Steel box girder splicing and positioning device for bridge

Abstract

The invention discloses a bridge steel box girder assembly positioning device which comprises a first steel box girder and a second steel box girder, a centering driving assembly is arranged on the top of the first steel box girder, and a centering matching assembly matched with the centering driving assembly is arranged on the second steel box girder; the centering driving assembly comprises a hydraulic cylinder, a telescopic rod, a sleeve rod and an expansion rod, the telescopic rod is rotationally sleeved with the sleeve rod, and the expansion rod is rotationally arranged on the sleeve rod; the centering matching assembly comprises a matching block and centering sliding blocks, a reamed hole is formed in the middle of the matching block, multiple sets of centering sliding blocks are evenly arranged along the circumferential side of the reamed hole, arc-shaped openings are formed in the centering sliding blocks, a positioning hole is formed in the end, away from the first steel box girder, of the matching block, and an angle positioning part is arranged at the end, away from the hydraulic cylinder, of the sleeve rod. After the angle positioning part is inserted into the positioning hole, the sleeve rod is driven to rotate along with swinging of the second steel box girder, a reset piece for driving the sleeve rod to reset to the initial position is arranged on the first steel box girder, the steel box girder to be spliced and the installed steel box girder can be quickly and accurately positioned, and positioning is simple.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, specifically to a steel box girder assembly and positioning device for bridges. Background Technology

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges. They are generally used on bridges with large spans. Because their shape resembles a box, they are called steel box girders. When hoisting steel structure bridges, the steel box girder to be installed must be precisely aligned with the already installed steel box girder beforehand. Only after precise alignment can the two be connected into a whole by welding.

[0003] A bridge steel box girder assembly and positioning device with the existing authorized publication number CN218233172U includes a first bridge steel box girder and a second bridge steel box girder. The first bridge steel box girder has mounting frames on both its front and rear sides. In use, a crane lifts the second bridge steel box girder from the ground. A motor is turned on, causing a threaded rod to rotate. A nut causes a slider to slide, with a portion of the slider sliding out of a groove. The position of the second bridge steel box girder is then adjusted so that the slider on the mounting frame slides into the groove on the slider. This ensures that both sides of the second bridge steel box girder are maintained at the corresponding position and height with the first bridge steel box girder via the slider and groove, thus preventing swaying during subsequent splicing, positioning, and welding processes.

[0004] The existing solutions described above have the following problems: Since the steel box girder is moved by hoisting equipment, there will be swaying during the movement, making it difficult to align the two nuts with the positioning holes and the two sliders with the sliding grooves. It is necessary to use the hoisting device to ensure the height and horizontal angle of the steel box girder. Therefore, this invention applies for a steel box girder assembly and positioning device for bridges to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a steel box girder assembly and positioning device for bridges to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a steel box girder assembly and positioning device for bridges, comprising a first steel box girder and a second steel box girder to be assembled, wherein the top of the first steel box girder is provided with an active centering component, and the second steel box girder is provided with an active centering component that cooperates with the active centering component. The centering active component includes a hydraulic cylinder, a telescopic rod, a sleeve rod, and an expansion rod. The telescopic rod is fixed to the output end of the hydraulic cylinder. The sleeve rod is sleeved on the end of the telescopic rod away from the hydraulic cylinder and forms a rotatable connection with the telescopic rod. The expansion rod is rotatably mounted on the sleeve rod. The centering assembly includes a mating block and a centering slider. The mating block has an enlarged hole in the middle for the sleeve rod to pass through. The diameter of the enlarged hole is larger than the diameter of the sleeve rod. Multiple sets of centering sliders are evenly arranged around the enlarged hole. The centering sliders are slidably disposed within the mating block. The end of the centering slider facing the enlarged hole has an arc-shaped opening that matches the outer wall of the sleeve rod. The mating block is equipped with a synchronous linkage assembly that drives all centering sliders to slide synchronously along the radial direction of the enlarged hole. The end of the mating block away from the first steel box girder has a positioning hole. The end of the sleeve rod away from the hydraulic cylinder has an angle positioning part for inserting into the positioning hole. After the angle positioning part is inserted into the positioning hole, it drives the sleeve rod to rotate following the swing of the second steel box girder. The first steel box girder is equipped with a reset part that drives the sleeve rod to return to its initial position.

