Mixed slag-rubber concrete fabricated beam-column joint and construction method

Abstract

The invention provides a mixed slag-rubber concrete fabricated beam-column joint and a construction method. The beam-column joint comprises a square steel pipe; the circular steel pipe is arranged in the square steel pipe and is coaxial with the square steel pipe; the steel reinforcement framework is arranged in an annular space between the square steel pipe and the circular steel pipe, and the mixed slag-rubber concrete is filled in the annular space to form a composite core column; the I-shaped steel beams connected to the composite core column through the steel outer wrapping beam assemblies form containing spaces matched with the ends of the I-shaped steel beams. The four groups of outer wrapping beams are anchored with the column body through one-way bolts, so that a direct bending moment transmission path is formed; the outer wrapping beams are connected with one another through bolts to form a powerful external constraint steel hoop. And the rigidity, the shear bearing capacity, the torsion resistance and the overall stability of a node domain are remarkably enhanced, so that the node has excellent energy dissipation capacity and anti-seismic performance under the action of complex loads such as earthquakes.

Description

Technical Field

[0001] This invention relates to the field of beam-column joint technology, and more specifically, to a prefabricated beam-column joint made of mixed slag-rubber concrete and its construction method. Background Technology

[0002] In building structural engineering, beam-column joints are key load-bearing components that transfer bending moments and shear forces from beam ends to columns. Their construction form and connection reliability directly affect the overall load-bearing capacity, stiffness, ductility, and seismic performance of the structure. In existing projects, beam-column joints often take the form of reinforced concrete joints or steel-concrete composite joints, and the beam-column connection is achieved through methods such as rebar anchoring, welding, or bolting.

[0003] However, traditional reinforced concrete joints generally suffer from problems such as heavy self-weight, dense reinforcement in the joint area, complex on-site construction procedures, and difficulty in quality control. While some steel-concrete composite joints can reduce self-weight and improve load-bearing capacity, the force transmission path of their connection system may not be direct enough, and the stiffness and strength of the joint area are difficult to meet the requirements of high-rise buildings, large spans, or high seismic fortification. In particular, the bolt connections commonly found in existing composite joints often use uniform specifications and single preload settings, with limited anchorage depth and mainly relying on shear connections of the steel pipe wall. This makes it difficult for the bolt group to form orderly yielding and stable energy dissipation during the stress process, resulting in uneven stress distribution and insufficient constraint on the concrete in the core area of ​​the joint, thereby limiting the ductility and energy dissipation capacity of the joint. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a prefabricated beam-column joint made of mixed slag-rubber concrete and a construction method therefor, so as to solve the above problems.

[0005] The present invention adopts the following solution:

[0006] This application provides a prefabricated beam-column joint using a hybrid slag-rubber concrete structure, comprising a square steel pipe; a circular steel pipe disposed inside the square steel pipe and coaxial with it; a reinforcing steel skeleton arranged in an annular space between the square steel pipe and the circular steel pipe, filled with hybrid slag-rubber concrete to form a composite core column; and an I-beam connected to the composite core column by a steel outer beam assembly; the steel outer beam assembly includes an upper steel outer beam, a lower steel outer beam, a left steel outer beam, and a right steel outer beam, forming a receiving space adapted to the end of the I-beam; wherein each group of steel outer beams is anchored to the square steel pipe by unidirectional high-strength bolts of various lengths; the unidirectional high-strength bolts of various lengths have an anchorage depth gradient and a preload gradient, forming a graded yielding force transmission path.

[0007] Furthermore, the various lengths of the unidirectional high-strength bolts include extra-long unidirectional high-strength bolts, extended unidirectional high-strength bolts, and ordinary unidirectional high-strength bolts; in the installation between the steel outer beam and the square steel pipe, the left and right rows on the front of the installation are connected by the extra-long unidirectional high-strength bolts; the sides of the installation are connected by the extended unidirectional high-strength bolts, and the rest are installed using ordinary unidirectional high-strength bolts; while the steel outer beam and the I-beam are connected using high-strength ordinary bolts.

[0008] Furthermore, at least some of the extra-long unidirectional high-strength bolts have their inner ends located within the reinforcing steel cage.

[0009] Furthermore, the extra-long unidirectional high-strength bolts use a high preload rating, the extended unidirectional high-strength bolts use a medium preload rating, and the standard unidirectional high-strength bolts use a lower preload rating.

