JP2000160752A - Base for erection bar, erection bar, and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an erection bar that can be spot welded at a low current without a weld mark appearing on the lower surface of a base. SOLUTION: A reinforcement junction wall 2 is formed on the upper surface of a steel plate and a projecting strip 3 is formed on one side of the reinforcement junction wall 2. Reinforcement 4 is secured to the projecting strip 3 by spot welding and the projecting strip 3 is crushed to obtain an erection bar. Thus, since the projecting strip 3 and the reinforcement 4 make point contact with each other, the spot welding at a low current is made possible. Since the welding is performed on the side face of the reinforcement junction wall, no weld mark appears on the surface of a base.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled reinforcing bar used as a floor structural material or the like.

[0002]

2. Description of the Related Art Conventionally, an assembled reinforcing bar generally has a structure in which a reinforcing bar mounted on a truss is fixed to a horizontal portion of an upper surface of a substrate by spot welding. There has also been proposed a structure in which a reinforcing-bar joining wall is erected on the upper surface of a substrate, and a reinforcing bar is fixed thereto by spot welding.

[0003]

In spot welding, a current is applied to the contact portion between the two members to be welded, so that the smaller the area of the contact portion between the two members, the lower the current. However, in the conventional board, the board and the rebar were in line contact. For example, in a case where a reinforcing bar joining wall is erected on a substrate, the reinforcing bars come into contact over the entire vertical length of the joining wall. For this reason, since the current is dispersed, it is necessary to flow a relatively high current, and the current efficiency is poor, which is a factor that increases the manufacturing cost.

In a structure in which a reinforcing bar is welded to the upper surface of a substrate, a welded portion appears on the lower surface of the substrate, and the welded portion exposed on the lower surface comes into contact with outside air and causes corrosion. Further, since it is not preferable from the viewpoint of aesthetics that the welded portion is exposed, the substrate cannot be exposed to the ceiling, and a treatment with a decorative material is indispensable.

[0005]

Means for Solving the Problems The invention according to claim 1 relates to a substrate for an assembling rebar, in which a rebar joint wall formed by bending the iron plate at a predetermined interval is formed on an upper surface of an iron plate, and is provided on one surface of the rebar joint wall. A spot is formed by forming a ridge and bringing a reinforcing bar into contact with the ridge. The invention of claim 2 is
The substrate for an assembling rebar according to claim 1 is constituted by a colored iron plate whose lower surface is colored. According to a third aspect of the present invention, there is provided an assembling rebar using the assembling rebar substrate according to the first or second aspect, wherein the rebar is spot-welded to the ridge of the rebar joint wall, and the ridge of the assembling rebar is formed at a welded portion. It was crushed. The invention according to claim 4 is a method for manufacturing the assembled reinforcing bar according to claim 3, wherein the reinforcing bar is pressed into contact with the ridge of the substrate for the assembled reinforcing bar, and the ridge and the reinforcing bar are spot-welded. It is characterized by crushing.

[0006]

In the substrate for an assembled reinforcing bar according to the present invention, since the ridge is formed on the reinforcing bar joining wall, the substrate and the reinforcing bar come into contact only at the tip of the ridge. That is, the contact state between the two is point contact. Therefore, without dispersing the current, 1
Since the current flows intensively at the point, it is possible to perform welding with a low current. Further, since the reinforcing bar is fixed to the reinforcing bar joining wall of the substrate, the welded portion is covered with concrete and is not exposed. Therefore, the welded portion does not come into contact with the outside air to cause corrosion, and if a colored iron plate is used for the substrate, it can be used as a ceiling material without being treated with a decorative material.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
Has a reinforcing joint wall 2 formed by bending an iron plate at a predetermined interval on an upper surface thereof, and a reinforcing steel 4 of the reinforcing joint wall 2 is provided.
A convex strip 3 is formed by bending two iron plates constituting the reinforcing bar joining wall 2 together on the contact side of the reinforcing bar. The rebar joint wall 2 is formed to be inclined in accordance with the inclination of the rebar in the drawing, but may be formed vertically. Also, ridge 3
Is located at the upper and lower middle portions of the reinforcing steel joint wall 2 as shown in FIG.
The upper end may be used. Furthermore, since it is sufficient if the ridge 3 is present at the joint with the reinforcing bar, the ridge 3 does not necessarily have to be provided continuously over the entire length of the substrate, and may be formed intermittently. And can improve the buckling strength of the substrate.

