A combined energy dissipation device for high-speed railway bridge

Abstract

The application discloses a combined energy dissipation and shock absorption device for high-speed railway bridges, which is arranged symmetrically on both sides of a seismic isolation bearing between a prefabricated pier column and a prefabricated bridge, and is connected with the prefabricated bridge and the prefabricated pier column through mounting members at the bottom and the top. The device comprises multiple groups of connecting members which are uniformly arranged between the mounting members, and a viscoelastic energy dissipation unit, a bending energy dissipation unit and a limiting shear plate energy dissipation unit which are sequentially arranged between adjacent connecting members from top to bottom. The adjacent connecting members are connected and fixed with the mounting members at the top of the prefabricated pier column and the lower side of the prefabricated bridge body respectively only through the bottom surface and the top surface. In a normal state, the seismic isolation bearing, the viscoelastic energy dissipation unit and the bending energy dissipation unit provide small rigidity to resist variable loads such as wind load and temperature effect, and the shear plate energy dissipation unit does not work. In a small earthquake, the viscoelastic energy dissipation unit and the bending energy dissipation unit provide small rigidity to resist horizontal seismic action. In a large earthquake, the limiting shear plate energy dissipation unit provides large rigidity to resist horizontal seismic action.

Description

Technical Field

[0001] This invention belongs to the field of bridge vibration reduction, specifically a combined energy dissipation and vibration reduction device for high-speed railway bridges with phased energy consumption. Background Technology

[0002] Under seismic loading, damage to high-speed railway bridge-track systems is primarily concentrated on the piers, bearings, and track structure. Since the track structure is relatively fixed, current seismic research on high-speed railway bridge-track systems mainly focuses on the piers and bearings. Among these, seismic isolation bearing systems have become an important direction in high-speed railway seismic research due to their advantages such as more flexible layout, more controllable cost, and wider applicability.

[0003] Current seismic isolation bearings mainly include lead-core rubber bearings and friction pendulum bearings, which combine the vertical support function and lateral force resistance function of the bearing. However, these integrated seismic isolation bearings have problems such as unclear force transmission paths and ambiguous component functions.

[0004] To address the aforementioned issues, some scholars have proposed a separate support system consisting of a bearing and an energy dissipation / damping device. This system decouples the vertical support and lateral force resisting functions of the bearing system, significantly increasing its reliability. However, existing functionally separate bearing systems still suffer from the following problems:

[0005] Energy dissipation and damping devices also play a role when an earthquake has not occurred, and have a certain impact on energy dissipation and reduction during normal use of the bearing system;

[0006] Replacing energy dissipation and vibration reduction devices is difficult and time-consuming, which is not conducive to the rapid recovery of the post-earthquake function of the high-speed railway train-track-bridge system. Summary of the Invention

[0007] The purpose of this invention is to provide a combined high-speed railway bridge energy dissipation and vibration reduction device that does not affect the normal function of the seismic isolation bearings, but can provide high stiffness energy dissipation in stages during major earthquakes.

[0008] The present invention provides a staged energy dissipation and vibration reduction device for high-speed railway bridges, symmetrically arranged on both sides of the seismic isolation bearings between precast piers and precast bridges. The bottom and top of the energy dissipation and vibration reduction device are connected to the precast bridge and precast piers respectively through mounting components. The energy dissipation and vibration reduction device includes multiple sets of connecting components evenly distributed among the mounting components, and viscoelastic energy dissipation units, bending energy dissipation units, and limiting shear plate energy dissipation units arranged sequentially from top to bottom between adjacent connecting components; adjacent connecting components are only connected and fixed to the mounting components on the top of the precast pier and the lower side of the precast beam, respectively, on their bottom and top surfaces.

[0009] In one embodiment of the above-mentioned device, the installation component includes a rectangular steel plate and multiple rows of L-shaped anchor rods. The long arm of the L-shaped anchor rod is detachably connected to the rectangular steel plate, and the short arm is embedded in the precast beam and precast pier.

[0010] In one embodiment of the above-mentioned device, there are three sets of connecting members, namely rectangular steel pipes with a large length-to-width ratio, which are connected between the rectangular steel plates with the width direction as the bottom and top surfaces. The top surface of the middle connecting member is fixed to the rectangular steel plate of the precast beam underside installation member, and the bottom surfaces of the left and right connecting members are fixed to the rectangular steel plate of the precast pier top installation member.

