JPH11210160A - Shear reinforcement for reinforced concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shear reinforcement for reinforced concrete, in which outer peripheral reinforcement and auxiliary reinforcements are previously welded and integrated together in such a way that they do not linearly overlap, the reinforcement being made of a material of high strength which is suited for welding and excellent in machinability. SOLUTION: Outer peripheral reinforcement 3 is bent to match the form of the outer periphery of main reinforcement 1 installed, and has both ends connected and integrated together by welding 6. Auxiliary reinforcements 4, 5 are extended across the outer peripheral reinforcement 3 and welded at their respective ends to form integrated shear reinforcement. The outer peripheral reinforcement 3 or/and the auxiliary reinforcements 4, 5 use steel wires of venite structure. The shear reinforcements are produced in a factory or the like and conveyed to a construction site. The plurality of shear reinforcements are laid on top of the main reinforcement 2, are sequentially pulled down from the lower ones, placed horizontally in predetermined positions, and joined with the main reinforcement 2 at their intersections by welding 6, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shear reinforcement for reinforced concrete construction.

[0002]

2. Description of the Related Art Conventionally, super-high-rise buildings have been mainly made of steel-framed reinforced concrete structures, but recently, reinforced concrete structures have increased due to demands for reduction of construction costs and simplification of on-site construction. In the case of reinforced concrete,
In the on-site construction, it is customary to wrap the outer rebar 3 around the main rebars 1 and 2 built as shown in FIG. 5 (a) and arrange the auxiliary rebars 4 and 5 inside thereof. The work required a lot of trouble and time. Conventionally, as a reinforcing reinforcement for a column under a high axial force, a column with a hook bent at 135 degrees as shown in FIGS. 5 (a) and 5 (b) and a closure by welding as shown in FIG. Shaped ones or ones drawn by bending as shown in (d) are used.

[0003]

Recently, a spiral reinforcing bar or a reinforcing bar whose outer peripheral bar is closed in advance by welding at a factory is used as a shear reinforcing bar, and the labor for construction has been considerably reduced. Since the attachment of the auxiliary muscle to the body is the same as before, it takes time and effort. In order to prevent this, the conventional welded closed type or one-stroke shape may be used. However, since the reinforcing bars partially overlap each other, there is a disadvantage that the filling property of the poured concrete is deteriorated. or,
The strength of the rebar used, welding aptitude, workability, etc. also become problems.

The present invention has been made in order to solve the above-mentioned drawbacks and problems of the prior art, and the outer rebar and the auxiliary rebar are welded and integrated in advance so that the rebars do not overlap linearly.
Moreover, an object of the present invention is to provide a shear reinforcing bar for reinforced concrete construction, which uses a reinforcing bar having high strength and excellent in weldability and workability.

[0005]

As a means for achieving this object, the present invention relates to a method in which a main bar is bent in accordance with the outer peripheral shape of the main bar, and is welded at a portion other than circumscribing the main bar. The gist of the present invention is a shear reinforcing bar for reinforced concrete construction, which includes the provided outer reinforcing bar and an auxiliary bar which is inserted into the outer peripheral bar and has an end welded to the outer peripheral bar. In addition, the gist of the present invention is that the outer circumferential bar and / or the auxiliary bar is a steel wire having a bainite structure.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1A shows an example of the shear reinforcement according to the present invention.
Is bent in accordance with the outer peripheries of the main bars 1 and 2 built in a rectangular shape as described above, and both ends thereof are welded 6 to be connected and integrated in a frame shape.

Next, a plurality of (two in the illustrated example) auxiliary muscles 4 and 5 are inserted into the opposing sides of the frame-shaped outer peripheral muscle 3 in a position where they come into contact with the main muscle 2, and each auxiliary muscle 4 is extended. ,
Both end portions of the 5 is welded respectively to the outer peripheral muscle 3, easily joined to form a grid-like shearing reinforcements S ₁ the intersection of the auxiliary muscles 4,5 by welding or the like.

In this case, the outer peripheral muscle 3 and / or the auxiliary muscle 4,
No. 5 is preferably a steel wire having a low carbon content, excellent strength and ductility, and a bainite structure with good weldability and workability. The six welded portions of the outer circumferential bar 3 are the main bar 1,
2 circumscribed part (weld of corner and auxiliary bars 4, 5)
Set to avoid.

The lattice-type shear reinforcement S ₁ constructed as described above is produced in advance in a factory or the like, and is carried into a construction site for use. In use, with respect to the main reinforcement 1 and 2 as shown in FIG. 2, it is positioned at the top in a state of overlapping a plurality of shearing reinforcements S _1, predetermined position pulls down from the lower ones in the order for example pitch 100~150mm about And the points of intersection with the main bars 1 and 2 are easily bound by a number line or welding. In this case, in the lower part of the pillar, it is effective as a positioning muscle for the main muscles 1 and 2.

[0010] After reinforcement shear reinforcements S _1, it is possible to construct reinforced concrete prisms 8 to Da設concrete 7 as shown in FIG. 1 (b).

FIG. 3A shows another embodiment of the present invention. As shown in FIG. 3B, the outer peripheral bar 13 is bent in accordance with the outer periphery of the main bar 11 which is erected in a circle. Then, the both ends are welded 16 and connected and integrated in a ring shape.

The ring-shaped outer peripheral stripe 13 is provided with a plurality (FIG. 3).
(A), three (6) (B) auxiliary muscles 14 are diametrically arranged, and they are positioned in contact with the main muscles 11, and both ends are welded to the outer peripheral muscles 13. while the intersection of the auxiliary muscles 14 (center point) is easily joined by welding or the like to form a shear reinforcement S _2.

