JPH09316877A - Joint structure for fill steel pipe concrete column and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure which can easily joint a beam and a filled steel pipe concrete column without welding. SOLUTION: In a connection structure for a charged concrete column 1 to a beam 10, concrete 3 is filled into a steel pipe 2. In this case, plural root- wrapped steel pipes 12, 13 are concentrically disposed at a connection part 11 of the beam 10, the charged steel pipe concrete column 1 is inserted into the innermost root-wrapped steel pipe 13, and mortar 14 is filled in a gap between the root-wrapped steel pipes 12, 13, and a gap between the root-wrapped steel pipe 13 and the charged steel pipe concrete column 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a filled steel pipe concrete column and a beam in which a steel pipe is filled with concrete.

[0002]

2. Description of the Related Art As is well known, a filled steel pipe concrete structure is a kind of steel-concrete composite structure in which the inside of a steel pipe is filled with concrete, and has recently been widely adopted as a structure for high-rise buildings. A column in such a filled steel pipe concrete structure, that is, as a joint structure of a filled steel pipe concrete column and a beam formed by filling concrete in a steel pipe, conventionally, in the beam joint part, a part of the main bar of the beam is filled. It is known that a beam and a column are integrated by penetrating a steel pipe of a steel pipe concrete column and then placing concrete inside the steel pipe. Also, only the beam joint is manufactured by separating the steel pipe, the beam steel frame and the beam reinforcement are welded to the steel pipe, and the steel pipes are butt-welded to the upper and lower parts of the steel pipe and joined together, and inside the continuous steel pipes above and below. It is also known to fill concrete.

[0003]

However, in the above-mentioned conventional joint structure, the through-bars (main bars) of the beam are penetrated into the steel pipe of the filled steel pipe concrete column, or the steel pipes are connected and welded. However, there was a problem that it was complicated and the workability was poor.

In view of the above circumstances, an object of the present invention is to provide a joint structure of a filled steel pipe concrete column and a beam, which can easily join the beam and the filled steel pipe concrete column without welding.

[0005]

According to a first aspect of the present invention, in a joint structure of a filled steel pipe concrete column and a beam in which the inside of a steel pipe is filled with concrete, a plurality of neck-wound steel pipes are provided in a joint portion of the beam. Arranged concentrically, while inserting the filled steel pipe concrete column inside the innermost root-wrapped steel pipe,
It is characterized in that a filling material is filled and solidified in a gap between the root-wound steel pipes and a gap between the root-wound steel pipe and the filled steel pipe concrete column.

According to a second aspect of the present invention, in the first aspect, the outermost circumference of the neck-wound steel pipe is a square steel pipe.

A third aspect of the present invention is characterized in that, in the first or second aspect, the beam is a foundation beam, and the lower end of the filled steel pipe concrete column is joined to the foundation beam.

A fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the height of the neck-wound steel pipe is set higher in order from the outer peripheral side to the inner peripheral side.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a joining structure of the embodiment, and FIG. 3 is an exploded view. This joint structure is a structure in which the lower end of a filled steel pipe concrete column 1 in which a steel pipe 2 having a circular cross section is filled with concrete 3 is joined to a foundation beam 10 of a reinforced concrete structure. In this case, even if the concrete of the filled steel pipe concrete pillar 1 or the foundation beam 10 is made of precast concrete, at least the concrete (or mortar) at the joint portion is cast on site. Of course, all the concrete of the filled steel pipe concrete pillar 1 or the foundation beam 10 may be cast on site.

In this joint structure, the joint portion 1 of the foundation beam 10 is
1, double-wrapped steel pipes 12, 13 are concentrically arranged. In this case, the outer neck-wound steel pipe 12 is made of a rectangular steel pipe that is easy to fit with the foundation beam 10, and the inner neck-wound steel pipe 13 is made of a circular steel pipe. Then, the lower end of the filled steel pipe concrete column 1 is inserted inside the inner rolled steel pipe 13, and the mortar is inserted into the gap between the rolled steel pipes 12 and 13 and the gap between the inner wound steel pipe 13 and the filled steel pipe concrete column 1. Fill 14 and solidify.

