JPH0611291Y2 - Reinforcing structure of reinforced concrete columns - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reinforcing structure of a reinforced concrete column using a welding grid hoop and a cross joint metal fitting.

"Prior art" When assembling a reinforcing bar of a column of a reinforced concrete structure, a reinforcing bar basket is formed by a plurality of corner main bars at the four corners and in the middle and a large number of corner hoops. It is necessary to bind them to each other. For this binding, generally annealed iron wire or the like is used, and rarely, a binding metal (Japanese Utility Model Publication No. 54-12211 or the like) is used.

In addition, a core hoop (reinforcing bar) may be used inside the square hoop in order to increase the toughness of the column against axial force and shear strength.

"Problems to be solved by the invention" In recent years, reinforced concrete structures have also become high-rise,
Along with this, the rebar pre-assembly method has been widely adopted for rebar assembly, but in this case, the pre-assembly rebar unit assembled with annealed steel wire etc. is temporarily moved and erected due to the loose binding. ,
When hoisting, there is a drawback that deformation, member dropout, etc. are likely to occur and assembly accuracy is poor, and a large amount of reinforcing bundling is required to prevent deformation and member dropout and improve assembly accuracy.

Further, when the above-mentioned binding hardware is used, such problems are relatively small, but the straight reinforcing bars which are orthogonal to each other are engaged with each other in a hugging state and bolted, and specifically, both ends are hooked. A bolt is threaded through the middle part of the U-shaped metal object that forms a square shape, and at the orthogonal part between the pillar main bar and the straight part of the square hoop, it is hung from the inside on the column main bar and hooked at both ends. Since it is to engage with the square hoop and press the column main bar against the square hoop by tightening the bolt in the middle part, it can not be used for the column main bar at the four corners of the core at all, it can only be used for the intermediate column main bar In addition, this hinders the installation of the core hoop,
Furthermore, since it is necessary to hold the pillar main bar in a hugging manner, there is a dimensional limitation that fits the diameter of the column main bar, and if it is large, wobble occurs, and if it is small, it does not fit.

By the way, in assembling a reinforcing bar of a beam, there is a binding clip that binds the beam main bar and the stapler at the upper and lower corners. (Japanese Utility Model Publication No. 56-61519). The binding clip has clips at both ends of a binding piece which is an intermediate portion, and is entirely bent to correspond to the beam main bar, and the binding piece is abutted against the inside of the beam main bar at the upper corner, Fit the clip in the vicinity of the corner of the stirrup that bends at a right angle (on both sides of the beam main bar),
The main beam of the beam is pressed against the corner of the stirrup.

However, such a bundling clip is effective in assembling a reinforcing bar of a beam, and in the case of assembling a reinforcing bar of a column, it does not have sufficient holding force and cannot be used at all. Even if you try to increase the toughness of the column against axial force and shear strength by providing a core hoop inside the corner hoop and corner hoop, if the square hoop moves carelessly, the required toughness cannot be obtained, This results in poor quality.

Thus, such a conventional core hoop is not only difficult to construct and requires a great deal of work for assembling, but also secures high column toughness against high axial force and high shear strength of high-rise / high-rise buildings. Can not.

The present invention seeks to solve these problems.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention arranges a suitable number of column main bars A at the four corners and the middle, and a plurality of vertical bars Ba and a plurality of horizontal bars Bb are provided in these column main bars A. Incorporating a proper number of welding grid hoops B, which are welded and integrated by interposing, and the longitudinal stripes Ba of each welding grid hoop B,
At least two intersections where the crossing portion of the horizontal bar Bb and the column main bar A intersect at right angles, a vertical joint Ba, the horizontal bar Bb and the column main bar A are engaged and fastened with a cross joint hardware C, respectively, Joint hardware C has both ends 1 formed on the hook.
A and 1b are straddled over the main pillar A and the longitudinal bar Ba of the welding grid hoop B
And a cross bar Bb, each of which is provided with a cross-joint metal body 1 projecting at a right angle through a slight intermediate portion 1c so as to be engaged with each other, and a main pillar A which is formed by forming a screw hole in the intermediate portion 1c and straddles it.
It is characterized in that a bolt 2 for tightening is screwed through.

[Operation] The above-mentioned configuration, and the vertical bar Ba and the horizontal bar Bb of the welding grid hoop B
The cross joint metal fitting C, which is tightened by engaging between the vertical ribs Ba, the horizontal ribs Bb, and the column main bar A at at least two intersecting points where the crossing portion of the column main bar A crosses at right angles, Both ends 1a, 1b formed on the hook of the welding rod are straddled over a predetermined column main bar A so that the longitudinal bar Ba and the lateral bar of the welding grid hoop B
It engages with Bb, the bolt 2 of the intermediate portion 1c is tightened, and the column main bar A and the inner corner of the intersection of the vertical bar Ba and the horizontal bar Bb are pressure contacted,
Accordingly, the welding grid hoop B is accurately held at a predetermined position. Further, the welding grid hoop B held in such a position
Is firmly welded and integrated to eliminate structural instability elements in the hoop, properly restrain the column main reinforcement A, and the core concrete, and increase the toughness of the column against high axial force and high shear strength. Secure.

[Examples] The drawings show examples of the present invention.

