Concrete filled steel tube-steel tube vertical mixed structure system

Abstract

The invention relates to the technical field of building structures, in particular to a concrete filled steel tube-steel tube vertical mixed structure system which comprises a plurality of concrete filled steel tube columns, a plurality of steel tube columns and a plurality of concrete filled steel tube column-steel tube column connecting pieces. The steel pipe columns and the steel pipe concrete columns are fixedly connected through steel pipe concrete column-steel pipe column connecting pieces. According to the concrete-filled steel tube-steel tube vertical mixed structure system, direct connection between the steel tube columns and the concrete-filled steel tube columns is achieved through the concrete-filled steel tube column-steel tube column connecting pieces, the tedious construction process that the steel tube columns need to be inserted into the concrete-filled steel tube columns in a traditional method is avoided, the construction process is greatly simplified, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, and in particular to a steel tube concrete-steel tube vertical mixed structure system. Background Art

[0002] The steel tube concrete column consists of an outer steel tube and inner filling concrete. The outer steel tube changes its buckling mode and its bearing capacity is improved because the inner concrete provides lateral support; the inner filling concrete is constrained by the steel tube and has better bearing capacity and deformation capacity than ordinary concrete; and the outer steel tube can be used as a template for the inner filling concrete, reducing the construction cost; therefore, the combination of steel tube concrete structure and steel structure will bring a series of beneficial effects.

[0003] However, the existing method of connecting steel tube concrete columns and steel tube columns is usually to insert the steel tube column into the concrete column, and the insertion depth is the height of a floor. This method is relatively cumbersome and difficult to construct.

[0004] In summary, how to solve the cumbersome problem of inserting steel tube columns into steel tube concrete columns during construction has become a difficult problem that needs to be solved urgently in the current field, because it is necessary to propose a steel tube concrete-steel tube vertical hybrid structure system. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a steel tube concrete-steel tube vertical hybrid structure system. The steel tube concrete-steel tube vertical hybrid structure system realizes the direct connection between steel tube columns and steel tube concrete columns through steel tube concrete column-steel tube column connectors, avoiding the cumbersome process of inserting the steel tube column into the steel tube concrete column for construction in the traditional method, greatly simplifying the construction process and improving construction efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a steel tube concrete-steel tube vertical hybrid structure system, including a plurality of steel tube concrete columns, a plurality of steel tube columns and a plurality of steel tube concrete column-steel tube column connectors, the steel tube concrete columns are all located at the lower part of the floor, the steel tube columns are all located at the upper part of the floor, and the steel tube columns and the steel tube concrete columns are fixedly connected by steel tube concrete column-steel tube column connectors.

[0007] The technical principles of the above scheme are as follows:

[0008] The direct connection between steel tube columns and steel tube concrete columns is achieved through steel tube concrete column-steel tube column connectors; at the same time, steel tubes have good bending resistance and stability, while concrete has high compressive strength; when the two are combined, the steel tube can form a rigid constraint on the concrete to prevent it from brittle failure, thereby improving the overall bearing capacity; during construction, the steel tube concrete column is located at the lower part of the floor, extending upward from the foundation, and is fixedly connected to the steel tube concrete column-steel tube column connector when reaching the high-rise. In this building structure, the lower columns are subjected to large axial forces and shear forces, and because the building function requires that the height of the first floor or the lower floors is greater than that of the upper floor, the cross-sectional area of ​​the lower steel tube concrete column needs to be increased during structural design to enhance its bearing capacity and rigidity.

[0009] The above scheme has the following beneficial effects:

[0010] 1. The steel tube concrete-steel tube vertical hybrid structure system of this scheme realizes the direct connection between steel tube columns and steel tube concrete columns through steel tube concrete column-steel tube column connectors, avoiding the cumbersome process of inserting steel tube columns into steel tube concrete columns in traditional methods, greatly simplifying the construction process and improving construction efficiency.

[0011] 2. This scheme achieves an optimal distribution of the structural bearing capacity by combining the advantages of steel tube concrete columns and steel tube columns. The steel tube concrete columns provide higher bearing capacity on the lower floors, while the steel tube columns maintain good flexibility and economy on the upper floors. The overall structure is more reasonable and efficient.

