Vibration double-reduction and limiting structure of pedestrian hanging beam under large-span bridge and assembly method

Abstract

The invention discloses a vibration double-reduction and limiting structure of a pedestrian hanging beam under a long-span bridge and an assembly method, the structure comprises a steel box beam, the bottom of the steel box beam is provided with a hanging beam, and the steel box beam is provided with a plurality of piers at intervals along the longitudinal bridge direction for supporting the steel box beam; a plurality of slings are arranged between the steel box girder and the two ends of the hanging beam in the transverse bridge direction at intervals in the longitudinal bridge direction, and a plurality of limiting assemblies are arranged between the hanging beam and the bridge piers. The steel box girder and the hanging beam are connected through the sling, and under the condition of small-amplitude vibration and displacement caused by vehicle passing, temperature change or other common factors, part of vibration energy is absorbed and dispersed through the elasticity and rigidity characteristics of the hanging rod, so that the amplitude of vibration is reduced, and the service life of the hanging rod is prolonged. Under the condition of large-amplitude vibration and displacement caused by strong wind, hurricanes and earthquakes, the relative displacement between the hanging beam and the pier is limited through the limiting assembly, excessive horizontal displacement is prevented, and therefore the stability of the hanging beam is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge structures, and more specifically, relates to a double vibration reduction and limiting structure and an assembly method for a pedestrian suspension beam under a large-span bridge. Background Art

[0002] In recent years, long-span bridges are developing in the direction of light weight, beautiful appearance and high durability. Among many bridge structures, the long-span hollow continuous steel box girder bridge with a suspension bridge has become one of the preferred bridge types for long-span bridges due to its excellent load-bearing performance. As an important force transmission component connecting the main beam of the steel box girder bridge and the suspension bridge, the hanger plays an important role in bearing external loads. Its safety, durability and applicability directly affect the service life of the entire bridge. Once the hanger is damaged, it needs to be maintained and replaced multiple times in time, otherwise it may cause serious traffic accidents and casualties, and have adverse effects on the economy and society.

[0003] At present, the hangers are generally made of steel strands or high-strength steel wire bundles, which are prone to rust when in direct contact with air and water; at the same time, the hangers have the characteristics of large slenderness ratio, which are prone to vibration and fatigue damage under wind load and seismic force. Under the dual effects of corrosion and fatigue, especially in coastal areas with severe environmental corrosion, high-intensity areas with frequent earthquakes, and mountainous areas with strong winds, the load-bearing capacity of the hangers is easy to degrade and eventually break.

[0004] In addition, under the influence of strong winds and earthquakes, swaying movements of varying amplitudes will occur between the main beam and the piers, which will inevitably cause violent collisions and frictions, seriously affecting the service life of the bridge. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a double vibration reduction and limiting structure and assembly method for a pedestrian suspension beam under a large-span bridge, in which a steel box beam and a suspension beam are connected by a sling, and the cross-sectional diameters of the two ends of the sling are different. The top end with a smaller diameter is connected to the steel box beam, and the bottom end with a larger diameter is connected to the suspension beam. In the case of small-amplitude vibration and displacement caused by vehicle passage, temperature changes or other common factors, the elasticity and stiffness characteristics of the suspender itself are used to absorb and disperse part of the vibration energy, thereby reducing the amplitude of the vibration, reducing the vibration response of the suspension beam, and improving the performance of the bridge and the safety and comfort of driving; by arranging a limiting component between the suspension beam and the pier, in the event of strong winds, hurricanes and earthquakes When large vibrations and displacements are caused, the relative displacement between the hanger beam and the pier is limited by the limit rod to prevent excessive horizontal displacement, thereby ensuring the stability of the hanger beam and enhancing the hanger beam's anti-overturning and anti-falling capabilities. The inner diameter of the upper connecting sleeve is slightly larger than the outer diameter of the limit rod, allowing the limit rod to produce local displacement to absorb huge energy impacts, avoid structural damage, and provide additional support for the hanger. To a certain extent, it can also reduce or avoid collisions and damage between the hanger beam and the pier. During assembly, it is only necessary to connect the lower connecting plate to the piers and other bridge components according to the position of the limit rod. The limit rod and the lower connecting tube no longer require additional installation steps, and the installation and replacement are simple, reducing the subsequent maintenance costs.

[0006] In order to achieve the above-mentioned object, according to one aspect of the present invention, a vibration reduction and limiting structure for a pedestrian suspension beam under a long-span bridge is provided, comprising a steel box beam, a suspension beam is provided at the bottom of the steel box beam, and a plurality of piers are provided at intervals along the longitudinal bridge direction of the steel box beam for supporting the steel box beam;

[0007] A plurality of suspension cables are arranged at intervals along the longitudinal direction of the steel box girder and the suspension beam between the transverse ends of the bridge, which can reduce the bridge vibration caused by live loads such as crowd loads and non-motor vehicles, wind force, earthquake force and other loads. A plurality of limit assemblies are arranged between the suspension beam and the pier, which can effectively reduce the relative movement between the suspension beam and the pier, reduce the collision and friction between the two, and effectively improve the anti-seismic and vibration safety of the bridge.

