Large-span multi-connected steel beam sub-connection cutting control method

Abstract

This invention belongs to the field of bridge construction technology, specifically a method for controlling the segmented cutting of large-span multi-section steel beams. The method includes the following steps: Step 1: Preparation: After the steel box girder is pushed to the pier at the construction location by a jacking mechanism, the jacking mechanism is used to control the steel box girder to rise above the pier, forming a cutting gap. This method for controlling the segmented cutting of large-span multi-section steel beams utilizes a cutting mechanism to automatically perform cutting operations on the temporarily welded parts of the steel box girder after the jacking construction. During cutting, pressure sensors monitor the cutting pressure in real time and automatically adjust the cutting position. The cutting equipment automatically moves around the surface of the steel box girder for cutting, enhancing cutting efficiency and avoiding the slow cutting efficiency and personnel injury caused by sparks during cutting, which are common in existing methods.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for controlling the segmented cutting of large-span multi-section steel beams. Background Technology

[0002] In bridge construction, most projects currently adopt the construction method of jacking up the whole and then lowering the connected steel box girders. Before the jacking construction, the two connected steel box girders need to be temporarily welded together to form a whole. However, before lowering the girders, the temporary connection between the connected parts needs to be cut off.

[0003] Currently, most cutting operations involve manual hand-held flame cutting devices that are moved and cut at the designated cutting position. However, the negative bending moment of the steel beams between the joints at the piers is extremely large, posing significant safety risks during cutting and making it difficult to control construction quality. Furthermore, the cutting process can cause sparks to fly, resulting in injuries to construction workers. Additionally, the steel box girders of bridges require welding all four sides to enhance their strength during temporary welding, which makes cutting on both sides and the bottom difficult and inefficient. Therefore, a method for controlling the split cutting of large-span multi-joint steel beams is needed. Summary of the Invention

[0004] Based on existing technical problems, this invention proposes a method for controlling the split cutting of large-span multi-section steel beams.

[0005] The present invention proposes a method for controlling the split cutting of a large-span multi-section steel beam, which includes the following steps: Step 1, preparation: After the steel box girder is pushed to the pier above the construction position by the jacking mechanism, the jacking mechanism is first used to control the steel box girder to be lifted above the pier to form a cutting gap, and then the cutting equipment is controlled to move to the cutting position to connect and form a whole. It is also checked that it is in normal working condition. During the cutting, the oxygen cutting mechanism is used to perform the cutting operation and the cutting area is cleaned.

[0006] Step 2: Determine the cutting position: Before the jacking construction of the steel box girder, take the pressure sensor and install it on the end face of the steel box girder connection. Then, temporarily weld the whole through the connector. During the cutting, analyze the pressure state detected by the pressure sensor surface to determine the initial cutting position, and then mark the position to be cut on the steel box girder.

[0007] Step 3: Set cutting parameters: Based on the properties and requirements of the steel box girder material, set the corresponding cutting parameters, specifically including cutting speed and cutting depth;

[0008] Step 4, Safety Measures: Before performing the cutting operation, ensure that personnel in the vicinity leave the cutting area and wear necessary safety protective equipment;

[0009] Step 5: Start cutting: Based on the cutting position, use the cutting equipment to perform automatic walking cutting operation, control the cutting direction and speed, and ensure that the cutting lines are straight and accurate;

[0010] Step Six: Monitor Cutting Quality: During the cutting process, adjust the cutting position in a timely manner by observing the pressure values ​​of multiple pressure sensors;

[0011] Step 7: Complete the cutting: After completing all cutting operations, turn off the cutting equipment and perform cleaning and tidying.

[0012] Preferably, the cutting device includes a drive base, and two drive bases are symmetrically arranged about the axis of the steel box girder. The inner wall of the drive base is respectively provided with a horizontal walking mechanism, a ring walking mechanism, a wireless connection conductive mechanism, a cutting pipe wiring mechanism and a cutting mechanism. The drive base is also provided with a clamping and positioning mechanism. The top and bottom of the two drive bases are provided with a connecting mechanism.

