A bridge steel main girder sliding closure device and its construction method

Abstract

This invention provides a sliding closure device for a bridge steel main girder and its construction method, belonging to the field of bridge construction technology. The structure includes a fixed section steel box girder, a closure section steel box girder, and a sliding mechanism. The fixed section steel box girder and the closure section steel box girder are spliced ​​together to form the main steel girder. The sliding mechanism is symmetrically arranged on both sides of the fixed section steel box girder and the closure section steel box girder. The sliding mechanism includes a fixed plate, a jacking plate, connecting rods, a sliding plate, and a hydraulic cylinder. The fixed plate is fixedly connected to the fixed section steel box girder. The jacking plate is located on the outside of the closure section steel box girder. Two connecting rods are provided. The sliding plate is fixedly connected to the closure section steel box girder. The hydraulic cylinder is located between the jacking plate and the sliding plate. This structure drives the two steel box girders to close and connect through the sliding mechanism, facilitating the adjustment of the position gap of the closure section steel box girder. The structure is reasonable, simple to process, manufacture, and install, saves manpower, has high adjustment accuracy, and improves construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and specifically relates to a bridge steel main beam sliding and closing device and its construction method. Background Technology

[0002] With the rapid development of China's economy and technology, the demand for steel girder bridges is increasing. The erection of steel main girders generally employs a piecemeal assembly method, resulting in a long construction period. Furthermore, the welding quality of steel main girders is difficult to guarantee in winter. Therefore, to improve the quality of steel main girder erection and shorten the construction period, construction workers typically assemble steel box girders on scaffolding on the shore as much as possible, achieving factory-like operations. This avoids the adverse effects of rainy seasons and winter on the welding and tightening quality of high-strength bolts, thus better ensuring quality. However, assembling and towing the entire steel main girder as a whole is very difficult due to its significant weight. Currently, there are three commonly used methods for the erection of long-span continuous steel girder bridges: cantilever assembly with cable-stayed tower construction, cantilever assembly with temporary pier construction, and incremental launching. Among these, incremental launching is the most widely used method. However, when assembling the sliding support of the main steel girder, the position of the closure section is often adjusted by using screw rods in conjunction with temporary manual adjustment devices. The screw rods are not strong enough to move the steel box girder, and manual operation is time-consuming and labor-intensive. Furthermore, the assembly accuracy cannot achieve precise positioning, resulting in low construction efficiency and affecting the construction progress. Summary of the Invention

[0003] This invention provides a bridge steel main girder sliding and closing device and its construction method. The sliding mechanism drives the steel box girders on both sides to close and connect, which facilitates the adjustment of the position gap of the closing section of the steel box girder. The device has a reasonable structure, is simple to process, manufacture and install, saves manpower, has high adjustment accuracy and improves construction efficiency.

[0004] In view of the above problems, the technical solution proposed by the present invention is as follows:

[0005] A bridge steel main girder sliding and closing device includes a fixed section steel box girder, a closing section steel box girder, and a sliding mechanism. The fixed section steel box girder and the closing section steel box girder are spliced ​​together to form a steel main girder. Multiple sleeves are symmetrically arranged on one side of the fixed section steel box girder, and guide columns are symmetrically arranged on one side of the closing section steel box girder. The ends of the guide columns are inserted into the sleeves. The sliding mechanism is symmetrically arranged on both sides of the fixed section steel box girder and the closing section steel box girder. The sliding mechanism includes a fixed plate, a jacking plate, connecting rods, a sliding plate, and a hydraulic cylinder. The fixed plate, the jacking plate, and the sliding plate all have an "L"-shaped structure. The fixed plate is fixedly connected to the fixed section steel box girder. The jacking plate is located on the outside of the closing section steel box girder. Two connecting rods are provided. The sliding plate is fixedly connected to the closing section steel box girder and movably arranged between the two connecting rods. The hydraulic cylinder is located between the jacking plate and the sliding plate.

[0006] As a preferred embodiment of the present invention, one end of the sleeve is provided with a first connecting plate, which is welded and fixed to the web of the fixed section steel box girder; one end of the guide column is provided with a second connecting plate, which is welded and fixed to the web of the closing section steel box girder; the other end of the sleeve is provided with a mortise and tenon groove in an annular array; the outer surface of the guide column is provided with a mortise and tenon teeth in an annular array, which are inserted into the interior of the mortise and tenon groove.

