Fabricated concrete beam-column joint structure and construction method thereof

Abstract

The fabricated concrete beam-column joint structure comprises a prefabricated column, a prefabricated superposed beam and a concrete bonding layer, a joint connecting area is arranged at the inflection point of the prefabricated column, an upper row of reserved hole channels and a lower row of reserved hole channels are horizontally formed in the joint connecting area, and a row of protruding stress ribs are arranged on the upper portion of the tail end of the prefabricated superposed beam; the tail ends of the stress bars are embedded in reserved hole channels in the upper portion of the joint connecting area, slurry anchor steel bars are pre-buried in reserved hole channels in the lower portion of the joint connecting area, a plurality of straight threaded sleeves are pre-buried in the lower portion of the tail end of the prefabricated superposed beam, and the slurry anchor steel bars are in threaded connection with the straight threaded sleeves. The node connecting area of the prefabricated column and the tail end of the prefabricated superposed beam are connected and fixed through a concrete bonding layer with the thickness smaller than or equal to 100 mm. The fabricated concrete beam-column joint is simple in structure, high in construction speed, low in manufacturing cost, excellent in anti-seismic effect and wide in application range.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete engineering structures and relates to an assembled concrete beam-column node structure and a construction method thereof. Background Art

[0002] As an efficient and environmentally friendly construction method, prefabricated buildings are increasingly attracting widespread attention. Prefabricated concrete frame structure is one of the main forms of prefabricated buildings. It breaks down the entire building into components such as beams, slabs, columns, and walls, and is characterized by standardized design, factory production, and prefabricated construction. It achieves a new type of building production method that achieves five energy savings and one environmental protection, as well as maximizes the value of the entire life cycle. In prefabricated concrete frame structures, beam-column nodes are key load-bearing and connection parts, and their construction quality directly affects the safety and durability of the overall structure. At present, the most commonly used connection in my country is the "wet" connection form of cast-in-place in the node area, which is divided into prefabricated beam bottom reinforcement anchor connection and additional steel bar lap connection. Although the existing prefabricated concrete beam-column node connection method has met the construction needs to a certain extent, there are still a series of technical problems and challenges.

[0003] Beam-column joints involve multiple components and connection methods, making them challenging to construct. This is especially true in areas with dense reinforcement. Ensuring that the reinforcement is gathered together, free of collision, and properly loaded is a primary challenge. When using cast-in-place concrete joints to create a single structure, the selection and reinforcement of formwork, as well as concrete placement, are key areas of on-site construction quality control and present significant challenges. The seismic performance of prefabricated buildings places extremely high demands on the connection method and construction quality of beam-column joints. Improving the seismic performance of these joints and ensuring the safety of the structure under seismic loads is a key challenge. Existing connection methods often suffer from inefficiency and high costs during construction. Technological innovation to reduce construction costs and improve efficiency is key to the development of prefabricated buildings. For example, the commonly used "wet" joint, while increasingly popular due to its "cast-in-place" properties, creates a structural weakness by creating an interface between new and old concrete. Furthermore, these joints present a long construction period, require a curing period for post-cast concrete, and overlap in the reinforcement joints, making them challenging to construct. Summary of the Invention

[0004] One object of the present invention is to provide an assembled concrete beam-column node structure, which solves the problem that the existing beam-column node connection structure is complex and difficult to construct.

[0005] Another object of the present invention is to provide a construction method for an assembled concrete beam-column node structure.

[0006] The first technical solution adopted by the present invention is an assembled concrete beam-column node structure, including a prefabricated column, a prefabricated composite beam and a concrete bonding layer. A node connection area is provided at the inflection point of the prefabricated column, and two rows of upper and lower reserved channels are horizontally provided in the node connection area. A row of protruding stress-bearing bars is provided at the upper part of the end of the prefabricated composite beam, and the end of the stress-bearing bar is embedded in the reserved channel at the upper part of the node connection area. Grout anchor steel bars are embedded in the reserved channel at the lower part of the node connection area. Several straight threaded sleeves are embedded at the lower part of the end of the prefabricated composite beam. The grout anchor steel bars are threadedly connected to the straight threaded sleeves. The node connection area of ​​the prefabricated column and the end of the prefabricated composite beam are connected and fixed by a concrete bonding layer with a thickness of ≤100mm.

