JP2849262B2 - Tightening structure of reinforcing bars in reinforcing bars - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a stacked storage of reinforced cages,
The present invention relates to a portion where reinforcement between reinforcing bars is desired to be strengthened for carrying and lifting, and a reinforcing structure of reinforcing bars in a reinforcing bar pre-assembly used in some cases.

[0002]

2. Description of the Related Art Conventionally, a reinforcing steel bar of reinforced concrete is usually attached with an iron rod having a diameter of about 0.8 mm and assembled. However, the bond strength was weak, and this was not enough in the first group.

[0003] Therefore, in the case of the pre-assembly, when particularly strong binding is required for stacking, transporting, lifting, etc. of the reinforcing bar, an iron wire having a diameter of about 2 mm to 3 mm is wound and fixed a plurality of times. In some cases, the reinforcing bars were directly fixed by arc welding.

[0004]

However, the above-mentioned conventional binding has various problems as follows.

(1) An iron wire having a diameter of about 3 mm does not fit well with a reinforcing bar, and cannot be uniformly tightened in a plurality of turns, has low reliability, and requires a long time to be tightened.

[0006] (2) In the case of direct arc welding of rebars, the amount of welding increases because the welding is performed over uneven portions on the surface of the deformed rebar. However, arc welding has a remarkably poor work efficiency and worsens the work environment, and unskilled workers have low reliability of the strength of the welded portion and sometimes have a cross-sectional defect of a reinforcing bar. In addition, the high-strength rebar has a problem that the material changes due to the heat effect of welding, and welding cannot be easily performed.

SUMMARY OF THE INVENTION The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a rebar tying structure that is effective in improving assembly efficiency, improving work safety, and facilitating cooperation with related works in response to a shortage of labor. Aim.

[0008]

According to the present invention, a steel piece having a circular cross section is formed in advance as a connecting member when the main and auxiliary muscles are tightened, and this connecting material is attached so as to be wound around the main muscle to be tightened. The main part is a structure in which a portion in contact with the auxiliary muscle at the end of the material is electrically resistance-welded to connect the main muscle and the auxiliary muscle.

The details are as follows. In the first invention, a connecting member having a bent portion formed at the same curvature as the cross section of the main bar is attached so as to be wound around the main bar at the bent portion, and both ends of the connecting member are straightened. The reinforcement is brought into contact with the reinforcing bar at the portion, and the main bar and the auxiliary bar are tied by electric resistance welding at the contact portion.

A connecting member having a bent portion having the same curvature as the cross section of the main bar is attached so as to be wound around the main bar at the bent portion.
A straight hook portion bent at a right angle is provided at both ends of the connecting member, and the straight hook portion is brought into contact with an orthogonal auxiliary muscle, and electric resistance welding is performed at the abutting portion to tighten the main muscle and the auxiliary muscle. It is.

A connecting member having a bent portion having the same curvature as the cross section of the main bar is attached so as to be wound around the main bar at the bent portion.
Both ends of the connecting member are bent inward so that the distance between both ends is equal to the diameter of the auxiliary muscle, and the direct portion of the connecting member is brought into contact with the reinforcing bar, and the electrical resistance at the abutting portion. The main and auxiliary muscles are tied together by welding.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is an explanation based on the illustrated embodiment. According to the present invention, in the rebar pre-assembly method, when the main reinforcing bar 1 and the auxiliary reinforcing bar 2 are tightened, a steel slab having a circular cross section is bent into a required shape and formed as a connecting member in advance, and the main reinforcing bar 1 is formed at an intermediate bent portion of the connecting member. The main bar 1 and the auxiliary bar 2 are tightly connected to each other by contacting the reinforcing bars 2 at the straight portions at both ends of the connecting member, and welding the contact portions with electric resistance.

In the first invention shown in FIGS. 1 and 2, the connecting member 4 is formed by forming a steel slab having a circular cross section into a U-shape. The intermediate bent portion is bent at the same curvature as the cross section of the main bar 1 to form a main bar wrap portion 4a.

At the time of binding, a half circumference of the main bar 1 is wound around the main bar winding portion 4a of the connecting member 4, and
Are in contact with the peripheral side surface of the auxiliary muscle 2 orthogonal to the main muscle 1, and electric resistance welding is performed on the abutting part.

In the embodiment shown in FIGS. 3 and 4, similarly, a portion of the auxiliary muscle 2 bent at a right angle is attached to the main muscle 1, and the connecting member 6 used is an intermediate portion of a steel slab having a circular cross section. Is formed in a substantially L-shape bent at a right angle. The middle bent portion is bent to have the same curvature as the cross section of the main bar 1 to form a main bar winding portion 6a.

