A prefabricated assembly type rocking bridge pier structure of self-resetting viscous damper

Abstract

The application relates to a prefabricated assembly type rocking bridge pier structure of a self-resetting viscous damper and belongs to the technical field of bridge engineering shock absorption and isolation. The structure comprises a prefabricated pier column, a prefabricated pile cap, a prefabricated pile cap, a limiting steel plate, a viscous damper and a friction plate; the friction plate is arranged between the prefabricated pile cap and the prefabricated pile cap, the limiting steel plate is arranged along the prefabricated pile cap, the viscous damper is arranged between the limiting steel plate and the prefabricated pile cap, and the viscous damper comprises an outer sliding sleeve, a piston rod, a sealing cover A, a magnet A, a piston, a cylinder wall, a sealing cover B, a magnet B, an upper end cover and a lower end cover. In an earthquake process, the whole structure system rocks, the seismic energy is dissipated through the self-resetting viscous damper, the bridge structure can be restored to the original position through the dead weight of the structure and the repulsive force of the magnet, and the damage of the bridge structure under the action of the earthquake can be effectively controlled; the application can realize full-prefabricated on-site assembly construction, effectively shorten the construction period, and realize an efficient, fast and green industrialized construction mode.

Description

TECHNICAL FIELD

[0001] The present application relates to a pier structure system, in particular to a prefabricated assembled rocking pier structure system with self-resetting viscous dampers, and belongs to the technical field of bridge engineering seismic mitigation. BACKGROUND

[0002] Earthquake disasters have the characteristics of suddenness, low predictability, and strong destructiveness, and can burst out a lot of energy in an instant, causing great damage to various buildings or structures, and the threat to people's life and property is also devastating, so the earthquake load is the most important control load in modern civil engineering. From ancient times to now, there have been many major earthquake disasters, causing great damage and casualties. With the rapid development of China's economy and the advancement of urbanization process, population and wealth are increasingly concentrated, and due to the improvement of structural seismic facilities and national earthquake relief policies and emergency systems, the number of earthquake casualties has decreased significantly, but the economic losses caused by earthquakes are still huge, especially the repair of buildings after the earthquake often requires a lot of cost. Based on this, the recoverable function structure is increasingly valued by researchers in the field of earthquake engineering and civil engineering, and the earthquake recoverable function structure refers to the structure that can recover its function without repair or with slight repair after an earthquake. Bridges, as extremely important lifeline hub projects, play a very important role in rescuing the wounded, rescuing materials and rebuilding the disaster area after the earthquake, but once the bridge is damaged by an earthquake, it is extremely difficult to repair. The damage and interruption of the traffic lifeline caused by the bridge damage prevent rescue personnel from arriving on time, and the indirect economic losses and casualties are incalculable.

[0003] For traditional bridge seismic design, the seismic resistance of the pier mainly adopts ductility seismic design and seismic isolation design. The ductility seismic design theory has defects, which only emphasizes the influence of structural ductility response amplitude on structural damage, but does not reveal the occurrence mechanism of engineering earthquake disasters. Similarly, the seismic isolation design also has many shortcomings, and the seismic isolation component is usually installed at the top of the pier, which is relatively expensive and difficult to install. When the bridge encounters a major earthquake, even if the pier can be prevented from collapsing, the residual deformation is often too large, and the post-earthquake repair and reinforcement is not only difficult but also requires a lot of resources; in addition, the current construction of urban bridges is still mainly based on site pouring, which has a long construction period and occupies a large site, causing serious traffic congestion around the bridge construction site.

[0004] The sway-self-resetting system is a novel system with promising application prospects. Under strong earthquakes, the structure sways, releasing the bending moment at structural nodes and avoiding the formation of plastic hinges. However, this structural system has extremely weak energy dissipation capacity, low structural strength and stiffness, and low load-bearing capacity. Current improvement methods only involve adding energy dissipation devices to the bottom of the piers, but the energy dissipation effect is not significant, and it also causes considerable damage to the pier nodes. The energy dissipation and reset effects are not obvious, and the post-earthquake repair pressure is also very high.