[0007] The straight thread sleeves correspond one-to-one to the grout anchor steel bars, and the force-bearing bars correspond one-to-one to the reserved holes at the top of the node connection area.

[0008] Vertical reinforcement is arranged around the inside of the prefabricated column, and a number of transverse stirrups are arranged on the outside of the vertical reinforcement.

[0009] The vertical reinforcement on the left and right sides of the precast column is gate-type reinforcement, and the transverse stirrups are mouth-type stirrups.

[0010] The precast composite beam includes a precast beam at the bottom and a post-cast concrete layer at the top. The stress-bearing reinforcement is an L-shaped reinforcement, part of which is located in the post-cast concrete layer and part of which is located in the precast beam. The precast beam is provided with transverse reinforcement symmetrical with the stress-bearing reinforcement above and below, and a number of evenly distributed vertical stirrups I are provided on the outside of the stress-bearing reinforcement and the transverse reinforcement.

[0011] The straight thread sleeve is located on the end face of the precast beam and corresponds one-to-one to the stress reinforcement in the precast beam.

[0012] Vertical stirrups II are provided on the outside of the load-bearing bars and the straight threaded sleeve.

[0013] Vertical stirrups III are provided on the outside of the load-bearing bars and the grout anchor bars.

[0014] The second technical solution adopted by the present invention is a construction method for an assembled concrete beam-column node structure, which includes first hoisting the prefabricated column into place, positioning and fixing it, leaving the grouting anchor steel bars in the reserved channel at the lower part of the prefabricated column node connection area, and then hoisting the prefabricated beam so that the force-bearing bars are inserted into the reserved channel at the upper part of the prefabricated column node connection area, positioning the prefabricated beam and temporarily fixing it, effectively connecting the grouting anchor steel bars with the straight threaded sleeve embedded at the end of the prefabricated beam, and then pouring ultra-high performance concrete between the prefabricated column node connection area and the end of the prefabricated composite beam to form a concrete bonding layer, and finally pouring concrete on the top of the prefabricated beam to form a post-cast concrete layer to complete the assembly of the beam and column.

[0015] The diameter of the reserved channel at the lower part of the precast column node connection area is 2mm to 4mm larger than the diameter of the grouting anchor steel bar. During the process of pouring ultra-high performance concrete between the precast column node connection area and the end of the precast composite beam, the ultra-high performance concrete flows into the gap between the reserved channel and the grouting anchor steel bar and the stress-bearing reinforcement, thereby strengthening the connection strength between the reserved channel, the grouting anchor steel bar and the stress-bearing reinforcement.

[0016] The beneficial effect of the present invention is that by pouring ultra-high performance concrete between the prefabricated column node connection area and the end of the prefabricated composite beam to form a concrete bonding layer, an effective connection between the prefabricated component steel bars and concrete is achieved, thereby improving the overall performance of the beam-column node structure. The ultra-high performance concrete has self-compacting properties and can effectively fill the gaps in the beam-column node joints and slurry anchors. The new prefabricated concrete beam-column node has a simple structure, fast construction speed, low cost, excellent seismic resistance, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external structure of the assembled concrete beam-column node of the present invention; Figure 2 It is a schematic diagram of the internal structure of the prefabricated concrete beam-column node of the present invention.