[0012] 3. This scheme ensures a stable connection between steel tube concrete columns and steel tube concrete columns by adopting steel tube concrete column-steel tube column connectors; this connection design not only transfers loads efficiently, but also can withstand complex stress conditions, thereby improving the overall safety and reliability of the structure.

[0013] 4. This scheme also has good seismic performance; the high strength and high ductility of steel tube concrete columns and the flexibility of steel tube columns work together on the structural system, making the overall structure more resistant to natural disasters such as earthquakes.

[0014] Furthermore, both the steel tube concrete column and the steel tube column are cylindrical structures, and the cross-sectional size of the steel tube concrete column is larger than that of the steel tube column.

[0015] Beneficial effects: The cylindrical structure has good stress-bearing performance and stability, and can more effectively resist horizontal loads and bending moments; at the same time, the cross-sectional size of the steel tube concrete column is larger than that of the steel tube column, ensuring that the different bearing capacity requirements of the structure in different floor sections are met.

[0016] Furthermore, a plurality of steel tube brackets are fixedly connected to the steel tube concrete columns.

[0017] Beneficial effects: By setting up steel tube supports, the overall stiffness and stability of the main steel tube concrete column are enhanced, the buckling problem caused by excessive slenderness ratio is avoided, and the overall bearing capacity and seismic performance of the structure are improved.

[0018] Furthermore, an I-beam is fixedly connected between two adjacent steel pipe columns, and the I-beam is fixedly connected to the steel pipe column, the steel pipe concrete column and the steel pipe bracket through a shear connector.

[0019] Beneficial effects: The transverse connection of I-beams enhances the collaborative working ability between steel pipe columns, improves the lateral stiffness and torsional stiffness of the structure, and enhances the overall stability and seismic performance of the structure.

[0020] Furthermore, the steel tube concrete column-steel tube column connector includes a chuck that is symmetrically arranged in an upper and lower manner, the upper chuck is fixedly connected to the bottom end of the steel tube column, the lower chuck is detachably connected to the top end of the steel tube concrete column, a plurality of protrusions are fixedly connected to the chuck, and a claw is fixedly connected to the side of the chuck close to the protrusion.

[0021] Beneficial effect: The design of the chuck, protrusion and claw arranged symmetrically up and down makes it possible for the steel pipe column and the steel pipe concrete column to be installed and docked by rotating the steel pipe column so that the claw on the upper chuck can be rotated and clamped on the protrusion on the lower chuck, thereby achieving a tight docking and fixation of the steel pipe column and the steel pipe concrete column, reducing the difficulty of construction. At the same time, the claw can also prevent the steel pipe column from moving horizontally.

[0022] Furthermore, the shear-resistant connector includes a plurality of fixed blocks and a plurality of steel nails. The fixed blocks are fixedly connected to the outer wall of the steel pipe column, screw holes are opened on the fixed blocks, and the inner bottom walls of the screw holes are fixedly connected with wedge-shaped clamps; one end of the steel nails is fixedly connected to the I-beam, and the end of the steel nail away from the I-beam is sleeved with bolts, the bolts and the steel nails are rotationally matched, the bolts and the screw holes are threadedly matched, and an oblique groove is opened at the end of the bolt away from the I-beam.

[0023] Beneficial effect: As the bolt continues to be screwed into the screw hole, the inclined groove can push the wedge-shaped clamp 12 to bend and deform toward the center and then tightly hold the steel nail, avoiding the steel nail from being pulled out due to the bending deformation of the I-beam, thereby realizing the transverse shear connection between the I-beam and the steel pipe column and the steel tube concrete column.

[0024] Furthermore, the top of the I-beam is fixedly connected with a reinforced concrete beam.

[0025] Beneficial effects: Reinforced concrete beams make the load transfer between floors more uniform and avoid stress concentration on each floor. Reinforced concrete beams, as the main load-bearing components, together with I-beams and steel pipe columns, form a stable floor structure system.

