Light guide beam and main beam quick connecting structure for large-span steel box girder bridge

Abstract

The invention provides a light guide beam and main beam quick connecting structure for a large-span steel box girder bridge, and belongs to the field of bridge engineering. The device comprises a steel box main beam and a light guide beam, a transverse supporting plate and a longitudinal supporting plate are arranged in the steel box main beam, the light guide beam comprises two I-shaped main beams and a middle connecting frame, and a plurality of lock sleeves located on the outer side of the steel box main beam are fixedly installed on the transverse supporting plate. The ends, close to the steel box main beam, of the two I-shaped main beams are each provided with a quick positioning and locking mechanism, the quick positioning and locking mechanisms are used for being matched with a lock sleeve to achieve fixed connection of the steel box main beam and the light guide beam, and the lock sleeve is provided with a plurality of L-shaped lock openings which are rotationally and symmetrically distributed. And the quick positioning and locking mechanism comprises a plurality of rotatable rotating sleeves. The light guide beam and main beam quick connecting structure for the large-span steel box girder bridge has the advantages of being accurate in positioning, efficient in connection and reliable in locking.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges. Background Technology

[0002] As transportation infrastructure extends into complex geographical environments, long-span steel box girder bridges are widely used in engineering scenarios such as river crossings, sea crossings, and mountain canyons due to their advantages of strong spanning capacity and high structural rigidity. These bridges mostly adopt cantilever assembly or cantilever casting construction techniques. The lightweight guide beam, as a core auxiliary structure, needs to be reliably connected to the main steel box girder to provide support, guidance, and load transfer functions for the cantilever end. Its connection efficiency and stability directly affect the overall construction progress, structural safety, and project cost.

[0003] However, the existing connection methods between the guide beam and the main beam have the following problems: For high-altitude operations in the cantilever construction of large-span steel box girder bridges, traditional connection methods still mainly rely on bolt tightening or on-site welding. The connection work is inefficient. Bolt tightening requires manual high-altitude repeated adjustments to align the holes and then tightening them one by one. Welding requires on-site pre-welding treatment and welding operations. The connection of a single section of guide beam and main beam is time-consuming, which seriously restricts the overall progress of cantilever construction. Moreover, both connection methods require a large amount of manual high-altitude operation. Affected by factors such as limited high-altitude working space and complex construction environment, the labor intensity of workers is high and the safety risks during operation are high. At the same time, the disassembly and assembly process is cumbersome. Bolt tightening requires disassembly one by one, and welding connection requires grinding and cleaning of the weld. This not only further reduces construction efficiency, but also easily causes collision damage to core components, making it difficult to quickly transfer them to the next construction area for reuse after disassembly, which greatly increases the investment in engineering equipment and construction costs.

[0004] Therefore, it is necessary to provide a lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges to solve the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges that is accurate in positioning, efficient in connection, and reliable in locking.

[0006] To solve the above-mentioned technical problems, the present invention provides a lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges, including a steel box girder main beam and a lightweight guide beam. The steel box girder main beam is provided with transverse support plates and longitudinal support plates. The lightweight guide beam includes two I-beam main beams and an intermediate connecting frame. Multiple locking sleeves located on the outer side of the steel box girder are fixedly installed on the transverse support plates. A quick positioning and locking mechanism is installed at one end of each of the two I-beam main beams near the steel box girder main beam. The quick positioning and locking mechanism is used to cooperate with the locking sleeves to realize the fixed connection between the steel box girder main beam and the lightweight guide beam. Multiple L-shaped locking slots are provided on the locking sleeves in a rotationally symmetrical distribution. The quick positioning and locking mechanism includes multiple rotatable rotating sleeves. Multiple locking rods in a rotationally symmetrical distribution are fixedly installed on the outer wall of the rotating sleeves. The locking rods are adapted to the L-shaped locking slots.

