JP2570974Y2 - Joint structure between reinforced concrete columns and steel beams - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column-beam joint structure of a composite structure having a reinforced concrete column and a steel beam.

[0002]

2. Description of the Related Art Structural forms including reinforced concrete columns and steel beams are used in buildings such as office buildings, shopping centers, and warehouses. This type of structure is excellent in that the span can be lengthened and the construction can be rationalized.However, since it is to assemble heterogeneous structural members such as reinforced concrete and steel frame, the joint at these members Stress transmission is an important issue.

[0003] Japanese Patent Application Laid-Open No. 1-290844 discloses a joint between a reinforced concrete column and a steel beam, which is covered with a steel plate, in order to join the reinforced concrete column and the steel beam while maintaining sufficient mechanical strength. A joint structure is disclosed in which cross-shaped horizontal diaphragms respectively connected to the upper and lower flanges of the beam are provided so as to protrude outward from the steel plate, and furthermore, the horizontal diaphragm is provided with a hole for filling concrete and a hole for penetrating a reinforcing bar. .

[0004] This joining structure is excellent in that the joint portion is covered with a steel plate, so that the concrete has a large restraining effect in the panel zone. However, the steel plate processing such as projecting a horizontal diaphragm from the steel plate covering the joining portion is excellent. There is a problem that the operation becomes complicated.

In Japanese Utility Model Laid-Open Publication No. 3-31604,
There is disclosed a structure in which a lattice-shaped horizontal diaphragm made of cast iron is provided at the intersection of the upper and lower flanges of the steel pipe column and the steel beam at the joint between the steel pipe concrete column and the steel beam. The above joint structure is designed to increase the strength and rigidity of the horizontal diaphragm and to reduce the size of the joint.
The member price must be expensive.

[0006]

[Purpose of the invention] The purpose of the invention is to adopt a simple structure at the joint between a reinforced concrete column and a steel beam,
It is an object of the present invention to provide a joint structure which can secure required strength, can be easily prefabricated, and has good workability during construction.

[0007]

[Constitution of the Invention] The present invention relates to a joint structure between a reinforced concrete column and a steel beam in which the joint between the reinforced concrete column and the steel beam is covered with a steel pipe or a steel plate. A plurality of rectangular steel pipes cut in a ring shape on the steel pipe or the steel plate are fixed in a cross shape at a position where the steel pipe or the steel sheet is formed.

[0008]

In the joint structure between the reinforced concrete column and the steel beam, the stress of the steel beam is reliably transmitted to the reinforced concrete column via the steel pipe or the steel plate surrounding the joint and the square steel pipe disposed inside. Further, the steel pipe or the steel plate appropriately restrains the concrete in the panel zone.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a joint between a reinforced concrete column and a steel beam according to the present invention, and FIG. 2 is a II-II of FIG.
It is a vertical side view in a line.

The reinforced concrete column 10 in which the column main bars 12 and the band bars 14 are embedded is made of cast-in-place concrete or a precast member, and the panel zone to which the steel beam 20 is connected is a square steel pipe and a steel plate having the same sectional shape as the column 10. Is enclosed by a closing plate 30 made of. Closing plate 30
The length (height) extends slightly above and below the upper and lower flange positions in order to prevent local buckling of the upper and lower flange positions of the steel beams 20 in the closing plate 30.

In this embodiment, the closing plate 30 is a rectangular steel pipe and its upper and lower portions, and the upper and lower flanges 2 of the steel beam 20.
2 is formed by the outer side surfaces of the reinforcing frames 32A and 32B provided at the positions where they are connected. As shown in FIG. 1, the upper reinforcing frame 32 </ b> A includes a plurality of rectangular steel pipes 3 cut into a ring shape.
4, 34,... Are arranged side by side in a cross shape, and the outer peripheral surface of the closing plate 30 is formed by welding the four outer corners of the outer surface with a steel plate and welding. The lower reinforcing frame 32B is manufactured in the same manner as the reinforcing frame 32A.