[0013] The horizontal walking mechanism enables the two drive seats to move horizontally along the edge line of the steel box girder;

[0014] The circular walking mechanism enables the cutting mechanism to perform circular walking and cutting actions.

[0015] The wireless connection conductive mechanism enables the cutting mechanism to be wirelessly connected and powered.

[0016] The cutting pipeline routing mechanism enables the cutting mechanism to move and the oxygen pipeline to follow the routing action.

[0017] The cutting mechanism performs the cutting action at the temporary welding position of the steel box girder;

[0018] The clamping and positioning mechanism enables the two drive seats to be clamped onto the steel box girder during the cutting operation;

[0019] The connecting mechanism enables the two drive seats to connect in a ring-shaped manner.

[0020] Preferably, the horizontal traveling mechanism includes a T-shaped fixed shaft, the top of which is fixedly installed to the bottom of the drive seat, and both ends of the T-shaped fixed shaft are rotatably connected to traveling wheels via bearings, with the surfaces of the plurality of traveling wheels slidably inserted into the top surface of the steel box girder.

[0021] Preferably, the annular walking mechanism includes an annular rack, the surface of which is fixedly mounted to the surface of the drive seat. An annular guide rail is also fixedly mounted on the surface of the drive seat. The annular guide rail is located on one side of the annular rack. A slider is slidably inserted into the surface of the annular guide rail. A drive motor is fixedly mounted on one side of the slider. A gear shaft is fixedly mounted on the output shaft of the drive motor through a coupling. A gear is fixedly mounted on one end of the gear shaft. The teeth of the gear mesh with the tooth grooves of the annular rack.

[0022] Preferably, the wireless connection conductive mechanism includes an annular conductive ring, the surface of which is fixedly mounted to the surface of the drive seat via an insulating pad. The annular conductive ring is located in the middle of the annular guide rail and the annular rack. A connecting seat is also fixedly mounted on one side surface of the slider. A carbon brush is fixedly mounted on the surface of the connecting seat. The conductive end of the carbon brush is electrically connected to the conductive surface of the annular conductive ring. The carbon brush is electrically connected to the drive motor.

[0023] Preferably, the cutting mechanism includes an electric telescopic rod, which is installed at the bottom of the slider. A connecting plate is fixedly installed at the telescopic bottom end of the electric telescopic rod. A cutting gun is fixedly installed at one end of the connecting plate. The spray end of the cutting gun corresponds to the temporary welding ends of the two steel box girders. A connecting air pipe is fixedly installed at the other end of the cutting gun. The cutting gun is electrically connected to the carbon brush.

[0024] Preferably, the clamping and positioning mechanism includes a drive cavity opened inside the drive seat, the clamping ends of the two drive cavities are opposite each other, and a connecting hole is fixedly connected to one side of each of the two drive cavities. A piston is slidably inserted into the inner wall of the drive cavity through a sealing ring. A clamping rod is fixedly installed at one end of the piston. One end of the clamping rod penetrates through and extends to the outer surface of the drive seat and is pressed against the surface of the steel box girder.

[0025] Preferably, a spring is movably sleeved on the surface of the clamping rod, one end of the spring presses against the surface of the piston, the other end of the spring presses against the inner wall of the drive chamber, and an oil inlet pipe is fixedly installed on the inner wall of the connecting hole.

[0026] Preferably, the connecting mechanism includes a snap-fit ​​crossbar, with slots provided at the top and bottom of both drive seats. The two ends of the snap-fit ​​crossbar are respectively connected to the inner walls of the two opposing slots by screw threads. Connecting guide rails, connecting conductive plates, connecting racks, and connecting cable routing blocks are respectively fixedly installed on the surface of the snap-fit ​​crossbar. The two ends of the connecting guide rails are respectively connected to the surfaces of the two annular guide rails at both ends. The two ends of the connecting conductive plates are respectively connected to the surfaces of the two annular conductive rings at both ends. The two ends of the connecting racks are respectively connected to the surfaces of the two annular racks at both ends.

