Synchronous tensioning and replacement device and construction method for highway bridge hangers

Abstract

This invention discloses a synchronous tensioning and replacement device and construction method for highway bridge hangers, relating to the field of highway bridge maintenance and reinforcement. It includes a T-shaped connecting beam, the top of which is fixed to a beam at the top of the bridge via a connecting plate. Inclined plates are symmetrically arranged on both sides of the connecting beam, and a pair of cable reels are symmetrically arranged on both sides of the top of the connecting beam. Openings are provided on the connecting beam corresponding to the cable reels. A connecting sleeve is fitted on the side of the inclined plate away from the connecting beam. This invention achieves synchronous tensioning and reliable unidirectional locking of the hangers through the cooperation of the cable reels in the top fixing unit, the clamping plate in the bottom fixing unit, and the internal one-way locking mechanism. This effectively avoids safety hazards such as hanger slippage, loosening, and sudden changes in localized stress on the bridge caused by replacing hangers one by one or unreliable clamping in traditional construction methods.

Description

Technical Field

[0001] This invention relates to the field of highway bridge maintenance, repair and reinforcement, specifically to a synchronous tensioning and replacement device and construction method for highway bridge hangers. Background Technology

[0002] During long-term use, the hangers of highway bridges, as key load-bearing components, will experience performance degradation due to fatigue, corrosion, or material aging, necessitating replacement. A key challenge during hanger replacement is ensuring a smooth and synchronized transfer of load between the old and new hangers to avoid adverse effects on the bridge structure.

[0003] Currently, existing hanger replacement devices and construction methods mostly employ temporary scaffolds in conjunction with manual or hydraulic jacks for tensioning and replacing individual hangers. A common practice is to set up temporary fixing points at the top and bottom of the bridge, tensioning each hanger individually using a winch or manual hoist, and then locking it with anchorages. Some solutions include a simple clamping mechanism at the bottom to prevent hanger slippage.

[0004] However, the aforementioned existing technologies have significant shortcomings in practical applications. On the one hand, due to the lack of effective synchronous tension control of the hangers, the forces among the hangers are difficult to coordinate, which can easily cause sudden changes in local stress on the bridge and affect structural safety. On the other hand, the bottom clamping devices are mostly simple friction clamps with poor locking reliability, and slippage or loosening is prone to occur during tensioning. In addition, the existing devices have limited ability to adjust the forces on the hangers during construction, and cannot achieve dynamic and precise adjustment according to the actual stress conditions, resulting in low construction efficiency and significant safety hazards. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a synchronous tensioning and replacement device and construction method for highway bridge hangers, so as to solve the technical problems in the existing hanger replacement devices and construction methods that cannot achieve synchronous tensioning, have poor clamping and locking reliability, and are difficult to dynamically adjust according to the actual stress conditions, resulting in high safety risks to the bridge structure and uneven stress conversion during the construction process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a synchronous tensioning and replacement device and construction method for highway bridge hangers, comprising a top fixing unit including a T-shaped connecting beam, the top of which is fixed to the beam at the top of the bridge via a connecting plate; inclined plates symmetrically arranged on both sides of the connecting beam; a pair of cable reels symmetrically arranged on both sides of the top of the connecting beam; an opening corresponding to the cable reels on the connecting beam; and a connecting sleeve fitted on the side of the inclined plate away from the connecting beam; and a bottom fixing unit including a fixing beam laterally connected to the bridge rib. A pair of clamping plates are symmetrically arranged at both ends of the beam. The fixed beam has a fixing port for installing the clamping plates. The clamping plates are provided with multiple fixing anchors for fixing the clamping plates inside the fixed beam. An installation block is connected to the end of the clamping plate away from the fixed beam. A connection port is opened on the side of the installation block away from the fixed beam. A guide port is opened on the top of the installation block. The guide port is connected to the connection port. A temporary fixing frame is connected to the top of the guide port. The other end of the temporary fixing frame is inserted into the connecting sleeve to realize a temporary connection between the top fixing unit and the bottom fixing unit.

