A construction method for jacking and pushing a steel box girder with limited position and guiding

Abstract

The present invention discloses a construction method for jacking and pushing a steel box girder with limited position and guiding, which includes the steps of: 1. Installing a jacking and pushing construction device for the steel box girder; 2. Adjusting the jacking height of the steel box girder; 3. Limited position adjustment during the jacking process of the steel box girder; 4. Guiding adjustment during the jacking process of the steel box girder. The present invention designs a V-shaped rod and an adjusting device, which increases the applicability during the use of the device. By designing a jacking and pushing device, it prevents the steel box girder from moving when it is jacked up, thus affecting the accuracy during the installation of the steel box girder. At the same time, it increases the applicability during the use of the device, effectively solving the problems of poor applicability during the use of the device and poor accuracy during the installation of the steel box girder.

Description

Technical Field

[0001] The invention belongs to the technical field of incremental launching construction of steel box girders, and particularly relates to a construction method for incremental launching of steel box girders with limit guiding. Background Technique

[0002] Steel box girders are generally used in the main structures of buildings and bridges, mainly playing the role of main load-bearing. In the continuous construction and development of urban municipal bridges, the incremental launching construction technology is widely used in various bridge constructions due to its advantages of simple construction, low noise, stable construction, and guaranteed construction quality. In the incremental launching construction of bridges, in order to ensure that the bridge advances along the predetermined incremental launching route, a guiding device needs to be set to guide the advancing trajectory of the bridge. When the main girder deviates laterally from the incremental launching route greatly, a limiting device is needed to make the bridge return to the predetermined incremental launching route.

[0003] Chinese patent document CN218757041U discloses a limit guiding device for incremental launching construction of steel box girders, which relates to the technical field of incremental launching construction of steel box girders. It includes a bottom plate, a support rod and a telescopic oil cylinder are fixed on the upper end of the bottom plate, a telescopic rod is telescopically connected to the upper end of the telescopic oil cylinder, a linkage rod and a rod body are rotatably connected to the surface of the telescopic rod, and a fixing plate is fixed on the upper end of the support rod. This invention changes the height of the limit guiding rod through the displacement groove, so that the rotating ball does not rub against the surface of the steel beam box. At the same time, the rotating direction of the rotating ball is changed through the rotating motor, so that the rotating ball can play the roles of both limiting and guiding. The linkage rod limits the position of the limit guiding rod to ensure the stable support of the limit guiding rod.

[0004] When this device is in use, it cannot adjust the jacking stroke according to different working scenarios, resulting in poor applicability. In addition, during the process of jacking up the steel box girder, it cannot limit the steel box girder, resulting in poor accuracy during the installation of the steel box girder, and it cannot adjust for different incremental launching directions, resulting in poor applicability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a construction method for incremental launching of steel box girders with limit guiding in view of the above-mentioned deficiencies in the prior art. By designing a V-shaped rod and an adjusting device, the applicability during the use of the device is increased. By designing an incremental launching device, it is prevented that the steel box girder moves when it is jacked up, thus affecting the accuracy during the installation of the steel box girder. At the same time, the applicability during the use of the device is increased, effectively solving the problems of poor applicability during the use of the device and poor accuracy during the installation of the steel box girder, and facilitating popularization and use.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a construction method for incremental launching of steel box girders with limit guiding, characterized in that the method includes the following steps:

[0007] Step 1. Install the incremental launching construction device for the steel box girder: Install multiple incremental launching construction devices at the bottom of the steel box girder. The incremental launching construction device includes a device box body. A stepping motor is provided at the front end of the device box body. A first worm is provided at the output end of the stepping motor. At the front and rear parts on the left side of the inner cavity of the device box body, a first rotating shaft is provided respectively. On the front side of the outer surface of the first rotating shaft at the front part, a first worm gear adapted to the first worm is provided; At one end of the two first rotating shafts close to each other, a first mounting plate is provided. On one side of one end of the two first mounting plates close to each other and away from the center of the first rotating shaft, a first connecting shaft is provided. A V-shaped rod is provided on the outer surface of the first connecting shaft. The left and right ends of the V-shaped rod are respectively provided with a first rotating rod and an adjusting device. A top pushing device is provided at the upper end of the first rotating rod;

