Earthquake-resistant bridge pier with replaceable plastic hinge and installation method

Abstract

The application belongs to the technical field of bridge engineering, and provides a post-earthquake replaceable transfer plastic hinge bridge pier and a mounting method. A first connecting piece of a first pier body prefabricated section and a second connecting piece of a second pier body prefabricated section are fixedly connected through a plastic hinge zone device, a shear resistance device is used in cooperation with connecting glue to improve the shear resistance of a spliced joint, the shear resistance device replaces artificial chiseling, saves manpower, does not damage the bridge pier, has omnidirectional dead angle-free shear resistance, improves the installation efficiency, and improves the safety and service life of the prefabricated bridge pier due to the fact that no chiseling treatment is performed and the bridge pier is not damaged.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, specifically relating to a transferable plastic hinge bridge pier that can be quickly replaced after an earthquake and its installation method. Background Technology

[0002] As a crucial component of transportation systems, bridge structures often serve as vital lifelines after earthquakes. Damage to bridges during an earthquake can severely hinder disaster relief efforts, making it paramount to improve their seismic resistance. Bridge piers, as a vital component of bridges, are among the most susceptible to earthquake-induced bridge damage. Damage to or failure of piers directly impacts the safety and functionality of the bridge structure and is a major reason why post-earthquake bridge repair is difficult. Traditional bridge piers are designed as ductile members according to specifications, utilizing steel yielding and concrete cracking to dissipate seismic energy. While these piers are less prone to collapse during earthquakes, severe damage to the plastic hinge zone after an earthquake poses a significant obstacle to the post-earthquake repair of the entire railway line.

[0003] To address the post-earthquake functional recoverability of bridge piers, scholars from various countries have conducted extensive research. They have designed sacrificial components to dissipate seismic energy, thereby protecting the integrity of the main structural members. Examples include designing swaying pier systems and using prestressing to reposition the structure. However, these designs suffer from problems such as difficulty in replacing damaged components, complex construction, and poor energy dissipation performance. Therefore, some scholars have invented a prefabricated plastic hinge structure for rapid post-earthquake replacement. This structure separates the plastic hinge reinforcement, the abutment, and the reinforcement within the pier body (excluding the plastic hinge). The reinforcement at the plastic hinge is connected by a steel plate located on the top surface of the abutment and above the plastic hinge, allowing the main reinforcement in the plastic hinge area to be replaced after earthquake damage. However, because the reinforcement and steel plate within the pier body and abutment are welded, there are issues with the strength and fatigue of the reinforcement at the welded joints. Furthermore, the post-earthquake plastic hinge of this structure is relatively long, and whether an ideal plastic hinge can be formed, as well as the strength of the pier's plastic hinge, remain unclear. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a transferable plastic hinge bridge pier that can be quickly replaced after an earthquake, thereby solving the problems existing in the prior art.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A removable plastic hinge pier that can be quickly replaced after an earthquake, comprising:

[0007] Pier cap, first pier precast section, second pier precast section, shear resistance device, splicing device, plastic hinge zone device and connecting adhesive;

[0008] The splicing device includes a first splicing component and a second splicing component;

[0009] The pier cap and the first precast section of the pier body are connected. A first connector is provided on the pier cap. One end of the first connector extends out from the first precast section of the pier body and is connected to the first splicing member.

[0010] The second precast section of the pier is provided with a second connector, and a pier connection part is provided at the bottom of the second precast section of the pier. The shear resistance device is located at the bottom of the pier connection part and the top of the first precast section of the pier. One end of the second connector extends out from the second precast section of the pier and is connected to the second splice.

[0011] The top of the first precast section of the pier body is positioned opposite to the bottom of the pier body connection portion, and the connecting adhesive is applied between the first connector and the second connector, as well as between adjacent shear-resistant devices.

[0012] The plastic hinge area device includes a third connector and a precast plate. The two ends of the third connector are respectively connected to the first splicing member and the second splicing member. The precast plate cooperates with the third connector and is disposed between the first splicing member and the second splicing member.

[0013] Preferably, the first connector, the second connector, and the third connector are all steel reinforcement components.

[0014] Preferably, the first splicing component and the second splicing component are both steel plate components, one end of the first connecting component is connected to the first splicing component by a threaded connection, one end of the second connecting component is connected to the second splicing component by a threaded connection, and both ends of the third connecting component are connected to the first splicing component and the second splicing component by a threaded connection, respectively.

