Prefabricated reinforced concrete beam-column joint and construction method thereof

Abstract

The application belongs to the technical field of building construction and relates to a fabricated reinforced concrete beam-column joint and a construction method thereof. Two second prefabricated frame beams and two first prefabricated frame beams are symmetrically arranged and located above a frame column. The top of the frame column is provided with a plurality of column longitudinal reinforcements, which are located at the four corners of the frame column. Mounting assemblies are arranged between the first and second prefabricated frame beams and the frame column. The end of the first and second prefabricated frame beams close to each other is provided with a connecting assembly for connecting the first and second prefabricated frame beams. The top of the frame column is provided with four first mounting grooves, and the inside of the first mounting grooves is provided with a fixing assembly for fixing a steel corbel. The application solves the problem that the existing frame column and prefabricated frame beam are only connected through bolts when the steel corbel and the bolt are connected with the frame column, and the connection is not stable enough.

Description

A prefabricated reinforced concrete beam-column joint and its construction method Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a prefabricated reinforced concrete beam-column joint and its construction method. Background Technology

[0002] Industrialized construction is the development direction and trend of the construction industry. For prefabricated concrete structures, factory processing and production, on-site modular assembly, and connection operations eliminate a large amount of on-site wet work, promoting the industrialization level of on-site construction. However, currently, prefabricated structure construction sites still require the erection of tall formwork support systems, resulting in high material consumption, very expensive construction measures, and long construction cycles. How to leverage the inherent advantages of prefabricated structures, reduce on-site operational difficulties, and decrease the amount of on-site support scaffolding is crucial for advancing the process of industrialized construction.

[0003] A search revealed that invention patent CN112376690A discloses a beam-column joint for a supportless horizontal precast floor slab and its construction method. The beam-column joint includes a frame column, with longitudinal reinforcement concentrated at the corners of the frame column and extending into the beam-column joint area; a precast frame beam, with its ends extending into the beam-column joint area and bent to form hooks; and steel brackets installed on the sides of the frame column to support the precast frame beam. The construction method is as follows: pouring or installing the frame column and installing the steel brackets; then placing the precast frame beam on the steel brackets; partially extending the precast frame beam into the beam-column joint; then filling the void between the temporary finished surface of the frame column and the bottom surface of the precast frame beam with high-strength grout; installing stirrups in the joint area along the longitudinal reinforcement of the column and the bottom longitudinal reinforcement of the beam; and finally pouring joint concrete in the beam-column joint area. This invention enables supportless beam-column joints in a horizontal precast floor slab, improving construction speed and quality while reducing costs.

[0004] The beam-column joint still has the following defects when in use:

[0005] 1. When connecting the frame columns to the precast frame beams, relying solely on steel brackets and bolts results in an unstable connection and a low safety factor.

[0006] 2. When steel brackets are connected to frame columns, they are only connected by bolts without any other auxiliary structures, resulting in an unstable connection.

[0007] To address the aforementioned issues, this invention proposes a prefabricated reinforced concrete beam-column joint and its construction method. Summary of the Invention

[0008] In view of this, in order to solve the problems in the prior art where the connection between frame columns and precast frame beams relies solely on steel brackets and bolts, resulting in an unstable connection and low safety factor, and where the connection between steel brackets and frame columns is solely through bolts without other auxiliary structures, the present invention provides a prefabricated reinforced concrete beam-column joint and its construction method.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A prefabricated reinforced concrete beam-column joint includes a frame column, two second prefabricated frame beams and two first prefabricated frame beams. The two second prefabricated frame beams and the two first prefabricated frame beams are symmetrically arranged and are all located above the frame column. The top of the frame column is provided with multiple longitudinal reinforcement bars, which are located at the four corners of the frame column. Installation components for installation are provided between the first and second prefabricated frame beams and the frame column.

[0011] Both the first precast frame beam and the second precast frame beam are provided with connecting components for connecting the first precast frame beam and the second precast frame beam at their respective ends that are close to each other.