[0007] Preferably, the quick positioning and locking mechanism further includes multiple limiting posts, multiple gears, two first slide rails, two racks, two slide rods, a connecting top plate, and an electric push rod. Fixed plates are fixedly installed in the two web grooves of the I-beam main beam. Multiple limiting posts are respectively fixedly installed on their corresponding fixed plates. Each limiting post penetrates its corresponding locking sleeve and is movably connected to it. The end of each limiting post away from the fixed plate extends into the steel box girder. The rotating sleeve is rotatably fitted onto the limiting post. The two first slide rails are respectively fixedly installed on the I-beam main beam. On both sides of the web of the beam, two racks are slidably mounted on two first slide rails, and multiple gears are fixedly sleeved on multiple rotating sleeves. Both racks mesh with their corresponding gears. Two slide rods are slidably mounted on the top of the I-beam, and the bottom ends of both slide rods extend into the corresponding web grooves and are fixedly connected to the top ends of the corresponding racks. A connecting top plate is fixedly mounted on the top ends of the two slide rods. An electric push rod is fixedly mounted on the top of the I-beam, and the output end of the electric push rod is fixedly connected to the connecting top plate.

[0008] Furthermore, two limiting rings are fixedly sleeved on the outer wall of the limiting post, and the two limiting rings are respectively located on both sides of the rotating sleeve.

[0009] Furthermore, a flared guide groove is provided inside the lock sleeve, and the end face of the limiting post away from the fixing plate is designed with rounded corners at the connection with the outer peripheral wall.

[0010] Furthermore, a plurality of reinforcing sleeves located inside the main steel box girder are fixedly installed on the transverse support plate. The plurality of reinforcing sleeves are coaxial with the plurality of locking sleeves respectively. The limiting post passes through the reinforcing sleeve and is slidably connected to the inner wall of the reinforcing sleeve.

[0011] Furthermore, two sets of reinforcing locking mechanisms are provided inside the steel box girder. The two sets of reinforcing locking mechanisms are respectively installed on the corresponding longitudinal support plates. The reinforcing locking mechanism includes a connecting component, two locking components, and a driving component. The two locking components are detachably fixedly installed on both sides of the corresponding longitudinal support plate. The driving component is detachably fixedly installed on one side of the corresponding longitudinal support plate and is used to drive the two locking components to run. The connecting component is detachably fixedly installed on the top of the two locking components. The locking component includes multiple locking blocks. The outer wall of the limiting column is provided with a locking slot located inside the steel box girder. The locking blocks are adapted to the locking slot.

[0012] Preferably, the locking assembly further includes a first mounting plate, a second slide rail, a slide bar, and multiple mounting seats. The first mounting plate is fixedly mounted on the longitudinal support plate by bolts, the second slide rail is fixedly mounted on the first mounting plate, the slide bar is slidably mounted on the second slide rail, the multiple mounting seats are all fixedly mounted on the slide bar, and the multiple locking blocks are respectively fixedly mounted on the multiple mounting seats.

[0013] Preferably, the drive assembly includes a second mounting plate, multiple shaft seats, a lead screw, a driven block, a worm gear, a worm, and a connecting block. The second mounting plate is fixedly mounted on the longitudinal support plate by bolts. The multiple shaft seats are all fixedly mounted on the second mounting plate. The lead screw passes through and is rotatably mounted on the multiple shaft seats. The driven block is threaded onto the lead screw. The worm gear is fixedly mounted on the lead screw. The worm is rotatably mounted on the second mounting plate and meshes with the worm gear. The connecting block is fixedly mounted on the driven block, and the end of the connecting block away from the driven block is detachably fixedly connected to the corresponding slide bar.

[0014] Preferably, the connecting assembly includes two slots, a connecting plate, two L-shaped fixing blocks, two screws, and two pins. The two slots are respectively fixedly installed on the tops of the two slide bars by bolts. The connecting plate is disposed inside the two slots and has two insertion holes. The two L-shaped fixing blocks are respectively fixedly installed on the tops of the two slots. The two screws are respectively threaded onto the two L-shaped fixing blocks. The two pins are respectively disposed at the bottom ends of the two screws, and the pins are integrally formed with the screws. The bottom ends of the pins extend into the insertion holes.