[0007] Preferably, the mating blocks are provided in two sets. The top of the steel box girder is fixed with a slide rail for the mating blocks to slide. The slide rail is provided with a sliding groove in the middle. The bottom of the mating block is provided with a slider that is slidably connected to the sliding groove. The slide rail is rotatably provided with a long rod in the sliding groove. The slider is provided with a rod hole for the long rod to pass through. The rod hole is provided with a spiral groove. The long rod is provided with a first guide shaft that is slidably engaged with the spiral groove in the two sets of rod holes. The sliding of the mating blocks causes the synchronous linkage component to drive the centering slider to move towards the center of the enlarged hole.

[0008] Preferably, the synchronous linkage component includes a synchronous disk and a bridge plate. The synchronous disk is rotatably mounted within the mating block. Each set of centering sliders has a guide rod on the side near the synchronous disk. The synchronous disk has an arc-shaped groove for the guide rod to slide at each set of guide rods. The bridge plate is fixed to the top of the steel box girder by support legs. The bridge plate passes through two sets of mating blocks, and the mating blocks are slidably mounted on the bridge plate. The bottom of the bridge plate has a partial spiral groove at each set of synchronous disks. The outer wall of the synchronous disk has a synchronous guide shaft that slides with the partial spiral groove.

[0009] Preferably, the top of the slide rail is provided with multiple sets of slots evenly on both sides of the sliding groove, and the bottom of the mating block is provided with a locking block that slids up and down to cooperate with the slots, and one side of the locking block is provided with an inclined surface.

[0010] Preferably, the expansion rod is provided in multiple sets along the periphery of the sleeve rod, and a gear is fixed at one end of each set of expansion rods. The outer wall of the sleeve rod is provided with a long groove for hiding the expansion rod. The two ends of the gear are provided with short shafts in the axial direction. The inner wall of the long groove is provided with a rotating hole. The short shaft is rotatably connected to the rotating hole through a one-way bearing. The middle part of the sleeve rod is provided with a driving component for driving the gear to rotate.

[0011] Preferably, the driving component is a rack, which is slidably disposed in the middle of the sleeve along the axial direction of the sleeve. The rack has teeth on the end face facing each set of expansion rods that mesh with gears. In the initial state, one end of the rack is located at the outer end of the sleeve.

[0012] Preferably, the angle positioning part includes a stop plate and a short rod. The stop plate is disposed on the end of the toothed rod located outside the sleeve rod, and the short rod is fixed on the axial end of the stop plate. The end of the toothed rod is provided with a short groove for sliding connection of the short rod. A spring is fixed inside the short groove, and one end of the spring is fixedly connected to the end of the short rod. A second guide shaft is fixed on the outer periphery of the stop plate. A base is fixed on the mating block away from the sleeve rod. The base is fixed to the mating block by a connecting rod. A positioning hole is disposed on the base and is coaxial with the enlarged hole. The inner wall of the positioning hole is provided with an arc-shaped inclined step for abutting against the second guide shaft. The end of the arc-shaped inclined step is provided with a positioning groove for the second guide shaft to be inserted.

[0013] Preferably, the end of the expansion rod that abuts against the mating block is provided with a ball.

[0014] Preferably, the reset component is a reset sleeve, which is sleeved on the outside of the sleeve rod and fixed to the steel box girder by a fixing block. The inner wall of the reset sleeve is provided with an arc-shaped step plate, and the lowest point of the arc-shaped step plate is provided with a positioning extension groove. The outer wall of the sleeve rod is provided with a third guide shaft for abutting against the top end face of the arc-shaped step plate. After the third guide shaft passes through the positioning extension groove, the sleeve rod is reset to the initial angle position.

