A railway self-resetting bridge pier with an additional energy dissipation device at the pier base

Abstract

This utility model belongs to the field of bridge seismic isolation and damping technology, specifically relating to a railway self-resetting bridge pier with an additional energy dissipation device at the pier base. The pier includes a column, an enlarged foundation, and a pile foundation cap. The column and the enlarged foundation are bonded together. A separation surface is provided between the enlarged foundation and the pile foundation cap. It also includes a liquid viscous damper, externally positioned between the enlarged foundation and the pile foundation cap. In this utility model, installing a viscous damper energy dissipation device between the enlarged foundation and the pile foundation cap increases the pier's energy dissipation capacity, limits lift-off displacement, reduces pier top displacement, and improves the pier's performance. During the swing lift-off process, the liquid viscous damper dissipates energy through fluid friction in reciprocating tension. This reduces the damage to the main body of the bridge pier caused by seismic forces, maximizing the safety of the bridge structure. The viscous damper energy dissipation device is simple and convenient to replace when damaged.

Description

Technical Field

[0001] This utility model belongs to the field of bridge seismic isolation technology, and specifically relates to a railway self-resetting bridge pier with an additional energy dissipation device at the pier bottom. Background Technology

[0002] While ductile piers can prevent collapse, they suffer from large residual displacement after earthquakes and are difficult to repair. In recent years, with the shift in seismic design philosophy for bridge piers from ductile to ductile design, self-setting piers have gradually become a research hotspot. Under seismic loading, self-setting piers can sway and isolate the pier, significantly reducing the seismic force on it and thus decreasing the possibility of plastic zone failure. They can achieve damage control, have advantages such as small residual displacement, and exhibit superior seismic performance compared to ductile piers.

[0003] Self-resetting bridge piers do not lift off under normal use and minor earthquakes, but can lift off and sway under major earthquakes to isolate the structure and reduce seismic response at the pier base. Related studies indicate that self-resetting bridge piers have relatively weak energy dissipation capacity and may experience significant pier top displacement under seismic loading, potentially leading to overturning. Furthermore, because self-resetting bridge piers release pier base constraints and have relatively low horizontal lateral stiffness, while railway bridges require sufficient train rigidity, this could threaten the safe operation of the piers. Utility Model Content

[0004] The purpose of this utility model is to overcome the problems of low horizontal lateral stiffness and insufficient energy dissipation capacity of railway self-resetting bridge piers in the prior art, and to provide a railway self-resetting bridge pier with an additional energy dissipation device at the bottom of the pier.

[0005] This utility model provides a railway self-resetting bridge pier with an additional energy dissipation device at the pier base, including a pier column, an enlarged foundation, and a pile foundation cap. The pier column and the enlarged foundation are bonded together as one unit. A separation surface is provided between the enlarged foundation and the pile foundation cap. It also includes a liquid viscous damper, which is externally placed between the enlarged foundation and the pile foundation cap.

[0006] In this invention, a viscous damper energy dissipation device is installed between the enlarged foundation and the pile foundation cap. This increases the energy dissipation capacity of the pier, limits lift-off displacement, reduces pier top displacement, and improves the pier's performance. During the swing lift-off process, the liquid viscous damper dissipates energy through fluid friction in reciprocating tension. This reduces the damage to the main pier structure caused by earthquakes and maximizes the safety of the bridge structure. The viscous damper energy dissipation device is easy and convenient to replace if damaged.

[0007] Preferably, along the longitudinal direction of the bridge, the top two ends of the enlarged foundation are provided with extended flanges, and the liquid viscosity damper is disposed between the extended flanges and the enlarged foundation.

[0008] Preferably, the liquid viscous damper is connected to the extended flange and the enlarged foundation through a pre-embedded steel component; the pre-embedded steel component includes a steel plate and multiple reinforcing bars, and the multiple reinforcing bars are bonded to the steel plate.

[0009] More preferably, the liquid viscosity damper and the embedded steel component are welded together.

[0010] Preferably, two liquid viscous dampers are provided on each side of the extended flange in the longitudinal direction of the bridge: one is located between the bottom surface of the extended flange and the pile foundation cap, and the other is located between the side surface of the extended flange and the pile foundation cap. The liquid viscous dampers effectively reduce the seismic response of the bridge piers by dissipating energy.

[0011] More specifically, two liquid viscosity dampers at the same apex of the extended flange form a group, and a total of four groups are provided on the enlarged basis, with one group provided at each apex of the extended flange.

