Device for adjusting stress of top pushing guide beam and downwarping deformation of cantilever end and guide beam

Abstract

The utility model relates to the technical field of bridge construction, in particular to a device for adjusting stress of a top pushing guide beam and downwarping deformation of a cantilever end and a guide beam, the guide beam is installed at one end of the main beam, and a positioning tensioning mechanism is installed between the top of the main beam and the top of the guide beam. The positioning tensioning mechanism comprises a fixed cross beam, a hydraulic jack, a tensioning assembly, a butt joint assembly and a positioning assembly, the fixed cross beam is installed at one end of the top of the main beam, the tensioning assembly is used for tensioning the guide beam steel beam, and the butt joint assembly is used for rapidly locking or unlocking the positioning assembly; the positioning assembly is used for positioning after the guide beam steel beam is tensioned in place; the guide beam steel beam is tensioned and anchored in real time, so that stress of the guide beam and down-warping of the cantilever end are controlled and adjusted, the problems that pier climbing is difficult and hogging moment of the root of the guide beam is too large due to the fact that down-warping of the cantilever end of the guide beam is large in the pushing process can be effectively solved, and bridge pushing construction efficiency and safety can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, specifically to a device for adjusting the stress on the top-pushing guide beam and the downward deflection deformation of the cantilever end, and the guide beam. Background Technology

[0002] The incremental launching method is one of the most widely used construction methods for erecting main girders in bridge construction, often used for bridges spanning busy waterways, highways, and railways. During the incremental launching of long-span bridges, a guide beam is typically installed at the front end of the main girder to effectively reduce the peak negative bending moment at the front support point. However, due to its own weight, the guide beam is in a large cantilever state before being placed on the front support pier, resulting in a huge negative bending moment at the root section of the guide beam. Simultaneously, the front end of the guide beam experiences significant downward deflection before being placed on the pier, causing the bottom surface of the guide beam's front end to be lower than the height of the pad on the front support pier, making it impossible to directly place it on the front support pier. Currently, in order to resist the huge negative bending moment generated at the root section of the guide beam, the method of increasing the cross-section and height of the guide beam is generally adopted, which increases the material consumption of the guide beam. At the same time, in order to solve the problem of guide beams being placed on piers during bridge jacking construction, the main methods used include installing cable towers to lift the beam ends, using arc-shaped guide beams, and stepped guide beams. Among them, stepped guide beams require manual padding to complete the placement of the guide beam on the pier. When the guide beam deflects significantly, repeated padding is required, which consumes a lot of manpower and time.

[0003] Chinese Patent 202310674254.0 discloses a device and method for controlling the downward deflection deformation of the cantilever end of a jacking guide beam. The method includes a winch, an anchoring device, a guide block, a tensioning steel bundle, a laser emitter, and a laser receiver. The method achieves tensioning of the cantilever end of the guide beam by connecting the winch and the anchoring device with the tensioning steel bundle. By installing the laser emitter and laser receiver, the height position of the cantilever end of the guide beam is monitored in real time. This allows for real-time control of the winch's operation of the tensioning steel bundle based on the real-time height position of the cantilever end of the guide beam, thereby controlling and adjusting the downward deflection deformation. The method is convenient and highly accurate, avoiding the problems of insufficient support for the downward deflection stress and poor support stability in existing technologies using local reinforcement components. It effectively solves the problem of difficulty in passing the guide beam against the pier due to large downward deflection deformation of the cantilever end of the guide beam during the jacking process of the main beam, and can effectively improve the efficiency of the main beam jacking construction.

