A construction and installation structure for bridge steel box girders and its installation method

Abstract

This invention relates to the field of bridge construction technology, and provides a bridge steel box girder construction and installation structure and method, including a steel box girder and a support frame. The support frame is installed at the bottom end of the steel box girder, and installation blocks are fixed on both sides of the bottom end of the steel box girder. Clamping grooves are formed inside the sides and ends of the bottom end of the steel box girder, and a fixing groove is formed inside the top end of the steel box girder. An installation structure is provided inside the fixing groove, including gear columns, which are installed at both ends inside the fixing groove. By providing this installation structure, to facilitate the installation of the steel box girder, after the installation block is inserted into the fixing groove at the top of the support frame, its own weight will push the moving frame downwards. As the moving frame moves downwards, the cooperation between the moving frame and the gear columns drives two sets of clamping frames to move towards the center position, thereby clamping the installation block through the two sets of clamping plates.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a bridge steel box girder construction and installation structure and its installation method. Background Technology

[0002] Steel box girders are a common structural form for long-span bridges. Also known as steel plate box girders, they are bridge structures composed of a top plate, bottom plate, web, transverse diaphragms, longitudinal diaphragms, and stiffening ribs, all connected by full welding. Named for their box-like shape, steel box girders are a frequently used structural form in bridge engineering, particularly suitable for long-span bridges. Due to their lightweight, high strength, high stability, and good wind and earthquake resistance, steel box girders have become important components in highway, urban rail transit, railway, and airport engineering projects.

[0003] There are still some problems in the installation of bridge steel box girders. Traditionally, large cranes are used to install bridge steel box girders. However, when the box girder is installed on the support frame, workers need to use connectors to install and fix the connection between the bridge steel box girder and the support frame. The traditional connector fixing method is not only cumbersome but also troublesome to install. Therefore, a bridge steel box girder construction and installation structure is needed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a construction and installation structure and method for bridge steel box girders, in order to solve the shortcomings of existing bridge steel box girder construction and installation procedures that are relatively cumbersome and troublesome during installation.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bridge steel box girder construction and installation structure, including a steel box girder and a support frame, wherein the support frame is installed at the bottom end of the steel box girder, and installation blocks are fixed on both sides of the bottom end of the steel box girder. Clamping grooves are opened inside the sides and ends of the bottom end of the steel box girder, and a fixing groove is opened inside the top end of the steel box girder. An installation structure is provided inside the fixing groove.

[0006] The mounting structure includes a gear column, which is installed at both ends inside a fixing groove. Guide blocks are fixed at both ends inside the fixing groove. A clamping frame is installed inside the guide blocks. A clamping plate is fixed to one side of the clamping frame. A guide rod is fixed to the bottom end of the gear column near the inside of the fixing groove. One end of the guide rod is fixed to one end inside the fixing groove. A movable frame is installed on the outside of the gear column. A guide groove is opened inside the bottom end of the movable frame. Fixing blocks are fixed to both sides of the movable frame. A spring is installed at the top of the fixing block. A fixing plate is fixed to the top of the spring. One side of the fixing plate is fixed to one end inside the fixing groove.

[0007] Preferably, connecting blocks are fixed on both sides of the mounting block, rotating grooves are opened on both sides inside the fixing groove, a fixing shaft is fixed inside the rotating groove, a gear disk is installed on the outside of the fixing shaft, a moving groove is opened on both sides inside the fixing groove, and a fixing plate is installed inside the moving groove.

[0008] Preferably, the clamping frame is provided in two sets, and the two sets of clamping frames are symmetrically distributed on both sides of the gear column, and the teeth on one side of the clamping frame mesh with the gear column.

[0009] Preferably, the guide rod slides inside the guide groove, and the clamping frame and the guide rod form a guiding connection.

[0010] Preferably, the springs are provided in two sets, and the springs and the fixing plate form a telescopic structure.

[0011] Preferably, the top end of the fixing plate is inserted into the interior of the clamping groove, and the fixing plate and the clamping groove form an insertion structure.

