JP2570978Y2 - 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 joint 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 and the steel plate is resistant to shearing. There is a problem that the work of processing the steel plate becomes complicated, for example, by protruding.

As a joint structure between a reinforced concrete column and a steel beam having a simple structure, Japanese Patent Laid-Open Publication No. 1-121425 discloses a structure in which a steel pipe extending in the axial direction of a column is disposed at the center of a panel zone. I have. This joint structure also covers the joint with a steel pipe or a steel plate that also serves as a concrete casting form in order to protect the joint from bearing damage and increase rigidity.

Although the above-described joint structure is described as a simple structure that does not require assembling in a factory, since a closing plate for covering the outer peripheral portion of the joint and an internal steel pipe are provided side by side, the joint metal fitting is not provided. Due to the increase in weight, there is still room for improvement in workability at the site.

[0007]

[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 that can secure required strength and that can be easily prefabricated and has good workability during construction.

[0008]

The present invention relates to a reinforced concrete column and a steel frame in which a square steel pipe is provided at the center of the joint between the reinforced concrete column and the steel beam, and the steel beam or the beam bracket is welded to the outer peripheral corner of the steel pipe. A beam joint structure, wherein the length of one side of the steel pipe section is 1 to 1 of the length of one side of the column section.
And 2 ^-1/2 times, around the steel pipe, is characterized in that by winding the band plate or hoop by through welding or the portion in the corner portion of the steel pipe.

[0009]

In the above joint structure, the stress of the joined steel beam is reliably transmitted to the reinforced concrete column via the square steel pipe. Also, the band plate or hoop reinforces the concrete in the panel zone and resists shear forces in the panel zone.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a joint hardware 10 used for joining a reinforced concrete column and a steel beam via a beam bracket.
2 and FIG. 3 are perspective views of the metal joint 10.
It is a side view and a top view of a joint structure of a reinforced concrete column and a steel beam by using.

As shown in FIG. 1, a metal joint 10 is formed by welding an H-shaped steel serving as a bracket 6 to a corner of an outer peripheral surface of a square steel pipe 12. The size of the rectangular steel pipe 12 is such that the maximum length of one side in the cross section is about the length of one side in the cross section of the reinforced concrete column 2, and the minimum length of the diagonal line in the cross section of the steel pipe 12 is Is suitably within a range that is approximately equal to the length of one side.

If the length of one side of the steel pipe 12 is shorter than the minimum length, the bracket 6 may enter the reinforced concrete column 2 deeply, causing the column 2 to break down. On the other hand, when the length of one side of the steel pipe 12 exceeds the maximum length, not only does the weight of the joint metal 10 increase, but also the steel pipe 12 protrudes more than the reinforced concrete column 2, so that the stress of the bracket 6 is applied to the column 2. This is because it is unclear whether it can be transmitted reliably.

The axial length (height) of the steel pipe 12 is
In order to ensure the transmission of stress between the beams, it is the same as or slightly longer than the beam of the bracket 6. The square steel pipe 12 may be formed by welding a steel plate.

Around the steel pipe 12, a band plate 14 is provided.
Is wound in multiple stages and welded, so that when the reinforced concrete column 2 and the steel beam 4 are joined, the band plate 14 is arranged along the inner peripheral surface of the column 2.

In order to assemble the reinforced concrete column 2 and the steel beam 4 using the above-mentioned joint metal 10, the joint metal 10 manufactured in advance in a factory or the like is carried into the site and placed on the column head of the reinforced concrete column 2. Then, the steel beam 4 and the bracket 6 are joined by moving the steel beam 4 from all sides. The joining method may be either bolt joining or welding.

After the joining, concrete is poured into the panel zone. Inside the panel zone, a square steel pipe 1
2. Since only the band plate 14 and the main column bar 8 are provided, the concrete is smoothly filled. In addition, according to the present invention, since the members are not concentrated in the panel zone, there is almost no restriction on the number, the diameter, and the arrangement of the column main reinforcements 8.