[0004] This method also has the following drawbacks: 1. This method achieves tensioning of the steel strand by rotating the winch forward and backward. This makes it difficult to precisely control the tension force and elongation, and it is also difficult to maintain a stable tension in the steel strand. 2. Repeated forward and reverse rotation of the winch can easily cause damage to the steel strand. 3. The forward and reverse rotation of the winch can only tension smaller tonnage wire ropes, providing relatively small tension forces, and is not suitable for tensioning large-span, large-tonnage steel strands. Therefore, it is urgent to design a device for adjusting the stress on the top-pushing guide beam and the downward deflection deformation at the cantilever end, as well as a guide beam, to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a device and guide beam for adjusting the stress on the top-pushing guide beam and the downward deflection at the cantilever end, in order to solve the problems mentioned in the background art. This method achieves tensioning of the steel strand through the forward and reverse rotation of a winch. This method makes it difficult to precisely control the tension force and elongation, and it is also difficult to maintain a stable tension in the steel strand. Furthermore, the tension force provided by the winch is relatively small, and repeated forward and reverse rotations of the steel strand can easily cause damage. Therefore, there is an urgent need to design a device and guide beam for adjusting the stress on the top-pushing guide beam and the downward deflection at the cantilever end to solve the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A device for adjusting the stress on a top-pushing guide beam and the downward deflection at the cantilever end, and a guide beam, comprising a main beam, a guide beam installed at one end of the main beam, and a positioning tensioning mechanism installed between the top of the main beam and the top of the guide beam. The positioning tensioning mechanism includes a fixed crossbeam, a tensioning component, a docking component, and a positioning component. The fixed crossbeam is installed at the top end of the main beam. The tensioning component is used to tension the guide beam steel strands. The docking component is used to quickly lock or unlock the positioning component. The positioning component is used to position the guide beam steel strands after they have been tensioned into place.

[0008] As a preferred embodiment of this utility model, the positioning component includes multiple sets of screws slidably connected inside the fixed crossbeam. A rear crossbeam is installed at one end of the screw, and a front crossbeam is installed at the other end of the screw. A steel bundle is installed between the front end of the front crossbeam and the front end of the guide beam. A hydraulic jack is embedded in the center of the fixed crossbeam, and the output end of the hydraulic jack is fixedly connected to one side of the rear crossbeam.

[0009] As a preferred embodiment of this utility model, a fixing frame is installed on the top of the fixing beam, and nuts are threaded to both ends of the outer sides of the two sets of screws. A first bevel gear is installed on one side of the nut, and a second bevel gear is meshed with one side of the first bevel gear. A drive rod is installed at one end of the second bevel gear. Sliding seats are installed on both sides of the outer wall of the fixing frame. A sliding groove is opened on the inner side of the sliding seat, and a sliding block is slidably connected to the inner side of the sliding groove. The cross-section of the sliding block and the sliding groove are both T-shaped. The top end of the drive rod is fixedly connected to the bottom end of the sliding block. A first motor is installed on the top end of the sliding block, and the drive end of the first motor extends into the interior of the sliding block and is fixedly connected to one end of the drive rod.

[0010] As a preferred embodiment of this utility model, the tensioning assembly includes a steering device installed on the top of the main beam on one side of the fixed crossbeam. A rotating wheel is rotatably connected to the inner side of the steering device, and one side of the steel strand is in contact with the outer wall of the rotating wheel.

[0011] As a preferred embodiment of this utility model, the docking assembly includes an overlap seat installed at the bottom of the fixed frame, and an overlap groove is provided at the top center of the fixed crossbeam. The overlap seat and the overlap groove are slidably connected.

[0012] As a preferred embodiment of this utility model, a pressure block is installed at one bottom end of the overlapping seat, a pressure groove is formed inside the overlapping groove on the inner wall of the fixed crossbeam, the pressure groove and the pressure block are slidably connected, a reset groove is formed inside the fixed crossbeam on one side of the pressure groove, a reset plate is slidably connected inside the reset groove, and reset springs are installed between the two ends of one side of the reset plate and the inner wall of the reset groove.

[0013] As a preferred embodiment of this utility model, a pull rod is installed on one side of the reset plate between two sets of reset springs. The pull rod is slidably connected to the fixed crossbeam. A pull ring is installed at one end of the pull rod extending to the outside of the fixed crossbeam. The opposite ends of the pressure block and the reset plate are provided with mutually fitting inclined surfaces. The output end of the hydraulic jack is fixedly connected to one side of the rear crossbeam.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, the tensioning component tensions the guide beam steel strands, and the docking component quickly locks or unlocks the positioning component. The positioning component positions the guide beam steel strands after they are tensioned into place, allowing for real-time tensioning and anchoring. This enables control and adjustment of the stress on the guide beam and the deflection at the cantilever end, effectively solving the problems of difficulty in pier mounting and excessive negative bending moment at the root of the guide beam caused by large deflection at the cantilever end during the jacking process. This significantly improves the efficiency and safety of bridge jacking construction. This invention has a simple structure and is easy to operate. The tensioning and anchoring process does not damage the steel strands, allowing for reuse. The positioning component can be quickly removed and placed, facilitating timely installation, maintenance, or replacement by workers, ensuring the effective operation of the components and further enhancing the practicality of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of a partial structure of the top beam of this utility model;

[0018] Figure 3 This is a three-dimensional structural diagram of the fixed crossbeam and hydraulic jack of this utility model;

[0019] Figure 4 This is a partial cross-sectional view of the docking assembly of this utility model.