[0012] Preferably, a reinforcing structure is provided at the connection between the steel box girder and the support frame. The reinforcing structure includes a support block, which is fixed to one side of the support frame. An installation plate is fixed to the top of the support block, and a first inclined frame is fixed to the top of the installation plate. A second inclined frame is fixed to the top of the first inclined frame, and the top of the second inclined frame is fixed to the bottom end of the steel box girder.

[0013] Preferably, the support block is welded together with the mounting plate, the first inclined frame, and the second inclined frame.

[0014] Preferably, the support frame has a positioning structure inside the top two sides and two ends. The positioning structure includes a positioning groove, which is opened inside the top two sides and two ends of the support frame. A positioning block is inserted inside the positioning groove. The top of the positioning block is fixed to the bottom of the steel box girder. An installation hole is opened inside one side of the positioning block, and an installation bolt is inserted inside the installation hole.

[0015] Preferably, a method for constructing and installing a bridge steel box girder includes the following steps, characterized in that:

[0016] S1. When installing the steel box girder, start a large crane to lift the steel box girder. After lifting, move the steel box girder to the top of the support frame. When the steel box girder is moved to the top of the support frame, adjust the position of the steel box girder so that the positioning block at the bottom of the support frame is aligned with the top of the positioning groove. After alignment, lower the steel box girder so that the positioning block is inserted into the inside of the positioning groove. At this time, the cooperation of the positioning block and the positioning groove can position the steel box girder to ensure that the steel box girder will not shift when it is installed at the top of the support frame, thus completing the positioning and installation of the steel box girder.

[0017] S2. When the steel box girder is installed at the top of the support frame, the mounting block at the bottom of the support frame will be installed in the fixing groove at the top of the support frame. When the mounting block is inserted into the fixing groove at the top of the support frame, as the mounting block moves downward, it can move downward through the moving frame at the bottom. When the moving frame moves downward, it moves outside the guide rod through the guide groove, thereby guiding the moving frame and making the moving frame more stable when moving downward.

[0018] S3. When the moving frame moves downward, it will drive the fixed block to move downward. When the fixed block moves downward, it will pull the spring to stretch. When the moving frame moves downward, the teeth on one side of the top of the moving frame will mesh with the gear column, thereby driving the gear column to rotate. When the gear column rotates, because there are teeth on one side of the clamping frame, the gear column will move to one side by engaging with the teeth inside the clamping frame. Through the cooperation between the two sets of clamping frames, after the installation block is inserted into the fixing groove at the top of the steel box girder, the moving frame is just pressed against the bottom of the fixing groove by the installation block. When the moving frame is pressed against the bottom of the fixing groove, the two sets of clamping frames will drive the two sets of clamping plates to press against the sides of the installation block, thereby using the weight of the steel box girder itself to clamp and fix the installation block.

[0019] S4. When the mounting block moves downward, it also drives the connecting block to move downward. When the connecting block moves downward, it drives the gear disk to rotate. When the gear disk rotates, it meshes with the teeth on one side of the fixed plate, which drives the fixed plate to move upward. When the fixed plate moves upward, it moves inside the moving groove. At this time, the use of the moving groove can guide the fixed plate and make the fixed plate more stable when moving. When the mounting block is fully inserted into the fixed groove at the top of the support frame, the top of the fixed plate will move upward and insert into the clamping groove to clamp the steel box girder again, thereby completing the installation and clamping work of the steel box girder.

[0020] S5. After the steel box girder is installed on the top of the support frame, the reinforcing structure is fixed at the connection between the steel box girder and the support frame. After the fixing is completed, the connection between the steel box girder and the support frame can be reinforced by the cooperation of the support block, the first inclined frame and the second inclined frame, thus completing the reinforcement work. After the steel box girder is installed, one end of the mounting bolt is inserted through the inside of one side of the support frame and rotated into the inside of the mounting hole to fix the positioning block, and finally the installation of the steel box girder is completed.

[0021] The present invention provides a construction and installation structure and method for a bridge steel box girder, the advantages of which are:

[0022] With the installation structure in place, to make the installation of the steel box girder more convenient, after the installation block is inserted into the fixed groove at the top of the support frame, it will use its own gravity to squeeze the moving frame downward. When the moving frame moves downward, through the cooperation between the moving frame and the gear column, it drives the two sets of clamping frames to move to the middle position, thereby clamping the installation block through the two sets of clamping plates.