[0015] Preferably, the steel box girder is fixed with mounting brackets on both sides, the mounting brackets are provided with stabilizing grooves on the inner side, the steel box girder is provided with stabilizing plates on both sides for docking with the stabilizing grooves, the mounting brackets are provided with side grooves in the stabilizing grooves, the side grooves are provided with one-way gears, and the outer wall of the stabilizing plates is provided with racks that mesh with the one-way gears.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a sleeve on the telescopic rod of the hydraulic cylinder, and having an enlarged hole on the mating block with a diameter larger than the sleeve, the sleeve can be quickly passed through. An expansion rod is rotatably set on the sleeve. The expansion rod rotates through the meshing of a gear and a rack. When the expansion rod moves with the sleeve to the end of the mating block away from the hydraulic cylinder, the rack moves against the base, causing the expansion rod to rotate out and form abutment with the mating block. The expansion rod then moves back with the sleeve, pulling the mating block to move. Through the synchronous linkage component, the ends of all the sliders with arc-shaped openings press against the sleeve, thereby achieving the alignment of the second steel box girder with the first steel box girder. After the second steel box girder is aligned with the first steel box girder, the second steel box girder will still sway due to rotation under the hoisting device. The sleeve rod will rotate and be sleeved on the telescopic rod. The second guide shaft of the abutment plate will be locked into the positioning groove under the action of the spring, so that the sleeve rod will rotate with the swing of the second steel box girder. After the sleeve rod is pulled back by the hydraulic cylinder, the third guide shaft on the sleeve rod will abut against the arc-shaped step plate and enter the positioning extension groove, so that the sleeve rod will rotate back to the initial position, thereby aligning the horizontal angle of the second steel box girder with the first steel box girder. In summary, the sleeve rod follows the extension and retraction of the hydraulic cylinder and pulls the second steel box girder towards the first steel box girder through the expansion rod, thereby achieving automatic centering and alignment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an illustrative diagram illustrating the overall structure of the invention, highlighting one side of the base. Figure 3 This is an exploded view of the angle positioning part, the toothed rod, and the expansion rod of the present invention. Figure 4 This is a schematic diagram of the structure of the ball on the expansion rod in this invention; Figure 5 This is a schematic diagram of the structure of the present invention that highlights the position of the enlarged hole in the mating block; Figure 6 yes Figure 5 An enlarged schematic diagram of part A in the middle; Figure 7 This is an exploded view of the present invention highlighting the synchronization disk, mating block, and bridge plate; Figure 8 This is a cross-sectional view of the interior of the groove in this invention; Figure 9 This is a schematic diagram of the internal structure of the positioning hole of the base in this invention; Figure 10 This is a schematic diagram highlighting the internal structure of the reset sleeve of the present invention; Figure 11 This is a schematic diagram illustrating the structure of the one-way gear of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Steel box girder one; 2. Steel box girder two; 3. Centering active assembly; 31. Hydraulic cylinder; 32. Telescopic rod; 33. Sleeve rod; 34. Expansion rod; 4. Centering mating assembly; 41. Mating block; 42. Centering slider; 5. Hole enlargement; 6. Synchronous linkage assembly; 7. Positioning hole; 8. Angle positioning part; 81. Support plate; 82. Short rod; 9. Reset sleeve; 10. Slide rail; 11. Sliding groove; 12. Slider; 13. Long rod; 14. Rod hole; 15. Spiral groove; 16. First guide shaft; 17. Slot; 18. Locking block; 19. Inclined surface; 20. Gear; 21. Long groove; 22. Short shaft; 23. Rotary hole; 24. One-way bearing; 25. Gear rack; 26. Tooth section; 27. 1. Short groove; 28. Spring; 29. ​​Second guide shaft; 50. Base; 51. Connecting rod; 52. Arc-shaped inclined step; 53. Positioning groove; 54. Sphere; 55. Fixing block; 56. Arc-shaped step plate; 57. Positioning extension groove; 58. Third guide shaft; 59. Synchronous disc; 60. Bridge plate; 61. Guide rod; 62. Arc-shaped groove; 63. Support leg; 64. Partial spiral groove; 66. Synchronous guide shaft; 67. Disc groove; 68. Slide rail; 69. Bridge plate groove; 70. Rotation area; 71. Guide rod groove; 72. Locking block groove; 73. Tension spring; 74. Mounting bracket; 75. Stabilizing groove; 76. Stabilizing plate; 77. Side groove; 78. One-way gear; 79. Rack; 80. Gear groove. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-11 The present invention provides a technical solution: See Figure 1 This technical solution discloses a bridge steel box girder assembly and positioning device, which aims to solve the problem of positioning difficulties caused by hoisting sway during the existing steel box girder assembly process. Through the coordinated action of the centering active component 3 and the centering cooperation component 4, the automatic centering and angle alignment of steel box girder 2 and steel box girder 1 are realized. The following is a detailed description of the connection relationship, position relationship and working logic of each component.

