JPH09125518A - Connection part construction method of concrete filled steel pipe pillar and beam member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify welding fixing work of a reinforcing member to a steel pipe pillar and to fill concrete in high density. SOLUTION: Cross shaped reinforcing members 26a, 26b, 26c are fixed in a space in the inside of steel materials 24b, 24c, 24d formed in a square shape with one side open on its cross section by providing an unfixed part extending toward opening parts of the steel materials 24b, 24c, 24d. Thereafter, the opening parts of the steel materials 24b, 24c, 24d are closed by a steel material plate 24a, and a head end part of the unfixed part is inserted into a slit 24a1 formed on the steel material plate 24a. Thereafter, the steel materials 24b, 24c, 24d and the steel material plate 24a are fixed, and a steel pipe pillar 22 is formed by fixing the unfixed part inserted into the inside of the slit 24a1 from outside by welding. Additionally, an end part of a beam member 8 is fixed on an outer surface of the steel pipe pillar 22 at a height position corresponding to the reinforcing members 26a, 26b, 26c against the steel pipe pillar 22 erected so that the reinforcing members 26a, 26b, 26c extend in the vertical direction. Thereafter, concrete 4 is filled in the pipe inside of the steel pipe pillar 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint portion between a concrete filled steel pipe column and a beam member, in which a reinforcing member for increasing the rigidity of the steel pipe column is fixed at a joint position with the beam member in a state of being embedded in concrete. Concerning construction method.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a conventional concrete-filled steel tubular column and beam member joint structure (hereinafter, simply referred to as a prior art). Concrete-filled steel pipe columns 6 are formed by filling the inside of a square-faced steel pipe 2 of four-side welding with concrete 4.
The ends of the four steel beams 8 extending in the horizontal direction are fixed to the four outer surfaces of the concrete-filled steel pipe column 6. Here, in the concrete-filled steel pipe column 6,
A reinforcing member, that is, a horizontal diaphragm 10 for increasing the rigidity of the rectangular steel pipe 2 at a position where it is connected to the steel frame beam 8, is built in and fixed.

As shown in FIG. 7, the horizontal diaphragm 10 has a concrete filling hole 12 formed at the center thereof.
This is a rectangular plate member made of a steel plate or the like having a plurality of air vent holes 14 formed on the outer edge side away from the concrete filling hole 12. This horizontal diaphragm 10 is arranged horizontally in the formed steel pipe when welding the four steel plates forming the square steel pipe 2, and the inner peripheral side of the pipe contacting the horizontal diaphragm 10 is electroslag welded to form the square steel pipe 2. It is fixed together.

When the concrete 4 is poured into the rectangular steel pipe 2 from above, the concrete 4 passing through the concrete filling hole 12 flows downward, and the rectangular steel pipe 2
It is designed to fill the entire interior. This allows
The horizontal diaphragm 10 fixed inside the rectangular steel pipe column 2 enhances the rigidity of the rectangular steel pipe 2, and at the same time, the concrete 4 filled inside the rectangular steel pipe column 2 improves the proof stress of the rectangular steel pipe column 2 against a vertical load.

[0005]

However, in the prior art, since the horizontal diaphragm 10 has to weld the narrow portion such as the inner peripheral side of the steel pipe by the electroslag welding method, a skill is required for the welding work. As described above, the conventional technique is disadvantageous in terms of work efficiency when fixing the horizontal diaphragm 10 in the rectangular steel tube column 2 by welding.

Further, in the prior art, when concrete 4 is poured from above, air is likely to accumulate on the lower surface of the horizontal diaphragm 10 which extends horizontally inside the rectangular steel tube column 2. Here, in the related art, the horizontal diaphragm 10 is provided with the air vent hole 14, but even if the air vent hole 14 is provided, the air vent hole 14 is made of aggregate (gravel or the like).
Is blocked and air is likely to collect. The concrete 4 solidified in the state where the air is accumulated causes voids to form the concrete-filled steel tube column 6 incompletely filled with concrete, which is likely to be disadvantageous in terms of the vertical proof strength of the concrete-filled steel tube column.