[0023] Furthermore, the installation block can be clamped using the weight of the steel box girder itself, eliminating the need for additional power or force as required by external clamps or equipment. This not only saves energy but also simplifies the operation process, reduces construction costs and complexity. Moreover, the weight of the steel box girder is a continuous and stable force, providing uniform and sustained pressure to the installation block, ensuring its stable fixation during the operation of the steel box girder. This helps enhance the overall stability and reliability of the steel box girder structure. Regardless of the environmental conditions or usage status of the steel box girder, its own weight always exists and plays a role. Even in special circumstances, such as natural disasters like earthquakes or strong winds, the clamping force generated by the weight of the steel box girder can still maintain the position of the installation block to a certain extent, providing some protection for the steel box girder.

[0024] Furthermore, after the mounting block is installed in the top fixing groove of the support frame, the fixing plate can be moved upward by the cooperation between the connecting block and the gear plate, so that the fixing plate is inserted into the inside of the clamping groove to perform secondary limiting clamping on the steel box beam, making it more stable after the support frame is installed.

[0025] By incorporating a reinforced structure, after the steel box girder and support frame are installed, the connection between the steel box girder and support frame can be strengthened through the combined use of support blocks, the first inclined frame, and the second inclined frame. The reinforced structure can distribute the load transmitted from the steel box girder more evenly onto the support frame. Due to the stability of the triangle, stress concentration can be effectively avoided, reducing the occurrence of excessive stress in local areas of the structure, thereby improving the overall load-bearing capacity of the structure and ensuring the safety and stability of the bridge under various loads such as vehicle loads and wind loads, thus completing the reinforcement work. Attached Figure Description

[0026] Figure 1 This is a frontal three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the present invention viewed from below;

[0028] Figure 3 This is a side view partial cross-sectional exploded three-dimensional structural schematic diagram of the present invention;

[0029] Figure 4 This is a schematic diagram of the exploded three-dimensional structure of the present invention, viewed from below in partial cross-section.

[0030] Figure 5 This is a top-view cross-sectional three-dimensional structural schematic diagram of the mounting structure of the present invention;

[0031] Figure 6 This is a three-dimensional structural schematic diagram of the mounting structure of the present invention, viewed from below.

[0032] Figure 7 This is a three-dimensional structural schematic diagram of the installation structure of the present invention, viewed from the side.

[0033] Figure 8 for Figure 7 A magnified three-dimensional structural diagram of a portion of point A in the middle;

[0034] Figure 9 This is a top-view cross-sectional three-dimensional structural diagram of the mobile frame of the present invention;

[0035] Figure 10 This is a side cross-sectional three-dimensional structural schematic diagram of the mobile frame of the present invention;

[0036] Figure 11 This is a three-dimensional structural diagram of the mobile frame of the present invention, viewed from below.

[0037] Figure 12 This is a side view of the three-dimensional structure of the mobile frame of the present invention;

[0038] Figure 13 This is a side cross-sectional three-dimensional structural schematic diagram of the positioning structure of the present invention.

[0039] The following are the annotations in the figure: 1. Steel box girder; 2. Support frame; 3. Reinforcing structure; 301. Support block; 302. Mounting plate; 303. First inclined frame; 304. Second inclined frame; 4. Mounting block; 5. Mounting structure; 501. Fixing plate; 502. Gear disk; 503. Fixing shaft; 504. Moving groove; 505. Moving frame; 506. Clamping frame; 507. Guide block; 508. Gear column; 509. Fixing plate; 5010. Fixing block; 5011. Spring; 5012. Connecting block; 5013. Rotating groove; 5014. Guide rod; 5015. Guide groove; 5016. Clamping plate; 6. Positioning structure; 601. Positioning block; 602. Positioning groove; 603. Mounting hole; 604. Mounting bolt; 7. Clamping groove; 8. Fixing groove. Detailed Implementation

[0040] 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, and 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.

[0041] Please see Figures 1-13 The present invention provides a bridge steel box girder construction and installation structure, including a steel box girder 1 and a support frame 2. The support frame 2 is installed at the bottom end of the steel box girder 1. Installation blocks 4 are fixed on both sides of the bottom end of the steel box girder 1. Clamping grooves 7 are opened inside the bottom sides and both ends of the steel box girder 1. Fixing grooves 8 are opened inside the top end of the steel box girder 1. Installation structure 5 is set inside the fixing grooves 8.