Also in this case, it is preferable to use a steel wire having a bainite structure as the outer peripheral bar 13 and / or the auxiliary bar 14. The weld 16 of the outer peripheral bar 13 includes a portion circumscribing the main bar 11 and the auxiliary bar 14. Set so as to avoid welds.

The circular reinforcement S ₂ of the circular type thus constructed is produced in a factory or the like, and is carried on-site and used similarly to the shear reinforcement S ₁ . How to use
Wherein is the same as the shear reinforcements S _1, it is possible to construct a reinforced concrete cylinder 18 by pouring concrete 17 as shown in FIG. 3 (b) after reinforcement.

FIG. 4 shows still another embodiment of the present invention, in which (a) is a rhombus type, and a shear reinforcement S _{3 in} which an auxiliary muscle 24 is connected in a rhombus inside a rectangular outer peripheral muscle 23. (B) is a brace type, in which a reinforcing muscle S _{4 in} which an auxiliary muscle 34 is braided inside a rectangular outer peripheral muscle 33.
It is. Further, (c) is a special circular type, a shear reinforcement S ₅ connected auxiliary muscle 44 to inscribed circle within a square outer peripheral muscle 43, (d) is a polygonal type, such as shear reinforcement S ₆ that the auxiliary muscles 54 are connected respectively to the opposite sides of the hexagon periphery muscle 53. However, it is not limited to a hexagon.

In any case, the outer peripheral bar is bent in accordance with the outer peripheral shape of the built-in main bar, and is welded and integrated at a portion other than circumscribing the main bar, and an auxiliary bar is attached to this outer bar. A shear reinforcing bar having a required shape is formed by passing over and welding. The shape, strength, diameter, etc. of the auxiliary muscle inside the shear reinforcement are secured while maintaining the required strength and toughness of the column.
What is necessary is just to determine suitably for the purpose of restricting a main muscle.

As described above, the outer peripheral muscle and / or the auxiliary muscle are:
By using a steel wire having a bainite structure, processing is facilitated, welding can be performed well, and a high-strength shear reinforcing bar can be formed.

Since the shear reinforcing bar of the present invention has a structure in which the outer peripheral bar and the auxiliary bar are integrated in advance, it is suitable for production in a factory and the like, and can be manufactured accurately. Can be significantly improved. In addition, since the main reinforcing bar and the outer circumferential bar are circumscribed at a bent portion or a straight portion of one reinforcing bar, there is no 135 ° bent hook portion or a linear overlapping portion as in the conventional case, and the insufficient filling portion of the poured concrete. Does not occur. Further, since the outer peripheral muscles are restrained by the auxiliary muscles in the direction of attracting each other (inside), the overhang of the outer peripheral muscles at the time of placing concrete is suppressed, and the predetermined strength and toughness can be reliably obtained.

[0019]

As described above, according to the present invention,
Shearing reinforcements, which have been produced with high precision and high quality at factories, etc., are brought to the site in advance, and inserted into the main reinforcements so that they can be easily arranged. Filling can be performed favorably, so that the accuracy and quality of the pillar can be improved. In addition, by using a steel wire having a bainite structure as the outer circumferential bar and / or the auxiliary bar, processing can be facilitated, welding can be improved, and a high-strength shear reinforcing bar can be formed. Further, since the shear reinforcing bars also serve as positioning bars for the main bars, not only the accuracy of cast concrete is improved, but also the restraining effect of the main bars can be increased and the core concrete can be effectively restrained. Therefore,
The shear strength against a high axial force and a high shear force alternating force at the time of a large earthquake is increased, sufficient toughness is obtained, and a stable and stable restoring force can be secured. As a result, application to a high-rise building made of reinforced concrete is sufficiently possible, and the effect is enormous.

[Brief description of the drawings]

1 shows an embodiment of the present invention, in which (a) is a plan view of a lattice-shaped shear reinforcing bar, and (b) is a cross-sectional view in a state where a prism is constructed.

FIG. 2 is an explanatory view showing a construction procedure at a construction site.

FIG. 3 shows another embodiment of the present invention, in which (a) is a plan view of a circular shear reinforcing bar, and (b) is a cross-sectional view in a state where a column is constructed.

FIG. 4 shows still another embodiment of the present invention.
(A) is a plan view of a rhombus type shear reinforcement, (b) is a brace type shear reinforcement, (c) is a circular type shear reinforcement, and (d) is a polygonal type shear reinforcement. is there.

5 (a) and 5 (b) are plan views each showing a conventional example, in which (a) and (b) have a 135 ° hook, (c) is a welded closed type, and (d) is a single-draw type .

[Explanation of symbols]

 1, 2 ... main bar 3 ... peripheral bar 4, 5 ... auxiliary bar 6 ... welding 7 ... concrete 8 ... prismatic column 11 ... main bar 13 ... peripheral bar 14 ... auxiliary bar 16 ... welding 17 ... concrete 18 ... column 23, 33, 43, 53 ... peripheral muscle 24, 34, 44, 54 ... auxiliary muscle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuaki Kawamura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Nobumi Yamamoto 6-2 Gobancho, Chiyoda-ku, Tokyo Tor Steel (72) Inventor Nosuke Ikegami 3-8-24 Himonya, Meguro-ku, Tokyo

Claims (2)

[Claims] 1. An outer peripheral bar which is bent in accordance with the outer peripheral shape of a main bar and is welded and connected to a portion other than circumscribing the main bar. Shear reinforcement for reinforced concrete construction consisting of an auxiliary reinforcement welded to the outer peripheral reinforcement. 2. The shear reinforcing bar for reinforced concrete construction according to claim 1, wherein the outer circumferential bar and / or the auxiliary bar is a steel wire having a bainite structure.