[0008] Substrate 1 for assembled rebar constructed as described above
The rebar 4 is applied to the rebar joint wall 2 of the above, and spot welding is performed. At this time, the reinforcing bar 4 does not make line contact with the reinforcing bar joining wall 2, but comes into a state of point contact with the tip of the ridge 3. Then
When an electric current flows while pressurizing the reinforcing bar joining wall 2 and the reinforcing bar 4 in the facing direction, the current flows intensively at the contact point 5 and does not disperse. Due to the pressurization at the time of the spot welding, the ridges 3 are crushed, and the two iron plates constituting the ridges 3 and the reinforcing bars 4 are fixed, and the reinforcing bars 4 are closely attached to the upper and lower sides of the reinforcing bar joining wall 2. In addition, even when the rebar joint wall 2 is erected vertically, the rebar joint wall is inclined along the inclination of the rebar due to the pressurization at the time of spot welding, and the rebar is closely attached to the upper and lower sides of the rebar joint wall.

FIGS. 3 and 4 show examples of assembled reinforcing bars obtained by carrying out the present invention. The reinforcing bars 4 are bent suspension bars.
The truss composed of is suspended and fixed. In addition,
The reinforcing bar structure shown in FIGS. 3 and 4 is merely an example, and the structure and method of the present invention can be applied to any reinforcing bar.

FIG. 5 shows an embodiment in which a ridge 3 is formed at the upper end of the reinforcing bar joining wall 2. Here, although the lower part of the rebar 4 is formed vertically, it may be inclined as shown in FIG.

FIGS. 6 and 7 show a configuration in which a ridge 3 is formed on the opposite side of the pair of reinforcing bar joining walls 2 and 2 so that the reinforcing bar 4 is joined. The reinforcing bar 4 shown in FIG. 6 is a frame-shaped spacer bar, on which a truss composed of an upper bar 6, a lower bar 7, and a lattice bar 8 is fixed.

[0012]

According to the present invention, the following effects can be obtained. 1. Since the ridge is provided on the reinforcing bar joining wall, the reinforcing bar comes into point contact with the tip of the ridge. Therefore, current in spot welding flows intensively at one point, and welding can be performed with a low current, which is extremely efficient. 2. In addition to improving the flexural strength of the substrate, the reinforcing joint wall can be designed as a substitute for the lower end of the truss.
In addition, since the ridges formed on the reinforcing-bar joining wall function not only as a contact portion with the reinforcing bar but also as a rib, the strength as an assembled reinforcing bar is further improved. 3. The weld between the substrate and the rebar is completely covered with concrete by casting concrete. Therefore, the welding portion does not come into contact with the outside air, and corrosion from the welding portion can be prevented as much as possible. 4. Since the welded portion does not appear on the lower surface of the substrate, the lower surface of the substrate can be exposed as a ceiling material. Then, by forming the substrate with a color iron plate, it can be used as a ceiling without using a decorative material.

[Brief description of the drawings]

FIG. 1 is a front view showing a relationship between a substrate and a reinforcing bar before welding according to the present invention.

FIG. 2 is a front view showing a state after welding.

FIG. 3 is a front view of the assembled reinforcing bar of the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is a front view showing a relationship between a substrate and a reinforcing bar according to another embodiment of the present invention.

FIG. 6 is a front view showing a relationship between a substrate and a reinforcing bar according to still another embodiment of the present invention.

FIG. 7 is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Reinforcement joint wall 3 Ridge 4 Reinforcement 5 Contact point 6 Upper end 7 Lower end 8 Lattice

Claims (4)

[Claims] 1. A reinforcing bar joint wall formed by bending the iron plate at a predetermined interval is formed on an upper surface of an iron plate, a convex line is formed on one surface of the reinforcing bar joint wall, and a reinforcing bar is brought into contact with the convex line to form a spot. Assembled rebar substrate for welding 2. The substrate for an assembling rebar according to claim 1, wherein the iron plate is a colored iron plate whose lower surface is colored. 3. The assembled reinforcing bar according to claim 1, wherein a reinforcing bar is spot-welded to the assembled reinforcing bar substrate, and a ridge of the assembled reinforcing bar substrate is crushed at a welded portion. 4. The assembled reinforcing bar according to claim 1 or 2, wherein a reinforcing bar is pressed against the ridge of the assembled reinforcing bar substrate, the ridge and the reinforcing bar are spot-welded, and the ridge is crushed. Manufacturing method