[0026] Furthermore, the bearing capacity formula of the steel tube concrete column-steel tube column connection is as follows:

[0027] N=φ×[As×fy+Ac×fc×(1+θ)] (1)

[0028] in, N is the bearing capacity of the steel tube concrete column; h is the length of the steel tube column, s is the minimum cross-sectional area of ​​the steel tube concrete column-steel tube column connector; As is the cross-sectional area of ​​the steel tube column; fy is the yield strength of the steel tube column; Ac is the cross-sectional area of ​​the concrete in the steel tube concrete column; fc is the compressive strength of the concrete in the steel tube concrete column; θ is the hoop index, θ=(Ac×fc) / (As×fy), where As is the cross-sectional area of ​​the steel tube column; fy is the yield strength of the steel tube column; Ac is the cross-sectional area of ​​the concrete in the steel tube concrete column, and fc is the compressive strength of the concrete in the steel tube concrete column;

[0029] The calculation formula of shear bearing capacity of shear connector is as follows:

[0030]

[0031] Wherein, A is the cross-sectional area of ​​the steel nail, d is the diameter of the steel nail, fv is the yield strength of the material of the steel nail 11, and Fv is the shear bearing capacity of the shear connector.

[0032] Beneficial effects: By providing the bearing capacity formula of steel tube concrete column-steel tube column connector and the shear bearing capacity calculation formula of shear connector, the performance of the structure under various loads can be calculated more accurately, thereby ensuring the safety and stability of the structure; the application of the bearing capacity formula helps to optimize the use of steel tube and concrete materials. Through precise calculation, it can be determined that the minimum amount of material is used while meeting the bearing capacity requirements, thereby reducing costs and reducing resource waste; the introduction of the hoop index θ takes into account the constraint effect of the steel tube on the core concrete. This constraint effect can significantly improve the compressive strength and ductility of the concrete, thereby enhancing the bearing capacity and seismic performance of the entire structure.

[0033] Furthermore, the processing height of the I-beam is the cross-sectional height of the reinforced concrete beam minus the thickness of the steel bar protective layer of the reinforced concrete beam.

[0034] Beneficial effect: By accurately calculating the processing height of the I-beam, a close fit between it and the reinforced concrete beam is ensured, avoiding construction difficulties and quality problems caused by height mismatch.

[0035] Furthermore, a plurality of reinforcing ribs are fixedly connected to the inner wall of the connection portion between the steel tube column and the steel tube concrete column, and the reinforcing ribs are arranged axially and circumferentially inside the steel tube column and the steel tube concrete column.

[0036] Beneficial effects: The arrangement of reinforcing ribs enhances the strength and rigidity of the connection part, reduces the vertical shear force of the connection part between the steel tube column and the steel tube concrete column, and improves the overall stability and bearing capacity of the structure.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is an axonometric diagram of an embodiment of the steel tube concrete-steel tube vertical hybrid structure system of the present invention.

[0039] Figure 2 It is an axonometric view of a steel tube concrete column-steel tube column connector of an embodiment of a steel tube concrete-steel tube vertical hybrid structure system of the present invention.

[0040] Figure 3 It is a front cross-sectional view of a shear connector of an embodiment of a steel tube concrete-steel tube vertical hybrid structure system of the present invention.

[0041] The figure marks in the drawings of the specification include: 1. steel tube concrete column; 2. steel tube column; 3. steel tube bracket; 4. I-beam; 5. reinforced concrete beam; 6. chuck; 7. claw; 8. bump; 9. bolt; 10. fixing block; 11. steel nail; 12. wedge clamp. DETAILED DESCRIPTION

[0042] The following is further described in detail through specific implementation methods:

[0043] Embodiment 1:

[0044] like Figure 1 Shown is a steel tube concrete-steel tube vertical hybrid structure system, including a plurality of steel tube concrete columns 1, steel tube columns 2 and steel tube concrete column-steel tube column connectors.

[0045] The steel tube concrete columns 1 are all located at the lower part of the floor, and the steel tube columns 2 are all located at the upper part of the floor. The steel tube columns 2 and the steel tube concrete columns 1 are fixedly connected by steel tube concrete column-steel tube column connectors.

