Steel-framed non-penetrating connection nodes and construction methods based on UHPC composite beams and columns

Abstract

This invention relates to a non-penetrating steel section connection node based on UHPC composite beams and columns and its construction method. The connection node includes precast beams on the left and right sides, each further comprising a steel section cast and fixed integrally with the corresponding precast beam concrete. One end of the steel section includes an upper flange plate, a lower flange plate, and an intermediate web plate connecting the upper and lower flange plates. The lower flange plate is located inside the precast beam concrete, and the upper flange plate is located above the precast beam concrete. A vertical connecting steel plate is welded and fixed to the upper side of the upper flange plate. Multiple connecting holes are spaced apart along the left-right direction on the vertical connecting steel plate. The connection node also includes connecting ring bars corresponding to the connecting holes. The left end of the connecting ring bar passes through the corresponding connecting hole on the left precast beam, and the right end passes through the corresponding connecting hole on the right precast beam. This invention provides a non-penetrating steel section connection node based on UHPC composite beams and columns and its construction method that can improve the connection strength between beams and columns.

Description

Technical Field

[0001] This invention relates to the field of precast beam and column concrete building construction technology, and in particular to a steel non-penetrating connection node and construction method based on UHPC composite beams and columns. Background Technology

[0002] With the development of modern construction and industrialization, there are more and more urban buildings. In common high-rise buildings and heavy-duty large-span buildings, steel-concrete composite beams and steel-concrete composite columns are often used together as a load-bearing composite structure. This structure has advantages such as high load-bearing capacity, good seismic performance, and good ductility. It can significantly reduce the cross-sectional size, increase the usable space of the building, and has good economic benefits and practical value. It is widely used in large public building projects and super high-rise projects.

[0003] Steel-reinforced UHPC composite beams and steel-tube UHPC composite columns are novel structural components proposed based on the superior material properties of UHPC and combined with prefabricated concrete construction methods. Existing connection nodes based on UHPC composite beams and columns include, for example, the connection node for a reinforced UHPC-core steel-tube concrete composite column and its design and construction method disclosed in Chinese Patent CN118498623A. This patent document discloses a connection node based on UHPC composite beams and columns, which includes precast columns and precast beams. The precast column includes, from the inside out, a core concrete core, a steel tube, and a reinforced UHPC. The reinforced UHPC includes a column reinforcement cage and a column UHPC cast integrally with the column reinforcement cage. The precast beam includes a beam reinforcement cage and a beam UHPC cast integrally with the beam reinforcement cage.

[0004] Precast columns include exposed steel pipes that are exposed during the precasting process. An outer ring steel plate is installed on the exposed steel pipe. When precast columns and precast beams need to be connected, the longitudinal bars of the beam reinforcement cage of the precast beam are welded to the outer ring steel plate. Then, concrete is poured around the exposed steel pipe, the outer ring steel plate, and the ends of the longitudinal bars of the precast beam to achieve the connection between the beam and the column.

[0005] The existing connection nodes rely solely on welding the longitudinal reinforcement to the outer ring steel plate to achieve the structural connection between columns and beams. Not only is it difficult to guarantee the connection strength, but the on-site welding and hole enlargement work is also extensive, which places high demands on construction quality and greatly increases the difficulty of construction. Summary of the Invention

[0006] The purpose of this invention is to provide a UHPC-based composite beam-column non-penetrating connection node that can improve the connection strength between beams and columns; the purpose of this invention is also to provide a construction method for this connection node.

[0007] To solve the above-mentioned technical problems, the present invention provides a technical solution for a UHPC-based composite beam-column non-penetrating connection node as follows:

