Reinforced concrete assembly type hollow pier-bearing platform node structure and construction method thereof

Abstract

The invention relates to a reinforced concrete assembly type hollow pier-bearing platform joint structure and a construction method thereof, and belongs to the technical field of structural engineering. The prefabricated hollow pier column is composed of a prefabricated hollow pier column body, a pier column wrapping steel plate, a replaceable L-shaped energy dissipation device and a bearing platform. The prefabricated pier column and the bearing platform are connected in a socket mode, the pier column is inserted into a socket groove of the bearing platform, a UHPC grouting material is poured into the socket groove, meanwhile, a certain amount of micro-expansion concrete is poured into a hollow part of a socket section of the pier column, and the socket section of the pier column and a socket reinforcement cage are combined into a whole. The steel plate is wrapped outside the bottom of the prefabricated hollow pier column, and the replaceable L-shaped energy consumption device is connected with the pier column wrapping steel plate and the bearing platform through the mounting bolts, so that the energy consumption device and the pier column wrapping steel plate can work together, and the energy consumption capacity of the pier column is enhanced. The overall weight of the prefabricated pier column is reduced, the energy dissipation capacity of the pier column-bearing platform joint is enhanced through the energy dissipation device, and therefore the anti-seismic property of the pier-bearing platform joint is further improved, and meanwhile the structure of the socket section of the pier column is optimized.

Description

Technical Field

[0001] The present invention relates to a bridge pier and abutment structure, in particular to a reinforced concrete assembled hollow bridge pier-abutment node structure and a construction method thereof, belonging to the technical field of structural engineering. Background Art

[0002] Prefabricated bridge piers are gaining popularity in modern bridge construction due to their advantages, including fast construction, high-quality components, and minimal impact on existing traffic and the environment. Since prefabricated piers are manufactured and fabricated in component prefabrication factories, they must be transported to the construction site and hoisted and installed using appropriate lifting equipment to integrate them with other bridge components. Therefore, convenient construction of prefabricated piers on site is crucial.

[0003] In existing prefabricated bridge piers, the majority of them have solid cross-sections, resulting in a heavy overall lifting weight during on-site hoisting, hindering ease of pier construction. Furthermore, in prefabricated pier structures, the performance of the pier-to-cap joint under cyclic loading is a significant factor influencing the seismic performance of the entire structural system. Among existing prefabricated pier-to-cap joints, the socket-and-spigot connection is widely used due to its advantages of simple construction, high tolerance for errors, and reliable joint performance. However, to ensure a reliable joint connection, the pier column must have a certain socket length, necessitating a socket of a certain depth within the cap or cap beam. This results in a larger cap or cap beam, hindering the overall economic efficiency of the prefabricated pier structure. Therefore, further optimization of the prefabricated pier-to-cap socket-and-spigot joint design is needed to reduce the requirements for the cap or cap beam while ensuring the overall seismic performance of the joint.

[0004] In summary, optimizing the structure of prefabricated pier-cap node, reducing the overall hoisting weight of prefabricated pier columns, enhancing the construction convenience and overall economy of prefabricated pier-cap node, and improving the overall seismic performance of prefabricated pier-cap node are of great significance to the promotion and development of prefabricated pier structure system. Summary of the Invention