[0011] In one embodiment of the above-mentioned device, the viscoelastic energy dissipation unit includes a rectangular pad, a rectangular steel pipe with a large aspect ratio, and a viscoelastic plate. The rectangular pad is arranged vertically, and the rectangular steel pipe is fixed to one side of the rectangular pad with its top and bottom surfaces centered in the width direction. The two sets of rectangular pads and rectangular steel pipes are arranged with the rectangular steel pipes facing each other, and the viscoelastic plate is connected between the two rectangular steel pipes.

[0012] In one embodiment of the above-described device, the viscoelastic plate is a rubber plate or a polyurethane plate.

[0013] In one embodiment of the above-described device, the bending energy dissipation unit includes two rectangular pads and a curved panel connected between them.

[0014] In one embodiment of the above-described device, the cross-section of the curved panel is a symmetrical curved surface.

[0015] In one embodiment of the above-mentioned device, the limiting shear plate energy-consuming unit includes a rectangular thin plate, sleeves, pins, springs, a rectangular connecting plate, a rectangular sealing plate, a shear plate, a rectangular pad, and a sliding plate; two sets of four sleeves are symmetrically connected on both sides of the rectangular thin plate along its length direction; through holes are provided on the rectangular thin plate at the positions corresponding to the sleeves; pins and springs are sequentially installed in each sleeve; the outer ends of the sleeves on the same side are connected as one piece by the rectangular connecting plate; the rectangular connecting plate has through holes at the positions corresponding to the sleeves; the rectangular connecting plate is detachably connected to the rectangular sealing plate by bolts; the shear plate is a rectangular plate. One rectangular plate is centered on the center plane of the rectangular thin plate in the width direction, and its outer end is connected to a rectangular pad plate arranged parallel to and opposite to the rectangular thin plate. The rectangular pad plate and the rectangular thin plate have the same planar dimensions. Another rectangular pad plate is centered on one side and connected to a sliding groove plate. A through hole is set at the middle position of the sliding groove on the rectangular pad plate. The two rectangular pad plates are arranged opposite each other. A pin is inserted into the sliding groove on the sliding groove plate. After the pin slides a certain distance along the sliding groove on the sliding groove plate, it can be inserted into the through hole on the rectangular pad plate by the compression of the spring to realize the overall assembly of the limiting shear plate energy dissipation unit.

[0016] In one embodiment of the above-mentioned device, when the viscoelastic energy dissipation unit, the bending energy dissipation unit, and the limiting shear plate energy dissipation unit are assembled with the connecting member, the rectangular pad is respectively attached to the side wall of the corresponding side connecting member and locked by bolts passing through the connecting member and nuts.

[0017] In one embodiment of the above-mentioned device, baffles for the pins are symmetrically arranged at the bottom of the inner cavity of the middle connecting member, corresponding to the rectangular pad positions of the energy-consuming units of the limiting shear plates on both sides.

[0018] In normal use, the viscoelastic and bending energy-dissipating units in the seismic isolation bearing and energy dissipation device provide a small stiffness to resist variable loads such as wind loads and temperature effects, while the shear plate energy-dissipating unit slides in the groove on the sliding plate and does not function. During minor earthquakes, the entire energy dissipation device still relies on the viscoelastic and bending energy-dissipating units to provide a small stiffness to resist horizontal seismic forces. During major earthquakes, when the displacement of the pin in the limiting shear plate energy-dissipating unit on the sliding plate reaches a certain value, the pin faces the circular hole on the lower pad. The spring force allows the pin to pass through the circular hole, connecting the upper and lower parts of the limiting shear plate energy-dissipating unit into a single unit, thus providing a large stiffness to resist horizontal seismic forces. Whether in normal use or during an earthquake, the vertical load of the entire superstructure is transferred to the piers through the seismic isolation bearing, achieving separation of the vertical support function and lateral force resistance function of the bearing system, greatly increasing the reliability of the bearing system. Furthermore, all components of the energy dissipation and vibration reduction device can be manufactured in factories, resulting in a high degree of industrialization. The components are transported to the construction site for assembly, avoiding unfavorable factors such as unstable construction quality. The energy dissipation unit is connected to the connection unit, and the connection unit is connected to the installation unit, all using high-strength bolts. This facilitates rapid replacement after an earthquake and promotes the quick recovery of the high-speed railway train-track-bridge system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the axial structure in the working state of an embodiment of the present invention.

[0020] Figure 2 for Figure 1 A schematic diagram of the axial structure with the beams hidden.

[0021] Figure 3 for Figure 2 Enlarged axial side structure diagram of the energy dissipation and vibration reduction device.

[0022] Figure 4 for Figure 3 A side view diagram.

[0023] Figure 5 This is a magnified axial structure diagram of a viscoelastic energy dissipation unit.

[0024] Figure 6 This is a front view of a viscoelastic energy dissipation unit.