[0008] The top pushing device includes an installation pipe. A limiting groove adapted to the installation pipe is opened at the upper end of the device box body. Two supporting blocks are provided at the lower end of the installation pipe. A second rotating shaft is provided between the two supporting blocks. In the middle of the outer surface of the second rotating shaft, a gear set is provided, and the second rotating shaft is connected to the first rotating rod; On the bottom surface of the inner cavity of the installation pipe, a second worm is provided. On the side of the bottom surface of the inner cavity of the installation pipe away from the center, a second worm gear adapted to the second worm is provided. A first meshing gear is provided at the upper end of the second worm gear. In the middle of the inner cavity of the installation pipe, a support plate is provided. A limiting device is provided at the upper end of the support plate;

[0009] The limiting device includes a reciprocating screw. A second meshing gear meshing with the first meshing gear is provided at the lower end of the support plate. A compound nut is provided on the outer surface of the reciprocating screw. A second mounting plate is provided on the outer surface of the compound nut. A first meshing tooth ring is provided at the upper end of the second mounting plate. A second meshing tooth ring is provided at the upper end of the first meshing tooth ring;

[0010] Two groups of guiding mechanisms are provided at the upper end of the second mounting plate. Two guiding rods are symmetrically provided at the upper end of the support plate. Two third meshing gears adapted to the guiding rods are provided at the upper end of the second mounting plate. The two third meshing gears are respectively meshed with the first meshing tooth ring and the second meshing tooth ring;

[0011] A spiral rib is provided on the upper part of the outer surface of the guiding rod. A limiting block adapted to the spiral rib is provided on the lower part of the outer surface of the guiding rod. A groove adapted to the spiral rib and the limiting block is opened at the upper end of the third meshing gear;

[0012] The number of each group of guiding mechanisms is two, and the guiding mechanisms in the same group and those in the other group are cross-distributed. The guiding mechanism includes a fourth meshing gear. The fourth meshing gears in different groups are respectively meshed with the first meshing tooth ring and the second meshing tooth ring. A third mounting plate is provided at the upper end of the fourth meshing gear. Two support rods are provided at the upper end of the third mounting plate. A guiding wheel is provided jointly between the two support rods;

[0013] Step 2. Adjust the jacking height of the steel box girder: Start the stepping motor. The stepping motor drives the first rotating shaft to rotate through the connection between the first worm and the first worm gear. Through the connection between the first connecting shaft, the V-shaped rod, and the first rotating rod, the jacking device makes reciprocating up and down movements, so as to adjust the jacking height of the steel box girder.

[0014] Step 3. Limit adjustment during the jacking process of the steel box girder: The first meshing gear ring and the second meshing gear ring cooperate with each other through the guiding mechanism and the third meshing gear adapted to them, so as to control the inclination angle of the guiding mechanism. When the inclination directions of the two groups of guiding mechanisms are different, the jacking direction of the steel box girder can be limited.

[0015] When the third meshing gear is adapted to the spiral rib, the vertical planes of the guide wheels in different groups are perpendicular to each other, so that the steel box girder will not move when moving up or down.

[0016] Step 4. Guide adjustment during the jacking process of the steel box girder: The first meshing gear ring and the second meshing gear ring cooperate with each other through the guiding mechanism and the third meshing gear adapted to them, so as to control the inclination angle of the guiding mechanism. When the inclination directions of multiple guiding mechanisms are the same, the steel box girder can be guided.

[0017] When the third meshing gear cooperates with the spiral rib adapted to it, it drives the first meshing gear ring or the second meshing gear ring adapted to it to rotate. The first meshing gear ring and the second meshing gear ring cooperate through the fourth meshing gear meshing with them, so as to drive a group of guiding mechanisms adapted to them to rotate. When the limiting device moves to the uppermost position, the vertical planes of multiple guide wheels are parallel to each other, so that the steel box girder can be pushed.

[0018] For the above-mentioned construction method for jacking, limiting, and guiding a steel box girder, it is characterized in that: Support legs are provided at the four corners of the lower end of the device box body.