[0015] Preferably, the first splicing component and the second splicing component have the same structure, and the first splicing component is provided with a through hole, through which the pier body connecting part passes.

[0016] Preferably, the shear-resistant device located at the top of the first precast section of the pier body is located at the through hole portion of the second splice.

[0017] Preferably, the adhesive is made of epoxy resin.

[0018] Preferably, the shear force resisting device is a wavy shear key.

[0019] Preferably, there are two or more precast slabs arranged around the pier body connection portion, adjacent precast slabs are connected by the connecting adhesive, and the precast slabs are provided with reserved steel bar grooves, which cooperate with the third connector.

[0020] This invention also discloses an installation method for a removable plastic hinge bridge pier that can be quickly replaced after an earthquake. The method utilizes the aforementioned removable plastic hinge bridge pier and includes the following steps:

[0021] S1. Connect the foundation and the first precast section of the pier body, and connect the first connector to the first splice.

[0022] S2. Connect the second connector on the precast section of the second pier to the second splice;

[0023] S3. Place the bonding adhesive on the adjacent shear resistance device;

[0024] S4. After the adhesive between adjacent shear-resistant devices reaches the required strength, connect the third connector to the first splice and the second splice respectively.

[0025] S5. The precast panel is fitted with the third connector and installed between the first splice and the second splice.

[0026] Preferably, in step S5, precast slabs are arranged around the pier body connection portion, and adjacent precast slabs are connected by adhesive.

[0027] Compared with the prior art, the beneficial effects of the present invention include:

[0028] The first connector of the first precast pier section and the second connector of the second precast pier section of the present invention are fixedly connected by a plastic hinge zone device. The shear resistance device and the connecting adhesive work together to improve the shear resistance at the splice joint. The shear resistance device replaces manual roughening, saves manpower, does not damage the pier, provides shear resistance in all directions without dead angles, and improves the installation efficiency. Since no roughening is required, the pier is not damaged, which improves the safety and service life of the precast pier. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the connection structure provided by the present invention;

[0031] Figure 2 A schematic diagram of the pier cap and the first precast section of the pier body provided by the present invention;

[0032] Figure 3 A schematic diagram of the second precast pier section provided by the present invention;

[0033] Figure 4 This is a schematic diagram of the prefabricated slab of the present invention;

[0034] Figure 5 This is a schematic diagram of the splicing process of the foundation, the first precast section of the pier body, and the second precast section of the pier body in this invention;

[0035] Figure 6 This is a schematic diagram illustrating the installation of the third connector of the present invention and its bonding with epoxy resin at the splice seam.

[0036] Figure 7 This is a schematic diagram of the precast panel layout of the present invention;

[0037] Figure 8 This is a schematic diagram of the installation of the prefabricated panel of the present invention.

[0038] in:

[0039] 1. Pier cap; 2. First connector; 3. Shear-resistant device; 4. First splice; 5. First precast pier section; 6. Second connector; 7. Second precast pier section; 8. Second splice; 9. Third connector; 10. Precast slab; 11. Through hole; 12. Pier connection; 13. Reserved rebar groove. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0042] Example:

[0043] Reference Figures 1 to 8 This embodiment provides a novel hybrid connection prefabricated assembly bridge pier, comprising:

[0044] Pier cap 1, first pier precast section 5, second pier precast section 7, shear resistance device 3, splicing device, plastic hinge zone device and connecting adhesive; the splicing device includes first splice 4 and second splice 8;

[0045] Reference Figure 2 The lengths of the pier cap 1 and the first precast section 5 of the pier body are taken from the calculation formula for the plastic hinge length of cast-in-place piers in the "Detailed Rules for Seismic Design of Highway Bridges". A first connector 2 is provided on the pier cap 1. One end of the first connector 2 extends out from the first precast section 5 of the pier body and is connected to the first splice 4. A shear-resistant device 3 is provided at the top of the first precast section 5 of the pier body.

[0046] Reference Figure 3 The second pier precast section 7 is provided with a second connector 6, and a pier connecting part 12 is provided at the bottom of the second pier precast section 7. The shear resistance device 3 is provided at the bottom of the pier connecting part 12. One end of the second connector 6 passes through the second pier precast section 7 and is connected to the second splice 8.