[0022] See Figure 1 , 3First, the basic structure of the device includes an installed steel box girder 1 and a steel box girder 2 to be spliced. The centering active component 3 is set on the top of the steel box girder 1, and the centering mating component 4 is set on the top of the steel box girder 2. Both the centering active component 3 and the centering mating component 4 can be pre-welded or bolted to the steel box girder for easy disassembly after use. The two cooperate during the assembly process to complete the positioning. The core components of the centering active assembly 3 are a hydraulic cylinder 31, a telescopic rod 32, a sleeve rod 33, and an expansion rod 34. The hydraulic cylinder 31 is fixedly installed at a preset position on the top of the steel box girder 1. One end of the telescopic rod 32 is fixedly connected to the output end of the hydraulic cylinder 31. The sleeve rod 33 is sleeved on the end of the telescopic rod 32 away from the hydraulic cylinder 31, and the sleeve rod 33 and the telescopic rod 32 are rotatably connected, allowing the sleeve rod 33 to rotate around the axis of the telescopic rod 32. Multiple sets of expansion rods 34 are evenly arranged along the circumference of the sleeve rod 33. The outer wall of the sleeve rod 33 has a long groove 21 for storing and hiding the expansion rods 34. One end of each set of expansion rods 34 is fixedly connected to a gear 20, and the gear 20 axially... Each end is provided with a short shaft 22, and the inner wall of the long groove 21 is provided with a rotating hole 23 corresponding to the position of the short shaft 22. The short shaft 22 is rotatably connected to the rotating hole 23 through a one-way bearing 24, ensuring that the expansion rod 34 can only rotate outward in one direction to the outside of the sleeve rod 33. At the same time, a driving component is slidably provided in the middle of the sleeve rod 33 along its axial direction. The driving component is a rack 25. The end face of the rack 25 facing each set of expansion rods 34 is provided with teeth 26 that mesh with the gear 20. In the initial state, one end of the rack 25 extends outward to the outside of the sleeve rod 33 so as to cooperate with other components later. The middle of the sleeve rod 33 is provided with a rack groove 80 for the rack 25 to slide. The rack groove 80 is connected to each set of long grooves 21.

[0023] See Figure 1 , 5Correspondingly, the centering assembly 4 includes a mating block 41, a centering slider 42, and a synchronous linkage assembly 6. Two sets of mating blocks 41 are provided. A slide rail 10 for sliding the mating block 41 is fixedly installed on the top of the steel box girder 2. A sliding groove 11 is provided in the middle of the slide rail 10. A slider 12 adapted to the sliding groove 11 is integrally formed on the bottom of the mating block 41. The slider 12 is embedded in the sliding groove 11 and forms a sliding connection with the sliding groove 11. A long rod 13 is rotatably installed inside the slide rail 10 and the slider 12 has a rod hole 14 for the long rod 13 to pass through. A spiral groove 15 is provided on the inner wall of the rod hole 14. The long rod 13 is located inside the rod holes 14 of the two sets of sliders 12 and has a first guide shaft respectively. 16. The first guide shaft 16 and the spiral groove 15 form a sliding fit. When the long rod 13 rotates, the two sets of mating blocks 41 can be driven to move synchronously along the sliding groove 11 through the fit between the first guide shaft 16 and the spiral groove 15. At the same time, multiple sets of slots 17 are evenly opened on both sides of the sliding groove 11 at the top of the slide rail 10. The bottom of the mating block 41 is provided with a slot 72. The slot 18 slides up and down in the slot 72. The bottom of the slot 18 is provided with an inclined surface 19. When the mating block 41 slides to the target position, the slot 18 can be embedded in the slot 17 under its own weight or the action of the elastic element (the elastic element includes the tension spring 73) to achieve temporary fixation of the mating block 41. The inclined surface 19 makes the mating block 41 slide only in one direction.

[0024] See Figure 1 , 5-8. Multiple sets of centering sliders 42 are evenly arranged around the circumference of the enlarged hole 5 in the middle of the mating block 41. The middle of the mating block 41 has an enlarged hole 5 for the sleeve rod 33 to pass through. The diameter of the enlarged hole 5 is larger than the diameter of the sleeve rod 33 so that the sleeve rod 33 can still be easily passed through when the hoisting is swaying. The centering slider 42 is slidably arranged in the preset slide rail 68 inside the mating block 41, and the end of the centering slider 42 facing the enlarged hole 5 has an arc-shaped opening that matches the outer wall of the sleeve rod 33, ensuring that the centering slider 42 can achieve stable limiting and centering positioning when it is in contact with the outer wall of the sleeve rod 33; the synchronous linkage component 6 is used to drive all the centering sliders 42. The sliding block 42 slides synchronously along the radial direction of the enlarged hole 5. The synchronous linkage assembly 6 includes a synchronous disc 59 and a bridge plate 60. The mating block 41 is provided with a disc groove 67. The synchronous disc 59 is rotatably installed inside the mating block 41 through the disc groove 67. Each set of centering sliders 42 has a guide rod 61 fixed on the side near the synchronous disc 59. The synchronous disc 59 has an arc-shaped groove 62 for the guide rod 61 to slide at the position corresponding to each set of guide rods 61. The end of the guide rod 61 away from the centering slider 42 is embedded in the arc-shaped groove 62 and forms a sliding fit with the arc-shaped groove 62. The bridge plate 60 is fixedly installed on the top of the steel box girder 2 through the support legs 63. A bridge plate 60 extends along the length of the steel box girder 2 through two sets of mating blocks 41. Each mating block 41 has a bridge plate groove 69 through which the bridge plate 60 passes. The mating blocks 41 and the bridge plate 60 are slidably connected via the bridge plate groove 69. The bottom of the bridge plate 60 has a local spiral groove 64 corresponding to the position of each set of synchronous discs 59. A synchronous guide shaft 66 is fixed to the outer wall of the synchronous disc 59. The synchronous guide shaft 66 is embedded in the local spiral groove 64 and forms a sliding fit with it (the bottom of the bridge plate 60 is a concave arc surface, and the local spiral groove 64 is set on the concave arc surface to ensure that the synchronous guide shaft 66 is in a sliding fit within the local spiral groove 64). (It will not get stuck when sliding in the groove 64) When the mating block 41 slides along the bridge plate 60, the sliding of the synchronous guide shaft 66 in the local spiral groove 64 will drive the synchronous disk 59 to rotate. The rotation of the synchronous disk 59 will drive all the centering sliders 42 to move synchronously closer to or away from the center of the enlarged hole 5 through the cooperation of the arc groove 62 and the guide rod 61. It should be noted that: the top of the disk groove 67 is provided with a rotating area 70. The synchronous guide shaft 66 extends into the bridge plate groove 69 through the rotating area 70 and forms a sliding cooperation with the local spiral groove 64. The mating block 41 has a guide rod groove 71 between the disk groove 67 and the slide 68 for the guide rod 61 to slide.