[0019] For the above-mentioned construction method for jacking, limiting, and guiding a steel box girder, it is characterized in that: The adjusting device includes a third rotating shaft, and the third rotating shaft penetrates through the support leg. A control handle is provided at the front end of the third rotating shaft, and the control handle is located outside the device box body. A fixed clamp is provided at the front part of the outer surface of the third rotating shaft. An eccentric disc is provided in the middle of the outer surface of the third rotating shaft. The eccentric disc and the third rotating shaft are non-concentric. A connecting rod is provided on the outer surface of the eccentric disc, and the connecting rod is connected to the side of the V-shaped rod away from the first rotating rod.

[0020] The above-mentioned construction method for jacking and guiding a steel box girder with limited position is characterized in that: in step two, when adjusting the jacking height of the steel box girder, first rotate the control bolt of the fixed clamp so that the positional relationship between the connecting rod and the eccentric disc can be adjusted. Rotate the control handle according to the height of the steel box girder to be jacked. The eccentric disc and the third rotating shaft are non-concentric shafts, so that the extreme value of the distance between the connecting rod and the first rotating shaft can be adjusted. During the construction process, it cooperates with the V-shaped rod, so that the up-and-down sliding stroke of the jacking device can be adjusted.

[0021] 1. The present invention adopts the design of cooperating the V-shaped rod with the adjusting device. Through the mutual cooperation of the first worm gear and the first worm, it is used to drive the first rotating shaft to rotate. And the design of the worm gear and worm is adopted to prevent the first rotating shaft from driving the first worm to rotate when the device is in use, so that the jacking device cannot lift the steel box girder, thus affecting the stability of the device during use. Through the eccentric design of the eccentric disc, the extreme value of the distance between the connecting rod and the first rotating shaft can be adjusted. Further, it cooperates with the V-shaped rod, so that the up-and-down sliding stroke of the jacking device can be adjusted, enabling the device to be applicable to the jacking operations of steel box girders in different working environments and increasing the applicability of the device during use.

[0022] 2. The jacking device of the present invention can move up and down through the guiding mechanism, thus playing a role in limiting and guiding the steel box girder. Through the mutual cooperation of the first meshing tooth ring, the second meshing tooth ring, the guiding mechanism adapted thereto, and the third meshing gear, the inclination angle of the guiding mechanism can be controlled. Further, when the inclination directions of multiple guiding mechanisms are the same, the steel box girder can be guided. When the inclination directions of the two groups of guiding mechanisms are different, the jacking direction of the steel box girder can be limited, so that the steel box girder will not move when it is jacked up to a non-uppermost position, preventing the steel box girder from moving when it is jacked up, thus affecting the accuracy during the installation of the steel box girder. The design of cooperating the guiding rod with the third meshing gear enables the device to adjust the angle when multiple guiding mechanisms are inclined during use, enabling the device to be applicable to steel box girders with different jacking directions and increasing the applicability of the device during use.

[0023] The technical solutions of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall structure of the jacking construction device of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the device box of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the adjusting device of the present invention;

[0027] Figure 4 Exploded view of the adjusting device of the present invention cooperating with the V-shaped rod;

[0028] Figure 5 Structural schematic diagram of the pushing device of the present invention;

[0029] Figure 6 Structural schematic diagram of the pushing device of the present invention cooperating with the first rotating rod;

[0030] Figure 7 Structural schematic diagram of the limiting device of the present invention;

[0031] Figure 8 Structural schematic diagram of the guiding mechanism of the present invention;

[0032] Figure 9 Structural schematic diagram of the guiding rod of the present invention cooperating with the third meshing gear;

[0033] Figure 10 Structural schematic diagram of the pushing device when the vertical parts of the four guiding wheels of the present invention are parallel to each other;

[0034] Figure 11 For the present invention Figure 6 Enlarged view of part A;

[0035] Figure 12 For the present invention Figure 10 Enlarged view of part B.

[0036] Figure 13 Method flow block diagram of the present invention.

