Profile steel penetration-free type connecting joint based on UHPC composite beam and column and construction method

Abstract

The invention relates to a profile steel penetration-free type connecting joint based on UHPC composite beams and columns and a construction method. A left side precast beam and a right side precast beam of the connecting joint further comprise profile steel which is fixed to the corresponding precast beams in a concrete pouring mode to form an integral structure. One end of the profile steel comprises an upper flange plate, a lower flange plate and a middle web plate connected between the upper flange plate and the lower flange plate, the lower flange plate is located on the inner side of the precast beam concrete, the upper flange plate is located on the upper side of the precast beam concrete, and a vertical connecting steel plate is fixedly welded to the upper side of the upper flange plate; the vertical connecting steel plate is provided with a plurality of connecting holes arranged at intervals in the left-right direction, the connecting joint further comprises connecting ring ribs corresponding to the connecting holes, the left ends of the connecting ring ribs are installed in the corresponding connecting holes in the left side precast beam in a penetrating mode, and the right ends of the connecting ring ribs are installed in the corresponding connecting holes in the right side precast beam in a penetrating mode. According to the UHPC-based composite beam and column penetration-free type connecting joint and the construction method, the connecting strength between the beam and the column can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated beam and column concrete building construction, and in particular to a steel-free penetration connection node based on UHPC composite beams and columns and a construction method. Background Art

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

[0003] Steel UHPC composite beams and steel tube UHPC composite columns are a new type of structural component proposed based on the excellent material properties of UHPC and combined with the prefabricated concrete construction method. The existing connection nodes based on UHPC composite beams and columns are disclosed in Chinese patent CN118498623A, "A reinforced UHPC-core steel tube concrete composite column and its design and construction method". This patent document discloses a connection node based on UHPC composite beams and columns, which includes prefabricated columns and prefabricated beams. The prefabricated columns include core concrete, steel tubes and reinforced UHPC arranged in sequence from the inside to the outside. The reinforced UHPC includes a column reinforcement cage and a column UHPC cast into an integral structure with the column reinforcement cage. The prefabricated beam includes a beam reinforcement cage and a beam UHPC cast into an integral structure with the beam reinforcement cage.

[0004] The prefabricated column includes an exposed steel pipe exposed during the prefabrication process, and an outer ring steel plate is arranged on the exposed steel pipe. When the prefabricated column and the prefabricated beam need to be connected, the longitudinal reinforcement of the beam reinforcement cage of the prefabricated beam is welded to the outer ring steel plate, and then the post-pour concrete is poured around the exposed steel pipe, the outer ring steel plate and the end of the longitudinal reinforcement of the prefabricated beam, so as to realize the connection between the beam and the column.

[0005] This existing connection node only relies on the welding of longitudinal reinforcement and outer ring steel plate to achieve the structural connection between columns and beams. Not only is the connection strength difficult to ensure, but the on-site construction welding and hole expansion operations are large, which has high requirements on construction quality and greatly increases the difficulty of construction. Summary of the invention

[0006] The object of the present invention is to provide a UHPC-based composite beam-column non-penetration type connection node capable of improving the connection strength between beams and columns; the object of the present invention is also to provide a construction method for the connection node.