[0010] Furthermore, the reinforcing steel cage includes longitudinal main bars arranged around the circular steel pipe and stirrups that restrain the longitudinal main bars.

[0011] Furthermore, the slag powder content in the mixed slag-rubber concrete is 20%, and the rubber particle content is 15%.

[0012] Furthermore, the feature is that replaceable corrugated steel energy-dissipating modules are provided on the critical force transmission paths of the I-beam and the steel outer beam assembly; the corrugated steel energy-dissipating modules are respectively provided at: the upper and lower flanges of the I-beam and the corresponding upper and lower steel outer beams, and at the upper and lower ends of the left and right steel outer beams.

[0013] Furthermore, the corrugated steel energy-consuming module includes an upper constraint steel plate, a connecting steel plate, a corrugated steel plate, and a lower constraint steel plate, and each plate is pre-tightened and assembled by high-strength bolts; the starting load threshold of the corrugated steel energy-consuming module is controlled by the pre-tightening force.

[0014] This application also provides a construction method for prefabricated beam-column joints made of mixed slag-rubber concrete, including the following steps: A prefabricated square steel pipe is used to fix a circular steel pipe coaxially inside it, and a steel reinforcement cage formed by longitudinal main bars and stirrups is arranged between the two. According to the differentiated bolt design, holes matching the unidirectional high-strength bolts are pre-drilled in the square steel pipe; Prepare I-beams and four sets of steel outer beams, and pre-drill connection holes on the steel outer beams; Four sets of steel outer beams are placed on the outer surface of the square steel tube and positioned to align the holes. The ends of the I-beams are then embedded into the accommodating space formed by the four sets of steel outer beams. One-way high-strength bolts are installed through the holes to form a gradient anchoring connection between the steel outer beam and the square steel pipe and its internal composite core column; one-way high-strength bolts are installed at the extended wing plates between the four sets of steel outer beams to form a spatial three-dimensional constraint frame. Install replaceable corrugated steel energy-consuming modules; Mixed slag-rubber concrete is poured between the square steel pipe and the round steel pipe and cured until it reaches the design strength.

[0015] By adopting the above technical solution, the present invention can achieve the following technical effects: Through an innovative "spatial three-dimensional outer beam frame" connection design, an efficient and rigid connection between the I-beams and steel pipe columns is achieved. Four sets of outer beams are anchored to the columns via unidirectional bolts, forming a direct moment transfer path. The outer beams are interconnected by bolts, forming a strong external constraint steel sleeve. This composite structural mechanism of "internal filling and external embracing" significantly enhances the stiffness, shear capacity, torsional resistance, and overall stability of the node region, giving the node excellent energy dissipation capacity and seismic performance under complex loads such as earthquakes. Simultaneously, the introduction of a "anchoring depth-preload" dual-gradient mechanical field design enables active control and optimization of the node's mechanical properties. This design prevents the bolt groups from yielding simultaneously, instead forming an ordered, graded yielding sequence, transforming the node's yielding process from a concentrated, brittle process into a prolonged, controllable, and phased energy dissipation process. This significantly improves the node's deformation capacity and hysteretic energy dissipation capacity under rare earthquakes, resulting in a qualitative leap in its seismic performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a partially exploded structural diagram of a prefabricated beam-column joint made of mixed slag-rubber concrete according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a partially exploded structural diagram of a prefabricated beam-column joint made of mixed slag-rubber concrete according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of a prefabricated beam-column joint structure of mixed slag-rubber concrete according to another embodiment of the present invention; Figure 4This is a top view of a prefabricated beam-column joint made of mixed slag-rubber concrete according to another embodiment of the present invention. Figure 5 This is a side view structural schematic diagram of a prefabricated beam-column joint made of mixed slag-rubber concrete according to another embodiment of the present invention; Figure 6 This is an exploded structural diagram of a corrugated steel energy-dissipating module for a prefabricated beam-column joint of a mixed slag-rubber concrete according to another embodiment of the present invention. Figure 7 This is a structural schematic diagram of various unidirectional high-strength bolts for a prefabricated beam-column joint made of mixed slag-rubber concrete according to an embodiment of the present invention. Figure 8 This is a construction flowchart of a prefabricated beam-column joint made of mixed slag-rubber concrete according to an embodiment of the present invention.

