Bridge steel box girder construction installation structure and installation method thereof

Abstract

The invention relates to the technical field of bridge construction, and provides a bridge steel box girder construction mounting structure and a mounting method thereof.The bridge steel box girder construction mounting structure comprises a steel box girder and a supporting frame, the supporting frame is mounted at the bottom end of the steel box girder, mounting blocks are fixed to the two sides of the bottom end of the steel box girder, and clamping grooves are formed in the two sides and the two ends of the bottom end of the steel box girder; a fixing groove is formed in the top end of the steel box girder, an installation structure is arranged in the fixing groove, the installation structure comprises gear columns, and the gear columns are installed at the two ends in the fixing groove. By arranging the mounting structure, when the steel box girder is mounted, in order to enable the steel box girder to be more convenient to mount, after a mounting block is inserted into a fixing groove in the top end of a supporting frame, a moving frame can be extruded to move downwards through the gravity of the mounting block, and when the moving frame moves downwards, through cooperation between the moving frame and a gear column, the steel box girder is more convenient to mount. And the two sets of clamping frames are driven to move towards the middle position, so that clamping of the mounting block is completed through the two sets of clamping plates.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a bridge steel box girder construction and installation structure and an installation method thereof. Background Art

[0002] Steel box girders are a common structural form for long-span bridges. Steel box girders, also known as steel plate box girders, are a type of bridge structure constructed by fully welded connections of top plates, bottom plates, webs, transverse diaphragms, longitudinal diaphragms, and stiffening ribs. Their box-like appearance gives them the name; they are a common structural form in bridge engineering, particularly for long-span bridges. Due to their light weight, high strength, high stability, and excellent wind and earthquake resistance, steel box girders have become important components in highways, urban rail transit, railways, airports, and other engineering fields. There are still some problems in the installation of bridge steel box girders. Traditional bridge steel box girders are usually installed with large cranes. However, when the box girder is installed on the support frame, workers are required to install and fix the connection between the bridge steel box girder and the support frame through connectors. The traditional connector fixing method is not only cumbersome in steps, but also troublesome in installation. Therefore, a bridge steel box girder construction and installation structure is needed to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a bridge steel box girder construction and installation structure and an installation method thereof, so as to solve the defects of the existing bridge steel box girder construction and installation steps being relatively cumbersome and troublesome during installation.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a bridge steel box girder construction and installation structure, comprising a steel box girder and a support frame, wherein the support frame is installed at the bottom end of the steel box girder, mounting blocks are fixed on both sides of the bottom end of the steel box girder, clamping grooves are opened inside the two sides and both ends of the bottom end of the steel box girder, a fixing groove is opened inside the top end of the steel box girder, and a mounting structure is provided inside the fixing groove; The mounting structure includes a gear column, which is mounted at both ends of the fixed slot, and guide blocks are fixed at both ends of the fixed slot, a clamping frame is installed inside the guide block, and a clamping plate is fixed to one side of the clamping frame, and a guide rod is fixed to one end of the bottom end of the gear column close to the inside of the fixed slot, and one end of the guide rod is fixed to one end of the inside of the fixed slot, a movable frame is installed on the outside of the gear column, and a guide slot is opened inside the bottom end of the movable frame, and fixed blocks are fixed on both sides of the movable frame, a spring is installed on the top of the fixed block, and a fixing plate is fixed on the top of the spring, and one side of the fixing plate is fixed to one end of the inside of the fixed slot.

[0005] Preferably, connecting blocks are fixed on both sides of the mounting block, rotating grooves are opened on both sides of the fixed groove, a fixed shaft is fixed inside the rotating groove, a gear plate is installed on the outside of the fixed shaft, movable grooves are opened on both sides of the fixed groove, and a fixed plate is installed inside the movable groove.

[0006] Preferably, two groups of the clamping frames are provided, and the two groups of the clamping frames are symmetrically distributed on both sides of the gear column, and the teeth on one side inside the clamping frame are meshed with the gear column.

[0007] Preferably, the guide rod slides inside the guide groove, and a guiding connection is formed between the clamping frame and the guide rod.

[0008] Preferably, two groups of springs are provided, and a telescopic structure is formed between the springs and the fixing plate.

[0009] Preferably, the top end of the fixing plate is inserted into the interior of the clamping groove, and an insertion structure is formed between the fixing plate and the clamping groove.