[0042] The support frame 2 has a positioning structure 6 inside the top two sides and two ends. The positioning structure 6 includes a positioning groove 602. The positioning groove 602 is opened inside the top two sides and two ends of the support frame 2. A positioning block 601 is inserted inside the positioning groove 602. The top of the positioning block 601 is fixed to the bottom of the steel box girder 1. An installation hole 603 is opened inside one side of the positioning block 601. An installation bolt 604 is inserted inside the installation hole 603.

[0043] See Figure 9 and Figure 13When installing the steel box girder 1, a large crane is started to lift the steel box girder 1. After lifting, the steel box girder 1 is moved to the top of the support frame 2. When the steel box girder 1 is moved to the top of the support frame 2, the position of the steel box girder 1 is adjusted so that the positioning block 601 at the bottom of the support frame 2 is aligned with the top of the positioning groove 602. After alignment, the steel box girder 1 is lowered so that the positioning block 601 is inserted into the interior of the positioning groove 602. At this time, the cooperation of the positioning block 601 and the positioning groove 602 can position the installation position of the steel box girder 1, so that the steel box girder 1 will not be offset when it is installed at the top of the support frame 2, thereby completing the positioning and installation work of the steel box girder 1.

[0044] The mounting structure 5 includes a gear column 508, which is installed at both ends inside the fixing groove 8. Guide blocks 507 are fixed at both ends inside the fixing groove 8. A clamping frame 506 is installed inside the guide block 507. A clamping plate 5016 is fixed on one side of the clamping frame 506. A guide rod 5014 is fixed at the bottom end of the gear column 508 near the inside of the fixing groove 8. One end of the guide rod 5014 is fixed to one end inside the fixing groove 8. A movable frame 505 is installed on the outside of the gear column 508. A guide groove 5015 is opened inside the bottom end of the movable frame 505. Fixing blocks 5010 are fixed on both sides of the movable frame 505. A spring 5011 is installed at the top of the fixing block 5010. A fixing plate 509 is fixed at the top of the spring 5011. One side of the fixing plate 509 is fixed to one end inside the fixing groove 8.

[0045] Connecting blocks 5012 are fixed on both sides of mounting block 4. Rotating grooves 5013 are opened on both sides inside the fixing groove 8. A fixing shaft 503 is fixed inside the rotating groove 5013. A gear disk 502 is installed on the outside of the fixing shaft 503. Moving grooves 504 are opened on both sides inside the fixing groove 8. A fixing plate 501 is installed inside the moving groove 504. Two sets of clamping frames 506 are provided. The two sets of clamping frames 506 are symmetrically distributed on both sides of the gear column 508. The teeth on one side of the clamping frame 506 mesh with the gear column 508. The guide rod 5014 slides inside the guide groove 5015. The clamping frame 506 and the guide rod 5014 form a guiding connection. Two sets of springs 5011 are provided. The springs 5011 and the fixing plate 509 form a telescopic structure. The top of the fixing plate 501 is inserted into the clamping groove 7. The fixing plate 501 and the clamping groove 7 form an insertion structure.