[0037] Explanation of reference numerals:

[0038] 1 - Device box body; 2 - Pushing device; 3 - Adjusting device;

[0039] 11 - Support leg; 12 - Stepper motor; 13 - First worm;

[0040] 14 - First rotating shaft; 15 - First worm gear; 16 - First mounting plate;

[0041] 17 - First connecting shaft; 18 - V-shaped rod; 19 - First rotating rod;

[0042] 21 - Installation pipe; 22 - Support block; 23 - Second rotating shaft;

[0043] 24 - Gear set; 25 - Second worm; 26 - Second worm gear;

[0044] 27 - First meshing gear; 28 - Support plate; 29 - Limiting device;

[0045] 291 - Reciprocating screw; 292 - Second meshing gear; 293 - Reciprocating nut;

[0046] 294 - Second mounting plate; 295 - First meshing tooth ring; 296 - Second meshing tooth ring;

[0047] 297 - Guide mechanism; 2971 - Fourth meshing gear; 2972 - Third mounting plate;

[0048] 2973 - Support rod; 2974 - Guide wheel; 298 - Guide rod;

[0049] 2981 - Spiral rib; 2982 - Limit block; 299 - Third meshing gear;

[0050] 31 - Third rotating shaft; 32 - Control handle; 33 - Eccentric disc;

[0051] 34 - Connecting rod; 35 - Fixed clamp. Detailed implementation manner

[0052] As Figures 1 to 13 shown, a steel box girder limit guiding jacking construction method of the present invention includes the following steps:

[0053] Step 1: Install the steel box girder jacking construction device: Install a plurality of jacking construction devices at the bottom of the steel box girder. The jacking construction device includes a device box body 1. A stepping motor 12 is provided at the front end of the device box body 1. A first worm 13 is provided at the output end of the stepping motor 12. Both the front and rear parts on the left side of the inner cavity of the device box body 1 are provided with a first rotating shaft 14. A first worm gear 15 adapted to the first worm 13 is provided on the front side of the outer surface of the first rotating shaft 14 located in the front part; One end of the two first rotating shafts 14 close to each other is provided with a first mounting plate 16. On one side of one end of the two first mounting plates 16 close to each other away from the center of the first rotating shaft 14, a first connecting shaft 17 is provided. A V-shaped rod 18 is provided on the outer surface of the first connecting shaft 17. The left and right ends of the V-shaped rod 18 are respectively provided with a first rotating rod 19 and an adjusting device 3. A jacking device 2 is provided at the upper end of the first rotating rod 19;

[0054] The pushing device 2 includes an installation pipe 21. A limiting groove adapted to the installation pipe 21 is provided at the upper end of the device box body 1. Two support blocks 22 are provided at the lower end of the installation pipe 21. A second rotating shaft 23 is provided between the two support blocks 22. A gear set 24 is provided in the middle of the outer surface of the second rotating shaft 23, and the second rotating shaft 23 is connected to the first rotating rod 19. A second worm 25 is provided on the bottom surface of the inner cavity of the installation pipe 21. A second worm gear 26 adapted to the second worm 25 is provided on one side of the bottom surface of the inner cavity of the installation pipe 21 away from the center. A first meshing gear 27 is provided at the upper end of the second worm gear 26. A support plate 28 is provided in the middle of the inner cavity of the installation pipe 21. A limiting device 29 is provided at the upper end of the support plate 28.

[0055] The limiting device 29 includes a reciprocating screw 291. A second meshing gear 292 meshing with the first meshing gear 27 is provided at the lower end of the support plate 28. A compound nut 293 is provided on the outer surface of the reciprocating screw 291. A second mounting plate 294 is provided on the outer surface of the reciprocating nut 293. A first meshing tooth ring 295 is provided at the upper end of the second mounting plate 294. A second meshing tooth ring 296 is provided at the upper end of the first meshing tooth ring 295.

[0056] Two sets of guiding mechanisms 297 are provided at the upper end of the second mounting plate 294. Two guiding rods 298 are symmetrically provided at the upper end of the support plate 28. Two third meshing gears 299 adapted to the guiding rods 298 are provided at the upper end of the second mounting plate 294. The two third meshing gears 299 are respectively meshed with the first meshing tooth ring 295 and the second meshing tooth ring 296.

[0057] A spiral rib 2981 is provided on the upper part of the outer surface of the guiding rod 298. A limiting block 2982 adapted to the spiral rib 2981 is provided on the lower part of the outer surface of the guiding rod 298. Grooves adapted to the spiral rib 2981 and the limiting block 2982 are provided at the upper end of the third meshing gear 299.

