Fabricated energy dissipation and shock absorption self-resetting pier system and assembling method thereof

Abstract

The invention relates to an assembly type energy dissipation and seismic mitigation self-resetting pier system and an assembly method thereof.The assembly type energy dissipation and seismic mitigation self-resetting pier system comprises a bearing platform fixed to a pile foundation, and a vertically-through seismic mitigation channel is formed in the bearing platform; the pier body is fixed to the bearing platform, a vertically-through damping channel is formed in the pier body, and a plastic hinge area is arranged on the lower portion of the pier body; the double-effect self-resetting energy dissipation and shock absorption device comprises a shock absorption rod, a shock absorption channel in the pier body is aligned and communicated with a shock absorption channel in the bearing platform in an assembled state, and the shock absorption rod is arranged in the shock absorption channel in a penetrating mode to connect the pier body with the bearing platform in an assembled mode so as to conduct energy dissipation, shock absorption and self-resetting under the action of an earthquake; and the folding type mild steel energy dissipation and shock absorption damper is installed in the plastic hinge area of the pier body so as to carry out energy dissipation and shock absorption under the action of an earthquake. According to the method, damage to the pier system in natural disasters such as earthquakes can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and relates to the combined shock absorption technology of segmental assembled self-centering piers, and particularly relates to an assembled energy-dissipating shock-absorbing self-centering pier system and an assembling method thereof. Background Art

[0002] As the throat of engineering projects, bridges are important channels connecting the economy and culture of two places. The high-quality development of bridge technology will create a broader path for social development and also bring greater potential economic value. Therefore, introducing prefabricated connection technology to assist the high-quality development of bridges has important practical engineering significance.

[0003] At present, there are many related researches and engineering applications on the segmental assembly technology of the upper structure of bridges, but there are few researches and engineering applications on the segmental assembly technology of the lower structure of bridges. In recent years, the engineering community in China has gradually carried out research on the prefabricated system of pier systems. Countries such as Europe and the United States started researching and applying the segmental assembled pier system earlier. Since the 1960s, a large number of engineering applications of prefabricated lower structures have been carried out. At present, this technology is mainly applied in low-intensity areas. The main reason restricting the application of prefabricated technology in medium- and high-intensity areas is the unclear seismic performance.

[0004] Due to the unclear seismic performance of the connection technology of the prefabricated pier system itself and the weak force at the joint, the application and popularization of this technology are restricted. For the field of municipal bridges, vehicles put forward higher requirements for the stability of the main girder. Therefore, it is crucial for municipal bridges that the pier system has sufficient stiffness. At present, the application of the connection technology of the prefabricated pier system in the municipal field is still less, and it is necessary to further study the performance improvement of the prefabricated connection technology of the municipal pier system. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides an assembled energy-dissipating shock-absorbing self-centering pier system and an assembling method thereof. The present invention mainly solves the problems of poor anti-interference ability, unclear seismic performance, and weak force at the joint in the splicing technology of the lower structure of bridges in the prior art.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention provides an assembled energy-dissipating shock-absorbing self-centering pier system, which includes:

[0008] A bearing platform, fixed on a pile foundation, and a vertically penetrating shock-absorbing channel is provided in the bearing platform;

[0009] A pier body, fixed on the bearing platform, a vertically penetrating shock-absorbing channel is provided in the pier body, and a plastic hinge area is provided at the lower part of the pier body;

[0010] Dual-effect self-resetting energy dissipation shock absorption device, including a shock absorption rod. In the assembled state, the shock absorption channel in the pier body is aligned and communicated with the shock absorption channel in the bearing platform. The shock absorption rod is configured to penetrate through the shock absorption channel to assemble and connect the pier body and the bearing platform, so as to perform energy dissipation shock absorption and self-resetting under earthquake action;

[0011] Folding type mild steel energy dissipation shock absorption damper, installed in the plastic hinge area of the pier body to perform energy dissipation shock absorption under earthquake action.

[0012] The present invention combines a built-in dual-effect self-resetting energy dissipation shock absorption device and an external folding type mild steel energy dissipation shock absorption damper for dual-effect earthquake resistance, forming an internal and external combined shock absorption. It can not only reduce the damage suffered by the pier system during an earthquake, but also enable the automatic reset of the pier system after vibration, initially solve the pain points of the application of prefabrication technology in the field of municipal bridges, reduce the application risk of prefabrication technology, and contribute to the safe, green and healthy development of municipal bridge technology.

[0013] Preferably, external threads are provided at both the upper end and the lower end of the shock absorption rod. A fixing groove is opened at the bottom of the bearing platform, and the fixing groove is communicated with the shock absorption channel. The lower end of the shock absorption rod is connected and fixed in the fixing groove through a fixing connection nut;

[0014] An anchoring groove is provided at the upper end of the pier body, and the anchoring groove is communicated with the shock absorption channel. The upper end of the shock absorption rod is anchored and fixed in the anchoring groove through an anchoring connection nut.

[0015] Preferably, the dual-effect self-resetting energy dissipation shock absorption device further includes disc spring plates;

[0016] The disc spring plates are installed at the lower end of the external thread at the upper end of the shock absorption rod. The disc spring plates are arranged in the anchoring groove, and the length of the anchoring groove is greater than or equal to the length of the disc spring plates in the normal state.

[0017] Preferably, plastic hinge area transition zones are provided both above and below the plastic hinge area;

[0018] The width of the plastic hinge area is smaller than the width of the pier body, and the width of the plastic hinge area transition zone gradually shrinks from top and bottom to the plastic hinge area.

[0019] Preferably, the folding type mild steel energy dissipation shock absorption damper includes installation end plates and folding type mild steel steel boots;

[0020] The installation end plates are provided at both ends of the folding type mild steel steel boots, and a plurality of creases are provided on the folding type mild steel steel boots. Under earthquake action, the folding type mild steel steel boots can be folded along the creases.

[0021] Preferably, the pier body includes a pier head and a pier bottom;

[0022] The lower end of the pier head is provided with an extended pier head steel bar, the upper end of the pier bottom is reserved with a pier bottom corrugated pipe adapted to the pier head steel bar, the middle part of the pier bottom is provided with the plastic hinge area, the lower end of the pier bottom is provided with an extended pier bottom steel bar, and the upper end of the bearing platform is reserved with a bearing platform corrugated pipe adapted to the pier bottom steel bar.

