JPH0469689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a joint structure between reinforced concrete beams and columns for, for example, high-rise reinforced concrete buildings.

<Prior Art> Conventionally, the structure shown in FIGS. 3 and 4 is known as a reinforced concrete column-beam joint structure. In this figure, 1 is a cylindrical column formwork, 3 and 5 are beam forms with a U-shaped cross section extending laterally at right angles to each other,
A plurality of column reinforcements 2 are assembled on the inner periphery of the column formwork 1 at regular intervals in the circumferential direction, and are fixed to hoop reinforcements 4 on the outside. Furthermore, as shown in FIG. 4, each of the beam formworks 3 and 5 has a plurality of main beam reinforcements 6, 6, . . . , 8, 8, . are assembled horizontally so as to be parallel to each other and fixed to the beam hoop reinforcements 9. Then, at the column-beam joint J', the beam main reinforcements 6, 6, ... and the beam main reinforcements 8, 8,
. . . pass through between the columnar reinforcements 2, 2, . . . and are orthogonal to each other in a grid pattern.

<Problems to be solved by the invention> However, in the above-mentioned conventional column-beam joint structure,
As mentioned above, at the column-beam joint J', the horizontal
Since the main beam reinforcements 6 and 8 intersect in a checkerboard pattern, the gap between the main beam reinforcements becomes small, and when concrete is poured into the column formwork 1, the hose for concrete pouring is used. The tip of the concrete cannot be inserted all the way to the bottom of the column, and the concrete will fall from a high place, causing the concrete aggregate and cement to separate, resulting in a decline in quality.

In addition, the beam main reinforcements 6, which are made of concrete made by uniformly mixing cement and aggregate and made into a fluidized block, are arranged in a checkerboard pattern at the column-beam joint J'.
If you try to pour concrete through the gap shown in Figure 8, even if the gap is larger than gravel or other coarse aggregate, it will be difficult for concrete in the form of a lump to pass through.
The passing speed is also extremely slow. Furthermore, the coarse aggregate may form bridges and close the gaps, making it impossible for concrete to pass through the gaps. Therefore, before assembling the main beam reinforcements 6 and 8, concrete is first poured into the column formwork 1 up to the height of the bottom surfaces 3a and 5a of the beam forms 3 and 5, and then As mentioned above, it is necessary to assemble on the bottom surfaces 3a, 5a side and the beam top 7 side, and then pour concrete on the beams and slabs (not shown), which complicates the process and causes problems such as inefficiency and poor workability. be.

Therefore, the purpose of this invention is to solve the above problems and provide a reinforced concrete column-beam joint structure that allows concrete to be poured between columns and beams reliably, easily, and efficiently without degrading the quality of the concrete. It is about providing.

<Means for Solving the Problems> In order to achieve the above object, the first invention provides horizontal reinforcing bars that pass through the joint between a reinforced concrete column and a beam so as to form a cavity in the center of the column. It is characterized by forming a bent part bent outward in the direction.

Moreover, the second invention forms a bent part bent outward in the horizontal direction so as to form a cavity in the center of the column in the main beam reinforcement that penetrates the joint between the reinforced concrete column and the beam, and the main beam reinforcement It is characterized by having a hoop muscle on the outside of the bent part.

<Function> In the first invention, when concrete is poured from above the column, the tip of the hose for concrete pouring is caused by the cavity in the center of the column formed by the outwardly bent part of the beam main reinforcement. The column can be inserted all the way to the bottom, and concrete can be dropped in chunks from an appropriate height, so the concrete aggregate and cement do not separate and high-quality concrete is poured. be done. In addition, even when a hose is not inserted, the above-mentioned cavity allows the concrete in the form of a lump to smoothly pass through the column-beam joint and flow down the column, allowing concrete to be poured over the entire column, and also between the beam and the beam. Concrete will also be poured into the slab at the same time. Note that by forming a cavity in the center of the column, the spacing between the main beam reinforcements on the outer periphery becomes narrower, but this part only needs to have a gap that can be filled with concrete material, and the concrete of the column can be poured smoothly. There is no need for wide gaps where water can flow. Moreover, when filling the above-mentioned gap with concrete, the falling speed may be slow. In addition, at the column-beam joint, the attachment length between the concrete and the beam main reinforcement increases by the bending of the beam main reinforcement, and the pull-out resistance of the beam main reinforcement increases.

In the second invention, similar to the first invention, concrete is placed simultaneously on columns, beams, and slabs. In addition, the bent section is restrained by the hoop reinforcement attached to the outside of the bent section of the beam main reinforcement, and the concrete outside the bent section is restrained. Peeling is prevented.

<Examples> Hereinafter, the present invention will be explained in detail with reference to illustrated examples.

FIG. 1 is a horizontal sectional view showing the reinforced concrete column-beam joint structure of the present invention, in which 1 is a cylindrical column formwork;
Reference numeral 2 denotes column reinforcements provided on the inner periphery of the column form 1 at regular intervals in the circumferential direction, and 3 and 5 are beam forms having a U-shaped cross section and extending horizontally at right angles to each other.
On the outside of the column reinforcements 2, 2, . . . , as shown in FIG. 21 is wound spirally, and the hoop reinforcements 20, 21 are fixed to the columnar reinforcements 2, 2, . . . by binding reinforcements or welding (not shown).