At the time of tightening, a half of the circumference of the main bar 1 is wrapped around the main bar wrap portion 6a of the connecting member 6, and the connecting member 6
Are in contact with the peripheral side surface of the auxiliary muscle 2 orthogonal to the main muscle 1, and electric resistance welding is performed on each abutting part.

The embodiment shown in FIG. 5 and FIG.
The auxiliary muscle 2 is made orthogonal to the main muscle 1, and at the point where the hook portion of the auxiliary muscle 7 is wound adjacent to the main muscle 1,
FIG. 2 shows an aspect in which the auxiliary muscle 2 and the auxiliary muscle 2 are tied by a connecting member 9. The connecting member 9 to be used is formed by bending a middle portion of a steel slab having a circular cross section into a substantially V shape. The middle bent portion is bent to the same curvature as the cross section of the main bar 1 to form a main bar winding portion 9.
a.

At the time of tightening, the main reinforcement 9 of the connecting member 9
In FIG. 5A, a half circumference of the main bar 1 is wound and the straight portions at both ends of the connecting member 9 are abutted on the peripheral side surface of the auxiliary bar 2 orthogonal to the main bar 1, and electric resistance welding is performed on the respective abutting portions.

The embodiment shown in FIG. 7 and FIG.
The auxiliary muscle 2 is made orthogonal to the main muscle 1, and at the point where the hook portion of the auxiliary muscle 7 is wound adjacent to the main muscle 1,
FIG. 2 shows a state in which the auxiliary muscle 7 is tied to the auxiliary muscle 7 by a connecting member 10. The connecting member 10 to be used is formed by bending an intermediate portion of a steel slab having a circular cross section at an angle wider than that of the connecting member 9,
It is formed in the shape of a letter. The middle bent part is main bar 1
Is bent to have the same curvature as the cross section of FIG.

At the time of binding, a half circumference of the main bar 1 is wrapped around the main bar wrapping portion 10a of the connecting member 10, and
The straight portions at both ends of 0 are brought into contact with the hook portions of the auxiliary bars 7 hooked on the main bars 1, and electric resistance welding is performed on the respective contact portions.

In the second invention shown in FIGS. 9, 10 and 11, a straight-line portion of the auxiliary muscle 2 bent at a right angle is attached to the main muscle 1, and the connecting member 5 used is a steel having a circular cross section. A middle portion of the piece is bent at a right angle to form a base 5a, and an intermediate bent portion of the base 5a is bent to the same curvature as the cross section of the main bar 1 to form a main bar winding contact portion 5b, and furthermore, both ends of the base 5a are formed. Each of the hooks 5c is bent at a right angle and provided with a straight hook 5c.

At the time of binding, a half circumference of the main bar 1 is wrapped around the main bar winding portion 5b of the connecting member 5 of the connecting member, and a linear hook 5c is hooked on the orthogonal auxiliary bar 2 so that the auxiliary bar 2 is hooked.
Resistance welding is performed on the contact portion between the hook and the hook 5c.

In the embodiment of the invention shown in FIGS. 12, 13 and 14, the auxiliary muscle 2 is orthogonal to the main muscle 1, and the hook of the auxiliary muscle 7 is wound adjacent to the main muscle 1 further. This shows an aspect in which the main muscle 1 and the auxiliary muscle 2 are tied by a connecting member 8. The connecting member 8 to be used is formed by bending an intermediate portion of a steel slab having a circular cross section to form a substantially V-shape to form a base 8a, and bending the intermediate portion of the base 8a to the same curvature as the cross section of the main bar 1. A main hook 8b is formed, and both ends of the base 8a are bent at right angles to each other to provide a linear hook 8c.

At the time of binding, the base 8a of the connecting member 8
, A half circumference of the main muscle 1 is wrapped around, and a straight hook 8 c is hooked on the orthogonal auxiliary muscle 2, and the auxiliary muscle 2 and the hook 8 are hooked.
The electric resistance welding is performed on the contact portion with c.

In the third invention shown in FIGS. 15 to 17, a portion of the auxiliary muscle 2 bent at a right angle is attached in contact with the main muscle 1, and the connecting member 11 used is a steel slab having a circular cross section. Is bent to form a U-shaped base portion 11a, and the middle portion of the base portion 11a is formed as a main reinforcement winding contact portion 11b bent to have the same curvature as the cross section of the main reinforcement 1. Further, both ends of the base portion 11 are formed. The auxiliary muscle contact portion 11c is bent inward so that the distance between the bent ends is equal to the diameter of the auxiliary muscle 2.
Is formed.

