The following describes in detail the implementation mode of the present invention in a step-by-step manner. The description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0035] Example 1

[0036] A high-altitude butt joint auxiliary device for steel box beams with cutouts, such as Figure 1-8 As shown, it includes a steel column 10, a fixed sleeve 9, a movable sleeve 7, a support platform 5, a mobile platform 4, and a driving mechanism 3. The upper part of the steel column 10 is fixedly sleeved with a fixed sleeve 9, and the movable sleeve 7 is slidably sleeved on the steel column 10 above the fixed sleeve 9. Both sides of the movable sleeve 7 are connected with a spliced ​​support platform 5 through a supporting mechanism 6. The top of the support platform 5 is relatively provided with a mobile platform 4, and the tops of the two mobile platforms 4 are used to load the steel box girder to be docked. The fixed sleeve 9 is connected to the movable sleeve 7 by a jacking mechanism 8, and the mobile platform 4 is connected to the support platform 5 by a driving mechanism 3. The height of the mobile platform 4 during operation is greater than the height of the steel column 10. After the docking is completed, the mobile platform 4 is lower than the height of the steel column 10 driven by the retraction of the jacking mechanism 8.

[0037] In this embodiment, the mobile platform can be raised to the top of the steel column, and can also be lowered to the bottom of the steel column, so that the mobile platform can not only assist the butt joint of the cut ends of the steel box beam, but also facilitate the dismantling of the entire device after returning to the bottom of the steel column. The device of the present invention adopts an assembled structure as a whole, which is convenient for disassembly, transportation and repeated turnover.

[0038] Example 2

[0039] like Figure 1 , 2 As shown in FIG. 9 , a plurality of ball seats 4 - 2 are evenly embedded on the top of the mobile platform 4 , and steel balls 4 - 3 are rollingly connected inside the ball seats 4 - 2 . Guardrails 4 - 1 are also provided on the left and right ends of the upper surface of the mobile platform 4 .

[0040] Since there may be a certain degree of error when docking the cuts, by setting the ball seat and the steel ball, it is easy to move the steel box beam 11 when there is an error, so that the cuts are accurately aligned and the docking accuracy is guaranteed. This method is different from the steel box beam suspended by wire ropes manually pulled, which belongs to the fine adjustment of the cut position and the difficulty is greatly reduced.

[0041] Example 3

[0042] like Figure 3As shown, the top of the steel column 10 is provided with an outer flange, and is fixedly connected to the spliced ​​steel box girder 11 by bolts. A through hole is provided in the middle of the support platform 5. The inner diameter of the through hole matches the outer diameter of the steel column and is smaller than the outer diameter of the outer flange, that is, the support platform 5 is limited by the outer flange and cannot be higher than the top of the steel column. At the same time, the through hole enables it to move up and down along the steel column, which not only ensures safety but also realizes the flexibility of movement; semicircular holes are provided at the opposite ends of the two mobile platforms 4, and the inner diameter of the semicircular holes is larger than the outer diameter of the outer flange, that is: even when the steel box girder is butt-jointed, the two semicircular holes are butt-jointed into one circular hole, and the outer flange can still be passed through at this time, thereby driving the steel box girder to sit on the top of the steel column.

[0043] like Figure 3 , 4 As shown in Figure 5, the support platform 5 is formed by splicing two rectangular steel plate structures. The bottoms of the opposite ends of the two rectangular steel plate structures are respectively provided with longitudinally arranged first connecting plates (not shown in the figure, refer to the second connecting plate). The two first connecting plates are fixedly connected by high-strength bolts. The opposite ends of the two rectangular steel plate structures are respectively provided with semicircular arc holes, and the two semicircular arc holes are spliced ​​into a through hole. Such a design is easy to disassemble.

[0044] Example 4

[0045] like Figure 1 , 4 As shown in Figure 6, the driving mechanism 3 includes a mobile support frame, a horizontal push hydraulic jack 2, a spring 1, and a linear slide 5-1. A plurality of groups of linear slides 5-1 are symmetrically arranged on both sides of the upper surface of the support platform 5 to control the moving trajectory of the mobile platform 4. The mobile support frame is slidably connected to the linear slide 5-1 through the roller 3-1. The top of the mobile support frame is detachably and fixedly connected with the mobile platform 4. The outer end of the mobile support frame is connected to the outer end edge of the support platform 5 through a number of evenly distributed springs 1, which play a role in resetting the mobile platform. A horizontal push hydraulic jack 2 is also arranged between the middle of the outer end edge of the support platform 5 and the middle of the outer end edge of the mobile support frame. Driven by the two horizontal push hydraulic jacks 2, the two mobile platforms 4 are docked, and driven by the springs, the two mobile platforms 4 are reset.

[0046] like Figure 6 As shown, the mobile support frame includes a frame body (which can be welded by a frame longitudinal rod 3-2 and a frame cross rod 3-4), a plurality of groups of rollers 3-1 and support columns 3-3 arranged on the frame body, each group of rollers 3-1 corresponds to a linear slide groove 5-1, the support columns 3-3 are uniformly welded to the top of the frame body and are detachably fixedly connected to the lower end of the mobile platform 4, a push block 3-6 is provided at one end of the frame body, and the telescopic end of the horizontal push hydraulic jack 2 is connected to the push block 3-6.

