Connecting joint of section steel UHPC (Ultra High Performance Concrete) composite beam and steel tube UHPC composite column

Abstract

The utility model relates to a connecting node of a section steel UHPC (Ultra High Performance Concrete) combination beam and a steel tube UHPC combination column, a left side precast beam and a right side precast beam of the connecting node further comprise section steel which is fixed into an integral structure with the corresponding precast beams in a concrete pouring manner, and one end of the section 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; beam reinforcement frameworks of the left precast beam and the right precast beam comprise exposed upper longitudinal bars, the upper ends of stirrups of the beam reinforcement frameworks are stirrup exposed ends connected with the upper longitudinal bars, and the stirrup exposed ends of the left precast beam and the right precast beam are connected with the upper longitudinal bars of the left precast beam and the right precast beam. Post-poured UHPC concrete is poured and fixed to the peripheries of the prefabricated exposed steel pipe sections and the prefabricated exposed steel reinforcement framework sections. The utility model provides the UHPC-based composite beam and column penetration-free type connecting node and the construction method, which can improve the connecting strength between the beam and the column.

Description

TECHNICAL FIELD

[0001] The utility model relates to precast beam, column concrete building construction technical field especially relates to a kind of connecting joint of profile steel UHPC composite beam and steel pipe UHPC composite column. BACKGROUND

[0002] With the development of modern construction and industrialization, more and more urban buildings, common high-rise buildings and heavy load large span buildings, commonly used profile steel concrete composite beam and steel pipe concrete composite column are used as a combined structure for force, the structure has the advantages of high bearing capacity, good seismic performance, good ductility, can greatly reduce the section size, improve building use space, with good economic benefit and practical value, widely used in large public building projects and super high-rise projects.

[0003] Profile steel UHPC composite beam and steel pipe UHPC composite column are a new type of structural member based on the excellent material performance of UHPC and combined with the construction method of fabricated concrete. The existing connecting joint based on UHPC composite beam and column, such as Chinese patent CN118498623A, discloses "a steel UHPC-core steel pipe concrete composite column and its design and construction method", which discloses a connecting joint based on UHPC composite beam and column, which includes a prefabricated column and a prefabricated beam, the prefabricated column includes core concrete, steel pipe and steel UHPC arranged from inside to outside, the steel UHPC includes column steel cage and column UHPC integrally formed with the column steel cage, the prefabricated beam includes beam steel cage and beam UHPC integrally formed with the beam steel cage.

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

[0005] This existing connecting joint only relies on the welding of longitudinal reinforcement and outer ring steel plate to realize the structural connection between column and beam, which not only cannot guarantee the connection strength, but also requires a large amount of reaming operation for on-site construction welding, has high requirements for construction quality, and greatly increases the construction difficulty. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a connecting joint of profile steel UHPC composite beam and steel pipe UHPC composite column which can improve the connection strength between beam and column.

[0007] To solve the above technical problems, the technical scheme of a connecting joint of profile steel UHPC composite beam and steel pipe UHPC composite column in the utility model is as follows:

[0008] A connection joint of a profile steel UHPC composite beam and a steel pipe UHPC composite column, comprising a steel pipe composite column and left and right precast beams arranged on the left and right sides of the steel pipe composite column, the steel pipe composite column comprising a vertically arranged steel pipe, a column steel reinforcement framework arranged on the periphery of the steel pipe, and precast column concrete integrally formed with the steel pipe and the column steel reinforcement framework, the left and right precast beams each comprising a beam steel reinforcement framework and precast beam concrete integrally formed with the beam steel reinforcement framework, the column steel reinforcement framework comprising a precast bare steel reinforcement framework section between the left and right precast beams, the steel pipe comprising a precast bare steel pipe section arranged in the center of the precast bare steel reinforcement framework section, the precast bare steel pipe section being provided with an upper connecting ring and a lower connecting ring, the lower longitudinal reinforcement of the beam steel reinforcement framework of the left precast beam having a first lower longitudinal reinforcement exposed section extending outward to the right and welded to the lower connecting ring, the lower longitudinal reinforcement of the right precast beam having a second lower longitudinal reinforcement exposed section extending outward to the left and welded to the lower connecting ring, the beam steel reinforcement framework of the left and right precast beams comprising exposed upper longitudinal reinforcement, the upper end of the stirrup of the beam steel reinforcement framework being a stirrup exposed end connected to the upper longitudinal reinforcement, the stirrup exposed ends of the left and right precast beams, the upper longitudinal reinforcement of the left and right precast beams, the first lower longitudinal reinforcement exposed section, the second lower longitudinal reinforcement exposed section, the precast bare steel pipe section, and the precast bare steel reinforcement framework section being integrally formed with post-poured UHPC concrete.

