A combined connecting device of reinforced concrete beam and steel pipe concrete column

Abstract

This utility model discloses a combined connection device for reinforced concrete beams and concrete-filled steel tube columns, including a reinforced concrete beam and a concrete-filled steel tube column. It also includes a reinforcement connection module located within the reinforced concrete beam and used to connect the reinforcement within the beam to the concrete-filled steel tube column, a shear force transfer module located within the reinforced concrete beam and connected to the concrete-filled steel tube column, and an in-column reinforcement module located within the concrete-filled steel tube column and corresponding to the position of the reinforced concrete beam. This utility model offers high force transfer efficiency, simple construction, superior mechanical properties of the beam-column joint, and easily guaranteed construction quality.

Description

Technical Field

[0001] This utility model relates to the technical field of building structures, and in particular to a combined connection device for reinforced concrete beams and steel-concrete composite columns. Background Technology

[0002] With increasingly scarce urban land resources, continuously rising building heights, and ever-increasing demands for industrialization in the construction industry, steel sections are cleverly placed around the concrete sections to effectively control the cross-sectional dimensions of the building's base frame columns, improve structural efficiency, and increase the prefabrication rate. This results in steel-concrete composite columns that combine strength and rigidity. However, in the pursuit of a balance between economic efficiency and technical feasibility, floor systems often utilize mature and economical reinforced concrete structures. In the combination of steel-concrete composite columns and reinforced concrete floor systems, the connection structure between the steel-concrete composite columns and reinforced concrete beams becomes paramount in controlling the mechanical properties of the joints and the construction quality, serving as a core element in ensuring the safety and reliability of the building structure.

[0003] Concrete-filled steel tubular (CFST) columns combine the high strength of steel tubing with the compressive strength of concrete, making them widely used in high-rise buildings and large-span structures. However, the connection between CFST columns and reinforced concrete beams has always been a design challenge, due to both the complexity of the joint structure and the difficulty in assessing load transfer efficiency, as well as the high difficulty of construction. According to the "Code for Design of Composite Structures" JGJ138-2016 and the "Technical Specification for Concrete-filled Steel Tube Structures" GB 50936-2014, common connection systems currently include: ring beam steel bearing pin connection system, perforated through-reinforcement connection system, and steel bracket connection system.

[0004] Ring beam steel load-bearing pin connection: The node adopts an octagonal reinforced concrete ring beam set outside the column, and the longitudinal reinforcement of the reinforced concrete beam is anchored into the ring beam to transfer bending moment; shear force is transferred to the core area of ​​the column through a semi-through steel bracket (load-bearing pin) welded to the steel pipe wall. However, its disadvantages are: the size of the column head ring beam is increased, which has a great impact on the building's functionality; the through-type load-bearing pin requires penetrating the steel pipe, which is difficult to construct; the non-through-type is prone to stress concentration or even tearing of the steel pipe wall; although the semi-through type is a compromise, there is still a risk of local weld fatigue.

[0005] Through-hole reinforcement connection: This method involves directly passing the longitudinal reinforcement of the reinforced concrete beam through the wall of a rectangular steel pipe column to form a rigid connection. Its disadvantages are: weakened steel pipe wall, significantly reduced local load-bearing capacity due to the opening, requiring additional reinforcement measures (such as thickening the pipe wall), increasing material costs; difficult construction, with challenges in positioning the reinforcement through the pipe, and concrete pouring easily clogging the holes, affecting compaction; poor joint ductility, lack of shear force transfer components within the concrete beam, multiple layers of reinforcement within the steel pipe hindering concrete pouring and vibration, affecting the construction quality and safety of the column; brittle cracking is prone to occur around the hole under high shear forces; insufficient friction between the concrete beam and the outer wall of the steel pipe column to provide adequate shear resistance, forcing the longitudinal reinforcement to participate in shear resistance, resulting in insufficient seismic performance.