[0018] In the figure, 1. Precast column, 2. Precast composite beam, 3. Concrete bonding layer, 4. Reserved channel, 5. Tension reinforcement, 6. Straight threaded sleeve, 7. Grout anchor steel bar, 8. Vertical reinforcement, 9. Transverse stirrups, 10. Precast beam, 11. Post-cast concrete layer, 12. Transverse reinforcement, 13. Vertical stirrup I, 14. Vertical stirrup II, 15. Vertical stirrup III. DETAILED DESCRIPTION

[0019] The following will be combined with the specific implementation methods and drawings of this application to clearly and completely describe the technical solution of this application. Obviously, the embodiments described here are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] Example 1 A prefabricated concrete beam-column joint structure, see Figure 1 and Figure 2, including a prefabricated column 1, a prefabricated composite beam 2 and a concrete bonding layer 3. A node connection area is provided at the inflection point of the prefabricated column 1, and two rows of upper and lower reserved channels 4 are horizontally provided in the node connection area. A row of protruding stress-bearing bars 5 are provided on the upper end of the prefabricated composite beam 2, and the ends of the stress-bearing bars 5 are embedded in the reserved channels 4 at the upper part of the node connection area. Grouting anchor steel bars 7 are pre-embedded in the reserved channels 4 at the lower part of the node connection area. Several straight threaded sleeves 6 are pre-embedded at the lower part of the end of the prefabricated composite beam 2, and the grouting anchor steel bars 7 are threadedly connected to the straight threaded sleeves 6. The node connection area of ​​the prefabricated column 1 and the end of the prefabricated composite beam 2 are connected and fixed by a concrete bonding layer 3 with a thickness of ≤100mm. By pouring the concrete bonding layer, the effective connection between the steel bars and concrete of the prefabricated component is realized, which improves the overall performance of the beam-column node structure. The ultra-high performance concrete has self-compacting properties and can effectively fill the gaps in the beam-column node joints and grouting anchors.

[0021] Example 2 A prefabricated concrete beam-column node structure comprises a prefabricated column 1, a prefabricated composite beam 2 and a concrete bonding layer 3. A node connection area is provided at the inflection point of the prefabricated column 1, and two rows of upper and lower reserved channels 4 are horizontally provided in the node connection area. In this embodiment, there are 8 reserved channels in the upper and lower rows, and they correspond one to one. A row of protruding stress reinforcement 5 is provided at the upper end of the prefabricated composite beam 2, and the end of the stress reinforcement 5 is embedded in the reserved channel 4 at the upper part of the node connection area. Grout anchor steel bars 7 are pre-embedded in the reserved channel 4 at the lower part of the node connection area. Several straight threaded sleeves 6 are pre-embedded at the lower part of the end of the prefabricated composite beam 2. The grout anchor steel bars 7 are threadedly connected to the straight threaded sleeves 6, which is safe, reliable and convenient to construct. The straight threaded sleeves 6 correspond one to one to the grout anchor steel bars 7. The node connection area of ​​the prefabricated column 1 and the end of the prefabricated composite beam 2 are connected and fixed by a concrete bonding layer 3 with a thickness of ≤100 mm.

[0022] The stress-bearing reinforcement 5 corresponds one-to-one to the reserved channel 4 at the upper part of the node connection area. Vertical reinforcement 8 is arranged around the inside of the prefabricated column 1, and a number of evenly distributed transverse stirrups 9 are sleeved on the outside of the vertical reinforcement 8, so that the prefabricated column 1 has a higher shear strength. Example 3 A prefabricated concrete beam-column node structure includes a prefabricated column 1, a prefabricated composite beam 2 and a concrete bonding layer 3. A node connection area is provided at the inflection point of the prefabricated column 1, and two rows of upper and lower reserved channels 4 are horizontally provided in the node connection area. A row of protruding stress-bearing bars 5 are provided at the upper end of the prefabricated composite beam 2. The ends of the stress-bearing bars 5 are embedded in the reserved channels 4 at the upper part of the node connection area. Grouting anchor steel bars 7 are embedded in the reserved channels 4 at the lower part of the node connection area. Several straight threaded sleeves 6 are embedded at the lower part of the end of the prefabricated composite beam 2. The grouting anchor steel bars 7 are threadedly connected to the straight threaded sleeves 6. The node connection area of ​​the prefabricated column 1 and the end of the prefabricated composite beam 2 are connected and fixed by a concrete bonding layer 3 with a thickness of ≤100 mm.