[0020] In the diagram: 1. Main beam; 2. Guide beam; 3. Fixed crossbeam; 4. Hydraulic jack; 5. Screw; 6. Rear crossbeam; 7. Steel strand; 8. Fixing frame; 9. Nut; 10. First bevel gear; 11. Second bevel gear; 12. First motor; 13. Steering device; 14. Overlap seat; 15. Pressure block; 16. Reset plate; 17. Reset spring; 18. Tie rod; 19. Sliding seat; 20. Sliding block; 21. Front crossbeam. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Example

[0022] Please see Figures 1-4 This utility model provides a technical solution:

[0023] A device for adjusting the stress on a top-pushing guide beam and the downward deflection at the cantilever end, and a guide beam, are disclosed. The device includes a main beam 1, with a guide beam 2 installed at one end of the main beam 1. A positioning tensioning mechanism is installed between the top of the main beam 1 and the top of the guide beam 2. The positioning tensioning mechanism includes a fixed crossbeam 3, a tensioning component, a docking component, and a positioning component. The fixed crossbeam 3 is installed at the top end of the main beam 1. The tensioning component is used to tension the guide beam steel strands 7. The docking component is used to quickly lock or unlock the positioning component. The positioning component is used to position the guide beam steel strands 7 after tensioning them into place. In use, the device can tension the guide beam steel strands 7 using the tensioning component, quickly lock or unlock the positioning component using the docking component, and position the guide beam steel strands 7 after tensioning them into place. The device has a simple structure, is easy to operate, does not damage the steel strands 7 during tensioning and anchoring, and allows for quick removal and placement of the positioning component, enabling timely installation, maintenance, or replacement by personnel. This ensures the operational effectiveness of the components and further improves the practicality of the device.

[0024] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the positioning assembly includes multiple sets of screws 5 slidably connected inside the fixed crossbeam 3. A rear crossbeam 6 is mounted at one end of each screw 5, and a front crossbeam 21 is mounted at the other end. A steel strand 7 is installed between the front crossbeam 21 and the front end of the guide beam 2. A hydraulic jack 4 is embedded in the center of the fixed crossbeam 3. The output end of the hydraulic jack 4 is fixedly connected to one side of the rear crossbeam 6. First, the steel strand 7 connects the guide beam 2 and the main beam 1. When the cantilever end of the guide beam 2 experiences significant downward deflection, the hydraulic jack 4 can be activated to retract the rear crossbeam 6. The rear crossbeam 6, in conjunction with the screws 5, can move the front crossbeam 21 and the steel strand 7 back. A rotating wheel can provide auxiliary guidance when the steel strand 7 moves. The other end of the steel strand 7 can pull up the guide beam 2, thereby improving the stress on the guide beam and reducing the downward deflection at its cantilever end. After the guide beam 2 is placed on the pier, the hydraulic jack 4 moves the rear crossbeam 6, causing the steel strand 7 to relax, releasing or reducing the tension applied to the bridge.

[0025] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, a fixing frame 8 is installed on the top of the fixed beam 3. Nuts 9 are threaded to both ends of the outer sides of the two sets of screws 5. A first bevel gear 10 is installed on one side of the nut 9. A second bevel gear 11 is meshed with one side of the first bevel gear 10. A drive rod is installed on one end of the second bevel gear 11. Sliding seats 19 are installed on both sides of the outer wall of the fixing frame 8. A sliding groove is opened on the inner side of the sliding seat 19. A sliding block 20 is slidably connected to the inner side of the sliding groove. The cross-section of the sliding block 20 and the sliding groove are both T-shaped. The top end of the drive rod is fixedly connected to the bottom end of the sliding block 20. A first motor 12 is installed on the top end of the sliding block 20. The drive end of the first motor 12 extends into the interior of the sliding block 20 and... One end of the drive rod is fixedly connected. After it moves into place, the first motor 12 can be started to drive the drive rod and the second bevel gear 11 at its bottom to rotate. The first bevel gear 10, which meshes with the second bevel gear 11, also rotates and drives the nut 9 to slide on the outside of the screw 5. The first motor 12 can cooperate with the sliding block 20 to move on the inside of the sliding groove at one end of the nut 9 until the nuts 9 on both sides are attached to the outer wall of the fixed crossbeam 3, locking the screw 5 again, strengthening the positioning effect and reducing the force on the hydraulic jack 4. When performing tensioning operation, the first motor 12 can be started to drive the nut 9 to flexibly adjust its position to avoid interfering with the pushing of the hydraulic jack 4.

