JP2584844Y2 - Reinforced concrete columns using flat steel lattice hoops - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete column using a lattice hoop made of flat steel used for a reinforced concrete high-rise building or the like.

[0002]

2. Description of the Related Art Heretofore, a reinforced concrete column 10 (see FIG. 4) used in a reinforced concrete building uses a reinforced hoop 11 to increase the shear strength of the column. Further, a reinforced concrete column is known in which a square tubular steel plate surrounding the outer periphery of a main reinforcing bar at a column head or a column base and having a cross-shaped internal partition fixed inside is attached to an outer peripheral portion of the column main reinforcing bar. (Actual opening 61-133
620).

[0003]

[Problems to be solved by the invention] In order to construct a super high-rise apartment building with reinforced concrete, it is necessary to increase the strength of reinforced concrete columns (especially against axial force) with the increase in the height of the building. The pillar 10 uses a reinforcing bar hoop 11. However, the reinforcing bar hoop 11 has a small diameter of the reinforcing bars, and therefore a large interval between the reinforcing bars. Therefore, the high axial force (arrow P) and the bending (arrow M) shown in FIG. Then, as shown in FIG. 4 (A), the concrete 13 outside the portion where the hoop 11 is applied peels off 14, and as shown in FIG.
1 and 11, a buckling 16 occurs in the main bar 15 of the column, and then an excessive tensile force is generated in the hoop 11, so that FIG.
As shown in (C), the hoop 11 breaks 17 and the main reinforcement 15
However, there was a drawback in that large buckling 18 occurred, and a failure such as a decrease in proof stress leading to breakage of the column occurred, making it difficult to achieve a super-high rise due to reinforced concrete construction. In addition, the actual opening 61-13
No. 3620 discloses a structure in which a cross-shaped internal partition is fixed inside a square tubular steel plate surrounding the outer periphery of a main reinforcing bar of a column. It is necessary to form the internal partition into a series of a plurality of crosses, which requires very troublesome processing such as welding a large number of thinly cut steel sheets one by one. Not only the four main reinforcing bars at the four corners are in contact with the square cylindrical steel plate on the two outer surfaces, but the middle eight main reinforcing bars are only in contact with the square cylindrical steel plate on one surface. When a high axial force or a high bending moment acts on the main reinforcement of the column, the main reinforcement is likely to move, so that there is a defect that the concrete peels off and the main reinforcement tends to buckle.

[0004] This invention solves the above-mentioned disadvantages and does not cause buckling of the main reinforcement of the column despite the fact that it is made of reinforced concrete. The number of partition steel plates equal to the number of main reinforcements can be assembled by simple operation so as to be in contact with the outer two surfaces of each main reinforcement, so that the main reinforcements can move even when high axial force or high bending moment acts. Without
It is an object of the present invention to make it possible to construct a tough high-rise building in which concrete peels off and buckling of main bars does not occur.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a reinforced concrete column having a rectangular cross section.
A main bar on one side of the square of the column on the head or column base
Perpendicular to the one surface provided with the same number of grooves opening upward
And flat bars as many horizontal main reinforcement that is in a plane, the number of main reinforcement in the said one surface provided with the same number of grooves opened downward of the main reinforcement in the plane perpendicular to the said one face Equal amount of water
A flat direction of the flat bar, and a lattice-shaped hoop in combination an open groove in the opening grooves and downwardly thereover, reinforced concrete columns provided in contact with the hoop 2 side of the outside of each main reinforcement of the pillar The means of taking.

[0006]

