CN110424548B - Steel pipe concrete column-beamless floor connecting node and construction method thereof - Google Patents

Abstract

The invention provides a steel tube concrete column-flat slab connecting node, wherein part of the area of a reinforced concrete floor slab connected with the steel tube concrete column is replaced by a steel casting, and the width of the area is 4-6 times of that of the steel tube concrete column; the steel casting consists of a central steel pipe and an orthogonal steel plate grid; the orthogonal steel plate grids are arranged on four sides of the central steel pipe, and steel plate sections connected with the sides of the central steel pipe in the orthogonal steel plate grids are respectively provided with arc-shaped grooves at the upper end and the lower end to form a weakening zone; the central steel pipe is connected with the column steel pipe through a flange; and concrete is poured into the column steel pipes to form the steel pipe concrete column, round holes are formed in the outermost steel plates of the orthogonal steel plate grids, and steel bars of the peripheral floor slabs penetrate through the round holes and are anchored on the steel plates through bolts. The invention also provides a construction method of the connecting node.

Description

A steel tube concrete column-beamless floor connection node and its construction method

Technical field

The invention relates to the technical field of energy consumption and shock absorption control in building structures, and in particular to a low-damage and easy-to-repair steel tube concrete column-beamless floor connection node.

Background technique

The slab-column structure composed of a beamless floor and a steel tube concrete column has been increasingly used in building structures due to its advantages such as high floor clearance and large building space. However, under the action of earthquakes, plate-column connection nodes are prone to punching damage, and the resulting damage to the floor is difficult to repair; if the node punching damage is severe, it may even cause the collapse of the entire structure.

Contents of the invention

The purpose of the present invention is to propose a low-damage and easy-to-repair steel tube concrete column-beamless floor connection node in view of the deficiencies in the prior art.

In order to solve the above technical problems, the technical solutions of the present invention are as follows:

A concrete-filled steel tube column-beamless floor connection node, in which part of the reinforced concrete floor connected to the concrete-filled steel tube column is replaced by a steel casting, and the width of this area is 4-6 times the width of the concrete-filled steel tube column;

The steel casting is composed of a central steel pipe and an orthogonal steel plate grid; the orthogonal steel plate grid is arranged on the four sides of the central steel pipe, and the steel plate segments in the orthogonal steel plate grid connected to the sides of the central steel pipe are The upper end and lower end are respectively provided with arc-shaped grooves to form weakened sections;

The central steel pipe and the column steel pipe are connected through flanges; concrete is poured into the column steel pipe to form the steel tube concrete column. There are round holes on the outermost steel plate of the orthogonal steel plate grid, and the steel bars of the peripheral floor plates pass through the round holes. And anchored to the steel plate through bolts.

The present invention also provides a construction method for the steel tube concrete column-beamless floor connection node as mentioned above, which includes the following steps:

1) According to the thickness of the floor slab and the cross-sectional size of the column, design the steel casting and make the corresponding casting mold;

2) Cast the steel casting integrally on the mold;

3) Weld the flange on the central steel pipe of the steel casting;

4) According to the position of the floor steel bars, determine the position of the corresponding circular hole in the outermost steel plate of the orthogonal steel plate grid and complete the drilling;

5) Support the floor slab and position the steel castings at the same time;

6) Pass the steel bars of the floor slab through the outermost steel plate of the orthogonal steel plate grid and anchor it with bolts;

7) Connect the central steel pipe and column steel pipe through flanges;

8) Pour concrete for floor slabs and columns. After the concrete strength reaches the required level, the steel casting is covered with a steel cover plate.

Compared with the existing technology, the present invention has the following advantages and outstanding effects:

The outstanding feature of the low-damage and easy-to-repair concrete-filled steel tube column-beamless floor connection node proposed by the present invention is to weaken the section of the steel plate section connected to the central steel pipe in the steel casting, thereby ensuring that the structural yield only occurs under earthquake action. In this weakened section, other areas of the floor slab can be protected from damage and the structure can be easily repaired. The invention enhances the punching shear resistance of the steel tube concrete column-beamless floor connection node, and has broad application prospects in multi-story buildings.

Description of the drawings

Figure 1 is a three-dimensional view of the floor;

Figure 2 is a perspective view of the floor;

Figures 3 and 4 are respectively a three-dimensional view and a plan view of the steel casting;

Figure 5 is a detailed structural diagram of the steel casting;

Figure 6 is a structural diagram of the connection between the outermost steel plate and steel bars of the steel casting;

In the picture: 1 - floor slab; 2 - concrete filled steel tube column; 3 - steel cover plate; 4 - flange; 5 - steel bar; 6 - central steel pipe; 7 - orthogonal steel plate; 8 - outermost steel plate; 9 - section weakened area ;10-bolt.