[0023] Preferably, the lower end of the pier bottom is provided with a corrugated pier bottom joint, and the upper end of the bearing platform is provided with a bearing platform connection groove adapted to the pier bottom joint.

[0024] The present invention also provides an assembly method for the above-mentioned assembled energy-dissipating and shock-absorbing self-resetting pier system, which includes the following steps:

[0025] Pre-prepare the pier body, the double-effect self-resetting energy-dissipating and shock-absorbing device and the folded mild steel energy-dissipating and shock-absorbing damper and transport them to the installation site;

[0026] After building the bearing platform, install the shock-absorbing rod in the double-effect self-resetting energy-dissipating and shock-absorbing device into the shock-absorbing channel on the bearing platform. Then, after aligning the shock-absorbing channel in the pier body with the shock-absorbing rod, install the pier body on the bearing platform and grout;

[0027] After the grouting is completed, install the folded mild steel energy-dissipating and shock-absorbing damper on the plastic hinge area on the pier body, and the installation is completed.

[0028] Preferably, installing the pier body on the bearing platform and grouting includes the following steps:

[0029] First, align the pier bottom steel bar at the lower end of the pier bottom with the bearing platform corrugated pipe on the bearing platform. At this time, the shock-absorbing rod passes through the shock-absorbing channel on the pier bottom, slowly lower the pier bottom until the pier bottom steel bar extends into the bearing platform corrugated pipe, then grout into the bearing platform corrugated pipe, and then slowly lower the pier bottom again to completely place the pier bottom into the bearing platform connection groove on the bearing platform;

[0030] Then align the pier head steel bar of the pier head with the pier bottom corrugated pipe on the pier bottom, slowly lower the pier head until the pier head steel bar extends into the pier bottom corrugated pipe, then grout into the pier bottom corrugated pipe, and then slowly lower the pier head again until the pier head is flush with the pier bottom.

[0031] Preferably, after the pier head is flush with the pier bottom, the following steps are further included:

[0032] Sheathe the disc spring on the external thread at the upper end of the shock-absorbing rod, and at the same time tighten the anchoring connection nut at the upper end of the shock-absorbing rod, and the installation is completed.

[0033] The beneficial effects of the present invention compared with the prior art are:

[0034] 1. The self-centering pier system proposed by the present invention uses a dual-effect self-centering energy-dissipating shock absorber and a folded mild-steel energy-dissipating shock damper in combination for dual-effect shock absorption, achieving complementary functions and working together to achieve the purpose of combined shock absorption. Moreover, it also improves the anti-interference ability and seismic safety of the assembled track pier system.

[0035] 2. The present invention uses the plastic hinge area as the activation control switch of the self-centering pier system with combined dual-effect shock absorption, achieving the purpose of predictable occurrence of pier system damage. Therefore, it can skillfully utilize the functions of the devices and distribution devices to achieve the ductile seismic design of the pier system.

[0036] 3. The present invention adopts a combined connection method of grouting type and socket type to achieve stable connection between the pier head and the pier bottom, and between the pier bottom and the bearing platform. A corrugated structure connection is adopted at the pier bottom, enabling the stable performance of various functions of the pier system.

[0037] It should be understood that the implementation of any embodiment of the present invention does not mean that multiple or all of the above beneficial effects need to be simultaneously achieved or reached. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0039] The structures, proportions, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have technical substantive significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0040] Figure 1 The front view of the self-centering pier system provided by the embodiment of the present invention;

[0041] Figure 2 The front view of the dual-effect self-centering energy-dissipating shock absorber provided by the embodiment of the present invention;

[0042] Figure 3 The front view of the shock absorber rod provided by the embodiment of the present invention;

[0043] Figure 4 The stacked combination form of the disc spring pieces provided by the embodiment of the present invention;

[0044] Figure 5 The mating combination form of the disc spring provided by the embodiment of the present invention;

[0045] Figure 6 The front view of the pier head provided by the embodiment of the present invention;

[0046] Figure 7 The front view of the pier bottom provided by the embodiment of the present invention;

[0047] Figure 8 The top view of the pier bottom provided by the embodiment of the present invention;

[0048] Figure 9 The top view of the bearing platform provided by the embodiment of the present invention;

[0049] Figure 10 The front view of the folding type mild steel energy dissipation shock absorber provided by the embodiment of the present invention;

[0050] Figure 11 The front view of the bearing platform provided by the embodiment of the present invention;

[0051] Figure 12 The front view during earthquake of the self - resetting bridge pier system provided by the embodiment of the present invention;

[0052] Figure 13 The side view during earthquake of the self - resetting bridge pier system provided by the embodiment of the present invention;

[0053] Figure 14 The installation schematic diagram of the self - resetting bridge pier system provided by the embodiment of the present invention.

[0054] Markings in the figure:

[0055] 1 - Double - effect self - resetting energy dissipation shock absorber; 11 - Disc spring; 12 - Shock absorption rod; 13 - External thread; 14 - Anchoring connection nut; 15 - Fixed connection nut; 2 - Pier head; 21 - Pier head steel bar; 22 - Anchoring groove; 23 - Shock absorption channel; 3 - Pier bottom; 31 - Pier bottom corrugated pipe; 32 - Upper end of pier bottom; 33 - Lower end of pier bottom; 34 - Plastic hinge area transition zone; 35 - Plastic hinge area; 36 - Pier bottom joint; 37 - Pier bottom steel bar; 4 - Folding type mild steel energy dissipation shock absorber; 41 - Installation end plate; 42 - Folding type mild steel steel boot; 5 - Bearing platform; 51 - Bearing platform connection groove; 52 - Bearing platform corrugated pipe; 53 - Fixed groove; 6 - Pile foundation.

[0056] Same or corresponding markings in the figure represent the same or corresponding parts. Detailed implementation manners

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer and more understandable, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Herein, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0058] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] It should be understood that the terms "include / comprise", "consist of", or any other variant is intended to cover non-exclusive inclusion, such that a product, device, process, or method including a series of elements not only includes those elements but also, when necessary, other elements not explicitly listed, or also includes elements inherent to such product, device, process, or method. Without further limitation, the elements defined by the statements "include / comprise..." or "consist of..." do not exclude the existence of additional identical elements in the product, device, process, or method including the said elements.