[0046] The steel tube concrete column 1 and the steel tube column 2 are both cylindrical structures, and the cross-sectional dimension of the steel tube concrete column 1 is larger than that of the steel tube column 2; a plurality of steel tube brackets 3 are welded and fixed on the steel tube concrete column 1.

[0047] I-beams 4 are fixedly connected between two adjacent steel tube columns 2 and two adjacent steel tube concrete columns 1, and the I-beams 4 are fixedly connected to the steel tube columns 2, the steel tube concrete columns 1 and the steel tube supports 3 through shear connectors; reinforced concrete beams 5 are cast on the tops of the I-beams 4; the processing height of the I-beams 4 is the cross-sectional height of the reinforced concrete beams 5 minus the thickness of the steel bar protective layer of the reinforced concrete beams 5.

[0048] The bearing capacity formula of steel tube concrete column-steel tube column connection is as follows:

[0049] N=φ×[As×fy+Ac×fc×(1+θ)] (1)

[0050] in, N is the bearing capacity of the steel tube concrete column-steel tube column connection; h is the length of the steel tube column 2, s is the minimum cross-sectional area of ​​the steel tube concrete column-steel tube column connection; As is the cross-sectional area of ​​the steel tube column 2; fy is the yield strength of the steel tube column 2; Ac is the cross-sectional area of ​​the concrete in the steel tube concrete column 1; fc is the compressive strength of the concrete in the steel tube concrete column 1; θ is the hoop index, θ = (Ac×fc) / (As×fy), where As is the cross-sectional area of ​​the steel tube column 2; fy is the yield strength of the steel tube column 2; Ac is the cross-sectional area of ​​the concrete in the steel tube concrete column 1, and fc is the compressive strength of the concrete in the steel tube concrete column 1.

[0051] The calculation formula of shear bearing capacity of shear connector is as follows:

[0052]

[0053] Wherein, A is the cross-sectional area of ​​the steel nail 11, d is the diameter of the steel nail 11, fv is the yield strength of the material of the steel nail 11, and Fv is the shear bearing capacity of the shear connector.

[0054] The specific implementation process is as follows:

[0055] According to the building needs and structural requirements, the size, quantity and layout of steel tube concrete columns 1 and 2 are designed, and the specific configuration of the upper and lower structures of the floors is determined. Steel tubes, concrete, I-beams 4, shear connectors, reinforcement bars and other materials that meet the design requirements are purchased and quality inspections are carried out.

[0056] According to the design requirements, the steel tube is cut to the specified length and filled with concrete to form a steel tube concrete column 1. Ensure that the concrete is fully vibrated and compacted to reach the designed strength.

[0057] The steel tube support 3 is fixedly installed on the steel tube concrete column 1 according to the design requirements to enhance its stability and bearing capacity.

[0058] The fabricated steel tube concrete column 1 is hoisted to the designated position at the lower part of the floor, and is precisely aligned and fixed. According to the design requirements, the steel tube is cut to the designated length and necessary anti-corrosion treatment is performed.

[0059] The steel tube column 2 is hoisted to the designated position on the upper part of the floor, and connected to the steel tube concrete column 1 through the steel tube concrete column-steel tube column connector. An I-beam 4 is installed between two adjacent steel tube columns 2 and two adjacent steel tube concrete columns 1 to enhance the stability and rigidity of the overall structure.

[0060] Set up the formwork on the top of I-beam 4 to ensure that the size and position of the formwork meet the design requirements.

[0061] Tie the steel bars in the formwork to form the skeleton of the reinforced concrete beam 5. Pour concrete into the formwork and fully vibrate it to make it dense. Remove the formwork after the concrete reaches the designed strength. Install reinforcing ribs on the inner wall of the connection between the steel tube column 2 and the steel tube concrete column 1 according to the design requirements. The reinforcing ribs are arranged axially and circumferentially to enhance the strength and stability of the connection. Perform quality inspection on the entire steel tube concrete-steel tube vertical hybrid structure system, including inspections on size, position, connection strength, etc.

