A soft steel-ecc concrete connected strong energy dissipation self-resetting fabricated pier, pier system and pier construction method

Abstract

This invention discloses a high-energy-dissipating, self-resetting prefabricated bridge pier with a soft steel-ECC connection, a pier system, and a pier construction method, relating to the field of bridge engineering technology. This invention primarily addresses the problems of poor displacement ductility, insufficient seismic performance, and difficulty in post-earthquake repair of prefabricated concrete bridge piers in high-intensity earthquake zones. The proposed technical solution includes a precast concrete bridge pier, pile foundations, and a slotted plate assembly positioned between the precast concrete bridge pier and the pile foundations. The slotted plate assembly comprises multiple upper slotted plates positioned at the bottom of the precast concrete bridge piers and multiple lower slotted plates positioned at the top of the pile foundations. The upper and lower slotted plates are spaced apart and connected to each other via energy-dissipating components. ECC concrete is then poured, and finally, through-core prestressed tendons are tensioned. This invention effectively improves the energy dissipation and self-resetting capabilities of the bridge piers and enables low-cost, rapid post-earthquake repair of prefabricated bridge piers. The structure is inexpensive and easy to construct.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a high-energy-dissipating self-resetting prefabricated bridge pier with soft steel-ECC concrete connection, a bridge pier system, and a bridge pier construction method. Background Technology

[0002] Bridge piers are crucial components in bridge structures, supporting the main girder and bearing the loads of the bridge deck. They are typically located between the main girder and the foundation, serving to support and transfer loads. The design and type of bridge piers depend on the bridge's span, load, geological conditions, and other factors. Bridge piers can generally be categorized into single-column piers and frame piers. A single-column pier is a single column supporting the bridge, while a frame pier is a structure formed by combining multiple independent piers. Based on materials, bridge piers can be classified as masonry piers, concrete piers, reinforced concrete piers, etc.

[0003] The design and selection of bridge piers requires consideration of various factors, including bridge structural requirements, geological conditions, environmental impact, and economic efficiency. Different types of bridge piers are suitable for different bridge design and construction needs.

[0004] Precast bridge piers are prefabricated concrete components frequently used in bridge construction. These components can be prefabricated and assembled in a factory and then installed on site. Precast bridge piers typically consist of precast concrete columns and beams, which can be custom-manufactured according to specific design requirements and bridge structure. This technology improves construction efficiency, quality, and safety, reduces the impact of construction on traffic, and shortens the project cycle. Precast bridge piers also reduce the need for on-site concrete pouring, lower construction costs, and to some extent reduce environmental impact.

[0005] Existing prefabricated bridge piers generally use socket or grouting sleeve connections. Socket connections require a pier cap, while grouting sleeve connections are cumbersome. Both methods also have problems such as difficulty in repairing after an earthquake and difficulty in self-resetting.

[0006] First, when subjected to external impacts or vibrations, especially under strong seismic loads, traditional prefabricated bridge piers exhibit poor displacement ductility and insufficient seismic performance, making post-earthquake repair difficult. Therefore, when designing prefabricated bridge piers, it is necessary to consider how to minimize the adverse effects of strong earthquakes while ensuring structural stability.

[0007] Secondly, prefabricated bridge piers should possess a certain degree of self-resetting capability after being subjected to external impacts or vibrations, meaning they should be able to return to their original position or posture after the stress has subsided. This self-resetting capability is crucial for ensuring the reliability and safety of the bridge structure. Therefore, the design of prefabricated bridge piers needs to consider how to ensure they possess good self-resetting performance to cope with potential subsequent seismic loads. Summary of the Invention

[0008] The purpose of this invention is to provide a high-energy-dissipating self-resetting prefabricated bridge pier, bridge pier system and bridge pier construction method with soft steel-ECC concrete connection, so as to solve the problems of poor displacement ductility, insufficient seismic performance (poor energy dissipation, large residual displacement, etc.) and difficulty in post-earthquake repair of prefabricated concrete bridge piers in high-intensity earthquake zones.