[0005] In order to solve the problems existing in the connection of the prefabricated pier-pedestal node structure proposed in the background technology, the present invention proposes a reinforced concrete prefabricated hollow pier-pedestal node structure and its construction method, which are used to solve the problems of the overall weight of the prefabricated pier column, the convenience of construction and the overall economy as well as the overall seismic performance.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A reinforced concrete prefabricated hollow bridge pier-cap joint structure, the joint structure mainly consisting of a prefabricated hollow pier column, a pier column outer steel plate, a replaceable L-shaped energy dissipation device, a cap, UHPC grouting material, a slotted steel cage, and slightly expansive core-filled concrete; The prefabricated hollow pier column includes pier column longitudinal reinforcement and pier column stirrups cast together with concrete; the pier column longitudinal reinforcement and pier column stirrups are tied together to form a pier column steel cage and placed at the designed position, and the pier column outer steel plate is provided at the bottom of the prefabricated hollow pier column; the pier column outer steel plate is provided with a shear key on one side in contact with the prefabricated hollow pier column, and a connecting bolt for installing a replaceable L-shaped energy dissipation device on the other side; by supporting formwork inside and outside the designed position of the prefabricated hollow pier column, the pier column longitudinal reinforcement, pier column stirrups and pier column outer steel plate are cast as a whole, and the pier column hollow layer is formed inside the prefabricated hollow pier column; The replaceable L-shaped energy dissipation device includes an L-shaped energy dissipation steel plate and connecting bolts; the L-shaped energy dissipation steel plate is placed at the designed position at the bottom of the prefabricated hollow pier, and the L-shaped energy dissipation steel plate is connected to the pier outer steel plate and the bottom base by connecting bolts, so as to realize the coordinated work of the replaceable L-shaped energy dissipation device with the pier and the base, thereby enhancing the energy dissipation capacity of the prefabricated pier; The cap is arranged at the bottom of the prefabricated hollow pier column, and includes a socket and a socket reinforcement cage; the socket reinforcement cage is arranged inside the socket at the center of the cap, and the upper end extends outward from the socket. The bottom of the prefabricated hollow pier column is assembled into the socket, and the socket reinforcement cage extends into the hollow layer of the pier column and is poured with micro-expansion core-filling concrete, thereby casting the socket reinforcement cage as a whole; in addition, UHPC grouting material is also poured between the cap socket and the bottom of the prefabricated hollow pier column to form an effective anchoring for the prefabricated hollow pier column.

[0007] Furthermore, the yield strength of the pier column longitudinal reinforcement and the pier column stirrups is not less than 400 MPa, and effective binding is formed between the pier column longitudinal reinforcement and the pier column stirrups.

[0008] Furthermore, the yield strength of the pier column outer steel plate is not less than 345MPa, and a plurality of shear keys are densely distributed on the side where the pier column outer steel plate contacts the prefabricated hollow pier column to ensure that the pier column outer steel plate and the prefabricated hollow pier column are effectively bonded together and work together.

[0009] Furthermore, in the replaceable L-shaped energy dissipation device, the yield strength of the L-shaped energy dissipation steel plate is 235 MPa, so as to give full play to its deformation energy dissipation capacity.

[0010] Furthermore, the connecting bolts need to effectively and reliably connect the replaceable L-shaped energy dissipation device to the prefabricated hollow pier and the pedestal respectively, so as to ensure that the replaceable L-shaped energy dissipation device works in coordination with the prefabricated hollow pier and the pedestal, thereby enhancing the energy dissipation capacity of the prefabricated hollow pier.

[0011] Furthermore, the compressive strength of the UHPC grouting material in the socket is not less than 120 MPa.

[0012] Furthermore, a foundation protrusion is provided on the top of the foundation, and the L-shaped energy-absorbing steel plate is fixed on the foundation protrusion by connecting bolts.

[0013] Furthermore, a plurality of groups of shear keys are extended into and tied into the steel cage, and the longitudinal reinforcement at the bottom of the slot steel cage is horizontally extended outward into the base.

[0014] Furthermore, the cross-sections of the prefabricated hollow pier and the foundation are square or circular, the pier is covered with steel plates, and the replaceable L-shaped energy dissipation devices are symmetrically arranged around the prefabricated hollow pier.