[0015] Furthermore, a hexagonal block is fixedly installed at the end of the worm gear away from the slide bar, and an internal hexagonal groove is formed in the hexagonal block.

[0016] Compared with related technologies, the lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges provided by this invention has the following advantages: 1. This invention enables rapid positioning and efficient locking, significantly improving construction efficiency. Through the cooperation of the flared guide groove and the rounded corner limiting post, the lightweight guide beam and the main steel box girder are quickly aligned without repeated manual adjustments. The electric push rod drives the rack to rotate the gear, causing the locking rod to engage in the L-shaped locking slot to complete the rotational locking action. Single-segment connection time is reduced, significantly improving efficiency compared to traditional methods and helping to shorten the cantilever construction cycle of large-span steel box girder bridges.

[0017] 2. This invention employs a dual locking mechanism to ensure connection reliability. The quick-positioning locking mechanism achieves primary locking through the mechanical engagement of the rotating locking rod and the L-shaped locking jaws. The secondary locking is achieved through the engagement of the locking block and the limiting post. This dual locking mechanism can withstand the vertical loads and horizontal torques during cantilever construction, avoiding the risk of loosening under long-term dynamic loads with a single locking method, and improving structural safety redundancy.

[0018] 3. This invention incorporates a connection guide and foolproof design to reduce the risks of working at heights. The flared guide groove of the locking sleeve and the rounded corners of the limiting post can automatically correct alignment when the guide beam deviates slightly, reducing the frequency of manual adjustments at heights; the electrically driven locking action replaces traditional manual bolt tightening, reducing the safety risks and labor intensity of working at heights.

[0019] 4. The reinforcing locking mechanism installed within the steel box girder of this invention is a modular and detachable structure, enabling the reuse of the guide beam. All components of the reinforcing locking mechanism are connected by detachable bolts. After completing a single section of construction, the core components can be quickly disassembled and transferred to the connection work between the next section of guide beam and the main girder, eliminating the need for repeated processing and significantly reducing equipment investment costs. Attached Figure Description

[0020] Figure 1 A schematic diagram of the lightweight guide beam and main beam quick connection structure for a long-span steel box girder bridge provided by the present invention; Figure 2 for Figure 1 The diagram shows the structure with the steel box girder and the lightweight guide beam separated. Figure 3 for Figure 2 The diagram shows the structural schematic of the steel box girder. Figure 4 for Figure 2 The diagram shows the structure of the lightweight guide beam. Figure 5 for Figure 3 The diagram shows the structure of the lock sleeve; Figure 6 for Figure 5 The cross-sectional view of the lock sleeve shown; Figure 7 for Figure 4A schematic diagram of the rapid positioning and locking mechanism shown; Figure 8 for Figure 7 The enlarged view of part A shown; Figure 9 for Figure 8 The lock bar shown is Figure 5 The diagram shows the fitting of the lock sleeve; Figure 10 for Figure 1 The diagram shows a sectional view of a lightweight guide beam and main beam quick connection structure for a long-span steel box girder bridge. Figure 11 for Figure 10 The enlarged view of section B shown; Figure 12 for Figure 10 The diagram shows the structure of the enhanced locking mechanism; Figure 13 for Figure 12 The diagram shows the structure in which the driving component and the corresponding card slot component are separated. Figure 14 for Figure 13 The diagram shows the connection between the two card slot components; Figure 15 for Figure 14 The diagram shows an exploded view of the connecting components.