[0025] See Figure 1 , 39. In addition, the end of the mating block 41 away from the steel box girder 1 is also provided with an angle positioning structure. A base 50 is fixedly installed on the side of the mating block 41 away from the steel box girder 1. The base 50 is fixed to the mating block 41 by a connecting rod 51. The connecting rod 51 will not affect the rotation of the expansion rod 34. A positioning hole 7 is provided on the base 50. The positioning hole 7 is coaxially arranged with the expansion hole 5 in the middle of the mating block 41. An angle positioning part 8 is provided at the end of the sleeve rod 33 away from the hydraulic cylinder 31. The angle positioning part 8 includes a stop plate 81 and a short A rod 82 and abutment 81 are located at the end of the toothed rod 25 extending outside the sleeve rod 33. The short rod 82 is fixed in the middle of the abutment 81. A short groove 27 is formed at the end of the toothed rod 25 corresponding to the position of the short rod 82. A spring 28 is fixedly connected to the inner end of the short groove 27, and the other end of the spring 28 is fixedly connected to the end of the short rod 82, allowing the short rod 82 to slide elastically within the short groove 27. The short rod 82 is a non-circular rod. A second guide shaft 29 is fixedly provided on the outer periphery of the abutment 81. A notch is formed on the inner wall of the positioning hole 7 that abuts against the second guide shaft 29. The curved inclined step 52 has a positioning groove 53 at its end for the second guide shaft 29 to be inserted. When the sleeve rod 33 passes through the expansion hole 5 and the abutment 81 approaches the base 50, if the abutment 81 is not coaxial with the positioning hole 7, the abutment 81 will abut against the end face of the base located outside the positioning hole 7. This drives the rack 25 to move and, through its engagement with the gear 20, drives the expansion rod 34 to rotate out of the sleeve rod 33. The expansion rod 34 then pulls a set of mating blocks 41 with the base 50 toward the hydraulic cylinder 31. Multiple sets of centering sliders 42 within the mating block 41 move toward the enlarged hole 5 and press against the outer wall of the sleeve rod 33. After all the centering sliders 42 press against the sleeve rod 33, the positioning hole 7 will be coaxial with the abutment plate 81. Under the action of the spring 28, the abutment plate 81 will be ejected into the positioning hole 7 and abut against the arc-shaped step through the second guide shaft 29, so that the second guide shaft 29 is finally locked into the positioning groove 53, allowing the sleeve rod 33 to rotate synchronously with the swing of the steel box girder 2. It should be noted that the diameter of the abutment plate 81 is smaller than the diameter of the sleeve rod 33.