[0015] The construction method of the reinforced concrete prefabricated hollow pier-cap node structure comprises the following steps: S1. Tie the pier column longitudinal reinforcement and pier column stirrups to form a pier column reinforcement cage and place it in the designed position; S2. Install a pier column outer steel plate at the bottom of the pier column reinforcement cage. Shear keys are densely distributed on the side of the pier column outer steel plate in contact with the prefabricated hollow pier column, and a replaceable L-shaped energy dissipation device is installed on the other side via connecting bolts. Then, the inner and outer formwork of the prefabricated hollow pier column are respectively installed. The pier column longitudinal reinforcement, pier column stirrups, and pier column outer steel plate are cast as a whole to form the prefabricated pier column hollow layer. Simultaneously, the concrete is vibrated and cured accordingly. S3. Tie the cap reinforcement cage and install and embed the connecting bolts and slot reinforcement cage connected to the replaceable L-shaped energy dissipation device in the cap. Then, erect the cap formwork and pour concrete, while performing corresponding vibration and curing. S4. After the concrete pouring and curing of the cap and prefabricated hollow pier are completed, the prefabricated hollow pier is assembled to the designated position of the socket of the cap, and UHPC grouting material is poured into the socket; S5. Use connecting bolts to connect the replaceable L-shaped energy dissipation device to the prefabricated hollow pier and the cap, respectively, to achieve coordinated operation of the replaceable L-shaped energy dissipation device, the pier, and the cap; S6. Pour a certain amount of slightly expansive concrete into the hollow layer of the pier column, cast the slot reinforcement cage in the socket into a whole, and make the casting height flush with the top surface of the abutment, thereby completing the production and assembly of the reinforced concrete prefabricated hollow pier-abutment node.

[0016] Compared with the prior art, the implementation of the present invention can achieve the following significant effects: The present invention proposes a reinforced concrete assembled hollow pier-cap node structure. On the premise of realizing the prefabrication and assembly of the pier-cap node, a hollow layer is set in the cross section of the prefabricated pier, which significantly reduces the overall weight of the prefabricated pier. At the same time, the socket section structure of the pier is optimized, and a slot steel cage is set in the cap to achieve a shallow socket connection between the pier and the cap, reducing the requirements for the cap structure of the node using the socket connection and ensuring that the pier-cap node is reliably connected. A replaceable L-shaped energy dissipation device is set at the bottom of the prefabricated pier to enhance the energy dissipation capacity of the pier-cap node under seismic loads, thereby improving the overall seismic performance of the node. Since the pier and the cap in the pier-cap node are both prefabricated in the factory, and at the same time, a hollow layer is set inside the prefabricated pier, while giving full play to the advantages of the fast construction speed of the prefabricated assembly structure, the overall weight of the pier is significantly reduced, and the requirements for the lifting equipment during the assembly process are reduced, which is conducive to further improving the overall economic and environmental benefits of the prefabricated pier-cap node. The specific beneficial effects are as follows: 1. The present invention is aimed at the pier-cap node, and adopts prefabrication and assembly technology to realize the prefabrication production of the pier and the cap in the node respectively. At the same time, a hollow layer is set inside the prefabricated pier, which significantly reduces the overall lifting weight of the prefabricated pier, significantly reduces the manpower, material and financial resources consumed in the assembly process of the prefabricated pier, and improves the economic and environmental benefits of the pier-cap node.

[0017] 2. To enhance the energy dissipation capacity of the prefabricated pier-cap joint under seismic loads and ensure the joint's overall seismic performance, a replaceable L-shaped energy dissipation device is installed at the base of the prefabricated pier. This device, consisting of an energy-absorbing steel plate and corresponding mounting bolts, is placed at the designed location at the base of the pier and bolted to the pier and cap. This allows the device to work in tandem with the pier and cap, thereby enhancing the pier's energy dissipation capacity.

[0018] 3. In the precast pier-cap joint, a slotted reinforcement cage is embedded within the cap. Once the precast pier is assembled into its designated position, UHPC grouting material and a certain amount of slightly expansive concrete are poured into the sockets, creating a secure connection between the precast pier and the cap and enhancing the bending and shear resistance of the pier's spigot section. The slotted reinforcement cage effectively reduces the length of the pier's spigot section, achieving an effective shallow spigot connection, further reducing the requirements for the cap, and ultimately improving the overall economic benefits of the precast pier-cap joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic elevation view of the entire invention.