[0023] The straight threaded sleeve 6 corresponds one-to-one with the grout anchor steel bar 7, and the force-bearing bar 5 corresponds one-to-one with the reserved hole 4 at the top of the node connection area. Vertical bars 8 are arranged around the inside of the precast column 1, and a number of evenly distributed transverse stirrups 9 are sleeved on the outside of the vertical bars 8. The vertical bars 8 on the left and right sides of the precast column 1 are gate-shaped bars, and the transverse stirrups 9 are mouth-shaped stirrups. The gate-shaped bars can constrain the concrete and limit its lateral deformation under the action of an earthquake, thereby improving the ductility of the column. The increase in ductility means that the column can withstand greater deformation before failure, absorb more seismic energy, and reduce the risk of collapse of the structure in an earthquake. Under the action of seismic loads, the interaction between the gate-shaped bars and concrete can cause the structure to produce more plastic deformation, thereby consuming seismic energy. This energy-consuming effect helps to reduce the seismic response of the precast column and protect the overall safety of the precast column structure.

[0024] Example 4 A prefabricated concrete beam-column node structure includes a prefabricated column 1, a prefabricated composite beam 2 and a concrete bonding layer 3. A node connection area is provided at the inflection point of the prefabricated column 1, and two rows of upper and lower reserved channels 4 are horizontally provided in the node connection area. A row of protruding stress-bearing bars 5 are provided at the upper end of the prefabricated composite beam 2. The ends of the stress-bearing bars 5 are embedded in the reserved channels 4 at the upper part of the node connection area. Grouting anchor steel bars 7 are embedded in the reserved channels 4 at the lower part of the node connection area. Several straight threaded sleeves 6 are embedded at the lower part of the end of the prefabricated composite beam 2. The grouting anchor steel bars 7 are threadedly connected to the straight threaded sleeves 6. The node connection area of ​​the prefabricated column 1 and the end of the prefabricated composite beam 2 are connected and fixed by a concrete bonding layer 3 with a thickness of ≤100 mm.

[0025] The straight threaded sleeve 6 corresponds one-to-one with the grout anchor steel bar 7, the force-bearing bar 5 corresponds one-to-one with the reserved hole 4 at the top of the node connection area, vertical bars 8 are arranged around the inside of the precast column 1, and a number of evenly distributed transverse stirrups 9 are sleeved on the outside of the vertical bars 8. The vertical bars 8 on the left and right sides of the precast column 1 are gate-shaped bars, and the transverse stirrups 9 are mouth-shaped stirrups. The gate-shaped bars and the mouth-shaped stirrups form an integral steel skeleton, which increases the rigidity and stability of the skeleton. During the concrete pouring and hardening process, it can better withstand various external forces and avoid deformation or twisting of the steel skeleton. When the concrete column is subjected to axial pressure, it will produce lateral expansion deformation. The gate-shaped bars can form lateral constraints on the concrete, limit its lateral deformation, and thus improve the compressive strength and deformation capacity of the concrete. This constraint can make the concrete more compact when under pressure and give full play to the compressive properties of the concrete.

[0026] The precast composite beam 2 includes a precast beam 10 at the bottom and a post-cast concrete layer 11 at the top. The stress-bearing reinforcement 5 is an L-shaped reinforcement, part of which is located in the post-cast concrete layer 11 and part of which is located in the precast beam 10. The precast beam 10 is provided with transverse reinforcement 12 which is symmetrical with the stress-bearing reinforcement 5 in the upper and lower parts. A number of evenly distributed vertical stirrups I13 are provided on the outside of the stress-bearing reinforcement 5 and the transverse reinforcement 12.

[0027] The precast beams at the base of precast composite beams are prefabricated in the factory and then transported to the construction site for installation. This reduces the time required for on-site formwork, rebar tying, and concrete pouring, effectively shortening the overall construction period. Furthermore, the factory-produced precast beams utilize advanced production processes and quality control methods, ensuring better dimensional accuracy and consistent quality. These beams are unaffected by weather and other natural factors, facilitating concrete curing and quality control, and reducing potential quality issues that may arise during on-site construction, such as loose concrete pours and misaligned rebar placement.