[0012] The top of the frame column has four first mounting slots, and the inside of the first mounting slots is equipped with fixing components for fixing the steel brackets.

[0013] Furthermore, the installation components include four bolts threaded through the steel bracket. The four bolts are arranged in pairs, with one pair of bolts fixedly connected to the frame column and the other pair of bolts fixedly connected to the first precast frame beam and the second precast frame beam. Washers are provided on the bolts.

[0014] Furthermore, the connecting assembly includes a plurality of second L-shaped steel bars fixedly connected to one end of the first precast frame beam and a plurality of first L-shaped steel bars connected to one end of the second precast frame beam. The plurality of first L-shaped steel bars located at one end of the two second precast frame beams are staggered and used in conjunction with each other. The plurality of second L-shaped steel bars located at one end of the two first precast frame beams are staggered and used in conjunction with each other.

[0015] Furthermore, the fixing component includes a horizontal plate that is slidably connected to the inner wall of the first mounting groove, two symmetrically arranged second clamping plates that are fixedly connected to the bottom of the horizontal plate, and push plates that cooperate with the horizontal plate that are fixedly connected to the bottom of both the first precast frame beam and the second precast frame beam.

[0016] Furthermore, a fixing block is fixedly connected to one side of the steel bracket, and a second slot is provided on both sides of the fixing block. A second mounting slot that cooperates with the fixing block is provided around the frame column. The second mounting slot is connected to the first mounting slot, and the second slot engages with the second mounting plate.

[0017] Furthermore, a first connecting block is fixedly connected to one end of the second precast frame beam, and a plurality of first arc-shaped grooves are provided on one side of the first connecting block. The first arc-shaped grooves are used in conjunction with the first L-shaped steel bars. A second connecting block is fixedly connected to one end of the first precast frame beam, and a plurality of second arc-shaped grooves are provided on one side of the second connecting block. The second arc-shaped grooves are used in conjunction with the second L-shaped steel bars.

[0018] Furthermore, a first slot is provided on one side of the first connecting block, and a first card plate is fixedly connected to one side of the first precast frame beam, with the first card plate engaging with the first slot.

[0019] This invention also proposes a construction method for prefabricated reinforced concrete beam-column joints, comprising the following steps:

[0020] S1: Cast or install the frame column, and install the steel bracket when it meets the design conditions. First, insert the four fixing blocks into the second installation groove, and use bolts and washers to fix the steel bracket to the frame column.

[0021] S2. Place the second precast frame beam on the steel bracket, with part of the second precast frame beam extending into the beam-column joint area. At this time, multiple first L-shaped steel bars are staggered, and the first L-shaped steel bars cooperate with the corresponding first arc-shaped grooves. At this time, the push plate at the bottom of the second precast frame beam is inserted into the interior of the first mounting groove. The push plate pushes the horizontal plate to move vertically downward, and the horizontal plate drives the second clamping plate to move vertically downward. The second clamping plate is inserted into the interior of the second clamping groove. At this time, the second clamping plate and the second clamping groove are engaged, which improves the stability of the connection between the steel bracket and the frame column. At the same time, the push plate is engaged with the first mounting groove, which can improve the stability of the connection between the frame column and the second precast frame beam. The second precast frame beam is fixed on the steel bracket using bolts and washers.

[0022] S3. The first precast frame beam is placed on the steel bracket and the first precast frame beam extends into the beam-column joint area. At this time, the first precast frame beam is inserted into the device from top to bottom, so that the first card plate is inserted into the corresponding first card slot, which improves the stability of the connection between the first precast frame beam and the second precast frame beam. At the same time, the push plate at the bottom of the first precast frame beam pushes the corresponding first mounting slot, which can improve the stability of the connection between the first precast frame beam and the frame column. The second precast frame beam is fixed on the steel bracket using bolts and washers.