[0027] Preferably, the pipe cutting and routing mechanism includes annular routing blocks. The two ends of the connecting routing blocks are respectively connected to the surfaces of the two annular routing blocks at both ends. Routing grooves are formed on the surfaces of the two annular routing blocks and the two connecting routing blocks. A connecting pipe is slidably inserted into the inner wall of the routing groove. One end of the connecting pipe is fixedly installed with one end of the connecting air pipe. A flexible air pipe is fixedly installed at the other end of the connecting pipe. A transition groove is also formed at one end of the locking crossbar. The inner wall of the transition groove is slidably inserted into the surface of the flexible air pipe.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. By cutting large-span multi-section steel beams into independent parts, the self-weight load of each part can be reduced; this helps to reduce the stress on the overall bridge structure and alleviate the load on the bridge; after being cut into sections, each independent part of the large-span multi-section steel beam can more flexibly adapt to earthquakes and temperature deformation; when earthquakes or temperature changes occur, each independent part can move and deform relatively freely, reducing stress concentration and damage risk to the overall structure; through section cutting, stress concentration and fatigue damage to the bridge structure can be reduced, extending the service life of the overall bridge.

[0030] 2. This invention utilizes a cutting mechanism to automatically perform walking and cutting operations on the temporarily welded parts of the steel box girder after the jacking construction. During the cutting process, a pressure sensor monitors the extrusion pressure in real time and automatically adjusts the cutting position. The cutting equipment automatically moves around the surface of the steel box girder to perform cutting operations, which enhances the cutting efficiency and avoids the slow cutting efficiency and personnel injury caused by sparks during the cutting process, which are all done manually by hand. Attached Figure Description

[0031] Figure 1 A schematic diagram of a method for controlling the split-segment cutting of a large-span multi-section steel beam;

[0032] Figure 2 A three-dimensional view of the drive seat structure for a method of controlling the split cutting of a large-span multi-section steel beam;

[0033] Figure 3 A three-dimensional diagram of a horizontal walking mechanism for a method of controlling the split cutting of large-span multi-section steel beams;

[0034] Figure 4 Exploded view of the horizontal walking mechanism for a method of segmented cutting control of large-span multi-section steel beams;

[0035] Figure 5 A method for controlling the split cutting of large-span multi-span steel beams Figure 4Enlarged view of the structure at point A in the middle;

[0036] Figure 6 A three-dimensional diagram of the connection mechanism for a method of controlling the split cutting of a large-span multi-section steel beam;

[0037] Figure 7 A method for controlling the split cutting of large-span multi-span steel beams Figure 6 Enlarged view of the structure at point B in the middle;

[0038] Figure 8 This is a three-dimensional diagram of the clamping and positioning mechanism for a method of controlling the split cutting of large-span multi-section steel beams.

[0039] In the diagram: 1. Steel box girder; 2. Pier; 3. Pressure sensor; 4. Drive seat; 5. Horizontal traveling mechanism; 51. T-shaped fixed shaft; 52. Traveling wheel; 6. Circular traveling mechanism; 61. Circular rack; 62. Circular guide rail; 63. Slider; 64. Drive motor; 65. Gear shaft; 66. Gear; 7. Wireless connection conductive mechanism; 71. Circular conductive ring; 72. Connecting seat; 73. Carbon brush; 8. Pipe cutting and wiring mechanism; 81. Circular wiring block; 82. Wiring groove; 83. Connecting link 84. Flexible air hose; 85. Transition groove; 9. Cutting mechanism; 91. Electric telescopic rod; 92. Connecting plate; 93. Cutting gun; 94. Connecting air hose; 10. Clamping and positioning mechanism; 101. Drive chamber; 102. Connecting hole; 103. Piston; 104. Clamping rod; 105. Spring; 106. Oil inlet pipe; 11. Connecting mechanism; 111. Snap-fit ​​crossbar; 112. Slot; 113. Connecting guide rail; 114. Connecting conductive plate; 115. Connecting rack; 116. Connecting cable routing block. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] Reference Figures 1-8 A method for controlling the split cutting of a large-span multi-span steel beam includes the following steps: Step 1: Preparation: After the steel box girder 1 is pushed to the pier 2 above the construction position by the jacking mechanism, the jacking mechanism is first used to control the steel box girder 1 to be raised above the pier 2 to form a cutting gap. Then, the cutting equipment is controlled to move to the cutting position to connect and form a whole. It is checked that it is in normal working condition. During the cutting, the oxygen cutting mechanism is used to perform the cutting operation and the cutting area is cleaned.