[0026] See Figure 1 , 10 To achieve the reset of the sleeve rod 33 after rotation, a reset component is provided on the steel box girder 1. The reset component is a reset sleeve 9, which is sleeved on the outside of the sleeve rod 33 and fixedly connected to the top of the steel box girder 1 through a fixing block 55. An arc-shaped step plate 56 is fixedly provided on the inner wall of the reset sleeve 9. A positioning extension groove 57 is provided at the lowest point of the arc-shaped step plate 56. A third guide shaft 58 is fixedly provided on the outer wall of the sleeve rod 33. When the sleeve rod 33 rotates, the third guide shaft 58 will abut against the top end face of the arc-shaped step plate 56. When the sleeve rod 33 moves to one side of the steel box girder 1 under the pull of the hydraulic cylinder 31, the third guide shaft 58 will slide along the end face of the arc-shaped step plate 56 and finally slide into the positioning extension groove 57, so that the sleeve rod 33 is restricted to the initial angle position, thereby driving the horizontal angle of the steel box girder 2 to align with the steel box girder 1.

[0027] See Figure 1 , 3 4. In order to facilitate rotation during the process of expansion rod 34 abutting against mating block 41 and driving mating block 41 to slide, a ball 54 is provided on the side of expansion rod 34 that abuts against mating block 41 after it opens. When the horizontal angle position of steel box girder 2 is adjusted so that expansion rod 34 rotates with sleeve rod 33, the friction between expansion rod 34 and mating block 41 can be reduced.

[0028] See Figure 1 , 11 Meanwhile, to improve the stability during the assembly of the steel box girder, mounting brackets 74 are fixedly installed on both sides of the steel box girder 1. Stabilizing grooves 75 are provided on the inner side of the mounting brackets 74. Stabilizing plates 76 are fixedly installed on both sides of the steel box girder 2, corresponding to the positions of the stabilizing grooves 75. The dimensions of the stabilizing plates 76 are adapted to the stabilizing grooves 75. When the sleeve rod 33 returns to its initial position via the reset component, the steel box girder 2 and the steel box girder 1 are perfectly aligned, and the stabilizing plates 76 are directly opposite the stabilizing grooves 75. The frame 74 has a side groove 77 on the inner wall of the stabilizing groove 75. A one-way gear 78 is rotatably installed in the side groove 77 via a rotating shaft. The outer wall of the stabilizing plate 76 has a rack 79 that meshes with the one-way gear 78. When the second steel box girder 2 approaches the first steel box girder 1, the rack 79 meshes with the one-way gear 78 for transmission. The one-way rotation characteristic of the one-way gear 78 (rotatably installed in the side groove 77 via a one-way bearing 24) can prevent the second steel box girder 2 from sliding in the opposite direction during the positioning process, further ensuring the stability of the assembly.

[0029] See Figure 1-11During the actual assembly operation, the steel box girder 2 is first hoisted to the vicinity of the splicing position of the steel box girder 1 using hoisting equipment. The hydraulic cylinder 31 is then activated, driving the telescopic rod 32 to extend and move the sleeve rod 33 towards one side of the steel box girder 2. Because the diameter of the enlarged hole 5 on the mating block 41 is larger than the diameter of the sleeve rod 33, even if the steel box girder 2 experiences hoisting sway, the sleeve rod 33 can still smoothly pass into the enlarged hole 5. As the sleeve rod 33 continues to advance, one end of the toothed rod 25 extending from the sleeve rod 33 abuts against the base 50. Under the action of the thrust, the toothed rod 25 slides inward along the axial direction of the sleeve rod 33. The teeth 26 on the toothed rod 25 interact with the expansion rod 34. One end of the gear 20 meshes, driving the expansion rod 34 to rotate unidirectionally out of the long groove 21 around the short shaft 22 until the rack 25 is completely slid into the sleeve 33. The hydraulic cylinder 31 then begins to retract in the opposite direction, pulling the mating block 41 towards the side of the steel box girder 1 through the telescopic rod 32, sleeve 33, and expansion rod 34. The slider 12 at the bottom of the mating block 41 slides along the sliding groove 11 of the slide rail 10. At the same time, the mating block 41 slides along the bridge plate 60. The synchronous guide shaft 66 slides in the local spiral groove 64 at the bottom of the bridge plate 60 and drives the synchronous disc 59 to rotate. The synchronous disc 59 drives all the centering sliders 42 synchronously through the arc groove 62 and the guide rod 61. Move towards the center of the enlarged hole 5 until the arc-shaped openings of all the alignment sliders 42 are tightly fitted with the outer wall of the sleeve rod 33, achieving lateral alignment of the steel box girder 2 and the steel box girder 1. After the lateral alignment of the steel box girder 2 and the steel box girder 1, the abutment 81 will form a coaxial shape with the positioning hole 7. The spring 28 drives the abutment 81 to spring into the positioning hole 7. The second guide shaft 29 will abut against the arc-shaped inclined step 52 and finally be stuck into the positioning groove 53. During this process, the abutment 81 will rotate and drive the sleeve rod 33 to rotate through the toothed rod 25. When the hydraulic cylinder 31 continues to retract and pull the sleeve rod 33 closer to the steel box girder 1, the third guide shaft 58 on the outer wall of the sleeve rod 33 and the composite The arc-shaped step plate 56 on the inner wall of the sleeve 9 abuts against each other. As the sleeve rod 33 moves, the third guide shaft 58 slides along the arc-shaped step plate 56 and finally enters the positioning extension groove 57. The sleeve rod 33 is reset to the initial angle, thereby driving the steel box girder 2 to rotate to a position that is aligned with the steel box girder 1 through the abutment of the second guide shaft 29 against the inner wall of the positioning groove 53. After the centering and angle alignment are completed, the stabilizing plate 76 is gradually embedded into the stabilizing groove 75 of the mounting frame 74. The rack 79 meshes with the one-way gear 78 to prevent the steel box girder 2 from sliding in the opposite direction. At this time, the positioning operation of the steel box girder 2 and the steel box girder 1 is completed, and subsequent welding connection can be carried out.