Specific implementation methods

The specific implementation methods of the present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 6, a low-damage and easy-to-repair reinforced concrete column-beamless floor connection node is used. Part of the reinforced concrete floor 1 connected to column 2 is replaced with steel castings. The width of this area is column 2. 4-6 times the width, as shown in Figure 1 and Figure 2. The steel casting is composed of a central steel pipe 6 and an orthogonal steel plate grid 7, as shown in Figures 3 and 4. The orthogonal steel plate grid 7 is arranged on the four sides of the central steel pipe 6, and the steel plate sections in the orthogonal steel plate grid 7 connected to the sides of the central steel pipe 6 are respectively provided with arcuate grooves at the upper and lower ends to form Weakened section 9; this can ensure that yielding only occurs in this weakened section 9, other areas of the floor 1 can be protected from damage, and the structure can be easily repaired, as shown in Figure 5.

The central steel pipe 6 of the steel casting is connected to the column steel pipe through a flange 4; concrete is poured into the steel pipe 6 to form a concrete-filled steel tube column 2, ensuring that the shear force and bending moment of the floor slab 1 can be reliably transmitted to the column 2. There are round holes in the outermost peripheral steel plate 8 of the orthogonal steel plate grid 7, and the steel bars 5 of the peripheral floor pass through the round holes and are anchored to the steel plate through bolts 10, as shown in Figure 6.

The construction method of the present invention includes the following steps:

(1) Factory prefabrication stage. First, according to the thickness of the floor slab 1 and the cross-sectional size of the column 2, the steel castings are designed and the corresponding casting molds are made. The steel casting is then integrally cast on the mould. Next, the flange 4 is welded to the central steel pipe 6 of the steel casting. Then, according to the position of the floor steel bars 5, the position of the corresponding circular hole in the outermost steel plate 8 of the steel casting is determined and the drilling is completed.

(2) On-site construction stage. 1 formwork for the floor slab, and position the steel castings at the same time. Pass the steel bars 5 of the floor slab 1 through the outermost steel plate 8 of the orthogonal steel plate grid 7 and anchor it with bolts 10; then, connect the central steel pipe 6 of the steel casting to the column steel pipe through the flange 4; then, pour the floor slab 1 and Pillars 2 concrete. After the concrete strength reaches the requirement, the steel plate 3 is covered on the steel casting, and the construction of the concrete-filled steel tube column-beamless floor connection node is completed.

The above descriptions are only preferred implementation examples of the present invention and cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made based on the patent scope of the present invention and the content of the description should still be within the scope of the present invention.

Claims (1)

1. A construction method for steel tube concrete column-beamless floor connection nodes, which is characterized by: Part of the reinforced concrete floor slab connected to the concrete-filled steel tube columns is replaced with steel castings, and the width of this area is 4-6 times the width of the concrete-filled steel tube columns; The steel casting is composed of a central steel pipe and an orthogonal steel plate grid; the orthogonal steel plate grid is arranged on the four sides of the central steel pipe, and the steel plate segments in the orthogonal steel plate grid connected to the sides of the central steel pipe are The upper end and lower end are respectively provided with arc-shaped grooves to form weakened sections; The central steel pipe and the column steel pipe are connected through flanges; concrete is poured into the column steel pipe to form the steel tube concrete column. There are round holes on the outermost steel plate of the orthogonal steel plate grid, and the steel bars of the peripheral floor plates pass through the round holes. And anchored to the steel plate through bolts; The construction method includes the following steps: 1) According to the thickness of the floor slab and the cross-sectional size of the column, design the steel casting and make the corresponding casting mold; 2) Cast the steel casting as a whole on the mold; 3) Weld the flange on the central steel pipe of the steel casting; 4) According to the position of the floor slab steel bars, determine the position of the corresponding circular hole in the outermost steel plate of the orthogonal steel plate grid and complete the drilling; 5) Support the floor formwork and position the steel castings at the same time; 6) Pass the steel bars of the floor slab through the outermost steel plate of the orthogonal steel plate grid and anchor it with bolts; 7) Connect the central steel pipe and column steel pipe through flanges; 8) Pour concrete for floor slabs and columns. After the strength of the concrete reaches the required level, cover the steel casting with a steel cover plate.