[0062] Embodiment 2:

[0063] like Figure 2 As shown, the difference from the above embodiment is that the steel tube concrete column-steel tube column connecting piece includes a chuck 6 which is symmetrically arranged in the upper and lower parts, the upper chuck 6 and the bottom end of the steel tube column 2 are welded and fixed, the lower chuck 6 and the top end of the steel tube concrete column 1 are detachably connected, and a plurality of protrusions 8 are integrally formed on the chuck 6, and a claw 7 is integrally formed on the side of the chuck 6 close to the protrusion 8.

[0064] The specific implementation process is as follows: the design of the chuck 6, the protrusion 8 and the claw 7 symmetrically arranged above and below allows the steel pipe column 2 and the steel pipe concrete column 1 to be installed and docked by rotating the steel pipe column 2 so that the claw 7 on the upper chuck 6 can be rotated and clamped to the protrusion 8 on the lower chuck 6, thereby achieving a tight docking and fixation of the steel pipe column 2 and the steel pipe concrete column 1, reducing the construction difficulty. At the same time, the claw 7 can also prevent the steel pipe column 2 from moving laterally.

[0065] Embodiment 3:

[0066] like Figure 3As shown, the difference from the above embodiment is that the shear connector includes a plurality of fixing blocks 10 and a plurality of steel nails 11. The fixing blocks 10 are welded and fixed to the outer wall of the steel pipe column 2. Screw holes are opened on the fixing blocks 10. Wedge-shaped clamps 12 are welded and fixed to the bottom walls of the screw holes. One end of the steel nails 11 is welded and fixed to the I-beam 4. The end of the steel nails 11 away from the I-beam 4 is sleeved with bolts 9. The bolts 9 and the steel nails 11 are rotatably matched. The bolts 9 and the screw holes are threadedly matched. The end of the bolts 9 away from the I-beam 4 is provided with an oblique groove.

[0067] The specific implementation process is as follows: fix the fixing block 10 on the outer wall of the steel pipe column 2 and the steel tube concrete column 1, open a screw hole on the fixing block 10, install a wedge clamp 12, and then, weld the steel nail 11 to the I-beam 4, align the end of the steel nail 11 away from the I-beam 4 with the screw hole and insert it into the wedge clamp 12 inside the screw hole, use a wrench to screw the bolt 9 into the screw hole on the fixing block 10, when the inclined groove on the bolt 9 contacts the wedge clamp 12, the wedge surface of the wedge clamp 12 and the inclined groove slide in cooperation, as the bolt 9 continues to be screwed into the screw hole, the inclined groove can push the wedge clamp 12 to bend and deform toward the center and then tightly hold the steel nail 11, avoid the steel nail 11 being pulled out due to the bending deformation of the I-beam 4, and realize the transverse shear connection between the I-beam 4 and the steel pipe column 2 and the steel tube concrete column 1, when the bolt 9 is rotated to the designed torque size, the I-beam 4 is then welded and fixed to the steel pipe column 2 and the steel tube concrete column 1.

[0068] Embodiment 4:

[0069] The difference from the above embodiment is that a plurality of reinforcing ribs are fixedly connected to the inner wall of the connection portion between the steel tube column 2 and the steel tube concrete column 1 , and the reinforcing ribs are arranged axially and circumferentially inside the steel tube column 2 and the steel tube concrete column 1 .

[0070] The specific implementation process is as follows: the arrangement of the reinforcing ribs enhances the strength and rigidity of the connection part, reduces the vertical shear force of the connection part between the steel tube column 2 and the steel tube concrete column 1, and improves the overall stability and bearing capacity of the structure.

[0071] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A steel tube concrete-steel tube vertical hybrid structure system, characterized in that: The invention comprises a plurality of steel tube concrete columns (1), a plurality of steel tube columns (2) and a plurality of steel tube concrete column-steel tube column connecting pieces. The steel tube concrete columns (1) are all located at the lower part of the floor, the steel tube columns (2) are all located at the upper part of the floor, and the steel tube columns (2) and the steel tube concrete columns (1) are fixedly connected by the steel tube concrete column-steel tube column connecting pieces.