[0010] Preferably, a reinforcement structure is provided at the connection between the steel box girder and the support frame, and the reinforcement structure includes a support block, the support block is fixed to one side of the support frame, the top of the support block is fixed with a mounting plate, the top of the mounting plate is fixed with a first diagonal frame, the top of the first diagonal frame is fixed with a second diagonal frame, and the top of the second diagonal frame is fixed to the bottom end of the steel box girder.

[0011] Preferably, the support block is welded integrally with the mounting plate, the first oblique frame and the second oblique frame.

[0012] Preferably, a positioning structure is provided inside both sides and both ends of the top of the support frame, and the positioning structure includes a positioning groove, which is opened inside both sides and both ends of the top of the support frame, and a positioning block is inserted into the positioning groove, and the top of the positioning block is fixed to the bottom end of the steel box beam, and a mounting hole is opened inside one side of the positioning block, and a mounting bolt is inserted into the mounting hole.

[0013] Preferably, a method for constructing and installing a bridge steel box girder comprises the following steps, characterized in that: S1. When installing the steel box girder, start the 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 moves 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 slot. After alignment, lower the steel box girder so that the positioning block is inserted into the interior of the positioning slot. At this time, the positioning block and the positioning slot are used in conjunction to locate the installation position of the steel box girder so that the steel box girder will not be offset when installed on the top of the support frame, thereby completing the positioning and installation of the steel box girder. S2. When the steel box girder is installed on the top of the support frame, the mounting block at the bottom of the support frame is installed in the fixed groove at the top of the support frame. When the mounting block is inserted into the fixed groove at the top of the support frame, as the mounting block moves downward, the movable frame at the bottom can move downward. When the movable frame moves downward, it moves outside the guide rod through the guide groove, thereby guiding the movable frame and making it more stable when moving downward. When the gear train is in gear, the gears on one side of the gear train are engaged with the gears on the gear train, thereby driving the gear train to move to one side. When the gear train is in gear, the gears on one side of the gear train are engaged with the gears on the gear train, thereby driving the gear train to move to one side. By coordinating the two sets of clamping frames, after the mounting block is inserted into the fixed groove at the top of the steel box beam, the movable frame is pressed against the bottom end of the fixed groove by the mounting block. When the movable frame is pressed against the bottom end of the fixed groove, the two sets of clamping frames drive the two sets of clamping plates to press against both sides of the mounting block, thereby clamping and fixing the mounting block by the gravity of the steel box beam itself. S4. When the mounting block moves downward, it also drives the connecting block downward. When the connecting block moves downward, it drives the gear plate to rotate. When the gear plate rotates, it engages 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 movable groove. At this time, the use of the movable groove can guide the fixed plate, making 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 so that the top of the fixed plate is inserted into the inside of the clamping groove to clamp the steel box girder again, thereby completing the installation and clamping of the steel box girder. S5. After the steel box girder is installed on the top of the support frame, the reinforcement structure is fixed at the connection between the steel box girder and the support frame. After the fixation is completed, the connection between the steel box girder and the support frame can be strengthened by using the support block, the first diagonal frame and the second diagonal frame to complete the reinforcement work. After the installation of the steel box girder is completed, one end of the installation bolt is passed through the inside of one side of the support frame and rotated into the inside of the installation hole to complete the fixation of the positioning block, and finally complete the installation of the steel box girder.

