Curve beam bridge anti-overturning device using pulley block and adjusting rod

Abstract

The invention provides a curved beam bridge anti-overturning device utilizing a pulley block and an adjusting rod. The curved beam bridge anti-overturning device mainly comprises a steel strand, a fixed pulley, a movable pulley, a supporting rod, the adjusting rod, a steel sleeve, a limiting block, an anchor rod, an anchor ring, an anchoring block, a gasket, an anchor hole, a bolt, a hexagon head and a screw rod. By tensioning the steel strands and combining the pulley blocks, the device can effectively optimize force transmission in the beam body. Meanwhile, the arranged supporting rods can effectively restrain transverse displacement of the curved bridge and resist overturning moment of a single curved bridge. The two ends of the adjusting rod are connected with the supporting rod and the steel strand respectively, and efficient transmission and optimization of force between the supporting rod and the steel strand are achieved through the lever principle. When the curved bridge is subjected to eccentric load or dynamic load, the mutual connection of the structures can obviously optimize the force transmission in the bridge body and effectively restrain the transverse displacement of the bridge, so that the anti-overturning capability of the curved bridge is enhanced. The device provides an innovative solution for improving the safety of the curved bridge under the action of eccentric load or dynamic load.

Description

Technical Field

[0001] The invention belongs to the field of bridge engineering earthquake resistance and anti-overturning and disaster prevention and reduction, and specifically relates to a curved beam bridge anti-overturning device using a pulley block and an adjusting rod. Background Art

[0002] With the continuous advancement of urbanization, the limitations of space and geological and topographical conditions have led to the widespread application of curved bridges in cities and towns. Especially under complex road conditions, curved bridges have become an important choice in bridge engineering design due to their ability to effectively improve road utilization, disperse traffic flow and design flexibility. Among them, curved bridges are widely used in urban elevated bridges, overpasses and other engineering projects due to their simple structure and strong economy.

[0003] However, due to the unique geometric shape and support form of curved bridges, they are prone to lateral displacement and overturning under heavy loads and eccentric loads. Especially under the dynamic effects of high-speed vehicles, wind loads, and earthquakes, the stability, bearing capacity, and safety of the pier structure are obviously insufficient. Such deficiencies and limitations may not only cause the bridge to overturn, but also pose serious risks to driving safety, comfort, and the long-term use of the bridge structure.

[0004] Existing bridge designs mostly focus on improving vertical bearing capacity, but lack effective solutions to the anti-overturning problem caused by eccentric loads or dynamic loads. Common anti-overturning design methods include: adding auxiliary piers, adding cap beams and supports, implementing pier-beam consolidation or expanding the size of piers. Although these methods can enhance structural stability to a certain extent, they also have many problems, such as compressing the space under the bridge, increasing installation costs and making construction more difficult. In addition, a single reinforcement method has limited response capabilities and multi-dimensional force enhancement effects when dealing with dynamic load changes, and it is difficult to meet the requirements of modern bridges for high safety and high durability.

[0005] In engineering practice, force-saving structures (such as lever structures, pulley blocks, prestressed structures, etc.) are widely used. By changing the direction and amplitude of force, the force transmission can be optimized and the overall work efficiency can be significantly improved. The rational combination and application of these structures in bridge engineering can provide a new technical path for improving structural performance.

[0006] Fixed pulleys and movable pulleys have important application value in the field of civil engineering. The main advantage of fixed pulleys is that they can change the direction of force, making the lifting and moving of heavy objects more convenient, while movable pulleys improve efficiency by reducing the applied force. The combined use of the two not only improves construction efficiency and safety, but also optimizes the use of resources.

[0007] The advantage of leverage is that it can achieve a greater mechanical effect with a smaller force, greatly improving work efficiency and force conversion efficiency. In the field of civil engineering, it is widely used in lifting, bridge erection and structural support. Through ingenious design, it enhances structural stability and carrying capacity, ensuring the safe and efficient progress of the project.

[0008] Steel strands and prestressed cables significantly improve the bearing capacity, stability and durability of the structure through prestressing technology, and effectively reduce the occurrence of deformation and cracks. In addition, steel strands and prestressed cables can adjust the force distribution of the structure, enhance the anti-overturning and anti-seismic capabilities, and ensure the long-term safety of the project. At the same time, it can also reduce material consumption, reduce project costs, and improve the mechanical properties and overall coordination of the project structure under eccentric loads or dynamic loads (such as wind, earthquakes, etc.).