[0008] A steel-framed, non-penetrating connection node based on UHPC composite beams and columns includes a steel pipe composite column and precast beams on the left and right sides of the steel pipe composite column. The steel pipe composite column includes vertically arranged steel pipes, a column reinforcement cage surrounding the steel pipes, and precast column concrete cast and fixed integrally with the steel pipes and column reinforcement cage. Both the left and right precast beams include beam reinforcement cages and precast beam concrete cast and fixed integrally with the beam reinforcement cages. The column reinforcement cage includes precast beams located on the left and right precast beams. The precast exposed steel reinforcement cage section between the beams includes a precast exposed steel pipe section passing through the center of the precast exposed steel reinforcement cage section. The precast exposed steel pipe section is provided with an upper connecting ring and a lower connecting ring. The lower longitudinal reinforcement of the beam reinforcement cage of the left precast beam has a first exposed lower longitudinal reinforcement section extending to the right and welded to the lower connecting ring. The lower longitudinal reinforcement of the right precast beam has a second exposed lower longitudinal reinforcement section extending to the left and welded to the lower connecting ring. The beam reinforcement cage of the left and right precast beams includes an exposed upper... The longitudinal reinforcement and the stirrups of the beam reinforcement cage have exposed ends that connect to the upper longitudinal reinforcement. The left and right precast beams also include steel sections that are cast and fixed to the corresponding precast beam concrete to form an integral structure. One end of the steel section includes an upper flange plate, a lower flange plate, and an intermediate web plate connecting the upper and lower flange plates. The lower flange plate is located inside the precast beam concrete, and the upper flange plate is located on the upper side of the precast beam concrete. A vertical connecting steel plate is welded and fixed to the upper side of the upper flange plate. Multiple connecting plates are spaced apart along the left and right direction on the vertical connecting steel plate. The connection node also includes a connecting ring bar corresponding to the connection hole. The left end of the connecting ring bar passes through the corresponding connection hole on the left precast beam, and the right end of the connecting ring bar passes through the corresponding connection hole on the right precast beam. The precast exposed steel pipe section is located inside the connecting ring bar. The exposed ends of the stirrups of the left and right precast beams, the upper longitudinal bars of the left and right precast beams, the exposed ends of the first and second lower longitudinal bars, and the exposed ends of the precast exposed steel pipe section and the precast exposed steel reinforcement skeleton section are surrounded by post-cast UHPC concrete.

[0009] Furthermore, the connecting ring reinforcement is a square ring reinforcement composed of connecting longitudinal reinforcement and connecting transverse reinforcement, with the connecting transverse reinforcement passing through the corresponding connecting holes.

[0010] Furthermore, the connecting ring reinforcements are arranged sequentially from the inside to the outside.

[0011] Furthermore, the right end of the web of the steel section of the left precast beam protrudes to the right from the precast concrete of the left precast beam, and a first stud extending in the left-right direction is fixed on the outward protruding end of the web of the steel section of the left precast beam; the left end of the web of the steel section of the right precast beam protrudes to the left from the precast concrete of the right precast beam, and a second stud extending in the left-right direction is fixed on the outward protruding end of the web of the steel section of the right precast beam. The outward protruding end of the web of the steel section of the left precast beam, the first stud, the outward protruding end of the web of the steel section of the right precast beam, and the second stud are cast and fixed together with the post-cast UHPC concrete to form an integral structure.

[0012] Furthermore, the steel pipe composite column also includes a left-side support bracket and a right-side support bracket integrally formed with the precast column concrete. The left-side support bracket is located directly below the outwardly convex end of the web of the steel section of the left precast beam, and the right-side support bracket is located directly below the outwardly convex end of the web of the steel section of the right precast beam.

[0013] Furthermore, the precast concrete of both the left and right precast beams includes a solid end adjacent to the steel pipe composite column and a U-shaped hollow section away from the steel pipe composite column. The upper flange of the steel section is located above the solid end. The steel section also includes an inverted T-shaped section. The bottom flange of the inverted T-shaped section is cast integrally with the precast beam concrete. The upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section. Multiple third studs are fixed at the upper end of the middle web of the inverted T-shaped section, which are spaced apart in the left and right direction. The upper end of the middle web of the inverted T-shaped section and the third studs are cast and fixed integrally with the post-cast UHPC concrete.

[0014] The technical solution of the construction method in this invention is as follows:

[0015] The first step involves the factory fabricating steel pipe composite columns, a left-side precast beam, and a right-side precast beam. The steel pipe composite column comprises vertically arranged steel pipes, a column reinforcement cage surrounding the steel pipes, and precast concrete that is cast and fixed integrally with the steel pipes and column reinforcement cage. Both the left-side and right-side precast beams include a beam reinforcement cage and precast concrete that is cast and fixed integrally with the beam reinforcement cage. The column reinforcement cage includes a precast exposed reinforcement cage segment located between the left and right precast beams. The steel pipe includes a precast exposed steel pipe segment passing through the center of the precast exposed reinforcement cage segment, and the precast exposed steel pipe segment is equipped with an upper and lower connecting ring.

[0016] The lower longitudinal reinforcement of the precast beam on the left side has a first exposed section extending to the right, and the lower longitudinal reinforcement of the precast beam on the right side has a second exposed section extending to the left. The beam reinforcement cage of both the left and right precast beams includes exposed upper longitudinal reinforcement. The upper ends of the stirrups in the beam reinforcement cage are exposed ends connected to the upper longitudinal reinforcement. The left and right precast beams also include steel sections cast and fixed to the corresponding precast beam concrete to form an integral structure. One end of the steel section includes an upper flange plate, a lower flange plate, and an intermediate web plate connecting the upper and lower flange plates. The lower flange plate is located inside the precast beam concrete, and the upper flange plate is located above the precast beam concrete. A vertical connecting steel plate is welded and fixed to the upper side of the upper flange plate. The vertical connecting steel plate has multiple connecting holes spaced apart in the left-right direction.