[0026] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, the tensioning assembly includes a steering device 13 installed on the top of the main beam 1, located on one side of the fixed crossbeam 3. The steering device 13 mainly provides steering support for the steel strands 7. It can be directly set as a steering block, or a wheel can be rotatably connected to the inner side of the steering device 13. One side of the steel strand 7 is in contact with the outer wall of the wheel. A pressure block 15 is installed at one end of the bottom of the lap joint 14. A pressure groove is formed inside the fixed crossbeam 3 on the inner wall of the lap joint groove. The pressure groove and the pressure block 15 are slidably connected. A reset groove is formed inside the fixed crossbeam 3 on one side of the pressure groove. A reset plate 16 is slidably connected to the inner side of the positioning groove. Reset springs 17 are installed between the two ends of one side of the reset plate 16 and the inner wall of the reset groove. Further, the overlapping seat 14 is placed on the inner side of the overlapping groove, and the pressure block 15 slides into the inner side of the pressure groove. The pressure block 15 contacts the reset plate 16, and the inclined surfaces of the two abut against each other, forcing the reset plate 16 to squeeze the two sets of reset springs 17 to retract. After the pressure block 15 is fully pushed in, the reset springs 17 can drive the reset plate 16 to pop out and abut against the protruding end of the pressure block 15, locking the position of some components of the positioning assembly.

[0027] In this embodiment, as Figure 1 , Figure 3 and Figure 4As shown, a pull rod 18 is installed on one side of the reset plate 16 between the two sets of reset springs 17. The pull rod 18 is slidably connected to the fixed crossbeam 3. A pull ring is installed at one end of the pull rod 18 extending to the outside of the fixed crossbeam 3. The opposite ends of the pressure block 15 and the reset plate 16 are provided with mutually fitting inclined surfaces. Furthermore, when it is necessary to repair or replace the components of the positioning assembly, the pull ring can be fastened to drive the pull rod 18 to slide inside the fixed crossbeam 3, thereby driving the reset plate 16 to actively squeeze the two sets of reset springs 17. After the reset plate 16 moves away from the protruding end of the pressure block 15, the lap seat 14 and some components on the positioning assembly can be separated together for repair and replacement.

[0028] The implementation principle of the device for adjusting the stress on the top-pushing guide beam and the downward deflection of the cantilever end in this embodiment of the application is as follows: The steel strand 7 connects the guide beam 2 and the main beam 1. When the guide beam 2 deflects significantly, the hydraulic jack 4 can be activated to drive the rear crossbeam 6 to retract. The rear crossbeam 6, in conjunction with the screw 5, can drive the front crossbeam 21 and the steel strand 7 to move back. The rotating wheel can provide auxiliary guidance when the steel strand 7 moves. The other end of the steel strand 7 can pull up the guide beam 2, improving the stress on the guide beam and the downward deflection of its cantilever end. After moving into position, the first motor 12 can be activated to drive the drive rod and the second bevel gear 11 at its bottom to rotate, causing the first bevel gear 10, which meshes with the second bevel gear 11, to also rotate, and drive the nut 9 to slide on the outside of the screw 5. The first motor 12, in conjunction with the sliding block 20, can move simultaneously on one end of the nut 9 and on the inside of the sliding groove until the nuts 9 on both sides are attached to the outer wall of the fixed crossbeam 3, locking the screw 5 again and strengthening the positioning. This method effectively reduces the stress on the hydraulic jack 4. During tensioning operations, the first motor 12 can be started to drive the nut 9 to flexibly adjust its position, avoiding interference with the pushing of the hydraulic jack 4. The overlapping seat 14 is placed inside the overlapping groove, allowing the pressure block 15 to slide into the pressure groove. The pressure block 15 contacts the reset plate 16, and their inclined surfaces abut against each other, forcing the reset plate 16 to squeeze the two sets of reset springs 17 to retract. After the pressure block 15 is fully pushed in, the reset springs 17 can drive the reset plate 16 to pop out and abut against the protruding end of the pressure block 15, locking the position of some parts of the positioning component. When it is necessary to inspect or replace the parts of the positioning component, the pull ring can be fastened to drive the pull rod 18 to slide inside the fixed crossbeam 3, causing the reset plate 16 to actively squeeze the two sets of reset springs 17. After the reset plate 16 moves away from the protruding end of the pressure block 15, the overlapping seat 14 and some parts of the positioning component can be separated for inspection and replacement.