[0014] The invention provides a bridge steel box girder construction and installation structure and an installation method thereof, which have the following advantages: By providing an installation structure, when installing the steel box girder, in order to make the installation of the steel box girder more convenient, after the installation block is inserted into the fixing groove at the top of the support frame, it will use its own gravity to squeeze the moving frame to move downward. When the moving frame moves downward, the cooperation between the moving frame and the gear column drives the two sets of clamping frames to move to the middle position, thereby completing the clamping of the installation block through the two sets of clamping plates; Furthermore, the weight of the steel box girder itself is used to clamp the mounting blocks during clamping, without the need for additional power or force as with external clamps or equipment. This not only saves energy, but also simplifies the operating process, reduces construction costs and complexity, and the weight of the steel box girder is a continuous and stable force that can provide uniform and lasting pressure for the mounting blocks, so that the mounting blocks remain in a stable fixed state during the operation of the steel box girder, which helps to enhance the stability and reliability of the overall structure of the steel box girder. Regardless of the environmental conditions or usage status of the steel box girder, its own weight always exists and plays a role. Even in some special circumstances, such as natural disasters such as earthquakes and strong winds, the clamping force generated by the weight of the steel box girder can still maintain the position of the mounting blocks to a certain extent, providing certain protection for the steel box girder. Furthermore, after the mounting block is installed in the fixing groove at the top of the support frame, the connection block and the gear plate can be used in conjunction to move the fixing plate upward, so that the fixing plate is inserted into the inside of the clamping groove to perform secondary position clamping on the steel box beam, making it more stable after the support frame is installed. By setting up a reinforcement structure, after the steel box girder and the support frame are installed, the connection between the steel box girder and the support frame can be strengthened through the coordinated use of the support block, the first diagonal frame and the second diagonal frame. The setting of the reinforcement structure can more evenly distribute the load transmitted from the steel box girder to the support frame. Due to the stability of the triangle, it can effectively avoid stress concentration and reduce the occurrence of excessive stress in local parts of the structure, thereby improving the overall bearing capacity of the structure and ensuring the safety and stability of the bridge under various loads such as vehicle loads, wind loads, etc., thereby completing the reinforcement work. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention when viewed from above; Figure 3 It is a schematic diagram of a partial cross-section exploded three-dimensional structure in a side view of the present invention; Figure 4 This is a schematic diagram of a partial cross-section exploded three-dimensional structure viewed from above of the present invention; Figure 5 This is a schematic diagram of a three-dimensional structure of a top view of a mounting structure of the present invention; Figure 6This is a schematic diagram of a three-dimensional structure of the mounting structure of the present invention when viewed from above; Figure 7 It is a schematic diagram of a three-dimensional structure of a side cross-section of the mounting structure of the present invention; Figure 8 for Figure 7 A in the middle is a partial enlarged schematic diagram of the three-dimensional structure; Figure 9 It is a schematic diagram of a three-dimensional structure of a mobile frame of the present invention in a top view; Figure 10 It is a schematic diagram of the three-dimensional structure of the mobile frame of the present invention in side view; Figure 11 This is a schematic diagram of the three-dimensional structure of the mobile frame of the present invention when viewed from above; Figure 12 It is a schematic diagram of the three-dimensional structure of the mobile frame of the present invention from a side view; Figure 13 It is a schematic diagram of the three-dimensional structure of the positioning structure of the present invention in a side view and section.