[0008] Furthermore, the sling includes a rope body, and short sheaths are provided on the outer sides of both ends of the rope body, U-shaped joints are provided at both ends of the rope body, a through hole is provided in the middle of the U-shaped joint perpendicular to the axial direction, and a pin is provided in the through hole.

[0009] Furthermore, the cable body is a carbon fiber rod with a truncated cone structure, and the two ends of the cable body are connected with different diameters, the end with a smaller diameter is connected to the steel box beam, and the other end with a larger diameter is connected to the suspension beam.

[0010] Furthermore, the upper anchoring assembly includes a stiffening partition fixedly installed on the top of the steel box girder bottom plate and an upper ear plate fixedly installed on the bottom of the steel box girder bottom plate, upper ear plate pads are provided on both sides of the upper ear plate, a first connecting through hole is provided in the middle of the upper ear plate, and a plurality of ear plate stiffening plates perpendicular to the upper ear plate are provided at the bottom of the steel box girder bottom plate, the ear plate stiffening plates are symmetrically distributed on both sides of the upper ear plate, and the side edges of the ear plate stiffening plates are fixedly connected to the upper ear plate.

[0011] Furthermore, the lower anchoring assembly includes a lower pad arranged on the top of the suspension beam top plate, a lower ear plate and an ear plate stiffening plate are fixedly installed on the top of the lower pad, the ear plate stiffening plate and the lower ear plate are perpendicular to each other, and the ear plate stiffening plates are supported on both sides of the lower ear plate, and the side surfaces thereof are fixedly connected to the lower ear plate, lower ear plate pads are provided on both sides of the top of the lower ear plate, and a second connecting through hole is provided on the top of the lower ear plate.

[0012] Furthermore, the lower anchor assembly also includes a plurality of grooved pads arranged between the top plate and the bottom plate of the suspension beam, and when the grooved pads are installed, the concave notches face outward, and rubber gaskets are arranged between the grooved pads and the top plate and the bottom plate of the suspension beam.

[0013] Furthermore, the limiting assembly includes a limiting rod, which is cylindrical. An upper connecting sleeve is provided at one end of the limiting rod. The inner diameter of the upper connecting sleeve is slightly larger than the outer diameter of the limiting rod. A first bolt hole is provided in the upper middle part of the upper connecting sleeve. An upper connecting plate is provided on the top of the upper connecting sleeve. A plurality of second bolt holes are provided around the upper connecting plate. The upper connecting plate is provided at the bottom of the suspension beam bottom plate and is fixedly connected to the suspension beam bottom plate by bolts.

[0014] Furthermore, a through hole is provided at the end of the limiting rod, the through hole is the same in position and size as the first bolt hole, and the limiting rod is fixedly connected to the upper connecting sleeve by bolts.

[0015] Furthermore, a lower connecting sleeve is fixedly installed on the other end of the limiting rod, a lower connecting plate is fixedly installed on the side of the lower connecting sleeve, a plurality of third bolt holes are arranged around the lower connecting plate, and the lower connecting plate is arranged on the side of the pier and fixedly connected to the side of the pier by bolts.

[0016] According to a second aspect of the present invention, there is provided a method for assembling a vibration dual reduction and limit structure of a pedestrian suspension beam under a long-span bridge, comprising the following steps:

[0017] S100: Prefabricate steel box beams, hanging beams, slings, upper anchoring assemblies, lower anchoring assemblies and limit assemblies in the workshop according to the design drawings and specification requirements, and then install the upper anchoring assemblies at the designated position of the steel box beams and the lower anchoring assemblies at the designated position of the hanging beams;

[0018] S200: transport the prefabricated steel box beams, hanging beams, slings and limiter components in the workshop to the construction site, construct the bridge piers according to the drawings, ensure that the size, position and quality of the bridge piers meet the design requirements, reserve bolt holes for connection with the limiter components during the construction of the bridge piers, ensure that the limiter components can be installed smoothly, and install the steel box beams on the top of the bridge piers;

[0019] S300: Use a crane or hoist to lift the prefabricated steel box girder in the workshop and accurately place it on the top of the bridge pier, fix the sling to the upper anchor assembly at the bottom of the steel box girder through a pin, use a crane to lift the sling to a predetermined position, and connect it to the other end of the sling through a pin;

[0020] S400: Insert one end of the limit rod into the upper connection sleeve, ensure that the through hole is aligned with the first bolt hole, use high-strength bolts to firmly connect the limit rod and the upper connection sleeve, and then fix the upper connection plate to the bottom of the suspension beam bottom plate by bolts, install the lower connection sleeve at the other end of the limit rod, and fix the lower connection plate on its side, and fix the lower connection plate to the side of the pier by bolts through the third bolt hole to ensure a firm and reliable connection;

[0021] S500: After assembly, conduct a comprehensive inspection of the entire structure to ensure that all components are installed in the correct position, connected firmly, and free of looseness, rust, etc.