[0017] The right end of the web of the steel section of the left precast beam protrudes to the right from the precast concrete of the left precast beam, and a first stud extending along the left-right axis is fixed to the convex end of the web of the steel section of the left precast beam; the left end of the web of the steel section of the right precast beam protrudes to the left from the precast concrete of the right precast beam, and a second stud extending along the left-right axis is fixed to the convex end of the web of the steel section of the right precast beam.

[0018] The precast concrete of both the left and right precast beams includes a solid end adjacent to the steel pipe composite column and a U-shaped hollow section away from the steel pipe composite column. The upper flange of the steel section is located on the upper side of the solid end. The steel section also includes an inverted T-shaped section. The bottom flange of the inverted T-shaped section is cast into an integral structure with the precast beam concrete. The upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section. Multiple third studs are fixed at the upper end of the middle web of the inverted T-shaped section at intervals along the left and right directions.

[0019] The second step, at the construction site, involves welding the exposed sections of the first lower longitudinal reinforcement of the left precast beam and the second lower longitudinal reinforcement of the right precast beam to the lower connecting ring; the right end of the upper longitudinal reinforcement of the left precast beam is welded to the upper connecting ring, and the left end of the upper longitudinal reinforcement of the right precast beam is welded to the upper connecting ring.

[0020] The left end of each connecting ring bar is inserted into the corresponding connecting hole on the left precast beam, and the right end of each connecting ring bar is inserted into the corresponding connecting hole on the right precast beam. The connecting ring bars are then tied and fixed to the exposed beam reinforcement cage of the left and right precast beams.

[0021] The third step involves pouring post-cast UHPC concrete. This post-cast UHPC concrete is then poured and fixed to the exposed ends of the stirrups of the left and right precast beams, the upper longitudinal reinforcement of the left and right precast beams, the exposed ends of the first and second lower longitudinal reinforcements, forming a monolithic structure. Finally, the post-cast UHPC concrete is poured and fixed to the protruding ends of the web of the steel section of the left precast beam, the first stud, the protruding ends of the web of the steel section of the right precast beam, and the second stud, forming a monolithic structure. Finally, the post-cast UHPC concrete is poured and fixed to the upper middle web of the inverted T-shaped section and the third stud, forming a monolithic structure.

[0022] UHPC center concrete was poured into the inner hole of the steel pipe of the steel pipe composite column.

[0023] The beneficial effects of this invention are as follows: In this invention, due to the good compressive and tensile properties of UHPC, the connection between the steel section and the steel pipe is eliminated. The shear force of the web is transferred by the studs on the web of the steel section, and the flange bending moment is transferred by the vertical connecting steel plates and connecting ring bars on the flange plates of the steel section. This avoids the collision between the reinforcing bars and the steel section and the steel pipe. The longitudinal bars of the column reinforcement skeleton of the steel pipe composite column can be continuous from top to bottom, avoiding the perforation of the steel pipe, effectively preventing the buckling of the steel pipe column, and effectively improving the overall stability of the joint area. Attached Figure Description

[0024] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding portions, wherein:

[0025] Figure 1 This is a structural schematic diagram of an embodiment of a UHPC-based composite beam-column non-penetrating connection node in this invention;

[0026] Figure 2 yes Figure 1 A schematic diagram showing the connection between the precast beam on the left side and the connecting ring reinforcement.

[0027] Figure 3 yes Figure 1 Schematic diagram of the structure of the steel pipe;

[0028] Figure 4 yes Figure 1 A schematic diagram of the steel structure of the precast beam on the left side of the middle section;

[0029] Figure 5 yes Figure 4 A three-dimensional image;

[0030] Figure 6 yes Figure 1 A schematic diagram showing the state of concrete after transparent treatment.

[0031] 1. Steel pipe composite column; 2. Steel section; 3. Upper longitudinal reinforcement; 4. First stud; 5. Stirrups of beam reinforcement cage; 6. Steel pipe; 7. UHPC center concrete; 8. Connecting ring; 9. Upper flange plate; 10. Vertical connecting steel plate; 11. Connecting ring reinforcement; 12. Outwardly protruding end of the web of the steel section of the left precast beam; 13. Solid end; 14. Left supporting corbel; 15. Post-cast UHPC concrete; 16. Left precast beam; 17. Right precast beam; 18. Longitudinal reinforcement of column reinforcement cage; 19. Precast exposed reinforcement cage section; 20. Precast exposed steel pipe section; 21. Column reinforcement cage; 22. Precast column concrete; 23. Precast beam concrete; 24. U-shaped hollow section; 25. Inverted T-shaped section; 26. Third stud; 27. Web of the steel section of the left precast beam; 28. Lower flange plate; 29. ​​Connecting hole. Detailed Implementation