In the figure, A is an appropriate number of column main bars properly arranged at the four corners and the middle, and B is a welding grid hoop that is orthogonally combined with these column main bars A, and has a plurality of vertical bars Ba and a plurality of horizontal bars Bb. Are integrated by welding. The welding grid hoop B
Are arranged in appropriate numbers with respect to the column main muscles A at appropriate intervals.

C is the intersection between the vertical bar Ba and the horizontal bar Bb of the welded grid hoop B and the outer two intersections where the column main bar A intersects at right angles. A cross-joined metal fitting that is tightened by tightening, a cross-joined hardware main body 1 made of a thick steel plate, a bolt 2 that is threaded through the middle portion of the cross-joint metal fitting, and a lock nut 3 that is screwed into the bolt. It consists of and.

The cross joint metal body 1 has a welding grid hoop B formed by straddling both ends 1a and 1b formed in a hook on a column main bar A.
A slight intermediate part to engage each of the vertical bar Ba and the horizontal bar Bb of
The bolt 2 is projecting at a right angle via 1c, and a screw hole is formed in the intermediate portion 1c to fasten it to the strut main bar A straddling the through hole. The ends 1a, 1b and the intermediate portion 1c are bent at 135 degrees.

[Advantage of Invention] According to the present invention, the vertical bar Ba, the horizontal bar Bb and the column main bar are provided at at least two intersections where the intersection of the vertical bar Ba and the horizontal bar Bb of the welding grid hoop B is orthogonal to the column main bar A. A cross joint metal piece C is engaged with and tightened with A, respectively, and the cross joint metal piece C has both ends 1a, 1 formed on the hook.
The cross joint metal body 1 is provided by projecting b at a right angle through a slight intermediate portion 1c so as to straddle the column main bar A and engage with the vertical bar Ba and the horizontal bar Bb of the welding grid hoop B, respectively.
Since the bolt 2 that forms a screw hole in the intermediate portion 1c and is fastened to the strut main bar A that is straddled, is threaded through, the both ends 1a and 1b formed on the hook in the cross joint metal body 1 are , The vertical bar Ba of the welding grid hoop B can be engaged with the vertical bar Ba and the horizontal bar Bb of the welding grid hoop B, and the vertical bar Ba of the column main bar A and the welding grid hoop B can be tightened by tightening the bolt 2. -The inner corner of the intersection of the horizontal streaks Bb can be pressed into contact with each other, and even with a small number of the cross joint hardware C, each welding grid hoop B can be accurately held at a predetermined position, and the small number can be reduced and workability is improved. Can be improved. Further, a strong binding can be obtained also in the pre-assembled rebar unit, and even when the pre-assembled rebar unit is temporarily moved, erected and hoisted, the assembly precision can be ensured without causing deformation or member dropping.

Further, by using such a cross joint hardware C, the welding grid hoop B is pressed against the column main bar A at the inner corner of the intersection of the vertical bar Ba and the horizontal bar Bb to secure the position. Does not require a strict dimensional restriction adapted to the diameter of the column main bar, and it is possible to eliminate the inconvenience of causing a large wobble or a small wobbling. Therefore, the cross joint hardware C can ensure dimensional flexibility that can be widely used for various reinforcing bars having different diameters, which is convenient for use. Of course, since the welding grid hoop B is used, the cross joint hardware C can be used for any of the column main bars A at the four corners of the core and the column main bars A in the middle without any trouble.

Since the welding grid hoop B is firmly welded and integrated to eliminate structural instability elements in the hoop, it is held in the proper position as described above, so that the column main bar A
The core concrete can be properly restrained, and even if it is used in high-rise or super-high-rise reinforced concrete buildings, the high toughness of the column against high axial force and high shear strength is secured, and the quality of the building is improved. be able to.

In addition, when forming the pre-assembled rebar unit, the rigidity of the unit is increased, so it is possible to improve safety even at high lifts, standardize the rebar pre-assembly, and reduce building costs. .

In addition, the cross joint hardware C
It can also be used for connecting pipes for temporary scaffolding.

[Brief description of drawings]

1 is a plan view showing a state of use, FIG. 2 is an enlarged view of the same, and FIG. 3 is a perspective view. A: Column main bar, B: Welding grid hoop C: Cross joint hardware 1 ... Cross joint hardware body 2 ... Bolt, 3 ... Lock nut

Front page continuation (72) Inventor Soichi Kitani, 8-21-1, Ginza, Chuo-ku, Tokyo Inside the Takenaka Corporation Tokyo branch (56) References: 54-12211

Claims (1)

[Scope of utility model registration request] 1. A suitable number of welding grids in which a suitable number of column main bars A between the four corners and the middle are arranged, and a plurality of vertical bars Ba and a plurality of horizontal bars Bb are crossed with these column main bars A and welded together. Incorporating the hoop B, at the at least two intersections at which the intersection of the vertical bar Ba and the horizontal bar Bb of each welding grid hoop B and the column main bar A intersect at right angles, the vertical bar B
a, a cross joint metal fitting C is engaged and tightened between the horizontal bar Bb and the column main bar A respectively, and the cross joint metal piece C connects the both ends 1a and 1b formed on the hook to the column main bar A
The cross joint metal body 1 is provided by projecting at a right angle through a slight intermediate portion 1c so as to engage with the vertical bar Ba and the horizontal bar Bb of the welding grid hoop B by straddling each other, and a screw is provided on the intermediate part 1c. A reinforced concrete column arranging structure in which a bolt 2 for tightening to a column main bar A which forms a hole and is straddled is screwed through.