Connection joint of PEC beam and PEC column and construction method of connection joint
By setting reinforcing longitudinal bars inside the PEC beam and connecting it to the PEC column using the beam end reinforcement liner, the problem of anchoring the reinforcing longitudinal bars when connecting the PEC beam and PEC column is solved, which improves the load-bearing capacity and economy of the PEC beam and simplifies the construction process.
Patent Information
- Application Number
- CN202511856913.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-02-24
AI Technical Summary
In the existing technology, when PEC beams are connected to PEC columns, the longitudinal reinforcement is difficult to anchor, which results in the PEC beam's load-bearing capacity not being fully utilized, and the connection node is not economical.
By setting longitudinal reinforcement bars inside the PEC beam and connecting them to the PEC column through the beam end reinforcement liner, the anchorage problem of the longitudinal reinforcement bars is solved, ensuring reliable force transmission. The method of factory prefabrication and on-site connection simplifies the construction process.
This method enables reliable force transfer of the longitudinal reinforcement in PEC beams, improving the load-bearing capacity and economy of PEC beams. Furthermore, it eliminates the need for post-cast concrete in the joint area, ensuring the flatness of the joints and facilitating construction.
Smart Images
Figure CN121556590A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of prefabricated buildings, specifically to a connection node between a PEC beam and a PEC column and a construction method for the connection node. Background Technology
[0002] When longitudinal reinforcement is placed in partially reinforced steel-concrete composite beams (PEC beams), the load-bearing capacity of the PEC beams can be significantly improved. However, current codes do not specify the anchorage method for the longitudinal reinforcement at beam-column connections. In actual engineering projects, when connecting PEC beams to PEC columns, it is difficult to anchor the longitudinal reinforcement of the PEC beams into the PEC columns, especially in the weak axis direction, because the weak axis direction of the PEC column is the precast concrete surface. Therefore, there are almost no engineering cases in which longitudinal reinforcement is placed in PEC beams; PEC beam members without longitudinal reinforcement are used in all cases.
[0003] In existing technologies, when a PEC beam without longitudinal reinforcement is connected to a partially encased steel-concrete composite column (PEC column), the connection joint requires on-site welding of reinforcing bars after the main steel components are connected, followed by on-site pouring of concrete in the joint area. Some solutions employ a no-pouring joint, using a pure steel beam with a cover plate to reinforce the joint connection area.
[0004] Existing connection nodes cannot address the anchorage issue of longitudinal reinforcement in PEC beams within PEC columns. Therefore, the load-bearing capacity contribution of the longitudinal reinforcement in PEC beams cannot be accounted for, or longitudinal reinforcement in PEC beams may be omitted altogether. This fails to fully utilize the load-bearing capacity advantage of PEC beams and prevents adjustments to steel usage based on the stress characteristics of different areas within the beam span, resulting in poor economic efficiency for PEC beams. Summary of the Invention
[0005] This invention first discloses a connection node between a PEC beam and a PEC column, which not only sets longitudinal reinforcement in the PEC beam, but also solves the anchorage problem between the longitudinal reinforcement in the PEC beam and the PEC column, ensuring reliable force transmission of the longitudinal reinforcement in the PEC beam, and facilitating on-site construction.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A connection node between a PEC beam and a PEC column includes a PEC beam and a PEC column. Reinforcing liner plates are welded to both sides of the web of the PEC beam on the bottom surface of the upper flange and the top surface of the lower flange. These reinforcing liner plates are parallel to the flanges of the PEC beam. Concrete baffles are welded to both sides of the web of the PEC beam between the upper and lower reinforcing liner plates. The concrete baffles are perpendicular to the web and flanges of the PEC beam. Upper longitudinal reinforcement, lower longitudinal reinforcement, structural reinforcement, and connecting rods are respectively provided on both sides of the web of the PEC beam inside the concrete baffles. The upper longitudinal reinforcement is connected to the lower longitudinal reinforcement... The reinforcing bars are parallel and welded to the corresponding beam end reinforcement plates. The connecting rods are vertically connected to the upper and lower longitudinal reinforcing bars. The structural reinforcing bars are parallel to the longitudinal reinforcing bars and welded to