[0058] The number of each set of guiding mechanisms 297 is two, and the guiding mechanisms 297 in the same set are cross-distributed with the guiding mechanisms 297 in the other set. The guiding mechanism 297 includes a fourth meshing gear 2971. The fourth meshing gears 2971 in different sets are respectively meshed with the first meshing tooth ring 295 and the second meshing tooth ring 296. A third mounting plate 2972 is provided at the upper end of the fourth meshing gear 2971. Two support rods 2973 are provided at the upper end of the third mounting plate 2972. A guiding wheel 2974 is jointly provided between the two support rods 2973.

[0059] Step 2: Adjust the jacking height of the steel box girder: Start the stepping motor 12. The stepping motor 12 drives the first rotating shaft 14 to rotate through the connection relationship between the first worm 13 and the first worm gear 15. The pushing device 2 is driven to perform reciprocating up and down movement through the connection relationship between the first connecting shaft 17, the V-shaped rod 18 and the first rotating rod 19, so as to adjust the jacking height of the steel box girder.

[0060] Step 3. Limit adjustment during the jacking of the steel box girder: The first meshing tooth ring 295 and the second meshing tooth ring 296 cooperate with each other through the guiding mechanism 297 and the third meshing gear 299 adapted thereto, so as to control the inclination angle of the guiding mechanism 297. When the inclination directions of the two groups of guiding mechanisms 297 are different, the jacking direction of the steel box girder can be limited.

[0061] When the third meshing gear 299 is adapted to the spiral rib 2981, the vertical planes of the guiding wheels 2974 in different groups are perpendicular to each other, so that the steel box girder will not move when moving upward or downward.

[0062] Step 4. Guiding adjustment during the jacking of the steel box girder: The first meshing tooth ring 295 and the second meshing tooth ring 296 cooperate with each other through the guiding mechanism 297 and the third meshing gear 299 adapted thereto, so as to control the inclination angle of the guiding mechanism 297. When the inclination directions of the multiple guiding mechanisms 297 are the same, the steel box girder can be guided.

[0063] When the third meshing gear 299 cooperates with the spiral rib 2981 adapted thereto, it drives the first meshing tooth ring 295 or the second meshing tooth ring 296 adapted thereto to rotate. The first meshing tooth ring 295 and the second meshing tooth ring 296 cooperate through the fourth meshing gear 2971 meshing therewith, so as to drive a group of guiding mechanisms 297 adapted thereto to rotate. When the limiting device 29 moves to the uppermost position, the vertical planes of the multiple guiding wheels 2974 are parallel to each other, so that the steel box girder can be pushed.

[0064] In this embodiment, support legs 11 are provided at the four corners of the lower end of the device box body 1.

[0065] In this embodiment, the adjusting device 3 includes a third rotating shaft 31, and the third rotating shaft 31 penetrates through the support leg 11. A control handle 32 is provided at the front end of the third rotating shaft 31, and the control handle 32 is located outside the device box body 1. A fixed clamp 35 is provided on the outer surface of the front part of the third rotating shaft 31. An eccentric disc 33 is provided in the middle of the outer surface of the third rotating shaft 31. The eccentric disc 33 and the third rotating shaft 31 are non-concentric. A connecting rod 34 is provided on the outer surface of the eccentric disc 33, and the connecting rod 34 is connected to the side of the V-shaped rod 18 away from the first rotating rod 19.

[0066] In this embodiment, in step two, when adjusting the jacking height of the steel box girder, first rotate the control bolt of the fixed clamp 35 so that the positional relationship between the connecting rod 34 and the eccentric disc 33 can be adjusted. Rotate the control handle 32 according to the required height of the jacked steel box girder. The eccentric disc 33 and the third rotating shaft 31 are non-concentric shafts, so that the extreme value of the distance between the connecting rod 34 and the first rotating shaft 14 can be adjusted. During the construction process, it cooperates with the V-shaped rod 18, so that the up and down sliding stroke of the jacking device 2 can be adjusted.

[0067] It should be noted that the design of the V-shaped rod cooperating with the adjusting device is adopted. The first worm gear and the first worm cooperate with each other to drive the first rotating shaft to rotate. And the design of the worm gear and worm is adopted to prevent the first rotating shaft from driving the first worm to rotate during the use of the device, so that the jacking device cannot lift the steel box girder, thus affecting the stability during the use of the device. Through the eccentric design of the eccentric disc, the extreme value of the distance between the connecting rod and the first rotating shaft can be adjusted. Further, it cooperates with the V-shaped rod, so that the up and down sliding stroke of the jacking device can be adjusted, making the device applicable to the jacking operations of steel box girders in different working environments and increasing the applicability during the use of the device.