[0007] The present invention is further configured such that a rotating shaft is provided at the top of the temporary fixing frame, and a pair of telescopic cylinders are symmetrically arranged on the side of the inclined plate near the temporary fixing frame and on the side of the connecting sleeve. The telescopic cylinders are connected to the rotating shaft and are used to push the temporary fixing frame to adjust the force.

[0008] The invention is further configured such that the clamping plate is provided with a clamping device for clamping the boom, the clamping device including a channel for the boom to pass through, a pair of rotating shafts symmetrically arranged on the upper and lower sides of the channel, a rotating shaft is provided in the clamping plate in cooperation with the rotating shaft, the rotating shaft can rotate around the rotating shaft, and a threaded shaft is also provided in the clamping plate in cooperation with the rotating shaft, when the rotating shaft rotates in one direction, it can move along the direction of the threaded shaft to lock the boom.

[0009] The present invention is further configured such that side plates are symmetrically arranged on the top of both sides of the fixed beam, and the side plates are provided with multiple mounting holes for fixing the side plates to the bridge ribs and simultaneously fixing the fixed beam.

[0010] The construction method for synchronous tensioning and replacing suspenders on highway bridges includes the following steps: The top fixing unit is fixed to the beam at the top of the bridge via a connecting plate; the bottom fixing unit is laterally fixed to the bridge rib via a fixing beam and positioned using clamping plates and fixing anchors; one end of the temporary fixing frame is inserted into the connecting sleeve, and the other end is connected to the guide opening of the installation block; the suspender is inserted through the connecting opening, enters the temporary fixing frame through the guide opening, and then exits through the opening to the cable reel; the suspender is tightened using the cable reel to form a temporary suspender; the force is adjusted by pushing the temporary fixing frame with a telescopic cylinder according to the stress condition of a single section of the bridge; the suspender is unidirectionally locked using the clamping device within the clamping plate, completing the tensioning and replacement of the suspender.

[0011] In summary, the present invention has the following main beneficial effects: This invention achieves synchronous tensioning and reliable unidirectional locking of the suspension rods through the cooperation of the winding device in the top fixing unit and the clamping plate and internal one-way locking mechanism in the bottom fixing unit. This effectively avoids safety hazards such as suspension rod slippage, loosening, and sudden changes in local stress on the bridge caused by replacing rods one by one or unreliable clamping in traditional construction. At the same time, by using the telescopic cylinder set on the inclined plate and connecting it to the rotating shaft at the top of the temporary fixing frame, the temporary fixing frame can be dynamically and precisely adjusted according to the actual stress of a single section of the bridge. This overcomes the shortcomings of existing technologies that cannot adjust the stress in real time and accurately, thereby ensuring the smoothness and coordination of the stress transition between the old and new suspension rods, improving construction efficiency and the safety of the bridge structure. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Another perspective illustration; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a partial structural side view of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0013] In the diagram: 1. Connecting beam; 2. Connecting plate; 3. Winding reel; 4. Opening; 5. Connecting sleeve; 6. Inclined plate; 7. Temporary fixing frame; 8. Fixing beam; 9. Clamping plate; 10. Fixing anchor; 11. Connecting port; 12. Mounting block; 13. Telescopic cylinder; 14. Rotating shaft; 15. Rotating shaft; 16. Side plate; 17. Mounting port; 18. Fixing port; 19. Guide port; 20. Threaded shaft; 21. Temporary lifting rod. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0015] The embodiments of the present invention will now be described.

[0016] The synchronous tensioning and replacement device and construction method for highway bridge hangers are shown in Figure 1-5, which includes two main parts: the top fixing unit and the bottom fixing unit.

[0017] The top fixing unit is used to secure the beam at the top of the bridge. Specifically, the top fixing unit includes a T-shaped connecting beam 1. The convex end of the connecting beam 1 faces upward, that is, the vertical part of the T-shape faces downward and the horizontal part faces upward. The top of the connecting beam 1, i.e., the upper surface of the horizontal part of the T-shape, is fixed to the beam at the top of the bridge by a connecting plate 2. The connecting plate 2 can be connected to the beam at the top of the bridge by high-strength bolts or welding, thereby reliably suspending the entire connecting beam 1 at the top of the bridge.