[0007] In order to solve the above technical problems, a technical solution of a UHPC-based composite beam-column non-penetration type connection node in the present invention is as follows: A steel-free penetration connection node based on UHPC composite beams and columns, comprising a steel tube composite column and a left precast beam and a right precast beam arranged on the left and right sides of the steel tube composite column, wherein the steel tube composite column comprises a vertically arranged steel tube, a column reinforcement skeleton arranged on the outer periphery of the steel tube, and a precast column concrete that is cast and fixed with the steel tube and the column reinforcement skeleton to form an integral structure, the left precast beam and the right precast beam both comprise a beam reinforcement skeleton and a precast beam concrete that is cast and fixed with the beam reinforcement skeleton to form an integral structure, and the column reinforcement skeleton comprises a steel tube on the left precast beam and a steel tube on the right precast beam. The steel pipe comprises a prefabricated exposed steel pipe section passing through the center of the prefabricated exposed steel pipe section, and the prefabricated exposed steel pipe section is provided with an upper connecting ring and a lower connecting ring. The lower longitudinal reinforcement of the beam reinforcement skeleton of the left prefabricated beam has a first lower longitudinal reinforcement exposed section extending outward to the right and connected to the lower connecting ring by welding, and the lower longitudinal reinforcement of the right prefabricated beam has a second lower longitudinal reinforcement exposed section extending outward to the left and connected to the lower connecting ring by welding. The beam reinforcement skeletons of the left prefabricated beam and the right prefabricated beam include an exposed upper The upper end of the stirrup of the longitudinal reinforcement and the beam reinforcement skeleton is the exposed end of the stirrup connected to the upper longitudinal reinforcement. The left precast beam and the right precast beam also include a steel section that is cast and fixed with 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 connected between the upper flange plate and the lower flange plate. The lower flange plate is located on the inner side of 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 on the upper side of the upper flange plate. A plurality of connecting plates arranged at intervals along the left and right directions are provided on the vertical connecting steel plate. The connection node also includes a connection ring reinforcement corresponding to the connection hole, the left end of the connection ring reinforcement is installed in the corresponding connection hole on the left precast beam, and the right end of the connection ring reinforcement is installed in the corresponding connection hole on the right precast beam. The precast exposed steel pipe section is located on the inner side of the connection ring reinforcement, the exposed ends of the stirrups of the left precast beam and the right precast beam, the upper longitudinal reinforcement of the left precast beam and the right precast beam, the exposed end of the first lower longitudinal reinforcement, the exposed end of the second lower longitudinal reinforcement, and the precast exposed steel pipe section and the precast exposed steel bar skeleton section are cast and fixed with post-cast UHPC concrete.

[0008] Furthermore, the connecting ring reinforcement is a square ring reinforcement composed of connecting longitudinal reinforcement and connecting transverse reinforcement, and the connecting transverse reinforcement is passed through the corresponding connecting hole.

[0009] Furthermore, the connecting ring ribs are arranged sequentially from the inside to the outside.

[0010] Furthermore, the right end of the web of the steel section of the left precast beam protrudes to the right from the precast beam concrete of the left precast beam, and a first bolt with an axis extending in the left-right direction is fixed to the outer 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 beam concrete of the right precast beam, and a second bolt with an axis extending in the left-right direction is fixed to the outer convex end of the web of the steel section of the right precast beam, and the outer convex end of the web of the steel section of the left precast beam, the first bolt, the outer convex end of the web of the steel section of the right precast beam and the second bolt are cast and fixed with the post-cast UHPC concrete to form an integral structure.

[0011] Furthermore, the steel tube composite column also includes a left supporting corbel and a right supporting corbel integrally formed with the precast column concrete. The left supporting corbel is located directly below the outer protruding end of the web of the steel section of the left precast beam, and the right supporting corbel is located directly below the outer protruding end of the web of the steel section of the right precast beam.

[0012] Furthermore, the precast beam concrete of the left precast beam and the right precast beam both include a solid end adjacent to the steel tube composite column and a U-shaped hollow section away from the steel tube composite column, the upper flange plate 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 plate of the inverted T-shaped section and the precast beam concrete are cast into an integral structure, the upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section, the upper end of the middle web of the inverted T-shaped section is fixed with a plurality of third bolts spaced apart in the left-right direction, the upper end of the middle web of the inverted T-shaped section and the third bolts are cast and fixed with the post-cast UHPC concrete into an integral structure.