[0028] The precast portion (i.e., the precast beam) and the post-cast portion (i.e., the post-cast concrete layer) of a precast composite beam are reliably connected to form a single unit, effectively working together to jointly bear the load. During use, the precast composite beam exhibits excellent stiffness and deformation properties, meeting the structural requirements.

[0029] Example 5 A prefabricated concrete beam-column node structure includes a prefabricated column 1, a prefabricated composite beam 2 and a concrete bonding layer 3. A node connection area is provided at the inflection point of the prefabricated column 1, and two rows of upper and lower reserved channels 4 are horizontally provided in the node connection area. A row of protruding stress-bearing bars 5 are provided at the upper end of the prefabricated composite beam 2. The ends of the stress-bearing bars 5 are embedded in the reserved channels 4 at the upper part of the node connection area. Grouting anchor steel bars 7 are embedded in the reserved channels 4 at the lower part of the node connection area. Several straight threaded sleeves 6 are embedded at the lower part of the end of the prefabricated composite beam 2. The grouting anchor steel bars 7 are threadedly connected to the straight threaded sleeves 6. The node connection area of ​​the prefabricated column 1 and the end of the prefabricated composite beam 2 are connected and fixed by a concrete bonding layer 3 with a thickness of ≤100 mm.

[0030] The straight threaded sleeve 6 corresponds one-to-one with the grouting anchor steel bar 7, the force-bearing bar 5 corresponds one-to-one with the reserved channel 4 on the upper part of the node connection area, vertical bars 8 are arranged around the inside of the precast column 1, and a number of evenly distributed transverse stirrups 9 are sleeved on the outside of the vertical bars 8. The vertical bars 8 on the left and right sides of the precast column 1 are door-type bars, and the transverse stirrups 9 are mouth-type stirrups.

[0031] The precast composite beam 2 includes a precast beam 10 at the bottom and a post-cast concrete layer 11 at the top. The stress-bearing reinforcement 5 is an L-shaped reinforcement, part of which is located in the post-cast concrete layer 11 and part of which is located in the precast beam 10. The precast beam 10 is provided with transverse reinforcement 12 which is symmetrical with the stress-bearing reinforcement 5 in the upper and lower parts. A number of evenly distributed vertical stirrups I13 are provided on the outside of the stress-bearing reinforcement 5 and the transverse reinforcement 12.

[0032] The straight threaded sleeve 6 is located on the end face of the precast beam 10, corresponding one-to-one with the tension bars 5 in the precast beam 10. Vertical stirrups II 14 are provided outside the tension bars 5 and the straight threaded sleeve 6. Vertical stirrups III 15 are provided outside the tension bars 5 and the grout anchor bars 7.

[0033] Example 6 A prefabricated concrete beam-column node structure includes a prefabricated column 1, a prefabricated composite beam 2 and a concrete bonding layer 3. A node connection area is provided at the inflection point of the prefabricated column 1, and two rows of upper and lower reserved channels 4 are horizontally provided in the node connection area. A row of protruding stress-bearing bars 5 are provided at the upper end of the prefabricated composite beam 2. The ends of the stress-bearing bars 5 are embedded in the reserved channels 4 at the upper part of the node connection area. Grouting anchor steel bars 7 are embedded in the reserved channels 4 at the lower part of the node connection area. Several straight threaded sleeves 6 are embedded at the lower part of the end of the prefabricated composite beam 2. The grouting anchor steel bars 7 are threadedly connected to the straight threaded sleeves 6. The node connection area of ​​the prefabricated column 1 and the end of the prefabricated composite beam 2 are connected and fixed by a concrete bonding layer 3 with a thickness of ≤100 mm.

[0034] The precast composite beam 2 includes a precast beam 10 at the bottom and a post-cast concrete layer 11 at the top. The stress-bearing reinforcement 5 is an L-shaped reinforcement, part of which is located in the post-cast concrete layer 11 and part of which is located in the precast beam 10. The precast beam 10 is provided with transverse reinforcement 12 which is symmetrical with the stress-bearing reinforcement 5 in the upper and lower parts. A number of evenly distributed vertical stirrups I13 are provided on the outside of the stress-bearing reinforcement 5 and the transverse reinforcement 12.

