A kind of for steel pipe concrete composite column-prefabricated reinforced concrete beam connecting joint

Abstract

The utility model relates to structural engineering technical field discloses a kind of for steel pipe concrete composite column-prefabricated reinforced concrete beam connecting joint, including steel pipe concrete composite column and prefabricated reinforced concrete beam, steel pipe concrete composite column and prefabricated reinforced concrete beam are connected by connecting piece, connecting piece includes two cantilever short beams, two cantilever short beams first end are fixed on steel pipe concrete composite column, and prefabricated steel plate is fixedly connected between the lower web of cantilever short beam, and the upper web of cantilever short beam is all provided with steel backing plate;Two sides of the second end of two cantilever short beams are all fixedly provided with beam end embedded steel plate, and beam end embedded steel plate is fixedly connected to prefabricated reinforced concrete beam.The utility model satisfies the assembly rate requirement of today's fabricated structure construction, and can effectively overcome the problems, such as traditional cast-in-place steel pipe concrete composite column-prefabricated reinforced concrete beam process complex, construction efficiency is low, bearing capacity is insufficient, energy consumption capacity and seismic performance are limited.

Description

Technical Field

[0001] This utility model relates to the field of structural engineering technology, specifically to a connection node for a steel-concrete composite column-precast reinforced concrete beam. Background Technology

[0002] Since the promulgation and implementation of the "Evaluation Standard for Industrialized Buildings," prefabricated buildings have become a core direction for promoting the development of building industrialization due to their significant advantages of high efficiency and environmental protection. Among them, the steel-concrete composite column-precast reinforced concrete beam structure system has been widely used in high-rise and large-span buildings because it combines the high load-bearing and high ductility advantages of steel-concrete composite columns with the construction convenience of precast reinforced concrete beams.

[0003] However, the core technical bottleneck of this system lies in the design and construction quality of beam-column joints. The performance of the joints directly determines the safety, integrity, seismic energy dissipation capacity, and industrialized construction efficiency of the overall structure. Inadequate joint design can easily lead to weak component connections, potentially causing joint failure, severe structural damage, and collapse under earthquake or other catastrophic loads, posing significant safety hazards.

[0004] The most common prefabricated building structural forms currently include:

[0005] (1) Prefabricated concrete structures: Their joint connections generally rely on sleeve grouting or post-cast concrete strips. These methods require extremely high construction precision, are prone to quality problems such as incomplete grouting, and are difficult to detect and costly to repair.

[0006] (2) Prefabricated steel structure: Although its nodes are easy to construct, it has technical and economic problems such as large steel consumption, high cost, easy fatigue damage of node connections, and strict requirements for fire prevention and rust prevention.

[0007] (3) Modern timber structure: Its node connection reliability is relatively low, and the material itself is susceptible to moisture and corrosion, and has limited fire resistance and load-bearing capacity, which greatly restricts its application in high-rise buildings.

[0008] Compared with the above-mentioned common prefabricated structural forms, the development and promotion of high-performance steel-concrete composite column-precast reinforced concrete beam prefabricated connection node technology is crucial for overcoming the shortcomings of existing nodes and significantly improving the construction efficiency, construction quality and overall industrialization level of prefabricated buildings. This fully meets the urgent technical needs of my country's building industrialization development and has important engineering application value.

[0009] Currently, in common construction methods, steel-concrete composite columns and precast reinforced concrete beams are usually connected by cast-in-place methods. This type of joint often has the following problems:

[0010] (1) Traditional cast-in-place joints require formwork, steel reinforcement and concrete pouring at the column-beam junction. The process is complicated and the curing period is long, which is difficult to match the needs of rapid construction of prefabricated buildings.

[0011] (2) In cast-in-place joints, the cross arrangement of composite column steel pipes and precast beam steel bars can easily cause steel bar congestion, making it difficult to ensure the density of concrete pouring, weakening the shear resistance and energy dissipation capacity of the core area of ​​the joint, and is not conducive to the seismic performance of the overall structure.

[0012] (3) Under earthquakes or long-term loads, once traditional nodes suffer local damage (such as concrete cracking or connector failure), repair requires large-scale structural demolition, which is economical and difficult to operate. Cast-in-place nodes lack energy dissipation mechanisms and it is difficult to restore structural performance through local replacement, which is not conducive to improving the seismic resistance of buildings.

[0013] (4) The cast-in-place process inevitably generates a large amount of construction waste and carbon emissions, which contradicts the low-carbon goal of prefabricated buildings and does not meet the requirements of green environmental protection.