[0016] Explanation of the reference numerals in the figure: 1. Steel box girder; 2. Support frame; 3. Reinforcement structure; 301. Support block; 302. Mounting plate; 303. First diagonal frame; 304. Second diagonal frame; 4. Mounting block; 5. Mounting structure; 501. Fixed plate; 502. Gear plate; 503. Fixed shaft; 504. Moving groove; 505. Moving frame; 506. Clamping frame; 507. Guide block; 508. Gear column; 509. Fixed plate; 5010. Fixed 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. Fixed groove. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figures 1-13 The present invention provides a bridge steel box girder construction and installation structure, comprising 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, and mounting blocks 4 are fixed on both sides of the bottom end of the steel box girder 1. Clamping grooves 7 are opened on both sides and both ends of the bottom end of the steel box girder 1. A fixing groove 8 is opened inside the top end of the steel box girder 1, and a mounting structure 5 is arranged inside the fixing groove 8. A positioning structure 6 is provided inside the top and ends of the support frame 2. The positioning structure 6 includes a positioning groove 602. The positioning groove 602 is provided inside the top and ends of the support frame 2. A positioning block 601 is inserted into the positioning groove 602. The top of the positioning block 601 is fixed to the bottom end of the steel box girder 1. A mounting hole 603 is provided inside one side of the positioning block 601. A mounting bolt 604 is inserted into the mounting hole 603. See Figure 9 and Figure 13 : When installing the steel box girder 1, start the large crane to lift the steel box girder 1. After lifting, move the steel box girder 1 to the top of the support frame 2. When the steel box girder 1 moves to the top of the support frame 2 and adjusts the position of the steel box girder 1, align the positioning block 601 at the bottom end of the support frame 2 with the top of the positioning groove 602. After alignment, lower the steel box girder 1 so that the positioning block 601 is inserted into the interior of the positioning groove 602. At this time, the positioning block 601 and the positioning groove 602 are used in conjunction to locate the installation position of the steel box girder 1, so that the steel box girder 1 will not be offset when it is installed on the top of the support frame 2, thereby completing the positioning and installation work of the steel box girder 1. The mounting structure 5 includes a gear column 508, which is mounted at both ends of the fixed groove 8. Guide blocks 507 are fixed at both ends of the fixed groove 8. A clamping frame 506 is mounted inside the guide block 507. A clamping plate 5016 is fixed to one side of the clamping frame 506. A guide rod 5014 is fixed to one end of the bottom end of the gear column 508 close to the inside of the fixed groove 8. One end of the guide rod 5014 is fixed to one end of the inside of the fixed groove 8. A movable frame 505 is mounted on the outside of the gear column 508. A guide groove 5015 is provided 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 mounted on the top of the fixed block 5010. A fixing plate 509 is fixed to the top of the spring 5011. One side of the fixing plate 509 is fixed to one end of the inside of the fixed groove 8. The two sides of the mounting block 4 are fixed with connecting blocks 5012, and rotating grooves 5013 are provided on both sides of the interior of the fixed groove 8. A fixed shaft 503 is fixed inside the rotating groove 5013, and a gear plate 502 is installed on the outside of the fixed shaft 503. Moving grooves 504 are provided on both sides of the interior of the fixed groove 8. A fixed plate 501 is installed inside the movable groove 504. Two groups of clamping frames 506 are symmetrically distributed on both sides of the gear column 508. The teeth on one side of the interior of the clamping frame 506 are meshed with the gear column 508. The guide rod 5014 slides inside the guide groove 5015, and a guiding connection is formed between the clamping frame 506 and the guide rod 5014. Two groups of springs 5011 are provided, and a telescopic structure is formed between the spring 5011 and the fixing plate 509. The top end of the fixing plate 501 is inserted into the interior of the clamping groove 7, and an insertion structure is formed between the fixing plate 501 and the clamping groove 7; See Figures 1-12 : When the steel box girder 1 is installed on the top of the support frame 2, the mounting block 4 at the bottom of the support frame 2 will be installed in the fixed groove 8 at the top of the support frame 2. When the mounting block 4 is inserted into the fixed 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 on the outside of the guide rod 5014 through the guide groove 5015, thereby guiding the movable frame 505, making the movable frame 505 more stable when moving downward. When the movable frame 505 moves downward, it will drive the fixed block 5010 to move downward, and the fixed When the block 5010 moves downward, the spring 5011 is pulled to stretch. When the movable frame 505 moves downward, the teeth on one side of the top of the movable frame 505 are meshed with the gear column 508, thereby driving the gear column 508 to rotate. When the gear column 508 rotates, since one side of the clamping frame 506 is provided with teeth, the gear column 508 cooperates with the teeth inside the clamping frame 506 when rotating, thereby driving the 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 mobile frame 505 is just pressed against the bottom end of the fixed groove 8 by the installation block 4. When the mobile frame 505 is pressed against the bottom end of the fixed groove 8, the two sets of clamping frames 506 just drive the two sets of clamping plates 5016 to press against the two sides of the installation block 4, and use the gravity of the steel box beam 1 itself to clamp and fix the installation block 4. The steel box beam 1 is clamped by its own gravity, and there is no need to provide additional power or force like using external clamps or equipment. This not only saves energy, but also simplifies the operation process, reduces construction cost and complexity, and the gravity of the steel box beam 1 is a continuous and stable force, which can clamp the installation block 4. Providing uniform and lasting pressure allows the mounting block 4 to maintain a stable fixed state during the operation of the steel box girder 1, which helps to enhance the stability and reliability of the overall structure of the steel box girder 1. Regardless of the environmental conditions or usage status of the steel box girder 1, its own gravity always exists and plays a role. Even in some special circumstances, such as encountering natural disasters such as earthquakes and strong winds, the clamping force generated by the gravity of the steel box girder 1 can still maintain the position of the mounting block 4 to a certain extent, providing certain protection for the steel box girder 1. In addition, there is no need to purchase, install and maintain additional clamping equipment during installation, reducing equipment investment and related maintenance costs. At the same time, using its own gravity for clamping avoids the possible failures and maintenance costs caused by the use of complex clamping systems, and has good economic efficiency. This clamping method will 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 will not cause cracks, deformation and other problems in the structural components due to excessive clamping or local uneven force, which is conducive to protecting the integrity and durability of the bridge structure. When the mounting block 4 moves downward, it will also drive the connecting block 5012 to move downward. When the connecting block 5012 moves downward, it will drive the gear plate 502 to rotate. When the gear plate 502 rotates, it will engage with the teeth on one side of the fixed plate 501, which will drive the fixed plate 501 to move upward. When the fixed plate 501 moves upward, it will move 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 completely inserted into the fixing groove 8 at the top of the support frame 2, the top of the fixed plate 501 will move upward so that the top of the fixed plate 501 is inserted into the inside of the clamping groove 7 to clamp the steel box girder 1 again, thereby completing the installation and clamping work of the steel box girder 1. A reinforcement structure 3 is provided at the connection between the steel box girder 1 and the support frame 2. The reinforcement structure 3 includes a support block 301, which is fixed to one side of the support frame 2. A mounting plate 302 is fixed to the top of the support block 301, a first diagonal frame 303 is fixed to the top of the mounting plate 302, a second diagonal frame 304 is fixed to the top of the first diagonal frame 303, and the top of the second diagonal frame 304 is fixed to the bottom end of the steel box girder 1. The support block 301, the mounting plate 302, the first diagonal frame 303, and the second diagonal frame 304 are welded together. See Figure 1 and Figure 2 :When the steel box girder 1 is installed on the top of the support frame 2, the reinforcement structure 3 is fixed to the connection between the steel box girder 1 and the support frame 2. After the fixation is completed, the connection between the steel box girder 1 and the support frame 2 can be strengthened by using the support block 301, the first oblique frame 303 and the second oblique frame 304. The setting of the reinforcement structure 3 can distribute the load transmitted from the steel box girder 1 more evenly to the steel box girder 1. Due to the stability of the triangle, it can effectively avoid stress concentration and reduce the occurrence of excessive stress in the local part of the structure, thereby improving the overall bearing capacity of the structure and ensuring that the bridge can withstand various loads. The safety and stability of the bridge can be ensured by loads such as vehicle loads and wind loads, and the setting of the reinforcement structure 3 can also increase the rigidity of the connection between the steel box girder 1 and the support frame 2, limit the relative deformation of the steel box girder 1 and the support frame 2 under the action of load, and make the bridge structure maintain better integrity when subjected to stress, reduce the risk of structural damage or impact on performance due to excessive deformation, thereby completing the reinforcement work. After the installation of the steel box girder 1 is completed, one end of the mounting bolt 604 is passed through the inside of one side of the support frame 2 and rotated into the inside of the mounting hole 603 to complete the fixation of the positioning block 601, and finally complete the installation of the steel box girder 1.

