CN112854482A

CN112854482A - Nested formula steel column-concrete column connection structure

Info

Publication number: CN112854482A
Application number: CN202110282063.0A
Authority: CN
Inventors: 祝文畏; 杨学林; 王立虎; 朱晟熙; 王宽; 岳燕玲
Original assignee: Zhejiang Province Institute of Architectural Design and Research
Current assignee: Zhejiang Province Institute of Architectural Design and Research
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-05-28

Abstract

The invention discloses a nested steel column-concrete column connecting structure which comprises a steel column and a concrete column which are connected up and down, wherein the steel column comprises an external steel tube, and concrete and longitudinal ribs which are poured in the steel tube; the periphery of the interior of the steel tube is fixedly provided with studs, and the longitudinal ribs penetrate through the concrete column at the lower part and the steel column at the middle part; the concrete column also comprises a stirrup surrounding the longitudinal rib, and the concrete in the steel column and the concrete column are poured simultaneously; and defining the outer diameter of the steel column as D1, and the diameter of the concrete column as D2, wherein D2 is more than or equal to D1 and less than D1+200 mm. The structure of the invention skillfully utilizes the extrusion of the concrete core column and the steel column to transfer the bending moment. Meanwhile, a bearing device is arranged in the steel pipe, and the stiffening ribs and the column foot plates are used for transferring the axial force in an inverted mode. The structure has novel and unique form, simple structure and definite stress.

Description

Nested formula steel column-concrete column connection structure

Technical Field

The invention relates to the technical field of steel structures, in particular to a nested steel column-concrete column connecting structure.

Background

Steel structure buildings are widely used in industrial and civil buildings because of their advantages of light dead weight, high strength and quick construction. In order to form a reasonable force transmission system by the overground part steel structure and the basement reinforced concrete structure, the specification of the high-steel specification 3.4.2: the steel frame column should extend at least to a layer below the calculation embedding end. As shown in fig. 1-2, the steel column needs to have an enlarged cross section when extending downward, and the floor beam steel bars and the steel bars will collide with each other. At this moment, according to the standard requirement, the extension part of the steel frame column needs to be wrapped by 200mm of concrete, namely, the single side of the lower concrete column needs to be expanded by 200mm, so that the cross section of the concrete column of the basement is increased, and the space and parking space arrangement of the basement are influenced. When the steel column embedded floor is the floor of the ground structure, the appearance, the using effect and the like of the building are influenced by the increase of the section of the concrete column. In addition, the beam reinforcing bars of the steel column embedded layer are often very large, the beam reinforcing bars conflict with the steel bars in the column, and if the existing embedded type steel column base is adopted, complicated nodes are required to be designed to avoid the influence of the steel bars inserted downwards on the beam reinforcing bars, as shown in fig. 2, the steel bars in the beam are broken by the steel bars in the lower column, and sleeves or steel brackets are required to be welded on the steel bars and the stiffening plates are required to be connected with the steel bars in the beam. The method not only uses a large amount of steel, but also causes great difficulty to construction.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a nested steel column-concrete column connecting structure which skillfully utilizes the extrusion of a concrete core column and a steel column and the bonding between the inner wall of a steel pipe and concrete to transfer bending moment. Meanwhile, a bearing device is arranged in the steel pipe, and the stiffening ribs and the column foot plates are used for transferring the axial force in an inverted mode. The structure has novel and unique form, simple structure and definite stress.

The purpose of the invention is realized by the following technical scheme:

a nested steel column-concrete column connecting structure comprises a steel column and a concrete column which are connected up and down, wherein the steel column comprises an external steel tube, and concrete and longitudinal ribs which are poured in the steel tube; the periphery of the interior of the steel tube is fixedly provided with studs, and the longitudinal ribs penetrate through the concrete column at the lower part and the steel column at the middle part; the concrete column also comprises a stirrup surrounding the longitudinal rib, and the concrete in the steel column and the concrete column are poured simultaneously;

and defining the outer diameter of the steel column as D1, and the diameter of the concrete column as D2, wherein D2 is more than or equal to D1 and less than D1+200 mm.

Further, the nested steel column-concrete column connecting structure further comprises a supporting device connected to the upper portion of the steel column.

Furthermore, the supporting device comprises a supporting plate and a stiffening rib fixed on the supporting plate, and the periphery of the supporting plate is fixed on the steel pipe.

Further, an annular plate is arranged between the steel column and the concrete column.

Further, the annular plate is made of a flexible material.

Furthermore, the middle part of the bearing plate is provided with a concrete pouring hole, and the bearing plate is also provided with an exhaust hole.

Furthermore, the bearing plate is provided with a plurality of blocks; the stiffening ribs are multiple and are uniformly distributed along the circumferential direction.

The invention has the following beneficial effects:

1. the invention has definite stress, the axial force is transmitted by utilizing the supporting device arranged in the steel pipe, and the bending moment is transmitted by utilizing the extrusion of the concrete core column and the steel column;

2. when the invention is adopted, the section of the lower concrete column does not need to be enlarged strictly according to the standard, and the lower structure can have larger space.

3. The invention can avoid the influence of the inserted steel ribs on the beam steel bars, simplify the design and construction of the reinforced concrete beam column joint and greatly reduce the section steel consumption of the embedded steel ribs.

Drawings

FIG. 1 is a schematic top view of a prior art steel column-concrete conversion node;

FIG. 2 is a schematic cross-sectional view of a prior art steel column-concrete conversion node;

fig. 3 is a schematic view of the nested steel column-concrete column connection structure of the present invention.

Fig. 4 is a sectional view taken in the direction of 1-1 in fig. 1.