In this case, the outer neck-wound steel pipe 12 is set to a height that slightly projects from the upper end of the foundation beam 10, and the inner root-wound steel pipe 13 is set to be slightly higher than that.
Therefore, the height increases from the outside. In addition, 16 in FIGS. 2 and 3 is a beam rebar.

In this structure, since the lower end of the filled steel pipe concrete column 1 having a circular cross section is embedded in the foundation beam 10 through the multiple root-wound steel pipes 12 and 13, it can be easily installed and the strength of the joint is increased. be able to. Further, by inserting the lower end of the filled steel pipe concrete pillar 1 into the root-wound steel pipe 13 and filling the mortar, the filled steel pipe concrete pillar 1 and the foundation beam 10 can be joined without welding, which shortens the construction period. The cost can be reduced. In particular, since the square steel pipe is used as the root-wound steel pipe 12 on the outer peripheral side, the connection with the foundation beam 10 is easy and the construction can be facilitated. Further, since the heights of the neck-wound steel pipes 12 and 13 are changed so as to increase from the outside in order, the transition from the foundation beam 10 to the column 1 becomes stepwise, and the stress transmission between the column 1 and the foundation beam 10 is smooth. become.

The present invention can be applied to joining beams other than foundation beams and filled steel tubular concrete columns, and also to cases where the filled steel tubular concrete columns have a rectangular cross section. Further, the number of the neck-wound steel pipes may be increased. Further, not only at the lower end of the filled steel tube concrete column, the filled steel tube concrete column is penetrated through the inside of the neck-wound steel tube 13 so that the middle portion in the length direction of the filled steel tube concrete column 1 is located at the position of the neck-wound steel tube 13. It may be arranged at.

[0014]

As described above, according to the first aspect of the present invention, the strength of the joint can be increased by arranging multiple root-wound steel pipes on the outer circumference of the column. In addition, since the pillar and the beam can be joined without welding by inserting the pillar and filling the filler, the work period can be shortened and the cost can be reduced.

According to the second aspect of the present invention, when the filled steel pipe concrete column having a circular cross section and the beam are to be joined, the outermost peripheral wound steel pipe is composed of the square steel pipe, so that the connection with the beam becomes easy. , The structure of the joint is simplified.

According to the invention of claim 3, it is possible to easily join the foundation beam and the filled steel pipe concrete column with sufficient strength.

According to the invention of claim 4, since the height of the neck-wound steel pipe is sequentially changed, a stepwise change can be given to the transition portion from the beam to the column, and the stress transmission between the column and the beam can be achieved. It can be done smoothly.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment of the present invention.

FIG. 3 is an exploded perspective view of an embodiment of the present invention.

[Explanation of symbols]

 1 Filled steel pipe concrete pillar 2 Steel pipe 3 Concrete 10 Foundation beam 11 Beam joint part 12, 13 Nemaki steel pipe 14 Mortar (filler)

Claims (4)

[Claims] 1. In a joint structure of a filled steel pipe concrete column and a beam, wherein a steel pipe is filled with concrete, a plurality of root-wound steel pipes are concentrically arranged in a joint portion of the beam,
It is characterized in that the filling steel tube concrete column is inserted inside the innermost steel pipe of the innermost circumference, and the filling material is filled and solidified in the gap between the root winding steel pipes and the gap between the root winding steel pipe and the filling steel pipe concrete column. Filled steel pipe concrete column and beam joint structure. 2. The joint structure of a filled steel pipe concrete column and a beam according to claim 1, wherein the outermost peripheral pipe of the neck-wound steel pipe is formed of a square steel pipe. 3. The joint structure of a filled steel pipe concrete column and a beam according to claim 1, wherein the beam is a foundation beam, and the lower end of the filled steel pipe concrete column is joined to the foundation beam. 4. The joint structure of a filled steel pipe concrete column and a beam according to claim 1, wherein the height of the neck-wound steel pipe is set higher in order from the outer peripheral side to the inner peripheral side.