[0032] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0033] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0034] An example of an implementation of a UHPC-based composite beam-column non-penetrating connection node in this invention is shown below. Figures 1-6 As shown:

[0035] The system includes a steel pipe composite column 1 and precast beams 16 on the left and 17 on the right, located on either side of the column. The steel pipe composite column 1 comprises vertically arranged steel pipes 6, a column reinforcement cage 21 surrounding the steel pipes, and precast column concrete 22. The precast column concrete 22 is cast and fixed integrally with the steel pipes 6 and the column reinforcement cage 21. Both the left and right precast beams include a beam reinforcement cage and precast beam concrete 23 cast and fixed integrally with it. The steel pipe composite column 1 also includes a left-side support bracket 14 and a right-side support bracket integrally formed with the precast column concrete 22.

[0036] Both column and beam steel reinforcement cages are existing technologies, which include longitudinal bars and stirrups tied to the longitudinal bars. The longitudinal bars of the column steel reinforcement cage are vertically arranged column longitudinal bars, and the longitudinal bars of the beam steel reinforcement cage are horizontally arranged longitudinal bars. The longitudinal bars include upper longitudinal bars 3 and lower longitudinal bars. Item 5 in the figure represents the stirrups of the beam steel reinforcement cage.

[0037] The column reinforcement cage includes a precast exposed reinforcement cage section 19 located between the left precast beam and the right precast beam, and the steel pipe includes a precast exposed steel pipe section 20 passing through the center of the precast exposed reinforcement cage section. The precast exposed steel pipe section 20 is provided with two connecting rings 8 spaced apart vertically, namely the upper connecting ring and the lower connecting ring.

[0038] The lower longitudinal reinforcement of the precast beam on the left side has a first exposed section of the lower longitudinal reinforcement extending to the right and welded to the lower connecting ring. The lower longitudinal reinforcement of the precast beam on the right side has a second exposed section of the lower longitudinal reinforcement extending to the left and welded to the lower connecting ring. The beam reinforcement cages of the precast beams on the left and right sides include exposed upper longitudinal reinforcement 3. The upper end of the stirrups 5 of the beam reinforcement cage is an exposed end of the stirrup connected to the upper longitudinal reinforcement.

[0039] The left and right precast beams also include steel sections 2 that are cast and fixed integrally with the corresponding precast beam concrete. The right end of the steel section includes an upper flange plate 9, a lower flange plate 28, and a web connecting the upper and lower flange plates. Item 27 in the figure represents the web of the steel section of the left precast beam. The lower flange plate is located inside the precast beam concrete, and the upper flange plate 9 is located above the precast beam concrete. A vertical connecting steel plate 10 is welded and fixed to the upper side of the upper flange plate 9. The vertical connecting steel plate 10 has multiple connecting holes 29 spaced apart in the left-right direction. The connection node also includes connecting ring bars 11 corresponding to the connecting holes. The connecting ring bars are made of high-strength steel bars. In this embodiment, the connecting ring bars are square structures. The left end of the connecting ring bar 11 passes through the corresponding connecting hole 29 on the left precast beam, and the right end of the connecting ring bar passes through the corresponding connecting hole 29 on the right precast beam. The connecting ring bars 11 are tied and fixed to the upper end of the beam reinforcement skeleton of the left and right precast beams.

[0040] In this embodiment, the connecting ring reinforcement is a square ring reinforcement composed of connecting longitudinal reinforcement and connecting transverse reinforcement, with the connecting transverse reinforcement passing through the corresponding connecting holes. The connecting ring reinforcements are arranged sequentially from the inside to the outside.

[0041] The right end of the web of the steel section of the left precast beam protrudes to the right from the precast concrete of the left precast beam. A first stud 4 extending in the left-right direction is fixed on the protruding end 12 of the web of the steel section of the left precast beam. The left end of the web of the steel section of the right precast beam protrudes to the left from the precast concrete of the right precast beam. A second stud extending in the left-right direction is fixed on the protruding end of the web of the steel section of the right precast beam. That is to say, before the post-cast UHPC concrete is poured, the protruding end of the web and the corresponding first stud are also exposed. In this embodiment, "exposed" refers to the exposure before the post-cast UHPC concrete is poured. After the post-cast UHPC concrete is poured, the exposed positions are no longer exposed.

[0042] The left support bracket 14 is located directly below the outwardly convex end of the web of the steel section of the left precast beam, and the right support bracket is located directly below the outwardly convex end of the web of the steel section of the right precast beam.