[0009] In response to the above-mentioned engineering problems, requirements and structural characteristics, this paper proposes an anti-overturning device for a curved beam bridge using a pulley block and an adjusting rod. The device effectively optimizes the force transmission path of the beam body by tensioning the steel strands in combination with the pulley block, and resists the overturning moment of the curved bridge by setting support rods. Specifically, the two ends of the adjusting rod are respectively connected to the support rod and the steel strand, thereby playing a lever role and realizing the effective transmission and optimization of the force between the support rod and the steel strand. When the curved bridge is subjected to eccentric loads or dynamic loads, the various structural units of the device cooperate with each other, which not only optimizes the transmission of the force in the beam body, but also effectively constrains the lateral displacement of the bridge, significantly enhancing the anti-overturning ability of the bridge.

[0010] This new anti-overturning device provides a new technical solution to solve the safety hazards of curved bridges under eccentric loads or dynamic loads. It has significant advantages such as convenient construction, high stability and superior economy. Summary of the invention

[0011] The purpose of the present invention is to propose an anti-overturning device for a curved beam bridge using a pulley block and an adjusting rod. The device can significantly adjust and optimize the internal force transmission of the beam body by tensioning the steel strands in combination with the pulley block; by setting the support rods, the overturning moment of the curved bridge can be effectively resisted. At the same time, the two ends of the adjusting rod are respectively connected to the support rods and the steel strands, and the lever principle is used to achieve efficient transmission and optimization of the force between the support rods and the steel strands. When the curved bridge is subjected to eccentric loads or dynamic loads, the various structural units in the device work together through interaction, which can not only effectively optimize the force distribution inside the beam body, but also effectively constrain the lateral displacement of the bridge, thereby significantly enhancing the anti-overturning ability of the curved bridge, thereby providing a new and efficient solution for the safety protection of bridge structures under eccentric loads or dynamic loads.

[0012] Technical solution: The present invention proposes an anti-overturning device for a curved beam bridge using a pulley block and an adjusting rod, which mainly comprises: a steel strand (1), a fixed pulley (2), a movable pulley (3), a support rod (4), an adjusting rod (5), a steel sleeve (6), a limit block (7), an anchor rod (8), an anchor ring (9), an anchor block (10), a gasket (11), an anchor hole (12), a bolt (13), a hexagonal head (14) and a screw rod (15).

[0013] Among them, multiple groups of steel strands (1) and support rods (4) are evenly arranged around the top of the bridge pier, and the angle between each group of steel strands (1) and support rods (4) and the tangent of the curved bridge in the horizontal direction ranges from 30° to 60°. The steel strands (1) can change the direction of the steel strands (1) through the cooperation of the fixed pulley (2) and the movable pulley (3), and can also adjust and optimize the force transmission path, thereby reducing the influence of the steel strands (1) on the lateral force of the bridge pier. At the same time, the support rods (4) provide sufficient support force or tension for the curved beam bridge, effectively restrain the lateral displacement of the bridge, and significantly enhance the anti-overturning force of the curved beam bridge. The top ends of the steel strand (1) and the support rod (4) are respectively connected to the anchor block (10) at the bottom of the flange and the anchor ring (9) at the bottom of the web of the curved beam bridge. The other ends of the steel strand (1), the fixed pulley (2) and the support rod (4) are connected to the adjustment rod (5). The fixed pulley (2) and the support rod (4) are hinged at both ends of the adjustment rod (5). The steel strand (1) is fixed to the adjustment rod (5). The adjustment rod (5) is hinged to the anchor rod (8) of the pier steel sleeve (6) to play a lever role, thereby realizing the effective transmission and optimization of the force between the support rod (4) and the steel strand (1). In addition, the steel strand (1) and the support rod (4) are provided with a limit block (7) on the projection of the steel sleeve (6) to limit the rotation angle of the adjustment rod (5). When the curved beam bridge is subjected to eccentric load or dynamic load, the interactive connection of the above structures can optimize the transmission of internal forces in the beam, effectively constrain the lateral displacement of the bridge, and significantly enhance the anti-overturning force of the curved beam bridge.