[0013] The technical solution of the construction method in the present invention is: In the first step, the factory manufactures steel tube composite columns, left precast beams and right precast beams. The steel tube composite columns include vertically arranged steel tubes, column reinforcement skeletons arranged on the periphery of the steel tubes and precast column concrete that is cast and fixed with the steel tubes and column reinforcement skeletons to form an integral structure. The left precast beams and the right precast beams both include beam reinforcement skeletons and precast beam concrete that is cast and fixed with the beam reinforcement skeletons to form an integral structure. The column reinforcement skeleton includes a precast exposed reinforcement skeleton segment located between the left precast beams and the right precast beams. The steel tube includes a precast exposed steel tube segment that passes through the center of the precast exposed reinforcement skeleton segment. The precast exposed steel tube segment is provided with an upper connecting ring and a lower connecting ring. The lower longitudinal reinforcement of the beam reinforcement skeleton of the left precast beam has a first exposed section of the lower longitudinal reinforcement extending to the right, and the lower longitudinal reinforcement of the right precast beam has a second exposed section of the lower longitudinal reinforcement extending to the left. The beam reinforcement skeletons of the left precast beam and the right precast beam include exposed upper longitudinal reinforcements, and the upper ends of the stirrups of the beam reinforcement skeleton are exposed ends of the stirrups connected to the upper longitudinal reinforcements. The left precast beam and the right precast beam 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 connected between the upper flange plate and the lower flange plate, the lower flange plate is located on the inner side of the precast beam concrete, the upper flange plate is located on the upper side of the precast beam concrete, a vertical connecting steel plate is welded and fixed on the upper side of the upper flange plate, and a plurality of connecting holes arranged at intervals along the left and right directions are opened on the vertical connecting steel plate. The right end of the web of the steel section of the left precast beam protrudes to the right from the precast beam concrete of the left precast beam, and a first bolt with an axis extending in the left-right direction is fixed to the outer 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 beam concrete of the right precast beam, and a second bolt with an axis extending in the left-right direction is fixed to the outer convex end of the web of the steel section of the right precast beam. The precast beam concrete of the left precast beam and the right precast beam both include a solid end adjacent to the steel tube composite column and a U-shaped hollow section away from the steel tube composite column, the upper flange plate 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 plate of the inverted T-shaped section and the precast beam concrete are cast into an integral structure, the upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section, and a plurality of third bolts spaced apart in the left-right direction are fixed to the upper end of the middle web of the inverted T-shaped section; The second step is that at the construction site, the first exposed section of the lower longitudinal reinforcement of the left precast beam and the second exposed section of the 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. The left end of each connecting ring reinforcement is inserted into the corresponding connecting hole on the left precast beam, and the right end of each connecting ring reinforcement is inserted into the corresponding connecting hole on the right precast beam, and the connecting ring reinforcement is tied and fixed to the exposed beam reinforcement skeleton of the left precast beam and the right precast beam; The third step is to cast the post-cast UHPC concrete. The post-cast UHPC concrete and 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 lower longitudinal bars, and the exposed ends of the second lower longitudinal bars are cast and fixed into an integral structure. The post-cast UHPC concrete and the convex end of the web of the steel section of the left precast beam, the first stud, the convex end of the web of the steel section of the right precast beam, and the second stud are cast and fixed into an integral structure. The post-cast UHPC concrete and the upper end of the middle web of the inverted T-shaped section and the third stud are cast and fixed into an integral structure. Pour UHPC central concrete into the inner hole of the steel tube of the steel tube composite column.

[0014] The beneficial effects of the present invention are as follows: in the present invention, due to the good compressive and tensile properties of UHPC, the connection between the steel section and the steel pipe is cancelled, the web shear force is transmitted by the studs on the web of the steel section, and the flange bending moment is transmitted by the vertical connecting steel plates and connecting ring bars on the flange plates of the steel section, thereby avoiding the collision between the steel bars and the steel section and the steel pipe. The column longitudinal bars of the column steel reinforcement skeleton of the steel pipe composite column can pass through from top to bottom, thereby avoiding the perforation of the steel pipe, effectively avoiding the occurrence of buckling of the steel pipe column, and effectively improving the overall stability of the node area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of an embodiment of a UHPC-based composite beam-column non-penetration type connection node in the present invention; Figure 2 yes Figure 1 Schematic diagram of the coordination between the precast beam and the connecting ring reinforcement on the left side of the middle; Figure 3 yes Figure 1 Schematic diagram of the structure of the steel pipe; Figure 4 yes Figure 1 The structural diagram of the steel section of the precast beam on the left side of the middle; Figure 5 yes Figure 4 Stereoscopic image of Figure 6 yes Figure 1 Schematic diagram of the concrete after transparency treatment; 1. Steel tube composite column; 2. Steel section; 3. Upper longitudinal reinforcement; 4. First bolt; 5. Stirrups of beam reinforcement skeleton; 6. Steel tube; 7. UHPC center concrete; 8. Connection ring; 9. Upper flange plate; 10. Vertical connection steel plate; 11. Connection ring reinforcement; 12. Outer convex 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 skeleton; 19. Precast exposed steel skeleton section; 20. Precast exposed steel pipe section; 21. Column reinforcement skeleton; 22. Precast column concrete; 23. Precast beam concrete; 24. U-shaped hollow section; 25. Inverted T-shaped section; 26. Third bolt; 27. Web of the steel section of the left precast beam; 28. Lower flange plate; 29. ​​Connection hole. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0017] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0018] The embodiment of a UHPC-based composite beam and column non-penetration type connection node of the present invention is as follows: Figures 1 to 6 As shown: The steel tube composite column 1 includes a left precast beam 16 and a right precast beam 17 arranged on the left and right sides of the steel tube composite column. The steel tube composite column 1 includes a vertically arranged steel tube 6, a column reinforcement skeleton 21 arranged on the outer periphery of the steel tube, and a precast column concrete 22. The precast column concrete 22 is cast and fixed with the steel tube 6 and the column reinforcement skeleton 21 to form an integral structure. The left precast beam and the right precast beam both include a beam reinforcement skeleton and a precast beam concrete 23 cast and fixed with the beam reinforcement skeleton to form an integral structure. The steel tube composite column 1 also includes a left support bracket 14 and a right support bracket integrally formed with the precast column concrete 22.

