Swing structure and energy consumption connecting device of prefabricated segment pier with self-resetting function

Abstract

The invention discloses a swing structure and energy consumption connecting device of a prefabricated segment pier with a self-resetting function, comprising: a base body, the top of which is provided with a swing interface; the at least one prefabricated pier body section is arranged on the base body, and the bottom of the prefabricated pier body section is provided with a contact surface matched with the swinging interface, so that the prefabricated pier body section ascends, descends and swings relative to the base body; the at least one prestressed tendon penetrates through the prefabricated pier body section and the base body, one end of the prestressed tendon is anchored to the top or the bottom, away from the base body, of the prefabricated pier body section, and the other end of the prestressed tendon is anchored in the base body; under the action of an earthquake, the prefabricated pier body section swings around the swing interface and is lifted, and the prestressed tendons elastically extend and store energy; and after the earthquake action is finished, the prestressed tendons are elastically reset to drive the prefabricated pier body section to return to the initial position. The problems that a traditional pier is large in post-earthquake residual displacement and difficult to repair can be solved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a swing structure and energy-dissipating connection device for a precast segmental bridge pier with self-resetting function. Background Technology

[0002] Traditional bridge piers are mostly constructed using cast-in-place reinforced concrete. Their seismic design primarily relies on the formation of plastic hinges to dissipate seismic energy, resulting in large residual deformations after an earthquake and making damage difficult to detect and repair.

[0003] Nowadays, prefabricated assembled bridge piers are mostly used to replace the traditional cast-in-place reinforced concrete construction method. Although this can improve construction efficiency, the seismic performance of the joint connections, especially the energy dissipation capacity and self-resetting capacity, is often a weak point.

[0004] Therefore, it is urgent to research and develop a swaying structure and energy-dissipating connection device for prefabricated segmental bridge piers with self-resetting function, which can not only realize the rapid assembly construction of bridge piers, but also ensure the rapid recovery of the structural function of bridge piers after earthquakes, thus solving the above-mentioned technical defects. Summary of the Invention

[0005] The purpose of this invention is to provide a swing structure and energy-dissipating connection device for prefabricated segmental bridge piers with self-resetting function, which can solve the problems of large residual displacement and difficult repair of traditional bridge piers after earthquakes.

[0006] To achieve the above objectives, the present invention provides a swaying structure for a precast segmental bridge pier with self-resetting function, the specific implementation of which is as follows: A rocking structure for a precast segmental bridge pier with self-resetting function includes: The base has a swing interface on top; At least one precast pier segment is provided on the base, and the bottom is provided with a contact surface that matches the swing interface, so that the precast pier segment can rise, fall and swing relative to the base. At least one prestressing tendon is provided, which runs through the precast pier section and the base. One end of the prestressing tendon is anchored to the top or bottom of the precast pier section away from the base, and the other end is anchored to the base. Under earthquake action, the precast pier segment sways and rises around the swaying interface, and the prestressed tendons elastically elongate and store energy; after the earthquake action ends, the prestressed tendons elastically reset, causing the precast pier segment to return to its initial position.

[0007] The present invention discloses a swaying structure for a precast segmental bridge pier with self-resetting function. Compared with the prior art, by setting a swaying interface and prestressing tendons on the base, the precast pier segment is allowed to lift and sway during an earthquake. The elastic deformation of the prestressing tendons stores energy, and the pier automatically resets after the earthquake through the restoring force of the prestressing tendons. This effectively solves the core problems of large residual displacement and difficult repair of traditional bridge piers after an earthquake in the prior art, and realizes the self-resetting function of the bridge and the ability to quickly restore traffic.

[0008] In some embodiments, the rocking interface is a smooth spherical or cylindrical support protruding from the top of the base, and the contact surface is a groove at the bottom of the precast pier section that matches the smooth spherical or cylindrical support. By using smooth spherical or cylindrical bearing platforms as the swaying interface, a precise fit is formed with the groove at the bottom of the precast pier section, ensuring the smoothness and stability of the swaying motion, reducing local stress concentration, and improving the durability and seismic reliability of the structure.

[0009] In some embodiments, at least two precast pier segments are provided, and the top of the precast pier segment is provided with a stacked platform that matches the groove. The shape of the stacked platform is the same as the smooth spherical platform or cylindrical platform on the top of the base.

[0010] By setting up multi-layered precast pier sections and stacking a foundation with the same shape as the base foundation on top, a continuous swaying system is formed, which enables the entire pier to participate in swaying motion in a coordinated manner, thereby improving the overall integrity and seismic performance of the structure.

