High-iron bridge damping device capable of actively carrying out replacement repair after damage

Abstract

The application discloses a high-speed railway bridge damping device capable of actively carrying out replacement repair after damage, which comprises a damping and isolation support arranged on the top of a prefabricated pier column, damping units symmetrically arranged on the two sides of the damping and isolation support, and a unit body of each damping unit connected and fixed with a beam body and the prefabricated pier column through pre-embedded components. The unit body comprises an initial energy dissipation component and a standby energy dissipation component arranged in parallel with the initial energy dissipation component. When the initial energy dissipation component is sheared and damaged, the standby energy dissipation component can automatically change the position to replace the support and energy dissipation effect of the initial energy dissipation component, carry out self-repair of the damping unit, protect the support from being damaged by the earthquake effect, and thus the beam damage is avoided.

Description

A vibration damping device for high-speed railway bridges that can actively replace and repair itself after damage. Technical Field

[0001] This invention belongs to the field of vibration reduction for high-speed railway bridges, specifically a vibration reduction device for high-speed railway bridges that can actively replace and repair itself after damage. Background Technology

[0002] Because high-speed railways often traverse long distances, and the geological and hydrological conditions vary greatly across different regions, their construction is significantly impacted. Furthermore, the high speeds of high-speed railways necessitate a high level of ride smoothness and comfort. Therefore, bridges are frequently constructed during the high-speed railway project to mitigate the effects of complex terrain. Bridges play a crucial role in the entire high-speed railway system, and it is essential to prevent them from suffering significant damage during earthquakes.

[0003] Currently, seismic isolation and damping devices are commonly used to achieve seismic resistance in bridges. These devices include seismic isolation bearings and dampers. Common seismic isolation bearings include lead-core rubber bearings, high-damping rubber bearings, and friction pendulum bearings. Commonly used dampers include steel dampers and fluid viscous dampers.

[0004] The working principle of seismic isolation and damping technology mainly involves the following two aspects:

[0005] On the one hand, the supports are connected to the superstructure (main beams, etc.) and the cap beam piers at both ends to form a series structure. The seismic isolation device itself has relatively low stiffness (post-buckling stiffness). The overall stiffness after series connection is close to a small value, thus making the series structure system more flexible, avoiding the high-frequency region of seismic energy, and reducing the seismic response of the structure.

[0006] On the other hand, seismic isolation devices dissipate seismic input energy through plastic damping or viscous damping.

[0007] However, most of the above systems have the following drawbacks:

[0008] 1. When the damper fails, it can no longer provide support and protection for the bridge structure;

[0009] 2. Energy-consuming equipment cannot self-repair under earthquake conditions and must be replaced;

[0010] Therefore, even if some high-speed railway bridges are equipped with seismic isolation devices, the bridge may still experience support failure or beam collapse if these devices are damaged. Summary of the Invention

[0011] The purpose of this invention is to provide a seismic isolation device for high-speed railway bridges that can self-repair in the event of earthquake damage, so as to avoid damage to the seismic isolation bearings and / or beam collapse.

[0012] The vibration damping device for high-speed railway bridges provided by this invention, capable of proactive replacement and repair after damage, adopts the following technical solution: It includes a seismic isolation bearing installed on the top of a precast pier, and vibration damping units symmetrically arranged on both sides of the bearing. The main body of each vibration damping unit is connected and fixed to the beam and the precast pier via embedded components. Each unit includes an initial energy-dissipating component and a spare energy-dissipating component arranged parallel to it. When the initial energy-dissipating component is sheared and damaged, the spare energy-dissipating component automatically changes position to replace the supporting and energy-dissipating function of the initial component, thus achieving self-repair of the vibration damping unit.

[0013] When the above technical solution is implemented, the main body of the unit also includes an I-shaped plate structure, and the initial energy dissipation component is connected between the center planes of the upper and lower wing plates along the length direction. The initial energy dissipation component is a rectangular steel plate.