[0025] Figure 7 This is a side view of a viscoelastic energy dissipation unit.

[0026] Figure 8 This is a schematic diagram of the axial structure of the bending energy dissipation unit.

[0027] Figure 9 This is a front view of the bending energy dissipation unit.

[0028] Figure 10 This is a side view of the bending energy dissipation unit.

[0029] Figure 11 This is a schematic diagram of the axial structure of the energy-consuming unit for the limiting shear plate.

[0030] Figure 12 This is a front view of the energy-consuming unit of the limiting shear plate.

[0031] Figure 13 This is a side view of the energy-consuming unit of the limiting shear plate. Detailed Implementation

[0032] Combination Figures 1 to 4 As can be seen, the combined high-speed railway bridge energy dissipation and vibration reduction device 4 disclosed in this embodiment is installed on both sides of the vibration isolation bearing 3 between the precast pier 2 and the precast beam 1. It includes an installation component 41, a connecting component 42, a viscoelastic energy dissipation unit 43, a bending energy dissipation unit 44, a limiting shear plate energy dissipation unit 45, and a baffle 46.

[0033] The mounting components 41 on both sides of the shock absorber 3 have two symmetrically arranged upper and lower sets. Each set includes a rectangular steel plate and an L-shaped anchor rod. The rectangular steel plate has three rows of anchor rod mounting holes arranged at equal intervals in the width direction. The L-shaped anchor rod is arranged with its horizontal arm facing outwards and its vertical wall is welded to the anchor rod mounting hole for fixation. The end section of the vertical arm is a threaded section that extends out of the anchor rod mounting hole.

[0034] The horizontal arm of the installation component 41 is anchored to the precast pier 2 and the precast beam 1 respectively, and the rectangular steel plate is located on the top surface of the precast pier and the bottom surface of the precast beam respectively.

[0035] The connecting component 42 is a rectangular steel pipe with a large length-to-width ratio.

[0036] When the connecting component 42 is assembled with the mounting component 41, the three sets of connecting components are arranged with the two sides of the cross-section width direction as the top and bottom surfaces. The top surface of the middle set is welded and fixed to the rectangular steel plate of the upper mounting component. The other two sets are arranged symmetrically about the middle set, and their bottom surfaces are welded and fixed to the rectangular steel plate of the lower mounting component respectively.

[0037] Combination Figures 2 to 13 It can be seen that:

[0038] The viscoelastic energy dissipation unit 43 includes rectangular pads 431, thin-walled rectangular steel pipes 432, and viscoelastic plates 433. Two thin-walled rectangular steel pipes 432 are welded and fixed to one side of each of the two rectangular pads 431 to form two integral components. The two integral components are arranged facing each other with the thin-walled rectangular steel pipes in between. The viscoelastic plate 433 is clamped and fixed between the two thin-walled rectangular steel pipes. The viscoelastic plate can be made of various types of rubber or polyurethane, with natural rubber being the preferred choice.

[0039] The bending energy dissipation unit 44 includes a rectangular pad 441 and a bending plate 442. The bending plate 442 has an overall U-shaped shape. The two rectangular pads 441 are arranged facing each other, and the two bending plates are clamped at both ends between the two rectangular pads with their openings facing outwards. Of course, other embodiments may provide the bending plate with an S-shaped or other symmetrical bending plate structure.

[0040] The energy-consuming unit 45 of the limiting shear plate consists of two parts.

[0041] One part includes a rectangular thin plate 455, a sleeve 456, a pin 457, a spring 458, a rectangular connecting plate 459, a rectangular sealing plate 459A, a shearing plate 453, and a first rectangular pad 451; the other part includes a second rectangular pad 452 and a sliding plate 454.

[0042] Two sets of four sleeves 456 are symmetrically connected on both sides of the rectangular thin plate 455 along its length. Through holes are provided on the rectangular thin plate 455 at the positions corresponding to the sleeves 456. A pin 457 and a spring 458 are sequentially installed in each sleeve. The outer ends of the sleeves 456 on the same side are connected as one piece by a rectangular connecting plate 459. Through holes are provided on the rectangular connecting plate 459 at the positions corresponding to the sleeves. The rectangular connecting plate 459 is detachably connected to the rectangular sealing plate 459A by bolts.

[0043] The shearing plate 453 is a rectangular plate, which is centered on the center plane of the rectangular thin plate 455 in the width direction. Its outer end is connected to the first rectangular pad 451, which is arranged parallel to and opposite to the rectangular thin plate 455. The first rectangular pad 451 has the same planar dimensions as the rectangular thin plate 455.