[0006] Steel corbel connection: Steel corbels are installed at the joint locations of steel pipe columns to transfer the bending moment and shear force of the reinforced concrete beam. Its disadvantages are: welding between the reinforced concrete beam and the steel pipe column corbel is difficult, especially with multiple rows of reinforcing bars, which can lead to problems such as overhead welding, making it difficult to guarantee construction quality; the flange portion of the steel corbel within the steel beam inevitably excessively strengthens the bending capacity of the beam end, making it impossible to implement the "strong shear, weak bending" ductile energy dissipation seismic system, resulting in a decrease in the overall structural safety and reliability during earthquakes. Utility Model Content

[0007] Purpose of the utility model: The purpose of this utility model is to provide a combined connection device for reinforced concrete beams and steel-concrete composite columns with high force transmission efficiency, superior mechanical properties of beam-column joints, and easy assurance of construction efficiency and quality.

[0008] Technical solution: To achieve the above objectives, this utility model discloses a combined connection device for reinforced concrete beams and steel-concrete composite columns, including a reinforced concrete beam and a steel-concrete composite column, and further including a reinforcement connection module located inside the reinforced concrete beam and used to connect the reinforcement in the beam to the steel-concrete composite column, a shear force transfer module located inside the reinforced concrete beam and connected to the steel-concrete composite column, and an in-column reinforcement module located inside the steel-concrete composite column and corresponding to the position of the reinforced concrete beam.

[0009] Optionally, the rebar connection module includes a steel support fixed to the outer wall of the steel pipe of the steel-concrete composite column, a sleeve threaded to the steel support, and an end steel ring adapted to the end of the sleeve near the steel support. The steel support includes a support bottom, a connecting shaft for passing through the sleeve, and a connecting threaded shaft located at the end of the connecting shaft and mating with the internal thread of the sleeve and the threaded section of the rebar in the beam. The upper part of the sleeve is provided with a temporary reinforcement assembly for temporarily fixing and supporting the rebar in the beam to be connected.

[0010] Optionally, the temporary scaffolding assembly includes at least two sets of elastic clamping assemblies, each set having at least four elastic clamping assemblies evenly distributed around the center, with adjacent sets of elastic clamping assemblies being staggered.

[0011] Optionally, the elastic clamping assembly includes a partially threaded slot on the sleeve, a steel ball located in the slot and stopped by the lower end of the slot, a nut located at the upper end of the slot and threadedly connected to the slot, and a spring whose upper end abuts against the nut and whose lower end abuts against the steel ball.

[0012] Optionally, the end steel ring includes two matching half steel rings, end ring mating points located on the half steel rings, and end ring protrusions for connecting the sleeve, wherein the sleeve is provided with end ring grooves that match the end ring protrusions.

[0013] Optionally, a rubber washer is fitted on the connecting optical axis, and the sleeve is tightened until the end steel ring presses against the rubber washer.

[0014] Optionally, the shear force transfer module includes a shear force transfer steel plate fixed to the outer wall of the steel tube of the concrete-filled steel tube column, steel plate through holes on the shear force transfer steel plate, and a three-dimensional mesh-like shear force transfer steel cage that passes through the steel plate through holes and forms a cage surrounding the shear force transfer steel plate.

[0015] Optionally, the column reinforcement module includes a latitudinal reinforcement plate and a radial reinforcement plate installed inside the steel tube concrete column and matched with the shear force transmission steel plate on the outside of the column. Both the latitudinal and radial reinforcement plates are provided with reserved holes to facilitate the flow of concrete.

[0016] Optionally, the latitudinal reinforcing plates and radial reinforcing plates are arranged in a grid or cross shape.

[0017] Optionally, the reinforcement in the beam includes top longitudinal reinforcement, torsional reinforcement, and bottom longitudinal reinforcement.