[0007] As a preferred embodiment of the present invention, the end of the sleeve is flush with the end of the fixed section steel box girder, and the end of the guide column protrudes from the end of the closing section steel box girder, but the length of the protruding part is less than the depth of the sleeve.

[0008] As a preferred embodiment of the present invention, a first screw is provided on both sides of the fixed section steel box girder, and a first nut is provided on the fixed plate. The end of the first screw passes through the fixed plate and is connected to the first nut.

[0009] As a preferred embodiment of the present invention, a second screw is provided on both sides of the closure section steel box girder, and a second nut is provided on the sliding plate. The end of the second screw passes through the sliding plate and is connected to the second nut.

[0010] As a preferred embodiment of the present invention, the two ends of the connecting rod are fixedly connected to the fixing plate and the pushing plate, respectively. A sliding groove is provided on the side of the connecting rod that is close to each other. The sliding groove has a "T" shape structure and a roller is provided inside the sliding groove. The sliding plate moves synchronously with the roller.

[0011] As a preferred embodiment of the present invention, limit rods are symmetrically arranged on both sides of the sliding plate, and a bushing is provided on the outer side of the limit rod. The bushing is coaxially arranged with the limit rod and rotatably connected. A connecting rod is provided on one side of the bushing, and the other end of the connecting rod is rotatably connected to the roller.

[0012] As a preferred embodiment of the present invention, a first blind groove is provided on one side of the push plate, a second blind groove is provided on one side of the sliding plate, one end of the hydraulic cylinder is embedded in the first blind groove, and the output end of the hydraulic cylinder is embedded in the second blind groove.

[0013] As a preferred embodiment of the present invention, the hydraulic cylinder is connected to a hydraulic controller, and the input ends of the hydraulic cylinder on both sides are connected in parallel.

[0014] On the other hand, a construction method for sliding and closing a bridge steel main girder includes the following steps:

[0015] S1, the steel box girder is hoisted into place, and the closure section of the steel box girder is hoisted and moved to one side of the fixed section of the steel box girder so that the side with the guide column corresponds to the side of the sleeve;

[0016] S2, Sliding mechanism installation: Slide the fixing plate onto the first screw, and use the first nut to fix the fixing plate to the fixed section steel box girder in sequence, and make the push plate at the other end of the connecting rod on the closing section steel box girder. Then slide the sliding plate onto the second screw, and lock it with the second nut in sequence. Then connect the hydraulic cylinders on both sides in parallel to the hydraulic controller.

[0017] S3, the steel box girder is pre-aligned, and the steel box moving mechanism drives the closing section steel box girder to continue to slowly approach the fixed section steel box girder. Workers adjust the height and horizontal position of the closing section steel box girder by observing the corresponding positions of the guide column and the sleeve until the tenon teeth on the guide column correspond one by one with the tenon grooves on the sleeve.

[0018] S4, the steel box girder slides and closes, the hydraulic controller is activated, the output end of the hydraulic cylinder pushes out and embeds into the second blind groove on the sliding plate, the output end of the hydraulic cylinder applies pressure to the sliding plate, and the sliding plate drives the closing section of the steel box girder and the fixed section of the steel box girder to gradually approach each other until the gap between the two meets the construction requirements;

[0019] S5, the sliding mechanism is dismantled, and the closure section steel box girder is temporarily welded and fixed to the fixed section steel box girder until the steel box girder is spliced. The steel box girders are then welded from both sides of the bridge toward the middle in sequence to form the main steel beam structure. Finally, the sliding mechanism is dismantled in sequence.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The main steel beam is composed of steel box girder segments spliced ​​together. The prefabricated standard sections are used to achieve mass production and factory production, reduce the impact of the environment on the steel box girder manufacturing, and ensure the quality of welding and manufacturing.