The present invention has been made in view of the above circumstances, and simplifies the work of welding and fixing a reinforcing member to a steel pipe column, and at the same time, enables concrete-filled steel pipe to be filled with concrete at a high density. It is an object of the present invention to provide a joint construction method for columns and beams.

[0008]

According to the method for constructing a joint between a concrete-filled steel pipe column and a beam member according to the present invention, a reinforcing member formed in at least a cross shape is provided in an internal space of a steel member having a U-shaped cross section. A part fixed to the inner wall of the by welding,
A step of providing an unfixed portion extending toward the opening of the steel material and arranging the internal space so as to extend along the longitudinal direction while partitioning the internal space into a plurality of regions; At the same time as being closed by the plate, inside the slit formed to penetrate in the plate thickness direction of the steel plate,
Inserting the tip of the unfixed portion extending toward the opening of the steel material, fixing the abutting portion of the steel material and the steel material plate, further outside the unfixed portion inserted into the slit A step of forming a steel pipe column in which the reinforcing member is arranged inside the pipe by fixing it by welding, and the reinforcing member stands up so as to partition the inside of the pipe into a plurality of regions in a horizontal plane and extend in the vertical direction. A step of fixing the end portion of the beam member to the outer surface of the steel pipe column at a height position corresponding to the reinforcing member with respect to the provided steel pipe column;
And a step of filling the inside of the steel pipe column with concrete.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The same components as those of the conventional technique shown in FIGS. 6 and 7 are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a plan view showing the joint structure of the concrete-filled steel tubular column 20 and the steel beam (beam member) 8 of this embodiment. The concrete-filled steel pipe column 20 is a square steel pipe (steel pipe column) 2 having a rectangular cross section.
2 is formed by filling the inside of 2 with concrete 4, and the ends of the steel beam 8 are fixed to each of the outer surfaces of the square steel pipe 22 facing the four directions by welding.

The quadrangular square steel pipe 22 is composed of four rectangular plate-shaped steel plates 24a to 24d having the same outer diameter, and one of the steel plates 24a has a plate thickness. Slit 24 penetrating in the direction
Two a ₁ are formed at positions separated in the longitudinal direction. The opening shape of these slits 24a ₁ is formed to be slightly larger than the cross-sectional shape of the third reinforcing plate 26c described later.

And, these steel material plates 24a to 24
Adjacent members of d are made orthogonal to each other and butt welded at their widthwise edges to form a quadrangular cross section, and the internal space 22a of the rectangular steel pipe 22 has a cross shape. First to third reinforcing plates (reinforcing members) 26a to 26c, which are flat plate members made of a steel plate having an appearance, are fixed.

First, when the rectangular steel pipe 22 is formed, as shown in FIG. 2, for example, a steel plate 24c is used as a bottom member, and two steel plates 24b and 24d are provided on both widthwise edges of the steel plate 24c. Are fixed together by butt welding. As a result, the opening 28 is provided above by the three steel plates 24b to 24d formed in the U-shaped cross section.

Next, these three steel plates 24b
The first to third reinforcing plates 26a to 26c are fixed to the inner space surrounded by the inner walls of ˜24d so as to partition the inner space into a plurality of spaces. The length of the third reinforcing plate 26c in the width direction is set to be longer than the length of the second reinforcing plate 26b in the width direction by the plate thickness of the steel plate 24a.

The second and third reinforcing plates 26b,
26c is orthogonally arranged with respect to the first reinforcing plate 26a and is fixed by fillet welding so as to have a cross shape. Further, both edges of the first reinforcing plate 26a are brought into contact with the inner side surfaces of the steel plates 24b and 24d facing each other, and the periphery of the abutting portion is fixed by fillet welding. Also, the second
Both edge portions in the width direction of the reinforcing plate 26b are connected to the steel plate 2
The inner surface of 4c is abutted, and the periphery of the abutting portion is fixed by fillet welding. Thereby, the third reinforcing plate 26c
The other end portion (unfixed portion) 26c ₁ of, extends toward the opening 28.