[0018] Beneficial Effects: Compared with the prior art, this utility model has the following advantages: The steel reinforcement inside the reinforced concrete beam of this utility model is mechanically connected to the steel-concrete composite column through a steel reinforcement connection module, ensuring efficient force transmission and anchorage quality of the reinforcement; the sleeve and steel support of the steel reinforcement connection module in this utility model achieve a self-rotating elongation connection, and the temporary reinforcement assembly on the sleeve enables temporary fixing of the reinforcement, facilitating quick and convenient construction and avoiding the difficulties of rotating and moving the reinforcement in traditional sleeves, as well as the cumbersome nature and difficulty in ensuring construction quality of traditional welding methods; the steel-concrete composite column joint area of ​​this utility model is equipped with a vertical "+" or "well" shaped internal column strengthening module, replacing the traditional horizontal transverse strengthening plate, and paired with the shear force transmission steel plate of the shear force transmission module at the external beam end of the column, continuously transmitting shear force to the joint area; the strengthening plate in this utility model further improves the shear resistance and ductility of the joint, thereby providing its seismic performance; the steel-concrete composite column joint area of ​​this utility model... Without through-reinforced bars or horizontal ring plates within the soil column, the quality of concrete pouring and vibration within the column is easily guaranteed. As an important vertical component, the column should prioritize reliability and seismic performance compared to beams. The density and quality of concrete pouring within the steel-tube concrete column (especially in high-rise and super high-rise buildings) are extremely critical. This invention features a shear force transfer module at the beam end outside the joint, transferring the shear force in the concrete beam from the concrete-reinforcement cage to a vertical shear force transfer steel plate within the reinforcement cage. This vertical shear force transfer steel plate connects to the column steel plate and is paired with the internal reinforcement plate, thus achieving an efficient and reliable connection method for collecting shear force from the beam end and transferring it to the column through the beam-column joint. The shear force transfer module of this invention can be prefabricated, avoiding the difficulties of on-site three-dimensional reinforcement cage processing and assembly, and ensuring connection and processing quality. Compared to the conventional steel plate + stud system, it can further expand the shear stress collection range and avoid safety hazards caused by local stress concentration during shear force transfer. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the connection of the reinforcing bars within the nodes in this utility model; Figure 3 This is a schematic diagram of the steel bar connection module before the sleeve is tightened in this utility model; Figure 4 This is a schematic diagram of the sleeve of the steel bar connection module after it is tightened in this utility model; Figure 5 This is a structural schematic diagram of the temporary support frame assembly of the sleeve in this utility model; Figure 6 for Figure 5 Schematic diagram of the cross section at point FF; Figure 7 for Figure 5 Schematic diagram of the cross-section at point GG; Figure 8 for Figure 5 Schematic diagram of the cross-section at point HH; Figure 9 This is a schematic diagram showing the connection between the sleeve and the end steel ring in this utility model; Figure 10 This is a schematic diagram of the installation of the steel ring at the middle end of this utility model; Figure 11 for Figure 2 Schematic diagram of the cross section at point AA; Figure 12 for Figure 2 Schematic diagram of the cross section at point BB; Figure 13 for Figure 11 Schematic diagram of the cross section at point C; Figure 14 for Figure 12 Schematic diagram of the cross section at point DD; Figure 15 for Figure 12 Schematic diagram of the cross section at EE; In the diagram: 1. Top longitudinal reinforcement; 2. Torsional reinforcement; 3. Steel pipe concrete column; 4. Reinforcement connection module; 4. Steel support; 41. Sleeve; 42. End ring groove; 421. Steel ball; 43. Nut; 44. Spring; 45. Rubber washer; 46. End steel ring; 47. End ring protrusion; 471. End ring mating point; 472. Shear force transfer module; 5. Shear force transfer steel plate; 51. Shear force transfer reinforcement cage; 52. Steel plate through-hole; 53. Bottom longitudinal reinforcement; 6. Column internal reinforcement module; 7. Latent reinforcement plate; 71. Radial reinforcement plate; 72. Reserved hole; 73. Reinforced concrete beam; 8. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0021] It should be understood that this invention can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of the components may be exaggerated. The same reference numerals denote the same components throughout.