[0022] (2) The position gap between the closing section and the fixed section is adjusted by the sliding mechanism. The sliding mechanism outputs high pressure power from the hydraulic cylinder to quickly and smoothly move the closing section towards the fixed section, improving the efficiency and accuracy of position gap adjustment, effectively ensuring the quality of steel main beam closure and splicing, adopting mechanized operation, reducing the labor intensity of workers, and the sliding mechanism is simple and convenient to disassemble and assemble, with simple operation steps, thus improving construction efficiency.

[0023] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of a bridge steel main beam sliding and closing device disclosed in this invention;

[0025] Figure 2 This is a schematic diagram and a partially enlarged view of the fixed-section steel box girder disclosed in this invention;

[0026] Figure 3 This is a schematic diagram and a partially enlarged view of the closure section steel box girder disclosed in this invention;

[0027] Figure 4 yes Figure 1 A magnified view of point A in the middle;

[0028] Figure 5 This is a schematic diagram of the sliding mechanism disclosed in this invention;

[0029] Figure 6 This is a top-section structural schematic diagram of the sliding mechanism disclosed in this invention;

[0030] Figure 7 This is a schematic flowchart of a construction method for sliding and closing a bridge steel main beam, as disclosed in this invention.

[0031] Explanation of reference numerals in the attached drawings: 100, fixed section steel box girder; 101, sleeve; 102, tenon and mortise groove; 103, first connecting plate; 104, first screw; 200, closing section steel box girder; 201, guide column; 202, tenon and mortise teeth; 203, second connecting plate; 204, second screw; 300, sliding mechanism; 301, fixed plate; 3011, first nut; 302, jacking plate; 3021, first blind groove; 303, connecting rod; 3031, sliding groove; 304, sliding plate; 3041, second nut; 3042, limiting rod; 3043, bushing; 3044, connecting rod; 3045, roller; 3046, second blind groove; 305, hydraulic cylinder. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] Example 1

[0038] See attached document Figure 1-6 As shown, this invention provides a technical solution: a bridge steel main girder sliding and closing device, comprising a fixed section steel box girder 100, a closing section steel box girder 200, and a sliding mechanism 300. The fixed section steel box girder 100 and the closing section steel box girder 200 are spliced ​​together to form a steel main girder. The steel main girder is divided into several segments of steel box girder after stress analysis, and then assembled on-site. The steel box girder is mass-produced and factory-produced, reducing the impact of the environment on the welding quality of the steel box girder and ensuring the quality of the steel box girder. For strength and safety, multiple sleeves 101 are symmetrically arranged on one side of the fixed section steel box girder 100, and guide columns 201 are symmetrically arranged on one side of the closing section steel box girder 200. The ends of the guide columns 201 are inserted into the sleeves 101. The cooperation between the sleeves 101 and the guide columns 201 facilitates the docking of the fixed section steel box girder 100 and the closing section steel box girder 200. The sliding mechanism 300 is symmetrically arranged on both sides of the fixed section steel box girder 100 and the closing section steel box girder 200. The sliding mechanism 300 drives the two sides of the closing section steel box girder 200 to move synchronously towards the fixed section steel box girder 100 to ensure stability and reliability. The sliding mechanism 300 includes a fixed plate 301, a jacking plate 302, a connecting rod 303, a sliding plate 304, and a hydraulic cylinder 305. The fixed plate 301, the jacking plate 302, and the sliding plate 304 are all L-shaped structures. The fixed plate 301 is fixedly connected to the fixed section steel box girder 100, and the jacking plate 302 is located on the outer side of the closing section steel box girder 200. The jacking plate 302 is used to withstand the reverse force during the sliding process. There are two connecting rods 303. The sliding plate 304 is fixedly connected to the closure section steel box girder 200 and is movably set between the two connecting rods 303. The hydraulic cylinder 305 is set between the jacking plate 302 and the sliding plate 304. The hydraulic cylinder 305 acts on the sliding plate 304, thereby realizing the adjustment of the distance between the closure section steel box girder 200 and the fixed section steel box girder 100, and completing the splicing and forming of the steel main beam.