[0014] The diameter of the steel strand (1) is at least 15 mm, the tensile strength is at least 1200 MPa, and the maximum tension is at least 400 kN. The two ends of the steel strand (1) are respectively connected to the hinge between the adjustment rod (5) and the bridge pier and the flange bottom anchor block (10) close to the bridge web. During installation, pre-tensioning of not less than 5% of the maximum tension can optimize the force transmission in the beam of the curved bridge under the action of eccentric load, and provide appropriate tension when the curved bridge overturns, indirectly restraining the lateral displacement of the bridge, enhancing the anti-overturning force of the curved bridge, and combined with the fixed pulley (2) and the movable pulley (3), it can reduce the influence of the steel strand (1) on the lateral force of the bridge pier.

[0015] The fixed pulley (2) and a plurality of movable pulleys (3) form a pulley block, which is made of cast steel with good hardness and wear resistance, and includes pulleys of two sizes, the diameter of which should be 10 to 20 times that of the steel strand (1) to facilitate the winding of the steel strand (1). At the same time, the width and depth of the pulley groove should be greater than the diameter of the steel strand (1) to ensure the smooth running of the steel strand (1) between the pulleys. It is used to change the direction of the steel strand (1) and reduce the influence of the tensioning of the steel strand (1) on the lateral force of the bridge pier.

[0016] The support rod (4) is made of Q345 steel, and its diameter is usually not less than 1 / 20 of the bridge pier. Anchor holes (12) are reserved at both ends and connected to the end of the adjusting rod (5) and the anchor ring (9) at the bottom of the web of the curved bridge to provide sufficient supporting force or tension, effectively restrain the lateral displacement of the bridge, significantly enhance the anti-overturning force of the curved bridge, and under the action of the adjusting rod (5), together with the steel strand (1), optimize the force transmission in the beam of the curved bridge under the action of eccentric load or dynamic load.

[0017] The adjusting rod (5) is made of Q345 steel, and its diameter is consistent with that of the supporting rod (4). Anchor holes (12) are reserved at both ends, and the fixed pulley (2) and the supporting rod (4) are connected respectively. An anchor hole (12) is reserved near the supporting rod (4) of the adjusting rod (5), and the anchor rod (8) is connected here. The steel strand (1) is fixed at the hinge between the adjusting rod (5) and the anchor rod (8). According to the hinge position with the anchor rod (8) and the height of the limit block (7), when the adjusting rod (5) is subjected to the force from the steel strand (1) and the supporting rod (4) at both ends, it can rotate within 30° around the hinge with the anchor rod (8) as the center in the vertical plane, and play a lever role, thereby optimizing the force transmission between the supporting rod (4) and the steel strand (1) when the curved bridge is subjected to eccentric load or dynamic load, and effectively reducing the influence of the anti-overturning force on the lateral force of the bridge pier.

[0018] The steel sleeve (6) is fixed on the bridge pier and is made of Q235 steel with a thickness not less than 1 / 50 of the diameter of the bridge pier. It provides horizontal restraint for the bridge pier and disperses the external force transmitted to the bridge pier, thereby reducing the influence of the anti-overturning device on the lateral force of the bridge pier and ensuring the stability of the structure.

[0019] The anchor rod (8) is made of Q345 steel and welded to the steel sleeve (6). The width and inner distance of the anchor rod (8) are consistent with the diameter of the adjusting rod (5), and the thickness of the single-side anchor plate is not less than 1 / 5 of the inner distance. The anchor rod (8) is provided with an anchor hole (12) to hinge the adjusting rod (5) and transmit the force on the adjusting rod (5) to the steel sleeve (6) of the bridge pier.

[0020] The anchor ring (9) is made of Q345 steel and welded to the gasket (11) on the bottom surface of the bridge web. The width and inner distance of the anchor ring (9) are consistent with the diameter of the adjustment rod (5), and the thickness of the single-side anchor plate is not less than 1 / 5 of the inner distance. The anchor ring (9) is reserved with an anchor hole (12) to hinge the support rod (4) to ensure the transmission of force between the support rod (4) and the bridge.

[0021] The anchor block (10) is made of Q345 steel and is anchored at the bottom of the flange close to the bridge web. It adopts a right-angled triangular prism with good stability. The side length of the anchor block (10) is at least 3 times the diameter of the steel strand (1), and the thickness is at least greater than the diameter of the steel strand (1). The oblique side of the anchor block (10) anchors the steel strand (1) to ensure the transmission of force between the steel strand (1) and the bridge.