The three steel plates 24b to 2b are arranged so as to be arranged on the inner surface side at the same height as the upper and lower flanges 8a and 8b of the steel beam 8 fixed to the outer surface of the rectangular steel pipe 22.
Another set of first to third reinforcing plates 26a, 26 is also provided at positions spaced apart in the longitudinal direction of the internal space formed by 4d.
Fix b and 26c. Then, the fourth steel plate 24a having the slits 24a ₁ is provided with two steel plates 24b, 2b so as to close the opening 28.
It contacts the upper end of 4d. At that time, the above-mentioned opening 28
The other end portion 26c ₁ of the third reinforcing plate 26c extending toward is inserted into the slit 24a ₁ .

Then, as shown in FIG.
a ₁ and the other end 26 of the third reinforcing plate 26c
The contact portion of c ₁ is fixed by butt welding from the groove surface opened to the outside of the steel plate 24a (the portion indicated by reference symbol A in FIG. 3). The fourth steel plate 24a
And the abutting portions of the upper ends of the two steel plates 24b and 24d are fixed by butt welding (symbol B in FIG. 3).
Part shown with). As a result, the rectangular steel pipe 22 in which the first to third reinforcing plates 26a, 26b, 26c are fixed is formed in the internal space 22a.

Then, as shown in FIG.
The end of the steel beam 8 is cruciform on the outer surface of the square steel pipe 22 provided.
Corresponding to the reinforcing plates 26a, 26b, 26c of
Fixed to the inside of the square steel pipe 32 from above and concrete
Concrete-filled steel pipe column 20 by pouring 4
The structure of the joint portion of the steel beam 8 is obtained. Therefore,
In the embodiment, the three steel plates 24b, 24c, 24
When it is formed into a U-shaped cross section by d, the third reinforcement
The other end 26c of the rate 26c ₁Point only the opening 28
The second reinforcing plate 26c and the second end of the third reinforcing plate 26c.
And the third reinforcing plates 34a, 34b to the steel plate 2
Fixing to the inner wall of 4b, 24c, 24d by welding
Since it is possible to perform welding work in narrow spaces like conventional technology
It is solved and welding work does not require skill. Also,
The last steel material plate 24a forming the rectangular steel pipe 22 is
Traverse with other steel plates 24b, 24c, 24d
Steel plate when formed into a square shape
Slit 24a formed in 24a₁To the third reinforcement pre
The other end 26c of the port 26c₁Insert and slit them
24a₁And the other end 26c₁The abutting part of the steel plate
It can be fixed by butt welding from the outside of 24a.
Can significantly improve the efficiency of welding work.
be able to.

The first to third reinforcing plates 26a, 2
Since 6b and 26c extend and are fixed in the pipe interior 22a of the rectangular steel pipe 22 in the vertical direction, there is no portion where air is accumulated even when the concrete 4 is poured. Therefore, no voids are generated in the concrete 4 solidified inside the rectangular steel pipe 22, and the concrete can be filled with high density. Therefore, concrete-filled steel pipe columns 2
It is possible to sufficiently secure the vertical proof stress of 0.

Further, the first to third reinforcing plates 26a, 26b and 26c fixed at the joint positions of the rectangular steel pipe 22 are
Since it is fixed in the inner space 22a of the rectangular steel pipe 22 in a cross shape in a plan view, it is possible to provide a joint structure in which the rigidity of the rectangular steel pipe 22 is reinforced reliably. In the present embodiment, the first to third reinforcing plates 26a, 26b, 26c are fixed in a cross shape in the internal space 22a of the rectangular steel pipe 22, but the present invention is not limited to this, and for example, in FIG. As shown, even if more slits 24a ₂ and 24a ₃ are formed in the steel plate 24a and a plurality of reinforcing plates 30a to 30d are arranged and fixed in a grid pattern, the concrete 4 is filled with high density. The rigidity of the rectangular steel pipe 22 can be ensured.