[0022] like Figure 1 and Figure 2As shown, a combined connection device for reinforced concrete beam and steel-concrete composite column in this embodiment includes a reinforced concrete beam 8, a steel-concrete composite column 3, a steel reinforcement connection module 4, a shear force transfer module 5, and an internal column reinforcement module 7. The reinforced concrete beam 8 is provided with internal steel reinforcement, which includes a top longitudinal steel reinforcement 1, a torsional steel reinforcement 2, and a bottom longitudinal steel reinforcement 6.

[0023] The rebar connection module 4 is located inside the reinforced concrete beam 8. The rebar connection module 4 is used to connect the rebar in the beam to the steel pipe concrete column 3. The rebar connection module 4 includes a steel support 41, a sleeve 42, a steel ball 43, a nut 44, a spring 45, a rubber washer 46, and an end steel ring 47.

[0024] like Figure 3 and Figure 4 As shown, the rebar connection module 4 is a connecting device used to connect the rebar in the beam to the steel-concrete composite column 3. The steel support 41 of the rebar connection module 4 is welded to the steel pipe plate of the steel-concrete composite column 3, and the position of the steel support 41 is aligned with the rebar in the beam to be connected. The steel support 41 includes a support bottom, a connecting optical shaft for inserting a sleeve, and a connecting threaded shaft located at the end of the connecting optical shaft and mating with the internal thread of the sleeve. The diameter of the connecting threaded shaft is larger than the diameter of the connecting optical shaft. The sleeve 42 is threadedly connected to the steel support. The inner wall of the sleeve 42 is provided with a threaded section and a smooth hole section. A temporary reinforcement assembly for temporarily fixing and supporting the rebar in the beam to be connected is provided at the smooth hole section of the sleeve 42. The threaded section of the sleeve 42 is used to thread-connect the connecting threaded shaft of the steel support 41 and the end of the rebar in the beam. The end of each rebar in the beam is provided with a threaded section for connection. Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the temporary scaffolding assembly includes at least two sets of elastic clamping components, each set having at least four elastic clamping components evenly distributed around the center, with adjacent sets of elastic clamping components staggered. Each elastic clamping component includes a partially threaded slot on the sleeve, steel balls 43, a nut 44, and a spring 45. The steel balls 43 are located within the slot and are stopped by the lower end of the slot, meaning the lower diameter of the slot is smaller than the diameter of the steel balls 43. The nut 44 is located at the upper end of the slot and has external threads, connecting to the slot threadedly. The upper end of the spring 45 abuts against the nut 44, and the lower end of the spring 45 abuts against the steel balls 43. A rubber washer 46 is fitted onto the connecting shaft of the steel support 41. Tightening the sleeve 42 until the end steel ring 47 presses against the rubber washer 46 is achieved. Figure 9 and Figure 10As shown, the end steel ring 47 is adapted to the end of the sleeve 42 near the steel support 41. The end steel ring 47 includes two adapted half steel rings. The half steel rings are provided with end ring mating points 472 and end ring protrusions 471 for connecting the sleeve. The sleeve 42 is provided with end ring grooves 421 adapted to the end ring protrusions.