[0030] In summary, this embodiment achieves automatic alignment and angle alignment between steel box girder 2 and steel box girder 1 under hoisting sway by precisely coordinating the centering active component 3 and the centering mating component 4, using the hydraulic cylinder 31 to drive the extension and retraction of the sleeve rod 33, combined with the support and pulling of the expansion rod 34, the synchronous centering of the synchronous linkage component 6, and the angle reset of the reset component. This solves the problems of complex operation and significant impact of sway on positioning accuracy of existing positioning devices. Furthermore, the connection relationship and positional layout of each component are reasonable, ensuring the overall stability and reliability of the device and meeting the high-precision positioning requirements for bridge steel box girder assembly. In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bridge steel box girder assembly and positioning device, comprising a first steel box girder (1) and a second steel box girder (2) to be assembled, characterized in that: The top of the first steel box girder (1) is provided with an active centering component (3), and the second steel box girder (2) is provided with an active centering component (4) that cooperates with the active centering component (3). The centering active component (3) includes a hydraulic cylinder (31), a telescopic rod (32), a sleeve rod (33), and an expansion rod (34). The telescopic rod is fixed on the output end of the hydraulic cylinder (31). The sleeve rod (33) is sleeved on the end of the telescopic rod (32) away from the hydraulic cylinder (31) and forms a rotatable connection with the telescopic rod (32). The expansion rod (34) is rotatably mounted on the sleeve rod (33). The centering assembly (4) includes a mating block (41) and a centering slider (42). The mating block (41) has an enlarged hole (5) in the middle for the sleeve rod (33) to pass through. The diameter of the enlarged hole (5) is larger than the diameter of the sleeve rod (33). Multiple sets of centering sliders (42) are evenly arranged around the enlarged hole (5). The centering sliders (42) are slidably disposed in the mating block (41). The end of the centering slider (42) facing the enlarged hole (5) has an arc-shaped opening that matches the outer wall of the sleeve rod (33). The mating block (41) is equipped with a drive mechanism for all mating components. The synchronous linkage assembly (6) of the middle slider (42) slides synchronously along the radial direction of the enlarged hole (5). The end of the mating block (41) away from the first steel box beam (1) is provided with a positioning hole (7). The end of the sleeve rod (33) away from the hydraulic cylinder (31) is provided with an angle positioning part (8) for inserting into the positioning hole (7). After the angle positioning part (8) is inserted into the positioning hole (7), it drives the sleeve rod (33) to rotate following the swing of the second steel box beam (2). The first steel box beam (1) is provided with a reset member to drive the sleeve rod (33) back to the initial position.

2. The bridge steel box girder assembly and positioning device according to claim 1, characterized in that: The mating block (41) is provided in two sets. The top of the steel box girder (2) is fixed with a slide rail (10) for the mating block (41) to slide. The middle of the slide rail (10) is provided with a sliding groove (11). The bottom of the mating block (41) is provided with a slider (12) that is slidably connected to the sliding groove (11). The slide rail (10) is provided with a long rod (13) that rotates in the sliding groove (11). The slider (12) is provided with a rod hole (14) for the long rod (13) to pass through. The rod hole (14) is provided with a spiral groove (15). The long rod (13) is provided with a first guide shaft (16) that is slidably connected to the spiral groove (15) in the two sets of rod holes (14). The sliding of the mating block (41) causes the synchronous linkage component (6) to drive the centering slider (42) to move toward the center of the enlarged hole (5).