[0009] Further, the right end of the web of the profile steel of the left precast beam protrudes to the right of the precast beam concrete of the left precast beam, and the protruding end of the web of the profile steel of the left precast beam is fixed with a first stud extending along the left-right direction; the left end of the web of the profile steel of the right precast beam protrudes to the left of the precast beam concrete of the right precast beam, and the protruding end of the web of the profile steel of the right precast beam is fixed with a second stud extending along the left-right direction, the protruding end of the web of the profile steel of the left precast beam, the first stud, the protruding end of the web of the profile steel of the right precast beam, and the second stud being integrally formed with the post-poured UHPC concrete.

[0010] Further, the steel pipe composite column further comprises a left support bracket and a right support bracket integrally formed with the precast column concrete, the left support bracket being located directly below the protruding end of the web of the profile steel of the left precast beam, and the right support bracket being located directly below the protruding end of the web of the profile steel of the right precast beam.

[0011] Further, the precast beam concrete of the left precast beam and the right precast beam each comprises 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 plate of the profile steel is located on the upper side of the solid end, the profile steel further comprises a reverse T-shaped section, the bottom flange plate of the reverse T-shaped section is integrally formed with the precast beam concrete, the upper end of the middle web plate of the reverse T-shaped section extends into the inner hole of the U-shaped hollow section, a plurality of third studs are fixed to the upper end of the middle web plate of the reverse T-shaped section and are arranged at intervals in the left-right direction, and the upper end of the middle web plate of the reverse T-shaped section and the third studs are integrally formed with the post-cast UHPC concrete.

[0012] The utility model discloses beneficial effects that: in the utility model, because the better compression resistance of UHPC, tensile property, cancel the connection of profile steel and steel pipe, the exposed end of stirrup of post-cast UHPC concrete and left precast beam, right precast beam, the upper side longitudinal reinforcement of left precast beam, right precast beam, first lower side longitudinal reinforcement exposed end, second lower side longitudinal reinforcement exposed end, integrally cast together, thereby guarantee the connecting strength between composite beam, composite column, the column longitudinal reinforcement of column steel reinforcement cage of steel pipe composite column can be up and down through, avoid steel pipe perforation, effectively avoid the occurrence of steel pipe column buckling, can effectively improve the overall stability of node area. BRIEF DESCRIPTION OF DRAWINGS

[0013] The above and other objects, features and advantages of the disclosed example embodiments will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the disclosure are shown by way of example, and wherein like or corresponding elements show like or corresponding parts, by reference numbers, in which:

[0014] Figure 1 is a structure schematic view of the connecting joint of profile steel UHPC composite beam and steel pipe UHPC composite column in the utility model;

[0015] Figure 2 is Figure 1 the structure schematic view of the profile steel of left precast beam in

[0016] Figure 3 is Figure 2 the perspective view of

[0017] Figure 4 is Figure 1 the state schematic view of left precast beam in the utility model after removing profile steel and precast beam concrete;

[0018] 1, steel pipe composite column; 2, profile steel; 3, upper longitudinal reinforcement; 4, first stud; 5, stirrup of beam reinforcement cage; 6, steel pipe; 7, second stud; 8-1, upper connecting ring; 8-2, lower connecting ring; 9, upper flange plate; 12, left side precast beam profile steel web outer convex end; 13, solid end; 14, left side support bracket; 15, post-cast UHPC concrete; 16, left side precast beam; 17, right side precast beam; 18, column reinforcement cage longitudinal reinforcement; 19, precast bare reinforcement cage section; 20, precast bare 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; 27, left side precast beam profile steel web; 28, lower flange plate. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used in the specification have the same meaning as commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0021] An embodiment of a profile steel UHPC composite beam and steel pipe UHPC composite column connecting node in the present application is shown in Figures 1-4