[0018] Icons: 1. Circular steel pipe column; 2. Mixed slag-rubber concrete; 3. Upper steel outer beam; 4. Lower steel outer beam; 5. Left steel outer beam; 6. Right steel outer beam; 7. Extra-long unidirectional high-strength bolt; 8. Extended unidirectional high-strength bolt; 9. Ordinary unidirectional high-strength bolt; 10. High-strength ordinary bolt; 11. Longitudinal main reinforcement; 12. Stirrup; 13. Lower restraint steel plate; 14. First corrugated steel plate; 15. Connecting steel plate; 16. Second corrugated steel plate; 17. Upper restraint steel plate; 18. I-beam; 19. Corrugated steel energy-consuming module; 20. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example Combination Figures 1 to 7As shown, this embodiment provides a prefabricated beam-column joint made of mixed slag-rubber concrete, comprising: a square steel pipe; a circular steel pipe 2 disposed inside the square steel pipe and coaxial with it; a reinforcing steel skeleton arranged in the annular space between the square steel pipe and the circular steel pipe 2, filled with mixed slag-rubber concrete 3 to form a composite core column; and an I-beam 19 connected to the composite core column by a steel outer beam assembly; the steel outer beam assembly includes an upper steel outer beam 4, a lower steel outer beam 5, a left steel outer beam 6, and a right steel outer beam 7, forming a receiving space adapted to the end of the I-beam 19; wherein, each group of steel outer beams is anchored to the square steel pipe by unidirectional high-strength bolts of various lengths; the unidirectional high-strength bolts of various lengths have an anchorage depth gradient and a preload gradient, forming a graded yielding force transmission path.

[0021] In this embodiment, the reinforcing steel cage includes longitudinal main bars 12 arranged around the circular steel pipe 2 and stirrups 13 that constrain the longitudinal main bars 12.

[0022] like Figure 1 and Figure 2 As shown, the upper steel outer beam 4, lower steel outer beam 5, left steel outer beam 6, and right steel outer beam 7 are welded together from steel plates. The various lengths of the unidirectional high-strength bolts include extra-long unidirectional high-strength bolts 8, extended unidirectional high-strength bolts 9, and standard unidirectional high-strength bolts 10; as... Figure 2 and Figure 7 As shown, in the installation between the steel outer beam and the square steel pipe, the left and right rows on the front of the installation are connected by the extra-long unidirectional high-strength bolts 8; the sides are connected by extended unidirectional high-strength bolts 9; and the rest are installed using ordinary unidirectional high-strength bolts 10. At least some of the extra-long unidirectional high-strength bolts 8 have their inner ends within the reinforcing steel frame. Simultaneously, the extra-long unidirectional high-strength bolts 8 use a high preload rating, the extended unidirectional high-strength bolts 9 use a medium preload rating, and the ordinary unidirectional high-strength bolts 10 use a low preload rating, ensuring a firm, gradient anchorage between the steel outer beam, the steel pipe column, and the internal concrete core area. The steel outer beam is connected to the I-beam 19 using high-strength ordinary bolts 11. Specifically, after the I-beam 19 is in place, the high-strength ordinary bolts 11 are used to secure the extended flanges that overlap with the steel outer beam. Four sets of independent steel outer beams are connected to form a rigid spatial frame, thereby firmly fixing the I-beam 19.

[0023] The above innovative "spatial three-dimensional outer beam frame" connection design achieves an efficient and rigid connection between the I-beam 19 and the steel pipe column. The four sets of outer beams are anchored to the column via unidirectional bolts, forming a direct moment transfer path; the steel outer beams are interconnected by bolts, forming a strong external constraint steel sleeve. This composite structural mechanism of "internal filling and external embracing" significantly enhances the stiffness, shear capacity, torsional resistance, and overall stability of the node region, giving the node excellent energy dissipation capacity and seismic performance under complex loads such as earthquakes.

[0024] Furthermore, a dual-gradient mechanical field design based on "anchoring depth-preload" was introduced, enabling active control and optimization of the joint's mechanical properties. This design prevents the bolt group from yielding simultaneously, instead forming an ordered, graded yielding sequence. This transforms the yielding process of the joint from a concentrated, brittle process into a protracted, controllable, and staged energy-dissipating process. This significantly improves the joint's deformation capacity and hysteretic energy dissipation capacity under rare earthquakes, resulting in a qualitative leap in its seismic performance.