[0022] The gasket (11) is made of Q345 steel and is anchored on the bottom and side surfaces of the bottom of the bridge web. The side length of each side of the gasket (11) is at least twice the inner distance of the anchor ring (9), and the thickness of the gasket (11) is consistent with the thickness of the single-side anchor plate of the anchor ring (9). The gasket (11) is used to evenly disperse the force of the support rod (4) on the bridge web, while reducing the wear of the steel strand (1) itself and the bridge structure.

[0023] The anchor holes (12) are mainly arranged at the ends of the support rod (4), the adjustment rod (5), the anchor rod (8) and the anchor ring (9). The opening shape should be circular to reduce the stress concentration phenomenon at the connecting part of the rod. The opening diameter is 1 / 5 to 1 / 2 of the rod diameter, which is used to realize flexible connection between rigid bodies.

[0024] The bolt (13) is made of Q345 steel and has a hexagonal head (14). The length and diameter of the screw rod (15) are consistent with the anchor hole (12) and are used to fasten and connect the adjusting rod (5) and the anchor rod (8), the supporting rod (4) and the adjusting rod (5), the fixed pulley (2) and the adjusting rod (5), and the supporting rod (4) and the anchor ring (9).

[0025] The beneficial effects of the present invention compared with the prior art are: 1. The present invention has the advantages of simple and compact structure, convenient construction and low cost. It will not produce secondary structural damage during the construction process, will not affect the normal traffic under the bridge, and will not occupy the space under the bridge. It has high practicality and economy. 2. When a curved bridge is subjected to eccentric loads or dynamic loads, the interactively connected steel strands and support rods provide reinforcement together, optimize the internal force transmission path of the beam, and effectively restrain the lateral displacement of the bridge, significantly enhance the anti-overturning performance of the curved bridge, and prevent the risk of overturning of the curved bridge. 3. The application of steel strands combined with pulley blocks can, on the one hand, change the force direction of the steel strands, and on the other hand, optimize the force transmission, reduce the additional force generated by the tension of the steel strands on the lateral side of the bridge pier, and effectively improve the overall stress condition. 4. The adjusting rod acts as a lever, which can flexibly adjust the force transmission between the support rod and the steel strand when the curved bridge is subjected to eccentric load or dynamic load, and at the same time effectively reduce the influence of the anti-overturning force on the lateral force of the bridge pier, further enhancing the structural stability and safety of the curved bridge. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 A schematic structural diagram of a curved beam bridge anti-overturning device using a pulley block and an adjusting rod provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the coordination of the anti-overturning device of the curved beam bridge using a pulley block and an adjusting rod; Figure 3 for Figure 2 Schematic diagram of the coordination of the middle steel strand combined with pulley blocks, support rods and adjustment rods; Figure 4 for Figure 3 Schematic diagram of the structure of the fixed pulley and the movable pulley; Figure 5 for Figure 3 Schematic diagram of the structure of the middle support rod; Figure 6 for Figure 3 Schematic diagram of the structure of the middle adjustment rod; Figure 7 for Figure 3 Schematic diagram of the coordination between the steel sleeve, anchor rod and limit block; Figure 8 for Figure 3 Schematic diagram of the structure of the middle anchor ring; Fig. 9 for Figure 3 Schematic diagram of the structure of the middle anchor block; Fig.10 for Figure 3 Schematic diagram of the bolt structure. In the figure: 1-steel strand, 2-fixed pulley, 3-movable pulley, 4-support rod, 5-adjusting rod, 6-steel sleeve, 7-limiting block, 8-anchor rod, 9-anchor ring, 10-anchor block, 11-gasket, 12-anchor hole, 13-bolt, 14-hexagonal head, 15-screw. DETAILED DESCRIPTION The following is combined with Figure 1-9 The present invention is described in detail with reference to the accompanying drawings and embodiments to better understand the structural and functional characteristics of the present invention. The present invention can be better understood according to the following examples, but it should be pointed out that the examples are only examples for clearly explaining the present invention, rather than limiting the implementation methods of the present invention. Ordinary researchers in the field can still make other forms of beneficial changes based on the above description. It should be noted that in the description of the present invention, if the terms "center", "top", "bottom", "both sides", "vertical", "horizontal" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example 1 The present embodiment provides an anti-overturning device for a curved beam bridge using a pulley block and an adjusting rod, which mainly comprises: a steel strand (1), a fixed pulley (2), a movable pulley (3), a support rod (4), an adjusting rod (5), a steel sleeve (6), a limit block (7), an anchor rod (8), an anchor ring (9), an anchor block (10), a gasket (11), an anchor hole (12), a bolt (13), a hexagonal head (14) and a screw rod (15). The implementation steps are as follows: 1) For a curved bridge with a curvature radius of 350m, a single-column pier with a diameter of 1200mm is installed at the turning point. In order to enhance the anti-overturning ability of the curved bridge under eccentric loads or dynamic loads, an anti-overturning device is installed at the pier. The device is designed to optimize the transmission path of the internal force of the beam body and significantly improve the overall anti-overturning performance of the curved bridge. 