[0060] It is also necessary to understand that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device, component, or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation to the present invention.

[0061] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise clearly and specifically defined.

[0062] [[ID=)15]]The present invention relates to the technical field of civil engineering. The present invention provides an assembled energy-dissipating and self-centering pier system and its assembly method, as Figure 1-14As shown, this pier system uses components such as split piers, a pile cap 5, a dual-effect self-centering energy-dissipating shock absorber 1, and a folded mild-steel energy-dissipating shock damper 4. By prefabricating in the factory and then transporting to the site for assembly, it solves the problems in the prior art of the connection technology of prefabricated pier systems, such as unclear self-seismic performance and weak stress at the joints. It can eliminate the original safety hazards of prefabricated connection technology and meet the requirements of municipal bridges for seismic safety and stability. Optimizing the prefabricated connection technology of the existing pier system can better meet the application needs of municipal bridges, explore innovative technologies for municipal bridges, practically implement the concept of cost reduction and efficiency increase, and achieve the green development of municipal bridges.

[0063] The implementation of the present invention will be described in detail below in conjunction with preferred embodiments.

[0064] Embodiment

[0065] The present invention provides a self-centering pier system, as Figure 1 、 12 shown in Figures -14, this pier system mainly includes four major parts: a pile cap 5, piers, a dual-effect self-centering energy-dissipating shock absorber 1, and a folded mild-steel energy-dissipating shock damper 4. Among them, the pile cap 5 is fixedly connected to the ground, the piers are arranged on the pile cap 5, the dual-effect self-centering energy-dissipating shock absorber 1 connects the pile cap 5 and the piers, and the folded mild-steel energy-dissipating shock damper 4 is arranged on the piers. The combination of the dual-effect self-centering energy-dissipating shock absorber 1 and the folded mild-steel energy-dissipating shock damper 4 can greatly reduce the impact of natural disasters such as earthquakes on the pier system, greatly improve the natural disaster resistance ability of the pier system, and reduce the losses brought by the bridge after an earthquake.

[0066] Among them, as Figure 1 、 2 、3, 4, 5, 7, 11 shown, the dual-effect self-centering energy-dissipating shock absorber 1 includes a shock-absorbing rod 12, and the shock-absorbing rod 12 is arranged in a shock-absorbing channel 23. The shock-absorbing channels 23 are respectively opened on the pile cap 5 and the piers, and the shock-absorbing channels 23 on the pile cap 5 and the piers are in a connected state after the pile cap 5 and the piers are assembled. Installing the shock-absorbing rod 12 into the shock-absorbing channel 23 can connect the pile cap 5 and the piers together. At the same time, a plastic hinge area 35 is provided at the lower end of the piers, and the folded mild-steel energy-dissipating shock damper 4 is installed on the plastic hinge area 35. The shock-absorbing rod 12, the plastic hinge area 35, and the folded mild-steel energy-dissipating shock damper 4 cooperate with each other to reduce shock and reduce the damage suffered by the pier system during an earthquake.

[0067] Among them, as Figure 2 、 3As shown, external threads 13 are provided at both the upper and lower ends of the shock-absorbing rod 12. A fixing groove 53 is formed on the bearing platform 5. During installation, a fixed connection nut 15 is arranged in the fixing groove 53, and the shock-absorbing rod 12 is fixed by the threaded connection between the fixed connection nut 15 and the external thread 13. The fixing groove 53 communicates with the shock-absorbing channel 23. Similarly, an anchoring groove 22 is also provided at the upper end of the pier body, and an anchoring connection nut 14 adapted to the external thread 13 is arranged in the anchoring groove 22. The anchoring groove 22 also communicates with the shock-absorbing channel 23. In specific operations, the shock-absorbing rod 12 is fixed to the fixed connection nut 15 in the fixing groove 53. Then, after aligning the shock-absorbing channel 23 on the pier body with the shock-absorbing rod 12, the pier body is installed on the bearing platform 5. Then, the anchoring connection thread 14 is fixed to the shock-absorbing rod 12, and the installation is completed.

[0068] To ensure the shock-absorbing effect of the shock-absorbing rod 12, the shock-absorbing rod 12 is made of an elastic material. In this embodiment, the material of the shock-absorbing rod 12 is selected as a shape memory alloy rod made of shape memory alloy material.

[0069] To further enhance the shock-absorbing effect of the shock-absorbing rod 12, the dual-effect self-resetting energy-dissipating shock-absorbing device 1 further includes a disc spring 11. The disc spring 11 is arranged at the lower end of the external thread 13 at the upper end of the shock-absorbing rod 12. Specifically, the width of the disc spring 11 is smaller than the width of the anchoring groove 22, and the length of the disc spring 11 in its normal state is less than or equal to the length of the anchoring groove 22. After installing the disc spring 11 on the shock-absorbing rod 12, the anchoring connection nut 14 is tightened. The lower end of the disc spring 11 overlaps with the anchoring groove 22, and the upper end of the disc spring 11 overlaps with the anchoring connection nut 14. The anchoring connection nut 14 and the anchoring groove 22 cooperate to fix the disc spring 11. When an earthquake occurs, the function of the shock-absorbing rod 12 is mainly to provide lateral stiffness, self-resetting ability, and elastic energy-dissipating shock-absorbing ability for the bridge pier system. The function of the disc spring 11 is mainly to provide assistance for the self-resetting of the shock-absorbing rod 12 again, and also to supplement the elastic energy-dissipating shock-absorbing of the shock-absorbing rod 12. Energy-dissipating shock absorption is achieved through the friction between the disc springs 11 and between the disc spring 11 and the shock-absorbing rod 12. And the combination form can be reasonably adjusted according to the load-bearing capacity and self-resetting ability required by the bridge pier system.

[0070] To ensure the use effect of the disc spring 11, in this embodiment, multiple disc springs 11 are used in a stacked manner, and they can be combined in a stacked combination mode ( Figure 4 ), or in an opposed combination mode ( Figure 5 ), or in a composite combination mode that combines the two.

