JPH03279548A - Joint structure of steel pipe column with slab in flat slab structure - Google Patents

Abstract

PURPOSE:To facilitate the execution of works by providing a plurality of continuous reinforcing bars for the installation of a column with a beam at an upper and a lower section in such a way as to be penetrated through, and thereby providing the continuous reinforcing bars with reinforcing members through which concrete can be easily placed, in such a way as to be penetrated through the critical cross section of shear fracture. CONSTITUTION:A steel pipe column 2 composed of a steel pipe 2a is vertically erected in each slab 3. Continuous reinforcing bars 5 composed of an upper reinforcing bar 5b and a lower reinforcing bar 5c are provided for the intersection 1a of the slab 3 and the column 2 in such a way that the column 2 is penetrated therethrough horizontally from the plural directions of the steel pipe 2a, so that both of the reinforcing bars 5b and 5c are fastened onto the steel pipe 2a with presser nuts 5a at the both sides of them. And each strengthening reinforcing bar 6a composed of each reinforcing steel plate of length L1 is connected to each end section of the upper and lower reinforcing bars 5b and 5c via each tie-in nut 7. Furthermore, each reinforcing steel plate 6b is interposed between paired strengthening reinforcing bars 6a in such a way that each space between the reinforcing bars 6a is sustained while each steel plate passes through each critical cross section CS of shear fracture.

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a joint structure between a steel pipe column and a slab in a flat slab structure in which the reinforcing material is lightweight and easy to construct. Conventionally, in flat slab structures, there is a risk of shear failure (punching failure) occurring near the joints between columns and slabs, so reinforcing steel frames assembled in parallel cross-sections have been installed near the critical cross-sections where shear failure occurs. It was installed in such a way that it penetrated the pillars and provided shear reinforcement.

(C) 0 Problems to be Solved by the Invention However, when a steel pipe column is used as a column, it is difficult to install a reinforcing steel frame to penetrate the column, and it has been desired to develop some other method.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide a joint structure between a steel pipe column and a slab in a flat slab structure using a steel pipe column as a column.

(d) Means for solving the zero problem, that is, the present invention has a slab (3), the slab (3)
In a flat slab structure (1) consisting of a steel pipe column (2) having a steel pipe (2a) erected at the column-beam intersection (1
Upper reinforcement (5b) and lower reinforcement (5C) are attached to the steel pipe (2a) in a).
), etc., are arranged vertically and penetrating the steel pipe (2a), and these through bars (5)
It is constructed by providing easy-to-place concrete reinforcing materials (6, 9) in a form that passes through the critical cross section (CS) of shear failure.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings.

This description is not limited to the description on the drawings.

The same applies to the column "r(e), Effect" below.

(e) 0 Effect With the above configuration, in the present invention, the easy-to-place concrete reinforcing material (6, 9) acts to support the shearing force in the slab (3) surrounding the steel pipe column (2).

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing one embodiment of a joint structure between a steel pipe column and a slab in a flat slab structure according to the present invention, and FIG. 2 is a front view showing another embodiment of the present invention.

As shown in FIG. 1, the flat slab structure 1 has a slab 3 constructed horizontally, and a steel pipe column 2 made of a steel pipe 2a is vertically installed on the slab 3. . At the intersection 1a between the slab 3 and the steel pipe column 2, an upper reinforcement 5b is provided.
A through reinforcement 5 consisting of a lower reinforcement 5C and a lower reinforcement 5C is provided horizontally through the steel pipe column 2 from multiple directions of the steel pipe 2a, and both sides of the upper reinforcement 5b and the lower reinforcement 5c are provided with holding nuts 5a, 5a.
It is fixed to the steel pipe 2a by. Connecting nuts 7 are attached to both ends of the thread 5 consisting of a pair of upper reinforcement 5b and lower reinforcement 5c.
．． Reinforced iron plates 6.6 each having a length of Ll are connected to each other via 7, and each reinforced iron plate 7 has a pair of reinforcing reinforcing bars 6a, 6a connected to the upper reinforcement 5b and the lower reinforcement 5C. are doing. A reinforcing steel plate 6b made of a plate-shaped steel plate is provided between the pair of reinforcing reinforcing bars 6a, 6a to connect both the reinforcing bars 6a, 6a, and the reinforcing steel plate 6b is a flat slab structure. It is installed so that it passes through the critical cross section CS where the risk of shear failure due to the shear stress generated in the first column layer is highest. Although not shown, at the column-beam intersection 1a of the slab 3 and the steel pipe column 2, a large number of ordinary reinforcing bars constituting the slab 3 are also installed horizontally in FIG. 1 and in a direction perpendicular to the plane of the paper.