Fig. 5 is a sectional view taken in the direction 2-2 in fig. 1.

FIG. 6 is a schematic representation of another form of the invention.

Fig. 7 is a schematic diagram of a nesting structure when the diameter of the concrete column is slightly larger than that of the steel column.

In the figure, concrete column 1, steel column 2, supporting device 3, floor 4, frame beam 5, annular plate 6, beam longitudinal rib 7, column longitudinal rib 11, stirrup 12, steel pipe 21, stud 22, supporting plate 31, stiffening rib 32, pouring hole 311 and exhaust hole 312.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the present invention will become more apparent, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

As shown in fig. 3, the nested steel column-concrete column connection structure of the present invention comprises an upper supporting device 3, a middle steel column 2 and a lower concrete column 1. The steel column 2 comprises an external steel pipe 21, concrete poured inside the steel pipe and a column longitudinal rib 11; the studs 22 are welded around the inside of the steel tube 21, and the column longitudinal rib 11 penetrates through the concrete column 1 at the lower part and the steel column 2 at the middle part; the lower concrete column 1 also comprises stirrups 12 surrounding the longitudinal bars 11 of the column, and the concrete inside the steel column 2 in the middle is poured simultaneously with the lower concrete column 1. The upper supporting device 3 includes a supporting plate 31 and a stiffening rib 32 located on the supporting plate 31, the periphery of the supporting plate 31 is fixed on the inner wall of the steel pipe 21, and the stiffening rib 32 is welded on the upper side of the supporting plate 31.

The number and length of the lower concrete columns 1 extending into the steel columns can be determined by calculation. The section of the steel column 2 can be in various shapes such as a circle, a square rectangle or a polygon, and different section shapes can be selected to meet the requirements of different occasions.

The supporting device 3 is not essential and only needs to be arranged when the axle forces are large. The shape of the bearing plate 31 is matched with that of the steel column 2, and the pouring hole 311 in the center can be designed into various shapes such as a rectangle or a polygon according to different requirements. When the bearing capacity is insufficient, the bearing plate 31 can be a plurality of blocks, the specific number is based on the calculation result, and the position of the bearing plate can be adjusted. The support plate 31 is provided with a plurality of exhaust holes 312. The plurality of stiffeners 32 are uniformly distributed in the circumferential direction. As shown in fig. 4, which is a section 1-1 in fig. 3, there are 4 exhaust holes 312 and four stiffening ribs 32. Fig. 5 is a sectional view taken along the direction 2-2 in fig. 3, and the pegs 22 are uniformly welded around the steel pipe 21.

And defining the outer diameter of the steel column as D1, and the diameter of the concrete column as D2, wherein D2 is more than or equal to D1 and less than D1+200 mm. Namely, the nested structure of the steel column and the concrete column is provided, the concrete column at the lower part can be directly made to be equal to the steel column, or the diameter of the concrete column is slightly larger than the outer diameter of the steel column according to the actual requirement, and the concrete with the diameter of 200mm does not need to be coated according to the standard specification requirement. As shown in fig. 6, in order to further absorb the compressive transmission bending moment between the steel column 2 and the concrete column 1, a layer of annular plate 6 may be further provided between the middle steel column 2 and the lower concrete column 1. The annular plate 6 can be made of either a rigid or a flexible material. Preferably, the annular plate 8 is made of a flexible material.

Fig. 7 is a schematic diagram of when the diameter of the concrete column 1 is slightly larger than the outer diameter of the steel column, at this time, construction can be performed respectively due to different upper and lower diameters, and then concrete is uniformly poured after the vertical ribs inside the concrete column 1 and the vertical ribs inside the steel column 2 are bent and connected at the floor slab joint.

The nested steel column-concrete column connecting structure is suitable for floors of underground structures, and reduces the cross section of concrete columns of a basement, so that the space of the basement is enlarged, and the arrangement of parking places is not influenced. It is also applicable to the above-ground structure floors, as shown in fig. 3, and concrete columns penetrate the floor slab 4 and the frame beams 5, thereby reducing the influence on the appearance and the use effect of the building.

The steel tube 21 of the nested steel column-concrete column connection structure needs to be finished in a steel structure factory, and in the specific construction process, the whole steel tube 21 is firstly hoisted and positioned, and then integral casting is carried out through the casting hole 311.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.

Claims

1. A nested steel column-concrete column connecting structure is characterized by comprising a steel column and a concrete column which are connected up and down, wherein the steel column comprises an external steel tube, and concrete and longitudinal ribs which are poured in the steel tube; the periphery of the interior of the steel tube is fixedly provided with studs, and the longitudinal ribs penetrate through the concrete column at the lower part and the steel column at the middle part; the concrete column further comprises a stirrup surrounding the longitudinal rib, and concrete inside the steel column and the concrete column are poured simultaneously.

2. The nested steel column-concrete column connection structure of claim 1, further comprising a support device attached to an upper portion of the steel column.

3. The nested steel column-concrete column connection structure as recited in claim 2, wherein the support means comprises a support plate and stiffening ribs fixed to the support plate, the support plate being fixed around the steel tubes.

4. The nested steel column-concrete column connection structure of claim 1, wherein an annular plate is disposed between the steel column and the concrete column.

5. The nested steel column-concrete column connection structure of claim 4, wherein the annular plates are made of a flexible material.

6. The nested steel column-concrete column connection structure of claim 3, wherein a concrete pouring hole is formed in the middle of the support plate, and an exhaust hole is formed in the support plate.

7. The nested steel column-concrete column connection structure of claim 3, wherein the support plate is multi-piece; the stiffening ribs are multiple and are uniformly distributed along the circumferential direction.