Further, as shown in FIG. 2, 16 and 18 are assembled horizontally on the bottom surfaces 3a and 5a sides of the beam forms 3 and 5 and on the beam top 7 side, and the column reinforcements 2, 2, . . .
This is the main beam reinforcement that passes through the column-beam joint J through ... The beam main reinforcing bars 16 and 18 assembled in the two upper and lower locations within the beam forms 3 and 5 are each fixed to the beam hoop reinforcing bars 19 by binding bars or welding (not shown).

As shown in FIG. 1, the beam main reinforcement 16 is formed with a bent portion 16a that is bent in an arc shape toward the beam form 5 side, that is, to the outside, at the column-beam joint J.
Similarly, the beam main reinforcement 18 is formed with a bent portion 18a that is bent outward in an arc shape at the column-beam joint J. Then, a substantially circular opening H is formed by the bent portions 16a and 18a, and the column form frame 1 is
It forms a cavity in the center. The above bent part 1
Hoop reinforcements 22 are attached to the outer sides of 6a and 18a via the columnar reinforcements 2. This hoop muscle 22
is in contact with the upper side of the beam main reinforcement 18 and the lower side of the beam main reinforcement 16, and is wound twice.

In the above configuration, when pouring concrete into the column formwork 1, insert the tip of the concrete pouring hose through the opening H to the bottom of the column to prevent separation of concrete aggregate and cement. Drop concrete from an appropriate height. Therefore, high quality concrete can be placed. In addition, when pouring concrete near the column-beam joint J, if a lump of concrete is poured into the column form 1 from above the column-beam frame 1,
Bent parts 16a and 18a formed at the column-beam joint J
Since a cavity is formed in the center of the column formwork 1, the concrete easily passes through the column-beam joint J and smoothly falls downward. Therefore, unlike in the past, concrete can be poured into the column formwork 1 with the beam main reinforcements still assembled, and concrete can be poured all at once to the tops of the beams and slabs at the same time. can. Therefore, the process becomes simple and concrete placement work can be carried out efficiently.

Furthermore, the adhesion length of concrete at the column-beam joint J becomes longer by the bending of the beam main reinforcements 16 and 18, and the adhesion force between the concrete and the beam main reinforcements can be increased. In other words, it is possible to prevent slipping of the main beam reinforcement at the column-beam joint J, and it is possible to improve seismic performance.

For example, for the beam main reinforcement 16, the first
Assuming that a tensile force acts in the direction indicated by the arrow in the figure, as the main beam reinforcement 16 moves,
The concrete C on the outside of the bend 16a tends to peel off as it is pressed by the arc-shaped bend 16a, but the hoop reinforcements 22 attached to the outside of the bend 16a via the column reinforcements 2 prevent the concrete from bending. Part 16a,
16a, 18a, and 18a are restrained, and the concrete outside the bent portion 16a is restrained, so that the concrete C outside the bent portion 16a is prevented from peeling off.

In the above embodiment, the hoop reinforcement 22 is a round bar, but it may also be a square bar or a steel band.

<Effects of the Invention> As is clear from the above description, according to the first invention, the beam main reinforcement that penetrates the joint between a reinforced concrete column and a beam is horizontally aligned so as to form a cavity in the center of the column. Since a bent part is formed that bends outward, concrete can be poured onto the column with the main beam reinforcement still in place, and the concrete can be poured into the beam and slab at once, so the process of pouring work is simplified. It becomes easier and work efficiency is greatly improved. In addition, the tip of the concrete pouring hose can be inserted all the way to the bottom of the column and the concrete can be dropped from an appropriate height, preventing separation of concrete aggregate and cement, resulting in high-quality concrete. You can get concrete columns. Furthermore,
As the beam main reinforcement is bent, the length of the beam main reinforcement attached to the concrete becomes longer, and the adhesion force between the two increases significantly, improving seismic performance.

Further, according to the second invention, since the hoop reinforcement is provided outside the bent part of the main beam reinforcement, the bent part in the column-beam joint is restrained, and the concrete outside the bent part is restrained, so that the main beam reinforcement Even if a tensile force is applied to the concrete, peeling of the concrete outside the bend can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a horizontal sectional view of one embodiment of the present invention, and FIG.
1, FIG. 3 is a horizontal sectional view of the conventional example, and FIG. 4 is a sectional view taken along the line -- in FIG. 3. 1... Column formwork, 2... Column reinforcement, 3, 5... Beam formwork, 6, 8, 16, 18... Beam main reinforcement, 19, 2
0, 21, 22... Hoop reinforcement, J, J'... Column beam joint.

Claims (1)

[Scope of Claims] 1. Reinforced concrete characterized in that a beam main reinforcement that passes through the joint between a reinforced concrete column and a beam is provided with a bent part that is bent horizontally outward so as to form a cavity in the center of the column. Column-beam joint structure. 2 A bent part is formed in the main beam reinforcement that passes through the joint between the reinforced concrete column and the beam, and a bent part is bent horizontally outward so as to form a cavity in the center of the column, and a hoop is placed outside the bent part of the main beam reinforcement. A reinforced concrete column-beam joint structure characterized by the provision of reinforcement.