[0011] In some embodiments, the contact surfaces between adjacent precast pier segments are provided with low-friction pads.

[0012] By setting low-friction pads between adjacent precast pier segments, the friction between segments is effectively reduced, allowing the restoring force of the prestressing tendons to be used more effectively to drive the structure to reset, thereby improving the self-resetting efficiency and reducing energy loss.

[0013] In some embodiments, the prestressing tendon is a high-strength steel strand, which is covered with a plastic sheath and filled with an anti-corrosion grease layer.

[0014] By using high-strength steel strands with plastic sheaths to form an unbonded prestressed tendon structure, it is ensured that the prestressed tendons can stretch freely during earthquakes, giving full play to their elastic recovery capabilities. At the same time, the anti-corrosion grease layer and plastic sheath provide good anti-corrosion protection and extend service life.

[0015] The present invention provides an energy-consuming connection device, the specific implementation of which is as follows: An energy-dissipating connection device, used in the aforementioned swaying structure of a precast segmental pier with self-resetting function, comprises: The energy-consuming body dissipates energy through its own plastic deformation; The first connecting part is located at either end of the energy-consuming body and is detachably connected to the base. The second connecting part is located at the other end of the energy-consuming body and is detachably connected to the precast pier section. When the precast pier section is lifted and swayed relative to the base, a relative displacement occurs between the first connecting part and the second connecting part, driving the energy-consuming body to undergo plastic deformation.

[0016] By setting up an independent energy dissipation connection device, the energy dissipation function is separated from the main structure. Quick replacement is achieved through detachable connection. At the same time, it is clarified that when the precast pier section is lifted and swayed relative to the base, the relative displacement between the first connection part and the second connection part is generated, which drives the energy dissipation body to undergo plastic deformation, ensuring the high efficiency of the two working together.

[0017] In some embodiments, the first connecting part is a first connecting plate, the second connecting part is a second connecting plate, and both the first connecting plate and the second connecting plate have a plurality of bolt holes; high-strength bolts are provided in the bolt holes, the high-strength bolts on the first connecting plate are connected to the first fixing plate fixed on the base, and the high-strength bolts on the second connecting plate are connected to the second fixing plate fixed on the precast pier section.

[0018] By using connecting plates and high-strength bolts to connect the energy-consuming body to the base and precast pier sections, reliable connection strength and convenient disassembly and assembly performance are provided, making the replacement of energy-consuming devices simple and quick, and greatly shortening the post-earthquake repair time.

[0019] In some embodiments, the energy-consuming body is a bending yielding type energy-consuming angle steel or a shear yielding type energy-consuming steel plate.

[0020] By offering two types of energy-dissipating steel—bending yield type and shear yield type—it provides flexibility for different engineering needs, allowing for the selection of the appropriate energy dissipation method based on specific seismic requirements.

[0021] In some embodiments, the flange of the energy-dissipating angle steel has stress concentration weakening holes or elongated holes; and / or the energy-dissipating steel plate is an E-shaped steel plate.

[0022] By setting stress concentration weakening holes or elongated holes on the energy-dissipating angle steel, and by adopting E-type or X-type designs on the energy-dissipating steel plate, the location of plastic deformation is effectively guided, the energy dissipation efficiency is improved, and the stability of energy dissipation performance is ensured.

[0023] Based on the above technical solution, the swaying structure and energy-dissipating connection device of the precast segmental bridge pier with self-resetting function of the present invention has the following advantages compared with the prior art: By combining a swaying structure, prestressed tendons, and replaceable energy dissipation devices, the goal of "earthquake resistance, self-resetting, and rapid repair" is achieved. First, the elastic restoring force of the prestressed tendons fundamentally solves the problem of large residual displacement in traditional bridge piers after earthquakes. Second, the replaceable energy dissipation devices guide structural damage to easily replaceable components, achieving both protection and rapid functional recovery of the main structure. The structure between the swaying interface and the contact surface provides a rotation center, the prestressed tendons provide restoring force, and the energy dissipation devices provide additional damping, forming an efficient energy management and dissipation mechanism. This elevates the concept of bridge earthquake resistance from the traditional "prevention of collapse" to a new level of "functional recovery," while also taking into account the construction advantages of prefabrication and assembly technology, providing reliable technical support for modern bridge construction. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the swing structure of the present invention; Figure 2 For the present invention Figure 1 A cross-sectional schematic diagram; Figure 3 This is a cross-sectional schematic diagram of the prestressed tendons of the present invention; Figure 4 This is a schematic diagram of the structure of the energy-consuming device and the swing structure of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the energy-consuming device and the swing structure of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the energy-dissipating body of the present invention, which is a bending yielding type energy-dissipating angle steel. Figure 1 ; Figure 7 This is a schematic diagram of the energy-dissipating body of the present invention, which is a bending yielding type energy-dissipating angle steel. Figure 2 ; Figure 8 This is a schematic diagram of the structure of the energy-consuming body of the present invention, which is a shear-yielding type energy-consuming steel plate.