[0005] Based on the aforementioned problems, there is an urgent need for a new type of bridge pier structure system that can both fully dissipate energy and reduce vibration at the epicenter to reduce peak displacement, and can also self-reset after the earthquake to reduce residual displacement, so that it can be restored to its function without repair or with minimal repair. Summary of the Invention

[0006] Based on the aforementioned deficiencies of existing technologies, this invention proposes a prefabricated assembled rocking pier structure system with a self-resetting viscous damper to solve the problems of energy dissipation and self-resetting during earthquakes.

[0007] To solve the above problems, the present invention adopts the following technical solution:

[0008] A prefabricated assembled swing pier structure system with a self-resetting viscous damper includes a prefabricated pier column, a prefabricated bearing cap, a prefabricated support platform, a limiting steel plate, a viscous damper, and a friction plate.

[0009] The precast pier and the precast platform below it are cast together as a whole; only friction plates are provided between the precast platform and the precast bearing platform below it to increase friction, limit the sliding of the precast platform, and prevent the precast pier and the precast platform from misaligning and overturning; apart from the friction plates, there are no constraints between the precast bearing platform and the precast platform, and the contact surface between the two is a free surface to realize the swaying of the precast pier under a large earthquake.

[0010] The limiting steel plate is sleeved around the precast platform. The limiting steel plate includes a horizontal steel plate and an outer vertical steel plate. The outer vertical steel plate is connected to the embedded parts on the precast platform by bolts. The viscous damper is set between the limiting steel plate and the precast platform. Its upper end is in close contact with the horizontal steel plate, and its lower end is in close contact with the precast platform.

[0011] The viscous damper mainly includes: an outer sliding sleeve, a piston rod, a sealing cover A, a magnet A, a piston, a cylinder wall, a sealing cover B, a magnet B, an upper end cover, and a lower end cover;

[0012] The upper end cover and the downward-facing outer sliding sleeve constitute the upper outer shell of the damper, while the lower end cover and the upward-facing cylinder wall constitute the lower outer shell of the damper. The cylinder wall of the lower outer shell is fitted inside the outer sliding sleeve of the upper outer shell. A magnet A is installed inside the upper end cover, and a piston rod is installed below magnet A, with a piston mounted on the piston rod. A magnet B is installed inside the lower end cover, and a sealing cover B is installed above magnet B. A sealing cover A is installed on the top of the cylinder wall. Magnets A and B are placed with their magnetic poles facing each other, and the repulsive force they generate can reset the viscous damper and the swaying pier. The piston divides the lower outer shell of the damper into two chambers, both filled with compressible viscous liquid. A damping hole connecting the two chambers is provided at the outer end of the piston.

[0013] Furthermore, a sealing element is provided between the sealing cover A and the piston rod, and a sealing element is also provided between the piston and the cylinder wall to prevent viscous liquid from overflowing.

[0014] Furthermore, the structural system adopts single-column piers or single-column frames.

[0015] Furthermore, the viscous liquid is compressible silicone oil.

[0016] Furthermore, both magnet A and magnet B are neodymium iron boron magnets.

[0017] Furthermore, the shape and size of the friction pad are the same as the cross-section of the prefabricated platform.

[0018] Furthermore, the friction pad material is asbestos friction material, semi-metallic friction material, NAO friction material, powder metallurgy friction material, or carbon fiber friction material.

[0019] The working principle is as follows: Under the action of a major earthquake, the pier composed of precast columns and precast platforms begins to sway, and one end of the precast platform is lifted. Due to the restriction of the limiting steel plate, the cylinder wall and the outer sliding sleeve will move relative to each other, and the volume of the two chambers will change. This forces the viscous liquid to flow from the high-pressure chamber into the low-pressure chamber through the damping hole. The friction between the viscous liquid and the damping hole will dissipate the seismic energy, thereby reducing the damage to the structural system. Furthermore, as the distance between magnet A and magnet B shortens, the repulsive force between the same phase magnetic poles will increase, thereby realizing the reset of the viscous damper and the swaying pier.