[0029] The control method of this utility model is through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for adjusting the stress on the top-pushing guide beam and the downward deflection at the cantilever end, and a guide beam, comprising a main beam (1), characterized in that: A guide beam (2) is installed at one end of the main beam (1). A positioning tensioning mechanism is installed between the top of the main beam (1) and the top of the guide beam (2). The positioning tensioning mechanism includes a fixed crossbeam (3), a tensioning component, a docking component, and a positioning component. The fixed crossbeam (3) is installed at the top end of the main beam (1). The tensioning component is used to tension the guide beam steel strand (7). The docking component is used to quickly lock or unlock the positioning component. The positioning component is used to position the guide beam steel strand (7) after it has been tensioned into place.

2. The device for adjusting the force on the top-pushing guide beam and the downward deflection at the cantilever end, and the guide beam according to claim 1, characterized in that: The positioning assembly includes multiple sets of screws (5) slidably connected inside the fixed crossbeam (3). One end of the screw (5) is equipped with a rear crossbeam (6), and the other end of the screw (5) is equipped with a front crossbeam (21). A steel bundle (7) is installed between the front crossbeam (21) and the front end of the guide beam (2). A hydraulic jack (4) is embedded in the center of the fixed crossbeam (3), and the output end of the hydraulic jack (4) is fixedly connected to one side of the rear crossbeam (6).

3. The device for adjusting the force on the top-pushing guide beam and the downward deflection at the cantilever end, and the guide beam according to claim 2, characterized in that: A fixing frame (8) is installed on the top of the fixed beam (3). Nuts (9) are threaded to both ends of the two sets of screws (5). A first bevel gear (10) is installed on one side of the nut (9). A second bevel gear (11) is meshed with one side of the first bevel gear (10). A drive rod is installed at one end of the second bevel gear (11). Sliding seats (19) are installed on both sides of the outer wall of the fixing frame (8). A sliding groove is opened on the inner side of the sliding seat (19). A sliding block (20) is slidably connected to the inner side of the sliding groove. The cross section of the sliding block (20) and the sliding groove are both T-shaped. The top end of the drive rod is fixedly connected to the bottom end of the sliding block (20). A first motor (12) is installed on the top end of the sliding block (20). The drive end of the first motor (12) extends into the interior of the sliding block (20) and is fixedly connected to one end of the drive rod.

4. The device for adjusting the force on the top-pushing guide beam and the downward deflection at the cantilever end, and the guide beam according to claim 3, characterized in that: The tensioning assembly includes a steering device (13) installed on the top of the main beam (1) on one side of the fixed crossbeam (3). The inner side of the steering device (13) is rotatably connected to a wheel, and one side of the steel strand (7) is in contact with the outer wall of the wheel.

5. The device for adjusting the force on the top-pushing guide beam and the downward deflection at the cantilever end, and the guide beam according to claim 4, characterized in that: The docking assembly includes an overlap seat (14) installed at the bottom of the fixed frame (8), and an overlap groove is provided at the top center of the fixed beam (3). The overlap seat (14) and the overlap groove are slidably connected.

6. The device for adjusting the force on the top-pushing guide beam and the downward deflection at the cantilever end, and the guide beam according to claim 5, characterized in that: A pressure block (15) is installed at one bottom end of the overlapping seat (14). A pressure groove is opened inside the overlapping groove of the fixed crossbeam (3). The pressure groove and the pressure block (15) are slidably connected. A reset groove is opened inside the pressure groove on one side of the fixed crossbeam (3). A reset plate (16) is slidably connected inside the reset groove. A reset spring (17) is installed between the two ends of one side of the reset plate (16) and the inner wall of the reset groove.

7. The device for adjusting the force on the top-pushing guide beam and the downward deflection at the cantilever end, and the guide beam according to claim 6, characterized in that: A pull rod (18) is installed on one side of the reset plate (16) between two sets of reset springs (17). The pull rod (18) is slidably connected to the fixed crossbeam (3). A pull ring is installed at one end of the pull rod (18) extending to the outside of the fixed crossbeam (3). The opposite ends of the pressure block (15) and the reset plate (16) are provided with mutually fitting inclined surfaces.

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