[0039] In an embodiment of the present invention, a first connecting plate 103 is provided at one end of the sleeve 101. The first connecting plate 103 is welded and fixed to the web of the fixed section steel box girder 100. A second connecting plate 203 is provided at one end of the guide column 201. The second connecting plate 203 is welded and fixed to the web of the closure section steel box girder 200. The first connecting plate 103 and the second connecting plate 203 respectively increase the welding area between the sleeve 101 and the guide column 201 and the web, making the connection more stable and reliable. The other end of the sleeve 101 is provided with a mortise and tenon groove 102 in an annular array. The outer surface of the guide column 201 is provided with a mortise and tenon teeth 202 in an annular array. The mortise and tenon teeth 202 are inserted into the inside of the mortise and tenon groove 102. The cooperation between the mortise and tenon teeth 202 and the mortise and tenon groove 102 facilitates the positioning of the guide column 201 and the sleeve 101, making the docking of the two sections of steel box girder more precise.

[0040] In an embodiment of the present invention, the end of the sleeve 101 is flush with the end of the fixed section steel box girder 100, and the end of the guide column 201 protrudes from the end of the closing section steel box girder 200, but the length of the protruding part is less than the depth of the sleeve 101, so that the guide column 201 is pre-inserted into the sleeve 101 when the steel box girder is connected to complete the fit, which is convenient for workers to observe.

[0041] In an embodiment of the present invention, a first screw 104 is provided on both sides of the fixed section steel box girder 100, and a first nut 3011 is provided on the fixing plate 301. The end of the first screw 104 passes through the fixing plate 301 and is connected to the first nut 3011. The first nut 3011 connects the fixing plate 301 to the fixed section steel box girder 100 through the threaded engagement with the first screw 104. The first screws 104 are arranged in an array to ensure the firmness of the fixing plate 301.

[0042] In an embodiment of the present invention, a second screw 204 is provided on both sides of the closure section steel box girder 200, and a second nut is provided on the sliding plate 304. The end of the second screw 204 passes through the sliding plate 304 and is connected to the second nut 3041. The threaded engagement between the second nut 3041 and the second screw 204 also connects and fixes the sliding plate 304 to the closure section steel box girder 200, ensuring that the sliding plate 304 drives the closure section steel box girder 200 to move synchronously.

[0043] In an embodiment of the present invention, the two ends of the connecting rod 303 are fixedly connected to the fixing plate 301 and the push plate 302 respectively. The connecting rod 303, the fixing plate 301 and the push plate 302 form a square structure. A sliding groove 3031 is provided on the side of the connecting rod 303 that is close to each other. The sliding groove 3031 has a "T" shape structure. A roller 3045 is provided inside the sliding groove 3031. The sliding plate 304 and the roller 3045 move synchronously. The sliding plate 304 moves along the long side of the square structure. The roller 3045 is in clearance fit with the sliding groove 3031. The roller 3045 provides guidance for the movement of the sliding plate 304. In addition, when the sliding plates 304 on both sides move asynchronously, the cooperation between the roller 3045 and the sliding groove 3031 prevents the sliding plate 304 from deviating and getting stuck, ensuring the stability of the movement guidance.

[0044] In an embodiment of the present invention, limit rods 3042 are symmetrically arranged on both sides of the sliding plate 304. A bushing 3043 is provided on the outer side of the limit rod 3042. The bushing 3043 is coaxially arranged with the limit rod 3042 and rotatably connected. A connecting rod 3044 is provided on one side of the bushing 3043. The other end of the connecting rod 3044 is rotatably connected to the roller 3045. The bushing 3043 can rotate around the limit rod 3042 at a certain angle, so that the roller 3045 connected to the connecting rod 3044 can be appropriately deflected at a certain angle to prevent the sliding plate 304 from getting stuck.

[0045] In an embodiment of the present invention, a first blind groove 3021 is provided on one side of the push plate 302, and a second blind groove 3046 is provided on one side of the sliding plate 304. One end of the hydraulic cylinder 305 is embedded in the first blind groove 3021, and the output end of the hydraulic cylinder 305 is embedded in the second blind groove 3046. The two blind grooves make the hydraulic cylinder 305 more stable and reliable, and also ensure that the output force of the hydraulic cylinder 305 acts on the sliding plate 304.