[0043] Both the left and right precast beams consist of a solid end 13 adjacent to the steel pipe composite column and a U-shaped hollow section 24 away from the steel pipe composite column. The upper flange of the steel section is located above the solid end. The end of the steel section away from the steel pipe composite column is an inverted T-shaped section. The bottom flange of the inverted T-shaped section is cast integrally with the precast beam concrete 23. The upper end of the web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section. Multiple third studs 26 are fixed at the upper end of the middle web of the inverted T-shaped section, spaced apart in the left-right direction. The upper end of the middle web of the inverted T-shaped section, the third studs, and the post-cast UHPC concrete are cast and fixed into an integral structure. That is, in this embodiment, the end of the steel section near the steel pipe composite column is an H-shaped structure, and the end of the steel section away from the steel pipe composite column is an inverted T-shaped structure. The steel section is a one-piece molded structure. During its manufacture, the upper flange of the left end of the H-shaped steel section can be cut off to form the steel section.

[0044] At the construction site, the exposed section of the first lower longitudinal reinforcement of the left precast beam and the exposed section of the second lower longitudinal reinforcement of the right precast beam are welded to the lower connecting ring; the right end of the upper longitudinal reinforcement of the left precast beam is welded to the upper connecting ring, and the left end of the upper longitudinal reinforcement of the right precast beam is welded to the upper connecting ring.

[0045] The left end of each connecting ring bar is inserted into the corresponding connecting hole on the left precast beam, and the right end of each connecting ring bar is inserted into the corresponding connecting hole on the right precast beam. The connecting ring bars are then tied and fixed to the exposed beam reinforcement cage of the left and right precast beams.

[0046] Then, post-cast UHPC concrete 15 is poured, and UHPC center concrete 7 is poured into the inner hole of the steel pipe of the steel pipe composite column. The post-cast UHPC concrete is poured and fixed to the exposed ends of the stirrups of the left and right precast beams, the upper longitudinal bars of the left and right precast beams, the exposed ends of the first and second lower longitudinal bars to form an integral structure. The post-cast UHPC concrete is poured and fixed to the protruding ends of the web of the steel section of the left precast beam, the first stud, the protruding ends of the web of the steel section of the right precast beam, and the second stud to form an integral structure. The post-cast UHPC concrete is poured and fixed to the upper part of the middle web of the inverted T-shaped section and the third stud to form an integral structure. The left and right supporting brackets provide auxiliary support for the post-cast UHPC concrete.

[0047] In this invention, the steel sections of the precast beams on the left and right sides do not penetrate the steel pipes of the steel pipe composite column, so they can be called penetration-free connection nodes.

[0048] In the positive bending moment zone, both the left and right precast beams use inverted T-shaped steel sections. Third studs are welded to the top two sides of the inverted T-section to ensure the coordinated working ability between the steel sections and the post-cast UHPC concrete. In the negative bending moment zone, H-beams are used, with vertical connecting steel plates welded to the upper flange plates. High-strength steel connecting rings pass through the vertical connecting steel plates to form a steel ring that connects to the composite beam on the symmetrical plane, allowing the steel flange to transfer loads to the beams or columns on the symmetrical plane. For multi-story buildings not exceeding 40m, where vertical loads dominate, under seismic loads, the negative bending moment at the upper ends of the columns is greater than the positive bending moment. In this case, only vertical connecting steel plates and connecting rings need to be installed on the upper flange plates of the steel sections. For high-rise buildings exceeding 40m, where seismic loads dominate, the negative bending moment at the ends of the columns may be less than the positive bending moment. In this case, to ensure structural safety and reliable transfer of internal forces, vertical connecting steel plates and connecting rings need to be installed at the same location on the lower flange plates of the steel sections.

[0049] The convex ends of the web plates of the steel sections of the precast beams on the left and right extend to the core area of ​​the beam-column joint. The first and second studs are welded to both sides of the web plates of the steel sections to effectively transfer the shear force at the beam ends. At the same time, the precast beams on the left and right adopt U-shaped hollow sections with hollow cross sections. Setting a certain length of solid ends at the ends of the precast beams on the left and right can effectively improve the stiffness and shear bearing capacity of the core area of ​​the joint, realizing "strong joint and weak member".

[0050] Because UHPC has extremely high compressive strength, good toughness and ductility, after the steel UHPC composite beam and the steel pipe UHPC composite column are lapped and assembled, UHPC is poured in the overlapping area to form a whole, which improves the structural ability to deform together and exhibits high load-bearing capacity and ductility.

[0051] Compared with the prior art, the present invention has the following significant effects:

[0052] 1. The prefabricated building connection node of the present invention is easy to install, requires less on-site welding, and is boltless throughout the entire process, which helps to reduce the accuracy requirements and difficulty of construction and improve installation and construction efficiency.