[0009] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0010] A high-energy-dissipating, self-resetting prefabricated bridge pier with a soft steel-ECC concrete connection includes a precast concrete bridge pier, a pile foundation, and a slotted plate assembly respectively disposed between the precast concrete bridge pier and the pile foundation.

[0011] The slotted plate assembly includes multiple upper slotted plates disposed at the bottom of the precast concrete bridge pier and multiple lower slotted plates disposed at the top of the pile foundation. The multiple upper slotted plates and multiple lower slotted plates are spaced apart and connected to each other by annular positioning members.

[0012] The beneficial effects of adopting the above technical solution are as follows: the present invention enables the precast concrete bridge pier and pile foundation to be initially connected by the slotted plate assembly set between the concrete bridge pier and the pile foundation, and by the annular positioning element set in the upper slotted plate and the lower slotted plate.

[0013] Furthermore, each upper slotted plate is arranged along the circumference of the precast concrete pier, and multiple upper steel plate slots are opened near the outer edge of the upper slotted plate. The annular positioning piece is connected in the upper steel plate slot at the top of the upper slotted plate, and the bottom of the annular positioning piece is connected to the top of the lower slotted plate.

[0014] Furthermore, each lower slotted plate is arranged along the circumference of the pile foundation, and multiple lower steel plate slots are opened near the outer edge of the lower slotted plate. An annular positioning member is connected in the lower steel plate slot at the bottom of the lower slotted plate, and the top of the annular positioning member is connected to the bottom of the upper slotted plate.

[0015] The beneficial effects of adopting the above technical solution are as follows: the present invention can quickly position and connect the upper slotted plate and the lower slotted plate with the annular positioning component by opening the upper steel plate groove and the lower steel plate groove on the outer edge of the upper slotted plate and the lower slotted plate, without the need to use additional connecting components.

[0016] Furthermore, the adjacent upper and lower steel plate grooves are connected by multiple annular energy-consuming components.

[0017] The beneficial effects of adopting the above technical solution are as follows: After the annular positioning members of the upper steel plate groove at the top of the upper slotted plate and the lower steel plate groove at the bottom of the lower slotted plate, the present invention continues to set multiple annular energy dissipation members between the annular positioning members, connecting the upper steel plate groove and the lower steel plate groove on the same horizontal plane. When the pier is under stress, the staggered deformation between the upper slotted plate and the lower slotted plate causes the soft steel of the annular energy dissipation members to yield and dissipate energy, thereby increasing the overall energy dissipation capacity of the pier.

[0018] Furthermore, the bottom of the precast concrete pier is provided with an upper steel pier cap, and an upper slotted plate is provided at the bottom of the upper steel pier cap.

[0019] Furthermore, a lower steel cap is provided at the top of the pile foundation, and a lower slotted plate is provided on top of the lower steel cap.

[0020] The beneficial effects of adopting the above technical solution are as follows: By setting an upper steel cap at the bottom of the precast concrete bridge pier and a lower steel cap at the top of the pile foundation, the present invention can increase the support of the bridge pier, transfer the load, improve the overall stability and safety of the bridge, and effectively reduce the amount of ECC concrete poured on site.

[0021] Furthermore, through-core prestressed tendons are installed at the axial center of the precast concrete piers and pile foundations.

[0022] The beneficial effects of adopting the above technical solution are as follows: prestressed tendons can enhance the load-bearing capacity of concrete components, improve the load-bearing capacity and crack resistance of concrete, and provide restoring force under seismic load, giving the bridge piers a strong self-resetting ability.

[0023] The present invention also provides a prefabricated assembled bridge pier system with a hybrid connection of mild steel and ECC concrete, which includes the above-mentioned bridge pier structure, and also includes cap beams and crossbeams;

[0024] The precast concrete bridge pier adopts a square structure. Its top is connected to the cap beam through a slotted plate assembly. The bridge piers are connected to each other through at least one crossbeam. The two ends of the crossbeam are connected to the bridge piers through slotted plate assemblies.