2. The steel tube concrete-steel tube vertical hybrid structure system according to claim 1 is characterized in that: The steel tube concrete column (1) and the steel tube column (2) are both cylindrical structures, and the cross-sectional dimensions of the steel tube concrete column (1) are larger than the cross-sectional dimensions of the steel tube column (2).

3. The steel tube concrete-steel tube vertical hybrid structure system according to claim 2 is characterized in that: A plurality of steel tube brackets (3) are fixedly connected to the steel tube concrete column (1).

4. The steel tube concrete-steel tube vertical hybrid structure system according to claim 3 is characterized in that: An I-beam (4) is fixedly connected between two adjacent steel tube columns (2) and two adjacent steel tube concrete columns (1), and the I-beam (4) is fixedly connected to the steel tube column (2), the steel tube concrete column (1) and the steel tube support (3) via a shear connector.

5. The steel tube concrete-steel tube vertical hybrid structure system according to claim 4 is characterized in that: The steel tube concrete column-steel tube column connector comprises a chuck (6) symmetrically arranged in an upper and lower manner, wherein the upper chuck (6) is fixedly connected to the bottom end of the steel tube column (2), and the lower chuck (6) is detachably connected to the top end of the steel tube concrete column (1), and a plurality of protrusions (8) are fixedly connected to the chuck (6), and a claw (7) is fixedly connected to one side of the chuck (6) close to the protrusion (8).

6. The steel tube concrete-steel tube vertical hybrid structure system according to claim 5, characterized in that: The shear-resistant connector comprises a plurality of fixing blocks (10) and a plurality of steel nails (11); the fixing blocks (10) are fixedly connected to the outer wall of the steel pipe column (2); a screw hole is formed on the fixing blocks (10); a wedge-shaped clamp (12) is fixedly connected to the inner bottom wall of the screw hole; one end of the steel nail (11) is fixedly connected to the I-beam (4); a bolt (9) is sleeved on the end of the steel nail (11) away from the I-beam (4); the bolt (9) and the steel nail (11) are rotationally matched; the bolt (9) and the screw hole are threadedly matched; and an oblique groove is formed on the end of the bolt (9) away from the I-beam (4).

7. The steel tube concrete-steel tube vertical hybrid structure system according to claim 6, characterized in that: A reinforced concrete beam (5) is cast on the top of the I-beam (4).

8. The steel tube concrete-steel tube vertical hybrid structure system according to claim 7, characterized in that: The bearing capacity formula of steel tube concrete column-steel tube column connection is as follows: N=φ×[As×fy+Ac×fc×(1+θ)](1) in, N is the bearing capacity of the steel tube concrete column-steel tube column connection; h is the length of the steel tube column (2), s is the minimum cross-sectional area of ​​the steel tube concrete column-steel tube column connection; As is the cross-sectional area of ​​the steel tube column (2); fy is the yield strength of the steel tube column (2); Ac is the cross-sectional area of ​​the concrete in the steel tube concrete column (1); fc is the compressive strength of the concrete in the steel tube concrete column (1); θ is the hoop index, θ = (Ac×fc) / (As×fy), where As is the cross-sectional area of ​​the steel tube column (2); fy is the yield strength of the steel tube column (2); Ac is the cross-sectional area of ​​the concrete in the steel tube concrete column (1), fc is the compressive strength of the concrete in the steel tube concrete column (1); The calculation formula of shear bearing capacity of shear connector is as follows: Wherein, A is the cross-sectional area of ​​the steel nail (11), d is the diameter of the steel nail (11), fv is the yield strength of the material of the steel nail 11, and Fv is the shear bearing capacity of the shear connector.

9. The steel tube concrete-steel tube vertical hybrid structure system according to claim 8, characterized in that: The processing height of the I-beam (4) is the cross-sectional height of the reinforced concrete beam (5) minus the thickness of the steel bar protective layer of the reinforced concrete beam (5).

10. The steel tube concrete-steel tube vertical hybrid structure system according to claim 9, characterized in that: A plurality of reinforcing ribs are fixedly connected to the inner wall of the connection portion between the steel tube column (2) and the steel tube concrete column (1), and the reinforcing ribs are arranged axially and circumferentially inside the steel tube column (2) and the steel tube concrete column (1).

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