[0035] The straight threaded sleeve 6 is located on the end face of the precast beam 10, corresponding one-to-one with the tension bars 5 in the precast beam 10. Vertical stirrups II 14 are provided outside the tension bars 5 and the straight threaded sleeve 6. Vertical stirrups III 15 are provided outside the tension bars 5 and the grout anchor bars 7.

[0036] Example 7 A construction method for an assembled concrete beam-column node structure comprises first hoisting a precast column 1 into position, positioning and fixing it, leaving a grouting anchor steel bar 7 in a reserved channel 4 at the lower portion of the node connection area of ​​the precast column 1, then hoisting a precast beam 10, inserting a force-bearing bar 5 into a reserved channel 4 at the upper portion of the node connection area of ​​the precast column 1, positioning and temporarily fixing the precast beam 10, effectively connecting the grouting anchor steel bar 7 to a straight threaded sleeve 6 pre-buried at the end of the precast beam 10, pouring ultra-high performance concrete between the node connection area of ​​the precast column 1 and the end of the precast composite beam 2 to form a concrete bonding layer 3, and finally pouring concrete on the top of the precast beam 10 to form a post-cast concrete layer 11, thereby completing the assembly of the beam and column.

[0037] Ultra-high performance concrete, abbreviated as UHPC, has ultra-high durability and ultra-high mechanical properties. Its compressive strength can reach 120-180 MPa, its tensile strength can reach 4.5-24 MPa, its fracture energy can reach 10-40 kN·m / m, its elastic modulus can reach 37-55 GPa, and its ultimate bending strength can reach 18-35 MPa. In this application, ultra-high performance concrete is poured between the node connection area of ​​the precast column 1 and the end of the precast composite beam 2 to form a concrete bonding layer. Appropriate reinforcement makes the mechanical properties of the concrete bonding layer close to those of steel structure, so that the prefabricated concrete beam-column node structure of this application has ultra-high mechanical properties and is suitable for long-span pedestrian overpasses, highway and railway bridges, explosion-resistant structures and thin-walled structures.

[0038] Example 8 A construction method for an assembled concrete beam-column node structure comprises first hoisting a precast column 1 into position, positioning and fixing it, leaving a grouting anchor steel bar 7 in a reserved channel 4 at the lower portion of the node connection area of ​​the precast column 1, then hoisting a precast beam 10, inserting a force-bearing bar 5 into a reserved channel 4 at the upper portion of the node connection area of ​​the precast column 1, positioning and temporarily fixing the precast beam 10, effectively connecting the grouting anchor steel bar 7 to a straight threaded sleeve 6 pre-buried at the end of the precast beam 10, pouring ultra-high performance concrete between the node connection area of ​​the precast column 1 and the end of the precast composite beam 2 to form a concrete bonding layer 3, and finally pouring concrete on the top of the precast beam 10 to form a post-cast concrete layer 11, thereby completing the assembly of the beam and column.

[0039] The diameter of the reserved channel 4 at the lower part of the node connection area of ​​the precast column 1 is 2mm to 4mm larger than the diameter of the grouting anchor steel bar 7. During the process of pouring ultra-high performance concrete between the node connection area of ​​the precast column 1 and the end of the precast composite beam 2, the ultra-high performance concrete flows into the gap between the reserved channel 4 and the grouting anchor steel bar 7 and the stress-bearing reinforcement 5, thereby strengthening the connection strength between the reserved channel 4 and the grouting anchor steel bar 7 and the stress-bearing reinforcement 5.