Since the flat slab structure 1 has the above-mentioned configuration, the steel pipe columns 2
The shear stress that leads to shear failure occurring around the slab 3 is supported by the reinforcing iron plate 6b, etc., which is provided so as to pass through the critical cross section CS, and punching failure of the slab 3 is prevented.

Note that the above-mentioned embodiment is as shown in FIG.

The case has been described in which the reinforcing iron plate material 6 having the reinforcing iron plate 6b is provided on the through bar 5.1 The present invention provides a reinforcing material for easily placing concrete that allows concrete to be placed on the through bar 5 in good condition. It goes without saying that any configuration may be used as long as it is provided, and for example, as shown in FIG. In the example shown, the through bar 5 is provided in a form integrated with the truss bar 9 on the left side of the figure, and the connection with the joint nut 7 is made only on the right side of the figure. By this, joint nut 7
This reduces the connection work by half, and the installation work of the truss bars 9 becomes easier. Furthermore, the truss bar 9 is
．． The tip of the truss bar 9 may be inserted into the steel pipe 2a, and the truss bar 9 or the like may be fixed to the steel pipe 2a using concrete as a lap joint.

(g) 0 Detailed Description of the Invention According to the present invention, in the flat slab structure 1 which has a slab 3 and has a steel pipe column 2 having a steel pipe 2a erected on the slab 3, the column and A plurality of through reinforcements 5 including upper reinforcements 5b, lower reinforcements 5c, etc. are provided on the steel pipe 2a of the beam intersection 1a, and are arranged vertically so as to penetrate the steel pipe 2a,
Since the reinforcing material for easy concrete placement is provided in the through bars 5 in a manner that passes through the dangerous cross section C8 of shear failure,
The shear stress generated in the slab 3 around the column-beam intersection 18 of the flat slab structure 1 is effectively supported by the easy-to-place concrete reinforcing material installed to pass through the critical cross section C8, preventing punching failure from occurring. can be prevented from occurring.

In addition, since the easy-to-place concrete reinforcing material has high concrete flowability, it is possible to maintain good filling properties of concrete around the dangerous cross section O5 when concrete is placed for slab 3, thereby increasing the reliability of construction. rich in In addition, since the reinforcement 5 is only passed through the steel pipe 2a, when concrete is poured inside the steel pipe 2a, the flowability of the concrete in the steel pipe 2a can also be maintained in a good condition. , which is extremely convenient.

In addition, reinforced steel plate 6 is used as a reinforcing material for easy concrete placement.
If the reinforcing iron plate material 6 provided between the reinforcing reinforcing bars 6a and 68 arranged above and below is used for b, the reinforcing iron plate 6b can be replaced with the reinforcing reinforcing bar 6a.
, 6a, the reinforcing material can be easily manufactured and construction is easy.

Furthermore, truss reinforcement 9 is used as a reinforcing material for easy concrete placement.
By using this method, the reinforcing member can be easily manufactured by simply cutting commercially available truss bars 9 to a predetermined length, and construction is easy.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of a joint structure between a steel pipe column and a slab in a flat slab structure according to the present invention, and FIG. 2 is a front view showing another embodiment of the present invention. 1...Flat slab structure 1a...Intersection 2...Steel pipe column 2a...Steel pipe 3...Slab 5... Through bar 6...Reinforcement steel plate material 6a...Reinforcement steel bar 6b...Reinforcement steel plate 9...Truss bar CS...Dangerous cross section

Claims (3)

[Claims] (1) In a flat slab structure having a slab and steel pipe columns having steel pipes erected on the slab, a plurality of through bars are provided in the steel pipes at the intersection of the pillars and the beams so as to pass through the steel pipes. A joint structure between a steel pipe column and a slab in a flat slab structure, in which reinforcing materials that are easily placed in concrete are placed above and below the reinforcing bars so as to pass through the cross section at risk of shear failure. (2) A steel pipe in a flat slab structure according to claim 1, in which the reinforcing iron plate is used as a reinforcing material for easy concrete placement using a reinforcing iron plate material provided between reinforcing bars arranged above and below. Column and slab joint structure. (3) A joint structure between a steel pipe column and a slab in a flat slab structure according to claim 1, which is constructed using truss reinforcement as a reinforcing material for easy concrete placement.