[0022] It comprises a steel pipe composite column 1 and left and right side precast beams 16 and 17 arranged on the left and right sides of the steel pipe composite column, the steel pipe composite column is a UHPC composite column, the left and right side precast beams are UHPC composite beams, the steel pipe composite column 1 comprises vertically arranged steel pipes 6, a column reinforcement cage 21 arranged on the periphery of the steel pipes and precast column concrete 22, the precast column concrete 22 is integrally formed with the steel pipes 6 and the column reinforcement cage 21. The left and right side precast beams each comprise a beam reinforcement cage and precast beam concrete 23 integrally formed with the beam reinforcement cage. The steel pipe composite column 1 further comprises a left side support bracket 14 and a right side support bracket integrally formed with the precast column concrete 22.

[0023] ​The column steel reinforcement cage and the beam steel reinforcement cage are prior arts, which include longitudinal reinforcement and stirrup fixed with the longitudinal reinforcement, wherein the longitudinal reinforcement of the column steel reinforcement cage is vertical column longitudinal reinforcement, and the longitudinal reinforcement of the beam steel reinforcement cage is horizontal longitudinal reinforcement, which includes upper side longitudinal reinforcement 3 and lower side longitudinal reinforcement, and the stirrup of the beam steel reinforcement cage is indicated by item 5 in the figure.

[0024] The column steel reinforcement cage includes a precast bare steel reinforcement cage segment 19 between the left precast beam and the right precast beam, and the steel pipe includes a precast bare steel pipe segment 20 arranged in the center of the precast bare steel reinforcement cage segment, and the precast bare steel pipe segment 20 is provided with two connecting rings arranged in an upper and lower interval, which are an upper connecting ring 8-1 and a lower connecting ring 8-2 respectively.

[0025] The lower side longitudinal reinforcement of the beam steel reinforcement cage of the left precast beam has a first lower side longitudinal reinforcement exposed segment outwardly extending to the right and welded with the lower connecting ring, and the lower side longitudinal reinforcement of the right precast beam has a second lower side longitudinal reinforcement exposed segment outwardly extending to the left and welded with the lower connecting ring, and the beam steel reinforcement cage of the left precast beam and the right precast beam includes the exposed upper side longitudinal reinforcement 3, and the upper end of the stirrup 5 of the beam steel reinforcement cage is a stirrup exposed end connected with the upper side longitudinal reinforcement.

[0026] The left precast beam and the right precast beam further include a profile steel 2 fixed with the corresponding precast beam concrete to form an integral structure, and the right end of the profile steel includes an upper flange plate 9, a lower flange plate 28 and a web plate connected between the upper flange plate and the lower flange plate, and the web plate of the profile steel of the left precast beam is indicated by item 27 in the figure, the lower flange plate is located on the inner side of the precast beam concrete, and the upper flange plate 9 is located on the upper side of the precast beam concrete.

[0027] The right end of the web plate of the profile steel of the left precast beam protrudes to the right precast beam concrete of the left precast beam, and the outer protruding end 12 of the web plate of the profile steel of the left precast beam is fixed with a first dowel 4 with an axis extending in the left-right direction; the left end of the web plate of the profile steel of the right precast beam protrudes to the left precast beam concrete of the right precast beam, and the outer protruding end of the web plate of the profile steel of the right precast beam is fixed with a second dowel with an axis extending in the left-right direction. That is, before the post-cast UHPC concrete is poured, the outer protruding end of the web plate and the corresponding first dowel are also in a bare state, and the bare in this embodiment refers to the bare before the post-cast UHPC concrete is poured, and after the post-cast UHPC concrete is poured, the bare position is no longer bare.

[0028] The left side support bracket 14 is located on the lower side of the outer protruding end of the web plate of the profile steel of the left precast beam, and the right side support bracket is located on the lower side of the outer protruding end of the web plate of the profile steel of the right precast beam.