[0014] In summary, the traditional fully wet connection scheme for steel-concrete composite columns and precast reinforced concrete beams is complex, has a long curing period, and limited energy consumption and seismic performance. Furthermore, this type of joint does not meet the requirements of green, low-carbon, and environmentally friendly construction. Therefore, there is an urgent need for a prefabricated connection joint for steel-concrete composite columns and precast reinforced concrete beams. Utility Model Content

[0015] The purpose of this utility model is to provide an assembled connection node for steel-concrete composite columns and precast reinforced concrete beams to overcome the shortcomings of the prior art.

[0016] To achieve the above objectives, the present invention provides the following technical solution:

[0017] A connection node for a steel-concrete composite column-precast reinforced concrete beam includes a steel-concrete composite column and a precast reinforced concrete beam. The steel-concrete composite column and the precast reinforced concrete beam are connected by a connector. The connector includes two cantilever short beams. The first ends of the two cantilever short beams are fixed to the steel-concrete composite column. A precast steel plate is fixedly connected between the lower webs of the cantilever short beams, and a steel pad is provided on the upper web of each cantilever short beam. Pre-embedded steel plates are fixedly provided on both sides of the second ends of the two cantilever short beams, and the pre-embedded steel plates are fixedly connected to the precast reinforced concrete beam.

[0018] Furthermore, the steel-concrete composite column includes a cold-formed high-strength thin-walled circular steel tube, the inside of which is filled with core high-strength concrete, and the outside of which is wrapped with reinforced concrete; several circumferential stiffening ribs are provided between the cold-formed high-strength thin-walled circular steel tube and the reinforced concrete, and two reinforcing rings are fixedly connected to the cold-formed high-strength thin-walled circular steel tube, and the two reinforcing rings are fixedly connected to the first end of two cantilever short beams.

[0019] Furthermore, a steel reinforcement cage is installed inside the precast reinforced concrete beam. The lower part of the steel reinforcement cage is fixed inside the precast reinforced concrete beam, and the upper part of the steel reinforcement cage is cast in place to form a cast-in-place floor slab overlapping part with the precast reinforced concrete beam.

[0020] Furthermore, brass damping plates are welded to both sides of the steel pad.

[0021] Furthermore, the circumferential stiffening ribs reinforce the cold-formed high-strength thin-walled circular steel pipe and reinforced concrete through toothed flanges.

[0022] Furthermore, the strength grade of the cold-formed high-strength thin-walled round steel pipe is not lower than Q420.

[0023] Furthermore, the strength grade of the core high-strength concrete is not lower than C40.

[0024] Furthermore, the strength grade of the reinforced concrete is not lower than C40.

[0025] Furthermore, the cantilever short beam is fixed to the pre-embedded steel plate at the beam end by high-strength bolts.

[0026] Furthermore, the pre-embedded steel plate at the beam end is welded to the reinforcing steel cage and pre-embedded at one end of the precast reinforced concrete beam.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] This invention provides a connection node for a steel-concrete composite column-precast reinforced concrete beam. Two cantilever short beams efficiently transfer the load of the precast reinforced concrete beam to the steel-concrete composite column. Precast steel plates fixed between the lower webs of the cantilever short beams effectively enhance the overall stiffness of the cantilever short beams, making them less prone to deformation under load and ensuring the stability of the connection structure. Steel pads on the upper webs of the cantilever short beams disperse the upper pressure, preventing localized damage due to excessive pressure, extending the service life of the node, improving structural safety, increasing construction efficiency, and ensuring the seismic performance of the node or frame structure. This invention provides a novel prefabricated connection node for a steel-concrete composite column-precast reinforced concrete beam that can be installed quickly, meeting the assembly rate requirements of modern prefabricated structure construction and effectively overcoming the problems of complex procedures, low construction efficiency, insufficient load-bearing capacity, and limited energy consumption and seismic performance of traditional cast-in-place steel-concrete composite column-precast reinforced concrete beam connections.

[0029] The steel-concrete composite column of this invention uses cold-formed high-strength thin-walled circular steel tubes and core high-strength concrete, which can overcome the problem of excessive cross-section caused by insufficient strength of traditional materials. Furthermore, the cold-formed high-strength thin-walled circular steel tubes have a restraining effect on the core high-strength concrete, and the outer reinforced concrete can prevent local buckling of the steel tubes. This fully utilizes the load-bearing capacity of high-strength materials, improves the overall stability of the steel-concrete composite column, and reduces construction costs.

[0030] This utility model adopts a novel node construction scheme, which can effectively improve the construction quality and efficiency of the new hybrid structure of steel tube concrete composite column-precast reinforced concrete beam, enhance structural performance, meet the requirements of green and low-carbon construction, and is applicable to various cross-sectional forms. It has good economic benefits and technical advantages in the application of modern civil buildings, industrial buildings, special buildings and other multi-story important buildings. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a connection node between a steel-concrete composite column and a precast reinforced concrete beam, as described in an embodiment of this utility model.