[0023] S4. High-strength grouting material is used to fill the frame columns. Stirrups are installed between the longitudinal steel bars, the second L-shaped steel bars and the first L-shaped steel bars of the column to form irregularly shaped combined stirrups that ensure the seismic performance of the joint area. Joint concrete is poured in the beam-column joint area.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. The prefabricated reinforced concrete beam-column joint disclosed in this invention involves placing a second precast frame beam on a steel bracket, with a portion of the second precast frame beam extending into the beam-column joint area. At this time, multiple first L-shaped reinforcing bars are staggered, and the first L-shaped reinforcing bars cooperate with the corresponding first arc-shaped grooves. The push plate at the bottom of the second precast frame beam is inserted into the interior of the first mounting groove. The push plate pushes the horizontal plate to move vertically downward, and the horizontal plate drives the second clamping plate to move vertically downward. The second clamping plate is inserted into the interior of the second clamping groove. At this time, the second clamping plate and the second clamping groove engage, improving the stability of the connection between the steel bracket and the frame column. At the same time, the push plate engages with the first mounting groove, which can improve the stability of the connection between the frame column and the second precast frame beam. The second precast frame beam is fixed to the steel bracket using bolts and washers.

[0026] 2. The prefabricated reinforced concrete beam-column joint disclosed in this invention involves placing a first prefabricated frame beam on a steel bracket with a portion of the first prefabricated frame beam extending into the beam-column joint area. At this time, the first prefabricated frame beam is inserted into the device from top to bottom, thereby causing the first clamping plate to insert into the corresponding first clamping slot, which improves the stability of the connection between the first prefabricated frame beam and the second prefabricated frame beam. Simultaneously, the pushing plate at the bottom of the first prefabricated frame beam pushes the corresponding first mounting slot, which further improves the stability of the connection between the first prefabricated frame beam and the frame column. The second prefabricated frame beam is fixed to the steel bracket using bolts and washers.

[0027] 3. The prefabricated reinforced concrete beam-column joint disclosed in this invention uses high-strength grout to fill the frame column, and installs joint domain stirrups between the longitudinal reinforcement, the second L-shaped reinforcement and the first L-shaped reinforcement of the column to form irregularly shaped combined stirrups that ensure the seismic performance of the joint domain, and pours joint concrete in the beam-column joint area.

[0028] 4. The prefabricated reinforced concrete beam-column joint disclosed in this invention can ensure the stability of the first L-shaped steel bar and the second L-shaped steel bar by setting multiple first arc-shaped grooves and second arc-shaped grooves. At the same time, the stability of the connection between the steel bracket and the frame column can be improved by inserting the second clamping plate into the second clamping groove. The stability of the connection between the first prefabricated frame beam and the second prefabricated frame beam can be improved by inserting the first clamping plate into the corresponding first clamping groove.

[0029] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0031] Figure 1 is a three-dimensional structural schematic diagram of a prefabricated reinforced concrete beam-column joint according to the present invention;

[0032] Figure 2 is an exploded structural diagram of a prefabricated reinforced concrete beam-column joint according to the present invention;

[0033] Figure 3 is a structural schematic diagram of the second precast frame beam in a precast reinforced concrete beam-column joint according to the present invention.

[0034] Figure 4 is a structural schematic diagram of the first precast frame beam in a precast reinforced concrete beam-column joint according to the present invention.

[0035] Figure 5 is a structural schematic diagram of the frame column in a prefabricated reinforced concrete beam-column joint according to the present invention;

[0036] Figure 6 is a schematic diagram of the structure of the second card plate and the second card slot in a prefabricated reinforced concrete beam-column joint according to the present invention.