[0020] Figure 2 This invention Figure 1 AA cross-section diagram.

[0021] Figure 3 It is a three-dimensional schematic diagram of the present invention.

[0022] Figure 4 It is a construction and production flow chart of the present invention.

[0023] Reference numerals: 1- Prefabricated hollow pier; 2- Hollow layer of pier; 3- Longitudinal reinforcement of pier; 4- Stirrups of pier; 5- Reserved anchor rods of outer steel plate; 6- Outer steel plate of pier; 7- L-shaped energy-absorbing steel plate; 8- Replaceable L-shaped energy-absorbing device; 9- Connecting bolts; 10- Cap; 11- UHPC grouting material; 12- Cap slot; 13- Steel cage of cap slot; 14- Micro-expansion core-filling concrete. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-4 The present invention will be further described in detail with specific implementations to facilitate a clear understanding of the present invention, but they do not constitute a limitation to the present invention.

[0025] Example 1 like Figure 1 As shown in the figure, the reinforced concrete assembled hollow bridge pier-cap node structure of the present invention mainly consists of a prefabricated hollow pier column 1, a pier column outer steel plate 6, a replaceable L-shaped energy dissipation device 8, a cap 10, UHPC grouting material 11, a slot steel cage 13 and a micro-expansion core filling concrete 14. Figure 2-3 As shown, the cross-sections of the prefabricated hollow pier 1 and the cap 10 are square, the pier is covered with steel plates 6, and the replaceable L-shaped energy dissipation devices 8 are symmetrically arranged around the prefabricated hollow pier 1.

[0026] like Figure 1-3 As shown, the prefabricated hollow pier 1 includes pier longitudinal reinforcement 3 and pier stirrups 4 cast together with the concrete. The pier longitudinal reinforcement 3 and pier stirrups 4 are tied together to form a pier reinforcement cage and placed at the designed position. A pier outer steel plate 6 is provided at the bottom of the prefabricated hollow pier 1. The pier outer steel plate 6 is provided with a shear key 5 on the side in contact with the prefabricated hollow pier 1, and a connecting bolt 9 for installing a replaceable L-shaped energy dissipation device 8 on the other side. By supporting formwork inside and outside the designed position of the prefabricated hollow pier 1, the pier longitudinal reinforcement 3, pier stirrups 4, and pier outer steel plate 6 are cast as a whole, and a pier hollow layer 2 is formed inside the prefabricated hollow pier 1.

[0027] In this embodiment, Figure 1As shown, the replaceable L-shaped energy dissipation device 8 includes an L-shaped energy dissipation steel plate 7 and connecting bolts 9. The L-shaped energy dissipation steel plate 7 is placed at the designed position at the bottom of the prefabricated hollow pier 1. The connecting bolts 9 are used to connect the L-shaped energy dissipation steel plate 7 to the pier outer steel plate 6 and the bottom base 10, respectively, to achieve the coordinated work of the replaceable L-shaped energy dissipation device 8 with the pier 1 and the base 10, thereby enhancing the energy dissipation capacity of the prefabricated pier 1. The connecting bolts 9 are required to effectively and reliably connect the replaceable L-shaped energy dissipation device 8 with the prefabricated hollow pier 1 and the base 10, respectively, to ensure that the replaceable L-shaped energy dissipation device 8 works in coordination with the prefabricated hollow pier 1 and the base 10, thereby enhancing the energy dissipation capacity of the prefabricated hollow pier 1.