[0012] Preferably, one liquid viscous damper is provided on each side of the extended flange in the longitudinal direction of the bridge, and the liquid viscous damper is disposed between the side of the extended flange and the pile foundation cap; or, the liquid viscous damper is disposed between the bottom surface of the extended flange and the pile foundation cap.

[0013] Preferably, one of the liquid viscosity dampers is provided at each of the four apex positions of the extended flange.

[0014] Preferably, one liquid viscous damper is provided on each side of the extended flange in the longitudinal direction of the bridge, and the liquid viscous damper is disposed between the side of the extended flange and the pile foundation cap; it also includes a sacrificial component, which is disposed between the bottom surface of the extended flange and the pile foundation cap.

[0015] This invention proposes a railway self-resetting bridge pier energy dissipation system with an additional energy dissipation device at the pier base. The sacrificial component enhances the lateral stiffness of the pier, ensuring it meets horizontal stiffness requirements during normal use and guaranteeing safe operation. Under strong earthquakes, the sacrificial component fractures, causing the pier to sway and isolate itself. Furthermore, the viscous damper also dissipates energy and reduces vibration, significantly minimizing seismic response at the pier base and protecting the pier from damage. The fractured sacrificial component can be quickly replaced after an earthquake, rapidly restoring its functionality. This system has significant application potential and represents one application of earthquake-resistant resilient bridges.

[0016] Preferably, the upper end of the sacrificial component extends from the bottom surface of the extended flange to the top surface of the extended flange and is connected by a nut, and the lower end of the sacrificial component is connected to a steel bar partially embedded in the pile foundation cap by a bolt sleeve.

[0017] Preferably, the sacrificial component is an SMA (Superficial Molecular Weight) filament bundle. The sacrificial component can improve the lateral stiffness of the pier, utilize the stretching recovery hysteresis energy dissipation of the SMA filament bundle, and play a reset role, helping the pier to self-reset and avoiding overturning and collapse during an earthquake.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this invention, a viscous damper energy dissipation device is installed between the enlarged foundation and the pile foundation cap. This increases the energy dissipation capacity of the pier, limits lift-off displacement, reduces pier top displacement, and improves the pier's performance. During the swing lift-off process, the liquid viscous damper dissipates energy through fluid friction in reciprocating tension. This reduces the damage to the main pier structure caused by earthquakes and maximizes the safety of the bridge structure. The viscous damper energy dissipation device is easy and convenient to replace if damaged. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0022] Figure 3 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of Embodiment 4 of this utility model.

[0024] Figure 5 This is a schematic diagram of the liquid viscosity damper of this utility model.

[0025] Figure 6 This is a schematic diagram of the sacrificial component in Embodiment 4 of this utility model.

[0026] Marked in the image:

[0027] 1-Pier column, 2-Spread foundation, 21-Extended flange, 3-Sacrificial component, 4-Liquid viscous damper, 5-Pile foundation cap, 6-Separation surface, 7-Nut, 8-Steel pad, 9-Bolt sleeve, 10-Embedded steel component, 101-Steel plate, 102-Reinforcing bar, 11-Threaded steel bar, 12-Hinge seat, 13-Connecting shaft. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0029] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0031] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0032] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0033] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0034] Example 1

[0035] This embodiment discloses a railway self-resetting bridge pier with an additional energy dissipation device at the pier base, such as... Figure 1 , Figure 5 As shown, the structure includes a pier 1, an enlarged foundation 2, and a pile foundation cap 5. The pier 1 and the enlarged foundation 2 are bonded together. A separation surface 6 is provided between the enlarged foundation 2 and the pile foundation cap 5. The structure also includes a liquid viscous damper 4, which is externally positioned between the enlarged foundation 2 and the pile foundation cap 5. Specifically, along the longitudinal direction of the bridge, the top two ends of the enlarged foundation 2 are provided with extended flanges 21, and the liquid viscous damper 4 is disposed between the extended flanges 21 and the enlarged foundation 2.

[0036] The liquid viscous damper 4 is connected to the extended flange 21 and the enlarged foundation 2 via a pre-embedded steel component 10; the pre-embedded steel component 10 includes a steel plate 101 and multiple reinforcing bars 102, which are bonded to the steel plate 101. The liquid viscous damper 4 and the pre-embedded steel component 10 are welded together. Figure 5 As shown, the liquid viscosity damper 4 is provided with hinge shafts at both ends, and the hinge shafts are hinged to the hinge seat 12. The hinge seat 12 is welded to the steel plate 101.

[0037] One liquid viscous damper 4 is provided on each side of the extended flange 21 in the longitudinal direction. The liquid viscous damper 4 is located between the bottom surface of the extended flange 21 and the pile foundation cap 5. One liquid viscous damper 4 is provided at each of the four apex positions of the extended flange 21.