[0022] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0023] 1. The present invention provides a double vibration reduction and limiting structure for a pedestrian suspension beam under a large-span bridge, in which a steel box beam and a suspension beam are connected by a suspension cable, and the cross-sectional diameters of the two ends of the suspension cable are different, the top end with a smaller diameter is connected to the steel box beam, and the bottom end with a larger diameter is connected to the suspension beam. In the case of small-amplitude vibration and displacement caused by vehicle passage, temperature changes or other common factors, part of the vibration energy is absorbed and dispersed through the elasticity and stiffness characteristics of the suspension rod itself, thereby reducing the amplitude of the vibration, reducing the vibration response of the suspension beam, and improving the performance of the bridge and the safety and comfort of driving.

[0024] 2. The present invention provides a double vibration reduction and limiting structure for a pedestrian suspension beam under a large-span bridge. By arranging a limiting component between the suspension beam and the pier, when there is a large vibration and displacement caused by strong winds, hurricanes and earthquakes, the relative displacement between the suspension beam and the pier is limited by the limiting rod to prevent excessive horizontal displacement, thereby ensuring the stability of the suspension beam and enhancing the anti-overturning and anti-falling capabilities of the suspension beam. The inner diameter of the upper connecting sleeve is slightly larger than the outer diameter of the limiting rod, allowing the limiting rod to produce local displacement to absorb huge energy impacts, avoid structural damage, and provide additional support for the suspension rod. To a certain extent, it can also reduce or avoid collisions and damage between the suspension beam and the pier. During assembly, it is only necessary to connect the lower connecting plate to bridge components such as the pier according to the position of the limiting rod. The limiting rod and the lower connecting tube no longer require additional installation steps, and the installation and replacement are simple, reducing the subsequent maintenance costs.

[0025] 3. The present invention provides a double vibration reduction and limiting structure for a pedestrian suspension beam under a large-span bridge. By introducing carbon fiber materials into the bridge's anti-seismic vibration, carbon fiber rods are used instead of bridge hangers. The carbon fiber material has the advantages of high tensile strength, low density, corrosion resistance, fatigue resistance, good durability, and good electromagnetic insulation. It can reduce the vibration of the bridge caused by live loads, wind force, earthquake force and other loads, can better adapt to the harsh service environment of the bridge, has a long service life, low replacement and maintenance costs, and good life cycle benefits. At the same time, the carbon fiber rods are used to connect the suspension beam and the pier, which can effectively reduce the relative movement between the suspension beam and the pier, reduce the collision and friction between the two, improve the anti-seismic vibration safety of the bridge, and provide an important reference for the anti-seismic vibration design of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional layout diagram of a double vibration reduction and position limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0027] Figure 2 This is a vertical layout diagram of a vibration double reduction and limit structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0028] Figure 3 This is a layout diagram of the limiting components of a double vibration reduction and limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0029] Figure 4 This is a cable structure diagram of a double vibration reduction and position limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0030] Figure 5 It is a cross-sectional view of a suspension cable of a double vibration reduction and position limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0031] Figure 6It is a front view of an upper anchoring assembly of a double vibration reduction and limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0032] Figure 7 It is a side view of the upper anchorage group of a double vibration reduction and limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0033] Figure 8 It is a top view of an upper anchorage group of a double vibration reduction and limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0034] Fig. 9 It is a front view of a lower anchoring assembly of a double vibration reduction and limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0035] Fig.10 It is a side view of the lower anchorage group of a double vibration reduction and limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0036] Fig.11 It is a top view of the lower anchorage group of a double vibration reduction and limiting structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0037] Fig.12 This is a schematic diagram of the connection between a limit assembly and a suspension beam of a double vibration reduction and limit structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0038] Fig.13 This is a schematic diagram of the connection between the limiting components and the bridge piers of the double vibration reduction and limiting structure of the pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0039] Fig.14 This is a structural diagram of a limit rod of a vibration double reduction and limit structure of a pedestrian suspension beam under a long-span bridge according to an embodiment of the present invention;

[0040] Fig.15 The present invention is a flowchart of an assembly method of a double vibration reduction and limiting structure of a pedestrian suspension beam under a large-span bridge according to an embodiment of the present invention.

[0041] In all the drawings, the same figure marks represent the same technical features, specifically: 1-steel box girder, 2-suspension beam, 3-pier, 4-suspension cable, 41-cable body, 42-short sleeve, 43-U-shaped joint, 44-pin shaft, 5-upper anchor assembly, 51-stiffening partition, 52-upper ear plate, 53-ear plate stiffening plate, 54-upper ear plate pad, 55-first connecting through hole, 6-lower anchor assembly, 61-lower ear plate, 62-ear plate stiffening plate, 63-lower ear plate pad, 64-lower pad, 65-second connecting through hole, 66-rubber gasket, 67-groove pad, 7-limiting assembly, 71-limiting rod, 72-upper connecting plate, 73-upper connecting sleeve, 74-first bolt hole, 75-second bolt hole, 76-lower connecting plate, 77-lower connecting sleeve, 78-third bolt hole. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0046] Example 1