[0021] Numbering on the map: 1. Steel box main beam; 2. Lightweight guide beam; 3. Transverse support plate; 4. Longitudinal support plate; 5. Locking sleeve; 6. Fixing plate; 7. Limiting post; 8. Rotating sleeve; 9. Gear; 10. Locking rod; 11. First slide rail; 12. Rack; 13. Slide rod; 14. Connecting top plate; 15. Electric push rod; 16. Reinforcing sleeve; 17. First mounting plate; 18. Second slide rail; 19. Slide bar; 20. Mounting seat; 21. Locking block; 22. Second mounting plate; 23. Shaft seat; 24. Lead screw; 25. Driven block; 26. Worm gear; 27. Worm; 28. Connecting block; 29. ​​Groove box; 30. Connecting plate; 31. L-shaped fixing block; 32. Screw; 33. Pin; 501. L-shaped locking port; 502. Trumpet-shaped guide groove; 701. Bayonet; 3001. Insertion hole. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please refer to the following: Figures 1-15A lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges includes: a steel box girder main beam 1 and a lightweight guide beam 2. The steel box girder main beam 1 is equipped with transverse support plates 3 and longitudinal support plates 4. The lightweight guide beam 2 is a temporary structure for auxiliary cantilever construction, including two I-beam main beams and an intermediate connecting frame welded between the two I-beam main beams. Multiple locking sleeves 5 located on the outer side of the steel box girder main beam 1 are fixedly installed on the transverse support plates 3. The locking sleeves 5 are rigid ring structures used to receive the insertion and rotation locking of the locking rods 10 mentioned below. Each of the two I-beam main beams is equipped with a locking sleeve 5 at one end near the steel box girder main beam 1. The quick positioning and locking mechanism is used to cooperate with the locking sleeve 5 to achieve a fixed connection between the steel box main beam 1 and the lightweight guide beam 2. The locking sleeve 5 has multiple L-shaped locking mouths 501 that are distributed in a rotational symmetry. The L-shaped locking mouth 501 consists of a vertical insertion section and a rotating locking section. The quick positioning and locking mechanism includes multiple rotatable rotating sleeves 8. Multiple locking rods 10 that are distributed in a rotational symmetry are fixedly installed on the outer wall of the rotating sleeves 8. The locking rods 10 are adapted to the L-shaped locking mouths 501. The locking rods 10 and the L-shaped locking mouths 501 are precisely adapted. The locking action can be completed by rotating 20 to 30 degrees.

[0024] In this embodiment, the rapid positioning and locking mechanism further includes multiple limiting posts 7, multiple gears 9, two first slide rails 11, two racks 12, two slide rods 13, a connecting top plate 14, and an electric push rod 15. Fixing plates 6 are fixedly installed in the two web grooves of the I-beam main beam. Multiple limiting posts 7 are respectively fixedly installed on the corresponding fixing plates 6. The limiting posts 7 are rigid cylindrical structures, and each limiting post 7 penetrates the corresponding locking sleeve 5 and is movably connected to the corresponding locking sleeve 5. The end of the limiting post 7 away from the fixing plate 6 extends into the steel box main beam 1. The rotating sleeve 8 is rotatably sleeved on the limiting posts 7. Two limiting rings are fixedly sleeved on the outer wall of the limiting post 7, and the two limiting rings are located on both sides of the rotating sleeve 8 to prevent axial movement of the rotating sleeve 8. The two first slide rails 11 are... Two racks 12 are fixedly installed on both sides of the web of the I-beam main beam. Two racks 12 are slidably installed on two first slide rails 11 respectively. Multiple gears 9 are fixedly sleeved on multiple rotating sleeves 8 respectively. Both racks 12 mesh with the corresponding gears 9. The meshing transmission between the gears 9 and racks 12 can convert the linear motion of the racks 12 into the rotational motion of the rotating sleeves 8, thereby driving the locking rod 10 to complete the locking action. Two slide rods 13 are slidably installed on the top of the I-beam main beam. The bottom ends of the two slide rods 13 extend into the corresponding web grooves and are fixedly connected to the top ends of the corresponding racks 12. The connecting top plate 14 is fixedly installed on the top ends of the two slide rods 13. The electric push rod 15 is fixedly installed on the top of the I-beam main beam. The output end of the electric push rod 15 is fixedly connected to the connecting top plate 14.