[0020] The beneficial effects of this invention are as follows:

[0021] The prefabricated assembled rocking pier structure system of the self-resetting viscous damper of the present invention has significant vibration reduction and self-resetting effects under seismic loading, mainly reflected in the following aspects:

[0022] 1. Under seismic load, the bending moment at the end node of the bridge pier can be effectively released, reducing bridge pier damage and lowering the seismic force borne by the bridge structure. Furthermore, the seismic energy can be dissipated through viscous dampers and bridge pier swaying, effectively controlling the bridge pier's response during an earthquake.

[0023] 2. Under minor earthquakes, the bridge piers resist the seismic lift-off moment without swaying, relying on the weight of the pier columns, abutments, and the superstructure. They also withstand seismic forces through their own strength. In this case, the swaying pier is no different from a traditional pier. Under major earthquakes, the piers filter seismic energy through swaying, while simultaneously dissipating the energy transmitted to the piers through viscous dampers. Self-resetting viscous dampers can even provide additional restoring force through the repulsive force of like magnetic poles, effectively reducing residual displacement of the structure and achieving good post-earthquake recovery.

[0024] 3. All components of the prefabricated assembled swing pier structure system with self-resetting viscous damper can be prefabricated in the factory, and only need to be assembled on site, which effectively shortens the on-site construction period, reduces the impact on the surrounding environment of the construction site, and achieves efficient and green bridge construction.

[0025] 4. Post-earthquake damage is concentrated on the viscous dampers and limiting steel plates, which can be easily repaired or replaced for continued use, ensuring uninterrupted transportation lifelines. Therefore, this invention has good socio-economic benefits and is worthy of promotion and use. Attached Figure Description

[0026] Figure 1 This is a transverse schematic diagram of a prefabricated assembled rocking pier structure system with a self-resetting viscous damper according to the present invention.

[0027] Figure 2 This is a top view of a prefabricated assembled rocking pier structure system with a self-resetting viscous damper according to the present invention.

[0028] Figure 3 This is a schematic diagram of the viscous damper of the present invention;

[0029] Figure 4 This is a schematic diagram of a prefabricated swaying pier structure system with a self-resetting viscous damper according to the present invention.

[0030] Figure 5 This is a schematic diagram of the deformation of a self-resetting viscous damper of the present invention during system swaying. In the diagram, (a) is before deformation and (b) is after compression deformation. Detailed Implementation

[0031] Combined with appendix Figures 1-5 The embodiments of the present invention will be described in detail below.

[0032] First, it should be noted that the prefabricated assembled swing pier structure system with self-resetting viscous damper shown in the attached drawings is intended to illustrate the invention simply, clearly, and concisely. Therefore, the attached drawings should not be regarded as a limitation of the invention.

[0033] like Figures 1-2 As shown, the present invention discloses a prefabricated assembled swaying pier structure system with a self-resetting viscous damper, employing a single-column pier, including a prefabricated pier column 1, a prefabricated bearing platform 3, a prefabricated extension platform 2, a limiting steel plate 4, a viscous damper 5, and a friction plate 6. The prefabricated pier column 1 and the prefabricated extension platform 2 below it are integrally cast together. Only the friction plate 6 is provided between the prefabricated extension platform 2 and the prefabricated bearing platform 3 below it to increase friction, limit the sliding of the prefabricated extension platform 2, and prevent misalignment and overturning of the prefabricated pier column 1 and the prefabricated extension platform 2. Apart from the friction plate 6, there are no constraints between the prefabricated bearing platform 3 and the prefabricated extension platform 2; the contact surface between them is a free surface, enabling the swaying of the prefabricated pier column 1 under strong earthquakes. In this embodiment, the shape and size of the friction plate 6 are the same as the cross-section of the prefabricated extension platform 2, and the material of the friction plate 6 is specifically asbestos friction material. A limiting steel plate 4 is installed around the precast platform 2. The limiting steel plate 4 includes a horizontal steel plate 41 and an outer vertical steel plate 42. The outer vertical steel plate 42 is connected to the embedded parts on the precast platform 3 by bolts. A viscous damper 5 is installed between the limiting steel plate 4 and the precast platform 2. Its upper end is in close contact with the horizontal steel plate 41, and its lower end is in close contact with the precast platform 2.