the concrete baffle. The strong shaft extension single connecting plate is welded to the outer wall of the flange of the PEC column. Bolt holes are opened on the strong shaft extension single connecting plate. The strong shaft extension single connecting plate is perpendicular to the flange of the PEC column and parallel to the web of the PEC beam. The strong shaft extension single connecting plate is bolted to the web of the PEC beam and the two are welded and fixed. The flange of the PEC beam and the beam end reinforcement plates are welded and fixed to the flange of the PEC column. The PEC column has upper and lower horizontal stiffening plates inside its cavity. These plates are vertically welded between the flanges and onto the web of the PEC column. Longitudinal reinforcing bars are drilled through the plates. The upper and lower horizontal stiffening plates extend symmetrically outwards from the same side to form connecting brackets. Reinforcing inner plates are welded to the opposite surfaces of the upper and lower connecting brackets, parallel to the connecting brackets and welded to the PEC column web. A weak-axis extended single connecting plate is welded between the upper and lower reinforcing inner plates, perpendicularly welded to the PEC column web. A transverse reinforcing bar through-hole is provided on the side of the weak axis extended single connecting plate near the web of the PEC column, and a bolt hole is provided on the side of the weak axis extended single connecting plate away from the web of the PEC column; PEC column internal reinforcing bars are provided on both sides of the web of the PEC column, and the PEC column internal reinforcing bars are divided into transverse reinforcing bars and longitudinal reinforcing bars. The longitudinal reinforcing bars pass through the longitudinal reinforcing bar through-hole, and the transverse reinforcing bars pass through the transverse reinforcing bar through-hole; when the PEC column is connected to the PEC beam in the direction of the weak axis, the connecting bracket is welded to the flange of the PEC beam, the inner lining plate of the bracket reinforcement is welded to the inner lining plate of the beam end, and the weak axis extended single connecting plate is bolted to the web of the PEC beam and the two are welded and fixed.
[0007] Furthermore, the welding length between the upper longitudinal reinforcement and the beam end reinforcing liner is not less than five times the diameter of the upper longitudinal reinforcement, and the welding length between the lower longitudinal reinforcement and the beam end reinforcing liner is not less than five times the diameter of the lower longitudinal reinforcement.
[0008] This invention also discloses a construction method for the connection node between the PEC beam and the PEC column, comprising the following steps: Step 1): Process the main steel components of the PEC column in the factory, and weld the strong axis extension single connecting plate to the outer wall of the PEC column flange. Weld the connecting bracket, the bracket reinforcement inner liner plate and the weak axis extension single connecting plate to the weak axis direction of the PEC column. Step 2): Process the main steel components of the PEC beam in the factory, and weld the beam end reinforcing liner plate to the inner wall of the PEC beam flange. Weld a concrete baffle plate between the upper and lower beam end reinforcing liner plates. Steps 2) and 1) above are not in any particular order; Step 3): Process the longitudinal reinforcement, structural reinforcement and connecting rods in the PEC beam in the factory, and complete the welding and binding with the main steel components of the PEC beam. Weld the longitudinal reinforcement to the reinforcing liner plate at the beam end; process the reinforcement in the PEC column in the factory, and complete the welding and binding with the reinforcement in the column and the main steel components of the PEC column. Step 4): Pre-cast concrete on both sides of the web of the PEC column in the factory, and pre-cast concrete on both sides of the web of the PEC beam inside the concrete baffle in the factory. Step 5): Transport the PEC columns and PEC beams to the construction site; Step 6): Install a PEC beam in both the strong axis direction and the weak axis direction of the PEC column. Bolt the single connecting plate extending outward along the strong axis to the web of the PEC beam, and bolt the single connecting plate extending outward along the weak axis to the web of the PEC beam. Step 7): After completing Step 6), weld and fix the strong shaft extended single connecting plate to the web of the PEC beam, and weld and fix the weak shaft extended single connecting plate to the web of the PEC beam. Step 8): In the strong axis direction of the PEC column, weld the beam end reinforcing liner plate and the PEC beam flange together onto the PEC column flange; in the weak axis direction of the PEC column, weld the connecting bracket to the PEC beam flange, and weld the bracket reinforcing liner plate to the beam end reinforcing liner plate.