[0047] like Figure 1-3 As shown, an embodiment of the present invention provides a double vibration reduction and limiting structure for a pedestrian suspension beam under a large-span bridge, comprising a steel box beam 1, a suspension beam 2 is provided at the bottom of the steel box beam 1 for driving non-motor vehicles and pedestrians, a plurality of piers 3 are provided at intervals along the longitudinal direction of the steel box beam 1 for supporting the steel box beam 1, a plurality of suspension cables 4 are provided at intervals along the longitudinal direction between the two ends of the steel box beam 1 and the suspension beam 2 in the transverse direction, a plurality of limiting assemblies 7 are provided between the suspension beam 2 and the pier 3; the setting of the suspension beam 2 provides an independent passage space for non-motor vehicles and pedestrians, avoids mixing with motor vehicles, and improves the passage efficiency and safety of non-motor vehicles; the limiting assembly 7 connects the suspension beam 2 with the pier 3, which can effectively reduce the relative movement between the suspension beam 2 and the pier 3, reduce the collision and friction between the two, and effectively improve the anti-seismic safety of the bridge. The suspension cable 4 is arranged between the steel box girder 1 and the suspension beam 2; the earthquake force is transmitted to the steel box girder 1 through the bridge pier 3, and then transmitted to the suspension beam 2 through the suspension cable 4. Since the size and mass of the steel box girder 1 are usually large, the inertia force generated by it under the action of an earthquake is also relatively large. The earthquake force acting on the steel box girder is much greater than the earthquake force borne by the suspension beam 2. The suspension cable 4 has great rigidity and strong bearing capacity, and can withstand the bending moment generated by the top earthquake force, wind force and other horizontal forces, so that the suspension cable 4 has high stability under strong earthquakes and is not easy to break. At the same time, during the normal use of the bridge, vehicles pass, temperature When the degree change or other common factors cause small vibrations and displacements of the hanger beam, if these vibrations and displacements are not effectively controlled, they may have an adverse effect on the durability of the bridge structure and the driving comfort. The elasticity and stiffness characteristics of the hanger itself can absorb and disperse part of the vibration energy, thereby reducing the amplitude of the vibration and reducing the vibration response of the hanger beam, thereby improving the performance of the bridge and the safety and comfort of driving, helping to extend the service life of the bridge and reduce structural fatigue damage caused by vibration. At the same time, it also provides a smoother driving environment for vehicles.

[0048] like Figure 4-5As shown, the sling 4 includes a cable body 41, which is a carbon fiber rod with a truncated cone structure, and the two ends of the cable body 41 are different, the end with a smaller diameter is connected to the steel box girder 1, and the end with a larger diameter is connected to the suspension beam 2; the sling 4 uses a carbon fiber rod with a truncated cone structure as the cable body 41, which improves the load-bearing capacity and stiffness of the sling. Especially in extreme environments such as earthquakes, the cable 4 can effectively transmit and disperse the seismic force. During the transmission process from the steel box girder 1 to the suspension beam 2, the special shape design of the cable 4 makes the seismic force borne by the suspension beam 2 relatively small, thereby protecting the integrity of the main structure of the bridge and enhancing the overall stability of the bridge. The design of different diameters at both ends of the cable 4 makes the end with a smaller diameter connected to the steel box girder 1 and the end with a larger diameter connected to the suspension beam 2, which optimizes the force transmission path in the cable, so that the cable 4 can better resist bending moment when subjected to horizontal forces such as earthquake force and wind force, and reduce the risk of fracture caused by stress concentration. The cross-sectional diameter of the cable body 41 end where the cable 4 is connected to the suspension beam 2 is larger, which greatly enhances the stability of the cable 4 when subjected to top seismic force. Due to the larger diameter, the stiffness of this area is higher and can withstand greater bending moments, making it less likely to break under strong earthquakes, ensuring the safe operation of the bridge under extreme conditions. Carbon fiber materials are widely used in structures such as bridges due to their light weight, high strength, and corrosion resistance. The sling 4 uses carbon fiber rods as the cable body 41, which not only reduces the dead weight of the sling, but also improves the utilization efficiency of the material, making the entire bridge structure lighter and more efficient, with high bending stiffness, and can reduce bridge vibrations caused by live loads such as crowd loads and non-motor vehicles, wind force, and earthquake force. By optimizing the design of the sling 4, its ability to resist various external forces is improved, thereby extending the service life of the sling, which not only reduces the frequency and cost of bridge maintenance, but also improves the long-term operating benefits of the bridge.

[0049] Furthermore, U-shaped joints 43 are provided at both ends of the cable body 41, and a through hole is provided in the middle of the U-shaped joint 43 perpendicular to the axial direction for connecting with the steel box girder 1 and the suspension beam 2. Short sheaths 42 are provided on the outer sides of both ends of the cable body 41 to prevent the ends of the cable body 41 from directly contacting external hard objects, avoiding wear and scratches, reducing the contact of the cable body 41 with humid air, corrosive substances, etc., and delaying the corrosion process.