Further, in the present embodiment, the example in which the square steel pipe 22 is formed by the four steel plates 24a to 24d has been shown, but the present invention is not limited to this, and for example, the slit 24a.
Other steel materials except the steel material plate 24a forming ₁
Even if it is integrally formed in a U-shaped cross section by cold rolling or the like, the same effect can be obtained. Further, in the present embodiment, the square steel pipe column 32 and the steel frame beam 8 are fixed by welding, but this is an example. For example, the steel pipe column and the steel frame beam are fixed via a connecting member such as a split stay. Even
It does not depart from the gist of the present invention.

[0021]

As described above, according to the method for constructing the joint between the concrete-filled steel pipe column and the beam member of the present invention, the inner wall of the steel material is fixed to the inner space of the steel material by welding in the inner space of the U-shaped cross section. And the unfixed portion extending toward the opening of the steel material is provided and the reinforcing member formed in at least a cross shape is arranged, so that the welding work in the narrow portion as in the prior art is eliminated. Further, at the same time as closing the opening of the steel material with the steel material plate, after performing the step of inserting the tip of the unfixed portion extending toward the opening of the steel material inside the slit formed in the steel material plate, the steel material and Fixing the abutting part of the steel plate, and further fixing the unfixed part inserted into the slit by welding from the outside forms a steel pipe column in which the reinforcing member is arranged inside the pipe, so skill is required for welding work. Never. Therefore, the present invention can significantly improve the work efficiency when fixing the reinforcing member by welding.

Further, since the reinforcing member is fixed by extending in the vertical direction inside the pipe of the steel pipe column, even if concrete is poured into the pipe, there is no place where air is accumulated in the reinforcing member or other places. . For this reason, voids do not occur at all in the concrete solidified inside the steel pipe column, and the concrete can be filled with high density. Therefore, the vertical proof stress of the concrete-filled steel tubular column can be sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a plan view showing a joint structure of a concrete-filled steel pipe column and a beam member according to the present invention.

FIG. 2 is a perspective view showing a steel material, a steel material plate, and a cross-shaped reinforcing member according to the present invention.

FIG. 3 is a perspective view showing a state in which a steel plate closes an opening of a steel material.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a plan view showing another embodiment of the present invention.

FIG. 6 is a plan view showing a conventional joint structure of a concrete filled steel pipe column and a beam member.

FIG. 7 is a plan view showing a concrete-filled steel pipe column and beam member of the conventional joint structure shown in FIG.

[Explanation of symbols]

4 Concrete 8 Beams 20 concrete filled steel tube column 22 steel column 24a steel plates 24a _1, 24a _2, 24a ₃ slits 24b~24d steel plate (transverse section a U-shaped steel) 26a, 26b, 26c reinforcing plate (cruciform Reinforcement member) 26c ₁ Unfixed portion of reinforcement member 28 Opening of steel material 30a to 30e Reinforcement plate

Claims (1)

[Claims] 1. A portion in which a reinforcing member, which is formed in a cross shape by a flat plate member, is fixed to an inner wall of the steel material by welding in an internal space of the steel material having a U-shaped cross section, and an opening portion of the steel material. A step of providing an unfixed portion that extends toward and arranging the internal space so as to extend along the longitudinal direction while partitioning the internal space into a plurality of regions, and simultaneously closing the opening of the steel material with a steel material plate. The step of inserting the tip end portion of the unfixed portion extending toward the opening of the steel material into the slit formed through the steel material plate in the plate thickness direction of the steel material plate and the steel material plate Fixing a butt portion, and further forming a steel pipe column in which the reinforcing member is arranged inside the pipe by fixing an unfixed portion inserted into the slit by welding from the outside, Reinforcing the steel pipe column that is erected so that the reinforcing member divides the inside of the pipe into a plurality of regions in a horizontal plane and extends vertically, on the outer surface of the steel pipe column at a height position corresponding to the reinforcing member. A method for constructing a joint between a concrete-filled steel tubular column and a beam member, which comprises a step of fixing an end portion of the beam member and a step of filling concrete inside the pipe of the steel tubular column.