[0047] Reference Figure 4 Both the first splicing component 4 and the second splicing component 8 are steel plate components. The first splicing component 4 and the second splicing component 8 have the same structure. The first splicing component 4 is provided with a through hole 11. The pier body connecting part 12 passes through the through hole 11 on the first splicing component 4. Several connecting holes are provided on the first splicing component 4.

[0048] Reference Figure 5 During the splicing process of the first pier precast section 5 and the second pier precast section 7, the two are connected by a shear-resistant device 3. In this embodiment, the shear-resistant device 3 is a wave-shaped shear key. Before the connection, the first connecting piece 2 and the first splicing piece 4 need to be connected by bolts in a threaded manner, and the second connecting piece 6 and the second splicing piece 8 need to be connected by bolts in a threaded manner.

[0049] Reference Figure 6 After the first precast pier segment 5 and the second precast pier segment 7 are spliced ​​together, the shear-resistant device 3 between them is fixed with adhesive, which in this embodiment is epoxy resin. Once the epoxy resin reaches the required strength, the third connector 9 is installed. The third connector 9 is connected to the first splice 4 and the second splice 8 by bolts in a threaded connection.

[0050] Reference Figure 7 The precast slab 10 of the plastic hinge area device is provided with a reserved steel bar groove 13. The reserved steel bar groove 13 cooperates with the third connector 9 so that it can be installed in the plastic hinge area, which is the space between the first splice 4 and the second splice 8.

[0051] Reference Figure 8The installation of the precast slab 10 of the plastic hinge zone device. The precast slab 10 and the third connector 9 adopt a non-bonded structure, cooperating with the third connector 9 through a pre-reserved steel reinforcement groove 13. The precast slab 10 is arranged around the pier body connection part 12, and adjacent precast slabs 10 are connected by adhesive. When energy-dissipating yield failure occurs, the precast slab 10 is directly removed, the third connector 9 is replaced, and then a new precast slab 10 is installed.

[0052] In this embodiment, the first connector 2, the second connector 6, and the third connector 9 are all steel reinforcement components.

[0053] Meanwhile, this invention also discloses a novel method for installing prefabricated bridge piers with hybrid connections. The method, employing the aforementioned novel prefabricated bridge pier with hybrid connections, includes the following steps:

[0054] S1. Connect the foundation 1 and the first precast section 5 of the pier body, and connect the first connecting piece 2 and the first splicing piece 4;

[0055] S2. Connect the second connector 6 on the second precast section 7 of the second pier to the second splice 8.

[0056] S3. Place the bonding adhesive on the adjacent shear-resistant device 3;

[0057] S4. After the adhesive between adjacent shear-resistant devices 3 reaches the connection and fixing strength, connect the third connector 9 to the first splice 4 and the second splice 8 respectively.

[0058] S5. The precast panel 10 is fitted with the third connector 9 and installed between the first splice 4 and the second splice 8.

[0059] Specifically: In step S5, the precast slab 10 is arranged around the pier body connecting part 12, and adjacent precast slabs 10 are connected by adhesive.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] 1. The first connector 2 of the first precast section 5 of the first pier and the second connector 6 of the second precast section 7 of the second pier are fixedly connected by a plastic hinge zone device. The shear resistance device 3, in conjunction with the connecting adhesive, improves the shear resistance at the splice joint. The shear resistance device 3 replaces manual roughening, saves manpower, does not damage the pier, provides shear resistance in all directions without dead angles, and improves the efficiency of installation. Since no roughening is required, the pier is not damaged, which improves the safety and service life of the precast pier. The first splice 4 makes it possible to bond the epoxy resin layer without the need for a template and avoids the problem of template leakage and contamination of the pier.

[0062] 2. The shear resistance device 3 is a corrugated shear key, which is used to form a fixed connection with the epoxy resin layer, improve the shear resistance between the first pier precast section 5 and the second pier precast section 7, increase the safety performance of the precast pier, and further improve the service life of the precast pier.

[0063] 3. The first splice 4 can be used as a template for bonding the epoxy resin layer in the shear resistance device 3, making construction more convenient.

[0064] 4. The second connector 6 can use steel bars with larger diameter or higher strength, and can be prefabricated together with the foundation 1 and the first pier prefabricated section 5. The splice joint is located on the top surface of the foundation 1 and the first pier prefabricated section 5, which is beneficial to transfer the plastic hinge from the bottom of the pier to the plastic hinge area. Compared with the traditional plastic hinge being arranged at the bottom of the pier where the stress is greater and the plastic hinge length is longer, the position of the plastic hinge in this invention can be controlled, the stress is relatively small and the plastic hinge length is shorter.