[0046] In an embodiment of the present invention, the hydraulic cylinder 305 is connected to a hydraulic controller, and the input ends of the hydraulic cylinders 305 on both sides are connected in parallel. The hydraulic controller operates the hydraulic cylinders 305 to extend or retract, and the parallel connection keeps the hydraulic cylinders 305 on both sides under equal pressure, so that the sliding plates 304 on both sides can synchronously drive the closing section steel box girder 200 to move.

[0047] Example 2

[0048] See attached document Figure 7 As shown in the figure, another construction method for sliding and closing a bridge steel main girder, provided by an embodiment of the present invention, includes the following steps:

[0049] S1, the steel box girder is hoisted into place, and the closure section steel box girder 200 is hoisted and moved to one side of the fixed section steel box girder 100, so that the side with the guide column 201 corresponds to the side of the sleeve 101.

[0050] S2, Sliding mechanism installation: The fixing plate 301 is put onto the first screw 104, and the fixing plate 301 is fixedly connected to the fixed section steel box girder 100 with the first nut 3011 in sequence. The push plate 302 at the other end of the connecting rod 303 is located on the closing section steel box girder 200. Then the sliding plate 304 is put onto the second screw 204 and locked with the second nut 3041 in sequence. Then the hydraulic cylinders 305 on both sides are connected in parallel to the hydraulic controller.

[0051] S3, the steel box girder is pre-aligned, and the steel box moving mechanism drives the closing section steel box girder 200 to continue to slowly approach the fixed section steel box girder 100. The workers observe the corresponding positions of the guide column 201 and the sleeve 101 and adjust the height and horizontal position of the closing section steel box girder 200 until the tenon teeth 202 on the guide column 201 correspond one-to-one with the tenon grooves 102 on the sleeve 101.

[0052] S4, the steel box girder slides and closes, the hydraulic controller is activated, the output end of the hydraulic cylinder 305 pushes out and embeds into the second blind groove 3046 on the sliding plate 304, the output end of the hydraulic cylinder 305 applies pressure to the sliding plate 304, and the sliding plate 304 drives the closing section steel box girder 200 and the fixed section steel box girder 100 to gradually approach each other until the gap between the two meets the construction requirements;

[0053] S5, the sliding mechanism is removed, and the closure section steel box girder 200 is temporarily welded and fixed to the fixed section steel box girder 100 until the steel box girder is spliced. The steel box girders are then welded from both sides of the bridge toward the middle in sequence to form the main steel beam structure. Finally, the sliding mechanism 300 is removed in sequence.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A bridge steel main girder sliding and closing device, characterized in that, The structure includes a fixed steel box girder (100), a closure steel box girder (200), and a sliding mechanism (300). The fixed steel box girder (100) and the closure steel box girder (200) are spliced ​​together to form a main steel beam. Multiple sleeves (101) are symmetrically arranged on one side of the fixed steel box girder (100), and guide columns (201) are symmetrically arranged on one side of the closure steel box girder (200). The ends of the guide columns (201) are inserted into the sleeves (101). The sliding mechanism (300) is symmetrically arranged on the fixed steel box girder (100). The sliding mechanism (300) includes a fixed plate (301), a jacking plate (302), a connecting rod (303), a sliding plate (304), and a hydraulic cylinder (305) on both sides of the closure section steel box girder (200). The fixed plate (301), the jacking plate (302), and the sliding plate (304) are all L-shaped. The fixed plate (301) is fixedly connected to the fixed section steel box girder (100). The jacking plate (302) is located on the outside of the closure section steel box girder (200). The connecting rod (303) is located on the outside of the closure section steel box girder (200). Two sliding plates (304) are provided. The sliding plate (304) is fixedly connected to the closure section steel box girder (200) and movably disposed between the two connecting rods (303). The hydraulic cylinder (305) is disposed between the push plate (302) and the sliding plate (304). The two ends of the connecting rod (303) are fixedly connected to the fixed plate (301) and the push plate (302) respectively. Each connecting rod (303) has a sliding groove (3031) on the side closest to each other. The sliding groove (3031) has a "T" shaped structure. (3031) is equipped with a roller (3045) inside, and the sliding plate (304) moves synchronously with the roller (3045); the sliding plate (304) is symmetrically equipped with limit rods (3042) on both sides, and a bushing (3043) is provided on the outer side of the limit rod (3042). The bushing (3043) is coaxially arranged with the limit rod (3042) and rotatably connected. A connecting rod (3044) is provided on one side of the bushing (3043), and the other end of the connecting rod (3044) is rotatably connected to the roller (3045).