[0009] Furthermore, determine whether the strength and stiffness provided by the beam end reinforcing liner are greater than those provided by the PEC beam section. If the strength and stiffness provided by the beam end reinforcing liner are less than those provided by the PEC beam section, then after completing step 8), concrete post-pouring is required on the outside of the concrete baffle at the connection node area. If the strength and stiffness provided by the beam end reinforcing liner are greater than those provided by the PEC beam section, then concrete post-pouring is not required on the outside of the concrete baffle at the connection node area.
[0010] This invention adds a beam-end reinforcing liner plate inside the PEC beam and welds the longitudinal reinforcement bars inside the beam to the beam-end reinforcing liner plate. The beam-end reinforcing liner plate ensures a connection of equal strength with the longitudinal reinforcement bars, solving the problem in the prior art that the longitudinal reinforcement bars inside the PEC beam cannot be anchored into the PEC column. It can fully utilize the role of the longitudinal reinforcement bars inside the PEC beam, improve the load-bearing capacity of the PEC beam, and the longitudinal reinforcement bars inside the PEC beam can be flexibly arranged in the area with the greatest stress, while ensuring reliable anchorage of the reinforcement bars at the ends, thus improving the economy of PEC beam components. By adjusting the thickness of the beam-end reinforcing liner plate, it can meet the problem of eliminating the need for post-cast concrete in the beam-column joint area. Compared with existing no-cast joints, the connection joint of this invention can ensure that the upper flange surface is flat, which is convenient for placing precast floor slabs. Attached Figure Description
[0011] Figure 1 This is a three-dimensional structural diagram of the connection node between the PEC beam and the PEC column in the embodiment; Figure 2 This is an exploded view of the connection node between the PEC beam and the PEC column in the embodiment; Figure 3 This is a top view of the connection node between the PEC beam and the PEC column in the embodiment; Figure 4 for Figure 3 Sectional view of AA in the middle; Figure 5 for Figure 3 Cross-sectional view of the middle section (BB).
[0012] Figure label: 1. PEC column; 2. PEC beam; 3. Outwardly extending single connecting plate; 4. Concrete baffle; 5. Beam end reinforcing liner; 6. PEC column horizontal stiffening plate; 7. Connecting corbel; 8. Corbel reinforcing liner; 9. PEC column internal reinforcement; 10. PEC column flange; 11. PEC beam flange; 12. PEC beam web; 13. Upper longitudinal reinforcement; 14. Lower longitudinal reinforcement; 15. Connecting rod; 16. PEC column precast concrete; 17. Structural reinforcement; 18. PEC beam precast concrete. Detailed Implementation
[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
[0014] This embodiment discloses a connection node between a PEC beam and a PEC column, such as... Figures 1 to 5As shown, it mainly includes PEC beam 2 and PEC column 1, both of which are prefabricated in the factory. The direction in which PEC beam 2 connects to the PEC column flange 10 is the strong axis direction of PEC column 1, and the direction in which PEC beam 2 connects to the PEC column precast concrete 16 is the weak axis direction of PEC column 1. In this embodiment, the PEC beam 2 connected in both the strong and weak axis directions has the same structure. PEC beam 2 includes PEC beam flange 11, PEC beam web 12, and PEC beam precast concrete 18. PEC beam flange 11 is divided into upper and lower flanges. In this embodiment, beam end reinforcing liner plates 5 are welded to the bottom surface of the upper flange and the top surface of the lower flange at the connection end, respectively. The beam end reinforcing liner plates 5 are parallel to the PEC beam flange 11 and are fixedly connected by fillet welds. Concrete baffles 4 are installed on both sides of the PEC beam web 12 near the connection end of the PEC beam 2. The concrete baffles 4 are perpendicular to the PEC beam web 12, and the sides of the concrete baffles 4 are welded to the PEC beam web 12. The upper and lower ends of the concrete baffles 4 are welded to the beam end reinforcing liner 5. Taking the connection end as the outer side, bolt holes are opened on the PEC beam web 12 located outside the concrete baffles 4. On both sides of the PEC beam web 12 located inside the concrete baffles 4, longitudinal reinforcement, connecting