2) Each set of anti-overturning devices is mainly composed of force transmission components (including steel strands, pulleys, support rods and adjustment rods) and other connecting parts. Four sets of anti-overturning devices are evenly arranged around the piers. The angle between each set of anti-overturning devices and the tangent of the curved bridge in the horizontal direction is 45°. The layout is scientific and reasonable, which is conducive to the effective transmission of force. 3) The steel strand adopts 7-wire type, with a diameter of 21.6mm and a cross-sectional area of ​​285mm 2 , tensile strength 1860MPa, maximum tension 530kN, maximum total elongation 3.5%. One end of the steel strand is connected to the hinge between the adjustment rod and the bridge pier, and the other end is connected to the anchor block at the bottom of the flange near the bridge web. During installation, the steel strand is pre-tensioned with a maximum tension of 10%, which can optimize the force transmission in the beam of the curved bridge under load. The steel strand is combined with the pulley block to reduce the influence of the steel strand on the lateral force of the bridge pier. At the same time, it cooperates with the support rod to improve the anti-overturning force of the curved bridge. 4) The fixed pulley and multiple movable pulleys form a pulley block, and cast steel with good hardness and wear resistance is selected to change the direction of the steel strand and reduce the influence of the tensioned steel strand on the lateral force of the bridge pier. The pulleys include two sizes (outer diameters of 400mm and 200mm respectively) to facilitate the smooth winding of the steel strand. The width and depth of the pulley groove are designed to be larger than the diameter of the steel strand to ensure the smooth running of the steel strand between the pulleys. In this embodiment, both are 50mm. 5) The support rod is made of Q345 steel with a diameter of 200mm. Anchor holes with a diameter of 50mm are reserved at both ends. The minimum distance between the anchor hole and the edge is 125mm. The anchor ring connected to the end of the adjusting rod and the bottom of the web of the curved bridge provides sufficient support or tension for the bridge, effectively restrains the lateral displacement of the bridge, significantly enhances the anti-overturning force of the curved bridge, and under the action of the adjusting rod, effectively optimizes the transmission of the internal force of the beam body when the curved bridge is subjected to eccentric loads or dynamic loads. 6) The adjusting rod is made of Q345 steel with a diameter of 200mm. Anchor holes with a diameter of 50mm are reserved at both ends. The minimum distance between the anchor hole and the edge is 125mm. They are connected to the redirecting fixed pulley and the support rod respectively. The steel strand is fixed at the hinge of the adjusting rod and the pier steel sleeve. The adjusting rod can rotate within 30° under the force of the supporting rod and the steel strand according to the hinge position with the pier steel sleeve and the height of the limit block. The adjusting rod optimizes the force transmission between the supporting rod and the steel strand when the curved bridge is subjected to eccentric load or dynamic load through the lever action, effectively reducing the influence of the anti-overturning lifting device on the lateral force of the pier. 7) The steel sleeve is fixed on the pier and is made of Q235 steel with a thickness of 50mm. It provides horizontal restraint for the pier and can also disperse the external force transmitted to the pier from the side, reduce the impact of the anti-overturning lifting device on the lateral force of the pier, and ensure the stability of the structure. 8) The anchor rod is welded on the steel sleeve and is made of Q345 steel. The width and inner distance of the anchor rod are both 200mm, and the thickness of the single-side anchor plate is 50mm. The anchor rod is reserved with an anchor hole with a diameter of 50mm, and the minimum distance between the anchor hole and the edge of the anchor rod is 125mm to hinge the adjustment rod and transmit the force on the adjustment rod to the steel sleeve of the pier. 9) The anchor ring is welded on the gasket on the bottom surface of the bridge web, using Q345 steel. The width and inner distance of the anchor ring are both 200mm, and the thickness of the single-side anchor plate is 50mm. The anchor ring reserves an anchor hole with a diameter of 50mm, and the minimum distance between the anchor hole and the edge of the anchor ring is 125mm to hinge the support rod to ensure the transmission of force between the support rod and the bridge. 10) The anchor block is anchored at the bottom of the flange close to the bridge web. It is made of Q345 steel and has a right-angled triangular prism structure with good stability. The right-angle side of the anchor block has a side length of 100 mm and a thickness of 30 mm. The oblique side of the anchor block anchors the steel strand to ensure the transmission of force between the steel strand and the bridge. 11) The gasket is anchored on the bottom and side of the bridge web. It is made of Q345 steel, with a side length of 600mm on each side and a thickness of 50mm. It is used to disperse the force of the support rod on the bridge web and reduce the wear of the steel strand itself and the bridge structure. 12) Anchor holes are set at the ends of the support rod, adjustment rod, anchor rod and anchor ring. The hole shape is circular and the hole diameter is 50mm, which is used to achieve flexible connection between rigid bodies. 13) The bolts are made of Q345 steel and have a hexagonal head. The length and diameter of the screw are consistent with the anchor hole. They are used to fasten the anchor rod and the adjusting rod, the adjusting rod and the support rod, the adjusting rod and the fixed pulley, and the support rod and the anchor ring. When a curved bridge is subjected to eccentric loading, the interactive connection of the above structures can optimize the transmission of internal forces in the beam, effectively constrain the lateral displacement of the bridge, and significantly enhance the anti-overturning force of the curved bridge. The above is a typical example of the present invention, but the implementation of the present invention is not limited to this.