[0050] like Figure 6-8As shown, the upper anchor assembly 5 includes a stiffening partition 51 fixedly installed on the top of the bottom plate of the steel box girder 1 and an upper ear plate 52 fixedly installed on the bottom of the bottom plate of the steel box girder 1. Upper ear plate pads 54 are provided on both sides of the upper ear plate 52. A first connecting through hole 55 is provided in the middle of the upper ear plate 52. Through this through hole, the sling 4 can be firmly fixed to the steel box girder 1, ensuring the effective transmission of force and facilitating installation and maintenance. A plurality of ear plate stiffening plates 53 perpendicular to the upper ear plate 52 are provided at the bottom of the bottom plate of the steel box girder 1. The ear plate stiffening plates 53 are symmetrically distributed on both sides of the upper ear plate 52, and the sides of the ear plate stiffening plates 53 are fixedly connected to the upper ear plate 52; the stiffening partition 51 and the ear plate stiffening plates 53 can be In order to improve the overall stiffness of the upper anchor assembly 5 and ensure its local stability, and at the same time make the upper anchor assembly 5 and the sling 4 evenly stressed, prevent them from buckling, and improve the stability of the equivalent hanger, the ear plate stiffening plates 53 are symmetrically distributed on both sides of the upper ear plate 52 and fixedly connected to the upper ear plate 52, which helps to evenly disperse the load transmitted by the sling 4 to the bottom plate area of ​​the steel box girder 1, avoiding the occurrence of stress concentration, thereby extending the service life of the structure, and the upper ear plate pads 54 are arranged on both sides of the upper ear plate 52, which can increase the bearing area of ​​the contact between the sling 4 and the upper ear plate 52, disperse the contact pressure, and at the same time reduce the relative movement and friction between the upper ear plate 52 and the sling 4, thereby increasing the service life of the sling 4.

[0051] like Figure 9-11 As shown, the lower anchor assembly 6 includes a lower pad 64 arranged on the top of the top plate of the suspension beam 2, and a lower ear plate 61 and an ear plate stiffening plate 62 are fixedly installed on the top of the lower pad 64, the ear plate stiffening plate 62 is perpendicular to the lower ear plate 61, and the ear plate stiffening plate 62 is symmetrically arranged on both sides of the lower ear plate 61, and its side surfaces are fixedly connected to the lower ear plate 61, lower ear plate pads 63 are arranged on both sides of the top of the lower ear plate 61, and a second connecting through hole 65 is arranged on the top of the lower ear plate 61, the lower ear plate 61 and the ear plate stiffening plate 62 are perpendicular to each other and fixedly connected, which enhances the bending resistance and overall rigidity of the connection point and ensures that the sling 4 and the suspension beam 2 can be firmly connected, the lower pad 64 provides a stable installation platform for the lower ear plate, increases the contact area, and reduces stress concentration, and the ear plate stiffening plates 62 are symmetrically arranged on both sides of the lower ear plate 61, such an arrangement can effectively disperse the stress transmitted from the sling, and avoid material fatigue or fracture caused by excessive local stress.

[0052] Furthermore, the lower anchor assembly 6 also includes a plurality of grooved pads 67 arranged between the top plate and the bottom plate of the suspension beam 2, and when the grooved pads 67 are installed, the concave grooves face outward, and rubber gaskets 66 are arranged between the grooved pads 67 and the top plate and the bottom plate of the suspension beam 2. The rubber gaskets 66 and the grooved pads 67 can absorb and mitigate the impact force of the live load on the suspension beam 2 to a certain extent, reduce the vibration of the bridge, and ensure the stability and safety of the suspension beam 2.

[0053] Furthermore, the sling 4 passes through the through hole of the U-shaped joint 43 and the first connecting through hole 55 on the upper ear plate 52 in sequence through the pin shaft 44, so as to fix the sling 4 to the steel box girder 1. The sling 4 passes through the through hole of the U-shaped joint 43 and the second connecting through hole 65 on the lower ear plate 61 in sequence through the pin shaft 44, so as to fix the sling 4 to the suspension beam 2.