rods 15, and structural reinforcement 17 are respectively provided. The longitudinal reinforcement is divided into upper longitudinal reinforcement 13 and lower longitudinal reinforcement 14 arranged in parallel. Structural reinforcement 17 is also provided between the upper longitudinal reinforcement 13 and the lower longitudinal reinforcement 14. The structural reinforcement 17 is parallel to the longitudinal reinforcement. Connecting rods 15 are spaced apart between the upper longitudinal reinforcement 13 and the lower longitudinal reinforcement 14. The connecting rods 15 are perpendicular to the longitudinal reinforcement and are tied together. Structural reinforcement 17 is tied to the connecting rods 15, and the ends of the structural reinforcement 17 are welded to the concrete baffle 4. The upper longitudinal reinforcement 13 and the lower longitudinal reinforcement 14 are respectively welded to the corresponding beam end reinforcing liner 5 using double-sided fillet welds. The weld length between the longitudinal reinforcement and the beam end reinforcing liner 5 is not less than five times the diameter of the longitudinal reinforcement. After completing the above connection structure, concrete is poured on both sides of the web 12 of the PEC beam and inside the concrete baffle 4. At this point, the prefabrication of the PEC beam 2 structure is completed.
[0015] The structure of PEC column 1 includes PEC column flange 10, PEC column web, and PEC column precast concrete 16. PEC column internal reinforcing bars 9 are provided on both sides of the PEC column web. These internal reinforcing bars 9 are divided into transverse and longitudinal reinforcing bars. The two ends of the transverse reinforcing bars are welded to the inner wall of the PEC column flange 10, and the longitudinal reinforcing bars are tied or welded to the transverse reinforcing bars. Two parallel PEC column horizontal stiffening plates 6 are provided inside the cavity of PEC column 1. The PEC column horizontal stiffening plates 6 are perpendicular to the PEC column web and welded to it. The two ends of the PEC column horizontal stiffening plates 6 are welded to the inner wall of the PEC column flange 10. Longitudinal reinforcing bar through-holes are provided on the PEC column horizontal stiffening plates 6, through which the longitudinal reinforcing bars pass. The upper and lower PEC column horizontal stiffening plates 6 extend symmetrically outward from the same side to form connecting brackets 7. The bottom surface of the upper connecting bracket 7 and the top surface of the lower connecting bracket 7 are respectively welded with bracket reinforcing liner plates 8. The bracket reinforcing liner plates 8 are parallel to the connecting brackets 7. The bracket reinforcing liner plates 8 are connected to the PEC column web by a section full penetration weld, and the bracket reinforcing liner plates 8 are connected to the connecting brackets 7 by a fillet weld. An extended single connecting plate 3 is provided between the upper and lower corbel reinforcing liner plates 8. The extended single connecting plate 3 is perpendicular to the PEC column web and the two are connected by fillet welds. The upper and lower ends of the extended single connecting plate 3 are welded to the corbel reinforcing liner plates 8. The inner side of the extended single connecting plate 3 is connected to the PEC column web by fillet welds. A transverse steel bar through hole is opened on the side of the extended single connecting plate 3 near the PEC column web, and the transverse steel bar passes through the transverse steel bar through hole. A bolt hole is opened on the side of the extended single connecting plate 3 away from the PEC column web. Concrete is pre-cast on both sides of the PEC column web in the factory. After the concrete is pre-cast, the connecting ends of the corbel 7, the corbel reinforcing liner plates 8, and the extended single connecting plate 3 are all exposed. During the prefabrication of PEC column 1 in the factory, an extended single connecting plate 3 is welded to one end of the PEC beam 2 connected to the outer wall of the PEC column flange 10. To distinguish it from the extended single connecting plate 3 at the weak axis, this is referred to as the strong axis extended single connecting plate. The strong axis extended single connecting plate is perpendicular to the PEC column flange 10, and bolt holes are made on the strong axis extended single connecting plate. At this point, the prefabrication of PEC column 1 is completed in the factory.