[0029] The precast beam concrete of the left precast beam and the right precast beam each comprises a solid end 13 arranged adjacent to the steel pipe composite column and a U-shaped hollow section 24 away from the steel pipe composite column, the upper flange plate of the profile steel is located on the upper side of the solid end, one end of the profile steel away from the steel pipe composite column is a reverse T-shaped section, the bottom flange plate of the reverse T-shaped section is integrally formed with the precast beam concrete 23, the upper end of the web of the reverse T-shaped section extends into the inner hole of the U-shaped hollow section, a plurality of third studs 26 are fixed to the upper end of the middle web of the reverse T-shaped section and are arranged at intervals in the left-right direction, and the upper end of the middle web of the reverse T-shaped section and the third studs are integrally formed with the post-cast UHPC concrete. That is, in the embodiment, one end of the profile steel close to the steel pipe composite column is an H-shaped structure, one end of the profile steel away from the steel pipe composite column is a reverse T-shaped structure, and the profile steel is an integrally formed structure, and when the profile steel is manufactured, the upper flange plate of the left end of the H-shaped steel can be cut off to form the profile steel. In other embodiments of the utility model, the profile steel can also be integrally formed in a T-shaped structure.

[0030] On the construction site, the first lower side longitudinal reinforcement exposed section of the left precast beam and the second lower side longitudinal reinforcement exposed section of the right precast beam are welded to the lower side connecting ring; the right end of the upper side longitudinal reinforcement of the left precast beam is welded to the upper layer connecting ring, and the left end of the upper side longitudinal reinforcement of the right precast beam is welded to the upper side connecting ring.

[0031] Then, the post-cast UHPC concrete 15 and the UHPC center concrete 7 in the inner hole of the steel pipe of the steel pipe composite column are poured, the post-cast UHPC concrete is integrally formed with the exposed end of the stirrup of the left precast beam and the right precast beam, the upper side longitudinal reinforcement of the left precast beam and the right precast beam, the first lower side longitudinal reinforcement exposed end and the second lower side longitudinal reinforcement exposed end, the post-cast UHPC concrete is integrally formed with the web exposed end of the profile steel of the left precast beam and the first stud and the web exposed end of the profile steel of the right precast beam and the second stud, and the post-cast UHPC concrete is integrally formed with the upper end of the middle web of the reverse T-shaped section and the third stud. The left support bracket and the right support bracket have an auxiliary supporting effect on the post-cast UHPC concrete.

[0032] In the utility model, the profile steel of the left precast beam and the right precast beam does not penetrate the steel pipe of the steel pipe composite column, and therefore can be called a penetration-free type connecting joint.

[0033] The type steel of the left precast beam and the right precast beam uses inverted T-shaped structure in the positive bending moment area, and third studs are welded on the top of the inverted T-shaped section on both sides to ensure the collaborative working capacity between the type steel and the post-cast UHPC concrete.

[0034] Due to the super-high compressive strength, good toughness and ductility of the UHPC, the type steel UHPC composite beam and the steel pipe UHPC composite column are assembled in lap joint, UHPC is cast in the superimposed area to form an integral whole, the structural collaborative deformation capacity is improved, and high bearing capacity and ductility are exhibited.

[0035] Compared with the prior art, the utility model has the following remarkable effects:

[0036] 1、The assembly type building connecting joint of the utility model is convenient to install, has less on-site welding operation amount, is free of bolt connection in the whole process, helps to reduce construction precision requirement and difficulty, and improves installation and construction efficiency.

[0037] 2、The assembly type building connecting joint component of the utility model has high prefabrication degree, the steel pipe in the steel pipe composite column, the connecting ring and the steel bar UHPC (including column steel reinforcement framework and precast column concrete) outside the steel pipe can be prefabricated in a factory, and the UHPC central concrete in the steel pipe is cast on site. The steel bar UHPC, the type steel and the stud in the left precast beam and the right precast beam can be prefabricated in a factory, transported to a construction site to be reliably connected, and the joint and beam superimposed layer UHPC are cast, which not only simplifies the on-site construction process, but also effectively reduces environmental pollution.

[0038] 3、The assembly type building connecting joint of the utility model is integrally cast by UHPC.