[0025] In this embodiment, the slag powder content in the mixed slag-rubber concrete 3 is 20%, and the rubber particle content is 15%. This mix design significantly improves the material's ultimate deformation capacity and toughness while ensuring the required strength in the core area of ​​the joint. When applied to the "triaxial constraint" core area of ​​this scheme, it works in conjunction with the gradient bolt anchoring system to more effectively suppress brittle spalling of the concrete and fully dissipate seismic energy, thereby significantly enhancing the overall ductility and seismic toughness of the joint from the material's fundamental source.

[0026] Preferably, in this embodiment, a replaceable corrugated steel energy-dissipating module 20 is provided on the critical force transmission path between the I-beam 19 and the steel outer beam assembly; such as Figures 3 to 6 As shown, the corrugated steel energy-consuming modules 20 are respectively disposed between the upper and lower flanges of the I-beam 19 and the corresponding upper and lower steel outer beams 4 and 5, as well as at the upper and lower ends of the left and right steel outer beams 6 and 7. Specifically, the corrugated steel energy-consuming module 20 includes an upper restraining steel plate 18, a connecting steel plate 16, a corrugated steel plate, and a lower restraining steel plate 14. Each plate is pre-tightened and assembled by high-strength bolts; the starting load threshold of the corrugated steel energy-consuming module 20 is controlled by the pre-tightening force.

[0027] By introducing replaceable energy-dissipating modules based on corrugated steel, the system gains the ability to control node damage and ensure post-earthquake recovery. Its working mechanism is as follows: when the seismic load exceeds the module's preset activation threshold, the corrugated steel plate efficiently dissipates the seismic input energy through the reciprocating bending deformation of its folded structure, thus achieving node damage control and post-earthquake recovery. The module precisely controls its activation load through preload, prioritizing the dissipation of a large amount of energy through the elastic deformation of the corrugated steel during an earthquake, effectively protecting the main structure from damage. Corrugated steel has characteristics such as clear stress distribution, good fatigue performance, and recoverable deformation, making the energy-dissipating module more stable and reliable. After an earthquake, only modules with residual deformation need to be replaced to restore the node to its original performance, greatly reducing maintenance costs and time, and achieving a leap forward in seismic design concepts.

[0028] This application also provides a construction method for a prefabricated beam-column joint using a mixture of slag and rubber concrete, comprising the following steps: A prefabricated square steel pipe is used to fix a circular steel pipe 2 coaxially inside it, and a steel reinforcement cage formed by longitudinal main bars 12 and stirrups 13 is arranged between the two. According to the differentiated bolt design, holes matching the unidirectional high-strength bolts are pre-drilled in the square steel pipe; Prepare I-beam 19 and four sets of steel outer beams, and pre-drill connection holes on the steel outer beams; Four sets of steel outer beams are placed on the outer surface of the square steel tube and positioned to align the holes. The ends of the I-beam 19 are then embedded into the accommodating space formed by the four sets of steel outer beams. One-way high-strength bolts are installed through the holes to form a gradient anchoring connection between the steel outer beam and the square steel pipe and its internal composite core column; one-way high-strength bolts are installed at the extended flanges between the four sets of steel outer beams to form a spatial three-dimensional constraint frame; firstly, using a torque wrench or hydraulic torque tensioner, all ordinary specification bolts are tightened to their lower preload according to the design values. Then, all extended specification bolts are tightened to their medium preload in a symmetrical sequence. Finally, all extra-long specification bolts are tightened to their high preload in the same symmetrical sequence. Install the replaceable corrugated steel energy-consuming module 20; specifically, first align the reserved holes of each component of the module; then, stack the lower constraint steel plate 14, the first corrugated steel plate 15, the two connecting steel plates 16, the second corrugated steel plate 17, and the upper constraint steel plate 18 from bottom to top to ensure that each plate is accurately aligned; finally, insert the high-strength ordinary bolts 11 and tighten them to the designed torque. Mixed slag-rubber concrete 3 is poured between the square steel pipe and the round steel pipe 2 and cured until it reaches the design strength.

[0029] The components of this invention are easy to standardize and manufacture, and the on-site installation process is clear. The method of connecting the steel outer beam with bolts effectively reduces on-site welding work, lowers construction difficulty, improves construction efficiency, and helps ensure the final quality and reliability of the node connection.

[0030] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this invention, 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 or an electrical 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 invention according to the specific circumstances.