[0016] During on-site assembly, a PEC beam 2 is connected to each of the strong and weak axes of PEC column 1. For connection, the extended single connecting plate 3 is first attached to the web 12 of the PEC beam and fixed with bolts. Then, the extended single connecting plate 3 is fixed to the web 12 of the PEC beam using fillet welds on three sides. In the strong axis direction of PEC column 1, the beam end reinforcing liner 5 of PEC beam 2 and the PEC beam flange 11 are fixed to the PEC column flange 10 using a sectioned full-penetration weld. In the weak axis direction of PEC column 1, the connecting bracket 7 is fixed to the PEC beam flange 11 using a sectioned full-penetration weld, and the bracket reinforcing liner 8 is fixed to the beam end reinforcing liner 5 of PEC beam 2 using a sectioned full-penetration weld.
[0017] When considering the beam end reinforcement liner 5, if the strength and stiffness of the end steel beam are greater than the strength and stiffness provided by the PEC beam 2 section, then the PEC beam web 12 located outside the concrete baffle 4 at the connection node area does not need to be post-cast with concrete; otherwise, post-cast concrete on both sides of the connection node web is required after the on-site connection is completed.
[0018] In this embodiment, the beam-end reinforcing liner 5 is welded to the longitudinal reinforcement in the PEC beam 2. The strength provided by the beam-end reinforcing liner 5 is not less than that provided by the longitudinal reinforcement, and the double-sided fillet weld at the connection point is more than 5d in length. It can be considered that the bearing capacity of the longitudinal reinforcement has been equally transferred to the main steel member. Only the steel member needs to be connected at the beam-column connection point. In addition to anchoring the longitudinal reinforcement, the beam-end reinforcing liner 5 can also strengthen the joint area. That is, by adjusting the thickness of the beam-end reinforcing liner 5, it can meet the seismic requirements of strong joint and weak member in the joint area, thus eliminating the need for post-concrete pouring in the joint area. Through the above design in this embodiment, the part of the PEC beam 2 with precast steel bars and concrete transitions to the part outside the concrete baffle 4 without steel bars and concrete but with beam end reinforcing lining plate 5. The two have an overlapping area, which can ensure the reliable force transmission of the steel bars while preventing damage within the overlapping area. Damage will first occur on the PEC beam 2 outside the overlapping area, thereby achieving the seismic requirements of "strong node weak member".