[0054] like Figure 12-14 As shown, a plurality of limit assemblies 7 are provided between the suspension beam 2 and the pier 3, and the limit assemblies 7 include a limit rod 71, which is cylindrical, and an upper connecting sleeve 73 is provided at one end of the limit rod 71, and the inner diameter of the upper connecting sleeve 73 is slightly larger than the outer diameter of the limit rod 71, and a first bolt hole 74 is provided in the upper middle part of the upper connecting sleeve 73, and an upper connecting plate 72 is provided on the top of the upper connecting sleeve 73, and a plurality of second bolt holes 75 are provided around the upper connecting plate 72, and the upper connecting plate 72 is provided at the bottom of the bottom plate of the suspension beam 2, and is fixedly connected to the bottom plate of the suspension beam 2 by bolts; in the case of large-scale vibration and displacement caused by strong winds, hurricanes and earthquakes, the relative displacement between the suspension beam 2 and the pier 3 is limited by the limit assembly 7 to prevent excessive water from occurring. The upper connecting sleeve 73 has an inner diameter slightly larger than the outer diameter of the limiting rod 71, allowing the limiting rod 71 to produce local displacement to absorb huge energy impacts and avoid structural damage. It also provides additional support for the limiting rod 71, and can also reduce or avoid collisions and damage between the beam 2 and the pier 3 to a certain extent. During assembly, it is only necessary to connect the lower connecting plate to bridge components such as piers according to the position of the limiting rod. The limiting rod and the lower connecting tube no longer require additional installation steps, and are simple to install and replace, reducing the subsequent maintenance costs. Through the arrangement of multiple limiting components 7, multi-point constraints on the beam 2 are formed, enhancing the beam 2's ability to resist overturning and prevent falling beams. When subjected to lateral force, the limit assembly 7 can provide sufficient resistance to keep the suspension beam 2 in a stable posture, reduce the risk of overturning and falling of the suspension beam 2, and ensure the safe operation of the bridge. The first bolt hole 74 in the upper connection sleeve 73 and the second bolt holes 75 around the upper connection plate 72 allow the limit assembly 7 to be firmly fixed to the bottom plate of the suspension beam 2 through high-strength bolts. This connection method not only improves the reliability of the connection, but also facilitates disassembly and maintenance. The inner diameter of the upper connection sleeve 73 is slightly larger than the outer diameter of the limit rod 71, allowing the limit rod 71 to generate local displacement inside the upper connection sleeve 73 to meet the shrinkage deformation of the suspension beam 2 caused by temperature, as well as small vibration deformation.

[0055] Furthermore, the limit rod 71 is made of carbon fiber rods. The carbon fiber material has the advantages of high tensile strength, low density, corrosion resistance, fatigue resistance, good durability, and good electromagnetic insulation. It can reduce the vibration of the bridge caused by live loads, wind force, earthquake force and other loads, and can better adapt to the harsh service environment of the bridge. It has a long service life, low replacement and maintenance costs, and good life cycle benefits. At the same time, using carbon fiber rods to connect the suspension bridge and the piers can effectively reduce the relative movement between the suspension bridge and the piers, reduce the collision and friction between the two, and improve the seismic and vibration safety of the bridge.

[0056] Furthermore, the limiting rod 71 is provided with a through hole at a distance from the end, and the through hole is the same in position and size as the first bolt hole 74. The limiting rod 71 is connected to the upper connecting sleeve 73 by bolts. The bolt connection can withstand large tensile and shear forces, and is simple to install and replace, which enables rapid assembly and replacement of the limiting rod, and effectively avoids relative sliding or separation between the limiting rod 71 and the upper connecting sleeve 73 during the force-bearing process, thereby ensuring the stability and reliability of the limiting assembly 7 during long-term use, and providing a stronger guarantee for the stable limiting of the suspension beam 2.

[0057] Furthermore, a lower connecting sleeve 77 is fixedly installed on the other end of the limiting rod 71, and the diameter of the lower connecting sleeve 77 should be equal to or slightly larger than the diameter of the limiting rod. A lower connecting plate 76 is fixedly installed on the side of the lower connecting sleeve 77, and a plurality of third bolt holes 78 are arranged around the lower connecting plate 76. The lower connecting plate 76 is arranged on the side of the pier 3 and is fixedly connected to the side of the pier 3 by bolts.

[0058] When subjected to external force, the limit rod 71 can effectively transfer the force to the pier 3, and the pier 3 can also provide stable support for the limit rod 71, thereby enhancing the bearing capacity and anti-deformation ability of the entire limit assembly 7, and further ensuring the stability of the limiting relationship between the suspension beam 2 and the pier 3; through the bolt connection at both ends of the limit rod 71, a more stable overall structure is formed between the suspension beam 2, the limit assembly 7 and the pier 3. When subjected to complex external forces such as horizontal force, vertical force, earthquake force, wind load, etc., the various components can restrain each other and work together to resist external forces, thereby reducing the deformation and vibration of the structure, enhancing the anti-overturning ability and anti-falling ability of the suspension beam 2, improving the overall stability of the bridge, reducing the risk of chain reactions caused by local structural failure, and ensuring the safe operation of the bridge. The inner diameter of the upper connecting sleeve 73 is slightly larger than the outer diameter of the limit rod 71, allowing the limit rod 71 to produce local displacement inside the upper connecting sleeve 73 to meet the shrinkage deformation of the suspension beam 2 caused by temperature, as well as small vibration deformation. During routine maintenance, the staff can conveniently check the connection parts of the limit assembly 7 to see if the bolts are loose or corroded, and tighten or replace them in time. When it is necessary to replace the limit rod 71 and other parts, just loosen the corresponding bolts to easily remove the parts for repair or replacement, without large-scale dismantling or destruction of other structural parts, making maintenance work simpler and more efficient.