[0034] 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 below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A prefabricated beam-column joint made of mixed slag-rubber concrete, characterized in that, The system includes a square steel pipe; a circular steel pipe (2) disposed inside the square steel pipe and coaxial with it; a steel reinforcement skeleton arranged in the annular space between the square steel pipe and the circular steel pipe (2), and a mixed slag-rubber concrete (3) filled in the annular space to form a composite core column; and an I-beam (19) connected to the composite core column by a steel outer beam assembly; the steel outer beam assembly includes an upper steel outer beam (4), a lower steel outer beam (5), a left steel outer beam (6) and a right steel outer beam (7), forming a receiving space adapted to the end of the I-beam (19); wherein, each group of steel outer beams is anchored to the square steel pipe by unidirectional high-strength bolts of various lengths; the unidirectional high-strength bolts of various lengths have an anchorage depth gradient and a preload gradient, forming a graded yielding force transmission path.

2. The prefabricated beam-column joint of mixed slag-rubber concrete according to claim 1, characterized in that, The various lengths of the unidirectional high-strength bolts include extra-long unidirectional high-strength bolts (8), extended unidirectional high-strength bolts (9), and ordinary unidirectional high-strength bolts (10); in the installation between the steel outer beam and the square steel pipe, the left and right rows on the front of the installation are connected by the extra-long unidirectional high-strength bolts (8); the sides of the installation are connected by the extended unidirectional high-strength bolts (9), and the rest are installed using the ordinary unidirectional high-strength bolts (10); while the steel outer beam and the I-beam (19) are connected by high-strength ordinary bolts (11).

3. The prefabricated beam-column joint of mixed slag-rubber concrete according to claim 2, characterized in that, At least part of the extra-long unidirectional high-strength bolts (8) have their inner ends inside the reinforcing steel cage.

4. The prefabricated beam-column joint of mixed slag-rubber concrete according to claim 2, characterized in that, The extra-long unidirectional high-strength bolt (8) adopts a high preload grade, the extended unidirectional high-strength bolt (9) adopts a medium preload grade, and the ordinary unidirectional high-strength bolt (10) adopts a low preload grade.

5. The prefabricated beam-column joint of mixed slag-rubber concrete according to claim 1, characterized in that, The steel reinforcement cage includes longitudinal main bars (12) arranged around the circular steel pipe (2) and stirrups (13) that restrain the longitudinal main bars (12).

6. The prefabricated beam-column joint of mixed slag-rubber concrete according to claim 1, characterized in that, The slag powder content in the mixed slag-rubber concrete (3) is 20%, and the rubber particle content is 15%.

7. The prefabricated beam-column joint of mixed slag-rubber concrete according to any one of claims 1-6, characterized in that, Replaceable corrugated steel energy-consuming modules (20) are installed on the key force transmission path of the I-beam (19) and the steel outer beam assembly; the corrugated steel energy-consuming modules (20) are respectively installed between the upper flange and lower flange of the I-beam (19) and the corresponding upper steel outer beam (4) and lower steel outer beam (5), and at the upper and lower ends of the left steel outer beam (6) and the right steel outer beam (7).

8. The prefabricated beam-column joint of mixed slag-rubber concrete according to claim 7, characterized in that, The corrugated steel energy dissipation module (20) includes an upper constraint steel plate (18), a connecting steel plate (16), a corrugated steel plate, and a lower constraint steel plate (14). Each plate is assembled by pre-tightening with high-strength bolts. The starting load threshold of the corrugated steel energy dissipation module (20) is controlled by the pre-tightening force.

9. A construction method for a prefabricated beam-column joint using mixed slag-rubber concrete as described in claim 8, characterized in that, Includes the following steps: A prefabricated square steel pipe is used to fix a circular steel pipe (2) coaxially inside it, and a steel reinforcement skeleton formed by longitudinal main bars (12) and stirrups (13) is arranged between the two. According to the differentiated bolt design, holes matching the unidirectional high-strength bolts are pre-drilled in the square steel pipe; Prepare I-beams (19) and four sets of steel outer beams, and pre-drill connection holes on the steel outer beams; Four sets of steel outer beams are placed on the outer surface of the square steel pipe and positioned to align the holes. The end of the I-beam (19) is embedded into the accommodating space formed by the four sets of steel outer beams. One-way high-strength bolts are installed through the holes to form a gradient anchoring connection between the steel outer beam and the square steel pipe and its internal composite core column; one-way high-strength bolts are installed at the extended wing plates between the four sets of steel outer beams to form a spatial three-dimensional constraint frame. Install replaceable corrugated steel energy dissipation modules (20); Mixed slag-rubber concrete (3) is poured between the square steel pipe and the round steel pipe (2) and cured until it reaches the design strength.

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