[0037] Figure label:

[0038] 1. Frame column; 2. Steel bracket; 3. First precast frame beam; 4. Second precast frame beam; 5. Longitudinal reinforcement of column; 6. First connecting block; 7. First L-shaped reinforcement; 8. Bolt; 9. Second L-shaped reinforcement; 10. Second connecting block; 11. First arc groove; 12. First slot; 13. First plate; 14. Push plate; 15. Second arc groove; 16. First mounting groove; 17. Shim; 18. Second slot; 19. Fixing block; 20. Horizontal plate; 21. Second plate; 22. Second mounting groove. Detailed Implementation

[0039] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0041] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0042] Referring to Figures 1-6, a prefabricated reinforced concrete beam-column joint and its construction method include a frame column 1, two second prefabricated frame beams 4, and two first prefabricated frame beams 3. The two second prefabricated frame beams 4 and the two first prefabricated frame beams 3 are symmetrically arranged and located above the frame column 1. The top of the frame column 1 is provided with multiple longitudinal column bars 5, which are located at the four corners of the frame column 1. The first prefabricated frame beams 3 and the second prefabricated frame beams 4 are provided with installation components for installing the corresponding first prefabricated frame beams 3 and second prefabricated frame beams 4 between the frame column 1 and the first prefabricated frame beams 3 and second prefabricated frame beams 4. The installation components include four bolts 8 threaded through the steel bracket 2. The four bolts 8 are arranged in pairs. One set of bolts 8 is fixedly connected to the frame column 1, and the other set of bolts 8 is fixedly connected to the first prefabricated frame beams 3 and second prefabricated frame beams 4. Washers 17 are provided on the bolts 8. The steel bracket 2 is fixed to the frame column 1 by the bolts 8 and the washers 17.

[0043] Both the first precast frame beam 3 and the second precast frame beam 4 have connecting components at their adjacent ends for connecting the first precast frame beam 3 and the second precast frame beam 4. The connecting components include multiple second L-shaped steel bars 9 fixedly connected to one end of the first precast frame beam 3 and multiple first L-shaped steel bars 7 fixedly connected to one end of the second precast frame beam 4. The multiple first L-shaped steel bars 7 located at one end of the two second precast frame beams 4 are staggered and used in conjunction, and the multiple second L-shaped steel bars 9 located at one end of the two first precast frame beams 3 are staggered and used in conjunction. One end of the frame beam 4 is fixedly connected to a first connecting block 6. A plurality of first arc-shaped grooves 11 are provided on one side of the first connecting block 6. The first arc-shaped grooves 11 are used in conjunction with the first L-shaped steel bars 7. One end of the first precast frame beam 3 is fixedly connected to a second connecting block 10. A plurality of second arc-shaped grooves 15 are provided on one side of the second connecting block 10. The second arc-shaped grooves 15 are used in conjunction with the second L-shaped steel bars 9. A first slot 12 is provided on one side of the first connecting block 6. A first card plate 13 is fixedly connected to one side of the first precast frame beam 3. The first card plate 13 engages with the first slot 12.

[0044] Four first mounting slots 16 are provided on the top of the frame column 1. The first mounting slot 16 is provided with a fixing component for fixing the steel bracket 2. The fixing component includes a horizontal plate 20 that is slidably connected to the inner wall of the first mounting slot 16. Two symmetrically arranged second clamping plates 21 are fixedly connected to the bottom of the horizontal plate 20. The bottom of the first precast frame beam 3 and the second precast frame beam 4 are both fixedly connected with a push plate 14 that cooperates with the horizontal plate 20. A fixing block 19 is fixedly connected to one side of the steel bracket 2. The fixing block 19 has second clamping slots 18 on both sides. The frame column 1 has second mounting slots 22 that cooperate with the fixing block 19 on all four sides. The second mounting slots 22 are connected to the first mounting slots 16. The second clamping slots 18 are engaged with the second clamping plates 21.

[0045] A construction method for prefabricated reinforced concrete beam-column joints includes the following steps:

[0046] S1. Cast or install the frame column 1. When it meets the design conditions, install the steel bracket 2. First, insert the four fixing blocks 19 into the inside of the second mounting groove 22, and use bolts 8 and washers 17 to fix the steel bracket 2 to the frame column 1.