[0025] In this embodiment, a horn-shaped guide groove 502 is provided inside the locking sleeve 5. The end face of the limiting post 7 away from the fixing plate 6 is designed with rounded corners at the connection with the outer peripheral wall. The horn-shaped guide groove 502 can guide the limiting post 7 to be inserted quickly, improving the alignment efficiency.

[0026] In this embodiment, multiple reinforcing sleeves 16 located inside the steel box girder 1 are fixedly installed on the transverse support plate 3. The multiple reinforcing sleeves 16 are coaxial with multiple locking sleeves 5 respectively. The limiting post 7 passes through the reinforcing sleeve 16 and is slidably connected to the inner wall of the reinforcing sleeve 16. The reinforcing sleeve 16 is a rigid sleeve structure and is coaxial with the locking sleeve 5, which can enhance the local bearing capacity of the transverse support plate 3 and avoid stress concentration when the limiting post 7 is inserted.

[0027] In this embodiment, two sets of reinforcing locking mechanisms are provided inside the steel box main beam 1. The two sets of reinforcing locking mechanisms are respectively installed on the corresponding longitudinal support plates 4. The reinforcing locking mechanism includes a connecting component, two locking components and a driving component. The two locking components are detachably fixed on both sides of the corresponding longitudinal support plate 4. The driving component is detachably fixed on one side of the corresponding longitudinal support plate 4 and is used to drive the two locking components to run. The connecting component is detachably fixed on the top of the two locking components. After the construction is completed, the connecting component, locking component and driving component can be removed for subsequent connection work between the guide beam and the main beam. The locking component includes multiple locking blocks 21. The outer wall of the limiting column 7 is provided with a locking slot 701 located inside the steel box main beam 1. The locking blocks 21 are adapted to the locking slot 701.

[0028] In this embodiment, the locking assembly further includes a first mounting plate 17, a second slide rail 18, a slide bar 19, and multiple mounting seats 20. The first mounting plate 17 is fixedly mounted on the longitudinal support plate 4 by bolts. The second slide rail 18 is fixedly mounted on the first mounting plate 17. The slide bar 19 is slidably mounted on the second slide rail 18. Multiple mounting seats 20 are fixedly mounted on the slide bar 19. Multiple locking blocks 21 are respectively fixedly mounted on multiple mounting seats 20. The slide bar 19 can slide along the second slide rail 18, driving the locking block 21 to insert into the locking slot 701 of the limiting post 7 to achieve secondary locking. The top of the locking block 21 and the connection points on both outer walls are designed with rounded corners so that it can be smoothly locked into the locking slot 701.

[0029] The drive assembly specifically includes a second mounting plate 22, multiple bearing seats 23, a lead screw 24, a driven block 25, a worm gear 26, a worm 27, and a connecting block 28. The second mounting plate 22 is fixedly mounted on the longitudinal support plate 4 by bolts. The multiple bearing seats 23 are all fixedly mounted on the second mounting plate 22. The lead screw 24 passes through and is rotatably mounted on the multiple bearing seats 23. The driven block 25 is threaded onto the lead screw 24. The threaded transmission between the lead screw 24 and the driven block 25 can drive the slide bar 19 to slide smoothly, achieving precise locking of the locking block 21. The worm gear 26 is fixedly mounted on the lead screw 24. The worm 27 is rotatably mounted on the second mounting plate 22. The worm 27 meshes with the worm gear 26. The drive assembly adopts the meshing transmission of the worm gear 26 and the worm 27, which has a self-locking feature. The mechanism prevents the locking block 21 from accidentally slipping off under load. The connecting block 28 is fixedly installed on the driven block 25. The end of the connecting block 28 away from the driven block 25 is detachably fixedly connected to the corresponding slide bar 19. Specifically, the corresponding slide bar 19 has multiple circular through holes. The end of the connecting block 28 away from the driven block 25 is fixedly installed with multiple connecting screws. The multiple connecting screws pass through the corresponding circular through holes and slide in connection with the inner wall of the corresponding circular through holes. The end of each connecting screw away from the connecting block 28 is threaded with a nut. The end of the worm gear 27 away from the slide bar 19 is fixedly installed with a hexagonal block. The hexagonal block has an internal hexagonal groove. The worm gear 27 can be rotated by a bayonet wrench or an internal hexagonal wrench.