[0068] The jacking device can move up and down through the guiding mechanism, thus playing a role in limiting and guiding the steel box girder. Through the cooperation of the first meshing tooth ring, the second meshing tooth ring, the guiding mechanism adapted to them, and the third meshing gear, the inclination angle of the guiding mechanism can be controlled. Further, when the inclination directions of multiple guiding mechanisms are the same, the steel box girder can be guided. When the inclination directions of the two groups of guiding mechanisms are different, the jacking direction of the steel box girder can be limited, so that the steel box girder will not move when it is jacked up to a non-uppermost position, preventing the steel box girder from moving when it is jacked up, thus affecting the accuracy during the installation of the steel box girder. The design of the guiding rod cooperating with the third meshing gear is adopted, so that the device can adjust the inclination angle of multiple guiding mechanisms during the use, making the device applicable to steel box girders with different jacking directions and increasing the applicability during the use of the device.

[0069] The above are only the preferred embodiments of the present invention and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A construction method for jacking and pushing a steel box girder with limited position and guiding, characterized in that, The method includes the following steps: Step 1. Install the incremental launching construction device for the steel box girder: Install a plurality of incremental launching construction devices at the bottom of the steel box girder. The incremental launching construction device includes a device box body (1). A stepping motor (12) is provided at the front end of the device box body (1). A first worm (13) is provided at the output end of the stepping motor (12). Both the front and rear parts on the left side of the inner cavity of the device box body (1) are provided with a first rotating shaft (14). A first worm gear (15) adapted to the first worm (13) is provided on the front side of the outer surface of the first rotating shaft (14) located in the front part. One end of each of the two first rotating shafts (14) close to each other is provided with a first mounting plate (16). On one side of one end of the two first mounting plates (16) close to each other away from the center of the first rotating shaft (14), a first connecting shaft (17) is provided. A V-shaped rod (18) is provided on the outer surface of the first connecting shaft (17). The left and right ends of the V-shaped rod (18) are respectively provided with a first rotating rod (19) and an adjusting device (3). A jacking device (2) is provided at the upper end of the first rotating rod (19). The jacking device (2) includes an installation pipe (21). A limiting groove adapted to the installation pipe (21) is provided at the upper end of the device box body (1). Two support blocks (22) are provided at the lower end of the installation pipe (21). A second rotating shaft (23) is provided between the two support blocks (22). A gear set (24) is provided in the middle of the outer surface of the second rotating shaft (23), and the second rotating shaft (23) is connected to the first rotating rod (19). A second worm (25) is provided on the bottom surface of the inner cavity of the installation pipe (21). A second worm gear (26) adapted to the second worm (25) is provided on one side of the bottom surface of the inner cavity of the installation pipe (21) away from the center. A first meshing gear (27) is provided at the upper end of the second worm gear (26). A support plate (28) is provided in the middle of the inner cavity of the installation pipe (21). A limiting device (29) is provided at the upper end of the support plate (28). The limiting device (29) includes a reciprocating screw rod (291). A second meshing gear (292) meshing with the first meshing gear (27) is provided at the lower end of the support plate (28). A compound nut (293) is provided on the outer surface of the reciprocating screw rod (291). A second mounting plate (294) is provided on the outer surface of the reciprocating nut (293). A first meshing tooth ring (295) is provided at the upper end of the second mounting plate (294). A second meshing tooth ring (296) is provided at the upper end of the first meshing tooth ring (295). Two groups of guiding mechanisms (297) are provided at the upper end of the second mounting plate (294). Two guiding rods (298) are symmetrically provided at the upper end of the support plate (28). Two third meshing gears (299) adapted to the guiding rods (298) are provided at the upper end of the second mounting plate (294). The two third meshing gears (299) are respectively meshed with the first meshing tooth ring (295) and the second meshing tooth ring (296). The upper part of the outer surface of the guiding rod (298) is provided with a spiral rib (2981), and the lower part of the outer surface of the guiding rod (298) is provided with a limiting block (2982) adapted to the spiral rib (2981). A groove adapted to the spiral rib (2981) and the limiting block (2982) is opened at the upper end of the third meshing gear (299). The number of each group of guiding mechanisms (297) is two, and the guiding mechanisms (297) in the same group are cross-distributed with those in the other group. The guiding mechanism (297) includes a fourth meshing gear (2971). The fourth meshing gears (2971) in different groups are respectively meshed with the first meshing tooth ring (295) and the second meshing tooth ring (296). A third mounting plate (2972) is provided at the upper end of the fourth meshing gear (2971). Two support rods (2973) are provided at the upper end of the third mounting plate (2972). A guiding wheel (2974) is jointly provided between the two support rods (2973). Step 2: Adjust the jacking height of the steel box girder. Start the stepping motor (12). The stepping motor (12) drives the first rotating shaft (14) to rotate through the connection relationship between the first worm (13) and the first worm gear (15). Through the connection relationship between the first connecting shaft (17), the V-shaped rod (18), and the first rotating rod (19), the jacking device (2) is driven to perform reciprocating up and down movements, so as to achieve the adjustment of the jacking height of the steel box girder. Step 3: Limit adjustment during the jacking process of the steel box girder. The first meshing tooth ring (295) and the second meshing tooth ring (296) cooperate with each other through the guiding mechanism (297) and the third meshing gear (299) adapted to them, so as to control the inclination angle of the guiding mechanism (297). When the inclination directions of the guiding mechanisms (297) in the two groups are different, the jacking direction of the steel box girder can be limited. When the third meshing gear (299) is adapted to the spiral rib (2981), the vertical planes of the guiding wheels (2974) in different groups are perpendicular to each other, so that the steel box girder will not move when moving up or down. Step 4: Guide adjustment during the jacking process of the steel box girder. The first meshing tooth ring (295) and the second meshing tooth ring (296) cooperate with each other through the guiding mechanism (297) and the third meshing gear (299) adapted to them, so as to control the inclination angle of the guiding mechanism (297). When the inclination directions of the multiple guiding mechanisms (297) are the same, the steel box girder can be guided. When the third meshing gear (299) cooperates with the spiral rib (2981) adapted to it, it drives the first meshing tooth ring (295) or the second meshing tooth ring (296) adapted to it to rotate. The first meshing tooth ring (295) and the second meshing tooth ring (296) cooperate through the fourth meshing gear (2971) meshed with them, so as to drive a group of guiding mechanisms (297) adapted to them to rotate. When the limiting device (29) moves to the uppermost position, the vertical planes of the multiple guiding wheels (2974) are parallel to each other, so that the steel box girder can be pushed.