[0039] 4、In the assembly type building connecting joint of the utility model, due to the good compressive resistance and tensile resistance of UHPC, the connection between the type steel and the steel pipe is cancelled, and the stud is welded on the type steel web to transfer the web shear force.

[0040] Compared with the traditional concrete connection joint, a large amount of concrete pouring and maintenance work needs to be carried out on site, the site wet work of the prefabricated assembly type steel UHPC composite beam and steel pipe UHPC composite column connection joint is greatly reduced, the influence of construction on the environment is reduced, and the water and electricity demand of the construction site is also reduced, which meets the requirements of green construction.

[0041] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or it can be internal communication of two elements or interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, the above terms can be understood by those skilled in the art according to the specific meaning of the terms in the present application.

[0042] According to the above description of the present specification, those skilled in the art can also understand that the 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" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which is only for the purpose of facilitating the description of the present application and simplifying the description, and is not explicitly or implicitly indicated that the device or element involved must have the said specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0043] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise explicitly specified and limited.

[0044] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A connecting joint of a profile steel UHPC composite beam and a steel pipe UHPC composite column, comprising a steel pipe composite column and a left precast beam and a right precast beam arranged on the left and right sides of the steel pipe composite column, the steel pipe composite column comprising a vertically arranged steel pipe, a column steel reinforcement cage arranged on the periphery of the steel pipe, and precast column concrete integrally cast and fixed with the steel pipe and the column steel reinforcement cage, the left precast beam and the right precast beam each comprising a beam steel reinforcement cage and precast beam concrete integrally cast and fixed with the beam steel reinforcement cage, characterized in that: The column steel framework comprises a precast bare steel framework section between the left precast beam and the right precast beam, the steel pipe comprises a precast bare steel pipe section arranged in the center of the precast bare steel framework section, the precast bare steel pipe section is provided with an upper connecting ring and a lower connecting ring, the lower longitudinal reinforcement of the beam steel framework of the left precast beam has a first lower longitudinal reinforcement exposed section extending outward to the right and welded to the lower connecting ring, the lower longitudinal reinforcement of the right precast beam has a second lower longitudinal reinforcement exposed section extending outward to the left and welded to the lower connecting ring, the beam steel framework of the left precast beam and the right precast beam comprises exposed upper longitudinal reinforcement, the upper end of the stirrup of the beam steel framework is a stirrup exposed end connected to the upper longitudinal reinforcement, the stirrup exposed ends 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 first lower longitudinal reinforcement exposed section, the second lower longitudinal reinforcement exposed section, the precast bare steel pipe section and the precast bare steel framework section are peripherally poured and fixed with post-poured UHPC concrete. ​ 2. The connection node of claim 1, wherein: The right end of the web of the profile steel of the left precast beam protrudes to the right of the precast beam concrete of the left precast beam, and the protruding end of the web of the profile steel of the left precast beam is fixed with a first dowel extending along the left-right direction; the left end of the web of the profile steel of the right precast beam protrudes to the left of the precast beam concrete of the right precast beam, and the protruding end of the web of the profile steel of the right precast beam is fixed with a second dowel extending along the left-right direction, and the protruding end of the web of the profile steel of the left precast beam, the first dowel, the protruding end of the web of the profile steel of the right precast beam and the second dowel are integrally poured and fixed with the post-poured UHPC concrete.

3. The connection node of claim 1, wherein: The steel pipe composite column further comprises a left support bracket and a right support bracket integrally formed with the precast column concrete, the left support bracket is located directly below the protruding end of the web of the profile steel of the left precast beam, and the right support bracket is located directly below the protruding end of the web of the profile steel of the right precast beam.

4. The connection node according to any one of claims 1 to 3, characterized in that: The precast beam concrete of the left precast beam and the right precast beam each comprises 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 plate of the profile steel is located on the upper side of the solid end, the profile steel further comprises an inverted T-shaped section, the bottom flange plate of the inverted T-shaped section is integrally poured 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, the upper end of the middle web of the inverted T-shaped section is fixed with a plurality of third dowels arranged at intervals along the left-right direction, and the upper end of the middle web of the inverted T-shaped section and the third dowels are integrally poured and fixed with the post-poured UHPC concrete.

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