Claims

1. Prefabricated concrete beam-column node structure, characterized in that: The invention comprises a prefabricated column (1), a prefabricated composite beam (2) and a concrete bonding layer (3). A node connection area is provided at the inflection point of the prefabricated column (1). Two rows of upper and lower reserved channels (4) are horizontally provided in the node connection area. A row of protruding stress reinforcement (5) is provided at the upper end of the prefabricated composite beam (2). The end of the stress reinforcement (5) is embedded in the upper reserved channel (4) of the node connection area. A grout anchor steel bar (7) is pre-buried in the lower reserved channel (4) of the node connection area. Several straight thread sleeves (6) are pre-buried at the lower end of the prefabricated composite beam (2). The grout anchor steel bar (7) is threadedly connected to the straight thread sleeves (6). The node connection area of ​​the prefabricated column (1) and the end of the prefabricated composite beam (2) are connected and fixed via a concrete bonding layer (3) with a thickness of ≤100 mm.

2. The assembled concrete beam-column node structure according to claim 1, characterized in that: The straight threaded sleeves (6) correspond one-to-one to the grout anchor steel bars (7), and the stress-bearing bars (5) correspond one-to-one to the reserved holes (4) at the top of the node connection area.

3. The assembled concrete beam-column node structure according to claim 1, characterized in that: Vertical reinforcements (8) are arranged around the interior of the prefabricated column (1), and a plurality of evenly distributed transverse stirrups (9) are sleeved on the outside of the vertical reinforcements (8).

4. The assembled concrete beam-column node structure according to claim 3, characterized in that: The vertical reinforcements (8) on the left and right sides of the prefabricated column (1) are gate-shaped reinforcements, and the transverse stirrups (9) are mouth-shaped stirrups.

5. The assembled concrete beam-column node structure according to claim 1, characterized in that: The prefabricated composite beam (2) comprises a prefabricated beam (10) at the bottom and a post-cast concrete layer (11) at the top. The stress reinforcement (5) is an L-shaped reinforcement, a portion of which is located in the post-cast concrete layer (11) and a portion of which is located in the prefabricated beam (10). The prefabricated beam (10) is provided with transverse reinforcement (12) symmetrical with the stress reinforcement (5) in the upper and lower parts. A plurality of vertical stirrups I (13) are provided outside the stress reinforcement (5) and the transverse reinforcement (12).

6. The assembled concrete beam-column node structure according to claim 5, characterized in that: The straight threaded sleeve (6) is located on the end face of the prefabricated beam (10) and corresponds one-to-one with the stress reinforcement (5) in the prefabricated beam (10).

7. The assembled concrete beam-column node structure according to claim 5, characterized in that: The outer sides of the stress-bearing reinforcement (5) and the straight threaded sleeve (6) are provided with vertical stirrups II (14).

8. The assembled concrete beam-column node structure according to claim 5, characterized in that: Vertical stirrups III (15) are sleeved on the outer sides of the stress-bearing bars (5) and the grout anchor bars (7).

9. The construction method of the assembled concrete beam-column node structure according to any one of claims 5 to 8, characterized in that: The method includes first hoisting the precast column (1) into place, positioning and fixing it, leaving the grout anchor steel bar (7) in the reserved hole (4) at the lower part of the node connection area of ​​the precast column (1), then hoisting the precast beam (10), inserting the force reinforcement (5) into the reserved hole (4) at the upper part of the node connection area of ​​the precast column (1), positioning and temporarily fixing the precast beam (10), effectively connecting the grout anchor steel bar (7) with the straight thread sleeve (6) embedded at the end of the precast beam (10), then pouring ultra-high performance concrete between the node connection area of ​​the precast column (1) and the end of the precast composite beam (2) to form a concrete bonding layer (3), and finally pouring concrete on the top of the precast beam (10) to form a post-cast concrete layer (11), thereby completing the assembly of the beam and column.

10. The construction method of the assembled concrete beam-column node structure according to claim 9, characterized in that: The diameter of the reserved channel (4) at the lower part of the node connection area of ​​the precast column (1) is 2 mm to 4 mm larger than the diameter of the grout anchor steel bar (7). During the process of pouring ultra-high performance concrete between the node connection area of ​​the precast column (1) and the end of the precast composite beam (2), the ultra-high performance concrete flows into the gap between the reserved channel (4) and the grout anchor steel bar (7) and the stress reinforcement (5), thereby strengthening the connection strength between the reserved channel (4) and the grout anchor steel bar (7) and the stress reinforcement (5).

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