[0042] The cutting equipment includes a drive base 4, with two drive bases 4 symmetrically arranged around the axis of the steel box girder 1. The inner walls of the drive bases 4 are respectively provided with a horizontal walking mechanism 5, a ring walking mechanism 6, a wireless connection conductive mechanism 7, a cutting pipe wiring mechanism 8, and a cutting mechanism 9. The drive base 4 is also provided with a clamping and positioning mechanism 10. The top and bottom of the two drive bases 4 are provided with a connecting mechanism 11.

[0043] Step 2: Determine the cutting position: Before the jacking construction of steel box girder 1, take pressure sensor 3 and install it on the end face of the connection of steel box girder 1. Then, temporarily weld the whole through the connector. During the cutting, analyze the pressure state detected by the surface of pressure sensor 3 to determine the initial cutting position, and then mark the position to be cut on steel box girder 1.

[0044] Step 3: Set cutting parameters: Based on the properties and requirements of the material of the steel box girder 1, set the corresponding cutting parameters, including cutting speed and cutting depth.

[0045] Step 4, Safety Measures: Before performing the cutting operation, ensure that personnel in the vicinity leave the cutting area and wear necessary safety protective equipment.

[0046] Step 5: Start cutting: Based on the cutting position, use the cutting equipment to perform automatic walking cutting operation, control the cutting direction and speed, and ensure that the cutting lines are straight and accurate.

[0047] In order to enable the two drive seats 4 to move horizontally along the edge line of the steel box girder 1, the horizontal walking mechanism 5 includes a T-shaped fixed shaft 51. The top of the T-shaped fixed shaft 51 is fixedly installed to the bottom of the drive seat 4. Both ends of the T-shaped fixed shaft 51 are rotatably connected to the walking wheels 52 through bearings. The surfaces of the multiple walking wheels 52 are slidably inserted into the top surface of the steel box girder 1.

[0048] Specifically, when the cutting position needs to be adjusted after or before cutting, the cutting equipment is controlled to move on the surface of the steel box girder 1 to determine the cutting position, and after cutting, it moves to change to other cutting positions. This allows for the universal cutting effect of multiple steel box girders 1 above the bridge. During the movement, the traveling wheels 52 roll on the surface of the steel box girder 1 to drive the movement and adjustment.

[0049] To achieve the circular walking and cutting action of the cutting mechanism 9, the circular walking mechanism 6 includes a ring rack 61. The surface of the ring rack 61 is fixedly installed on the surface of the drive seat 4. The surface of the drive seat 4 is also fixedly installed with a ring guide rail 62. The ring guide rail 62 is located on one side of the ring rack 61. A slider 63 is slidably inserted into the surface of the ring guide rail 62. A drive motor 64 is fixedly installed on one side of the slider 63. The output shaft of the drive motor 64 is fixedly installed with a gear shaft 65 through a coupling. A gear 66 is fixedly installed at one end of the gear shaft 65. The teeth of the gear 66 mesh with the tooth grooves of the ring rack 61.

[0050] Specifically, when cutting the side of the steel box girder 1, the cutting mechanism 9 is controlled by the annular walking mechanism 6 to follow the shape of the side surface of the steel box girder 1 for assisted walking and cutting. During operation, the drive motor 64 drives the gear shaft 65 to rotate, thereby driving the gear 66 to rotate. When the gear 66 meshes with the annular rack 61, the gear 66 rolls on the surface of the annular rack 61, driving the slider 63 to slide on the surface of the annular guide rail 62. The slider 63 and the annular guide rail 62 are used to limit the movement.