[0025] The sleeve 42 is connected to the steel support 41 via a spiral thread, and its extension relationship with the steel support 41 can be adjusted by rotation. The extension relationship is between the sleeve 42 pressing against the base of the steel support 41 to the right and the sleeve 42 pressing against the rubber washer 46 to the left. The rubber washer 46 is located at the end of the connecting thread shaft of the steel support 41 to prevent potential damage to the threads caused by mechanical compression between the steel support 41 and the sleeve 42. The sleeve 42 is adjusted to the right-facing position against the base of the steel support 41 when the rebar connection module 4 leaves the factory. The outer side of the sleeve 42 has a shape that matches a construction wrench to facilitate the rotation and tightening of the sleeve 42 itself. The length of the threaded section of the sleeve 42 can cover the length required for the connection between the sleeve 42 and the steel support 41 via thread engagement, plus the length required for the connection between the sleeve 42 and the rebar in the beam via thread engagement. The inner diameter of the open section of the sleeve 42 is slightly larger than the outer diameter of the reinforcing bar to be connected, generally by 2-4 mm. To facilitate temporary fixing and erection of the reinforcing bar and ensure reliable pre-alignment, the temporary support assembly of the sleeve 42 is equipped with a set of elastic clamping components, four in a group, for a total of two groups. Each elastic clamping component consists of a steel ball 43, a nut 44, and a spring 45. During implementation, a threaded groove is first made at the sleeve 42, with a groove diameter slightly larger than the steel ball 43. The thread of the groove matches the nut 44. The inner diameter of the groove decreases towards the inside of the sleeve, reducing it to slightly less than the diameter of the steel ball 43 by 1 mm. Then, the steel ball 43 is installed into the groove, followed by the spring 45, and finally the nut 44 is tightened. The end steel ring 47 is used to clearly define the stopping position of the sleeve 42 during tightening, preventing uneven thread engagement caused by excessive tightening. During implementation, the sleeve 42 is first screwed onto the steel support 41 at the factory. Then, the two halves of the end steel ring 47 are placed on the steel rod of the steel support 41 and joined together. During joining, the mating points 472 of the end rings are matched. After joining, the sleeve 42 is pushed into the steel rod of the steel support 41, so that the end ring protrusion 471 of the end steel ring 47 is inserted into the sleeve 42 and engages with the end ring groove 42. After being inserted to the bottom, it is rotated counterclockwise until tightened, and the installation is completed. When the reinforcing bars are temporarily erected, the reinforcing bars are inserted into the open section of the sleeve 42. The temporary reinforcing bar assembly initially fixes the reinforcing bars, making it easy for construction personnel to tighten the sleeve 42. Before the sleeve 42 is tightened, the reinforcing bars have been tied to the stirrups and other reinforcing bars and generally cannot be moved. The reinforcing bar connection is completed when the sleeve 42 is tightened until the end steel ring 47 and the rubber washer 46 are close together and cannot be tightened any further.

[0026] like Figure 12 , Figure 14 and Figure 15As shown, the shear force transfer module 5 is located inside the reinforced concrete beam 8 and is connected to the steel-concrete composite column 3. The shear force transfer module 5 includes a shear force transfer steel plate 51, a shear force transfer reinforcing cage 52, and reinforcing bar through holes 53 in the steel plate. The shear force transfer steel plate 51 is fixed to the outer wall of the steel pipe of the steel-concrete composite column, and the shear force transfer reinforcing cage 52 passes through the reinforcing bar through holes 53 in the steel plate to form a three-dimensional mesh cage covering the shear force transfer steel plate 51. The shear force transfer steel plate 51 is welded to the outer steel pipe plate of the steel-concrete composite column 3, and is generally set in groups. The shear force transfer steel plate 51 is provided with steel plate through holes 53. The number of steel plate through holes 53 depends on the shear force transfer requirements. The reinforcing bars are arranged in a three-dimensional mesh cage and pass through the shear force transfer steel plate 51. The shear force transfer steel plate 51 is covered in the reinforcing cage. The intersection of the multi-directional reinforcing bars in the reinforcing cage is fixed with steel wire to complete the installation of the shear force transfer module. The diameter of the reinforcing bars is the same as that of the beam stirrups or generally ribbed reinforcing bars with a diameter of 8mm. The diameter of the through holes 53 is larger than the diameter of the reinforcing bars in the shear force transfer reinforcing cage 52.