[0028] like Figure 1 As shown, the cap 10 is arranged at the bottom of the prefabricated hollow pier 1 and includes a socket 12 and a socket reinforcement cage 13. The socket reinforcement cage 13 is arranged inside the socket 12 at the center of the cap 10, with its upper end extending outward from the socket 12. The longitudinal reinforcement at the bottom of the socket reinforcement cage 13 extends horizontally into the cap 10. The bottom of the prefabricated hollow pier 1 is assembled into the socket 12, and the socket reinforcement cage 13 extends into the hollow layer 2 of the pier. Micro-expansion core-filled concrete 14 is poured, thereby casting the socket reinforcement cage 13 as a whole. In addition, UHPC grouting material 11 is poured between the cap socket 12 and the bottom of the prefabricated hollow pier 1 to effectively anchor the prefabricated hollow pier 1.

[0029] In this embodiment, the yield strength of the pier column longitudinal reinforcement 3 and the pier column stirrups 4 is 500MPa, and an effective binding is formed between the pier column longitudinal reinforcement 3 and the pier column stirrups 4. The yield strength of the pier column outer steel plate 6 is not less than 345MPa, and the side of the pier column outer steel plate 6 in contact with the prefabricated hollow pier column 1 is densely covered with multiple shear keys 5. Multiple groups of shear keys 5 are extended into and tied into the steel cage, with a total of 11 layers, 28 keys per layer, to ensure that the pier column outer steel plate 6 and the prefabricated hollow pier column 1 are effectively bonded together and work together. In addition, in the replaceable L-shaped energy dissipation device 8, the yield strength of the L-shaped energy dissipation steel plate 7 is 235MPa to give full play to its deformation energy dissipation capacity. The compressive strength of the UHPC grouting material 11 in the socket 12 is not less than 120MPa.

[0030] Example 2 In this embodiment, a base protrusion is provided on the top of the base 10, and the L-shaped energy dissipation steel plate 7 is fixed to the base protrusion by connecting bolts 9. Other structures and connection methods are the same as those in embodiment 1 and will not be described in detail here.

[0031] Example 3 In this embodiment, the prefabricated hollow pier 1 and the cap 10 have circular cross-sections, the pier is covered with steel plates 6, and replaceable L-shaped energy dissipation devices 8 are symmetrically arranged around the prefabricated hollow pier 1. Other structures and connection methods are the same as those in Example 1 or Example 2 and will not be described in detail here.

[0032] Example 4 The construction method of the reinforced concrete assembled hollow pier-cap node structure of the above embodiments 1-3 is as follows: Figure 4 As shown, the following steps are included: S1. Tie the pier column longitudinal reinforcement 3 and the pier column stirrups 4 to form a pier column reinforcement cage, and place it at the designed position.

[0033] S2. A pier column outer steel plate 6 is set at the bottom of the pier column reinforcement cage, and the shear keys 5 are densely distributed on the side of the pier column outer steel plate 6 in contact with the prefabricated hollow pier column 1, and a replaceable L-shaped energy dissipation device 8 is installed on the other side through connecting bolts 9. Then, the inner and outer formwork of the prefabricated hollow pier column are respectively set, and the pier column longitudinal reinforcement 3, pier column stirrups 4 and the pier column outer steel plate 6 are cast into one body to form the prefabricated pier column hollow layer 2, and the concrete is vibrated and cured accordingly.

[0034] S3. Tie up the cap reinforcement cage, and respectively set and embed the connecting bolts 9 and the slot reinforcement cage 13 connected to the replaceable L-shaped energy dissipation device 8 in the cap 10, and then respectively support the cap formwork and pour concrete, while performing corresponding vibration and curing.

[0035] S4. After the concrete pouring and curing of the cap 10 and the prefabricated hollow pier 1 are completed, the prefabricated hollow pier 1 is assembled to the designated position of the socket 12 of the cap, and UHPC grouting material 11 is poured into the socket 12.

[0036] S5. Use connecting bolts 9 to connect the replaceable L-shaped energy dissipation device 8 to the prefabricated hollow pier 1 and the cap 10 respectively, so as to achieve coordinated work among the replaceable L-shaped energy dissipation device 8, the pier 1 and the cap 10.

