CN110424548A - A kind of steel core concrete column-arch without beam connecting node and its construction method - Google Patents

Abstract

The invention provides a steel pipe concrete column-beamless floor connection node, in which a part of the reinforced concrete floor connected to the steel pipe concrete column is replaced by a steel casting, and the width of this area is 4-6 times the width of the steel pipe concrete column; The steel casting is composed of a central steel pipe and an orthogonal steel plate grid; the orthogonal steel plate grid is arranged at four sides of the central steel pipe, and the steel plate section connected to the side of the central steel pipe in the orthogonal steel plate grid is The upper end and the lower end are respectively provided with arc-shaped grooves to form a weakened section; the central steel pipe and the column steel pipe are connected by flanges; A round hole is opened on the steel plate, and the steel bars of the surrounding floor slab pass through the round hole and are anchored on the steel plate by bolts. The present invention also provides a construction method for the above connection node.

Description

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

technical field

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

Background technique

The slab-column structure composed of beamless floor and steel tube concrete column has been more and more widely used in building structures because of its advantages of high floor clearance and large building space. However, under the earthquake, the slab-column joints are prone to punching damage, and the resulting floor damage is difficult to repair; if the punching damage of the joints is serious, it may even cause the overall structure to collapse.

Contents of the invention

The object of the present invention is to address the deficiencies in the prior art, and propose a low-damage and easy-to-repair joint between concrete filled steel pipe column and beamless floor.

In order to solve the above-mentioned technical problems, the technical scheme of the present invention is as follows:

A steel pipe concrete column-beamless floor connection node, the part of the reinforced concrete floor connected to the steel pipe concrete column is replaced by cast steel, and the width of this area is 4-6 times the width of the steel pipe concrete column;

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

The central steel pipe and the column steel pipe are connected by flanges; concrete is poured into the column steel pipe to form the steel pipe concrete column, the outermost steel plate of the orthogonal steel plate grid has round holes, and the steel bars of the surrounding floors pass through the round holes. And anchored on the steel plate by bolts.

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

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

2) Integral casting of steel castings on the mould;

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

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

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

6) Pass the steel bar 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 the column steel pipe through flanges;

8) Pouring floor and column concrete. After the concrete strength meets the requirements, cover the steel casting with a steel cover.

Compared with the prior art, 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 joint proposed by the present invention is to weaken the cross-section of the steel plate section connected to the central steel pipe in the steel casting, so as to ensure that the structural yield only occurs under the action of an earthquake In this weakened section, other areas of the slab can be protected from damage, and the structure can be easily repaired. The invention strengthens the punching shear failure resistance of the steel pipe concrete column-beamless floor joint, and has broad application prospects in multi-storey buildings.

Description of drawings

Fig. 1 is a three-dimensional view of the floor;

Fig. 2 is a perspective view of the floor;

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

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

Fig. 6 is a structural diagram of the connection between the outermost steel plate and the steel bar of the steel casting;

In the figure: 1-floor; 2-concrete steel tube column; 3-steel cover plate; 4-flange; 5-rebar; 6-central steel pipe; 7-orthogonal steel plate; ; 10 - bolts.

Specific implementation method

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

Referring to Figures 1-6, a low-damage and easy-to-repair reinforced concrete column-beamless floor connection node, part of the reinforced concrete floor 1 connected to the column 2 is replaced by a cast steel, and the width of this area is the 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 Fig. 3 and Fig. 4 . The orthogonal steel plate grid 7 is arranged at the four sides of the central steel pipe 6, and the steel plate segments connected to the side of the central steel pipe 6 in the orthogonal steel plate grid 7 are provided with arc-shaped grooves at the upper end and the lower end respectively, forming Weakened section 9; in this way, it can be ensured that yielding only occurs in this weakened section 9, other areas of the floor 1 can be protected from damage, and the structure is easy to repair, as shown in Figure 5.

The central steel pipe 6 of the steel casting is connected to the column steel pipe through the flange 4; The outermost outer steel plate 8 of the orthogonal steel plate grid 7 has a round hole, and the steel bars 5 of the surrounding floor pass through the round hole, and are anchored on the steel plate by bolts 10, as shown in FIG. 6 .

Construction method of the present invention comprises the following steps:

(1) Factory prefabrication stage. First of all, according to the thickness of the floor 1 and the section size of the column 2, the steel castings are designed and the corresponding casting molds are made. Then, the steel casting is integrally cast on the mould. Next, the flange 4 is welded on the central steel pipe 6 of the steel casting. Next, according to the position of the floor reinforcement 5, determine the position of the round hole corresponding to the outermost steel plate 8 of the steel casting and complete the drilling.

(2) On-site construction stage. 1 formwork for the floor slab, and position the steel castings at the same time. The steel bar 5 of the floor 1 passes through the outermost steel plate 8 of the orthogonal steel plate grid 7 and is anchored by bolts 10; then, the central steel pipe 6 of the steel casting is connected with the column steel pipe through the flange 4; then, the floor 1 and the Column 2 concrete. After the concrete strength reaches the requirement, the steel plate 3 is covered on the steel casting, and the construction of the connection node of the concrete filled steel pipe column-beamless floor is completed.

The above descriptions are only preferred implementation examples of the present invention, and the implementation scope of the present invention cannot be limited accordingly. That is, the equivalent changes and modifications made according to the patent scope of the present invention and the content of the specification should still fall within the scope of the present invention.

Claims (2)

1. a kind of steel core concrete column-arch without beam connecting node, it is characterised in that: the reinforcing bar being connected with steel core concrete column is mixed The partial region of solidifying Tulou plate is replaced with steel-casting, and the width in the region is 4-6 times of steel core concrete column width；

The steel-casting is made of center steel pipe and orthogonal steel plate grid；The four of the orthogonal centrally disposed steel pipe of steel plate grid A lateral position, and the steel plate section being connected in orthogonal steel plate grid with center steel pipe side, are respectively arranged in top and bottom Arc groove forms and weakens section；

The center steel pipe and column steel pipe pass through flanged joint；Casting concrete forms the steel core concrete column in column steel pipe, Circular hole is provided on the outermost steel plate of the orthogonal steel plate grid, the reinforcing bar of periphery floor passes through circular hole, and anchors by bolt On the steel plate.

2. a kind of construction method of steel core concrete column described in claim 1-arch without beam connecting node, it is characterised in that packet Include following steps:

1) it according to slab thickness, pillar sectional dimension, designs steel-casting and makes corresponding casting die；

2) the integral cast steel-casting on mold；

3) welded flange on the center steel pipe of steel-casting；

4) according to the position of floor bar, determine that orthogonal steel plate grid outermost steel plate corresponds to the position of circular hole and completes to bore Hole；

5) floor slab formerecting, while steel-casting being positioned；

6) reinforcing bar of floor is passed through into orthogonal steel plate grid outermost steel plate and is anchored by bolt；

7) center steel pipe and column steel pipe are passed through into flanged joint；

8) build floor and pillar concrete are poured.After concrete strength reaches requirement, steel deck-plate is covered on steel-casting.