[0027] like Figure 11 and Figure 13 As shown, the internal reinforcement module 7 is located inside the steel-concrete composite column, corresponding to the position of the reinforced concrete beam 8. Latent reinforcement plates 71 and radial reinforcement plates 72 are installed inside the steel-concrete composite column, forming a grid or cross shape. Both latent and radial reinforcement plates 71 and 72 have pre-drilled holes 73 to facilitate concrete flow. The internal reinforcement module 7 consists of several vertical or perpendicular reinforcement plates; the reinforcement plates are welded to the steel pipe plates of the steel-concrete composite column 3, thus completing the installation of the internal reinforcement module 7. The position of the reinforcement plates corresponds to the reinforced concrete beam; the height of the plates can cover the height of the connected beam, and the horizontal position can be covered by the width of the connected beam. The reserved hole 73 is set so that after the prefabrication and transportation of this combined connection system to the site for installation, the concrete can flow fully and fill the column and its joint area during the concrete pouring of the steel pipe concrete column and its joint area; the use of a vertical reinforcing plate instead of a conventional horizontal reinforcing plate in this utility model is also to achieve and strengthen this purpose, so as to fully ensure the quality and safety of the primary vertical components.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A combined connection device for a reinforced concrete beam and a steel-concrete composite column, comprising a reinforced concrete beam (8) and a steel-concrete composite column (3), characterized in that: It also includes a steel reinforcement connection module (4) located inside the reinforced concrete beam and used to connect the steel reinforcement in the beam to the steel tube concrete column, a shear force transfer module (5) located inside the reinforced concrete beam and connected to the steel tube concrete column, and a column reinforcement module (7) located inside the steel tube concrete column and corresponding to the position of the reinforced concrete beam.

2. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 1, characterized in that: The steel reinforcement connection module (4) includes a steel support (41) fixed to the outer wall of the steel pipe of the steel pipe concrete column (3), a sleeve (42) threadedly connected to the steel support, and an end steel ring (47) adapted to the end of the sleeve near the steel support. The steel support (41) includes a support bottom, a connecting optical shaft for passing through the sleeve, and a connecting threaded shaft located at the end of the connecting optical shaft and cooperating with the internal thread of the sleeve and the threaded section of the steel reinforcement in the beam. The upper part of the sleeve (42) is provided with a temporary reinforcement assembly for temporarily fixing and erecting the steel reinforcement in the beam to be connected.

3. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 2, characterized in that: The temporary scaffolding assembly includes at least two sets of elastic clamping assemblies, each set having at least four elastic clamping assemblies evenly distributed around the center, with adjacent sets of elastic clamping assemblies being staggered.

4. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 3, characterized in that: The elastic clamping assembly includes a partially threaded slot on the sleeve, a steel ball (43) located in the slot and stopped by the lower end of the slot, a nut (44) located at the upper end of the slot and threadedly connected to the slot, and a spring (45) whose upper end abuts against the nut and whose lower end abuts against the steel ball.

5. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 2, characterized in that: The end steel ring (47) includes two matching half steel rings, an end ring mating point (472) located on the half steel ring, and an end ring protrusion (471) for connecting the sleeve. The sleeve (42) is provided with an end ring groove (421) that matches the end ring protrusion.

6. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 2, characterized in that: A rubber washer (46) is fitted on the connecting optical axis, and the sleeve (42) is tightened until the end steel ring (47) presses the rubber washer (46).

7. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 1, characterized in that: The shear force transfer module (5) includes a shear force transfer steel plate (51) fixed to the outer wall of the steel pipe of the steel pipe concrete column, a steel plate through hole (53) on the shear force transfer steel plate, and a three-dimensional mesh cage-like shear force transfer steel cage (52) that passes through the steel plate through hole and forms a surrounding shear force transfer steel plate.

8. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 7, characterized in that: The column reinforcement module (7) includes a latitudinal reinforcement plate (71) and a radial reinforcement plate (72) installed inside the steel tube concrete column and matched with the shear force transmission steel plate on the outside of the column. Both the latitudinal reinforcement plate (71) and the radial reinforcement plate (72) are provided with reserved holes (73) to facilitate the flow of concrete.

9. A combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 8, characterized in that: The latitudinal reinforcing plate (71) and the radial reinforcing plate (72) are arranged in a grid or cross shape.

10. The combined connection device for reinforced concrete beams and steel-concrete composite columns according to claim 1, characterized in that: The steel reinforcement in the beam includes top longitudinal reinforcement (1), torsional reinforcement (2), and bottom longitudinal reinforcement (6).

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