[0019] The column reinforcement skeleton and the beam reinforcement skeleton are both existing technologies, which include longitudinal bars and stirrups tied and fixed with the longitudinal bars. The longitudinal bars of the column reinforcement skeleton are vertically arranged column longitudinal bars, and the longitudinal bars of the beam reinforcement skeleton are transversely arranged transverse longitudinal bars. The transverse and longitudinal bars include upper longitudinal bars 3 and lower longitudinal bars. Item 5 in the figure represents the stirrups of the beam reinforcement skeleton.

[0020] The column reinforcement skeleton includes a prefabricated exposed reinforcement skeleton section 19 located between the left prefabricated beam and the right prefabricated beam, and the steel pipe includes a prefabricated exposed steel pipe section 20 passing through the center of the prefabricated exposed reinforcement skeleton section. The prefabricated exposed steel pipe section 20 is provided with two connecting rings 8 spaced apart upper and lower, and the two connecting rings are respectively an upper connecting ring and a lower connecting ring.

[0021] The lower longitudinal reinforcement of the beam reinforcement skeleton of the left precast beam 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 right precast beam has a second exposed section of the lower longitudinal reinforcement extending to the left and welded to the lower connecting ring. The beam reinforcement skeletons of the left precast beam and the right precast beam include exposed upper longitudinal reinforcement 3, and the upper ends of the stirrups 5 of the beam reinforcement skeleton are exposed ends of the stirrups connected to the upper longitudinal reinforcement.

[0022] The left precast beam and the right precast beam also include a steel section 2 which is cast and fixed with the corresponding precast beam concrete to form an integral structure. The right end of the steel section includes an upper flange plate 9, a lower flange plate 28 and a web connected between the upper flange plate and the lower flange plate. 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 concrete of the precast beam, and the upper flange plate 9 is located on the upper side of the concrete of the precast beam. A vertical connecting steel plate 10 is welded and fixed on the upper side of the upper flange plate 9. A plurality of connecting holes 29 arranged at intervals along the left and right directions are opened on the vertical connecting steel plate 10. The connecting node also includes a connecting ring rib 11 corresponding to the connecting hole. The connecting ring rib is made of high-strength steel bars. In this embodiment, the connecting ring rib is a square structure. The left end of the connecting ring rib 11 is inserted into the corresponding connecting hole 29 on the left precast beam, and the right end of the connecting ring rib is inserted into the corresponding connecting hole 29 on the right precast beam. The connecting ring rib 11 is tied and fixed to the upper end of the beam reinforcement skeleton of the left precast beam and the right precast beam.

[0023] In this embodiment, the connecting ring reinforcement is a square ring reinforcement composed of connecting longitudinal reinforcement and connecting transverse reinforcement, and the connecting transverse reinforcement is inserted into the corresponding connecting hole. The connecting ring reinforcements are arranged in sequence from the inside to the outside.

[0024] The right end of the web of the steel section of the left precast beam protrudes to the right from the precast beam concrete of the left precast beam, and a first bolt 4 with an axis extending in the left-right direction is fixed to the outer 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 beam concrete of the right precast beam, and a second bolt with an axis extending in the left-right direction is fixed to the outer 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 outer protruding end of the web and the corresponding first bolt are also in an exposed state. The exposed in this embodiment refers to being exposed before the post-cast UHPC concrete is poured. After the post-cast UHPC concrete is poured, the exposed position is no longer exposed.

[0025] The left supporting corbel 14 is located just below the outer convex end of the web of the steel section of the left precast beam, and the right supporting corbel is located just below the outer convex end of the web of the steel section of the right precast beam.