[0051] To enable the wireless connection and power supply of the cutting mechanism 9, the wireless connection conductive mechanism 7 includes an annular conductive ring 71. The surface of the annular conductive ring 71 is fixedly installed to the surface of the drive seat 4 through an insulating pad. The annular conductive ring 71 is located in the middle of the annular guide rail 62 and the annular rack 61. A connecting seat 72 is also fixedly installed on one side surface of the slider 63. A carbon brush 73 is fixedly installed on the surface of the connecting seat 72. The conductive end of the carbon brush 73 is electrically connected to the conductive surface of the annular conductive ring 71. The carbon brush 73 is electrically connected to the drive motor 64.

[0052] Specifically, in order to control the power supply operation of the drive motor 64 and avoid the entanglement damage caused by wired connection, a wireless connection conductive mechanism 7 is set up. The carbon brush 73 and the annular conductive ring 71 are slidably engaged to make them electrically connected, forming a sliding power supply wireless connection, thus avoiding the entanglement damage caused by wired power supply.

[0053] To achieve the cutting action at the temporary welding position of the steel box girder 1, the cutting mechanism 9 includes an electric telescopic rod 91, which is installed at the bottom of the slider 63. A connecting plate 92 is fixedly installed at the telescopic bottom end of the electric telescopic rod 91. A cutting gun 93 is fixedly installed at one end of the connecting plate 92. The spray end of the cutting gun 93 corresponds to the two temporary welding ends of the steel box girder 1. A connecting air pipe 94 is fixedly installed at the other end of the cutting gun 93. The cutting gun 93 is electrically connected to the carbon brush 73.

[0054] Specifically, during the cutting operation, the electric telescopic rod 91 extends and retracts, driving the cutting gun 93 to move so that its cutting end corresponds to the cutting position. Then, the power is turned on to control the cutting gun 93 to align with the cutting position for the cutting operation. At the same time, the ring walking mechanism 6 drives the cutting mechanism 9 to move and perform the cutting operation.

[0055] In order to enable the two drive seats 4 to clamp onto the steel box girder 1 during the cutting operation, the clamping and positioning mechanism 10 includes a drive cavity 101 opened inside the drive seat 4. The clamping ends of the two drive cavities 101 are opposite each other. A connecting hole 102 is fixedly connected to one side of each of the two drive cavities 101. A piston 103 is slidably inserted into the inner wall of the drive cavity 101 through a sealing ring. A clamping rod 104 is fixedly installed at one end of the piston 103. One end of the clamping rod 104 penetrates through and extends to the outer surface of the drive seat 4 and is pressed against the surface of the steel box girder 1.

[0056] Specifically, before the cutting operation, the clamping and positioning mechanism 10 controls the two drive seats 4 on both sides of the steel box beam 1 to be clamped on the surface of the steel box beam 1, so that the cutting mechanism 9 can move and cut, and prevent the drive seats 4 from moving and causing uneven cutting. During clamping, hydraulic oil enters the drive cavity 101 to form hydraulic pressure, thereby pushing the piston 103 to move and drive the clamping rod 104 to extend outward, and squeeze it on the surface of the steel box beam 1 for clamping and positioning.

[0057] In order to allow the clamping rod 104 to automatically retract and return to its original position after being extended and clamped, a spring 105 is movably sleeved on the surface of the clamping rod 104. One end of the spring 105 is pressed against the surface of the piston 103, and the other end of the spring 105 is pressed against the inner wall of the drive chamber 101. An oil inlet pipe 106 is fixedly installed on the inner wall of the connecting hole 102.

[0058] Specifically, this is implemented by using the spring 105 to compress the clamping rod 104 while it is extending, generating a reverse thrust. After the oil pressure inside the drive chamber 101 decreases, the compression thrust of the spring 105 controls the clamping rod 104 to retract and return to the clamping state.