3. The bridge steel box girder assembly and positioning device according to claim 2, characterized in that: The synchronous linkage component (6) includes a synchronous disk (59) and a bridge plate (60). The synchronous disk (59) is rotatably disposed in the mating block (41). Each set of centering sliders (42) is provided with a guide rod (61) on the side near the synchronous disk (59). The synchronous disk (59) is provided with an arc groove (62) for sliding of the guide rod (61) at each set of guide rods (61). The bridge plate (60) is fixed to the top of the steel box girder (2) by a support leg (63). The bridge plate (60) passes through the front and rear sets of mating blocks (41). The mating blocks (41) are slidably disposed on the bridge plate (60). The bottom of the bridge plate (60) is provided with a local spiral groove (64) corresponding to each set of synchronous disks (59). The outer wall of the synchronous disk (59) is provided with a synchronous guide shaft (66) that forms a sliding fit with the local spiral groove (64).

4. The bridge steel box girder assembly and positioning device according to claim 2, characterized in that: The top of the slide rail (10) is evenly provided with multiple sets of slots (17) on both sides of the sliding groove (11). The bottom of the mating block (41) is provided with a locking block (18) that mates with the slots (17). One side of the locking block (18) is provided with an inclined surface (19).

5. The bridge steel box girder assembly and positioning device according to claim 1, characterized in that: The expansion rod (34) is provided in multiple sets along the periphery of the sleeve rod (33). A gear (20) is fixed at one end of each expansion rod (34). The outer wall of the sleeve rod (33) is provided with a long groove (21) for hiding the expansion rod (34). The gear (20) is provided with short shafts (22) at both ends in the axial direction. The inner wall of the long groove (21) is provided with a rotating hole (23). The short shaft (22) is rotatably connected to the rotating hole (23) through a one-way bearing (24). The middle part of the sleeve rod (33) is provided with a driving component for driving the gear (20) to rotate.

6. The bridge steel box girder assembly and positioning device according to claim 5, characterized in that: The driving component is a rack (25). The rack (25) is slidably disposed in the middle of the sleeve (33) along the axial direction of the sleeve (33). The rack (25) is provided with teeth (26) that mesh with the gear (20) on the end face facing each set of expansion rods (34). In the initial state, one end of the rack (25) is located at the outer end of the sleeve (33).

7. The steel box girder assembly and positioning device for bridges according to claim 6, characterized in that: The angle positioning part (8) includes a stop plate (81) and a short rod (82). The stop plate (81) is disposed on the end of the rack (25) outside the sleeve rod (33). The short rod (82) is fixed on the axial end of the stop plate (81). The end of the rack (25) is provided with a short groove (27) for sliding connection of the short rod (82). A spring (28) is fixed inside the short groove (27). One end of the spring (28) is fixedly connected to the end of the short rod (82). A second guide is fixed on the outer periphery of the stop plate (81). A base (50) is fixed on a mating block (41) on the side away from the sleeve rod (33) of the shaft (29). The base (50) is fixed on the mating block (41) by a connecting rod (51). A positioning hole (7) is set on the base (50) and is coaxial with the enlarged hole (5). The inner wall of the positioning hole (7) is provided with an arc-shaped inclined step (52) for abutting against the second guide shaft (29). The end of the arc-shaped inclined step (52) is provided with a positioning groove (53) for the second guide shaft (29) to be inserted.

8. The bridge steel box girder assembly and positioning device according to claim 1, characterized in that: The end of the expansion rod (34) that is used to abut against the mating block (41) is provided with a ball (54).

9. The steel box girder assembly and positioning device for bridges according to claim 1, characterized in that: The reset component is a reset sleeve (9). The reset sleeve (9) is sleeved on the outside of the sleeve rod (33) and fixed to the steel box beam (1) by a fixing block (55). The inner wall of the reset sleeve (9) is provided with an arc-shaped step plate (56). The lowest point of the arc-shaped step plate (56) is provided with a positioning extension groove (57). The outer wall of the sleeve rod (33) is provided with a third guide shaft (58) for abutting against the top end face of the arc-shaped step plate (56). After the third guide shaft (58) passes through the positioning extension groove (57), the sleeve rod (33) is reset to the initial angle position.

10. A bridge steel box girder assembly and positioning device according to claim 1, characterized in that: The steel box girder is fixed with mounting brackets (74) on both sides. The mounting brackets (74) are provided with stabilizing grooves (75) on the inner side. The two sides of the steel box girder (2) are provided with stabilizing plates (76) for docking with the stabilizing grooves (75). The mounting brackets (74) are provided with side grooves (77) in the stabilizing grooves (75). The side grooves (77) are provided with one-way gears (78). The outer wall of the stabilizing plate (76) is provided with racks (79) that mesh with the one-way gears (78).

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