[0037] S6. Pour a certain amount of slightly expansive concrete 14 into the hollow layer 2 of the pier column, and cast the slot reinforcement cage 13 in the socket 12 into a whole. The casting height is flush with the top surface of the platform 10, thereby completing the production and assembly of the reinforced concrete prefabricated hollow pier-platform node.

[0038] The above is merely a preferred embodiment of the present invention and does not constitute any formal limitation on the structure of the present invention. The layout and number of the present invention are not limited to this example and can be optimized according to actual engineering practices. Any modifications, equivalent changes, and decorations to the above embodiment based on the technical principles of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A reinforced concrete prefabricated hollow pier-cap joint structure, characterized by: The node structure mainly consists of a prefabricated hollow pier (1), a pier outer steel plate (6), a replaceable L-shaped energy dissipation device (8), a cap (10), a UHPC grouting material (11), a slotted steel cage (13) and a micro-expansion core-filling concrete (14); The prefabricated hollow pier (1) comprises pier longitudinal reinforcement (3) and pier stirrups (4) cast together with concrete; the pier longitudinal reinforcement (3) and pier stirrups (4) are tied together to form a pier reinforcement cage and placed at a designed position, and the pier outer steel plate (6) is provided at the bottom of the prefabricated hollow pier (1); a shear key (5) is provided on one side of the pier outer steel plate (6) in contact with the prefabricated hollow pier (1), and a connecting bolt (9) for installing a replaceable L-shaped energy dissipation device (8) is provided on the other side; by supporting formwork inside and outside the designed position of the prefabricated hollow pier (1), the pier longitudinal reinforcement (3), the pier stirrups (4) and the pier outer steel plate (6) are cast into a whole, and at the same time, the pier hollow layer (2) is formed inside the prefabricated hollow pier (1); The replaceable L-shaped energy dissipation device (8) comprises an L-shaped energy dissipation steel plate (7) and a connecting bolt (9); the L-shaped energy dissipation steel plate (7) is placed at a designed position at the bottom of the prefabricated hollow pier (1), and the L-shaped energy dissipation steel plate (7) is connected to the pier outer steel plate (6) and the bottom bearing platform (10) respectively by using the connecting bolt (9), so as to realize the coordinated work of the replaceable L-shaped energy dissipation device (8) with the pier (1) and the bearing platform (10), thereby enhancing the energy dissipation capacity of the prefabricated pier (1); The pedestal (10) is arranged at the bottom of the prefabricated hollow pier (1), and includes a socket (12) and a socket reinforcement cage (13); the socket reinforcement cage (13) is arranged inside the socket (12) at the center of the pedestal (10), and the upper end extends outward from the socket (12); the bottom of the prefabricated hollow pier (1) is assembled into the socket (12), and the socket reinforcement cage (13) extends into the hollow layer (2) of the pier, and is poured with micro-expansion core-filling concrete (14), thereby casting the socket reinforcement cage (13) as a whole; in addition, UHPC grouting material (11) is also poured between the pedestal socket (12) and the bottom of the prefabricated hollow pier (1) to form an effective anchoring for the prefabricated hollow pier (1).

2. The reinforced concrete prefabricated hollow pier-cap joint structure according to claim 1, characterized in that: The yield strength of the pier column longitudinal reinforcement (3) and the pier column stirrup reinforcement (4) is not less than 400 MPa, and effective binding is formed between the pier column longitudinal reinforcement (3) and the pier column stirrup reinforcement (4).

3. The reinforced concrete prefabricated hollow pier-cap joint structure according to claim 1, characterized in that: The yield strength of the pier column outer steel plate (6) is not less than 345 MPa, and a plurality of shear keys (5) are densely distributed on the side where the pier column outer steel plate (6) contacts the prefabricated hollow pier column (1) to ensure that the pier column outer steel plate (6) and the prefabricated hollow pier column (1) are effectively bonded together and work together.