[0047] S2. The second precast frame beam 4 is placed on the steel bracket 2, and part of the second precast frame beam 4 extends into the beam-column joint area. At this time, multiple first L-shaped steel bars 7 are staggered, and the first L-shaped steel bars 7 cooperate with the corresponding first arc groove 11. At this time, the push plate 14 at the bottom of the second precast frame beam 4 is inserted into the interior of the first mounting groove 16. The push plate 14 pushes the horizontal plate 20 to move vertically downward. The horizontal plate 20 drives the second clamping plate 21 to move vertically downward. The second clamping plate 21 is inserted into the interior of the second clamping groove 18. At this time, the second clamping plate 21 and the second clamping groove 18 are engaged, which improves the stability of the connection between the steel bracket 2 and the frame column 1. At the same time, the push plate 14 is engaged with the first mounting groove 16, which can improve the stability of the connection between the frame column 1 and the second precast frame beam 4. The second precast frame beam 4 is fixed on the steel bracket 2 using bolts 8 and washers 17.

[0048] S3. The first precast frame beam 3 is placed on the steel bracket 2 and part of the first precast frame beam 3 extends into the beam-column joint area. At this time, the first precast frame beam 3 is inserted into the device from top to bottom, so that the first clamping plate 13 is inserted into the corresponding first clamping slot 12, which improves the stability of the connection between the first precast frame beam 3 and the second precast frame beam 4. At the same time, the pushing plate 14 at the bottom of the first precast frame beam 3 pushes the corresponding first mounting slot 16, which can improve the stability of the connection between the first precast frame beam 3 and the frame column 1. The second precast frame beam 4 is fixed on the steel bracket 2 using bolts 8 and washers 17.

[0049] S4. High-strength grouting material is used to fill the frame column 1. Stirrups are installed between the longitudinal steel bar 5, the second L-shaped steel bar 9 and the first L-shaped steel bar 7 to form a special-shaped combination stirrup to ensure the seismic performance of the joint area. Node concrete is poured in the beam-column joint area.

[0050] However, as is well known to those skilled in the art, the working principle and wiring method of the hydraulic cylinder 22 are commonplace and are all conventional means or common knowledge, so they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A prefabricated reinforced concrete beam-column joint, characterized in that, include: The frame column (1), two second precast frame beams (4) and two first precast frame beams (3) are arranged symmetrically and are all located above the frame column (1). The top of the frame column (1) is provided with multiple column longitudinal steel bars (5). The multiple column longitudinal steel bars (5) are located at the four corners of the frame column (1). The first precast frame beam (3) and the second precast frame beam (4) are provided with installation components for installation between them and the frame column (1). The ends of the first precast frame beam (3) and the second precast frame beam (4) that are close to each other are provided with connecting components for connecting the first precast frame beam (3) and the second precast frame beam (4). The top of the frame column (1) is provided with four first mounting slots (16). The inside of the first mounting slots (16) is provided with fixing components for fixing the steel brackets (2).

2. The prefabricated reinforced concrete beam-column joint according to claim 1, characterized in that, The installation assembly includes four bolts (8) threaded through the steel bracket (2). The four bolts (8) are in pairs. One pair of bolts (8) is fixedly connected to the frame column (1), and the other pair of bolts (8) is fixedly connected to the first precast frame beam (3) and the second precast frame beam (4). Washers (17) are provided on the bolts (8).

3. A prefabricated reinforced concrete beam-column joint according to claim 2, characterized in that, The connecting assembly includes a plurality of second L-shaped steel bars (9) fixedly connected to one end of the first precast frame beam (3) and a plurality of first L-shaped steel bars (7) connected to one end of the second precast frame beam (4). The plurality of first L-shaped steel bars (7) located at one end of the two second precast frame beams (4) are staggered and used in combination, and the plurality of second L-shaped steel bars (9) located at one end of the two first precast frame beams (3) are staggered and used in combination.