[0071] In this embodiment, to facilitate installation more conveniently, the pier body includes two parts, a pier head 2 and a pier bottom 3. The anchoring groove 22 is arranged at the top of the pier head 2. The shock-absorbing channels 23 on the pier head 2, the pier bottom 3, and the bearing platform 5 are in a communicating state, as Figure 6 shown,7 As shown in Figures 8, 9, and 11, an extended pier head steel bar 21 is provided at the lower end of the pier head 2, and a pier bottom bellows 31 adapted to the pier head steel bar 21 is reserved at the upper end of the pier bottom 3. An extended pier bottom steel bar 37 is also provided at the lower end of the pier bottom 3, and a cap beam bellows 52 adapted to the pier bottom steel bar 37 is reserved at the upper end of the cap beam 5. During installation, the pier head steel bar 21 is installed into the pier bottom bellows 31, and the pier bottom steel bar 37 is installed into the cap beam bellows 52, and then grouted. On the one hand, it ensures the stability of the connection between the pier head 2, the pier bottom 3, and the cap beam 5. On the other hand, through grouting and socket connection, it avoids the occurrence of joints at the interface between the bottom of the pier and the bottom of the cap beam, ensures the continuity of the force of the pier, and enables the plastic hinge of the pier to appear at the preset position.

[0072] At the same time, in order to ensure the connection stability between the pier bottom 3 and the cap beam 5, as Figure 8 、 9 shown, a corrugated pier bottom joint 36 is provided at the lower end of the pier bottom 3. The corrugated pier bottom joint 36 adopts a circumferential corrugated structure. A cap beam connection groove 51 adapted to the pier bottom joint 36 is opened at the upper end of the cap beam 5. The corrugated pier bottom joint 36 and the adapted cap beam connection groove 51 form an embedded connection. This embedded connection is an enlarged head (pier bottom joint 36) reserved by the pier bottom 3, and the enlarged head is embedded into the cap beam connection groove 51 for connection. The bottom of the embedded joint extends a sufficient length of longitudinal steel bars (pier bottom steel bar 37). During connection, the longitudinal steel bars are connected into the internal grouting bellows of the cap beam (cap beam bellows 52). It cleverly utilizes the dual ideas of socket connection and grouting connection, and also indirectly expands the connection contact surface, ensuring the reliability of the connection between the pier bottom 3 and the cap beam 5. Moreover, the embedded joint adopts a corrugated structure, which can greatly improve the connection strength and stability between the pier bottom 3 and the cap beam 5, and at the same time prevent the pier system from undergoing torsional deformation, providing a stable foundation for the functions of the folded mild steel energy dissipation shock absorber 4 and the self-resetting energy dissipation dual-effect shock absorber 1 in the pier system.

[0073] As Figure 7 shown, a plastic hinge region 35 is provided on the pier bottom 3. Plastic hinge region transition zones 34 are provided above and below the plastic hinge region 35. Specifically, the pier bottom 3 can be divided into the upper end 32 of the pier bottom, the plastic hinge region transition zone 34, the plastic hinge region 35, the plastic hinge region transition zone 34, and the lower end 33 of the pier bottom. Among them, the width and thickness of the upper end 32 of the pier bottom and the lower end 33 of the pier bottom are the same as those of the pier head 2, while the width and thickness of the plastic hinge region 35 are smaller than those of the upper end 32 of the pier bottom. Specifically, the cross-section of the upper end 32 of the pier bottom is a polygon, and the cross-section of the plastic hinge region 35 is also a polygon, and the plastic hinge region 35 is obtained by proportionally reducing the upper end 32 of the pier bottom.

[0074] The two transition zones 34 of the plastic hinge zones are symmetric along the plastic hinge zone 35. Taking the transition zone 34 of the plastic hinge zone above the plastic hinge zone 35 as an example: the upper boundary of the transition zone 34 of the plastic hinge zone is connected to the lower boundary of the upper end 32 of the pier bottom, the lower boundary of the transition zone 34 of the plastic hinge zone is connected to the upper boundary of the plastic hinge zone 35, and the transition zone 34 of the plastic hinge zone is an arc segment. Specifically, the width of the end of the transition zone 34 of the plastic hinge zone connected to the upper end 32 of the pier bottom is the width of the upper end 32 of the pier bottom minus the width of the folded mild steel energy dissipation shock absorber 4, and the width of the end of the transition zone 34 of the plastic hinge zone connected to the plastic hinge zone 35 is the same as the width of the plastic hinge zone 35. By defining the plastic hinge zone 35 and the transition zone 34 of the plastic hinge zone, it is ensured that the moment of inertia of the cross-section gradually decreases and the flexural capacity of the cross-section gradually decreases, preventing sudden changes in the flexural capacity of the cross-section and brittle failure of the pier system under the action of load. At the same time, the plastic hinge zone 35 controls the flexural capacity of the cross-section by reducing the cross-section, and the lower half of the pier bottom 3 is set as the switch to activate the folded mild steel energy dissipation shock absorber 4 and the dual-effect self-resetting energy dissipation device 1. By presetting the damaged area, other components of the pier system are protected, and the purpose of predicting the failure mode of the pier system is achieved.

[0075] Specifically, by weakening the cross-sectional area of the plastic hinge zone 35 of the pier bottom 3, the flexural moment of inertia of the pier bottom 3 is reduced, and then the flexural capacity level of the pier bottom 3 is reduced, so that the pier bottom 3 yields first under the action of earthquake and enters the plastic state, forming an artificial activation control switch. Under the action of earthquake, the moment of the plastic hinge zone 35 is the largest, and the plastic hinge zone 35 deforms first. After plastic deformation, the pier system will rotate along the preset plastic hinge zone 35, thereby activating the corresponding functions of the externally installed folded mild steel energy dissipation shock absorber 4 and the internally installed dual-effect self-resetting energy dissipation device 1. Therefore, the plastic hinge zone 35 is called the activation control switch.

