A steel-concrete composite slab-column structure

Abstract

The present invention discloses a steel-concrete composite slab-column structure, comprising a reinforced concrete slab and a reinforced concrete column, wherein a steel frame support of the reinforced concrete slab is enclosed by a joist at the top of the column of the reinforced concrete column; the steel frame support has a hoop enclosing the top of the column and a joist connected to the hoop and extending outward along the bottom layer of the reinforced concrete slab; the joist is connected to a fastener embedded in the reinforced concrete slab. Compared with the traditional reinforced concrete flat plate structure with column caps, the present application effectively utilizes the high-strength performance of steel; overcomes the problem that the rolling door cannot be installed to the top due to the obstruction of the traditional column cap, and a avoidance groove is left between the joists to provide space for the installation of the rolling door so that it can be installed to the top.

Description

Technical Field

[0001] The invention belongs to the field of building structures, and in particular relates to a steel-concrete composite slab-column structure. Background Art

[0002] Reinforced concrete slab-column structure, commonly known as beamless floor structure, refers to a structural system in which the structural skeleton is composed of reinforced concrete slabs and reinforced concrete columns connected by slab-column nodes. The slabs can be designed into concrete flat plates, ribbed concrete slabs, hollow sandwich concrete slabs, and two-way dense-ribbed lattice concrete slabs. They can be designed into ordinary reinforced concrete slabs, partially prestressed concrete slabs, and steel fiber concrete slabs according to different reinforcement. The columns are generally reinforced concrete rectangular columns or circular columns.

[0003] The column cap is set on the top of the column of the concrete slab-column structure to increase the column-to-slab support area. When the floor load is large, it can improve the load-bearing capacity, rigidity and shear resistance of the slab. In the traditional concrete slab structure with column cap, the column cap has a large cross-sectional size and needs to be cast on site. Summary of the invention

[0004] The present invention provides a steel-concrete composite slab-column structure, which uses a composite steel frame support to replace the traditional cast-in-place reinforced concrete column cap. The steel frame support can be prefabricated in a factory and directly installed on site, which is convenient for construction. At the same time, the high strength of steel is used to effectively reduce the size of the column cap.

[0005] The specific technical solutions adopted are as follows:

[0006] A steel-concrete composite slab-column structure, comprising a reinforced concrete slab and a reinforced concrete column, wherein a steel frame support for supporting the reinforced concrete slab is arranged at the top of the reinforced concrete column;

[0007] The steel frame support is composed of a plurality of joists and closed hoops, the closed hoops are arranged around the outer periphery of the reinforced concrete column, and the joists extend outward;

[0008] The steel frame support is supported on the bottom surface of the reinforced concrete slab, and bolts are respectively arranged on the top surface and the inner side surface thereof to be connected with the reinforced concrete slab and the column.

[0009] The present application installs steel frame supports in the node area of ​​the reinforced concrete slab-column structure to replace the traditional cast-in-place reinforced concrete column caps, fully utilizing the high-strength performance of steel and reducing the cross-sectional size of the column caps; through the enclosing effect of the closed hoop of the steel frame support, the column head concrete is fully constrained to effectively improve the bearing capacity of the node area; the support beam extends outward from the hoop, and the size can be adjusted according to the bearing requirements. At the same time, different forms can be selected in combination with the architectural shape requirements.

[0010] In addition, in the traditional slab-column structure, due to the influence of the cast-in-place column cap on the top of the column, the fire shutter between the columns set up for fire protection requirements cannot be installed on the top of the reinforced concrete column, resulting in insufficient net height, which significantly affects the functional layout of the building. With the technical solution of the present invention, sufficient space can be reserved between the steel frame support beams to accommodate the bracket and track of the rolling shutter door, so that the rolling shutter door can be installed on the bottom of the slab, effectively solving the problems existing in the traditional slab-column structure.