[0044] The second rectangular pad 452 is connected to the slide plate 454 on one side, and a through hole is provided on the second rectangular pad 452 at the middle position corresponding to the slide groove.

[0045] When assembling the two parts of the limiting shear plate energy dissipation unit 45, the first rectangular pad 451 and the second rectangular pad 452 are arranged facing each other. The pin 457 is inserted into the groove on the slide plate 454. After the pin 457 slides a certain distance along the groove on the slide plate 454, it can be inserted into the through hole on the second rectangular pad 452 by the compression of the spring 458 to realize the overall assembly of the limiting shear plate energy dissipation unit.

[0046] The energy-consuming unit 45 of the limiting shear plate can be replaced with other similar energy-consuming units that can realize rigid body displacement or small stiffness displacement, and the energy consumption form of the middle energy-consuming area can also be changed to bending, friction, tension and compression and torsion.

[0047] The aforementioned viscoelastic energy dissipation unit 43, bending energy dissipation unit 44, and limiting shear plate energy dissipation unit 45 are arranged sequentially from top to bottom between adjacent connecting members. The rectangular pads on both sides of each unit are respectively attached to the side walls of the corresponding connecting members, and then locked in place by bolts and nuts passing through the connecting members. Figure 3 and Figure 4 As shown:

[0048] The rectangular pads on the outer sides of the left and right viscoelastic energy dissipation units 43 are locked by bolts and nuts passing through the connecting members on both sides, while the rectangular pads on the inner sides are locked by bolts and nuts passing through the connecting member in the middle.

[0049] The rectangular pads on the outer side of the left and right bending energy dissipation units 44 and the outer arms of the bending plates are locked by bolts and nuts passing through the connecting members on both sides, while the rectangular pads on the inner side and the inner arms of the bending plates are locked by bolts and nuts passing through the connecting members in the middle.

[0050] The first rectangular pads 451 of the left and right limiting shear plate energy dissipation units 45 are locked by bolts and nuts passing through the connecting members on both sides. Their inner sides are not fixed to the connecting member in the middle. Instead, through holes are provided at the bottom of the connecting member corresponding to the pin positions, and rectangular baffles are fixed to the inner wall of the connecting member.

[0051] All bolts and nuts are made of high strength.

[0052] The phased energy dissipation principle of the installed energy dissipation and vibration damping device is as follows:

[0053] Under normal use, the viscoelastic energy dissipation unit 43 and the bending energy dissipation unit 44 in the vibration damping and isolation bearing 3 and the energy dissipation and damping device 4 can provide a small stiffness to resist variable loads such as wind load and temperature effect. The limiting shear plate energy dissipation unit 45 can slide in the slide plate on the slide plate 454 through the pin 457 and does not play a role.

[0054] When a minor earthquake occurs, the entire energy dissipation and damping device still provides a small stiffness to resist horizontal seismic forces through viscoelastic energy dissipation units and bending energy dissipation units.

[0055] When a major earthquake occurs, when the displacement of the pin 457 of the limiting shear plate energy dissipation unit 45 on the sliding plate 454 reaches a certain value, the pin 457 is directly opposite the through hole on the second rectangular pad 452. With the elastic force of the spring 458, it passes through the round hole, so that the left and right parts of the limiting shear plate energy dissipation unit 45 are connected into a whole, thereby providing a large rigidity to resist horizontal earthquake action.

[0056] Therefore, this device has the following advantages:

[0057] Whether under normal use or during an earthquake, the vertical load of the entire superstructure is transferred to the piers through the seismic isolation bearings, which can separate the vertical support function and the lateral force resisting function of the bearing system, greatly increasing the reliability of the bearing system.

[0058] All components of the energy dissipation and vibration reduction device can be manufactured in the factory, with a high degree of industrialization. The components are transported to the construction site for assembly, which can avoid adverse factors such as unstable construction quality.

[0059] The components are connected by high-strength bolts, allowing for quick replacement after an earthquake, which is beneficial for the rapid restoration of the functions of the high-speed railway train-track-bridge system after an earthquake.

[0060] The replacement process for this energy dissipation and vibration reduction device at the construction site is as follows:

[0061] (1) Remove the bolts and nuts between the energy-consuming unit and the connecting component at the point where the replacement is needed, and disassemble the energy-consuming unit.

[0062] (2) If the connecting component needs to be replaced, unscrew the nut between the screw of the mounting component and the rectangular steel pipe of the connecting component, replace it with a new rectangular steel pipe, and tighten the nut again to fix it; if the connecting component does not need to be replaced, skip this step.

[0063] (3) Install the new energy-consuming unit between two adjacent thin-walled rectangular steel pipes, and then tighten it with bolts and nuts.