[0026] The precast beam concrete of the left precast beam and the right precast beam both include a solid end 13 adjacent to the steel tube composite column and a U-shaped hollow section 24 away from the steel tube composite column, the upper flange plate of the steel section is located on the upper side of the solid end, the end of the steel section away from the steel tube composite column is an inverted T-shaped section, the bottom flange plate of the inverted T-shaped section and the precast beam concrete 23 are cast into an integral structure, the upper end of the web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section, the upper end of the middle web of the inverted T-shaped section is fixed with a plurality of third bolts 26 spaced in the left and right directions, the upper end of the middle web of the inverted T-shaped section and the third bolts are cast and fixed with the post-cast UHPC concrete into an integral structure. That is to say, in this embodiment, the end of the steel section close to the steel tube composite column is an H-shaped structure, the end of the steel section away from the steel tube composite column is an inverted T-shaped structure, and the steel section is an integrally formed structure. When it is manufactured, the upper flange plate at the left end of the H-shaped steel can be cut off to form the steel section.

[0027] At the construction site, the first exposed section of the lower longitudinal reinforcement of the left precast beam and the second exposed section of the 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.

[0028] The left end of each connecting ring reinforcement is installed in the corresponding connecting hole on the left precast beam, and the right end of each connecting ring reinforcement is installed in the corresponding connecting hole on the right precast beam, and the connecting ring reinforcement is tied and fixed to the exposed beam reinforcement skeleton of the left precast beam and the right precast beam.

[0029] Then, cast post-cast UHPC concrete 15 and cast UHPC center concrete 7 in the inner hole of the steel tube of the steel tube composite column, cast post-cast UHPC concrete and the exposed ends of 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 lower longitudinal bars, and the exposed ends of the second lower longitudinal bars into an integral structure, cast post-cast UHPC concrete and the convex ends of the webs of the steel of the left precast beam, the first stud, the convex ends of the webs of the steel of the right precast beam, and the second stud into an integral structure, and cast post-cast UHPC concrete and the upper ends of the middle webs of the inverted T-shaped sections and the third stud into an integral structure. The left support bracket and the right support bracket play an auxiliary supporting role for the post-cast UHPC concrete.

[0030] In the present invention, the steel sections of the left precast beam and the right precast beam do not penetrate the steel pipes of the steel pipe composite column, and thus can be referred to as a non-penetration type connection node.

[0031] The left and right precast beams use inverted T-shaped steel in the positive moment zone, and the third bolts are welded on both sides of the top of the inverted T-shaped section to ensure the cooperative working ability between the steel and the post-cast UHPC concrete. H-shaped steel is used in the negative moment zone, and the upper flange plate of the steel is welded with a vertical connecting steel plate. The connecting ring bars made of high-strength steel bars pass through the vertical connecting steel plate to form a steel ring connected to the composite beam of the symmetric surface, so that the flange energy of the steel can be transmitted to the beam or column of the symmetric surface. For multi-story buildings not exceeding 40m, the vertical load plays a leading role. Under the action of seismic load, the negative bending moment at the upper ends of the column is greater than the positive bending moment. Only the vertical connecting steel plate and connecting ring bars can be set on the upper flange plate of the steel. For high-rise buildings over 40m, the seismic load plays a leading role. Under the action of seismic load, the negative bending moment at both ends of the column may be less than the positive bending moment. At this time, in order to ensure the safety of the structure and the reliable transmission of internal forces, vertical connecting steel plates and connecting ring bars are also required at the same position of the lower flange plate of the steel.

[0032] The protruding ends of the webs of the steel sections of the left precast beam and the right precast beam extend outward to the core area of ​​the beam-column node. The first bolt and the second bolt are welded on both sides of the web of the steel sections to effectively transmit the shear force at the beam ends. At the same time, the left precast beam and the right precast beam adopt U-shaped hollow sections with hollow cross-sections. Solid ends of a certain length are set at the ends of the left precast beam and the right precast beam to effectively improve the stiffness and shear bearing capacity of the core area of ​​the node, thereby realizing "strong nodes and weak components".

[0033] Since UHPC has ultra-high compressive strength, good toughness and ductility, after the steel UHPC composite beam and the steel tube UHPC composite column are overlapped and assembled, UHPC is poured in the overlapping area to form a whole, which improves the ability of the structure to deform in coordination and shows high bearing capacity and ductility.