[0018] On both sides of the connecting beam 1, inclined plates 6 are symmetrically arranged. The inclined plates 6 are arranged at a certain inclination, and the inclination angle is determined according to the actual angle between the fixing points of the top and bottom hangers of the bridge, so as to ensure that the force direction of the hangers is consistent with or close to the axial direction of the inclined plates 6, and to avoid generating additional lateral forces.

[0019] A pair of cable reels 3 are symmetrically arranged on both sides of the top of the connecting beam 1. The cable reels 3 can be manual or electric winches, used to tighten or release temporary suspension rods during construction. To facilitate the use of the cable reels 3, openings 4 are provided on the connecting beam 1 corresponding to the positions of the cable reels 3, through which the temporary suspension rods can pass and connect to the cable reels 3.

[0020] A connecting sleeve 5 is provided on the side of the inclined plate 6 away from the connecting beam 1, i.e., at the lower end or outer side of the inclined plate 6. The connecting sleeve 5 is used to insert and cooperate with the upper end of the temporary fixing frame 7 in the bottom fixing unit to achieve a temporary connection between the top and the bottom.

[0021] The bottom fixing unit includes a fixing beam 8. The fixing beam 8 is laterally connected to the bridge rib, that is, arranged along the transverse direction of the bridge, and fixed to the rib plate or web plate of the bridge. A pair of clamping plates 9 are symmetrically arranged at both ends of the fixing beam 8. In order to realize the detachable connection between the clamping plates 9 and the fixing beam 8, a fixing opening 18 is provided on the fixing beam 8, and one end of the clamping plate 9 is inserted into the fixing opening 18.

[0022] Multiple fixing anchors 10 are provided on the clamping plate 9. The fixing anchors 10 can be bolts, pins or wedge locking structures, used to firmly fix the clamping plate 9 inside the fixing beam 8 and prevent the clamping plate 9 from shifting relative to the fixing beam 8 during construction.

[0023] A mounting block 12 is connected to the end of the clamping plate 9 furthest from the fixing beam 8, i.e., the outer end of the clamping plate 9. The mounting block 12 can be a separate metal block, welded to the clamping plate 9 or integrally formed. A connection port 11 is provided on the outer side of the mounting block 12 furthest from the fixing beam 8. At the same time, a guide port 19 is provided on the top of the mounting block 12, and the guide port 19 and the connection port 11 are connected inside the mounting block 12 to form a through channel.

[0024] A temporary fixing frame 7 is connected to the top of the guide port 19. The temporary fixing frame 7 can be a hollow tube or rod-shaped structure, with its lower end fixed to the guide port 19 and its upper end inserted into the connecting sleeve 5 of the top fixing unit, thereby achieving a temporary connection between the top fixing unit and the bottom fixing unit. The interior of the temporary fixing frame 7 is hollow, for the installation of a temporary hanging rod.

[0025] In actual use, the operator inserts the temporary boom into the connection port 11 on the mounting block 12. The temporary boom passes upward through the guide port 19, then enters the internal channel of the temporary fixing frame 7, continues upward through the inclined plate 6 and the opening 4 on the connecting beam 1, and finally connects to the reel 3 at the top of the connecting beam 1. By tightening the temporary boom with the reel 3, a temporary hanger structure can be formed, allowing the original boom to be unloaded and replaced.

[0026] Based on the above structure, in order to dynamically adjust the tension of the temporary suspenders according to the actual stress conditions of a single bridge section during construction, this embodiment also includes a stress adjustment mechanism. Specifically, a rotating shaft 15 is provided at the top of the temporary fixing frame 7. On the side of the inclined plate 6 near the temporary fixing frame 7, located on the side of the connecting sleeve 5, a pair of telescopic cylinders 13 are symmetrically arranged. The telescopic cylinders 13 can be hydraulic cylinders or electric push rods, and their telescopic ends are connected to the rotating shaft 15. When the telescopic cylinders 13 extend or retract, they push the temporary fixing frame 7 to swing slightly around its bottom fulcrum, such as the connection point with the guide port 19, thereby changing the direction of force or the tightness of the temporary suspenders, achieving precise adjustment according to the actual stress conditions.