At the time of tightening, first, at the contact portion of the auxiliary muscle 2 with the main muscle, the main muscle winding contact portion 11b of the connecting member 11 is formed.
Then, a half circumference of the main bar 1 is wound, and the auxiliary bar 2 is held between the auxiliary bar abutting portions 11c, 11c of the connecting member 11 so that the auxiliary bar 2 is sandwiched therebetween, and the contact portion is subjected to electric resistance welding. Further, in the corner portion of the auxiliary muscle 2, the connecting member 11 having a longer leg of the base 11 a is used.
The semi-circumference of the main bar 1 is wound around at b, and furthermore, the two adjacent linear auxiliary bar contact portions 11c of the connecting member 11 are brought into contact with each other so that a portion adjacent to the corner of the auxiliary bar 2 is clamped. Conduct electric resistance welding.

[0027]

According to the present invention, the bent portion of the connecting member is formed to have the same curvature as the cross section of the main bar, so that the connecting member is easily wound around the main bar and attached. In addition, there are linear portions at both ends of the connecting material, and the linear portions are brought into contact with the main bars, so that the contact portions are substantially in point contact, so that the amount of electric resistance welding can be reduced, and the material can be reduced. A reliable welding can be expected without any change, and in the second and third inventions, the connection work can be made easier, and the welding can be reliably performed to provide a required strength.

[Brief description of the drawings]

FIG. 1 is a right side view showing a use state of the first invention.

FIG. 2 is a front view showing a use state of the first invention.

FIG. 3 is a right side view showing a use state of a modification of the first invention.

FIG. 4 is a front view showing a usage state of the modification.

FIG. 5 is a right side view showing a use state of another modification.

FIG. 6 is a front view showing a use state of the embodiment.

FIG. 7 is a right side view showing a use state of another modification.

FIG. 8 is a front view showing a use state of the embodiment.

FIG. 9 is a right side view showing a use state of the second invention.

FIG. 10 is a front view showing a use state of the invention.

FIG. 11 is a perspective view showing a use state of the invention.

FIG. 12 is a right side view showing a use state of another embodiment of the invention.

FIG. 13 is a front view showing a use state of the embodiment.

FIG. 14 is a perspective view showing a use state of the embodiment.

FIG. 15 is a front view showing a use state of the third invention.

FIG. 16 is a right side view showing a use state of the embodiment.

FIG. 17 is a sectional view showing a use state of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main bar, 2 ... Auxiliary bar, 3 ... Connecting member, 3a ... Base, 3b ... Main bar contact portion, 3c ... Hook, 4 ... Connecting member, 4a ... Main bar winding portion, 5 ... Connecting material, 5a... Base, 5b... Main bar wrapping portion, 5c... Hook, 6... Connecting material, 6a… Main bar wrapping portion, 7… Auxiliary bar, 7b. , 8 ... connecting member, 8a ... base portion, 8c ... hook, 9 ... connecting member, 9a ... main bar winding portion, 10 ... connecting member, 10a ... main bar winding portion, 11 ... connecting member , 11a ...
... Base, 11b... Main muscle contact portion, 11c... Auxiliary muscle contact portion, 12... Connecting material, 12a.
... Auxiliary muscle contact part.

──────────────────────────────────────────────────の Continued on the front page (72) Shinichi Nawata, Inventor Shinichi 520 Yokokura Nitta, Oyama City, Tochigi Prefecture Inside (72) Inventor Noboru Watanabe 520 Yokokura Nitta, Oyama City, Tochigi Prefecture Tokyo Steel Steel Co., Ltd. In-company (56) References JP-A-47-33424 (JP, A) JP-A-4-20659 (JP, A) JP-A-60-226947 (JP, A) (58) Fields investigated (Int. . ⁶ , DB name) E04C 5/06

Claims (3)

(57) [Claims] 1. A connecting member having a bent portion having the same curvature as a cross section of a main bar is attached so as to be wound around the main bar at the bent portion.
A reinforcing bar tightening structure in a rebar pre-assembly, wherein a reinforcing bar is abutted at a straight portion at both ends of the connecting member, and the main bar and the auxiliary bar are tightened by electric resistance welding at the abutting portion. 2. A connecting member having a bent portion formed at the same curvature as the cross section of the main bar is attached so as to be wound around the main bar at the bent portion, and a straight hook portion bent at right angles to both ends of the connecting member. A reinforcing structure for reinforcing bars in a rebar pre-assembly, wherein the main hooks and the auxiliary bars are tightened by electrically resisting welding at the abutting portions so that the linear hook portions abut against the orthogonal auxiliary bars. 3. A connecting member having a bent portion formed at the same curvature as the cross section of the main bar is attached so as to be wound around the main bar at the bent portion, and both ends of the connecting member are bent inward, and between the both ends. The spacing is made to be the same as the diameter of the auxiliary muscle, the direct part of the connecting material is brought into contact with the reinforcement, and the main muscle and the auxiliary muscle are tied by electric resistance welding at the abutting part. Tightening structure of rebar in pre-assembly