[0019] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bridge steel box girder construction and installation structure, characterized by: The invention comprises a steel box girder (1) and a support frame (2), wherein the support frame (2) is installed at the bottom end of the steel box girder (1), mounting blocks (4) are fixed on both sides of the bottom end of the steel box girder (1), clamping grooves (7) are provided on both sides and both ends of the bottom end of the steel box girder (1), a fixing groove (8) is provided on the top end of the steel box girder (1), and a mounting structure (5) is provided inside the fixing groove (8); The mounting structure (5) includes a gear column (508), the gear column (508) is mounted at both ends of the interior of the fixed groove (8), the two ends of the interior of the fixed groove (8) are fixed with guide blocks (507), the interior of the guide block (507) is installed with a clamping frame (506), one side of the clamping frame (506) is fixed with a clamping plate (5016), the bottom end of the gear column (508) close to the interior of the fixed groove (8) is fixed with a guide rod (5014), one end of the guide rod (5014) is connected to the inner side of the fixed groove (8), and the inner side of the fixed groove (8) is connected to the guide rod (5014). One end inside the fixed groove (8) is fixed, a movable frame (505) is installed on the outer side 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 fixed plate (509) is fixed on the top of the spring (5011), and one side of the fixed plate (509) is fixed to one end inside the fixed groove (8).

2. A bridge steel box girder construction and installation structure according to claim 1, characterized in that: Connecting blocks (5012) are fixed on both sides of the mounting block (4); rotating grooves (5013) are provided on both sides of the interior of the fixed groove (8); a fixed shaft (503) is fixed inside the rotating groove (5013); a gear plate (502) is installed on the outside of the fixed shaft (503); moving grooves (504) are provided on both sides of the interior of the fixed groove (8); and a fixing plate (501) is installed inside the moving groove (504).

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

4. 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 a guiding connection is formed between the clamping frame (506) and the guide rod (5014).

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

6. The bridge steel box girder construction and installation structure according to claim 2, characterized in that: The top end of the fixing plate (501) is inserted into the interior of the clamping groove (7), and an insertion structure is formed between the fixing plate (501) and the clamping groove (7).