[0076] Such as Figure 10As shown in the figure, the folding soft steel energy dissipation shock absorber 4 includes mounting end plates 41 and a folding soft steel steel boot 42. Two mounting end plates 41 are respectively fixedly installed at both ends of the folding soft steel steel boot 42. At the same time, the two mounting end plates 41 are respectively fixedly installed on the upper end 32 and the lower end 33 of the pier bottom. The two mounting end plates 41 fix the folding soft steel steel boot 42 to the pier bottom 3. In order to ensure that the mounting end plate 41 and the transition zone 34 of the plastic hinge area do not affect each other, in this embodiment, the width of the mounting end plate 41 plus the width of the transition zone 34 of the plastic hinge area is equal to the width of the upper end 32 of the pier bottom. The folding soft steel steel boot 42 is provided with creases. When in use, the folding soft steel steel boot 42 can be folded in half along the creases for use. The folding soft steel steel boot 42 is made of low yield point steel, which has a better energy dissipation and shock absorption level. Through the tensile and compressive deformation along the creases, the energy input by the earthquake can be dissipated. At the same time, the folding soft steel steel boot 42 is arranged on the four surfaces of the plastic hinge area 35, which can not only protect the plastic hinge area 35, but also achieve uniform energy dissipation and shock absorption around, preventing the uncertainty of the earthquake incidence angle.

[0077] Of course, if the pier system is a cylindrical system, then the folding soft steel energy dissipation shock absorber 4 also needs to be set to a matching cylindrical shape.

[0078] As Figure 12 , 13 shown in the figure, when the pier system encounters a minor earthquake, the pier system has a small horizontal displacement, and the plastic hinge area 35 set at the pier bottom 3 shows slight damage, successfully activating the folding soft steel energy dissipation shock absorber 4, causing a certain elastic deformation of the folding soft steel steel boot 42 on the outer side of the lower end of the pier system. The shock absorption rod 12 undergoes elastic deformation following the swing of the pier system, playing a role in energy dissipation and shock absorption. After the earthquake, due to the ability of the shape memory alloy of the shock absorption rod 12 to restore its original shape, it provides a restoring force for the pier system to return to its original position. The disc spring 11 at the upper end of the pier system is jointly affected by the displacement at the upper end of the pier system and the constraint of the anchor connection nut 14, generating a certain compressive deformation, playing a role in frictional energy dissipation and self - resetting, and again helping the pier system to resist the earthquake action and return to the original state.

[0079] When the pier system encounters a major earthquake, the pier system has a large horizontal displacement, and the plastic hinge area 35 set at the pier bottom 3 shows serious damage. The folding soft steel energy dissipation shock absorber 4 quickly enters the working state, causing a large reciprocating compressive and tensile deformation of the folding soft steel steel boot 42 on the outer side of the lower end of the pier system, giving full play to its own energy dissipation and shock absorption function. The shock absorption rod 12 and the disc spring 11 also quickly play their roles, providing sufficient restoring force and energy dissipation and shock absorption capacity for the pier system, so that the pier system does not generate excessive residual displacement after the earthquake. By disassembling and replacing the damaged components, it helps the bridge quickly resume its service state and reduces the economic losses caused by traffic interruption.

[0080] When the pier system encounters a huge earthquake, large displacements occur in the pier system, and serious damage appears in the plastic hinge area 35 set at the bottom of the pier 3. The function of the folded mild steel energy dissipation shock absorber 4 is fully activated, causing the folded mild steel boots 42 on the outer side of the lower end of the pier system to undergo extremely large reciprocating compression and tensile deformations, and its energy dissipation and shock absorption effect is exerted to the extreme. The shock-absorbing rod 12 undergoes large deformations to adapt to the large swing of the pier system, and the disc spring pieces 11 are also extremely compressed. Both of them exert their self-resetting and energy dissipation dual-effect shock absorption mechanisms to the extreme, preventing the pier system from collapsing and traffic interruption, and reducing the losses caused by the earthquake to the bridge.

[0081] To further deepen the understanding of the present invention, the present invention also provides an assembly method for a self-resetting pier system, which includes the following steps:

[0082] 1. Material selection:

[0083] The pier head 2 and the pier bottom 3 are prefabricated in a bridge prefabrication factory. The main materials used are concrete and ordinary steel bars: the concrete is selected with a strength grade of C40, and the mix ratio of the concrete needs to meet the requirements of relevant specifications according to the environmental category provided in the survey report; the ordinary steel bars are selected as HRB400E, and the HRB400E steel bars shall comply with "Steel for Reinforced Concrete - Part 2: Hot Rolled Ribbed Bars" (GB 1499.2 - 2018), and the post - heat treatment (high - pressure water penetration) process shall not be used. It shall meet the requirements of the carbon equivalent in the "Code for Design of Concrete Structures of Railway Bridges and Culverts", and its seismic performance shall meet the relevant requirements of the "Code for Seismic Design of Buildings" (GB 50011 - 2010 (2016 Edition)). Before concrete construction, mix ratio tests and durability evaluation item tests must be carried out. Considering factors such as construction procedures, construction period arrangements, and environmental impacts, through tests, the concrete strength index is ensured. The mix ratio of the concrete should meet the requirements of relevant durability specifications. After the materials are prepared as required, the structural components are processed and prefabricated.

[0084] 2. Pier head 2 processing:

[0085] When manufacturing the pier head 2, it is necessary to carefully review and be familiar with the drawings, cross-check the relevant drawings with each other, and focus on verifying the dimensions of the pier head 2, the reinforcement layout, etc. Any doubts and errors should be corrected in a timely manner. The formwork for the pier head 2 is preferably made of steel formwork, and the steel formwork should be processed to adapt to the arc change section of the pier head 2. Attention should be paid to reserving the anchorage groove 22 and the shock-absorbing channel 23, and the space sizes of the anchorage groove 22 and the shock-absorbing channel 23 should meet the requirements for the anchorage of the disc spring pieces 11 and the shock-absorbing rods 12. A shock-absorbing channel 23 through which the shock-absorbing rod 12 passes should be reserved at the exact center position of the pier head 2 to ensure that the shock-absorbing rod 12 can pass smoothly along the shock-absorbing channel 23. When placing the steel reinforcement cage, the length of the longitudinal stressed main reinforcement should be greater than the height of the pier head 2, and the length of the outer extension of the longitudinal stressed reinforcement should not be less than 10 times its own diameter. After the steel reinforcement cage is placed, concrete is poured. Since the steel reinforcement is dense, attention should be paid to strengthening the vibration during construction to ensure the quality of concrete pouring. After pouring, sprinkle water for curing, and remove the formwork after reaching the predetermined strength. The appearance of the pier head 2 must be smooth, clean, without oil stains and slurry leakage.