[0032] Figure 2 This is a schematic diagram of the connection structure between the steel-concrete composite column and the cantilever short beam in an embodiment of this utility model.

[0033] Figure 3 This is a schematic diagram of the connection structure between the precast reinforced concrete beam and the pre-embedded steel plate at the beam end in an embodiment of this utility model.

[0034] Figure 4 This is a schematic diagram of the connection structure between the cantilever short beam and the pre-embedded steel plate at the beam end in an embodiment of this utility model.

[0035] In the diagram, 1. Cold-formed high-strength thin-walled circular steel pipe; 2. Core high-strength concrete; 3. Reinforced concrete; 4. Precast reinforced concrete beam; 5. Cast-in-place floor slab overlap; 6. Reinforcing steel cage; 7. Beam end embedded steel plate; 8. Reinforcing ring; 9. Circumferential stiffening rib; 10. Cantilever short beam; 11. Precast steel plate; 12. Steel pad; 13. Brass damping plate; 14. High-strength bolt. Detailed Implementation

[0036] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0042] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] The accompanying drawings show various structural schematic diagrams according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged and may have been omitted for clarity. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0045] See Figures 1 to 4This utility model provides a connection node for a steel-concrete composite column-precast reinforced concrete beam, comprising a steel-concrete composite column and a precast reinforced concrete beam 4. The steel-concrete composite column and the precast reinforced concrete beam 4 are connected by a connector, which includes two cantilever short beams 10. The first ends of the two cantilever short beams 10 are fixed to the steel-concrete composite column to transfer the load of the precast reinforced concrete beam 4 to the steel-concrete composite column. Precast steel plates 11 are fixedly connected between the lower webs of the cantilever short beams 10 to enhance the overall rigidity of the cantilever short beams 10. Steel pads 12 are provided on the upper webs of the cantilever short beams 10 to distribute the upper pressure borne by the cantilever short beams 10. Beam end embedded steel plates 7 are fixedly provided on both sides of the second ends of the two cantilever short beams 10, and the beam end embedded steel plates 7 are fixedly connected to the precast reinforced concrete beam 4 to achieve a stable connection between the cantilever short beams 10 and the precast reinforced concrete beam 4.

[0046] The steel-concrete composite column includes a cold-formed high-strength thin-walled circular steel tube 1, which serves as the core load-bearing framework, providing excellent shear and bending resistance. The cold-formed high-strength thin-walled circular steel tube 1 is filled with core high-strength concrete 2, which works in conjunction with the cold-formed high-strength thin-walled circular steel tube 1 to improve the compressive bearing capacity of the steel-concrete composite column. The cold-formed high-strength thin-walled circular steel tube 1 is externally encased in reinforced concrete 3, further enhancing the column's overall strength. The steel pipe exhibits high rigidity and durability. Several circumferential stiffening ribs 9 are provided between the cold-formed high-strength thin-walled round steel pipe 1 and the reinforced concrete 3 to fix the cold-formed high-strength thin-walled round steel pipe 1 and the reinforced concrete 3 and prevent relative slippage between them. Two reinforcing rings 8 are fixedly connected to the cold-formed high-strength thin-walled round steel pipe 1. The two reinforcing rings 8 are fixedly connected to the first end of the two cantilever short beams 10 to enhance the strength of the connection between the cantilever short beams 10 and the steel pipe. The cantilever short beams 10 are I-shaped cantilever short beams 10.

[0047] In a preferred embodiment of this utility model, the circumferential stiffening rib 9 reinforces the cold-formed high-strength thin-walled round steel pipe 1 and the reinforced concrete 3 through toothed flanges, thereby enhancing the mechanical interlocking effect between the cold-formed high-strength thin-walled round steel pipe 1 and the reinforced concrete 3 and improving the shear resistance of the structure.

[0048] In a preferred embodiment of this utility model, brass damping plates 13 are welded to both sides of the steel pad 12. The plastic deformation of the brass damping plates 13 is used to dissipate seismic energy and improve the seismic performance of the node.

[0049] In a preferred embodiment of this utility model, the cantilever short beam 10 is fixed to the pre-embedded steel plate 7 at the beam end by high-strength bolts 14 to achieve a detachable connection, which facilitates construction, installation and subsequent maintenance.

[0050] In one specific embodiment of this utility model, the precast reinforced concrete beam 4 is precast in batches in the factory, the reinforcing ring 8 is welded firmly to the cold-formed high-strength thin-walled round steel pipe 1 in the factory, the two sides of the second end of the cantilever short beam 10 are welded firmly to the embedded steel plate 7 in the factory, the precast steel plate 11 is welded between the lower web plates of the two cantilever short beams 10, and the steel pad 12 is welded to the upper and lower sides of the steel pipe concrete composite column and the precast reinforced concrete beam 4.