[0027] To prevent the temporary suspension rod from slipping accidentally during tensioning, this embodiment also includes a clamping device inside the clamping plate 9 for clamping the temporary suspension rod. This clamping device includes a channel through which the temporary suspension rod passes, the channel being axially oriented along the clamping plate 9. A pair of rotating shafts 14 are symmetrically arranged on the upper and lower sides of the channel. The rotating shafts 14 can be understood as eccentric rollers or one-way bearings. A rotating shaft 15 is provided inside the clamping plate 9 to cooperate with the rotating shafts 14, allowing the rotating shafts 14 to rotate freely around the rotating shaft 15. Furthermore, a threaded shaft 20 is also provided inside the clamping plate 9 to cooperate with the rotating shaft 15. When the temporary suspension rod is tensioned upwards, the rotating shaft 14 rotates in one direction, such as clockwise, under the action of friction. At this time, the threaded shaft 20 does not have a locking effect. Once the temporary suspension rod tends to slide downwards, the rotating shaft 14 will rotate in the opposite direction, such as counterclockwise. At this time, under the action of the threaded shaft 20, the rotating shaft 14 will move along the axial direction of the threaded shaft 20, thereby further pressing the temporary suspension rod and achieving one-way self-locking of the temporary suspension rod. This structure, in conjunction with the cable reel 3, can simultaneously fix the temporary suspension rod from both the top and bottom, greatly improving construction safety.

[0028] To enhance the connection stability between the entire bottom fixing unit and the bridge rib, this embodiment also symmetrically provides side plates 16 on the top of both sides of the fixing beam 8. The side plate 16 can be an L-shaped or flat structure. Each side plate 16 has multiple mounting holes 17, which can be bolt holes or welding grooves. The side plate 16 can be fixed to the bridge rib by bolts or welding through the mounting holes 17. At the same time, since the side plate 16 is fixedly connected to the fixing beam 8, for example, by integral molding or welding, the fixing beam 8 is also indirectly and firmly fixed to the bridge rib, preventing the fixing beam 8 from shaking or shifting during construction.

[0029] This embodiment also provides a construction method for synchronous tensioning and replacement of highway bridge hangers based on the above-mentioned device, which specifically includes the following steps: The first step is to fix the top fixing unit to the beam at the top of the bridge using the connecting plate 2. The operator first determines the lifting point position on the beam at the top of the bridge, and then fixes the connecting plate 2 to the beam using high-strength bolts or welding to ensure that the connecting beam 1 is horizontal and firm.

[0030] The second step is to fix the bottom fixing unit laterally to the bridge rib via the fixing beam 8, and to position it using the clamping plate 9 and the fixing anchor 10. Specifically, the fixing beam 8 is placed at the predetermined position on the bridge rib, one end of the clamping plate 9 is inserted into the fixing port 18 of the fixing beam 8, and then the fixing anchor 10 is tightened or hammered in, so that the clamping plate 9 and the fixing beam 8 become one unit.

[0031] Third, insert one end of the temporary fixing bracket 7 into the connecting sleeve 5, and connect the other end to the guide port 19 of the mounting block 12. At this time, the temporary fixing bracket 7 becomes a temporary channel connecting the top and bottom.

[0032] Fourth, insert the temporary boom through connection port 11, pass through guide port 19 into temporary fixing frame 7, and then lead it out through opening 4 to reel 3. The operator inserts the new temporary boom along this path, ensuring that the temporary boom passes smoothly through all channels.

[0033] Fifth, tighten the temporary suspension rod using the cable reel 3 to form a temporary suspension frame. The operator starts the cable reel 3 to gradually apply force to the temporary suspension rod until the original suspension rod is completely unloaded.

[0034] The sixth step involves adjusting the stress on the temporary fixing frame 7 by using the telescopic cylinder 13 to adjust the stress on each section of the bridge, based on the stress conditions of that section. Operators observe bridge deformation or force sensor data and control the telescopic cylinder 13 to extend or retract, ensuring the tension of the temporary suspension rod meets design requirements.