[0053] 2. The prefabricated building connection node components of this invention have a high degree of prefabrication. The steel pipes, connecting rings, and the UHPC reinforcement (including the column reinforcement skeleton and precast column concrete) around the steel pipes in the steel pipe composite column can be prefabricated in the factory, while the UHPC core concrete inside the steel pipe is poured on site. The UHPC reinforcement, steel profiles, and studs in the left and right precast beams can be prefabricated in the factory, transported to the construction site for reliable connection, and the pouring of the node and beam composite UHPC not only simplifies the on-site construction process but also effectively reduces environmental pollution.

[0054] 3. The prefabricated building connection node of the present invention is integrally cast with UHPC. Due to the excellent mechanical properties of UHPC, it has stronger compressive strength, tensile strength and bonding ability compared with ordinary concrete, which helps to increase the shear strength and stiffness of the node.

[0055] 4. In the prefabricated building connection node of the present invention, due to the good compressive and tensile properties of UHPC, the connection between the steel section and the steel pipe is eliminated. The web shear force is transferred by welding studs to the web plate of the steel section, and the flange bending moment is transferred by welding perforated steel plates and perforated high-strength steel bars to the flange plate. This avoids the steel bars from colliding with the steel section and the steel pipe. The vertical steel bars in the column can be connected vertically, avoiding the perforation of the steel pipe, effectively preventing the buckling of the steel pipe column, and effectively improving the overall stability of the node area.

[0056] The implementation of the construction method for the above-mentioned connection nodes in this invention is as follows: Figures 1-6 As shown:

[0057] A construction method for the above-mentioned connection nodes,

[0058] The construction method includes the following steps: First, the steel pipe composite column, the left precast beam, and the right precast beam are fabricated in a factory. The steel pipe composite column includes vertically arranged steel pipes, a column reinforcement cage surrounding the steel pipes, and precast column concrete cast and fixed integrally with the steel pipes and column reinforcement cage. Both the left and right precast beams include a beam reinforcement cage and precast beam concrete cast and fixed integrally with the beam reinforcement cage. The column reinforcement cage includes a precast exposed reinforcement cage segment located between the left and right precast beams. The steel pipe includes a precast exposed steel pipe segment passing through the center of the precast exposed reinforcement cage segment, with an upper connecting ring and a lower connecting ring on the precast exposed steel pipe segment.

[0059] The lower longitudinal reinforcement of the precast beam on the left side has a first exposed section extending to the right, and the lower longitudinal reinforcement of the precast beam on the right side has a second exposed section extending to the left. The beam reinforcement cage of both the left and right precast beams includes exposed upper longitudinal reinforcement. The upper ends of the stirrups in the beam reinforcement cage are exposed ends connected to the upper longitudinal reinforcement. The left and right precast beams also include steel sections cast and fixed to the corresponding precast beam concrete to form an integral structure. One end of the steel section includes an upper flange plate, a lower flange plate, and an intermediate web plate connecting the upper and lower flange plates. The lower flange plate is located inside the precast beam concrete, and the upper flange plate is located above the precast beam concrete. A vertical connecting steel plate is welded and fixed to the upper side of the upper flange plate. The vertical connecting steel plate has multiple connecting holes spaced apart in the left-right direction.

[0060] The right end of the web of the steel section of the left precast beam protrudes to the right from the precast concrete of the left precast beam, and a first stud extending along the left-right axis is fixed to the convex end of the web of the steel section of the left precast beam; the left end of the web of the steel section of the right precast beam protrudes to the left from the precast concrete of the right precast beam, and a second stud extending along the left-right axis is fixed to the convex end of the web of the steel section of the right precast beam.

[0061] The precast concrete of both the left and right precast beams includes a solid end adjacent to the steel pipe composite column and a U-shaped hollow section away from the steel pipe composite column. The upper flange of the steel section is located on the upper side of the solid end. The steel section also includes an inverted T-shaped section. The bottom flange of the inverted T-shaped section is cast into an integral structure with the precast beam concrete. The upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section. Multiple third studs are fixed at the upper end of the middle web of the inverted T-shaped section at intervals along the left and right directions.

[0062] The second step, at the construction site, involves welding the exposed sections of the first lower longitudinal reinforcement of the left precast beam and the second lower longitudinal reinforcement of the right precast beam to the lower connecting ring; the right end of the upper longitudinal reinforcement of the left precast beam is welded to the upper connecting ring, and the left end of the upper longitudinal reinforcement of the right precast beam is welded to the upper connecting ring.