2. A steel box girder limit-guided jacking construction method according to claim 1, characterized in that: Support legs (11) are provided at the four corners of the lower end of the device box body (1).

3. A steel box girder limit-guided jacking construction method according to claim 2, characterized in that: The adjusting device (3) includes a third rotating shaft (31), and the third rotating shaft (31) penetrates through the support leg (11). A control handle (32) is provided at the front end of the third rotating shaft (31), and the control handle (32) is located outside the device box body (1). A fixed clamp (35) is provided on the front part of the outer surface of the third rotating shaft (31). An eccentric disc (33) is provided in the middle of the outer surface of the third rotating shaft (31). The eccentric disc (33) and the third rotating shaft (31) are non-concentric. A connecting rod (34) is provided on the outer surface of the eccentric disc (33), and the connecting rod (34) is connected to the side of the V-shaped rod (18) away from the first rotating rod (19).

4. A steel box girder limit-guided jacking construction method according to claim 3, characterized in that: In step two, when adjusting the jacking height of the steel box girder, first rotate the control bolt of the fixed clamp (35) so that the positional relationship between the connecting rod (34) and the eccentric disc (33) can be adjusted. Rotate the control handle (32) according to the required height for jacking the steel box girder. Since the eccentric disc (33) and the third rotating shaft (31) are non-concentric, the extreme value of the distance between the connecting rod (34) and the first rotating shaft (14) can be adjusted. During the construction process, it cooperates with the V-shaped rod (18) so that the up and down sliding stroke of the jacking device (2) can be adjusted.

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