When the column 2 is made of a full PC material, a reinforced concrete column 2 in which the column 2 and the joint hardware 10 are integrally cast with concrete is manufactured in a factory, and this is erected at the site and joined to the steel beam 4. .

FIG. 4 shows a plan view of a joint structure between the reinforced concrete column 2 and the steel beam 4 when the bracket 6 is not used. In this embodiment, the length of one side in the cross section of the rectangular steel pipe 12 is set to be equal to the length of one side in the cross section of the reinforced concrete column 2.
The steel pipe 12 was wound around the steel pipe 12 in multiple stages, using a hoop bar 16 instead of 4.

In the joint structure between the reinforced concrete column 2 and the steel beam 4, the stress of the joined steel beam 4 is reliably transmitted to the reinforced concrete column 2 via the square steel pipe 12. In addition, the band plate 14 or the hoop streaks 16
It constrains the concrete in the panel zone and resists shear forces in the panel zone.

That is, the tensile and compressive forces at the beam end caused by the bending moment of the steel beam 4 are transmitted to the column / beam joint via the bracket 6 and are resisted by the square steel pipe 12. At this time, with respect to the shearing force generated in the panel zone, the shear resistance of the band plate 14 and the hoop streaks 16 in addition to the steel pipe 12 can be expected.

In the present invention, as shown in FIG.
A horizontal diaphragm 20 in which a central hole 20a for placing concrete and a small hole 20b for inserting the column main bar 8 are formed at the upper end and lower end of the rectangular steel pipe 12 so as to cover the same. May be provided to reinforce the rectangular steel pipe 12.

[0022]

[Effects of the Invention] The joint structure between a reinforced concrete column and a steel beam according to the present invention has good mechanical properties, and can surely transmit the stress of the steel beam to the reinforced concrete column, and secure the required strength at the joint. Can be.

Further, according to the present invention, by adopting a simple structure in which a rectangular steel pipe having a predetermined size is disposed in the panel zone, the joint can be manufactured and processed at a factory at low cost. Further, since the weight of the metal joint is light, the workability at the time of erecting is extremely excellent, and a remarkable effect is exhibited, such as significant labor saving and shortening of the construction period.

[Brief description of the drawings]

FIG. 1 is a perspective view of a metal joint.

FIG. 2 is a side view showing an example of a joint structure between a reinforced concrete column and a steel beam.

FIG. 3 is a plan view of the bonding structure according to the first embodiment;

FIG. 4 is a plan view showing a modified example of a joint structure between a reinforced concrete column and a steel beam.

FIG. 5 is a plan view showing a joint structure of a column and a beam provided with a horizontal diaphragm.

[Explanation of symbols]

 2 Reinforced concrete column 4 Steel beam 6 Beam bracket 10 Joint hardware 12 Square steel pipe 14 Band plate 16 Hoop bar 20 Horizontal diaphragm

Continuing on the front page (72) Inventor Takaaki Miyahara 2-1 Tsukudocho, Shinjuku-ku, Tokyo Co., Ltd. Kumagaya Gumi Tokyo Head Office (72) Inventor Takeshi Tsuji 2-1 Tsukudocho, Shinjuku-ku, Tokyo Co., Ltd. Kumagaya Gumi Tokyo Head Office

Claims (1)

(57) [Scope of request for utility model registration] 1. A joint structure between a reinforced concrete column and a steel beam formed by arranging a square steel pipe at the center of the joint between the reinforced concrete column and the steel beam, and welding the steel beam or the beam bracket to a corner of an outer peripheral surface of the steel tube. The length of one side of the cross section of the steel pipe is set to 1-2-1 ^{/ 2} times the length of one side of the cross section of the column, and the periphery of the steel pipe is welded to a corner of the steel pipe or is welded to the corner. A band plate or a hoop streak wound around the portion.