[0086] 3. Processing of the pier bottom 3:

[0087] When processing the pier bottom 3, a pier bottom bellows 31 should be reserved at the upper end. The diameter of the pier bottom bellows 31 should be greater than 2 times the diameter of the connecting longitudinal reinforcement, and the full length should not be less than 24 times the diameter of the connecting longitudinal reinforcement, and splicing is not allowed. The height of the conventional section of the pier bottom 3 is reasonably adjusted and designed according to the total height of the pier body system, and the formwork can be set according to the conventional structural dimensions of the pier body. It should be particularly noted that a plastic hinge region 35 is provided in the pier bottom 3, and the width changes from the plastic hinge region transition zone 34 to the plastic hinge region 35 and then to the plastic hinge region transition zone 34. A steel formwork is set for the plastic hinge region 35 to adapt to the arc change of the pier body section in the plastic hinge region 35. In addition, attention should be paid to reserving the installation positions for the installation end plates 41 at the upper end 32 and the lower end 33 of the pier bottom. In addition, a pier bottom joint 36 is provided at the bottom end of the pier bottom 3. The pier bottom joint 36 reserves a sufficient length of longitudinal stressed reinforcement, and the reinforcement is extended into the cap beam bellows 52 reserved in the cap beam 5 to complete the embedded connection. And the periphery of the pier bottom joint 36 is constructed with a corrugated structure to increase the connection strength. A shock-absorbing channel 23 is provided inside the pier bottom 3 for the series connection of the shock-absorbing rods 12. When processing the pier bottom 3, there are many cross-section change positions, and steel formwork is used to adapt to the processing and manufacturing of the variable pier bottom 3.

[0088] 4. Processing of the folding type soft steel energy dissipation shock absorber 4:

[0089] The foldable mild steel energy dissipation and shock absorbing damper 4 is processed in a metal structural component processing plant. During processing, low yield point mild steel is used, which has a better energy dissipation and shock absorbing capability. The main part of the damper is a foldable mild steel boot 42, which looks like a "boot" and is placed on the outside of the plastic hinge area 35 on the pier bottom 3. The foldable mild steel boot 42 is set to be foldable, which can cause deformation along the crease when subjected to stress. A mounting end plate 41 is provided at the end of the foldable mild steel boot 42, and bolt holes are reserved around the mounting end plate 41 to facilitate high-strength bolts to use the bolt holes to connect the mounting end plate 41 to the upper end 32 and the lower end 33 of the pier bottom. In addition, in order to facilitate the installation of the foldable mild steel energy dissipation and shock absorbing damper 4 in the plastic hinge area 35, it can be divided into two parts, left and right, which are processed separately in the processing plant and then spliced together when transported to the on-site installation.

[0090] 5: Processing of self-resetting double-effect energy-consuming shock-absorbing device:

[0091] When manufacturing a self-resetting, dual-effect energy-absorbing shock-absorbing device at a metal structural component processing plant, the main components to be processed include the disc spring 11, shock-absorbing rod 12, and anchoring nut 14. When machining the disc spring 11, the calculated design parameters, including its inner diameter d, outer diameter D, thickness t, and height h, should be followed. When machining the shock-absorbing rod 12, external threads 13 should be provided at both ends to facilitate connection between the anchoring nut 14 and the fixed nut 15.

[0092] 6: Construction of Platform 5:

[0093] After the components mentioned in step 15 are processed, all processed components are transported to the site for assembly and connection. Before assembly, the pile foundation 6 of the bridge pier system must be constructed first. Drilling and piling are carried out at the original pile positions. The allowable thickness of the sediment is controlled to be no more than 100mm. It should be noted that friction piles generally use no more than 100mm, and rock-socketed piles generally use no more than 50mm.

[0094] After the pile foundation 6 is completed, the cap 5 is constructed and the cap 5 reinforcement should take measures to isolate the pile head concrete so that it can be kept clean after the pile head concrete is removed;

[0095] When constructing the cap 5, a cap connection groove 51 and a cap corrugated pipe 52 are reserved. The cap connection groove 51 is configured as a corrugated structure, and the cap corrugated pipe 52 is installed at the lower end of the cap connection groove 51 for connection to the pier bottom reinforcement 37 on the pier bottom 3. A fixing groove 53 and a shock-absorbing channel 23 are provided at the center of the cap 5. The processed shock-absorbing rod 12 is passed through the shock-absorbing channel 23 and then anchored to the fixing nut 15 in the fixing groove 53 at the lower end of the cap 5.

[0096] 7: Pier bottom 3 assembly:

[0097] Use a crane to lift the pier bottom 3 transported to the site, adjust its position in the air until the pier bottom steel bars 37 extending outside the pier bottom 3 are aligned with the pier cap bellows 52 on the pier cap 5, and keep the corrugated structure of the pier bottom joint 36 aligned with the reserved pier cap connection groove 51 on the pier cap 5. Then slowly lower the pier bottom 3 until the pier bottom steel bars 37 enter the pier cap bellows 52. At this time, start pouring high-strength grouting material. After pouring is completed, directly place the pier bottom 3 into the pier cap connection groove 51. Wait for the high-strength grouting material to solidify, and the assembly of the pier bottom 3 is completed.

[0098] 8: Assembly of the folded soft steel energy dissipation shock absorber 4:

[0099] Place the left part of the processed folded soft steel energy dissipation shock absorber 4 on the left side of the plastic hinge area 35, and then place the other half of the folded soft steel energy dissipation shock absorber 4 on the right side of the plastic hinge area 35. Adjust the position for splicing. After splicing is completed, use high-strength bolts to pass through the reserved bolt holes along the installation end plate 41 and anchor them on the pier bottom 3, and tighten them with high-strength nuts to complete the assembly.

[0100] 9: Assembly of the pier head 2:

[0101] Lift the pier head 2 transported to the site and hover it in the air. Adjust the position of the pier head 2 so that the reserved shock absorption channel 23 inside the pier head 2 is aligned with the shock absorption rod 12, and the pier head steel bars 21 on the pier head 2 are aligned with the pier bottom bellows 31 reserved at the upper end 32 of the pier bottom. Then slowly lower the pier head 2 until the pier head steel bars 21 on the pier head 2 extend into the pier bottom bellows 31, and pour in the well-stirred high-strength grouting material. Lower the pier head further so that the cross-sections of the pier head 2 and the pier bottom 3 are aligned and keep the connection state. Wait for the high-strength grouting material to harden and solidify;

[0102] Next, in the reserved anchorage groove 22 of the pier head 2, sleeved the processed disc spring 11 onto the shock absorption rod 12, install it according to the pre-calculated combination method of the disc spring 11, and finally tighten the anchoring connection nut 14 on the external thread 13 at the upper end of the shock absorption rod 12 to complete the connection. Thus, all the construction and assembly work of the bridge pier system mentioned in the present invention is completed.