[0025] This invention also includes a construction method for a high-energy-dissipating, self-resetting prefabricated bridge pier with a soft steel-ECC concrete connection, comprising the following steps:

[0026] S1. After welding the upper slotted plate and the upper steel pier cap, install them at the bottom of the precast concrete pier (they can be directly embedded in the bottom of the concrete pier or connected to the bottom of the concrete pier with bolts). After welding the lower slotted plate and the lower steel pier cap, install them at the top of the pile foundation (they can be directly embedded in the top of the concrete pile foundation or connected to the top of the concrete pile foundation with bolts). The slotting dimensions of each slotted plate should be designed with a certain allowable error.

[0027] S2. Install pad stones between the middle platforms of the upper and lower steel pier caps, and install the annular positioning parts (two semi-circular rings with a certain overlap) in the upper steel plate groove at the top of the upper slotted plate and in the lower steel plate groove at the bottom of the lower slotted plate, and adjust their positions.

[0028] S3. Install the annular energy-consuming components (two semicircular rings with a certain overlap) between the adjacent upper and lower steel plate grooves. The overlapping parts of each annular energy-consuming component should be staggered. After adjusting to the appropriate position, thin steel sheets can be used to fill the gap between the slotted plate and the annular energy-consuming components.

[0029] S4. Erect formwork between the precast concrete piers and pile foundations, pour ECC concrete, and tension the through-core prestressed tendons between the precast concrete piers and pile foundations.

[0030] In step S4, to enhance the connection performance between the ECC concrete and the upper and lower steel pier caps, several studs can be installed on the surfaces of the upper and lower steel pier caps as needed.

[0031] The present invention has the following beneficial effects:

[0032] The present invention provides a high-energy-dissipating self-resetting prefabricated bridge pier and construction method with soft steel-ECC concrete connection. When the bridge pier is subjected to strong earthquake, the alternating deformation of the upper and lower slotted plates will cause the annular soft steel to yield and dissipate energy. At the same time, due to the good ductility of ECC concrete, the bridge pier will not be crushed. The soft steel-ECC concrete forms a good energy dissipation mechanism, which can ensure that the pile foundation and the prefabricated pier body remain elastic.

[0033] Furthermore, the presence of precast concrete piers and prestressed pile foundations can enhance the energy dissipation capacity and self-resetting ability of the piers. After a strong earthquake, the damaged ECC concrete can be removed, replaced with new annular energy-dissipating soft steel, and ECC concrete can be poured again and prestressed. This enables low-cost and rapid post-earthquake repair of precast piers. The present invention is inexpensive and easy to construct. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the assembled annular positioning component in Example 1;

[0036] Figure 3 This is a schematic diagram of the assembled ring-shaped energy-consuming component in Example 1;

[0037] Figure 4 This is a cross-sectional view of the present invention;

[0038] Figure 5This is a schematic diagram of the precast concrete bridge pier after assembly in Example 1;

[0039] Figure 6 This is a schematic diagram of the assembled pile foundation in Example 1;

[0040] Figure 7 This is a structural schematic diagram of the prefabricated and assembled bridge pier system and bridge pier construction method system in Example 2;

[0041] Figure 8 This is an exploded view of the pile foundation connection in Example 2;

[0042] Figure 9 This is an exploded view of the connection between the cap beam and the precast concrete pier in Example 2;

[0043] Figures 1 to 9 The reference numerals in the attached drawings are respectively: 1-precast concrete pier; 2-pile foundation; 3-upper slotted plate; 4-lower slotted plate; 5-ring positioning component; 6-ring energy dissipation component; 7-prestressed tendon; 8-crossbeam; 9-cap beam; 11-upper steel pier cap; 21-lower steel pier cap; 31-upper steel plate groove; 41-lower steel plate groove. Detailed Implementation

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] Please refer to Figure 1-2 This is a structural schematic diagram of a high-energy-dissipating self-resetting prefabricated bridge pier with a soft steel-ECC concrete connection according to an embodiment of this disclosure. In order to solve the problems of poor displacement ductility, insufficient seismic performance (poor energy dissipation, large residual displacement, etc.) and difficulty in post-earthquake repair of prefabricated concrete bridge piers in high-intensity earthquake zones, the specific structure of this embodiment will be described in detail below.