[0025] Explanation of reference numerals in the attached figures: 100. Matrix; 110. Smooth spherical foundation; 120. Cylindrical foundation; 130. First fixing plate; 200. Precast pier segment; 210. Groove; 220. Stacked foundation; 240. Second fixing plate; 300. Prestressed tendon; 310. Plastic sheath; 320. Anti-corrosion grease layer; 400. Energy-consuming body; 410. First connecting part; 420. Second connecting part; 430. High-strength bolt; 440. Stress concentration weakening hole; 450. Oblong hole. Detailed Implementation

[0026] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0027] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0028] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0029] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0030] Example 1: like Figure 1-3 As shown in the figure, the swaying structure of a precast segmental bridge pier with self-resetting function provided in this embodiment includes: The base 100 has a swing interface on the top; At least one precast pier segment 200 is provided on the base 100, and the bottom is provided with a contact surface that matches the swing interface, so that the precast pier segment 200 can rise, fall and swing relative to the base 100. At least one prestressing tendon 300 is provided, which runs through the precast pier section 200 and the base 100. One end of the prestressing tendon 300 is anchored to the top or bottom of the precast pier section 200 away from the base 100, and the other end is anchored inside the base 100. Under the action of an earthquake, the precast pier segment 200 sways and rises around the swaying interface, and the prestressed tendons 300 elastically elongate and store energy; after the earthquake ends, the prestressed tendons 300 elastically reset, causing the precast pier segment 200 to return to its initial position.

[0031] In some embodiments, the rocking interface is a smooth spherical support 110 or a cylindrical support 120 protruding from the top of the base 100, and the contact surface is a groove 210 provided at the bottom of the precast pier section 200 that matches the smooth spherical support 110 or the cylindrical support 120. By using a smooth spherical pier cap 110 or a cylindrical pier cap 120 as the swing interface, a precise fit is formed with the groove 210 at the bottom of the precast pier section 200, ensuring the smoothness and stability of the swing motion, reducing local stress concentration, and improving the durability and seismic reliability of the structure.

[0032] In some embodiments, at least two precast pier segments 200 are provided, and the top of the precast pier segment 200 is provided with a stacked platform 220 that matches the groove 210. The shape of the stacked platform 220 is the same as that of the smooth spherical platform 110 or cylindrical platform 120 on the top of the base 100.

[0033] By setting up multi-layer precast pier sections 200 and setting up a stacked pier platform 220 with the same shape as the foundation 100 pier platform at the top, a continuous swaying system is formed, which enables the entire pier to participate in the swaying motion in a coordinated manner, thereby improving the overall integrity and seismic performance of the structure.

[0034] In some embodiments, the contact surfaces between adjacent precast pier sections 200 are provided with low-friction pads.

[0035] By setting low-friction pads between adjacent precast pier segments 200, the friction between segments is effectively reduced, allowing the restoring force of the prestressed tendons 300 to be used more effectively to drive the structure to reset, thereby improving the self-resetting efficiency and reducing energy loss.

[0036] In some embodiments, the prestressing tendon 300 is a high-strength steel strand, which is covered with a plastic sheath 310 and filled with an anti-corrosion grease layer 320.

[0037] By using high-strength steel strands with a plastic sheath 310 to form an unbonded prestressed tendon 300 structure, it is ensured that the prestressed tendon 300 can stretch freely during an earthquake, giving full play to its elastic recovery ability. At the same time, the anti-corrosion grease layer 320 and the plastic sheath 310 provide good anti-corrosion protection and extend the service life.

[0038] This embodiment, by setting a swaying interface and prestressed tendons 300 on the base 100, allows the precast pier section 200 to lift and sway during an earthquake. It utilizes the elastic deformation of the prestressed tendons 300 to store energy, and automatically resets after the earthquake through the restoring force of the prestressed tendons 300. This effectively solves the core problem of large residual displacement and difficult repair of traditional bridge piers after an earthquake in the background technology, and realizes the self-resetting function of the bridge and the ability to quickly restore traffic.