[0035] Step 7: The temporary boom is unidirectionally locked using the clamping device within clamping plate 9. Once the temporary boom reaches the set tension, the unidirectional self-locking characteristic of the clamping device prevents it from sliding downwards, thus achieving reliable locking. This completes the tensioning and replacement of the boom.

[0036] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A device for the synchronous tensioning replacement of highway bridge hangers, characterised in that, include: The top fixing unit includes a T-shaped connecting beam (1), the top of which is fixed to the beam at the top of the bridge by a connecting plate (2). Inclined plates (6) are symmetrically arranged on both sides of the connecting beam (1). A pair of cable reels (3) are symmetrically arranged on both sides of the top of the connecting beam (1). An opening (4) is provided on the connecting beam (1) corresponding to the cable reel (3). A connecting sleeve (5) is provided on the side of the inclined plate (6) away from the connecting beam (1). The bottom fixing unit includes a fixing beam (8), which is laterally connected to the bridge rib. A pair of clamping plates (9) are symmetrically arranged at both ends of the fixing beam (8). The fixing beam (8) has a fixing port (18) for installing the clamping plate (9). The clamping plate (9) has multiple fixing anchors (10) for fixing the clamping plate (9) inside the fixing beam (8). The end of the clamping plate (9) away from the fixing beam (8) is connected to an installation block (12). The side of the installation block (12) away from the fixing beam (8) has a connection port (11). The top of the installation block (12) has a guide port (19). The guide port (19) is connected to the connection port (11). The top of the guide port (19) is connected to a temporary fixing frame (7). The other end of the temporary fixing frame (7) is inserted into the connecting sleeve (5) to achieve a temporary connection between the top fixing unit and the bottom fixing unit.

2. The highway bridge boom synchronous tension replacement device according to claim 1, characterized in that: The top of the temporary fixing frame (7) is provided with a rotating shaft (15). A pair of telescopic cylinders (13) are symmetrically arranged on the side of the inclined plate (6) near the temporary fixing frame (7) and on the side of the connecting sleeve (5). The telescopic cylinders (13) are connected to the rotating shaft (15) and are used to push the temporary fixing frame (7) to adjust the force.

3. The highway bridge boom synchronous tension replacement device according to claim 1, characterized in that: The clamping plate (9) is provided with a clamping device for clamping the temporary boom (21). The clamping device includes a channel through which the temporary boom (21) passes. A pair of rotating shafts (14) are symmetrically arranged on the upper and lower sides of the channel. A rotating shaft (15) is provided in the clamping plate (9) in cooperation with the rotating shafts (14). The rotating shaft (14) can rotate around the rotating shaft (15). A threaded shaft (20) is also provided in the clamping plate (9) in cooperation with the rotating shaft (15). When the rotating shaft (14) rotates in one direction, it can move along the direction of the threaded shaft (20) to lock the temporary boom (21).

4. The highway bridge boom synchronous tension replacement device according to claim 1, characterized in that: The fixed beam (8) has symmetrical side plates (16) on its top sides. The side plates (16) have multiple mounting holes (17) for fixing the side plates (16) to the bridge rib and simultaneously fixing the fixed beam (8).

5. A method for synchronous tensioning replacement construction of a highway bridge boom based on the device according to any one of claims 1 to 4, characterized in that, Includes the following steps: The top fixing unit is fixed to the beam at the top of the bridge via the connecting plate (2); The bottom fixing unit is laterally fixed to the bridge rib by the fixing beam (8) and positioned by the clamping plate (9) and the fixing anchor (10); Insert one end of the temporary fixing bracket (7) into the connecting sleeve (5), and connect the other end to the guide port (19) of the mounting block (12); Insert the temporary boom (21) through the connection port (11), through the guide port (19) into the temporary fixing frame (7), and then lead it out through the opening (4) to the reel (3). The temporary hanger (21) is tightened by the reel (3) to form a temporary hanger; According to the stress condition of a single section of the bridge, the stress is adjusted by pushing the temporary fixing frame (7) through the telescopic cylinder (13); The temporary boom (21) is unidirectionally locked by the clamping device in the clamping plate (9), and the tensioning and replacement of the boom is completed.

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