[0059] To achieve the ring-shaped connection between the two drive seats 4, the connecting mechanism 11 includes a locking crossbar 111. The top and bottom of the two drive seats 4 are provided with slots 112. The two ends of the locking crossbar 111 are respectively connected to the inner walls of the two opposite slots 112 by screw threads. The surface of the locking crossbar 111 is respectively fixedly mounted with a connecting guide rail 113, a connecting conductive plate 114, a connecting rack 115, and a connecting cable block 116. The two ends of the connecting guide rail 113 are respectively connected to the surfaces of the two annular guide rails 62 at both ends. The two ends of the connecting conductive plate 114 are respectively connected to the surfaces of the two annular conductive rings 71 at both ends. The two ends of the connecting rack 115 are respectively connected to the surfaces of the two annular racks 61 at both ends.

[0060] Specifically, this is implemented by connecting the two drive seats 4 at both ends through the connecting mechanism 11 to form a whole, so that it forms a ring, which facilitates the connection of the ring guide rail 62, the ring conductive ring 71 and the ring rack 61 into a circuit, so that the cutting operation can be carried out around the surface of the steel box girder 1.

[0061] To enable the cutting mechanism 9 to follow the oxygen pipeline, the pipeline cutting and routing mechanism 8 includes annular routing blocks 81. The two ends of the connecting routing blocks 116 are respectively connected to the surfaces of the two annular routing blocks 81 at both ends. The surfaces of the two annular routing blocks 81 and the two connecting routing blocks 116 are provided with routing grooves 82. The inner wall of the routing groove 82 is slidably inserted with a connecting pipe 83. One end of the connecting pipe 83 is fixedly installed with one end of the connecting air pipe 94. The other end of the connecting pipe 83 is fixedly installed with a flexible air pipe 84. One end of the locking crossbar 111 is also provided with a transition groove 85. The inner wall of the transition groove 85 is slidably inserted with the surface of the flexible air pipe 84.

[0062] Specifically, during the cutting process, the oxygen tube is connected to the cutting gun 93 and then connected to the wire guide 82 via the transition groove 85. This allows the oxygen tube to follow the cutting mechanism 9 as it moves, preventing it from getting tangled and hindering the cutting process. This enhances the cutting efficiency. After the cutting is completed, the cutting mechanism 9 moves in the opposite direction, which helps the oxygen tube exit through the transition groove 85.

[0063] Step 6: Monitor cutting quality: During the cutting process, adjust the cutting position in a timely manner by observing the pressure values ​​of multiple pressure sensors 3.

[0064] Step 7: Complete the cutting: After completing all cutting operations, turn off the cutting equipment and perform cleaning and tidying. By cutting the large-span multi-section steel beam into independent parts, the self-weight load of each part can be reduced. This helps to reduce the stress on the overall bridge structure and alleviate the load on the bridge. After being cut into sections, each independent part of the large-span multi-section steel beam can more flexibly adapt to earthquakes and temperature deformation. When earthquakes or temperature changes occur, each independent part can move and deform relatively freely, reducing stress concentration and damage risk to the overall structure. Through section cutting, stress concentration and fatigue damage to the bridge structure can be reduced, extending the service life of the overall bridge.

[0065] Cutting operation working principle: Before cutting, the horizontal walking mechanism 5 is used to control the drive seat 4 to move on the surface of the steel box girder 1 to adjust the cutting position. After the cutting position is confirmed, the clamping and positioning mechanism 10 is used to control the clamping rod 104 to extend outward and squeeze the surface of the steel box girder 1 for positioning and fixing.