[0014] When the above technical solution is implemented, there are two sets of backup energy-consuming components, which are symmetrically arranged on both sides of the initial energy-consuming component.

[0015] When the above technical solution is implemented, the upper mounting platform of the spare energy-consuming component is symmetrically fixed at both ends of the bottom surface of the upper wing plate along the length direction. The bottom outer side of the upper mounting platform is provided with a downwardly inclined upper sliding groove, and the cross-sectional shape of the upper sliding groove is T-shaped.

[0016] When the above technical solution is implemented, the lower mounting platforms of the spare energy-consuming components are symmetrically fixed at both ends of the top surface of the lower wing plate along the length direction. A downwardly inclined sliding groove is provided on the outer side of the top of the lower mounting platform, and the cross-sectional shape of the sliding groove is an inverted T-shape.

[0017] When the above technical solution is implemented, the width of the lower sliding groove is the same as that of the upper sliding groove, the length is greater than that of the upper sliding groove, and the center planes of the lower sliding groove and the upper sliding groove are misaligned in the width direction.

[0018] When the above technical solution is implemented, the backup energy-consuming component includes a rectangular steel plate with both the top and bottom surfaces being downward sloped, and ear plates extending symmetrically outward from the top and bottom surfaces of the rectangular steel plate.

[0019] When the above technical solution is implemented, wear-resistant rubber plates are fixed to the top and bottom surfaces of the spare energy-consuming component, respectively.

[0020] When the above technical solution is implemented, the outer side of the upper mounting platform is connected to the upper constraint member of the spare energy-consuming component. The upper constraint member is a horizontal L-shaped plate, and the upper constraint members on both sides are arranged anti-symmetrically.

[0021] When the above technical solution is implemented, the top surface of the lower mounting platform is connected to the lower constraint member of the spare energy-consuming component, and the lower constraint member is an inverted U-shaped plate.

[0022] In this invention, the main body of the damping unit includes an initial energy-dissipating component and a spare energy-dissipating component arranged parallel to it. When the initial energy-dissipating component is sheared and damaged, the spare energy-dissipating component automatically changes position to replace the initial energy-dissipating component in terms of support and energy dissipation, thus performing self-repair of the damping unit and protecting the bearing from seismic damage, thereby preventing beam collapse. Specifically, the initial energy-dissipating component functions as a traditional damper, absorbing seismic energy to a large extent and protecting the seismic isolation bearing and pier from seismic damage. When a small earthquake occurs, the initial energy-dissipating component undergoes slight deformation, consuming a certain amount of seismic energy. Because the deformation is small, the spare energy-dissipating component remains in its initial installation position, and the seismic isolation bearing itself mainly resists the seismic force. When a large earthquake occurs, the initial energy-dissipating component undergoes significant shear deformation and damage. The spare energy-dissipating component slides towards the initial energy-dissipating plate to provide support and energy dissipation, protecting the seismic isolation bearing at the top of the pier from damage, thereby preventing beam collapse. In short, this device can continue to support and dissipate energy by automatically changing the position of the backup energy-dissipating component after the initial energy-dissipating component is sheared and damaged by seismic energy, thus enabling the self-repair of the damping unit and protecting the support from seismic damage, thereby preventing beam collapse. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the isometric structure under normal conditions according to an embodiment of the present invention.

[0024] Figure 2 is an enlarged structural diagram of the main body of the damping unit in Figure 1.

[0025] Figure 3 is a front view of Figure 2.

[0026] Figure 4 is a schematic diagram of the structure after removing the spring and its mounting structure from Figure 2.

[0027] Figure 5 is an enlarged structural schematic diagram of the upper wing plate and the upper mounting platform assembly in Figure 4.

[0028] Figure 6 is an enlarged structural schematic diagram of the lower wing plate and the lower mounting platform assembly in Figure 4.