[0103] Compared with the prior art, the present invention has at least the following excellent features:

[0104] 1. Activation switches of the preset self-centering energy-dissipating shock absorber and the folded soft steel energy-dissipating shock damper 4 in the present invention: The pier base 3 presets a plastic hinge region 35 by changing the cross-section, which consists of the pier head 2 - the upper end 32 of the pier base - the transition region 34 of the plastic hinge region - the plastic hinge region 35. The cross-section of the pier body continuously decreases, the moment of inertia of the cross-section continuously decreases, and the flexural capacity of the pier system continuously decreases. Under the action of an earthquake, the plastic hinge region 35 deforms first, indirectly activating the folded soft steel energy-dissipating shock damper 4 arranged outside the plastic hinge region 35 and the self-centering energy-dissipating shock absorber arranged inside the pier base 3. By controlling the flexural capacity of the cross-section, the predictability of damage is achieved, and it occurs according to the predicted failure state.

[0105] 2. The present invention adopts a combined connection method of grouting type and socket type. To ensure the reliability of the connection between the pier base 3 and the bearing platform 5, the pier base 3 and the bearing platform 5 are connected in a socket type with a pier base joint 36 - a connecting groove 51 of the bearing platform. At the same time, the lower end 33 of the pier base reserves pier base steel bars 37, and the upper end of the bearing platform 5 reserves bearing platform corrugated pipes 52. The pier base steel bars 37 are inserted into the bearing platform corrugated pipes 52 for grouting connection. On the one hand, the reliability of the connection is ensured; on the other hand, through the combined connection of grouting and socket type, the joint is avoided from appearing at the interface position between the pier base 3 and the bearing platform 5, ensuring the continuity of the force of the pier system, and enabling the plastic hinge region 35 of the pier base 3 to appear at the preset position.

[0106] 3. The present invention makes the pier base joint 36 and the connecting groove 51 of the bearing platform adopt a corrugated structure. The corrugated pier base joint 36 is embedded into the matching connecting groove 51 of the bearing platform, fitting perfectly together, which can prevent the pier system from undergoing torsional deformation and provides a stable foundation for the function of the pier system to play.

[0107] 4. The present invention sets a folded soft steel energy-dissipating shock damper 4 outside the plastic hinge region 35 of the pier base 3. When the pier system undergoes a swinging reciprocating motion under the action of an earthquake, the folded soft steel energy-dissipating shock damper 4 outside the pier base 3 will deform along the crease. The folded soft steel energy-dissipating shock damper 4 in the swinging direction of the pier system undergoes compressive deformation, and the folded soft steel energy-dissipating shock damper 4 in the direction opposite to the swinging direction of the pier system undergoes tensile deformation. The folded soft steel energy-dissipating shock damper 4 consumes the energy input into the pier system by the earthquake through its own compressive and tensile deformations, playing a role in shock absorption and energy dissipation. At the same time, the folded soft steel energy-dissipating shock damper 4 can be divided into two parts, an installation end plate 41 and a folded soft steel steel boot 42, for splicing, with a simple structure and convenient installation and disassembly.

[0108] 5. The present invention is provided with a shock absorber rod 12 and a disc spring 11 shock absorption device inside the pier system. The shock absorber rod 12 can not only provide lateral stiffness for the pier system, but also help the pier system have better self-centering ability. The disc spring 11 installed in the anchorage groove 22 of the pier head 2 can provide assistance for the reset of the pier system. At the same time, the super-elastic deformation ability of the shock absorber rod 12 itself and the friction between the disc springs 11 and between the disc spring 11 and the shock absorber rod 12 consume seismic energy for the pier system.

[0109] 6. The present invention can improve the seismic safety of municipal bridges and prevent collapse damage in major earthquakes. When the pier system encounters minor earthquakes, the pier system undergoes small horizontal displacements, causing a certain elastic deformation of the folded soft steel energy-dissipating shock absorber 4 on the outside of the pier bottom 3. The plastic hinge area 35 provided at the pier bottom 3 is not significantly damaged. The disc spring 11 of the pier head 2 is subjected to the displacement of the pier head 2 and the action of the restraint shock absorber rod 12, generating a certain amount of compressive deformation, playing a role in friction energy dissipation and self-resetting. In addition, the shock absorber rod 12 undergoes elastic deformation, providing a restoring force for the pier system to return to its original position;

[0110] When the pier system encounters major earthquakes, the pier system undergoes large horizontal displacements, causing large reciprocating compression and tension deformations of the folded soft steel energy-dissipating shock absorber 4 on the outside of the pier bottom 3 of the pier system, giving full play to its own energy-dissipating and shock-absorbing function. Plastic damage appears in the plastic hinge area 35 provided at the pier bottom 3 of the pier system. The disc spring 11 of the pier head 2 of the pier system is subjected to the displacement of the upper end of the pier system and the action of the restraint shock absorber rod 12, generating large compressive deformation, playing a role in friction energy dissipation and self-resetting assistance. In addition, the shock absorber rod 12 undergoes large deformations, providing a restoring force for the pier system to return to its original position. It prevents the pier system from generating excessive residual displacements after the earthquake, causing difficulties in repair;

[0111] When the pier system encounters huge earthquakes, the pier system undergoes large displacements, causing large reciprocating compression and tension deformations of the folded soft steel energy-dissipating shock absorber 4 at the pier bottom 3 of the pier system. Its own energy-dissipating and shock-absorbing function is exerted to the extreme. Severe damage appears in the plastic hinge area 35 provided at the pier bottom 3 of the pier system. The disc spring 11 of the pier head 2 of the pier system is subjected to the displacement of the upper end of the pier system and the action of the shock absorber rod 12, and the amount of compressive deformation is exerted to the extreme. The functions of friction energy dissipation and self-resetting assistance reach the strongest. In addition, the shock absorber rod 12 undergoes large plastic deformations, providing energy dissipation, shock absorption and reset for the pier system, preventing the pier system from collapsing and causing traffic interruption.