[0063] The left end of each connecting ring bar is inserted into the corresponding connecting hole on the left precast beam, and the right end of each connecting ring bar is inserted into the corresponding connecting hole on the right precast beam. The connecting ring bars are then tied and fixed to the exposed beam reinforcement cage of the left and right precast beams.

[0064] The third step involves pouring post-cast UHPC concrete. This post-cast UHPC concrete is then poured and fixed to the exposed ends of the stirrups of the left and right precast beams, the upper longitudinal reinforcement of the left and right precast beams, the exposed ends of the first and second lower longitudinal reinforcements, forming a monolithic structure. Finally, the post-cast UHPC concrete is poured and fixed to the protruding ends of the web of the steel section of the left precast beam, the first stud, the protruding ends of the web of the steel section of the right precast beam, and the second stud, forming a monolithic structure. Finally, the post-cast UHPC concrete is poured and fixed to the upper middle web of the inverted T-shaped section and the third stud, forming a monolithic structure.

[0065] UHPC center concrete was poured into the inner hole of the steel pipe of the steel pipe composite column.

[0066] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0067] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the devices or elements involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0068] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel-framed, non-penetrating connection node based on UHPC composite beams and columns, comprising a steel pipe composite column and a left-side precast beam and a right-side precast beam disposed on the left and right sides of the steel pipe composite column, wherein the steel pipe composite column comprises a vertically arranged steel pipe, a column reinforcement cage disposed around the steel pipe, and precast column concrete cast and fixed integrally with the steel pipe and column reinforcement cage, and both the left-side and right-side precast beams comprise a beam reinforcement cage and precast beam concrete cast and fixed integrally with the beam reinforcement cage, characterized in that: The column reinforcement cage includes a precast exposed reinforcement cage segment located between the left and right precast beams. The steel pipe includes a precast exposed steel pipe segment passing through the center of the precast exposed reinforcement cage segment. The precast exposed steel pipe segment is equipped with an upper connecting ring and a lower connecting ring. The lower longitudinal reinforcement of the left precast beam has a first exposed lower longitudinal reinforcement segment extending to the right and welded to the lower connecting ring. The lower longitudinal reinforcement of the right precast beam has a second exposed lower longitudinal reinforcement segment extending to the left and welded to the lower connecting ring. The beam reinforcement cages of the left and right precast beams include exposed upper longitudinal reinforcement. The upper ends of the stirrups in the beam reinforcement cage are exposed ends connected to the upper longitudinal reinforcement. The left and right precast beams also include structural steel sections cast and fixed integrally with the corresponding precast beam concrete. One end of the structural steel section includes an upper flange and a lower flange. The precast beam has a flange and an intermediate web connecting the upper flange and the lower flange. The lower flange is located inside the precast beam concrete, and the upper flange is located above the precast beam concrete. A vertical connecting steel plate is welded and fixed to the upper side of the upper flange. The vertical connecting steel plate has multiple connecting holes spaced apart in the left and right directions. The connection node also includes connecting ring bars corresponding to the connecting holes. The left end of the connecting ring bar passes through the corresponding connecting hole on the left precast beam, and the right end of the connecting ring bar passes through the corresponding connecting hole on the right precast beam. The precast exposed steel pipe section is located inside the connecting ring bar. The exposed ends of the stirrups of the left and right precast beams, the upper longitudinal bars of the left and right precast beams, the exposed sections of the first and second lower longitudinal bars, and the precast exposed steel pipe section and the precast exposed steel reinforcement skeleton section are surrounded by post-cast UHPC concrete.

2. The connection node according to claim 1, characterized in that: The connecting ring reinforcement is a square ring reinforcement composed of connecting longitudinal reinforcement and connecting transverse reinforcement, with the connecting transverse reinforcement passing through the corresponding connecting holes.

3. The connection node according to claim 1, characterized in that: Each connecting ring reinforcement is installed sequentially from the inside to the outside.

4. The connection node according to claim 1, characterized in that: The right end of the web of the steel section of the left precast beam protrudes to the right from the precast concrete of the left precast beam. A first stud with an axis extending in the front-back direction is fixed on the protruding end of the web of the steel section of the left precast beam. The left end of the web of the steel section of the right precast beam protrudes to the left from the precast concrete of the right precast beam. A second stud with an axis extending in the front-back direction is fixed on the protruding end of the web of the steel section of the right precast beam. The protruding end of the web of the steel section of the left precast beam, the first stud, the protruding end of the web of the steel section of the right precast beam, and the second stud are fixed together with the post-cast UHPC concrete to form an integral structure.

5. The connection node according to claim 4, characterized in that: The steel pipe composite column also includes a left-side support bracket and a right-side support bracket integrally formed with the precast column concrete. The left-side support bracket is located directly below the outwardly convex end of the web of the steel section of the left precast beam, and the right-side support bracket is located directly below the outwardly convex end of the web of the steel section of the right precast beam.