[0047] In this embodiment, when the mobile platform is driven to move, the horizontal push hydraulic jack is started, and the mobile platform is driven to dock through the mobile support frame. After the horizontal push hydraulic jack is depressurized, the spring is used to reset the mobile platform.

[0048] Example 5

[0049] like Figure 1 , 2 As shown, the support mechanism 6 includes a horizontal support rod 6-1 welded to one end of the support platform 5 away from the semicircular arc hole, and the two ends of the horizontal support rod 6-1 are respectively connected to the diagonal support rod 6-3, and the two ends of the diagonal support rod 6-3 are respectively connected to the horizontal support rod 6-1 and the outer wall of the movable sleeve 7.

[0050] Example 6

[0051] like Figure 1 , 2 As shown in , 7 and 8, the movable sleeve 7 and the fixed sleeve 9 are respectively formed by butting two semicircular arc-shaped cylinder walls, and a second connecting plate (not marked in the figure) is provided on the outer surface of the cylinder wall at the butt joint, and the two opposite second connecting plates are locked by a bolt and nut assembly (7-1 / 9-1), and an upper annular reinforcing steel plate (7-2 / 9-2) and a lower annular reinforcing steel plate (7-3 / 9-3) are respectively provided at the top and bottom ends of the movable sleeve 7 and the fixed sleeve 9. A cantilever (a commonly used structure, not shown in the figure) for reinforcing and supporting the fixed sleeve 9 is also welded on the outer surface of the steel column 10, and the top of the cantilever is in contact with the bottom end of the fixed sleeve 9. There are multiple cantilevers, and the multiple cantilevers are evenly distributed around the axis of the steel column 10.

[0052] like Figure 8 As shown, the lifting mechanism 8 includes four vertical lifting hydraulic jacks arranged around the axis of the steel column 10, and the two ends of the vertical lifting hydraulic jacks are fixedly connected to the bottom end of the movable sleeve 7 and the top end of the fixed sleeve 9 respectively.

[0053] Example 7

[0054] Based on the above embodiments, this embodiment discloses a method for using a steel box girder high-altitude butt joint auxiliary device, such as Figure 1-9 As shown, the following steps are included:

[0055] S1: Assemble the fixed sleeve 7, the movable sleeve 9, the diagonal brace 6-3, the support platform 5, the movable support frame, and the movable platform 4 on the steel column respectively. After the installation of the entire auxiliary device is completed, in the initial state, the lifting mechanism 8 raises the movable platform 4 to a set position higher than the top of the steel column 10;

[0056] S2: Place the two steel box beams 11 to be connected to the designated position on the upper end of the mobile platform 4, and the two horizontal push hydraulic jacks are operated simultaneously to align the matching cuts of the two steel box beams through fine adjustment; while aligning, the spring 1 is stretched;

[0057] S3: After the welding of the notch position, the mobile platform 4 is lowered to a height lower than the top of the steel column 10 under the retraction of the jacking mechanism 8, and the welded steel box beam 11 sits on the top of the steel column 10;

[0058] S4: After the mobile platform 4 is lowered to a certain height, the outer flange is connected to the steel box beam 11 by bolts. During this process, the mobile platform serves as a construction platform for workers. Then, the hydraulic jack 2 is pushed horizontally to release the pressure. Under the action of the spring 1, the mobile platform 4 returns to the initial position.

[0059] S5: sequentially dismantle the mobile platform 4, the mobile support frame, the support platform 5 with the horizontal push hydraulic jack 2 and the spring 1, the diagonal brace 6-3, the mobile sleeve 7, and the fixed sleeve 9, and dismantle the entire auxiliary device from the steel column.

Claims

1. A high-altitude butt joint auxiliary device for steel box beams with cutouts, characterized by: It includes a steel column, a fixed sleeve, a movable sleeve, a support platform, a mobile platform, and a driving mechanism. The upper part of the steel column is fixedly sleeved with a fixed sleeve, and the steel column above the fixed sleeve is slidably sleeved with a movable sleeve. Both sides of the movable sleeve are connected with spliced ​​support platforms through a supporting mechanism. The top of the support platform is relatively provided with a movable platform, and the tops of the two movable platforms are used to load the steel box girder to be docked. The fixed sleeve is connected to the movable sleeve by a jacking mechanism, and the movable platform is connected to the support platform by a driving mechanism. The height of the movable platform during operation is greater than the height of the steel column. After the docking is completed, the movable platform is lower than the height of the steel column due to the retraction of the jacking mechanism.

2. A steel box girder high-altitude butt joint auxiliary device as claimed in claim 1, characterized in that: A plurality of ball seats are evenly embedded on the top of the mobile platform, steel balls are rotatably connected in the ball seats, and guardrails are also arranged on the left and right ends of the upper surface of the mobile platform.