[0011] Preferably, corresponding to the rectangular column, the steel frame support is in a tic-tac-toe shape. That is, the closed collar is rectangular, and the outwardly extending joist in one direction can be connected to one side of the closed collar to form an integral component. In the tic-tac-toe steel frame support, the space between the two joists on the same side can be used to install a rolling door. In addition, corresponding to the circular column, the closed collar can be made into a ring shape, and the joist is radially welded to the periphery of the collar.

[0012] Preferably, the inner wall of the closed hoop is overlap-welded with the longitudinal reinforcement of the column in the reinforced concrete column, the inner wall of the closed hoop is pre-deployed with bolts to connect with the reinforced concrete column, and the top surface of the closed hoop and the supporting beam is pre-deployed with bolts to connect with the reinforced concrete slab. In this way, the shear force and bending moment transmitted to the reinforced concrete column by the slab can be effectively transmitted, thereby ensuring the overall bearing performance of the steel frame support, column and slab.

[0013] Preferably, the top of the column longitudinal reinforcement extends into the reinforced concrete slab, and three column stirrups are provided within the thickness of the slab.

[0014] Preferably, the steel frame support closed hoop is welded from rectangular steel pipes, and the support beam can be made of rectangular steel pipes, H-shaped steel, T-shaped steel and other cross-sections, which are welded with the closed hoop to form an integral steel frame support.

[0015] In order to fully meet the modeling requirements of the building space, preferably, the bottom edge of the support beam is in the shape of an oblique line, a broken line or a curved arc.

[0016] Preferably, the bolts are welded to the steel frame supports and prefabricated in a factory, wherein the cross-section of the steel frame supports and the number of bolts to be arranged should be determined according to the force requirements.

[0017] Compared with the traditional reinforced concrete flat structure with column caps, the structure of the present application effectively utilizes the high-strength performance of steel and reduces the cross-sectional size of the column caps; the use of combined steel frame supports is conducive to factory prefabrication and on-site installation, reducing the on-site column cap construction process; and overcomes the problem that the fireproof roller shutter cannot be installed to the top due to the obstruction of traditional column caps.

[0018] Compared with the cast-in-place column caps in the traditional reinforced concrete slab-column structure, the steel frame supports of the present invention are prefabricated and installed, which makes the construction more convenient and also complies with the prefabricated building industry policy advocated by the state.

[0019] Compared with a reinforced concrete flat plate structure without column caps, the structure of the present application can bear a greater load and has wider applicability to large-span slab-column structures that generally require column caps.

[0020] Compared with the slab-column structure with steel sections embedded in concrete slabs and columns, the structure of the present application can, on the one hand, effectively reduce the cross-sectional dimensions of the slabs and columns, and on the other hand, reduce the difficulty of on-site construction, making it easier to ensure the construction quality of the node area; the node area adopts a combined steel frame support to form a closed sleeve for the column head area, which fully constrains the column head concrete, and at the same time combines the bolt connection and the welding connection between the column longitudinal reinforcement and the sleeve to greatly improve the bearing capacity of the node area and enhance the safe bearing performance of the slab-column structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A bottom view of the steel-concrete composite slab-column structure in this application;

[0022] Figure 2 It is a vertical elevation view of the steel-concrete composite slab-column structure in this application;

[0023] Figure 3 It is a vertical cross-sectional view of the steel-concrete composite slab-column structure in this application. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the embodiments and the accompanying drawings, but the present invention is not limited thereto.

[0025] like Figure 1-3 The steel-concrete composite slab-column structure shown includes a reinforced concrete slab 101 and a reinforced concrete column 102 , wherein a steel frame support 103 for supporting the reinforced concrete slab 101 is provided at the top of the reinforced concrete column 102 .