[0034] Compared with the prior art, the present invention has the following significant effects: 1. The prefabricated building connection node of the present invention is easy to install, requires less on-site welding work, and does not require bolt connection throughout the entire process, which helps to reduce construction accuracy requirements and difficulty and improve installation and construction efficiency.

[0035] 2. The prefabrication degree of the prefabricated building connection node components of the present invention is high. The steel pipes, connection rings and steel UHPC (steel UHPC includes column steel skeleton and prefabricated column concrete) in the steel pipe composite column can be prefabricated in the factory, and the UHPC center concrete in the steel pipe is poured on site. The steel UHPC, steel sections and bolts in the left and right prefabricated beams can be prefabricated in the factory, transported to the construction site for reliable connection, and the casting of nodes and beam superposition layers of UHPC not only simplifies the on-site construction process, but also effectively reduces environmental pollution.

[0036] 3. The prefabricated building connection nodes of the present invention are cast in one piece with UHPC. Due to the excellent mechanical properties of UHPC, compared with ordinary concrete, it has stronger compressive resistance, tensile resistance, and bonding ability, which helps to increase the shear resistance and stiffness of the nodes.

[0037] 4. In the connection nodes of the prefabricated buildings 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 transmitted by welding bolts to the web of the steel section, and the flange bending moment is transmitted by welding porous steel plates and perforated high-strength steel bars to the flange plate of the steel section, thereby avoiding the collision between the steel bars and the steel section and the steel pipe. The vertical steel bars in the column can pass through from top to bottom to avoid perforation of the steel pipe, effectively avoiding the occurrence of buckling of the steel pipe column, and effectively improving the overall stability of the node area.

[0038] The implementation of the construction method of the connection node in the present invention is as follows: Figures 1 to 6 As shown: A construction method for the above-mentioned connection node, The construction method comprises the following steps: in a first step, a steel pipe composite column, a left precast beam and a right precast beam are manufactured in a factory; the steel pipe composite column comprises a vertically arranged steel pipe, a column reinforcement skeleton arranged on the outer periphery of the steel pipe and a precast column concrete which is cast and fixed with the steel pipe and the column reinforcement skeleton to form an integral structure; the left precast beam and the right precast beam both comprise a beam reinforcement skeleton and a precast beam concrete which is cast and fixed with the beam reinforcement skeleton to form an integral structure; the column reinforcement skeleton comprises a precast exposed reinforcement skeleton section located between the left precast beam and the right precast beam; the steel pipe comprises a precast exposed steel pipe section which is penetrated through the center of the precast exposed reinforcement skeleton 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 skeleton of the left precast beam has a first exposed section of the lower longitudinal reinforcement extending to the right, and the lower longitudinal reinforcement of the right precast beam has a second exposed section of the lower longitudinal reinforcement extending to the left. The beam reinforcement skeletons of the left precast beam and the right precast beam include exposed upper longitudinal reinforcements, and the upper ends of the stirrups of the beam reinforcement skeleton are exposed ends of the stirrups connected to the upper longitudinal reinforcements. The left precast beam and the right precast beam 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 connected between the upper flange plate and the lower flange plate, the lower flange plate is located on the inner side of the precast beam concrete, the upper flange plate is located on the upper side of the precast beam concrete, a vertical connecting steel plate is welded and fixed on the upper side of the upper flange plate, and a plurality of connecting holes arranged at intervals along the left and right directions are opened on the vertical connecting steel plate. The right end of the web of the steel section of the left precast beam protrudes to the right from the precast beam concrete of the left precast beam, and a first bolt with an axis extending in the left-right direction is fixed to the outer 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 beam concrete of the right precast beam, and a second bolt with an axis extending in the left-right direction is fixed to the outer convex end of the web of the steel section of the right precast beam. The precast beam concrete of the left precast beam and the right precast beam both include a solid end adjacent to the steel tube composite column and a U-shaped hollow section away from the steel tube composite column, the upper flange plate 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 plate of the inverted T-shaped section and the precast beam concrete are cast into an integral structure, the upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section, and a plurality of third bolts spaced apart in the left-right direction are fixed to the upper end of the middle web of the inverted T-shaped section; The second step is that at the construction site, the first exposed section of the lower longitudinal reinforcement of the left precast beam and the second exposed section of the 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. The left end of each connecting ring reinforcement is inserted into the corresponding connecting hole on the left precast beam, and the right end of each connecting ring reinforcement is inserted into the corresponding connecting hole on the right precast beam, and the connecting ring reinforcement is tied and fixed to the exposed beam reinforcement skeleton of the left precast beam and the right precast beam; The third step is to cast the post-cast UHPC concrete. The post-cast UHPC concrete and 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 lower longitudinal bars, and the exposed ends of the second lower longitudinal bars are cast and fixed into an integral structure. The post-cast UHPC concrete and the convex end of the web of the steel section of the left precast beam, the first stud, the convex end of the web of the steel section of the right precast beam, and the second stud are cast and fixed into an integral structure. The post-cast UHPC concrete and the upper end of the middle web of the inverted T-shaped section and the third stud are cast and fixed into an integral structure. Pour UHPC central concrete into the inner hole of the steel tube of the steel tube composite column.