[0046] See Figures 1-12When the steel box girder 1 is installed at the top of the support frame 2, the mounting block 4 at the bottom of the support frame 2 will be installed in the fixing groove 8 at the top of the support frame 2. When the mounting block 4 is inserted into the fixing groove 8 at the top of the support frame 2, as the mounting block 4 moves downward, it can move downward through the movable frame 505 at the bottom. When the movable frame 505 moves downward, it moves outside the guide rod 5014 through the guide groove 5015, thereby guiding the movable frame 505 and making the movable frame 505 more stable when moving downward. When the movable frame 505 moves downward, it will drive the fixing block 5010 to move downward, fixing... When block 5010 moves downward, it pulls spring 5011 to stretch. When moving frame 505 moves downward, the teeth on one side of the top of moving frame 505 mesh with gear column 508, thereby driving gear column 508 to rotate. When gear column 508 rotates, because one side of clamping frame 506 is provided with teeth, gear column 508, through its engagement with the teeth inside clamping frame 506, drives clamping frame 506 to move to one side. Through the cooperation between the two sets of clamping frames 506, after the mounting block 4 is inserted into the fixing groove 8 at the top of the steel box girder 1... The movable frame 505 is pressed against the bottom of the fixed groove 8 by the mounting block 4. When the movable frame 505 is pressed against the bottom of the fixed groove 8, the two sets of clamping frames 506 drive the two sets of clamping plates 5016 to press against both sides of the mounting block 4, thus using the weight of the steel box girder 1 to clamp and fix the mounting block 4. Using the weight of the steel box girder 1 to achieve clamping eliminates the need for additional power or force as required by external clamps or equipment. This not only saves energy but also simplifies the operation process, reduces construction costs and complexity. Furthermore, the weight of the steel box girder 1 is a continuous and stable force, which can provide support for the mounting block 4. Providing uniform and sustained pressure ensures that the mounting block 4 remains stable and fixed during the operation of the steel box girder 1, enhancing the overall stability and reliability of the steel box girder 1. Regardless of environmental conditions or usage status, the steel box girder 1's own weight is always present and plays a role. Even in special circumstances, such as natural disasters like earthquakes or strong winds, the clamping force generated by the weight of the steel box girder 1 can still maintain the position of the mounting block 4 to a certain extent, providing some protection for the steel box girder 1. Furthermore, there is no need to purchase, install, or maintain additional clamping equipment during installation, reducing equipment investment and related maintenance costs. At the same time, using its own weight for clamping avoids the potential failures and maintenance costs associated with using complex clamping systems, resulting in good economic efficiency. This clamping method does not cause additional damage or deformation to the structure of the steel box girder 1 and the mounting block 4. Compared with some external clamping methods, it avoids problems such as cracks and deformation of structural components due to excessive clamping or uneven local stress, thus helping to protect the integrity and durability of the bridge structure.

[0047] When the mounting block 4 moves downward, it also drives the connecting block 5012 to move downward. When the connecting block 5012 moves downward, it drives the gear disk 502 to rotate. When the gear disk 502 rotates, it meshes with the teeth on one side of the fixed plate 501, which drives the fixed plate 501 to move upward. When the fixed plate 501 moves upward, it moves inside the moving groove 504. At this time, the use of the moving groove 504 can guide the fixed plate 501, making the fixed plate 501 more stable when moving. When the mounting block 4 is fully inserted into the fixed groove 8 at the top of the support frame 2, the top of the fixed plate 501 will move upward and insert the top of the fixed plate 501 into the clamping groove 7 to clamp the steel box beam 1 again, thereby completing the installation and clamping work of the steel box beam 1.

[0048] A reinforcing structure 3 is provided at the connection between the steel box girder 1 and the support frame 2. The reinforcing structure 3 includes a support block 301, which is fixed to one side of the support frame 2. An installation plate 302 is fixed to the top of the support block 301, a first inclined frame 303 is fixed to the top of the installation plate 302, and a second inclined frame 304 is fixed to the top of the first inclined frame 303. The top of the second inclined frame 304 is fixed to the bottom of the steel box girder 1. The support block 301, the installation plate 302, the first inclined frame 303, and the second inclined frame 304 are welded together.