[0034] like Figure 5 As shown, the viscous damper 5 mainly includes: an outer sliding sleeve 5-1, a piston rod 5-2, a sealing cover A5-3, a magnet A5-4, a piston 5-5, a cylinder wall 5-6, a sealing cover B5-7, a magnet B5-8, an upper end cover 5-10, and a lower end cover 5-12. The upper end cover 5-10 and the downward-facing outer sliding sleeve 5-1 constitute the upper outer shell of the damper, while the lower end cover 5-12 and the upward-facing cylinder wall 5-6 constitute the lower outer shell of the damper. The cylinder wall 5-6 of the lower outer shell is fitted inside the outer sliding sleeve 5-1 of the upper outer shell. A magnet A5-4 is installed inside the upper end cover 5-10, and a piston rod 5-2 is installed below the magnet A5-4. The piston 5-5 is mounted on the piston rod 5-2. A magnet B5-8 is installed inside the lower end cover 5-12, and a sealing cover B5-7 is installed above the magnet B5-8. A sealing cover A5-3 is installed on the top of the cylinder wall 5-6. Magnets A5-4 and B5-8 are placed with their magnetic poles facing each other, and the repulsive force they generate can reset the viscous damper 5 and the swaying pier. In this embodiment, both magnets A5-4 and B5-8 are neodymium iron boron magnets. Piston 5-5 divides the lower outer shell of the damper into two chambers, which are filled with compressible viscous liquid 5-9. In this embodiment, viscous liquid 5-9 is compressible silicone oil. A damping hole connecting the two chambers is provided at the outer end of piston 5-5.

[0035] In this embodiment, as Figure 3 As shown, a sealing element 5-11 is provided between the sealing cover A5-3 and the piston rod 5-2, and a sealing element 5-11 is also provided between the piston 5-5 and the cylinder wall 5-6 to prevent the viscous liquid 5-9 from overflowing.

[0036] like Figures 4-5 As shown, under a major earthquake, the pier consisting of precast column 1 and precast platform 2 begins to sway. One end of precast platform 2 lifts up, and due to the constraint of the limiting steel plate 4, the cylinder wall 5-6 and the outer sliding sleeve 5-1 move relative to each other. The volume of the two chambers changes, forcing the viscous liquid 5-9 to flow from the high-pressure chamber into the low-pressure chamber through the damping hole. The friction between the viscous liquid 5-9 and the damping hole dissipates the seismic energy, thereby reducing the damage to the structural system. Furthermore, as the distance between magnets A5-4 and B5-8 shortens, the repulsive force between the in-phase magnetic poles increases, thus restoring the viscous damper 5 and the swaying pier.

[0037] In summary, although embodiments of the present invention have been described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments without departing from the principles and spirit of the present invention.