4. A prefabricated reinforced concrete beam-column joint according to claim 3, characterized in that, The fixing component includes a horizontal plate (20) that is slidably connected to the inner wall of the first mounting groove (16). Two second clamping plates (21) are fixedly connected to the bottom of the horizontal plate (20) and the bottom of the first precast frame beam (3) and the second precast frame beam (4) are both fixedly connected to a push plate (14) that works in conjunction with the horizontal plate (20).

5. A prefabricated reinforced concrete beam-column joint according to claim 4, characterized in that, A fixing block (19) is fixedly connected to one side of the steel bracket (2). A second slot (18) is provided on both sides of the fixing block (19). A second mounting slot (22) is provided around the frame column (1) to cooperate with the fixing block (19). The second mounting slot (22) is connected to the first mounting slot (16). The second slot (18) is engaged with the second mounting plate (21).

6. A prefabricated reinforced concrete beam-column joint according to claim 5, characterized in that, One end of the second precast frame beam (4) is fixedly connected to a first connecting block (6). A plurality of first arc grooves (11) are provided on one side of the first connecting block (6). The first arc grooves (11) are used in conjunction with the first L-shaped steel bars (7). One end of the first precast frame beam (3) is fixedly connected to a second connecting block (10). A plurality of second arc grooves (15) are provided on one side of the second connecting block (10). The second arc grooves (15) are used in conjunction with the second L-shaped steel bars (9).

7. A prefabricated reinforced concrete beam-column joint according to claim 6, characterized in that, The first connecting block (6) has a first slot (12) on one side, and the first precast frame beam (3) is fixedly connected to a first plate (13) on one side, and the first plate (13) engages with the first slot (12).

8. A construction method for a prefabricated reinforced concrete beam-column joint according to claim 7, characterized in that, Specifically, the following steps are included: S1. Cast or install the frame column (1). When it meets the design conditions, install the steel bracket (2). First, insert four fixing blocks (19) into the inside of the second installation groove (22), and use bolts (8) and washers (17) to fix the steel bracket (2) on the frame column (1); S2. Place the second precast frame beam (4) on the steel bracket (2) and the second precast frame beam (4) extends into the beam-column joint area. At this time, multiple first L-shaped steel bars (7) are staggered, and the first L-shaped steel bars (7) cooperate with the corresponding first arc groove (11). At this time, the push plate (14) at the bottom of the second precast frame beam (4) is inserted into the interior of the first mounting groove (16). The push plate (14) pushes the horizontal plate (20) to move vertically downward. The horizontal plate (20) drives the second clamping plate (21) to move vertically downward. The second clamping plate (21) is inserted into the interior of the second clamping groove (18). At this time, the second clamping plate (21) and the second clamping groove (18) are engaged, which improves the stability of the connection between the steel bracket (2) and the frame column (1). At the same time, the push plate (14) is engaged with the first mounting groove (16), which can improve the connection between the frame column (1) and the second precast frame beam (4). To ensure the stability of the connection between the frame beam (4), the second precast frame beam (4) is fixed to the steel bracket (2) using bolts (8) and washers (17); S3, the first precast frame beam (3) is placed on the steel bracket (2) and part of the first precast frame beam (3) extends into the beam-column joint area. At this time, the first precast frame beam (3) is inserted into the device from top to bottom, thereby allowing the first card plate (13) to be inserted into the corresponding first card slot (12), improving the stability of the connection between the first precast frame beam (3) and the second precast frame beam (4). At the same time, the first precast frame beam (3) The bottom push plate (14) pushes the corresponding first mounting groove (16), thereby improving the stability of the connection between the first precast frame beam (3) and the frame column (1). The first precast frame beam (3) is fixed on the steel bracket (2) using bolts (8) and washers (17). S4. The frame column (1) is filled with high-strength grout. The node domain stirrups are installed between the column longitudinal reinforcement (5), the second L-shaped reinforcement (9) and the first L-shaped reinforcement (7) to form a special-shaped combined stirrup to ensure the seismic performance of the node domain. The node concrete is poured in the beam-column node area.

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