7. The bridge steel box girder construction and installation structure according to claim 1, characterized in that: A reinforcement structure (3) is provided at the connection between the steel box girder (1) and the support frame (2), the reinforcement structure (3) comprising a support block (301), the support block (301) being fixed to one side of the support frame (2), a mounting plate (302) being fixed to the top end of the support block (301), a first oblique frame (303) being fixed to the top end of the mounting plate (302), a second oblique frame (304) being fixed to the top end of the first oblique frame (303), and a top end of the second oblique frame (304) being fixed to the bottom end of the steel box girder (1).

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

9. The bridge steel box girder construction and installation structure according to claim 1, characterized in that: Positioning structures (6) are provided inside the two sides and two ends of the top of the support frame (2), and the positioning structure (6) includes positioning grooves (602). The positioning grooves (602) are provided inside the two sides and two ends of the top of the support frame (2), and positioning blocks (601) are inserted inside the positioning grooves (602). The top of the positioning block (601) is fixed to the bottom end of the steel box girder (1), and a mounting hole (603) is provided inside one side of the positioning block (601), and a mounting bolt (604) is inserted inside the mounting hole (603).

10. A method for constructing and installing a bridge steel box girder, comprising the following steps, characterized in that: S1. When installing the steel box girder (1), start the large crane to lift the steel box girder (1), and after lifting, move the steel box girder (1) to the top of the support frame (2). When the steel box girder (1) is moved to the top of the support frame (2), adjust the position of the steel box girder (1) so that the positioning block (601) at the bottom end of the support frame (2) is aligned with the top end of the positioning groove (602). After alignment, lower the steel box girder (1) so that the positioning block (601) is inserted into the inside of the positioning groove (602). At this time, the positioning block (601) and the positioning groove (602) are used in conjunction to locate the installation position of the steel box girder (1), so that the steel box girder (1) will not be offset when it is installed on the top end of the support frame (2), thereby completing the positioning and installation work of the steel box girder (1); S2. When the steel box girder (1) is installed on the top of the support frame (2), the mounting block (4) at the bottom of the support frame (2) is 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, the movable frame (505) at the bottom moves downward. 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. S3. When the movable frame (505) moves downward, it drives the fixed block (5010) to move downward. When the fixed block (5010) moves downward, it pulls the spring (5011) to stretch. When the movable frame (505) moves downward, the teeth on one side of the top of the movable frame (505) engage with the gear column (508), thereby driving the gear column (508) to rotate. When the gear column (508) rotates, since one side of the inside of the clamping frame (506) is provided with teeth, the gear column (508) rotates by engaging with the teeth inside the clamping frame (506). The two sets of clamping frames (506) are combined, thereby driving the clamping frame (506) to move to one side. Through the cooperation between the two sets of clamping frames (506), after the installation block (4) is inserted into the fixed groove (8) at the top of the steel box beam (1), the movable frame (505) is just pressed against the bottom end of the inside of the fixed groove (8) by the installation block (4). When the movable frame (505) is pressed against the bottom end of the inside of the fixed groove (8), the two sets of clamping frames (506) just drive the two sets of clamping plates (5016) to press against the two sides of the installation block (4), so as to realize the use of the weight of the steel box beam (1) itself to clamp and fix the installation block (4); S4. 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 plate (502) to rotate. When the gear plate (502) rotates, it engages with the teeth on one side of the fixed plate (501), and 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) to make the fixed plate (501) more stable when moving. When the mounting block (4) is completely inserted into the fixing groove (8) at the top of the support frame (2), the top of the fixed plate (501) moves upward so that the top of the fixed plate (501) is inserted into the inside of the clamping groove (7) to clamp the steel box girder (1) again, thereby completing the installation and clamping work of the steel box girder (1); S5. After the steel box girder (1) is installed on the top of the support frame (2), the reinforcement structure (3) is fixed to the connection between the steel box girder (1) and the support frame (2). After the fixing is completed, the connection between the steel box girder (1) and the support frame (2) can be strengthened by using the support block (301), the first inclined frame (303) and the second inclined frame (304), thereby completing the strengthening work. After the steel box girder (1) is installed, one end of the installation bolt (604) is passed through the inside of one side of the support frame (2) and rotated to install it into the inside of the installation hole (603), completing the fixing of the positioning block (601), and finally completing the installation work of the steel box girder (1).

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