[0019] The construction method for the connection node between the PEC beam and the PEC column disclosed in this embodiment includes the following steps: Step 1): The main steel component of PEC column 1 is processed in the factory, and the strong axis extension single connecting plate 3 is welded to the outer wall of PEC column flange 10. The corbel 7, corbel reinforcing inner liner 8 and weak axis extension single connecting plate 3 are welded to the weak axis direction of PEC column 1. Step 2): Process the main steel component of PEC beam 2 in the factory, and weld the beam end reinforcing liner plate 5 on the inner wall of the PEC beam flange 11. Weld the concrete baffle plate 4 between the upper and lower beam end reinforcing liner plates 5. Steps 2) and 1) above are not in any particular order; Step 3): Process the longitudinal reinforcement bars, structural reinforcement bars 17 and connecting rods 15 in the factory and complete the welding and binding with the main steel components of the PEC beam 2. Weld the longitudinal reinforcement bars to the beam end reinforcing liner plate 5. Process the reinforcement bars 9 in the PEC column in the factory and complete the welding and binding with the main steel components of the PEC column 1. Step 4): Precast concrete on both sides of the PEC column web in the factory, and precast concrete on both sides of the PEC beam web 12 inside the concrete baffle 4 in the factory. Step 5): Transport PEC column 1 and PEC beam 2 to the construction site; Step 6): Set up a PEC beam 2 in both the strong axis direction and the weak axis direction of PEC column 1, bolt the strong axis extended single connecting plate 3 to the web plate 12 of the PEC beam, and bolt the weak axis extended single connecting plate 3 to the web plate 12 of another PEC beam. Step 7): After completing Step 6), weld and fix the strong shaft extended single connecting plate 3 to the PEC beam web 12, and weld and fix the weak shaft extended single connecting plate 3 to the PEC beam web 12. Step 8): In the strong axis direction of PEC column 1, weld the beam end reinforcing liner 5 and the PEC beam flange 11 together onto the PEC column flange 10; in the weak axis direction of PEC column 1, weld the connecting bracket 7 to the PEC beam flange 11, and weld the bracket reinforcing liner 8 to the beam end reinforcing liner 5.
[0020] Step 9): Determine whether the strength and stiffness provided by the beam end reinforcing liner 5 are greater than the strength and stiffness provided by the PEC beam 2 section. If the strength and stiffness provided by the beam end reinforcing liner 5 are less than the strength and stiffness provided by the PEC beam 2 section, then after completing Step 8), concrete post-pouring is required on the outside of the concrete baffle 4 at the connection node area. If the strength and stiffness provided by the beam end reinforcing liner 5 are greater than the strength and stiffness provided by the PEC beam 2 section, then concrete post-pouring is not required on the outside of the concrete baffle 4 at the connection node area.
[0021] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A connection node between a PEC beam and a PEC column, comprising a PEC beam and a PEC column, characterized in that: The PEC beam has end-reinforcing plates welded to both sides of its web, located on the bottom surface of the upper flange and the top surface of the lower flange. These end-reinforcing plates are parallel to the PEC beam flanges. Concrete baffles are welded to both sides of the PEC beam web between the upper and lower end-reinforcing plates. These concrete baffles are perpendicular to the PEC beam web and flanges. Inside the concrete baffles, on both sides of the PEC beam web, are upper longitudinal reinforcement, lower longitudinal reinforcement, structural reinforcement, and connecting rods. The upper and lower longitudinal reinforcements are parallel to each other and are welded to the corresponding end-reinforcing plates. On the reinforced inner lining plate, the connecting rod is vertically connected to the upper and lower longitudinal reinforcing bars. The structural reinforcing bars are parallel to the longitudinal reinforcing bars and are welded to the concrete baffle plate. The outer wall of the flange of the PEC column is welded with a single connecting plate extending outward from the strong axis. Bolt holes are opened on the single connecting plate extending outward from the strong axis. The single connecting plate extending outward from the strong axis is perpendicular to the flange of the PEC column and parallel to the web of the PEC beam. The single connecting plate extending outward from the strong axis is bolted to the web of the PEC beam and the two are welded and fixed. The flange of the PEC beam and the reinforcing inner lining plate at the beam end are welded and fixed to the flange of the PEC column. The PEC column has upper and lower horizontal stiffening plates inside its cavity. These plates are vertically welded between the flanges and onto the web of the PEC column. Longitudinal reinforcing bars are drilled through the plates. The upper and lower horizontal stiffening plates extend symmetrically outwards from the same side to form connecting brackets. Reinforcing inner plates are welded to the opposite surfaces of the upper and lower connecting brackets, parallel to the connecting brackets and welded to the PEC column web. A weak-axis extended single connecting plate is welded between the upper and lower reinforcing inner plates, perpendicularly welded to the PEC column web. A transverse reinforcing bar through-hole is provided on the side of the weak axis extended single connecting plate near the web of the PEC column, and a bolt hole is provided on the side of the weak axis extended single connecting plate away from the web of the PEC column; PEC column internal reinforcing bars are provided on both sides of the web of the PEC column, and the PEC column internal reinforcing bars are divided into transverse reinforcing bars and longitudinal reinforcing bars. The longitudinal reinforcing bars pass through the longitudinal reinforcing bar through-hole, and the transverse reinforcing bars pass through the transverse reinforcing bar through-hole; when the PEC column is connected to the PEC beam in the direction of the weak axis, the connecting bracket is welded to the flange of the PEC beam, the inner lining plate of the bracket reinforcement is welded to the inner lining plate of the beam end, and the weak axis extended single connecting plate is bolted to the web of the PEC beam and the two are welded and fixed.