4. The reinforced concrete prefabricated hollow pier-cap joint structure according to claim 1, characterized in that: In the replaceable L-shaped energy dissipation device (8), the yield strength of the L-shaped energy dissipation steel plate (7) is 235 MPa, so as to fully exert its deformation energy dissipation capacity.

5. The reinforced concrete assembled hollow pier-cap joint structure according to claim 1, characterized in that: The connecting bolts (9) are required to effectively and reliably connect the replaceable L-shaped energy dissipation device (8) to the prefabricated hollow pier (1) and the pedestal (10), respectively, to ensure that the replaceable L-shaped energy dissipation device (8) works in coordination with the prefabricated hollow pier (1) and the pedestal (10), thereby enhancing the energy dissipation capacity of the prefabricated hollow pier (1).

6. The reinforced concrete prefabricated hollow pier-cap joint structure according to claim 1, characterized in that: The compressive strength of the UHPC grouting material (11) in the socket (12) is not less than 120 MPa.

7. The reinforced concrete prefabricated hollow pier-cap joint structure according to claim 1, characterized in that: A bearing platform protrusion is provided on the top of the bearing platform (10), and the L-shaped energy-absorbing steel plate (7) is fixed on the bearing platform protrusion via connecting bolts (9).

8. The reinforced concrete prefabricated hollow pier-cap joint structure according to claim 1, characterized in that: A plurality of shear keys (5) are inserted into and tied in the steel cage, and the longitudinal reinforcement at the bottom of the slot steel cage (13) is horizontally extended outward into the bearing platform (10).

9. The reinforced concrete prefabricated hollow pier-cap joint structure according to claim 1, characterized in that: The cross-sections of the prefabricated hollow pier (1) and the bearing platform (10) are square or circular, the pier is covered with a steel plate (6), and a replaceable L-shaped energy dissipation device (8) is symmetrically arranged around the prefabricated hollow pier (1).

10. A construction method for a reinforced concrete assembled hollow pier-cap node structure according to claim 1, characterized in that: The steps include: S1, tying the pier column longitudinal reinforcement (3) and the pier column stirrups (4) to form a pier column reinforcement cage, and placing it at the designed position; S2. A pier column outer steel plate (6) is provided at the bottom of the pier column reinforcement cage, and a shear key (5) is densely distributed on one side of the pier column outer steel plate (6) in contact with the prefabricated hollow pier column (1), and a replaceable L-shaped energy dissipation device (8) is installed on the other side through a connecting bolt (9), and then the inner and outer formwork of the prefabricated hollow pier column are respectively provided, and the pier column longitudinal reinforcement (3), the pier column stirrups (4) and the pier column outer steel plate (6) are cast into one body to form a prefabricated pier column hollow layer (2), and the concrete is vibrated and cured accordingly at the same time; S3, tying the cap steel cage, and respectively setting and pre-embedding the connecting bolts (9) and the slot steel cage (13) connected to the replaceable L-shaped energy dissipation device (8) in the cap (10), and then respectively supporting the cap formwork, and pouring concrete, while performing corresponding vibration and curing; S4, after the concrete pouring and curing of the cap (10) and the prefabricated hollow pier (1) are completed, the prefabricated hollow pier (1) is assembled to the designated position of the socket (12) of the cap, and UHPC grouting material (11) is poured into the socket (12); S5. Using connecting bolts (9), the replaceable L-shaped energy dissipation device (8) is connected to the prefabricated hollow pier (1) and the pedestal (10), respectively, to achieve coordinated operation of the replaceable L-shaped energy dissipation device (8), the pier (1) and the pedestal (10); S6. Pour a certain amount of micro-expansive concrete (14) into the hollow layer (2) of the pier column, and cast the slot reinforcement cage (13) in the socket (12) into a whole. The casting height is flush with the top surface of the platform (10), thereby completing the production and assembly of the reinforced concrete assembled hollow bridge pier-platform node.

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