[0039] It is worth noting that the swaying interface design in this embodiment not only provides a center of rotation, but more importantly, through the geometric constraints of the convex-concave fit, it provides a clear motion trajectory for the entire swaying structure. In actual earthquakes, this design can effectively control the range of motion of the pier body and prevent excessive lateral displacement. The arrangement of the prestressing tendons 300 is carefully designed, and the selection of their anchorage positions fully considers the principle of moment balance, ensuring that the prestressing tendons 300 can be uniformly stressed under seismic action, avoiding excessive local stress. In addition, the precast pier section 200 in this embodiment is prefabricated in a factory, which can ensure the accuracy of concrete strength and geometric dimensions, providing quality assurance for the stable operation of the swaying structure.

[0040] Example 2: like Figure 3-8 As shown, the energy-dissipating connection device provided in this embodiment is used in the swaying structure of the precast segmental pier with self-resetting function described in Embodiment 1, and includes: The energy-consuming body is 400, and it dissipates energy through its own plastic deformation. The first connecting part 410 is provided at either end of the energy-consuming body 400 and is detachably connected to the base 100; The second connecting part 420 is located at the other end of the energy-consuming body 400 and is detachably connected to the precast pier section 200. When the precast pier section 200 is lifted and swayed relative to the base 100, a relative displacement occurs between the first connecting part 410 and the second connecting part 420, driving the energy-consuming body 400 to undergo plastic deformation.

[0041] By setting up an independent energy dissipation connection device, the energy dissipation function is separated from the main structure. Quick replacement is achieved through detachable connection. At the same time, it is clarified that when the precast pier section 200 is lifted and swayed relative to the base 100, the first connection part 410 and the second connection part 420 generate relative displacement, driving the energy dissipation body 400 to undergo plastic deformation, thus ensuring the high efficiency of the two working together.

[0042] In some embodiments, the first connecting part 410 is a first connecting plate, and the second connecting part 420 is a second connecting plate. Both the first connecting plate and the second connecting plate have a plurality of bolt holes. High-strength bolts 430 are provided in the bolt holes. The high-strength bolts 430 on the first connecting plate are connected to the first fixing plate 130 fixed on the base 100, and the high-strength bolts 430 on the second connecting plate are connected to the second fixing plate 240 fixed on the precast pier section 200.

[0043] The connection between the energy-consuming body 400 and the base 100 and the precast pier section 200 is achieved by using a connecting plate and high-strength bolts 430. This provides reliable connection strength and convenient disassembly and assembly performance, making the replacement of the energy-consuming device simple and quick, and greatly shortening the post-earthquake repair time.

[0044] In some embodiments, the energy-consuming body 400 is a bending yielding type energy-consuming angle steel or a shear yielding type energy-consuming steel plate.

[0045] By offering two types of energy-dissipating steel—bending yield type and shear yield type—it provides flexibility for different engineering needs, allowing for the selection of the appropriate energy dissipation method based on specific seismic requirements.

[0046] In some embodiments, the flange of the energy-dissipating angle steel has stress concentration weakening holes 440 or oblong holes 450; and / or the energy-dissipating steel plate is an E-shaped steel plate.

[0047] By setting stress concentration weakening holes 440 or elongated holes 450 on the energy-dissipating angle steel, and by adopting E-type or X-type designs on the energy-dissipating steel plate, the location of plastic deformation is effectively guided, the energy dissipation efficiency is improved, and the stability of energy dissipation performance is ensured.

[0048] The energy-dissipating connection device in this embodiment is designed with full consideration of the collaborative working mechanism with the swaying structure. When the precast pier section 200 is lifted relative to the base 100, the relative displacement between the first connection part 410 and the second connection part 420 is three-dimensional, including both vertical and horizontal components. This complex relative motion can more effectively drive the energy-dissipating body 400 to undergo plastic deformation. The elongated holes 450 provided on the energy-dissipating angle steel not only serve as stress concentration points, but more importantly, they provide the necessary deformation space for the device, avoiding initial stress caused by manufacturing errors or temperature changes. In practical applications, the number and location of the energy-dissipating connection devices can be optimized according to specific seismic requirements, such as symmetrically arranging them around the pier body to ensure the torsional performance of the structure. In addition, the selection of energy-dissipating materials has also undergone rigorous calculation and analysis to ensure that their yield strength matches the tension of the prestressed tendons 300, thereby achieving the optimal energy dissipation effect. However, the calculation method is not within the scope of protection of this embodiment and will not be described in detail here.