[0065] 5. The third connector 9 in the plastic hinge zone device is connected to the first splice 4 and the second splice 8 by bolts. When the pier is under great stress, the third connector 9 will yield first at the plastic hinge device, and the third connector 9 can be directly replaced. The pier is safe during the replacement process and no temporary measures are required. The precast slabs 10 in the plastic hinge zone device are connected by epoxy resin. While playing a role in bearing pressure, it is easy to disassemble and replace when replacing the third connector 9. There is no wet work on site, which is more environmentally friendly and convenient.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for installing a removable plastic hinge bridge pier that can be quickly replaced after an earthquake, characterized in that, A type of removable plastic hinge bridge pier that can be quickly replaced after an earthquake is adopted, the removable plastic hinge bridge pier comprising: Pier cap, first pier precast section, second pier precast section, shear resistance device, splicing device, plastic hinge zone device and connecting adhesive; The splicing device includes a first splicing component and a second splicing component; The pier cap and the first precast section of the pier body are connected. A first connector is provided on the pier cap. One end of the first connector extends out from the first precast section of the pier body and is connected to the first splicing member. The second precast section of the pier is provided with a second connector, and a pier connection part is provided at the bottom of the second precast section of the pier. The shear resistance device is located at the bottom of the pier connection part and the top of the first precast section of the pier. One end of the second connector extends out from the second precast section of the pier and is connected to the second splice. The top of the first precast section of the pier body is positioned opposite to the bottom of the pier body connection portion, and the connecting adhesive is applied between the first connector and the second connector, as well as between adjacent shear-resistant devices. The plastic hinge area device includes a third connector and a precast plate. The two ends of the third connector are respectively connected to the first splicing member and the second splicing member. The precast plate cooperates with the third connector and is disposed between the first splicing member and the second splicing member. The installation method includes the following steps: S1. Connect the foundation and the first precast section of the pier body, and connect the first connector to the first splice. S2. Connect the second connector on the precast section of the second pier to the second splice; S3. Place the bonding adhesive on the adjacent shear resistance device; S4. After the adhesive between adjacent shear-resistant devices reaches the required strength, connect the third connector to the first splice and the second splice respectively. S5. The precast panel is fitted with the third connector and installed between the first splice and the second splice.

2. The installation method for a post-earthquake replaceable transferable plastic hinge bridge pier according to claim 1, characterized in that, The first connector, the second connector, and the third connector are all steel reinforcement components.

3. The installation method for the post-earthquake replaceable transferable plastic hinge bridge pier according to claim 2, characterized in that, Both the first and second splicing components are steel plate components. One end of the first connector is connected to the first splicing component by a threaded connection, one end of the second connector is connected to the second splicing component by a threaded connection, and both ends of the third connector are connected to the first and second splicing components by a threaded connection, respectively.

4. The installation method for a post-earthquake replaceable transferable plastic hinge bridge pier according to claim 2, characterized in that, The first splicing component and the second splicing component have the same structure. The first splicing component is provided with a through hole, and the pier body connecting part passes through the through hole on the first splicing component.

5. The installation method for a post-earthquake replaceable transferable plastic hinge bridge pier according to claim 4, characterized in that, The shear-resistant device, located at the top of the first precast section of the pier, is situated in the through-hole portion of the second splice.

6. The installation method for a post-earthquake replaceable transferable plastic hinge bridge pier according to claim 1, characterized in that, The adhesive is made of epoxy resin.

7. The installation method for a post-earthquake replaceable transferable plastic hinge bridge pier according to claim 1, characterized in that, The shear-resistant device is a wavy shear key.

8. The installation method for a post-earthquake replaceable transferable plastic hinge bridge pier according to claim 1, characterized in that, The number of precast slabs is two or more and they are arranged around the pier body connection part. Adjacent precast slabs are connected by the connecting adhesive. The precast slabs are provided with reserved steel bar grooves, which cooperate with the third connector.

9. The installation method for a post-earthquake replaceable transferable plastic hinge bridge pier according to claim 1, characterized in that: In step S5, precast slabs are arranged around the pier body connection, and adjacent precast slabs are connected by adhesive.

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