The steel beam 20 made of H-shaped steel is joined to the outer peripheral surface of the closing plate 30 from all sides. In this embodiment, the upper and lower flanges 22 of the steel beam 20 are welded to the outer surfaces of the reinforcing frames 32A and 32B, respectively, and the web 24 is formed on a rectangular steel pipe sandwiched between the upper and lower reinforcing frames 32A and 32B via the gusset plate 26. Bolted.

The size and arrangement interval of the square steel pipe 34 are as follows.
It is determined by the size of the reinforced concrete columns 10 and the steel beams 20, and the interval and number of the main bars 12 of the columns. FIG.
In the embodiment shown in FIG. 3, a rectangular steel pipe 34 having substantially the same length as the width of the flange 22 of the steel beam 20 is used, whereas in the embodiment shown in FIG. 3, a rectangular steel pipe 34 having a rectangular cross section is used. I have.

FIG. 4 and FIG. 5 show that the rectangular steel pipe constituting the closing plate 30 also serves as the outer shell of the reinforcing frames 32A and 32B.
An example in which a small-diameter rectangular steel pipe 34 is arranged in a cross shape and fixed inside the rectangular steel pipe is shown. Each square steel pipe 34 is connected via an angle member 36.

In this embodiment, a reinforced concrete column 1
In order to join the steel beam 20 and the steel beam 20, a blocking plate 30 made of a square steel pipe and a steel plate to which the reinforcing frames 32A and 32B have been joined is manufactured in advance in a factory or the like, and the reinforced concrete column 10 is installed at a predetermined position. After placing on the capital,
The ends of the steel beams 20 may be moved from all sides and welded to the side surfaces of the closing plate 30. In the above embodiment, the steel beams 20 are directly joined to the closing plate 30, but they may be joined via a bracket of an appropriate shape (not shown).

After joining the steel beam 20 to the closing plate 30, concrete is poured into the panel zone. Since only the column main reinforcement 12 and the reinforcing frames 32A and 32B are provided in the panel zone, the concrete is smoothly filled.

In the joint structure between the reinforced concrete column and the steel beam, the stress of the joined steel beam 20 is reduced by the closing plate 30.
And the reinforcing frames 32A and 32B, and are reliably transmitted to the reinforced concrete column 10. In addition, the closing plate 30 appropriately restrains the concrete in the panel zone.

[0018]

According to the present invention, by employing the above-mentioned structure, the stress of the steel beam can be transmitted to the reinforced concrete column without fail, and the required strength can be secured at the joint.

Further, the present invention makes use of a ready-made square steel pipe or angle material to produce a joint at a low cost in a factory.
Can be processed. Furthermore, it is extremely excellent in workability at the time of erection, and has a remarkable effect such as significant labor saving of work and shortening of construction period.

[Brief description of the drawings]

FIG. 1 is a plan view of a joint between a reinforced concrete column and a steel beam.

FIG. 2 is a vertical sectional side view taken along line II-II of FIG.

FIG. 3 is a plan view of a reinforcing frame using a rectangular steel pipe having a rectangular cross section.

FIG. 4 is a plan view of a reinforcing frame using a square steel pipe and an angle material.

FIG. 5 is a plan view showing a modified example of a reinforcing frame using a square steel pipe and an angle material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reinforced concrete column 20 Steel beam 30 Blocking plate 32A, B Reinforcement frame 34 Square steel pipe 36 Angle material

Claims (1)

(57) [Scope of request for utility model registration] In a joint structure between a reinforced concrete column and a steel beam in which a joint between the reinforced concrete column and the steel beam is covered with a steel pipe or a steel plate, at a position corresponding to upper and lower flange positions of the steel beam inside the reinforced concrete column,
A joining structure, wherein a plurality of rectangular steel pipes cut into a ring shape on the steel pipe or the steel plate are fixed in a cross shape.