[0038] Example 2

[0039] This embodiment discloses a railway self-resetting bridge pier with an additional energy dissipation device at the pier base, including a pier column 1, an enlarged foundation 2, and a pile foundation cap 5. The pier column 1 and the enlarged foundation 2 are bonded together. A separation surface 6 is provided between the enlarged foundation 2 and the pile foundation cap 5. It also includes a liquid viscous damper 4, which is externally positioned between the enlarged foundation 2 and the pile foundation cap 5. Figure 2 As shown, specifically, along the longitudinal direction of the bridge, the top two ends of the enlarged foundation 2 are provided with extended flanges 21, and the liquid viscosity damper 4 is disposed between the extended flanges 21 and the enlarged foundation 2.

[0040] The liquid viscous damper 4 is connected to the extended flange 21 and the enlarged foundation 2 via a pre-embedded steel component 10; the pre-embedded steel component 10 includes a steel plate 101 and multiple reinforcing bars 102, which are bonded to the steel plate 101. The liquid viscous damper 4 and the pre-embedded steel component 10 are welded together.

[0041] One liquid viscous damper 4 is provided on each side of the extended flange 21 in the longitudinal direction of the bridge, and the liquid viscous damper 4 is disposed between the side of the extended flange 21 and the pile foundation cap 5.

[0042] Example 3

[0043] This embodiment discloses a railway self-resetting bridge pier with an additional energy dissipation device at the pier base, including a pier column 1, an enlarged foundation 2, and a pile foundation cap 5. The pier column 1 and the enlarged foundation 2 are bonded together. A separation surface 6 is provided between the enlarged foundation 2 and the pile foundation cap 5. It also includes a liquid viscous damper 4, which is externally positioned between the enlarged foundation 2 and the pile foundation cap 5. Figure 3 As shown, specifically, along the longitudinal direction of the bridge, the top two ends of the enlarged foundation 2 are provided with extended flanges 21, and the liquid viscosity damper 4 is disposed between the extended flanges 21 and the enlarged foundation 2.

[0044] The liquid viscous damper 4 is connected to the extended flange 21 and the enlarged foundation 2 via a pre-embedded steel component 10. The pre-embedded steel component 10 includes a steel plate 101 and multiple reinforcing bars 102, which are bonded to the steel plate 101. The liquid viscous damper 4 and the pre-embedded steel component 10 are welded together. Two liquid viscous dampers 4 are provided on each side of the extended flange 21 in the longitudinal direction, one between the bottom surface of the extended flange 21 and the pile foundation cap 5, and the other between the side surface of the extended flange 21 and the pile foundation cap 5.

[0045] Two liquid viscosity dampers 4 at the same apex position of the extended flange 21 form a group, and a total of four groups are provided on the enlarged base 2, with one group provided at each apex position of the extended flange 21.

[0046] Example 4

[0047] This embodiment discloses a railway self-resetting bridge pier with an additional energy dissipation device at the pier base, including a pier column 1, an enlarged foundation 2, and a pile foundation cap 5. The pier column 1 and the enlarged foundation 2 are bonded together. A separation surface 6 is provided between the enlarged foundation 2 and the pile foundation cap 5. It also includes a liquid viscous damper 4, which is externally positioned between the enlarged foundation 2 and the pile foundation cap 5. Figure 4As shown, specifically, along the longitudinal direction of the bridge, the top two ends of the enlarged foundation 2 are provided with extended flanges 21, and the liquid viscosity damper 4 is disposed between the extended flanges 21 and the enlarged foundation 2.

[0048] The liquid viscous damper 4 is connected to the extended flange 21 and the enlarged foundation 2 via a pre-embedded steel component 10. The pre-embedded steel component 10 includes a steel plate 101 and multiple reinforcing bars 102, which are bonded to the steel plate 101. The liquid viscous damper 4 and the pre-embedded steel component 10 are welded together. One liquid viscous damper 4 is provided on each side of the extended flange 21 in the longitudinal direction. The liquid viscous damper 4 is located between the side of the extended flange 21 and the pile foundation cap 5. It also includes a sacrificial component 3, such as... Figure 6 As shown, the sacrificial component 3 is disposed between the bottom surface of the extended flange 21 and the pile foundation cap 5. The upper end of the sacrificial component 3 extends from the bottom surface of the extended flange 21 to the top surface of the extended flange 21 and is connected by a nut 7. The lower end of the sacrificial component 3 is connected to a threaded steel bar 11 partially embedded in the pile foundation cap 5 by a bolt sleeve 9.