[0039] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; 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 be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0040] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0041] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel-free penetration connection node based on UHPC composite beams and columns, comprising a steel tube composite column and a left precast beam and a right precast beam arranged on the left and right sides of the steel tube composite column, wherein the steel tube composite column comprises a vertically arranged steel tube, a column reinforcement skeleton arranged on the periphery of the steel tube, and a precast column concrete cast and fixed with the steel tube and the column reinforcement skeleton to form an integral structure, and the left precast beam and the right precast beam both comprise a beam reinforcement skeleton and a precast beam concrete cast and fixed with the beam reinforcement skeleton to form an integral structure, characterized in that: The column reinforcement skeleton includes a prefabricated exposed reinforcement skeleton section located between the left prefabricated beam and the right prefabricated beam, the steel pipe includes a prefabricated exposed steel pipe section passing through the center of the prefabricated exposed reinforcement skeleton section, the prefabricated exposed steel pipe section is provided with an upper connecting ring and a lower connecting ring, the lower longitudinal reinforcement of the beam reinforcement skeleton of the left prefabricated beam has a first lower longitudinal reinforcement exposed section extending rightward and connected to the lower connecting ring by welding, the lower longitudinal reinforcement of the right prefabricated beam has a second lower longitudinal reinforcement exposed section extending leftward and connected to the lower connecting ring by welding, the beam reinforcement skeletons of the left prefabricated beam and the right prefabricated beam include exposed upper longitudinal reinforcement, the upper end of the stirrups of the beam reinforcement skeleton is the exposed end of the stirrups connected to the upper longitudinal reinforcement, the left prefabricated beam and the right prefabricated beam also include steel sections that are cast and fixed to the corresponding prefabricated beam into an integral structure with concrete, one end of the steel section includes an upper flange plate, a lower wing The flange plate and the middle web plate connected between the upper flange plate and the lower flange plate, the lower flange plate is located on the inner side of the precast beam concrete, the upper flange plate is located on the upper side of the precast beam concrete, a vertical connecting steel plate is welded and fixed on the upper side of the upper flange plate, a plurality of connecting holes arranged at intervals along the left and right directions are opened on the vertical connecting steel plate, the connecting node also includes connecting ring bars corresponding to the connecting holes, the left end of the connecting ring bar is inserted into the corresponding connecting hole on the left precast beam, the right end of the connecting ring bar is inserted into the corresponding connecting hole on the right precast beam, the precast exposed steel pipe section is located on the inner side of the connecting ring bar, the exposed ends of the stirrups of the left precast beam and the right precast beam, the upper longitudinal bars of the left precast beam and the right precast beam, the exposed ends of the first lower longitudinal bars, the exposed ends of the second lower longitudinal bars, the precast exposed steel pipe section and the precast exposed steel bar skeleton section are cast and fixed with 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, and the connecting transverse reinforcement is passed through the corresponding connecting holes.

3. The connection node according to claim 1, characterized in that: The connecting ring reinforcements are arranged 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 beam concrete of the left precast beam, and a first bolt with an axis extending in the left-right direction is fixed to the outer 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 beam concrete of the right precast beam, and a second bolt with an axis extending in the left-right direction is fixed to the outer convex end of the web of the steel section of the right precast beam, and the outer convex end of the web of the steel section of the left precast beam, the first bolt, the outer convex end of the web of the steel section of the right precast beam, and the second bolt are cast and fixed with the post-cast UHPC concrete to form an integral structure.