6. The connection node according to any one of claims 1 to 5, characterized in that: Both the left and right precast beams consist of a solid end adjacent to the steel pipe composite column and a U-shaped hollow section away from the steel pipe composite column. The upper flange of the steel section is located above the solid end. The steel section also includes an inverted T-shaped section. The bottom flange of the inverted T-shaped section is cast integrally with the precast beam concrete. The upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section. Multiple third studs are fixed at the upper end of the middle web of the inverted T-shaped section, spaced apart in the left and right direction. The upper end of the middle web of the inverted T-shaped section and the third studs are cast and fixed integrally with the post-cast UHPC concrete.

7. A construction method for a connection node as described in any one of claims 1 to 6, characterized in that: The construction method includes the following steps: First, the steel pipe composite column, the left precast beam, and the right precast beam are fabricated in a factory. The steel pipe composite column includes vertically arranged steel pipes, a column reinforcement cage surrounding the steel pipes, and precast column concrete cast and fixed integrally with the steel pipes and column reinforcement cage. Both the left and right precast beams include a beam reinforcement cage and precast beam concrete cast and fixed integrally with the beam reinforcement cage. The column reinforcement cage includes a precast exposed reinforcement cage segment located between the left and right precast beams. The steel pipe includes a precast exposed steel pipe segment passing through the center of the precast exposed reinforcement cage segment, with an upper connecting ring and a lower connecting ring on the precast exposed steel pipe segment. The lower longitudinal reinforcement of the precast beam on the left side has a first exposed section extending to the right, and the lower longitudinal reinforcement of the precast beam on the right side has a second exposed section extending to the left. The beam reinforcement cage of both the left and right precast beams includes exposed upper longitudinal reinforcement. The upper ends of the stirrups in the beam reinforcement cage are exposed ends connected to the upper longitudinal reinforcement. The left and right precast beams also include steel sections cast and fixed to the corresponding precast beam concrete to form an integral structure. One end of the steel section includes an upper flange plate, a lower flange plate, and an intermediate web plate connecting the upper and lower flange plates. The lower flange plate is located inside the precast beam concrete, and the upper flange plate is located above the precast beam concrete. A vertical connecting steel plate is welded and fixed to the upper side of the upper flange plate. The vertical connecting steel plate has multiple connecting holes spaced apart in the left-right direction. The right end of the web of the steel section of the left precast beam protrudes to the right from the precast concrete of the left precast beam, and a first stud extending along the front-rear direction is fixed to the convex end of the web of the steel section of the left precast beam; the left end of the web of the steel section of the right precast beam protrudes to the left from the precast concrete of the right precast beam, and a second stud extending along the front-rear direction is fixed to the convex end of the web of the steel section of the right precast beam. The precast concrete of both the left and right precast beams includes a solid end adjacent to the steel pipe composite column and a U-shaped hollow section away from the steel pipe composite column. The upper flange of the steel section is located on the upper side of the solid end. The steel section also includes an inverted T-shaped section. The bottom flange of the inverted T-shaped section is cast into an integral structure with the precast beam concrete. The upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section. Multiple third studs are fixed at the upper end of the middle web of the inverted T-shaped section at intervals along the left and right directions. The second step involves welding the exposed sections of the first lower longitudinal reinforcement bars of the left precast beam and the second lower longitudinal reinforcement bars of the right precast beam to the lower connecting rings at the construction site. The right end of the upper longitudinal reinforcement bars of the left precast beam is welded to the upper connecting ring, and the left end of the upper longitudinal reinforcement bars of the right precast beam is welded to the upper connecting ring. The left end of each connecting ring bar is inserted into the corresponding connecting hole on the left precast beam, and the right end of each connecting ring bar is inserted into the corresponding connecting hole on the right precast beam. The connecting ring bars are then tied and fixed to the exposed beam reinforcement cage of the left and right precast beams. The third step involves pouring post-cast UHPC concrete. This post-cast UHPC concrete is then poured and fixed to the exposed ends of the stirrups of the left and right precast beams, the upper longitudinal reinforcement of the left and right precast beams, the exposed sections of the first and second lower longitudinal reinforcements, forming an integral structure. Finally, the post-cast UHPC concrete is poured and fixed to the protruding ends of the web of the steel section of the left precast beam, the first stud, the protruding ends of the web of the steel section of the right precast beam, and the second stud, forming an integral structure. Finally, the post-cast UHPC concrete is poured and fixed to the upper middle web of the inverted T-shaped section and the third stud, forming an integral structure. UHPC center concrete was poured into the inner hole of the steel pipe of the steel pipe composite column.

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