Claims

1. A staged energy dissipation and vibration reduction device for a combined high-speed railway bridge, symmetrically arranged on both sides of the seismic isolation bearing between precast piers and precast bridges, wherein the bottom and top of the energy dissipation and vibration reduction device are respectively connected to the precast bridge and precast piers via mounting components, characterized in that: The energy dissipation and vibration reduction device includes multiple sets of connecting members evenly distributed between the mounting components, and a viscoelastic energy dissipation unit, a bending energy dissipation unit, and a limiting shear plate energy dissipation unit arranged sequentially from top to bottom between adjacent connecting members; When installing the connecting components, only the top or bottom surface is fixed to the corresponding mounting component, and the top and bottom surfaces of adjacent connecting components are fixed alternately. The limiting shear plate energy dissipation unit includes a rectangular thin plate, a sleeve, a pin, a spring, a rectangular connecting plate, a rectangular sealing plate, a shear plate, a rectangular pad, and a sliding plate; Two sets of four sleeves are symmetrically connected on both sides of the length of the rectangular thin plate. Through holes are provided on the rectangular thin plate at the corresponding sleeve positions. Pins and springs are installed in sequence inside each sleeve. The outer ends of the sleeves on the same side are connected as one piece by a rectangular connecting plate. Through holes are provided on the rectangular connecting plate at the corresponding sleeve positions. The rectangular connecting plate is detachably connected to the rectangular sealing plate by bolts. The shearing plate is a rectangular plate, centered on the center plane of the rectangular thin plate in the width direction. The outer end is connected to a rectangular pad plate arranged parallel to and opposite the rectangular thin plate. The rectangular pad plate has the same planar dimensions as the rectangular thin plate. A sliding groove plate is connected to one side of another rectangular pad plate. A through hole is provided on the rectangular pad plate at the middle position of the corresponding sliding groove. The two rectangular pad plates are arranged facing each other. A pin is inserted into the sliding groove on the sliding groove plate. After the pin slides a certain distance along the sliding groove on the sliding groove plate, it can be inserted into the through hole on the rectangular pad plate by the compression of the spring to realize the overall assembly of the shearing plate energy consumption unit. When the viscoelastic energy dissipation unit, bending energy dissipation unit, and limiting shear plate energy dissipation unit are assembled with the connecting member, the rectangular pad is respectively attached to the side wall of the corresponding side connecting member and locked by bolts passing through the connecting member and nuts.

2. The combined energy dissipation and vibration absorption device for high-speed railway bridge according to claim 1, characterized in that: The installation components include a rectangular steel plate and multiple rows of L-shaped anchor rods. The long arm of the L-shaped anchor rod is detachably connected to the rectangular steel plate, and the short arm is embedded in the precast beam and precast pier.

3. The combined energy dissipation and vibration absorption device for high-speed railway bridge according to claim 2, characterized in that: The connecting components consist of three sets: rectangular steel pipes with a large length-to-width ratio, which are connected between the rectangular steel plates with the width direction as the bottom and top surfaces. The top surface of the middle connecting component is fixed to the rectangular steel plate of the precast beam mounting component, and the bottom surfaces of the left and right connecting components are fixed to the rectangular steel plate of the precast pier top mounting component.

4. The combined energy dissipation and vibration absorption device for high-speed railway bridge according to claim 2, characterized in that: The viscoelastic energy dissipation unit includes a rectangular pad, a rectangular steel pipe with a large length-to-width ratio, and a viscoelastic plate. The rectangular pad is arranged vertically, and the rectangular steel pipe is fixed to one side of the rectangular pad with its top and bottom surfaces centered in the width direction. The two sets of rectangular pads and rectangular steel pipes are arranged with the rectangular steel pipes facing each other, and the viscoelastic plate is connected between the two rectangular steel pipes.

5. The combined energy dissipation and vibration absorption device for high-speed railway bridge according to claim 4, characterized in that: The viscoelastic plate is a rubber plate or a polyurethane plate.

6. The combined energy dissipation and vibration absorption device for high-speed railway bridge according to claim 5, characterized in that: The bending energy dissipation unit includes two rectangular pads and a curved panel connecting them.

7. The combined energy dissipation and vibration absorption device for high-speed railway bridge according to claim 6, characterized in that: The cross-section of the curved panel is a symmetrical curved surface.

8. The combined energy dissipation and vibration absorption device for high-speed railway bridge according to claim 1, characterized in that: The blocking plates of the pin are symmetrically arranged at the positions of the rectangular pads of the energy dissipation units of the limiting shear plates on both sides of the bottom of the inner wall of the intermediate connecting member.

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