[0029] Figure 7 is an enlarged structural schematic diagram of the spare energy-consuming component in Figure 4. Detailed Implementation

[0030] As shown in Figure 1, the self-healing high-speed railway bridge vibration reduction device disclosed in this embodiment includes a vibration damping and isolation bearing 3 disposed between the precast pier 2 and the beam 1, and vibration damping units 4 symmetrically disposed on both sides of the vibration damping and isolation bearing 3.

[0031] The damping unit 4 includes the unit body and the pre-embedded components connected to its upper and lower sides respectively.

[0032] As can be seen from Figures 2 to 7:

[0033] The main body of the unit includes an upper wing plate 41, a lower wing plate 42, an initial energy-consuming steel plate 43, an upper mounting platform 44, a lower mounting platform 45, a spare energy-consuming steel plate 46, an upper baffle 47, a lower baffle 48, and a horizontal spring 49.

[0034] The upper wing plate 41, the lower wing plate 42, and the initial energy-consuming steel plate 43 are all rectangular steel plates.

[0035] The initial energy-consuming steel plate 43 is welded to the center surface along the length direction between the upper wing plate 41 and the lower wing plate 42.

[0036] The upper mounting platform 44 is symmetrically welded to both ends of the bottom surface of the upper wing plate 41 along the length direction with respect to the initial energy-consuming steel plate 43.

[0037] The bottom surface of the upper mounting platform 44 is a downward slope from the outside to the inside, and an upper sliding groove with the same slope is provided on the outer side of the bottom surface. The cross-sectional shape of the upper sliding groove is T-shaped.

[0038] The lower mounting platform 45 is symmetrically welded to both ends of the top surface of the lower wing plate 42 along the length direction with respect to the initial energy-consuming steel plate 43.

[0039] The top surface of the lower mounting platform 45 is a downward sloping surface from the outside to the inside, and the outer side of the bottom surface is provided with a downward sliding groove of the same slope. The cross-sectional shape of the downward sliding groove is an inverted T shape.

[0040] The lower mounting platform 45 and the upper mounting platform 44 are staggered to the left and right. The outer side of the lower mounting platform is outside the outer side of the upper mounting platform. The length of the lower sliding groove is greater than the length of the upper sliding groove, and the inner end face of the upper sliding groove is outside the inner end face of the lower sliding groove.

[0041] The center planes of the lower sliding groove and the upper sliding groove are misaligned in the width direction to facilitate the installation and initial positioning of the spare energy-consuming steel plate, and to allow the spare energy-consuming steel plate 46 to slide and change position after the initial energy-consuming steel plate 43 is sheared and damaged.

[0042] The spare energy-consuming steel plate 46 includes a rectangular plate body and ear plates that extend symmetrically on the top and bottom sides.

[0043] Rubber sheets are glued to the top and bottom surfaces of the spare energy-consuming steel plate 46, respectively, as shown in the figure.

[0044] During assembly, the spare energy-consuming steel plate 46 slides into the lower mounting platform 45 through the bottom ear plate as a guide structure until the top inner side of the spare energy-consuming steel plate contacts the outer side of the upper mounting platform 44.

[0045] A horizontal spring 49 is installed between the spare energy-consuming steel plate 46 and the initial energy-consuming steel plate 43 to keep the spare energy-consuming steel plate in a vertical position after installation.

[0046] Multiple rows and columns of connecting rods are provided on both sides of the initial energy-consuming steel plate 43 and on the inner side of the spare energy-consuming steel plate 46. A connecting ring is provided at the end of each connecting rod, and the two ends of the horizontal spring 49 are fixed to the connecting ring.

[0047] After the spare energy-consuming steel plate 46 is assembled, the upper baffle 47 and the lower baffle 48 are welded onto the upper mounting platform 44 and the lower mounting platform 45, respectively.

[0048] The upper baffle 47 is a horizontal L-shape and is welded to the outside of the upper mounting platform 44, with the long arm located outside the spare energy-consuming steel plate.