[0049] This invention provides a swing structure and energy-dissipating connection device for prefabricated segmental bridge piers with self-resetting function. Compared with existing technologies, it achieves the goal of "earthquake resistance, self-resetting, and rapid repair" through the combination of the swing structure, prestressed tendons 300, and replaceable energy-dissipating devices. Firstly, the elastic restoring force of the prestressed tendons 300 fundamentally solves the problem of large residual displacement of traditional bridge piers after earthquakes. Secondly, the replaceable energy-dissipating device guides structural damage to easily replaceable components, achieving protection of the main structure and rapid functional recovery. The structure between the swing interface and the contact surface provides a rotation center, the prestressed tendons 300 provide restoring force, and the energy-dissipating device provides additional damping, forming an efficient energy management and dissipation mechanism. This elevates the concept of bridge earthquake resistance from the traditional "prevention of collapse" to a new level of "functional recovery," while also taking into account the construction advantages of prefabrication and assembly technology, providing reliable technical support for modern bridge construction.

[0050] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A swing structure for a precast segmental bridge pier with self-resetting function, characterized in that, include: The base (100) has a swing interface on top; At least one precast pier segment (200) is provided on the base (100), and the bottom is provided with a contact surface that matches the swing interface, so that the precast pier segment (200) can rise and swing relative to the base (100); At least one prestressing tendon (300) is provided, which runs through the precast pier section (200) and the base (100). One end of the prestressing tendon (300) is anchored to the top or bottom of the precast pier section (200) away from the base (100), and the other end is anchored in the base (100). Under the action of an earthquake, the precast pier segment (200) swings and rises around the swing interface, and the prestressed tendons (300) elastically elongate and store energy; after the earthquake ends, the prestressed tendons (300) elastically reset, causing the precast pier segment (200) to return to its initial position.

2. The swaying structure of the precast segmental bridge pier with self-resetting function as described in claim 1, characterized in that, The swing interface is a smooth spherical platform (110) or a cylindrical platform (120) protruding from the top of the base (100), and the contact surface is a groove (210) provided at the bottom of the precast pier section (200) that matches the smooth spherical platform (110) or the cylindrical platform (120).

3. The swaying structure of the precast segmental bridge pier with self-resetting function as described in claim 2, characterized in that, At least two precast pier sections (200) are provided. The top of the precast pier section (200) is provided with a stacked platform (220) that matches the groove (210). The shape of the stacked platform (220) is the same as the smooth spherical platform (110) or cylindrical platform (120) on the top of the base (100).

4. The swaying structure of the precast segmental bridge pier with self-resetting function as described in claim 3, characterized in that, The contact surfaces between adjacent precast pier sections (200) are provided with low-friction pads.

5. The swaying structure of the precast segmental bridge pier with self-resetting function as described in any one of claims 1-4, characterized in that, The prestressed tendon (300) is a high-strength steel strand, which is covered with a plastic sheath (310) and filled with an anti-corrosion grease layer (320).

6. An energy-dissipating connection device, used in the swaying structure of a precast segmental bridge pier with self-resetting function as described in any one of claims 1-5, characterized in that, include: The energy-consuming body (400) dissipates energy through its own plastic deformation; The first connecting part (410) is provided at either end of the energy-consuming body (400) and is detachably connected to the base (100); The second connecting part (420) is located at the other end of the energy-consuming body (400) and is detachably connected to the precast pier section (200); When the precast pier section (200) is lifted and swayed relative to the base (100), a relative displacement is generated between the first connecting part (410) and the second connecting part (420), driving the energy-consuming body (400) to undergo plastic deformation.

7. The energy-consuming connection device as described in claim 6, characterized in that, The first connecting part (410) is a first connecting plate, and the second connecting part (420) is a second connecting plate. Both the first connecting plate and the second connecting plate have a plurality of bolt holes. High-strength bolts (430) are provided in the bolt holes. The high-strength bolts (430) on the first connecting plate are connected to the first fixing plate (130) fixed on the base (100), and the high-strength bolts (430) on the second connecting plate are connected to the second fixing plate (240) fixed on the precast pier section (200).

8. The energy-consuming connection device as described in claim 6, characterized in that, The energy-consuming body (400) is a bending yielding type energy-consuming angle steel or a shear yielding type energy-consuming steel plate.

9. The energy-consuming connection device as described in claim 8, characterized in that, The energy-dissipating angle steel has stress concentration weakening holes (440) or elongated holes (450) on its flange; and / or the energy-dissipating steel plate is an E-type steel plate.

Images