5. The connection node according to claim 4, characterized in that: The steel tube composite column also includes a left supporting corbel and a right supporting corbel integrally formed with the precast column concrete. The left supporting corbel is located directly below the outer convex end of the web of the steel section of the left precast beam, and the right supporting corbel is located directly below the outer 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: The precast beam concrete of the left precast beam and the right precast beam both include a solid end adjacent to the steel tube composite column and a U-shaped hollow section away from the steel tube composite column. The upper flange plate 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 plate of the inverted T-shaped section and the precast beam concrete are cast into an integral structure. The upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section. A plurality of third bolts arranged at intervals along the left and right directions are fixed to the upper end of the middle web of the inverted T-shaped section. The upper end of the middle web of the inverted T-shaped section and the third bolts are cast and fixed with the post-cast UHPC concrete into an integral structure.

7. A construction method for a connection node according to any one of claims 1 to 6, characterized in that: The construction method comprises the following steps: in a first step, a steel pipe composite column, a left precast beam and a right precast beam are manufactured in a factory; the steel pipe composite column comprises a vertically arranged steel pipe, a column reinforcement skeleton arranged on the outer periphery of the steel pipe and a precast column concrete which is cast and fixed with the steel pipe and the column reinforcement skeleton to form an integral structure; the left precast beam and the right precast beam both comprise a beam reinforcement skeleton and a precast beam concrete which is cast and fixed with the beam reinforcement skeleton to form an integral structure; the column reinforcement skeleton comprises a precast exposed reinforcement skeleton section located between the left precast beam and the right precast beam; the steel pipe comprises a precast exposed steel pipe section which is penetrated through the center of the precast exposed reinforcement skeleton 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 skeleton of the left precast beam has a first exposed section of the lower longitudinal reinforcement extending to the right, and the lower longitudinal reinforcement of the right precast beam has a second exposed section of the lower longitudinal reinforcement extending to the left. The beam reinforcement skeletons of the left precast beam and the right precast beam include exposed upper longitudinal reinforcements, and the upper ends of the stirrups of the beam reinforcement skeleton are exposed ends of the stirrups connected to the upper longitudinal reinforcements. The left precast beam and the right precast beam 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 connected between the upper flange plate and the lower flange plate, the lower flange plate is located on the inner side of the precast beam concrete, the upper flange plate is located on the upper side of the precast beam concrete, a vertical connecting steel plate is welded and fixed on the upper side of the upper flange plate, and a plurality of connecting holes arranged at intervals along the left and right directions are opened on the vertical connecting steel plate. The right end of the web of the steel section of the left precast beam protrudes to the right from the precast beam concrete of the left precast beam, and a first bolt with an axis extending in the left-right direction is fixed to the outer 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 beam concrete of the right precast beam, and a second bolt with an axis extending in the left-right direction is fixed to the outer convex end of the web of the steel section of the right precast beam. The precast beam concrete of the left precast beam and the right precast beam both include a solid end adjacent to the steel tube composite column and a U-shaped hollow section away from the steel tube composite column, the upper flange plate 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 plate of the inverted T-shaped section and the precast beam concrete are cast into an integral structure, the upper end of the middle web of the inverted T-shaped section extends into the inner hole of the U-shaped hollow section, and a plurality of third bolts spaced apart in the left-right direction are fixed to the upper end of the middle web of the inverted T-shaped section; The second step is that at the construction site, the first exposed section of the lower longitudinal reinforcement of the left precast beam and the second exposed section of the lower longitudinal reinforcement of the right precast beam are welded and connected to the lower connecting ring; the right end of the upper longitudinal reinforcement of the left precast beam is welded and connected to the upper connecting ring, and the left end of the upper longitudinal reinforcement of the right precast beam is welded and connected to the upper connecting ring, and the left end of each connecting ring reinforcement is inserted into the corresponding connecting hole on the left precast beam, and the right end of each connecting ring reinforcement is inserted into the corresponding connecting hole on the right precast beam, and the connecting ring reinforcement is tied and fixed to the exposed beam reinforcement skeleton of the left precast beam and the right precast beam; The third step is to cast the post-cast UHPC concrete. The post-cast UHPC concrete and 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 lower longitudinal bars, and the exposed ends of the second lower longitudinal bars are cast and fixed into an integral structure. The post-cast UHPC concrete and the convex end of the web of the steel section of the left precast beam, the first stud, the convex end of the web of the steel section of the right precast beam, and the second stud are cast and fixed into an integral structure. The post-cast UHPC concrete and the upper end of the middle web of the inverted T-shaped section and the third stud are cast and fixed into an integral structure. Pour UHPC central concrete into the inner hole of the steel tube of the steel tube composite column.

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