[0066] After installation and positioning, the circular walking mechanism 6 is controlled to move, driving the cutting mechanism 9 to move. At the same time, the cutting mechanism 9 starts to cut the temporary welding position. During cutting, the cutting position will generate extrusion pressure. The pressure sensor 3 monitors the pressure and drives the circular walking mechanism 6 to move to the cutting position to perform the cutting operation. After the cutting is completed, the steel box girder 1 separates, and the circular walking mechanism 6 is controlled to move in the opposite direction to reset the initial state, contact the clamping and positioning mechanism 10, remove the connecting structure, and drive the horizontal walking mechanism 5 to move to the next cutting position. The connecting mechanism 11 is then installed to continue the cutting operation.

[0067] This invention utilizes a cutting mechanism 9 to automatically perform a walking and cutting operation on the temporarily welded parts of the steel box girder 1 after the jacking construction. During the cutting process, a pressure sensor 3 monitors the cutting pressure in real time and automatically adjusts the cutting position. The cutting equipment automatically walks and cuts around the surface of the steel box girder 1, which enhances the cutting efficiency and avoids the slow cutting efficiency and personnel injury caused by sparks during the cutting process, which are all done manually by hand.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for controlling the split cutting of large-span multi-section steel beams, characterized in that: The following steps are included: Step 1, preparation: After the steel box girder (1) is pushed to the pier (2) above the construction position by the jacking mechanism, the steel box girder (1) is first lifted by the jacking mechanism to form a cutting gap above the pier (2), and then the cutting equipment is moved to the cutting position to connect and form a whole. It is checked that it is in normal working condition. During the cutting, the oxygen cutting mechanism is used to perform the cutting operation and the cutting area is cleaned. The cutting device includes a drive base (4), and two drive bases (4) are symmetrically arranged about the axis of the steel box girder (1). The inner wall of the drive base (4) is respectively provided with a horizontal walking mechanism (5), a ring walking mechanism (6), a wireless connection conductive mechanism (7), a cutting pipe wiring mechanism (8) and a cutting mechanism (9). The drive base (4) is also provided with a clamping and positioning mechanism (10). The top and bottom of the two drive bases (4) are provided with a connecting mechanism (11). The clamping and positioning mechanism (10) includes a drive cavity (101) opened inside the drive seat (4). The clamping ends of the two drive cavities (101) are opposite each other. A connecting hole (102) is fixedly connected to one side of each of the two drive cavities (101). A piston (103) is slidably inserted into the inner wall of the drive cavity (101) through a sealing ring. A clamping rod (104) is fixedly installed at one end of the piston (103). One end of the clamping rod (104) penetrates and extends to the outer surface of the drive seat (4) and is pressed against the surface of the steel box beam (1). A spring (105) is also movably sleeved on the surface of the clamping rod (104). One end of the spring (105) is pressed against the surface of the piston (103), and the other end of the spring (105) is pressed against the inner wall of the drive cavity (101). An oil inlet pipe (106) is fixedly installed on the inner wall of the connecting hole (102). Step 2: Determine the cutting position: Before the jacking construction of the steel box girder (1), take the pressure sensor (3) and install it on the end face of the connection of the steel box girder (1). Then, temporarily weld the whole through the connector. During the cutting, analyze the initial cutting position by the pressure state detected by the pressure sensor (3) and mark the position to be cut on the steel box girder (1). Step 3: Set cutting parameters: Based on the properties and requirements of the material of the steel box girder (1), set the corresponding cutting parameters, including cutting speed and cutting depth. Step 4, Safety Measures: Before performing the cutting operation, ensure that personnel in the vicinity leave the cutting area and wear necessary safety protective equipment; Step 5: Start cutting: Based on the cutting position, use the cutting equipment to perform automatic walking cutting operation, control the cutting direction and speed, and ensure that the cutting lines are straight and accurate; Step 6: Monitor cutting quality: During the cutting process, adjust the cutting position in a timely manner by observing the pressure values ​​of multiple pressure sensors (3); Step 7: Complete the cutting: After completing all cutting operations, turn off the cutting equipment and perform cleaning and tidying.