[0030] In this embodiment, the connecting assembly specifically includes two slot boxes 29, a connecting plate 30, two L-shaped fixing blocks 31, two screws 32, and two pins 33. The two slot boxes 29 are respectively fixedly installed on the tops of the two slide bars 19 by bolts. The connecting plate 30 is disposed inside the two slot boxes 29 and has two insertion holes 3001. The two L-shaped fixing blocks 31 are respectively fixedly installed on the tops of the two slot boxes 29. The two screws 32 are respectively threaded onto the two L-shaped fixing blocks 31. The two pins 33 are respectively disposed on the two slide bars 19. The bottom end of the screw 32 is connected to the pin 33, which is integrally formed with the screw 32. The bottom end of the pin 33 extends into the insertion hole 3001. The connecting component connects the slide bars 19 of the two locking components into a whole through the connecting plate 30 and the pin 33, ensuring that the two locking components move synchronously and improving the consistency and reliability of locking. The longitudinal support plate 4 has a clearance square opening to meet the installation and disassembly requirements of the connecting plate 30. The connecting plate 30 has a finger groove, and the inner wall of the finger groove is treated with a frosted process to prevent the hand from slipping during installation.

[0031] In this embodiment: First, the lightweight guide beam 2 is smoothly hoisted to the predetermined position at the cantilever end of the main steel box girder 1 using a lifting device. The guide beam is then adjusted so that the limiting post 7 of the quick positioning and locking mechanism is aligned with the locking sleeve 5 on the main steel box girder 1. The flared guide groove 502 inside the locking sleeve 5 has a flared guide function. Even if there is a slight coaxiality deviation between the limiting post 7 and the locking sleeve 5, the limiting post 7 can be accurately inserted by the inclined surface of the guide groove. At the same time, the end of the limiting post 7 away from the fixed plate 6 is designed with rounded corners to reduce bumps and frictional resistance during insertion, ensuring that the limiting post 7 smoothly passes through the locking sleeve 5 and is inserted into the reinforcing sleeve 16 inside the main steel box girder 1, completing the initial alignment. During this process, the locking rod 10 on each rotating sleeve 8 will enter the vertical insertion section of the corresponding L-shaped locking port 501 because it moves axially with the limiting post 7. The reinforcing sleeve 16 can enhance the local bearing strength of the transverse support plate 3 and prevent the limiting post 7 from causing local stress concentration on the main steel box girder 1. When the electric push rod 15 is activated, its output end drives the connecting top plate 14 to move downward. The connecting top plate 14 simultaneously drives the two slide rods 13 to slide vertically downward along the sliding trajectory at the top of the I-beam. The bottom end of the slide rod 13 extends into the web groove and is fixedly connected to the top of the rack 12. Therefore, the slide rod 13 will simultaneously pull the two racks 12 to move linearly along the first slide rail 11. Since the rack 12 meshes with the gear 9 on the rotating sleeve 8, the linear motion of the rack 12 is converted into the rotational motion of the gear 9, which in turn drives the rotating sleeve 8 to rotate stably around the limiting post 7. The locking rod 10 on its outer wall completes the rotational locking action along the L-shaped locking port 501 of the locking sleeve 5. The locking rod 10 enters the rotational locking section from the vertical insertion section of the L-shaped locking port 501, realizing the first-level mechanical locking of the quick positioning locking mechanism. At this time, the relative displacement between the lightweight guide beam 2 and the steel box main beam 1 is effectively limited, and the initial fixation is completed.