[0049] See Figure 1 and Figure 2 After the steel box girder 1 is installed on top of the support frame 2, the reinforcing structure 3 is fixed at the connection between the steel box girder 1 and the support frame 2. After fixing, the connection between the steel box girder 1 and the support frame 2 can be strengthened by the cooperation of the support block 301, the first inclined frame 303 and the second inclined frame 304. The setting of the reinforcing structure 3 can distribute the load transmitted from the steel box girder 1 more evenly on the steel box girder 1. Due to the stability of the triangle, stress concentration can be effectively avoided, and excessive stress in local structures can be reduced, thereby improving the overall load-bearing capacity of the structure and ensuring that the bridge can withstand various loads. The reinforcement of structure 3 ensures the safety and stability of the bridge structure under loads such as vehicle loads and wind loads. It also increases the rigidity of the connection between the steel box girder 1 and the support frame 2, limits the relative deformation of the steel box girder 1 and the support frame 2 under load, and makes the bridge structure maintain better integrity under stress. This reduces the risk of structural damage or performance impact due to excessive deformation, thus completing the reinforcement work. After the steel box girder 1 is installed, one end of the mounting bolt 604 is inserted through the inside of the support frame 2 and rotated into the mounting hole 603 to fix the positioning block 601, thus completing the installation of the steel box girder 1.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction and installation structure for a bridge steel box girder, characterized in that: Includes a steel box girder (1) and a support frame (2). The support frame (2) is installed at the bottom of the steel box girder (1). Mounting blocks (4) are fixed on both sides of the bottom of the steel box girder (1). Clamping grooves (7) are opened inside the bottom sides and both ends of the steel box girder (1). Fixing grooves (8) are opened inside the top of the steel box girder (1). An installation structure (5) is provided inside the fixing grooves (8). The mounting structure (5) includes a gear column (508), which is installed at both ends inside the fixing groove (8). Guide blocks (507) are fixed at both ends inside the fixing groove (8). A clamping frame (506) is installed inside the guide block (507). A clamping plate (5016) is fixed on one side of the clamping frame (506). A guide rod (5014) is fixed at the bottom end of the gear column (508) near the inside of the fixing groove (8). One end of the gear column (508) is fixed to the inside of the fixed groove (8). A movable frame (505) is installed on the outside of the gear column (508). A guide groove (5015) is opened inside the bottom end of the movable frame (505). Fixed blocks (5010) are fixed on both sides of the movable frame (505). A spring (5011) is installed on the top of the fixed block (5010). A fixing plate (509) is fixed on the top of the spring (5011). One side of the fixing plate (509) is fixed to the inside of the fixed groove (8). One end is fixed, and connecting blocks (5012) are fixed on both sides of the mounting block (4). Rotating grooves (5013) are opened on both sides inside the fixing groove (8). A fixing shaft (503) is fixed inside the rotating groove (5013). A gear disk (502) is installed on the outside of the fixing shaft (503). Moving grooves (504) are opened on both sides inside the fixing groove (8). A fixing plate (501) is installed inside the moving groove (504). The top two sides of the support frame (2) The support frame (2) is provided with positioning structures (6) at both ends. The positioning structures (6) include positioning grooves (602). The positioning grooves (602) are opened on both sides of the top of the support frame (2) and inside both ends. Positioning blocks (601) are inserted inside the positioning grooves (602). The top of the positioning blocks (601) is fixed to the bottom of the steel box girder (1). An installation hole (603) is opened inside one side of the positioning block (601). An installation bolt (604) is inserted inside the installation hole (603).

2. The bridge steel box girder construction and installation structure according to claim 1, characterized in that: The clamping frame (506) is provided in two sets, and the two sets of clamping frames (506) are symmetrically distributed on both sides of the gear column (508). The teeth on one side of the clamping frame (506) mesh with the gear column (508).

3. The bridge steel box girder construction and installation structure according to claim 1, characterized in that: The guide rod (5014) slides inside the guide groove (5015), and the clamping frame (506) and the guide rod (5014) form a guide connection.

4. The bridge steel box girder construction and installation structure according to claim 1, characterized in that: Two sets of springs (5011) are provided, and the springs (5011) and the fixing plate (509) form a telescopic structure.

5. The bridge steel box girder construction and installation structure according to claim 1, characterized in that: The top end of the fixing plate (501) is inserted into the interior of the clamping groove (7), and the fixing plate (501) and the clamping groove (7) form an insertion structure.

6. The bridge steel box girder construction and installation structure according to claim 1, characterized in that: A reinforcing structure (3) is provided at the connection between the steel box girder (1) and the support frame (2). The reinforcing structure (3) includes a support block (301). The support block (301) is fixed to one side of the support frame (2). An installation plate (302) is fixed to the top of the support block (301). A first inclined frame (303) is fixed to the top of the installation plate (302). A second inclined frame (304) is fixed to the top of the first inclined frame (303). The top of the second inclined frame (304) is fixed to the bottom of the steel box girder (1).

7. The bridge steel box girder construction and installation structure according to claim 6, characterized in that: The support block (301) is welded together with the mounting plate (302), the first inclined frame (303), and the second inclined frame (304).

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