[0026] The steel frame support 103 is composed of a closed collar 104 enclosing the top of the column and a joist 105 connected to the closed collar 104 and extending outward along the bottom surface of the reinforced concrete slab 101. The closed collar 104 is welded from a rectangular steel pipe, and the outwardly extending joist 105 is arranged along the periphery of the collar, and its number, cross-section and length can be determined according to design requirements. The steel frame support 103 encloses the column head area, fully constrains the column head concrete, fully utilizes the high strength performance of steel, and reduces the cross-sectional size of the column cap; the joist 105 connects the periphery of the closed collar 104 to form a support for the reinforced concrete slab 101, which can meet the demand of bearing a larger load.

[0027] The steel frame support 103 in this embodiment is in a well-shaped shape. In the well-shaped steel frame support, the distance between the two support beams on the same side is a avoidance groove 100, and the fireproof roller shutter is installed in the groove. Figure 1The closed collar 104 is rectangular, and the joist 105 in one direction can be connected to one side of the closed collar 104 to form an integral component. In another embodiment, the collar 104 can also be designed as a circular ring, corresponding to a circular reinforced concrete column, and the joist 105 is radially welded to the outer periphery of the collar 104.

[0028] The inner wall of the closed hoop 104 and the column longitudinal reinforcement 107 in the reinforced concrete column 102 are overlap-welded, and the weld is a double-sided fillet weld with a length of 5d+10mm (d is the diameter of the steel bar); the top of the column longitudinal reinforcement 107 extends into the reinforced concrete slab 101, and three column stirrups 108 are arranged within the slab thickness; at the same time, each surface of the inner wall of the closed hoop 104 is pre-set with studs 109 to connect with the reinforced concrete column 102, and the top surfaces of the closed hoop 104 and the supporting beam 105 are pre-arranged with studs 106 to connect with the reinforced concrete slab 101; in this way, the shear force and bending moment transmitted to the reinforced concrete column by the slab can be effectively transmitted, thereby ensuring the overall bearing performance of the steel frame support, the column and the slab.

[0029] like Figure 3 As shown, within the height range where the steel frame support 103 is located, the inner column stirrups of the reinforced concrete column 102 may not be provided, so as to facilitate the on-site installation of the steel frame support 103 with the pre-arranged studs 109 .

[0030] In order to fully meet the modeling requirements of the building space, the bottom edge of the support beam 105 can be in the shape of an oblique line, a broken line or a curved arc.

[0031] The cross-section, size and number of bolts of each component of the steel frame support 103 can be designed and determined according to the force requirements or structural requirements.

[0032] The above description is only an example of a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel-concrete composite slab-column structure, comprising a reinforced concrete slab and a reinforced concrete column, characterized in that: A steel frame support for supporting the reinforced concrete slab is provided at the top of the reinforced concrete column; The steel frame support is composed of a plurality of joists and closed hoops, the closed hoops are arranged around the outer periphery of the reinforced concrete column, and the joists extend outward; The steel frame support is supported on the bottom surface of the reinforced concrete slab, and the top surface and inner side surface thereof are respectively provided with bolts to connect with the reinforced concrete slab and the column; The inner wall of the closed sleeve is overlap-welded with the longitudinal reinforcement of the reinforced concrete column; Each surface of the inner wall of the closed sleeve is provided with studs to connect with the reinforced concrete column; The top of the reinforced concrete column longitudinal reinforcement extends into the reinforced concrete slab, and three column stirrups are provided within the slab thickness; The steel frame supports are in a tic-tac-toe cross shape or a circular radial shape, corresponding to the rectangular column and the circular column respectively.

2. The steel-concrete composite slab-column structure according to claim 1, characterized in that: The steel frame support closed hoop is welded from rectangular steel pipes, and the support beam can be made of rectangular steel pipes, H-shaped steel, T-shaped steel and other cross-sections, which are welded with the closed hoop to form an integral steel frame support.

3. The steel-concrete composite slab-column structure according to claim 1, characterized in that: The bottom edge of the supporting beam is in the shape of an oblique line, a broken line or a curved arc.

4. The steel-concrete composite slab-column structure according to claim 1, characterized in that: The bolts and the steel frame supports are connected by welding.

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