[0049] Specifically, during the pouring of the pile foundation cap 5, a threaded steel bar 11 is pre-embedded in the pile foundation cap 5, with its end extending outwards by a certain length. The pre-embedded part is equipped with a hook and is threaded, which can enhance the interlocking effect with the concrete. The sacrificial component 3 passes through the reserved through hole in the extended flange 21 of the enlarged foundation 2. The lower part is connected to the threaded steel bar 11 through the bolt sleeve 9, and the upper part is anchored to the enlarged foundation 2 using steel pads 8 and nuts 7. The sacrificial component 3 is made of common HRB400 steel bar 102.

[0050] More specifically, the sacrificial component 3 is an SMA filament bundle. The SMA filament bundle utilizes stretching and recovery hysteresis to dissipate energy and also serves a repositioning function, assisting the bridge pier in self-resetting and preventing it from overturning and collapsing during an earthquake.

[0051] After adjustment, the liquid viscous damper 4 is welded to the 10 pre-embedded steel components to form an effective connection. This device mainly plays a role in energy dissipation and vibration reduction during the pier lifting stage after the sacrificial component 3 breaks, without affecting the pier's sway isolation, and can further ensure the safety of the pier during earthquakes.

[0052] The bridge pier and foundation are integrated by connecting an external sacrificial component 3 and a viscous damper energy dissipation device. During normal use, the pier remains in a non-lifted state, fully utilizing the mass of the superstructure, its own weight, and the vertical force provided by the sacrificial component 3 to balance wind loads, train braking forces, and minor earthquakes. When the ground vibration intensity is high, the sacrificial component 3 breaks, causing the pier to lift and sway, thus achieving a sway isolation effect. During the swaying process, the viscous damper energy dissipation device achieves the purpose of vibration reduction and energy dissipation. The above description is only a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A railway self-resetting bridge pier with an additional energy dissipation device at the pier base, characterized in that, It includes a pier (1), an enlarged foundation (2), and a pile foundation cap (5). The pier (1) and the enlarged foundation (2) are bonded together. A separation surface (6) is provided between the enlarged foundation (2) and the pile foundation cap (5). It also includes a liquid viscous damper (4), which is externally placed between the enlarged foundation (2) and the pile foundation cap (5).

2. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 1, characterized in that, Along the longitudinal direction of the bridge, the top two ends of the enlarged foundation (2) are provided with extended flanges (21), and the liquid viscosity damper (4) is disposed between the extended flanges (21) and the enlarged foundation (2).

3. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 2, characterized in that, The liquid viscosity damper (4) is connected to the extended flange (21) and the enlarged foundation (2) through a pre-embedded steel component (10); the pre-embedded steel component (10) includes a steel plate (101) and multiple reinforcing bars (102), and the multiple reinforcing bars (102) are bonded to the steel plate (101).

4. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 3, characterized in that, The liquid viscosity damper (4) and the embedded steel component (10) are welded together.

5. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 2, characterized in that, Two liquid viscosity dampers (4) are provided on each side of the extended flange (21) in the longitudinal direction. One is provided between the bottom surface of the extended flange (21) and the pile foundation cap (5), and the other is provided between the side surface of the extended flange (21) and the pile foundation cap (5).

6. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 5, characterized in that, Two liquid viscosity dampers (4) at the same apex position of the extended flange (21) are a group, and a total of four groups are provided on the enlarged base (2), with one group provided at each apex position of the extended flange (21).

7. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 2, characterized in that, One liquid viscous damper (4) is provided on each side of the extended flange (21) in the longitudinal direction. The liquid viscous damper (4) is located between the side of the extended flange (21) and the pile foundation cap (5); or, the liquid viscous damper (4) is located between the bottom surface of the extended flange (21) and the pile foundation cap (5).

8. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 7, characterized in that, One of the liquid viscosity dampers (4) is provided at each of the four apex positions of the extended flange (21).

9. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 2, characterized in that, The liquid viscous damper (4) is provided on each side of the extended flange (21) in the longitudinal direction. The liquid viscous damper (4) is provided between the side of the extended flange (21) and the pile foundation cap (5). It also includes a sacrificial component (3), which is provided between the bottom surface of the extended flange (21) and the pile foundation cap (5).

10. The railway self-resetting bridge pier with an additional energy dissipation device at the pier base according to claim 9, characterized in that, The upper end of the sacrificial component (3) extends from the bottom surface of the extended flange (21) to the top surface of the extended flange (21) and is connected by a nut (7). The lower end of the sacrificial component (3) is connected to a steel bar partially embedded in the pile foundation cap (5) by a bolt sleeve (9).

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