[0059] Furthermore, the limit assembly 7 can flexibly adjust parameters such as the length, diameter, and specifications and quantity of the limit rod 71 as well as the specifications and quantity of bolts according to different bridge structural forms, spans, load conditions, and working conditions such as earthquakes and wind loads, so as to meet the limit requirements under various complex working conditions.

[0060] Example 2

[0061] Combination Figure 1-4 ,like Fig.15 As shown, the present invention provides an assembly method of a vibration double reduction and limit structure of a pedestrian suspension beam under a large-span bridge, comprising the following steps:

[0062] S100: Prefabricate the steel box girder 1, the hanging beam 2, the sling 4, the upper anchor assembly 5, the lower anchor assembly 6 and the limit assembly 7 in the workshop according to the design drawings and specification requirements, and then install the upper anchor assembly 5 at the specified position of the steel box girder 1, and install the lower anchor assembly 6 at the specified position of the hanging beam 2;

[0063] S200: transport the prefabricated steel box girder 1, suspension beam 2, suspension cable 4 and limit assembly 7 in the workshop to the construction site, construct the bridge pier 3 according to the drawings, ensure that the size, position and quality of the bridge pier 3 meet the design requirements, reserve bolt holes for connection with the limit assembly 7 during the construction of the bridge pier 3, ensure that the limit assembly 7 can be installed smoothly, and install the steel box girder 1 on the top of the bridge pier 3;

[0064] S300: Use a crane or a hoist to lift the prefabricated steel box girder 1 in the workshop and accurately place it on the top of the bridge pier, fix the sling 4 to the upper anchor assembly 5 at the bottom of the steel box girder 1 through the pin 44, use a crane to lift the hanging beam 2 to a predetermined position, and connect it to the other end of the sling 4 through the pin 44;

[0065] S400: insert one end of the limit rod 71 into the upper connecting sleeve 73, ensure that the through hole is aligned with the first bolt hole 74, use high-strength bolts to firmly connect the limit rod 71 and the upper connecting sleeve 73, and then fix the upper connecting plate 72 to the bottom of the bottom plate of the suspension beam 2 by bolts, install the lower connecting sleeve 77 at the other end of the limit rod 71, and fix the lower connecting plate 76 on the side thereof, and fix the lower connecting plate 76 to the side of the pier 3 by bolts passing through the third bolt hole 78, to ensure that the connection is firm and reliable;

[0066] S500: After assembly, conduct a comprehensive inspection of the entire structure to ensure that all components are installed in the correct position, connected firmly, and free of looseness, rust, etc.

[0067] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double vibration reduction and limiting structure for pedestrian suspension beams under long-span bridges, characterized in that: It comprises a steel box girder (1), a hanging beam (2) is provided at the bottom of the steel box girder (1), and a plurality of bridge piers (3) are provided at intervals along the longitudinal bridge direction of the steel box girder (1) for supporting the steel box girder (1); A plurality of suspension cables (4) are arranged at intervals along the longitudinal direction of the bridge between the two ends of the steel box girder (1) and the suspension beam (2) in the transverse direction of the bridge, which can reduce bridge vibration caused by live loads such as crowd loads and non-motor vehicles, wind force, earthquake force and the like. A plurality of limiter assemblies (7) are arranged between the suspension beam (2) and the bridge pier (3), which can effectively reduce the relative movement between the suspension beam (2) and the bridge pier (3), reduce the collision and friction between the two, and effectively improve the anti-seismic safety of the bridge.

2. The double vibration reduction and position limiting structure for pedestrian suspension beams under long-span bridges according to claim 1 is characterized in that: The sling (4) comprises a rope body (41), and short sheaths (42) are provided on the outer sides of both ends of the rope body (41), and U-shaped joints (43) are provided at both ends of the rope body (41), and a through hole is provided in the middle of the U-shaped joint (43) perpendicular to the axial direction, and a pin shaft (44) is provided in the through hole.

3. The vibration reduction and limiting structure for pedestrian suspension beams under long-span bridges according to claim 2 is characterized in that: The cable body (41) is a carbon fiber rod with a truncated cone structure, and the two ends of the cable body (41) are different in diameter, the end with a smaller diameter is connected to the steel box beam (1), and the other end with a larger diameter is connected to the suspension beam (2).

4. The double vibration reduction and position limiting structure for pedestrian suspension beams under long-span bridges according to claim 1 is characterized in that: The upper anchoring assembly (5) comprises a stiffening partition (51) fixedly mounted on the top of the bottom plate of the steel box girder (1) and an upper ear plate (52) fixedly mounted on the bottom of the bottom plate of the steel box girder (1), upper ear plate pads (54) are provided on both sides of the upper ear plate (52), a first connecting through hole (55) is provided in the middle of the upper ear plate (52), and a plurality of ear plate stiffening plates (53) perpendicular to the upper ear plate (52) are provided at the bottom of the bottom plate of the steel box girder (1), the ear plate stiffening plates (53) are symmetrically distributed on both sides of the upper ear plate (52), and the sides of the ear plate stiffening plates (53) are fixedly connected to the upper ear plate (52).