[0049] The upper baffles 47 on the two upper mounting platforms 44 are arranged in an anti-symmetrical manner.

[0050] The lower baffle 48 is an inverted U-shape and is welded to the outer side of the top surface of the lower mounting platform 45, corresponding to the outer side of the spare energy-consuming steel plate.

[0051] When the unit is manufactured in the factory, the upper wing plate 41 is welded to the upper mounting platform 44 as a whole, and the lower wing plate 42 is welded to the lower mounting platform 45 as a whole. Then, they are welded together into an I-shaped integral component through the initial energy-consuming steel plate 43.

[0052] The spare energy-consuming steel plate 46 will not be installed yet, so the horizontal spring 49 will not be installed either.

[0053] The upper baffle 47 and the lower baffle 48 are not welded to the upper and lower wing plates.

[0054] The embedded components adopt a conventional structure (not shown in the figure), including rectangular steel plates that match the upper and lower flanges and several high-strength bolts, with high-strength nuts at both ends of the bolts.

[0055] The rectangular steel plate has the same planar dimensions as the upper and lower wing plates of the unit body. It is connected to the upper and lower wing plates of the unit body by bolts and then locked with high-strength nuts.

[0056] The rectangular steel plate and its upper and lower flanges are provided with four rows of round holes along the width direction, including two rows at both ends and two rows in the middle that are symmetrical about the center plane in the length direction.

[0057] During factory production, rectangular steel plates are paired with upper and lower flanges to machine round holes to ensure accurate alignment of the round holes.

[0058] When the piers and beams are prefabricated in the factory, the rectangular steel plates of the pre-embedded components are assembled and fixed with the bolts and embedded.

[0059] When the damping unit 4 is assembled on the construction site, the lower flange 42 of the main body of the unit is first fixed to the bolt of the pre-embedded component extending from the upper end of the pier column with a high-strength nut.

[0060] Then, the bottom of the spare energy-consuming steel plate 46 is slid into the lower groove from the outside of the lower mounting platform 45 until the top inner side of the spare energy-consuming steel plate 46 is in contact with the outer side of the upper mounting platform 44.

[0061] Then weld the upper baffle 47 onto the upper mounting platform 44 and the lower baffle 48 onto the lower mounting platform 45. Note that the upper baffles 47 on both sides are in opposite directions.

[0062] Finally, a horizontal spring 49 is installed between the spare energy-consuming steel plate 46 and the initial energy-consuming steel plate 43.

[0063] During the installation of beam 1, the bolts extending from the pre-embedded components on its bottom surface are locked to the upper flange of the damping unit 4 with high-strength nuts.

[0064] The working principle of this device is as follows:

[0065] The initial energy-dissipating steel plate acts as a traditional damper, absorbing seismic energy to a large extent and protecting the seismic isolation bearings and piers from earthquake damage.

[0066] When a minor earthquake occurs, the initial energy-dissipating steel plate undergoes slight deformation, absorbing some seismic energy. Since the deformation is small, the backup energy-dissipating steel plate remains in its initial installation position. At this time, the seismic isolation bearings themselves mainly resist the seismic force. Simultaneously, the backup energy-dissipating steel plate is blocked and limited by upper and lower baffles.

[0067] When a major earthquake occurs, the initial energy-dissipating steel plate undergoes significant shear deformation and failure, resulting in a longitudinal displacement difference between the upper and lower flanges. When the upper sliding groove on the upper mounting platform aligns with the lower sliding groove on the lower mounting platform, the spare energy-dissipating steel plate slides along the upper and lower sliding grooves towards the initial energy-dissipating plate until the spare energy-dissipating steel plate slides to the inner end limit of the upper sliding groove.