[0047] A high-energy-dissipating self-resetting prefabricated bridge pier with a soft steel-ECC concrete connection includes a precast concrete bridge pier 1, a pile foundation 2, and a slotted plate assembly. The slotted plate assembly is disposed between the precast concrete bridge pier 1 and the pile foundation 2, and is located in the plastic hinge zone at the bottom of the pier, near the top of the pile foundation 2.

[0048] Please refer to Figure 2-4In this embodiment, the slotted plate assembly includes multiple upper slotted plates 3, multiple lower slotted plates 4, annular positioning elements 5, and annular energy-dissipating elements 6. The upper slotted plates 3 and lower slotted plates 4 are steel plate structures. The upper slotted plates 3 are spaced apart at the bottom of the precast concrete pier 1, and are placed at the bottom of the precast concrete pier 1 after being welded to the upper steel pier cap 11. The lower slotted plates 4 are spaced apart at the top of the pile foundation 2, and are placed at the top of the pile foundation 2 after being welded to the lower steel pier cap 21. After the upper slotted plates 3 and lower slotted plates 4 are installed, they are initially positioned and connected and their positions adjusted by the annular positioning elements 5 at the top and bottom and the pad stones placed in the middle.

[0049] Please refer to Figure 2 , Figure 5 , Figure 6 After the positions of the upper slotted plate 3 and the lower slotted plate 4 are adjusted, multiple annular energy-dissipating components 6 are installed between the top and bottom annular positioning components 5. Both the annular positioning components 5 and the annular energy-dissipating components 6 are made of soft steel. The upper slotted plate 3 is arranged around the perimeter of the precast concrete pier 1, and multiple upper steel plate slots 31 are opened near the outer edge of the upper slotted plate 3. The top annular positioning component 5 is connected to the topmost upper steel plate slot 31 of the upper slotted plate 3, and the bottom of the top annular positioning component 5 is connected to the top of the lower slotted plate 4. The lower slotted plates 4 are all arranged around the perimeter of the pile foundation 2, and multiple lower steel plate slots 41 are opened near the outer edge of the lower slotted plate 4. The bottom annular positioning component 5 is connected to the bottommost lower steel plate slot 41 of the lower slotted plate 4, and the top of the bottom annular positioning component 5 is connected to the bottom of the upper slotted plate 3. The upper steel plate slots 31 and lower steel plate slots 41 on the same horizontal plane are connected by annular energy-dissipating components 6.

[0050] Please refer to Figure 4 After the annular energy dissipation component 6 is installed, ECC concrete is poured between the precast concrete pier 1 and the pile foundation 2 using a formwork. To ensure the reliability of the connection between the ECC concrete and the steel pier cap, several studs can be installed on the surface of the steel pier cap for fixation. After the ECC concrete has reached its strength, the prestressed tendons 7 are tensioned at the axial center of the precast concrete pier 1 and the pile foundation 2.

[0051] Under strong earthquakes, the staggered deformation of the upper and lower slotted plates causes the soft steel structure of the annular energy-dissipating component 6 to yield and dissipate energy. Simultaneously, due to the good ductility of the ECC concrete, crushing does not occur. The soft steel and ECC concrete work together to form a good energy dissipation mechanism, ensuring that the pile foundation 2 and the precast concrete pier 1 maintain their elasticity. Furthermore, the presence of prestress significantly enhances the pier's energy dissipation capacity and self-resetting ability. After a strong earthquake, the damaged ECC concrete can be removed, replaced with new annular energy-dissipating soft steel, and ECC concrete can be poured again, with prestressed tendons tensioned, achieving low-cost and rapid post-earthquake repair of the precast pier.

