JP2519727Y2 - Column-beam joint structure of reinforced concrete structures - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention mainly relates to a column-beam joint structure of a reinforced concrete structure using high-strength concrete and high-strength reinforcing bars.

[Conventional technology]

In general, in a building with reinforced concrete structure, when high-strength reinforcing bars (SD60 or more) and high-strength concrete (Fc = 600 kg / cm ² or more) are used as reinforcing bars and concrete, the strength is higher than when ordinary reinforcing bars and concrete are used. Although it is remarkably improved, the member stress is increased as a whole, and considerably large stress is generated particularly at the joint between the column and the beam. For this reason, since the covering of the reinforcing bar cannot be sufficiently secured with a normal cross-sectional size, the fixation of the main reinforcing bar end is insufficient.

This is the same for the column-beam joints, and the load-deformation curve of this part shows so-called slip type structural performance,
The main beam of the beam may come out.

For this reason, when using high-strength concrete in a building with a reinforced concrete structure, it is necessary to increase the column diameter considerably in order to ensure sufficient coverage of the reinforcing bars at the column-beam joints. Not only is it considerably narrowed down by structures such as beams, but the amount of concrete used is also increased due to the additional cross-section of the members, and it is often the case that the advantages of using high-strength concrete cannot be fully exerted.

This invention was made in order to solve the above problems, and the pillars of reinforced concrete structures were designed to maximize the benefits of using high-strength concrete.
An object is to provide a beam joint structure.

[Means for solving the problem]

The column-beam joint structure of a reinforced concrete structure according to the present invention includes a hoop portion formed in a ring shape having a diameter smaller than the outer diameter of the column in concrete of a joint between a column and a beam of a reinforced concrete structure. It is formed to have a cross shape inside the hoop portion and has a plurality of reinforcing web portions fixed to the inner portion of the hoop portion, and the beam main bar of the beam is formed as described above. A fixing metal fitting that is fixed to the joint between the column and the beam is installed, and a plurality of notches through which the beam main bar penetrates are formed in the front of the hoop, and the outside or inside of this notch, or outside and inside A plurality of fixing nuts with openings for fixing the beam main bars to the fixing fittings are fixed to both sides by being screwed and attached to the beam main bars from the side.

〔Example〕

Hereinafter, the pillar of the reinforced concrete structure according to the present invention
The beam joint structure will be described with reference to an embodiment shown in the drawings.

At the joint between the column 1 and the beam 2 of the reinforced concrete structure, a plurality of upper and lower beam main bars 3 arranged in the concrete of the beam 2,
Corresponding to the position where 3 penetrates, these upper and lower beam main bars 3, 3 are used for pillar 1
Fixing metal fittings 4, 4 fixed to the joint between the beam 2 and the beam 2 are horizontally embedded.

The fixing metal fitting 4 is arranged in a quadrangular ring shape having a smaller diameter than the outer diameter of the pillar 1 and a hoop portion 4a which is arranged inside the hoop portion 4a in a cross shape and fixed to the inner portion of the hoop portion 4a. And a plurality of reinforcing web portions 5 thus formed (see FIGS. 1, 2, 3, 8 and 9).

In the hoop portion 4a, a plurality of through holes 6 through which the beam main bars 3 can be penetrated from the side are formed at regular intervals in the lateral direction, and the through holes 6 are provided inside or outside, or on both sides of the inside and the outside. A plurality of fixing nuts 7 screwed to the beam main bars 3
Are attached by welding.

The upper and lower beam main bars 3, 3 penetrate the through hole 6 of the fixing fitting 4 at the joint between the pillar 1 and the beam 2, and the fixing nut 7
It is fixed to the fixing fitting 4 by screwing with.

Further, instead of the through hole 6, a notch 8 that can be installed in a state of penetrating the beam main bar 3 from the side is formed in the hoop portion 4a of the fixing metal fitting 4, and the inside or outside of each notch 8 or the inside thereof. Instead of the fixing nut 7 on both sides, and by attaching fixing nuts 9 with openings having openings so that the beam main bars 3 can be screwed from the side (see FIGS. 7 and 9), the beam main bars 3 It is possible to easily install the fixing metal fitting 4 even after arranging 3 and 3.

With such a structure, the beam main bars 3 and 3 of the beam 2 are firmly and firmly fixed to the joint between the column 1 and the beam 2, so that the column 1 and the beam 2 are firmly joined.

[Effect of device]

The column-beam joint structure of a reinforced concrete structure according to the present invention has the configuration described above, and in particular, a joint metal fitting embedded for joining columns and beams in concrete at the joints between columns and beams is used. A hoop portion formed along the outer shape of the pillar in a ring shape having a diameter smaller than the outer diameter of the pillar, and a plurality of hoop portions arranged inside the hoop portion in a cross shape and fixed to the hoop portion. Since it is formed with the reinforcing web part, it is not easily deformed, and the beam main bar can be firmly and firmly fixed to the joint between the column and the beam by an extremely simple method. Therefore, there is an effect that the column and the beam can be firmly joined.

Further, a plurality of cutouts through which the beam main bar penetrates are formed in the hoop portion of the fixing metal fitting, and the notch is screwed from the side to the beam main bar on the outside or inside, or both outside and inside. Since a plurality of fixing nuts with openings for fixing the beam main bar to the fixing bracket are fixed, the beam main bar is opened especially when the beam main bar is arranged at the joint between the column and the beam. The fixing nut with a beam can be attached to the fixing bracket by screwing from the side of the fixing nut with an opening without intentionally screwing it from the end. Therefore, the reinforcement and fixing of the beam main bar can be secured and secured with an extremely simple method. There is an effect that can be done.

Therefore, even when using high-strength concrete, it is not necessary to intentionally increase the member cross sections of columns and beams, and the advantages of high-strength concrete can be maximized and material costs can be saved.

[Brief description of drawings]

1 to 7 show an embodiment of a column-beam joint structure of a reinforced concrete structure according to the present invention, and FIGS. 1 to 4 are cross-sections of a column-beam joint part of a reinforced concrete structure. 5 and 5 are longitudinal sectional views thereof, and FIGS. 6, 7, 8, and 9 are perspective views of the fixing fitting. 1 ... Pillar, 2 ... Beam, 3 ... Upper and lower beam main bars, 4 ... Fixing metal fitting, 5 ... Web part, 6 ... Through hole, 7 ... Fixing nut, 8 ... Notch, 9 ... Fixing nut with opening.

Claims (1)

(57) [Scope of utility model registration request] 1. A hoop portion formed in a ring shape having a diameter smaller than the outer diameter of the column in the concrete at the joint between the column and the beam of a reinforced concrete structure, and a cross shape crossing inside the hoop portion. A fixing member that is arranged and formed to have a plurality of reinforcing web portions that are fixed to the inner portion of the hoop portion, and that fixes the beam main bar of the beam to the joint between the column and the beam. A metal fitting is installed to form a plurality of notches in the hoop portion through which the beam main bar penetrates, and the beam main bar is screwed to the outside or inside of the notch or both outside and inside of the notch. A column-beam joint structure of a reinforced concrete structure, wherein the column-beam joint portion of a reinforced concrete structure is fitted together, and a plurality of fixing nuts with openings for fixing the beam main bar to the fixing metal fitting are fixed.