2. The connection node between a PEC beam and a PEC column according to claim 1, characterized in that: The welding length between the upper longitudinal reinforcement and the beam end reinforcing liner plate shall not be less than five times the diameter of the upper longitudinal reinforcement, and the welding length between the lower longitudinal reinforcement and the beam end reinforcing liner plate shall not be less than five times the diameter of the lower longitudinal reinforcement.
3. The construction method for the connection node between the PEC beam and the PEC column as described in any one of claims 1 or 2, characterized in that, Includes the following steps: Step 1): Process the main steel components of the PEC column in the factory, and weld the strong axis extension single connecting plate to the outer wall of the PEC column flange. Weld the connecting bracket, the bracket reinforcement inner liner plate and the weak axis extension single connecting plate to the weak axis direction of the PEC column. Step 2): Process the main steel components of the PEC beam in the factory, and weld the beam end reinforcing liner plate to the inner wall of the PEC beam flange. Weld a concrete baffle plate between the upper and lower beam end reinforcing liner plates. Steps 2) and 1) above are not in any particular order; Step 3): Process the longitudinal reinforcement, structural reinforcement and connecting rods in the PEC beam in the factory, and complete the welding and binding with the main steel components of the PEC beam. Weld the longitudinal reinforcement to the reinforcing liner plate at the beam end; process the reinforcement in the PEC column in the factory, and complete the welding and binding with the reinforcement in the column and the main steel components of the PEC column. Step 4): Pre-cast concrete on both sides of the web of the PEC column in the factory, and pre-cast concrete on both sides of the web of the PEC beam inside the concrete baffle in the factory. Step 5): Transport the PEC columns and PEC beams to the construction site; Step 6): Install a PEC beam in both the strong axis direction and the weak axis direction of the PEC column. Bolt the single connecting plate extending outward along the strong axis to the web of the PEC beam, and bolt the single connecting plate extending outward along the weak axis to the web of the PEC beam. Step 7): After completing Step 6), weld and fix the strong shaft extended single connecting plate to the web of the PEC beam, and weld and fix the weak shaft extended single connecting plate to the web of the PEC beam. Step 8): In the strong axis direction of the PEC column, weld the beam end reinforcing liner plate and the PEC beam flange together onto the PEC column flange; in the weak axis direction of the PEC column, weld the connecting bracket to the PEC beam flange, and weld the bracket reinforcing liner plate to the beam end reinforcing liner plate.
4. The construction method for the connection node between PEC beam and PEC column according to claim 3, characterized in that: Determine whether the strength and stiffness provided by the beam end reinforcement liner plate are greater than the strength and stiffness provided by the PEC beam section. If the strength and stiffness provided by the beam end reinforcement liner plate are less than the strength and stiffness provided by the PEC beam section, then after completing step 8), concrete post-pouring is required on the outside of the concrete baffle at the connection node area. If the strength and stiffness provided by the beam end reinforcement liner are greater than those provided by the PEC beam section, then it is not necessary to pour concrete on the outside of the concrete baffle at the connection node area.