[0052] Example 2

[0053] Please refer to Figure 7 This is a structural schematic diagram of a prefabricated bridge pier system with a soft steel-ECC concrete hybrid connection according to an embodiment of this disclosure. To address the problems of poor displacement ductility, insufficient seismic performance (poor energy dissipation, large residual displacement, etc.) and difficulty in post-earthquake repair of prefabricated bridge pier systems in high-intensity earthquake zones, the specific structure of this embodiment will be described in detail below.

[0054] A precast assembled bridge pier system with a mild steel-ECC concrete hybrid connection includes the bridge pier described in Example 1, and also includes a crossbeam 8 and a cap beam 9.

[0055] Please refer to Figure 7-8 The top of the precast concrete pier 1 is connected to the cap beam 9 through a slotted plate assembly. The piers are connected by at least one crossbeam 8. The crossbeam 8 can be set between two precast concrete piers 1 or between two pile foundations 2. The two ends of the crossbeam 8 are connected to the piers through the slotted plate assembly. The annular positioning component 5 and the annular energy dissipation component 6 are rectangular positioning components and energy dissipation components, and the material is soft steel structure.

[0056] Please refer to Figure 9 The structure of the slotted plate assembly is the same as that of the slotted plate assembly in Embodiment 1, and also includes multiple upper slotted plates 3, multiple lower slotted plates 4, annular positioning components 5, and annular energy-dissipating components 6. The upper slotted plates 3 and lower slotted plates 4 are steel plate structures. The difference is that the annular positioning components 5 and annular energy-dissipating components 6 in Embodiment 1 are square annular positioning components and energy-dissipating components in this embodiment, and both are made of soft steel.

[0057] Specifically, in this embodiment, the precast concrete pier 1, pile foundation 2, and crossbeam 8 are all square in shape.

[0058] Example 3

[0059] This disclosure also includes a construction method for a high-energy-dissipating, self-resetting prefabricated bridge pier with a soft steel-ECC concrete connection. The prefabricated bridge pier described above is constructed using the following steps:

[0060] S1. After welding the upper slotted plate 3 and the upper steel pier cap 11, install them at the bottom of the precast concrete pier 1. After welding the lower slotted plate 4 and the lower steel pier cap 21, install them at the top of the pile foundation 2.

[0061] S2. Install multiple pad stones between the middle platform of the upper steel pier cap 11 and the lower steel pier cap 21, and install the annular positioning parts 5 in the upper steel plate groove 31 at the top of the upper slotted plate 3 and the lower steel plate groove 41 at the bottom of the lower slotted plate 4 respectively, and adjust the positions of the upper slotted plate 3 and the lower slotted plate 4.

[0062] S3. Install the annular energy-consuming component 6 into the upper steel plate groove 31 and the lower steel plate groove 41, which are on the same plane;

[0063] S4. Erect formwork between precast concrete pier 1 and pile foundation 2, pour ECC concrete, and tension the prestressed tendons between precast concrete pier 1 and pile foundation 2.

[0064] Specifically, in step S4, in order to ensure the reliability of the connection between the ECC concrete and the steel pier cap, several studs can be installed on the surfaces of the upper steel pier cap 11 and the lower steel pier cap 21.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-energy-dissipating, self-resetting prefabricated bridge pier with a soft steel-ECC concrete connection, characterized in that, include: Precast concrete piers (1), pile foundations (2), and slotted plate assemblies respectively disposed between the concrete piers (1) and the pile foundations (2); The slotted plate assembly includes multiple upper slotted plates (3) set at the bottom of the precast concrete pier (1) and multiple lower slotted plates (4) set at the top of the pile foundation (2). The multiple upper slotted plates (3) and the multiple lower slotted plates (4) are spaced apart and connected to each other by annular positioning elements (5).