An embodiment of the present invention will be described with reference to the drawings. 1 and 2, a reinforced concrete column 1 before casting concrete is represented by an imaginary line, and a cross section of the column base 2 or a column cap (not shown) is formed .
The column (1) is located at a position in contact with the outer periphery of the main reinforcing bar 3 inserted in the longitudinal direction of the shaped reinforced concrete column 1 so as to surround the main reinforcing bar 3.
Upwardly opening grooves 7 provided with the main reinforcement 3 in the plane perpendicular to the one surface the same number of main reinforcement 3 in the one surface within the square
Flat bar 4 of the same number in the horizontal direction (see FIG. 3), the one surface
The same number of water as the number of the main reinforcements 3 in the one plane provided with the same number of the downwardly-opened grooves 7 as the number of the main reinforcements 3 in the plane orthogonal to
A grid 5 combining flat steel 4 in the horizontal direction with grooves 7 above and below it
A hoop 6 is provided. The width of flat steel 4 is 10cm ~
Those having a wide width of about 20 cm can be used. FIG.
, Four assembling pieces 8 of the hoop 6 in which four grooves 7 having a depth of up to half of the flat steel 4 have been cut are orthogonally arranged horizontally, and each assembling piece 8
The grooves 5 are inserted into each other to form the lattice 5. The intersections 9 of the assembled grooves 7 are usually subjected to fillet welding, but welding is not necessary with a tightly assembled grid.

[0007]

According to the present invention, a conventional hoop is made up of a pillar and a cylindrical steel plate having a reinforcing bar or a cross-shaped partition.
Since the same number of flat bars as the number of main bars in the plane and the plane perpendicular to the plane are used, and they are assembled in a lattice, (1) the hoop is easy to assemble, and the attachment to the main bars is easy and reliable. (2) since Crossed the main reinforcement and the same number of flat bars in a grid,
Even if the number of main bars is large, a hoop with a large number of internal partition plates inserted can be used accordingly. (3) The pillar core has a large restraining effect on concrete and can prevent concrete from overflowing. 4) Since the main reinforcement is almost continuously restrained except for the gap of the flat steel, buckling hardly occurs due to increase in edge stress due to high axial force and high bending moment, toughness is improved, and (5) high rigidity Lattice hoops are attached in contact with the outer two surfaces of all main bars, so the main bars are difficult to move even when high axial force or high bending moment is applied, so concrete peels and buckling of the main bars does not occur It is possible to build a tough high-rise building,
(6) Since the reinforcing bars are fixed by the high-rigidity grid hoops, they are suitable for the so-called pre-assembled rebar construction method in which the main reinforcing bars are placed on the ground before the rebars are assembled at the site, and the construction period is shortened. be able to.

[Brief description of the drawings]

FIG. 1 is a front view mainly showing a relationship between a main bar and a hoop showing one embodiment of the present invention.

FIG. 2 is a plan view cut along the line AA of FIG. 1;

FIG. 3 is a perspective view showing an assembly piece of a hoop.

4 (A), (B) and (C) are cutaway front views showing a buckling situation of a reinforced concrete column, respectively, showing a conventional example.

[Description of Signs] 2 Column head or column base 3 Main bar 4 Flat bar 5 Grid 6 Hoop 7 Groove

──────────────────────────────────────────────────続 き Continuing from the front page (72) Masayuki Yamamoto 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Masayuki Iwata 8-2-1-1, Ginza, Chuo-ku, Tokyo No. Takenaka Corporation Tokyo Main Store (72) Koji Murata Inventor 8-2-1 Ginza, Chuo-ku, Tokyo Inside Tokyo Headquarters (72) Inventor Toshio Nagashima 2-5 Minamisuna, Koto-ku, Tokyo No. 14 Takenaka Corporation Technical Research Institute (56) References Japanese Utility Model Sho 61-133620 (JP, U) Japanese Patent Publication 55-36434 (JP, B2) Japanese Patent Publication 44-3017 (JP, B1) 52-36434 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04C 3/34 E04C 5/18 105

Claims (1)

(57) [Scope of request for utility model registration] 1. A reinforced concrete column (1) having a rectangular cross section .
Place one of the squares of the column (1) on the column cap or column base (2).
In the plane main reinforcement (3) main reinforcement (3) as many horizontal flat bar of the same number of upper in the open grooves (7) perpendicular to the plane with the one surface provided with the (4) And the one side
The number of the main reinforcing bars (3) in the plane orthogonal to the number of the main reinforcing bars (3) in the plane provided with the same number of grooves (7) opened downward .
The same number of horizontal flat bars (4) are combined with grooves (7) opened upward and grooves (7) opened downward to form a grid (5) -shaped hoop (6). (6) A reinforced concrete column provided so as to be in contact with two outer surfaces of each main bar (3) of the column (1).