Claims

1. A prefabricated assembled swing pier structure system with a self-resetting viscous damper, comprising prefabricated pier columns (1) and prefabricated pier caps (3), characterized in that: It also includes a prefabricated platform (2), a limiting steel plate (4), a viscous damper (5), and a friction plate (6); The precast pier (1) and the precast platform (2) below it are cast together as a whole; only friction plates (6) are provided between the precast platform (2) and the precast bearing platform (3) below it. The limiting steel plate (4) is sleeved around the precast platform (2). The limiting steel plate (4) includes a horizontal steel plate (41) and an outer vertical steel plate (42). The outer vertical steel plate (42) is connected to the embedded parts on the precast platform (3) by bolts. The viscous damper (5) is set between the limiting steel plate (4) and the precast platform (2). Its upper end is in close contact with the horizontal steel plate (41), and its lower end is in close contact with the precast platform (2). The structure of the viscous damper (5) includes: outer sliding sleeve (5-1), piston rod (5-2), sealing cover A (5-3), magnet A (5-4), piston (5-5), cylinder wall (5-6), sealing cover B (5-7), magnet B (5-8), upper end cover (5-10), and lower end cover (5-12). The upper end cover (5-10) and the downward-facing outer sliding sleeve (5-1) constitute the upper outer shell of the damper, while the lower end cover (5-12) and the upward-facing cylinder wall (5-6) constitute the lower outer shell of the damper. The cylinder wall (5-6) of the lower outer shell is fitted inside the outer sliding sleeve (5-1) of the upper outer shell. A magnet A (5-4) is installed inside the upper end cover (5-10), and a piston rod (5-2) is installed below the magnet A (5-4). A piston (5-5) is installed on the piston rod (5-2). A magnet B (5-8) is provided on the inner side of the upper and lower end caps (5-12), a sealing cap B (5-7) is provided on the upper side of the magnet B (5-8), and a sealing cap A (5-3) is provided on the top of the cylinder wall (5-6); the magnets A (5-4) and B (5-8) are placed with their magnetic poles facing each other; the piston (5-5) divides the lower outer shell of the damper into two chambers, which are filled with compressible viscous liquid (5-9); a damping hole connecting the two chambers is provided on the outer end of the piston (5-5).

2. The prefabricated assembled swing pier structure system with a self-resetting viscous damper according to claim 1, characterized in that: A sealing element (5-11) is provided between the sealing cover A (5-3) and the piston rod (5-2), and a sealing element (5-11) is also provided between the piston (5-5) and the cylinder wall (5-6) to prevent viscous liquid (5-9) from overflowing.

3. The prefabricated assembled swing pier structure system with a self-resetting viscous damper according to claim 1, characterized in that: The structural system adopts single-column piers or single-column frames.

4. The prefabricated assembled swing pier structure system with a self-resetting viscous damper according to claim 1, characterized in that: The viscous liquid (5-9) is compressible silicone oil.

5. The prefabricated assembled swing pier structure system with a self-resetting viscous damper according to claim 1, characterized in that: Both magnet A (5-4) and magnet B (5-8) are neodymium iron boron magnets.

6. The prefabricated assembled swing pier structure system with a self-resetting viscous damper according to claim 1, characterized in that: The shape and size of the friction plate (6) are the same as the cross-section of the prefabricated platform (2).

7. The prefabricated assembled rocking pier structure system with a self-resetting viscous damper according to claim 6, characterized in that: The friction plate (6) is made of asbestos friction material, semi-metallic friction material, NAO friction material, powder metallurgy friction material or carbon fiber friction material.

8. The prefabricated assembled swing pier structure system with a self-resetting viscous damper according to claim 1, characterized in that: When a major earthquake occurs, the pier consisting of the precast column (1) and the precast platform (2) begins to sway. One end of the precast platform (2) is lifted. Due to the restriction of the limiting steel plate (4), the cylinder wall (5-6) and the outer sliding sleeve (5-1) move relative to each other. The volume of the two chambers changes, forcing the viscous liquid (5-9) to flow from the high-pressure chamber into the low-pressure chamber through the damping hole. The friction between the viscous liquid (5-9) and the damping hole will dissipate the earthquake energy, thereby reducing the damage to the structural system. Furthermore, as the distance between magnet A (5-4) and magnet B (5-8) shortens, the repulsive force between the same phase magnetic poles will become greater and greater, thereby realizing the reset of the viscous damper (5) and the swaying pier.

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