2. The high-energy-dissipating, self-resetting prefabricated bridge pier with soft steel-ECC concrete connection according to claim 1, characterized in that, Each of the upper slotted plates (3) is arranged around the circumference of the precast concrete pier (1), and multiple upper steel plate slots (31) are opened near the outer edge of the upper slotted plate (3). The annular positioning member (5) is connected in the upper steel plate slot (31) at the top of the upper slotted plate (3), and the bottom of the annular positioning member (5) is connected to the top of the lower slotted plate (4).

3. The high-energy-dissipating, self-resetting prefabricated bridge pier with mild steel-ECC concrete connection according to claim 2, characterized in that, Each of the lower slotted plates (4) is arranged along the circumference of the pile foundation (2), and multiple lower steel plate slots (41) are opened near the outer edge of the lower slotted plate (4). The annular positioning member (5) is connected in the lower steel plate slot (41) at the bottom of the lower slotted plate (4), and the top of the annular positioning member (5) is connected to the bottom of the upper slotted plate (3).

4. The high-energy-dissipating, self-resetting prefabricated bridge pier with mild steel-ECC concrete connection according to claim 3, characterized in that, The adjacent upper steel plate groove (31) and the lower steel plate groove (41) are connected by a plurality of annular energy-consuming components (6).

5. The high-energy-dissipating, self-resetting prefabricated bridge pier with mild steel-ECC concrete connection according to claim 1, characterized in that, The bottom of the precast concrete pier (1) is provided with an upper steel pier cap (11), and the upper slotted plate (3) is provided at the bottom of the upper steel pier cap (11).

6. The high-energy-dissipating, self-resetting prefabricated bridge pier with mild steel-ECC concrete connection according to claim 1, characterized in that, The top of the pile foundation (2) is provided with a lower steel pier cap (21), and the lower slotted plate (4) is provided on the top of the lower steel pier cap (21).

7. The high-energy-dissipating, self-resetting prefabricated bridge pier with mild steel-ECC concrete connection according to claim 1, characterized in that, Prestressed tendons (7) are provided at the axial center of the precast concrete pier (1) and the pile foundation (2).

8. A precast assembled bridge pier system with a hybrid connection of mild steel and ECC concrete, characterized in that, The pier structure includes the pier structure described in any one of claims 1 to 7, and also includes a crossbeam (8) and a cap beam (9). The precast concrete pier (1) adopts a square structure, and its top is connected to the cap beam (9) through a slotted plate assembly. The piers are connected to each other through at least one crossbeam (8), and the two ends of the crossbeam (8) are respectively connected to the pier through the slotted plate assembly.

9. A construction method for a high-energy-dissipating, self-resetting prefabricated bridge pier with a soft steel-ECC concrete connection as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Connect the upper slotted plate (3) and the upper steel pier cap (11) and install them at the bottom of the precast concrete pier (1). Connect the lower slotted plate (4) and the lower steel pier cap (21) and install them at the top of the pile foundation (2). S2. Install pad stones between the middle platforms of the upper steel pier cap (11) and the lower steel pier cap (21), and install the annular positioning parts (5) in the upper steel plate groove (31) at the top of the upper slotted plate (3) and in the lower steel plate groove (41) at the bottom of the lower slotted plate (4) respectively, and adjust their positions. S3. Install the annular energy-consuming component (6) between the adjacent upper steel plate groove (31) and lower steel plate groove (41); S4. Set up a formwork between the precast concrete pier (1) and the pile foundation (2), pour ECC concrete, and tension the prestressed tendons (7) between the precast concrete pier (1) and the pile foundation (2).

10. The construction method of the high-energy-dissipating self-resetting prefabricated bridge pier with mild steel-ECC concrete connection according to claim 9, characterized in that, In step S4, after pouring ECC concrete, several studs are installed on the surfaces of the upper steel cap (11) and the lower steel cap (21).

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