[0032] After the first-level locking is completed, a suitable hex wrench is inserted into the internal hexagonal groove at the end of the worm 27, rotating the worm 27 to drive the meshing worm wheel 26 to rotate. The worm wheel 26 drives the coaxial lead screw 24 to rotate smoothly under the support of the bearing seat 23. Since the driven block 25 is threadedly connected to the lead screw 24, the rotational motion of the lead screw 24 is converted into linear motion of the driven block 25 along the axial direction of the lead screw 24. The driven block 25 pulls the corresponding slide bar 19 along the second slide rail 18 through the connecting block 28. The slide bars 19 of the two locking components move synchronously under the action of the connecting components. The slide bars 19 drive the mounting seat 20 and the locking block 21 to move towards the limiting post 7 until multiple locking blocks 21 are precisely embedded in the locking slots 701 on the outer wall of the limiting post 7, completing the second-level locking of the reinforced locking mechanism. Since the worm gear transmission has a self-locking characteristic, it can prevent the locking block 21 from accidentally disengaging under construction loads. The dual locking mechanism greatly improves the reliability and load-bearing capacity of the connection structure.

[0033] During construction, the mechanical engagement between the locking rod 10 and the L-shaped locking slot 501 of the quick-positioning locking mechanism can withstand lateral and vertical loads. The locking block 21 and the locking slot 701 of the reinforced locking mechanism can withstand torque and axial force. The combined effect of the two ensures the stability of the connection between the guide beam and the main beam, providing safe and reliable support for cantilever end construction. At the same time, all components adopt a rigid structure design, and key transmission parts are all treated with wear-resistant materials to extend their service life.

[0034] When the cantilever construction is completed and the lightweight guide beam 2 needs to be removed, firstly, the worm gear 27 is rotated in the reverse direction using a hex wrench, driving the worm wheel 26 and the lead screw 24 to rotate in the opposite direction. The driven block 25 drives the slide bar 19 and the locking block 21 to move away from the limit post 7. The locking block 21 completely exits the locking slot 701, releasing the secondary lock. Then, the electric push rod 15 is controlled to run in the reverse direction, and the output end pushes the connecting top plate 14 and the slide rod 13 to reset upward. The rack 12 drives the gear 9 and the rotating sleeve 8 to rotate in the opposite direction. The locking rod 10 exits along the rotating locking end of the L-shaped locking slot 501 to the straight insertion section, releasing the primary lock. Finally, the screw 32 on the L-shaped fixing block 31 is loosened, the pin 33 and the connecting plate 30 are pulled out, and the fixing bolts of the reinforcing locking mechanism and the quick positioning locking mechanism are disassembled. The lightweight guide beam 2 can then be lifted away from the steel box main beam 1, and the core components can be transferred to the next construction area for reuse.

[0035] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A lightweight guide beam and main beam quick connection structure for a long-span steel box girder bridge, comprising a steel box girder main beam and a lightweight guide beam, wherein the steel box girder main beam is provided with transverse and longitudinal bracing plates, and the lightweight guide beam comprises two I-beam main beams and an intermediate connecting frame, characterized in that, Multiple locking sleeves located on the outer side of the steel box girder are fixedly installed on the transverse support plate. A quick positioning and locking mechanism is installed at one end of each of the two I-beams near the steel box girder. The quick positioning and locking mechanism is used to cooperate with the locking sleeves to realize the fixed connection between the steel box girder and the lightweight guide beam. Multiple L-shaped locking holes are opened on the locking sleeves in a rotationally symmetrical manner. The quick positioning and locking mechanism includes multiple rotatable rotating sleeves. Multiple locking rods in a rotationally symmetrical manner are fixedly installed on the outer wall of the rotating sleeves. The locking rods are adapted to the L-shaped locking holes.

2. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 1, characterized in that, The rapid positioning and locking mechanism further includes multiple limiting posts, multiple gears, two first slide rails, two racks, two slide rods, a connecting top plate, and an electric push rod. Fixed plates are fixedly installed in the two web grooves of the I-beam main girder. Multiple limiting posts are respectively fixedly installed on their corresponding fixed plates. Each limiting post penetrates its corresponding locking sleeve and is movably connected to it. The end of each limiting post away from the fixed plate extends into the steel box girder. The rotating sleeve is rotatably fitted onto the limiting post. The two first slide rails are respectively fixedly installed on the I-beam main girder. On both sides of the web, two racks are slidably mounted on two first slide rails, and multiple gears are fixedly sleeved on multiple rotating sleeves. Both racks mesh with their corresponding gears. Both slide rods are slidably mounted on the top of the I-beam, and the bottom ends of both slide rods extend into the corresponding web grooves and are fixedly connected to the top ends of the corresponding racks. The connecting top plate is fixedly mounted on the top ends of the two slide rods. The electric push rod is fixedly mounted on the top of the I-beam, and the output end of the electric push rod is fixedly connected to the connecting top plate.

3. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 2, characterized in that, Two limiting rings are fixedly sleeved on the outer wall of the limiting post, and the two limiting rings are respectively located on both sides of the rotating sleeve.

4. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 2, characterized in that, The lock sleeve has a flared guide groove, and the end face of the limiting post away from the fixing plate is designed with rounded corners at the connection with the outer peripheral wall.

5. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 2, characterized in that, Multiple reinforcing sleeves located inside the main steel box girder are fixedly installed on the transverse support plate. The multiple reinforcing sleeves are coaxial with the multiple locking sleeves. The limiting post passes through the reinforcing sleeve and is slidably connected to the inner wall of the reinforcing sleeve.

6. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 2, characterized in that, Two sets of reinforcing locking mechanisms are installed inside the main steel box girder. The two sets of reinforcing locking mechanisms are respectively installed on the corresponding longitudinal support plates. Each reinforcing locking mechanism includes a connecting component, two locking components, and a driving component. The two locking components are detachably fixed on both sides of the corresponding longitudinal support plate. The driving component is detachably fixed on one side of the corresponding longitudinal support plate and is used to drive the two locking components to run. The connecting component is detachably fixed on the top of the two locking components. Each locking component includes multiple locking blocks. The outer wall of the limiting column has a locking slot located inside the main steel box girder. The locking blocks are adapted to the locking slot.

7. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 6, characterized in that, The locking assembly further includes a first mounting plate, a second slide rail, a slide bar, and multiple mounting seats. The first mounting plate is fixedly mounted on the longitudinal support plate by bolts. The second slide rail is fixedly mounted on the first mounting plate. The slide bar is slidably mounted on the second slide rail. The multiple mounting seats are all fixedly mounted on the slide bar. The multiple locking blocks are respectively fixedly mounted on the multiple mounting seats.

8. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 7, characterized in that, The drive assembly includes a second mounting plate, multiple shaft seats, a lead screw, a driven block, a worm gear, a worm, and a connecting block. The second mounting plate is fixedly mounted on the longitudinal support plate by bolts. The multiple shaft seats are all fixedly mounted on the second mounting plate. The lead screw passes through and is rotatably mounted on the multiple shaft seats. The driven block is threaded onto the lead screw. The worm gear is fixedly mounted on the lead screw. The worm is rotatably mounted on the second mounting plate and meshes with the worm gear. The connecting block is fixedly mounted on the driven block, and the end of the connecting block away from the driven block is detachably fixedly connected to the corresponding slide bar.

9. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 7, characterized in that, The connecting assembly includes two slots, a connecting plate, two L-shaped fixing blocks, two screws, and two pins. The two slots are respectively fixedly installed on the tops of the two slide bars by bolts. The connecting plate is disposed inside the two slots and has two insertion holes. The two L-shaped fixing blocks are respectively fixedly installed on the tops of the two slots. The two screws are respectively threaded onto the two L-shaped fixing blocks. The two pins are respectively disposed at the bottom ends of the two screws and are integrally formed with the screws. The bottom ends of the pins extend into the insertion holes.

10. The lightweight guide beam and main beam quick connection structure for long-span steel box girder bridges according to claim 8, characterized in that, A hexagonal block is fixedly installed at the end of the worm gear away from the slide bar, and an internal hexagonal groove is formed in the hexagonal block.

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