2. The method for controlling the segmented cutting of a large-span multi-section steel beam according to claim 1, characterized in that: The horizontal walking mechanism (5) includes a T-shaped fixed shaft (51), the top of which is fixedly installed with the bottom of the drive seat (4). Both ends of the T-shaped fixed shaft (51) are rotatably connected to walking wheels (52) through bearings. The surfaces of the multiple walking wheels (52) are slidably inserted into the top surface of the steel box girder (1).

3. The method for controlling the segmented cutting of a large-span multi-section steel beam according to claim 1, characterized in that: The annular walking mechanism (6) includes an annular rack (61), the surface of which is fixedly mounted to the surface of the drive seat (4). An annular guide rail (62) is also fixedly mounted on the surface of the drive seat (4). The annular guide rail (62) is located on one side of the annular rack (61). A slider (63) is slidably inserted into the surface of the annular guide rail (62). A drive motor (64) is fixedly mounted on one side of the slider (63). A gear shaft (65) is fixedly mounted on the output shaft of the drive motor (64) through a coupling. A gear (66) is fixedly mounted on one end of the gear shaft (65). The teeth of the gear (66) mesh with the tooth grooves of the annular rack (61).

4. The method for controlling the segmented cutting of a large-span multi-section steel beam according to claim 3, characterized in that: The wireless connection conductive mechanism (7) includes an annular conductive ring (71). The surface of the annular conductive ring (71) is fixedly installed to the surface of the drive seat (4) through an insulating pad. The annular conductive ring (71) is located in the middle of the annular guide rail (62) and the annular rack (61). A connecting seat (72) is also fixedly installed on one side surface of the slider (63). A carbon brush (73) is fixedly installed on the surface of the connecting seat (72). The conductive end of the carbon brush (73) is electrically connected to the conductive surface of the annular conductive ring (71). The carbon brush (73) is electrically connected to the drive motor (64).

5. The method for controlling the split cutting of a large-span multi-section steel beam according to claim 4, characterized in that: The cutting mechanism (9) includes an electric telescopic rod (91), which is installed at the bottom of the slider (63). A connecting plate (92) is fixedly installed at the telescopic bottom end of the electric telescopic rod (91). A cutting gun (93) is fixedly installed at one end of the connecting plate (92). The spray end of the cutting gun (93) corresponds to the temporary welding end of the two steel box beams (1). A connecting air pipe (94) is fixedly installed at the other end of the cutting gun (93). The cutting gun (93) is electrically connected to the carbon brush (73).

6. The method for controlling the segmented cutting of a large-span multi-section steel beam according to claim 5, characterized in that: The connecting mechanism (11) includes a snap-fit ​​crossbar (111). The top and bottom of the two drive seats (4) are provided with slots (112). The two ends of the snap-fit ​​crossbar (111) are respectively connected to the inner walls of the two opposite slots (112) by screw threads. The surface of the snap-fit ​​crossbar (111) is respectively fixedly installed with a connecting guide rail (113), a connecting conductive plate (114), a connecting rack (115) and a connecting cable block (116). The two ends of the connecting guide rail (113) are respectively connected to the surface of the two annular guide rails (62) at both ends. The two ends of the connecting conductive plate (114) are respectively connected to the surface of the two annular conductive rings (71) at both ends. The two ends of the connecting rack (115) are respectively connected to the surface of the two annular racks (61) at both ends.

7. The method for controlling the segmented cutting of a large-span multi-section steel beam according to claim 6, characterized in that: The cutting pipe routing mechanism (8) includes annular routing blocks (81). The two ends of the connecting routing blocks (116) are respectively connected to the surfaces of the two annular routing blocks (81) at both ends. The surfaces of the two annular routing blocks (81) and the two connecting routing blocks (116) are provided with routing grooves (82). The inner wall of the routing groove (82) is slidably inserted with a connecting pipe (83). One end of the connecting pipe (83) is fixedly installed with one end of the connecting air pipe (94). The other end of the connecting pipe (83) is fixedly installed with a flexible air pipe (84). One end of the locking crossbar (111) is also provided with a transition groove (85). The inner wall of the transition groove (85) is slidably inserted with the surface of the flexible air pipe (84).

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