3. A steel box girder high-altitude butt joint auxiliary device as claimed in claim 2, characterized in that: An outer flange is provided at the top of the steel column and is fixedly connected to the spliced ​​steel box girder by bolts. A through hole is provided in the middle of the support platform. The inner diameter of the through hole matches the outer diameter of the steel column and is smaller than the outer diameter of the outer flange. Semicircular holes are provided at the opposite ends of the two mobile platforms. The inner diameter of the semicircular holes is larger than the outer diameter of the outer flange.

4. A steel box girder high-altitude butt joint auxiliary device as claimed in claim 3, characterized in that: The support platform is formed by splicing two rectangular steel plate structures. The bottoms of the opposite ends of the two rectangular steel plate structures are respectively provided with longitudinally arranged first connecting plates. The two first connecting plates are fixedly connected by high-strength bolts. The opposite ends of the two rectangular steel plate structures are respectively provided with semicircular holes, and the two semicircular holes are spliced ​​into a through hole.

5. A steel box girder high-altitude butt joint auxiliary device as claimed in claim 4, characterized in that: The driving mechanism includes a mobile support frame, a horizontal push hydraulic jack, a spring, and a linear slide. A plurality of groups of linear slides are symmetrically arranged on both sides of the upper surface of the support platform. The mobile support frame is slidably connected to the linear slide by rollers. The top of the mobile support frame is detachably and fixedly connected to a mobile platform. The outer end of the mobile support frame is connected to the outer end edge of the support platform by a number of evenly distributed springs. A horizontal push hydraulic jack is also arranged between the middle of the outer end edge of the support platform and the middle of the outer end edge of the mobile support frame. Driven by the two horizontal push hydraulic jacks, the two mobile platforms are docked, and driven by the springs, the two mobile platforms are reset.

6. A steel box girder high-altitude butt joint auxiliary device as claimed in claim 5, characterized in that: The mobile support frame includes a frame body, multiple groups of rollers arranged on the frame body, and support columns. Each group of rollers corresponds to a linear slide groove. The support columns are evenly welded on the top of the frame body and are detachably fixedly connected to the lower end of the mobile platform. A push block is provided at one end of the frame body, and the telescopic end of the horizontal push hydraulic jack is connected to the push block.

7. A steel box girder high-altitude butt joint auxiliary device as claimed in claim 6, characterized in that: The support mechanism comprises a horizontal support rod welded to one end of the support platform away from the semicircular hole, the two ends of the horizontal support rod are respectively connected to diagonal support rods, and the two ends of the diagonal support rod are respectively connected to the horizontal support rod and the outer wall of the movable sleeve.

8. A steel box girder high altitude butt joint auxiliary device as claimed in claim 7, characterized in that: The movable sleeve and the fixed sleeve are respectively formed by butting two semicircular arc-shaped cylinder walls, and a second connecting plate is provided on the outer surface of the cylinder wall at the butt joint. The two relative second connecting plates are locked by a bolt and nut assembly. An upper annular reinforcing steel plate and a lower annular reinforcing steel plate are respectively provided at the top and bottom ends of the movable sleeve and the fixed sleeve. A cantilever for reinforcing support of the fixed sleeve is also welded on the outer surface of the steel column. The top of the cantilever is in contact with the bottom end of the fixed sleeve. There are multiple cantilevers, and the multiple cantilevers are evenly distributed around the axis of the steel column.

9. A steel box girder high altitude butt joint auxiliary device as claimed in claim 8, characterized in that: The jacking mechanism comprises four vertical jacking hydraulic jacks arranged around the axis of the steel column, and the two ends of the vertical jacking hydraulic jacks are respectively fixedly connected to the bottom end of the movable sleeve and the top end of the fixed sleeve.

10. The method for using the high-altitude butt joint auxiliary device for steel box beam notching as claimed in claim 9, characterized in that: The following steps are involved: S1: Assemble the fixed sleeve, the movable sleeve, the diagonal brace, the support platform, the movable support frame and the movable platform on the steel column respectively. After the installation of the entire auxiliary device is completed, in the initial state, the lifting mechanism raises the movable platform to a set position higher than the top of the steel column; S2: Place the two steel box girders to be connected to the designated position on the upper end of the mobile platform, and two horizontal push hydraulic jacks are operated simultaneously. Through fine adjustment, the matching cuts of the two steel box girders are aligned; while aligning, the spring is stretched; S3: After the welding of the notch position, the mobile platform is lowered to a height lower than the top of the steel column under the retraction of the jacking mechanism, and the welded steel box girder sits on the top of the steel column; S4: After the mobile platform descends to a certain height, the outer flange is connected to the steel box girder by bolts. During this process, the mobile platform serves as a construction platform for workers. Then, the hydraulic jack is pushed horizontally to release the pressure, and the mobile platform returns to its initial position under the action of the spring. S5: Remove the mobile platform, mobile support frame, support platform with horizontal push hydraulic jack and spring, diagonal support, mobile sleeve, fixed sleeve in sequence, and remove the entire auxiliary device from the steel column.

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