2. The bridge steel main girder sliding and closing device according to claim 1, characterized in that, One end of the sleeve (101) is provided with a first connecting plate (103), which is welded and fixed to the web of the fixed section steel box girder (100). One end of the guide column (201) is provided with a second connecting plate (203), which is welded and fixed to the web of the closing section steel box girder (200). The other end of the sleeve (101) is provided with a mortise and tenon groove (102) in an annular array. The outer surface of the guide column (201) is provided with a mortise and tenon teeth (202) in an annular array, which are inserted into the mortise and tenon groove (102).

3. The bridge steel main girder sliding and closing device according to claim 1, characterized in that, The end of the sleeve (101) is flush with the end of the fixed section steel box girder (100), and the end of the guide column (201) protrudes from the end of the closing section steel box girder (200), but the length of the protruding part is less than the depth of the sleeve (101).

4. The bridge steel main girder sliding and closing device according to claim 1, characterized in that, Both sides of the fixed section steel box girder (100) are provided with first screws (104), and the fixed plate (301) is provided with first nuts (3011). The end of the first screw (104) passes through the fixed plate (301) and is connected to the first nut (3011).

5. The bridge steel main girder sliding and closing device according to claim 1, characterized in that, The steel box girder (200) of the closing section is provided with a second screw (204) on both sides, and a second nut is provided on the sliding plate (304). The end of the second screw (204) passes through the sliding plate (304) and is connected to the second nut (3041).

6. The bridge steel main girder sliding and closing device according to claim 1, characterized in that, The push plate (302) has a first blind groove (3021) on one side, and the sliding plate (304) has a second blind groove (3046) on one side. One end of the hydraulic cylinder (305) is embedded in the first blind groove (3021), and the output end of the hydraulic cylinder (305) is embedded in the second blind groove (3046).

7. The bridge steel main girder sliding and closing device according to claim 1, characterized in that, The hydraulic cylinder (305) is connected to a hydraulic controller, and the input ends of the hydraulic cylinder (305) on both sides are connected in parallel.

8. A construction method for sliding and closing a bridge steel main girder, applied to the bridge steel main girder sliding and closing device according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1, the steel box girder is hoisted into place, and the closure section steel box girder (200) is hoisted and moved to one side of the fixed section steel box girder (100), so that the side with the guide column (201) corresponds to the side of the sleeve (101); S2, Sliding mechanism installation: The fixing plate (301) is put onto the first screw (104), and the fixing plate (301) is fixedly connected to the fixed section steel box girder (100) in sequence with the first nut (3011), and the push plate (302) at the other end of the connecting rod (303) is located on the closing section steel box girder (200). Then the sliding plate (304) is put onto the second screw (204), and locked in sequence with the second nut (3041). Then the hydraulic cylinders (305) on both sides are connected in parallel to the hydraulic controller. S3, the steel box girder is pre-aligned, and the closing section steel box girder (200) is driven by the steel box moving mechanism to slowly approach the fixed section steel box girder (100). The workers observe the corresponding positions of the guide column (201) and the sleeve (101) and adjust the height and horizontal position of the closing section steel box girder (200) until the tenon teeth (202) on the guide column (201) correspond one-to-one with the tenon grooves (102) on the sleeve (101); S4, the steel box girder slides and closes, the hydraulic controller is activated, the output end of the hydraulic cylinder (305) pushes out and embeds into the second blind groove (3046) on the sliding plate (304), the output end of the hydraulic cylinder (305) applies pressure to the sliding plate (304), and the sliding plate (304) drives the closing section steel box girder (200) and the fixed section steel box girder (100) to gradually approach each other until the gap between the two meets the construction requirements; S5, the sliding mechanism is removed, and the closure section steel box girder (200) and the fixed section steel box girder (100) are temporarily welded and fixed until the steel box girder is spliced. The steel box girder is then welded from both sides of the bridge to the middle in sequence to form the steel main beam structure. Finally, the sliding mechanism (300) is removed in sequence.

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