5. A vibration reduction and limiting structure for pedestrian suspension beams under long-span bridges according to any one of claims 1 to 4, characterized in that: The lower anchoring assembly (6) comprises a lower pad (64) arranged on the top of the top plate of the suspension beam (2); a lower ear plate (61) and an ear plate stiffening plate (62) are fixedly installed on the top of the lower pad (64); the ear plate stiffening plate (62) and the lower ear plate (61) are perpendicular to each other, and the ear plate stiffening plate (62) is supported on both sides of the lower ear plate (61), and its side surface is fixedly connected to the lower ear plate (61); lower ear plate pads (63) are provided on both sides of the top of the lower ear plate (61); and a second connecting through hole (65) is provided on the top of the lower ear plate (61).

6. The vibration reduction and limiting structure for pedestrian suspension beams under long-span bridges according to claim 5 is characterized in that: The lower anchor assembly (6) further comprises a plurality of grooved pads (67) arranged between the top plate and the bottom plate of the suspension beam (2), and when the grooved pads (67) are installed, the concave grooves face outwards, and rubber gaskets (66) are arranged between the grooved pads (67) and the top plate and the bottom plate of the suspension beam (2).

7. A vibration reduction and limiting structure for pedestrian suspension beams under long-span bridges according to any one of claims 1 to 4, characterized in that: The limiting assembly (7) comprises a limiting rod (71), which is cylindrical. An upper connecting sleeve (73) is provided at one end of the limiting rod (71). The inner diameter of the upper connecting sleeve 73 is slightly larger than the outer diameter of the limiting rod 71. A first bolt hole (74) is provided at the upper middle portion of the upper connecting sleeve (73). An upper connecting plate (72) is provided at the top of the upper connecting sleeve (73). A plurality of second bolt holes (75) are provided around the upper connecting plate (72). The upper connecting plate (72) is provided at the bottom of the bottom plate of the suspension beam (2) and is fixedly connected to the bottom plate of the suspension beam (2) by bolts.

8. The vibration dual reduction and position limiting structure for pedestrian suspension beams under long-span bridges according to claim 7, characterized in that: A through hole is provided at one end of the limiting rod (71) at a distance from the end portion, the through hole having the same position and size as the first bolt hole (74), and the limiting rod (71) is fixedly connected to the upper connecting sleeve (73) by means of bolts.

9. The double vibration reduction and position limiting structure for pedestrian suspension beams under long-span bridges according to claim 8, characterized in that: A lower connecting sleeve (77) is fixedly mounted on the other end of the limiting rod (71), a lower connecting plate (76) is fixedly mounted on the side of the lower connecting sleeve (77), a plurality of third bolt holes (78) are arranged around the lower connecting plate (76), and the lower connecting plate (76) is arranged on the side of the pier (3) and fixedly connected to the side of the pier (3) by bolts.

10. An assembly method of a vibration reduction and limiting structure for a pedestrian suspension beam under a long-span bridge as claimed in any one of claims 1 to 9, characterized in that: The steps include: S100: Prefabricate the steel box girder (1), the hanging beam (2), the sling (4), the upper anchor assembly (5), the lower anchor assembly (6) and the limit assembly (7) in the workshop according to the design drawings and specification requirements, and then install the upper anchor assembly (5) at the designated position of the steel box girder (1), and install the lower anchor assembly (6) at the designated position of the hanging beam (2); S200: transport the prefabricated steel box girder (1), suspension beam (2), suspension cable (4) and limit assembly (7) in the workshop to the construction site, construct the bridge pier (3) according to the drawings, ensure that the size, position and quality of the bridge pier (3) meet the design requirements, reserve bolt holes for connecting with the limit assembly (7) during the construction of the bridge pier (3), ensure that the limit assembly (7) can be installed smoothly, and install the steel box girder (1) on the top of the bridge pier (3); S300: Use a crane or a hoist to lift the prefabricated steel box girder (1) in the workshop and accurately place it on the top of the bridge pier, fix the sling (4) to the upper anchor assembly (5) at the bottom of the steel box girder (1) through the pin shaft (44), use the crane to lift the sling beam (2) to a predetermined position, and connect it to the other end of the sling (4) through the pin shaft (44); S400: insert one end of the limit rod (71) into the upper connecting sleeve (73), ensure that the through hole is aligned with the first bolt hole (74), use high-strength bolts to firmly connect the limit rod (71) and the upper connecting sleeve (73), and then fix the upper connecting plate (72) to the bottom of the bottom plate of the suspension beam (2) by bolts, install the lower connecting sleeve (77) at the other end of the limit rod (71), and fix the lower connecting plate (76) on the side thereof, and fix the lower connecting plate (76) to the side of the pier (3) by bolts passing through the third bolt hole (78), ensuring that the connection is firm and reliable; S500: After assembly, conduct a comprehensive inspection of the entire structure to ensure that all components are installed in the correct position, connected firmly, and free of looseness, rust, etc.

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