[0068] During the inward sliding process of the spare energy-dissipating steel plate, it can dissipate energy through friction of the rubber plates at both ends. After sliding into place, it plays a supporting role in energy dissipation, protecting the seismic isolation bearing at the top of the pier from damage, thereby avoiding beam collapse.

[0069] Because the thickness and material of the initial energy-consuming steel plate are different, the amount of deformation when it is sheared will be different. Therefore, the misalignment difference between the center planes of the upper and lower grooves in the width direction needs to be calculated according to the specific parameters of the initial energy-consuming steel plate, which is generally taken as about 10 millimeters.

[0070] Spare energy-dissipating steel plates are symmetrically set on both sides of the initial energy-dissipating steel plate. Since the longitudinal displacement difference between the upper and lower flanges under seismic action can be to the left or to the right, two sets of spare energy-dissipating components are set to ensure that the spare energy-dissipating steel plates can play a role in both situations.

[0071] In short, after the initial energy-dissipating steel plate is sheared and damaged by seismic energy, this device can automatically change position through backup energy-dissipating components to continue supporting and dissipating energy, thereby enabling the self-repair of the damping unit, protecting the support from seismic damage, and thus preventing beam collapse.

Claims

1. A vibration damping device for high-speed railway bridges capable of active replacement and repair after damage, comprising a seismic isolation bearing installed on the top of a precast pier, and vibration damping units symmetrically arranged on both sides of the seismic isolation bearing, wherein the main body of each vibration damping unit is connected and fixed to the beam and the precast pier through pre-embedded components, characterized in that: The unit body includes an initial energy-dissipating component and a spare energy-dissipating component arranged parallel to it. When the initial energy-dissipating component is sheared and damaged, the spare energy-dissipating component can automatically change position to replace the initial energy-dissipating component in terms of support and energy dissipation, thus performing self-repair of the damping unit. The unit body also includes an I-shaped plate structure, with the initial energy-dissipating component connected between the center planes of its upper and lower flanges along its length. The initial energy-dissipating component is a rectangular steel plate. The upper mounting platform of the spare energy-dissipating component is symmetrically fixed at both ends of the bottom surface along the length of the upper flange, and a downwardly inclined upper sliding groove is provided on the outer bottom of the upper mounting platform. The lower mounting platform of the spare energy-dissipating component is symmetrically fixed at both ends of the top surface along the length of the lower flange, and a downwardly inclined lower sliding groove is provided on the outer top of the lower mounting platform. The cross-sectional shape of the upper sliding groove is T-shaped, and the cross-sectional shape of the lower sliding groove is inverted T-shaped. The width of the lower sliding groove is the same as that of the upper sliding groove, and the length is... The length of the upper sliding groove is greater than that of the upper sliding groove, and the center planes of the lower sliding groove and the upper sliding groove are misaligned in the width direction; the outer side of the upper mounting platform is connected to the upper constraint member of the spare energy-consuming component, which is a horizontal L-shaped plate, and the upper constraint members on both sides are anti-symmetrically arranged; the top surface of the lower mounting platform is connected to the lower constraint member of the spare energy-consuming component, which is an inverted U-shaped plate; the spare energy-consuming component includes a rectangular steel plate with both the top and bottom surfaces being downward sloping surfaces, and ear plates extending symmetrically outward from the top and bottom surfaces of the rectangular steel plate to both sides; there are two sets of spare energy-consuming components, symmetrically arranged on both sides of the initial energy-consuming component; when assembling the spare energy-consuming component, it slides into the lower sliding groove on the lower mounting platform through the ear plates at the bottom as a guide structure until the inner top of the rectangular steel plate contacts the outer side of the upper mounting platform; a horizontal spring is set between the spare energy-consuming component and the initial energy-consuming component to maintain the vertical state of the spare energy-consuming component after installation.

2. The high-speed railway bridge vibration damping device capable of active replacement and repair after damage as described in claim 1, characterized in that: Rubber plates are fixed to the top and bottom surfaces of the backup energy-consuming component.

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