[0112] 7. The assembly method provided by the present invention can achieve rapid on-site installation, greatly saving the construction period. Each component (pier head 2, pier bottom 3, folded mild steel energy dissipation shock absorber 4, disc spring 11, shock absorber rod 12, anchoring connection nut 14, etc.) constituting the pier system can be processed and prefabricated in the factory, ensuring the project quality, reducing labor costs, saving the construction period, and reducing environmental pollution caused by on-site construction.

[0113] 8. The present invention can achieve rapid replacement and repair after seismic damage. After the folded mild steel energy dissipation shock absorber 4 arranged outside the plastic hinge area 35 suffers plastic damage, it can be replaced by quickly disassembling the bolts. The shock absorber rod 12 and the disc spring 11 arranged at the upper end of the pier system can also be quickly replaced by disassembly. Each pier system segment, especially the lower segment in the plastic hinge area 35, can be prefabricated with new components in the factory and transported to the site for replacement.

[0114] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An assembled energy-dissipating and self-centering bridge pier system, characterized in that Including: A bearing platform fixed on a pile foundation, and a vertically penetrating shock-absorbing channel is provided in the bearing platform; A pier body fixed on the bearing platform, a vertically penetrating shock-absorbing channel is provided in the pier body, and a plastic hinge region is arranged at the lower part of the pier body; A dual-effect self-resetting energy-dissipating shock-absorbing device, including a shock-absorbing rod. In the assembled state, the shock-absorbing channel in the pier body is aligned and communicated with the shock-absorbing channel in the bearing platform, and the shock-absorbing rod is configured to penetrate through the shock-absorbing channel to assemble and connect the pier body and the bearing platform so as to perform energy dissipation and shock absorption and self-resetting under the action of an earthquake; A folded mild steel energy-dissipating shock-absorbing damper is installed in the plastic hinge region of the pier body to perform energy dissipation and shock absorption under the action of an earthquake.

2. The self - resetting pier system according to claim 1, wherein, External threads are provided at both the upper end and the lower end of the shock-absorbing rod, a fixing groove is provided at the bottom of the bearing platform, the fixing groove is communicated with the shock-absorbing channel, and the lower end of the shock-absorbing rod is connected and fixed in the fixing groove through a fixing connection nut; An anchoring groove is provided at the upper end of the pier body, the anchoring groove is communicated with the shock-absorbing channel, and the upper end of the shock-absorbing rod is anchored and fixed in the anchoring groove through an anchoring connection nut.

3. The self-resetting pier system according to claim 2, wherein The dual-effect self-resetting energy-dissipating shock-absorbing device further includes a disc spring; The disc spring is installed at the lower end of the external thread at the upper end of the shock-absorbing rod, the disc spring is arranged in the anchoring groove, and the length of the anchoring groove is greater than or equal to the length of the disc spring in the normal state.

4. The self - resetting pier system according to claim 1, characterized in that, Plastic hinge region transition zones are provided both above and below the plastic hinge region; The width of the plastic hinge region is smaller than the width of the pier body, and the width of the plastic hinge region transition zone gradually shrinks from top and bottom to the plastic hinge region.

5. The self-resetting pier system according to claim 1, wherein The folded mild steel energy-dissipating shock-absorbing damper includes a mounting end plate and a folded mild steel steel boot; The mounting end plates are provided at both ends of the folded mild steel steel boot, and a plurality of creases are provided on the folded mild steel steel boot. Under the action of an earthquake, the folded mild steel steel boot can be folded along the creases.

6. The self - resetting pier system according to claim 1, wherein, The pier body includes a pier head and a pier bottom; The lower end of the pier head is provided with an extended pier head steel bar, a pier bottom corrugated pipe adapted to the pier head steel bar is reserved at the upper end of the pier bottom, the plastic hinge region is arranged in the middle of the pier bottom, the lower end of the pier bottom is provided with an extended pier bottom steel bar, and a bearing platform corrugated pipe adapted to the pier bottom steel bar is reserved at the upper end of the bearing platform.

7. The self - resetting pier system according to claim 6, characterized in that, The lower end of the pier bottom is provided with a corrugated pier bottom joint, and a bearing platform connection groove adapted to the pier bottom joint is provided at the upper end of the bearing platform.

8. The assembly method of the prefabricated energy-dissipating and self-centering pier system according to any one of claims 1-7, characterized in that, Including the following steps: Pre-fabricate the pier body, the dual-effect self-resetting energy-dissipating shock-absorbing device and the folded mild steel energy-dissipating shock-absorbing damper and transport them to the installation site; After building the bearing platform, install the shock-absorbing rod in the dual-effect self-resetting energy-dissipating shock-absorbing device into the shock-absorbing channel on the bearing platform. Then, after aligning the shock-absorbing channel in the pier body with the shock-absorbing rod, install the pier body on the bearing platform and grout; After the grouting is completed, install the folded mild steel energy-dissipating shock-absorbing damper on the plastic hinge region of the pier body, and the installation is completed.

9. The assembly method according to claim 8, wherein, The step of installing the pier body on the bearing platform and grouting includes the following steps: First, align the pier bottom reinforcement at the lower end of the pier bottom with the cap corrugated pipe on the cap. At this time, the shock-absorbing rod passes through the shock-absorbing channel on the pier bottom. Slowly lower the pier bottom until the pier bottom reinforcement extends into the cap corrugated pipe. Then, grout the cap corrugated pipe. Slowly lower the pier bottom again and completely place it into the cap connection groove on the cap. Then align the pier head steel bars with the pier bottom corrugated pipe on the pier bottom, slowly lower the pier head until the pier head steel bars extend into the pier bottom corrugated pipe, then grout the pier bottom corrugated pipe, and slowly lower the pier head again until the pier head is flush with the pier bottom.

10. The assembly method according to claim 9, characterized in that, After the pier head is flush with the pier bottom, the following steps are also included: The disc spring is placed under the external thread on the upper end of the shock absorber rod, and the anchor connection nut is tightened on the upper end of the shock absorber rod to complete the installation.

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