Claims

1. A curved beam bridge anti-overturning device using a pulley block and an adjusting rod, mainly comprising: Steel strand, fixed pulley, movable pulley, support rod, adjusting rod, steel sleeve, limit block, anchor rod, anchor ring, anchor block, gasket, anchor hole, bolt, hexagon head and screw.

2. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: Multiple groups of steel strands and support rods are evenly arranged around the top of the pier, and the angle between each group of steel strands and support rods and the tangent of the curved bridge in the horizontal direction ranges from 30° to 60°. The steel strand can change its direction and adjust and optimize the force transmission path through the cooperation of the fixed pulley and the movable pulley, thus reducing the influence of the steel strand on the lateral force of the bridge pier. At the same time, the support rod provides sufficient support or tension for the curved beam bridge, effectively constrains the lateral displacement of the bridge, and significantly enhances the anti-overturning force of the curved beam bridge. The top ends of the steel strand and the support rod are respectively connected to the anchor block at the bottom of the flange and the anchor ring at the bottom of the web of the curved beam bridge. The other ends of the steel strand, the fixed pulley and the support rod are connected to the adjustment rod. The fixed pulley and the support rod are hinged at both ends of the adjustment rod, and the steel strand is fixed on the adjustment rod. The adjustment rod is hinged to the anchor rod of the steel sleeve of the bridge pier, which plays a lever role to realize the effective transmission and optimization of the force between the support rod and the steel strand. In addition, the steel strand and the support rod are provided with a limit block on the projection of the steel sleeve to limit the rotation angle of the adjustment rod. When the curved beam bridge is subjected to eccentric load or dynamic load, the interactive connection of the above structures can optimize the transmission of internal forces in the beam, effectively constrain the lateral displacement of the bridge, and significantly enhance the anti-overturning force of the curved beam bridge.

3. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: The diameter of the steel strand is at least 15mm, the tensile strength is at least 1200MPa, and the maximum tension is at least 400kN. The two ends of the steel strand are connected to the hinge between the adjusting rod and the bridge pier and the anchor block at the bottom of the flange near the bridge web. During installation, pre-tensioning of not less than 5% of the maximum tension can optimize the force transmission in the beam of the curved bridge under eccentric load or dynamic load, and provide appropriate tension when the curved bridge overturns, indirectly restrain the lateral displacement of the bridge, enhance the anti-overturning force of the curved bridge, and combine with fixed pulleys and movable pulleys to reduce the influence of the steel strand on the lateral force of the bridge pier. The fixed pulley and multiple movable pulleys form a pulley block, which is made of cast steel with good hardness and wear resistance. It includes two sizes of pulleys, and the diameter should be 10 to 20 times that of the steel strand to facilitate the winding of the steel strand. At the same time, the width and depth of the pulley groove must be greater than the diameter of the steel strand to ensure the smooth operation of the steel strand between the pulleys. It is used to change the direction of the steel strand and reduce the influence of the tensioned steel strand on the lateral force of the bridge pier.

4. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: The support rod is made of Q345 steel, and its diameter is usually not less than 1 / 20 of the bridge pier. Anchor holes are reserved at both ends and connected to the end of the adjusting rod and the anchor ring at the bottom of the web of the curved bridge to provide sufficient support or tension, effectively restrain the lateral displacement of the bridge, and significantly enhance the anti-overturning force of the curved bridge. Under the action of the adjusting rod, it works together with the steel strand to optimize the force transmission in the beam of the curved bridge under eccentric load or dynamic load.

5. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: The adjusting rod is made of Q345 steel, with the same diameter as the supporting rod. Anchor holes are reserved at both ends to connect the fixed pulley and the supporting rod respectively. An anchor hole is reserved near the supporting rod, where the anchor rod is connected. The steel strand is fixed at the hinge of the adjusting rod and the anchor rod. According to the hinge position with the anchor rod and the height of the limit block, when the adjusting rod is subjected to the force from the steel strand and the supporting rod at both ends, it can rotate no more than 30° around the hinge with the anchor rod as the center in the vertical plane, acting as a lever, thereby optimizing the force transmission between the supporting rod and the steel strand when the curved bridge is subjected to eccentric loads or dynamic loads, and effectively reducing the influence of the anti-overturning force on the lateral force of the bridge pier.

6. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: The steel sleeve is fixed on the pier and is made of Q235 steel with a thickness not less than 1 / 50 of the pier diameter. It provides horizontal restraint for the pier and disperses the external force transmitted to the pier, reducing the impact of the anti-overturning device on the lateral force of the pier and ensuring the stability of the structure. The anchor rod is made of Q345 steel and welded on the steel sleeve. The width and inner distance of the anchor rod are consistent with the diameter of the adjustment rod, and the thickness of the single-side anchor plate is not less than 1 / 5 of the inner distance. The anchor rod is equipped with an anchor hole to hinge the adjustment rod and transmit the force on the adjustment rod to the steel sleeve of the pier.

7. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: The anchor ring is made of Q345 steel and welded to the gasket on the bottom surface of the bridge web. The width and inner distance of the anchor ring are consistent with the diameter of the adjustment rod, and the thickness of the single-side anchor plate is not less than 1 / 5 of the inner distance. The anchor ring is reserved with anchor holes to hinge the support rod to ensure the transmission of force between the support rod and the bridge.

8. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: The anchor block is made of Q345 steel and anchored at the bottom of the flange close to the bridge web. It uses a right-angled triangular prism with good stability. The side length of the anchor block is at least 3 times the diameter of the steel strand, and the thickness is at least greater than the diameter of the steel strand. The hypotenuse of the anchor block anchors the steel strand to ensure the transmission of force between the steel strand and the bridge. The gasket is made of Q345 steel and is anchored on the bottom and side of the bridge web. The side length of each side of the gasket is at least twice the inner distance of the anchor ring, and the thickness of the gasket is consistent with the thickness of the single-side anchor of the anchor ring. The gasket is used to evenly disperse the force of the support rod on the bridge web, while reducing the wear of the steel strand itself and the bridge structure.

9. The anti-overturning device of a curved beam bridge using a pulley block and an adjusting rod according to claim 1, characterized in that: Anchor holes are mainly set at the ends of support rods, adjusting rods, anchor rods and anchor rings. The shape of the openings should be circular to reduce stress concentration at the connection points of the rods. The diameter of the openings is 1 / 5 to 1 / 2 of the diameter of the rods to achieve flexible connections between rigid bodies. The bolts are made of Q345 steel and have a hexagonal head. The length and diameter of the screw are consistent with the anchor hole. They are used to fasten the adjusting rod and anchor rod, the supporting rod and adjusting rod, the fixed pulley and adjusting rod, and the supporting rod and anchor ring.

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