[0051] In a preferred embodiment of this utility model, a steel reinforcement cage 6 is installed inside the precast reinforced concrete beam 4. The lower part of the steel reinforcement cage 6 is fixed inside the precast reinforced concrete beam 4 to provide tensile and compressive strength to the beam. The upper part of the steel reinforcement cage 6 is cast in place to form a cast-in-place floor slab overlap 5 with the precast reinforced concrete beam 4. After casting, they can jointly bear the upper load of the precast reinforced concrete beam 4.

[0052] In a specific embodiment of this utility model, the pre-embedded steel plate 7 at the beam end is welded to the reinforcing steel cage 6 and pre-embedded at one end of the precast reinforced concrete beam 4, so that the internal force of the precast reinforced concrete beam 4 can be effectively transmitted to the cantilever short beam 10 through the pre-embedded steel plate 7 at the beam end.

[0053] In a preferred embodiment of this utility model, the strength grade of the cold-formed high-strength thin-walled circular steel pipe 1 is not lower than Q420, so as to ensure that the steel pipe can withstand large loads and deformations; the strength grade of the core high-strength concrete 2 is not lower than C40, and the strength grade of the reinforced concrete 3 is not lower than C40.

[0054] The construction sequence of this utility model is as follows: the steel-concrete composite column is erected on site, followed by the hoisting of the precast reinforced concrete beam 4, and then the hoisting of other components can be carried out without affecting the efficiency of the hoisting machinery. When complete installation is required, the cantilever beam segment and the embedded steel plate can be quickly positioned, and high-strength bolts 14 are passed through the embedded steel plate 7 at the beam end and the cantilever short beam 10, and tightened with nuts. The steel pads 12 on both sides and the brass damping plates 13 are welded on site. Finally, the cast-in-place floor slab composite part 5 is poured in the reserved area of ​​the upper longitudinal reinforcement in the steel reinforcement cage 6. This utility model is suitable for structures with high requirements for construction speed, overall structural performance and seismic performance.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A connection node for a steel-concrete composite column and a precast reinforced concrete beam, characterized in that, The system includes a steel-concrete composite column and a precast reinforced concrete beam (4). The steel-concrete composite column and the precast reinforced concrete beam (4) are connected by a connector. The connector includes two cantilever short beams (10). The first ends of the two cantilever short beams (10) are fixed to the steel-concrete composite column. A precast steel plate (11) is fixedly connected between the lower webs of the cantilever short beams (10). A steel pad (12) is provided on the upper web of the cantilever short beams (10). Beam end embedded steel plates (7) are fixedly provided on both sides of the second ends of the two cantilever short beams (10). The beam end embedded steel plates (7) are fixedly connected to the precast reinforced concrete beam (4).

2. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 1, characterized in that, The steel-concrete composite column includes a cold-formed high-strength thin-walled round steel tube (1), the inside of which is filled with core high-strength concrete (2), and the outside of which is wrapped with reinforced concrete (3); a number of circumferential stiffening ribs (9) are provided between the cold-formed high-strength thin-walled round steel tube (1) and the reinforced concrete (3); two reinforcing rings (8) are fixedly connected to the cold-formed high-strength thin-walled round steel tube (1), and the two reinforcing rings (8) are fixedly connected to the first end of two cantilever short beams (10).

3. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 2, characterized in that, The precast reinforced concrete beam (4) has a steel reinforcement cage (6) installed inside. The lower part of the steel reinforcement cage (6) is fixed inside the precast reinforced concrete beam (4), and the upper part of the steel reinforcement cage (6) is cast in place to form a cast-in-place floor slab overlap (5) with the precast reinforced concrete beam (4).

4. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 3, characterized in that, Brass damping plates (13) are welded to both sides of the steel pad (12).

5. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 4, characterized in that, The circumferential stiffening rib (9) reinforces the cold-formed high-strength thin-walled round steel pipe (1) and reinforced concrete (3) through toothed flanges.

6. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 5, characterized in that, The strength grade of the cold-formed high-strength thin-walled round steel pipe (1) is not lower than Q420.

7. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 6, characterized in that, The strength grade of the core high-strength concrete (2) is not lower than C40.

8. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 7, characterized in that, The strength grade of the reinforced concrete (3) shall not be lower than C40.

9. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 8, characterized in that, The cantilever short beam (10) is fixed to the pre-embedded steel plate (7) at the beam end by high-strength bolts (14).

10. A connection node for a steel-concrete composite column-precast reinforced concrete beam according to claim 9, characterized in that, The pre-embedded steel plate (7) at the beam end is welded to the steel reinforcement cage (6) and pre-embedded at one end of the precast reinforced concrete beam (4).

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