JPH0633642B2 - Reinforcing bar formed into a basket shape by welding embedded metal fittings for lightweight cellular concrete slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) This invention relates to a lightweight cellular concrete slab for construction (hereinafter referred to as A).
The present invention relates to a cage-shaped reinforcing reinforcing bar embedded in an LC panel), and more particularly to a reinforcing reinforcing bar for an ALC panel in which an embedded metal fitting is welded.

(Prior Art and Problems) Conventionally, in order to attach the ALC panel to the body, as shown in FIG. 5, a hole having a large diameter and a through hole 9 are formed in the formed ALC panel P to form a female screw hole. There is known a post-installation method of the metal fitting 10 in which the metal fitting 10 having a certain shape is inserted, and one end of the metal fitting 10 is opened to one side of the panel P to fill the hole with the mortar 11 and to be embedded and fixed. However, in this retrofitting method, since the metal fitting 10 is directly fixed and supported by the ALC having a relatively low strength, the strength problem that the ALC around the metal fitting is destroyed when an external force is applied, and the repair trace by the mortar 11 is a panel. There was a problem that it remained on the surface.

In order to solve the problem of strength and the problem of appearance of this retrofitting method, a reinforcement formed in a basket shape for a lightweight cellular concrete slab as shown in FIGS. 6, 7, and 8. It is known to weld embedded fittings to rebar.

However, as shown in FIG. 6, the metal fittings having a U-shaped cross section are fixed to the reinforcing bars 6 and the welding fixings 15 above and below the flange pieces 12 on both sides thereof.
In the case of the structure described above, when the positioning accuracy of the reinforcing bar 6 is poor, it is necessary to bend the reinforcing bar 6 or attach another reinforcing bar to attach the metal fitting to the reinforcing bar, which requires a great deal of labor for positioning the metal fitting. I needed it. Further, since the resistance welding with good productivity cannot be used for attaching such a metal fitting, and the use of arc welding is indispensable, which also causes a large increase in cost.

On the other hand, as shown in FIG. 7, an ALC in which a metal fitting having a U-shaped cross section is manufactured so as to absorb the poor positional accuracy of the reinforcing bar 6.
It is arranged perpendicular to the thickness direction of the panel, and the reinforcing bar 6 and the welding fixing 15 at the center of the flange pieces 12 on both sides of the bracket having a U-shaped cross section.
Reinforced bar 6 is used for positioning the metal fitting
There is no need to bend or add reinforcing bars, and the workability of positioning the metal fittings is significantly improved. However, since this metal fitting has a structure in which it is welded and fixed to the upper and lower reinforcing bars 6, it is necessary to form the reinforcing bar in a cage shape before mounting the metal fitting, which is a gun for resistance welding machines with excellent productivity. It was hard to get into and I had to use arc welding.

Therefore, Japanese Patent Laid-Open No. 60-23540 proposes a structure shown in FIG.

That is, the structure shown in FIG. 8 is a structure in which the embedding metal fittings are welded to the upper and lower reinforcing reinforcing bars formed in a basket shape, and the embedding metal fittings have a wide flange piece 1 and a narrow width flange. It has a substantially U-shaped structure composed of the piece 2 and the body plate 3,
A mounting nut 4 is provided in the thickness direction of the panel manufactured on the body plate 3 of the metal fitting and at a position communicating with and opening on the indoor surface of the panel manufactured, and the wide flange piece 1 is provided.
Is a reinforcing bar for a lightweight cellular concrete slab in which the wide flange pieces 1 are welded to at least two lower reinforcing bars 6 such that the parallel flange pieces 1 are parallel to the lower reinforcing bars 6.

This has an excellent structure having the following effects.

Great strength.

When an ALC panel is manufactured by using the one shown in FIG. 8 and the long nut 4 for mounting is screwed with the bolt 7 and mounted on the body frame 8 as shown in FIG. With respect to the force T and the bending moment M, since the metal fitting is bent and has a large rigidity, the metal fitting does not deform,
Further, since the flange piece 1 having a large width exists on the outdoor side, the pulling force T and the bending moment M are dispersed as the supporting pressure g and transmitted to the ALC base material, and the ALC base material is broken or the metal fitting moves. Never.

Since the flange piece 2 is intended to prevent local buckling of the body plate 3 when an external force T or M is applied, the protrusion length x ₁ is usually 40 to 50 mm. ₂ is about 10 mm, which is sufficient for strength.

Positioning of embedded metal and welding workability are good, and cost is easy.

The wide flange piece 1 to be welded and fixed to the reinforcing bar 6 has a larger protruding length from the main body plate 3 than the narrow flange piece 2, so that the narrow flange piece 2 does not become an obstacle and is a gun for a resistance welding machine. It is easy to pinch with, and the reinforcing bar on one side,
That is, when the product becomes an ALC panel product, the reinforcing steel bar 6 on the outdoor side
Since the structure is attached only to, the embedded metal fittings are attached before forming the reinforcing bars 6 on both sides into a cage shape, the reinforcing bars on the upper side do not obstruct, and it is easy to use a resistance welding machine. . Therefore, the productivity is good and the manufacturing cost is low.

By forming the protruding piece 5 on the wide flange piece 1, the rigidity of the wide flange piece 1 can be increased, and moreover, the welding to the reinforcing bar 6 is ensured, so that it can be buried at the time of manufacturing the panel. The fitting does not come off.

Although the reinforcing bar made by welding the embedded metal fitting for the ALC panel shown in FIG. 8 exhibits the above-mentioned excellent effects,
As an ALC panel, it is necessary to apply anti-corrosion treatment beforehand so that reinforcing reinforcing bars do not rust when used for many years on walls, etc., but basket-like reinforcing reinforcing bars with embedded fittings are immersed in rust preventive liquid to prevent During the rust treatment, bubbles accumulate on the bottom surface of the wide flange piece 1,
There was a problem that an incomplete part of rust prevention might be left.

(Means for Solving the Problems) The reinforcing steel bar welded to the embedding metal fitting for an ALC panel of the present invention has a structure in which the embedding metal fitting is welded to the upper and lower reinforcing steel reinforcements formed in a basket shape. The embedded metal fitting has a structure having a substantially U-shaped cross section composed of a wide flange piece, a narrow flange piece, and a main body plate. Communication with the indoor surface
Lightweight cellular concrete in which a mounting nut is provided at an opening position, and the wide flange pieces are welded to at least two lower reinforcing bars so that the wide flange pieces are parallel to the lower reinforcing bars. In a reinforcing bar for a plate, a wide flange piece welded to the reinforcing bar is characterized in that notches are formed at both ends thereof and a plurality of openings are formed at the center thereof. .

(Example) Hereinafter, an example shown in the drawings will be described.

As shown in Fig. 2 and Fig. 3, the embedded metal fittings used are
The main body plate 3 and a wide flange piece 1 bent vertically from the main body plate 3 and a narrow flange piece 2 are formed in a substantially U-shaped cross section. This wide flange piece 1
The notch 13 is press-formed at both ends thereof, and a plurality of openings 14 are press-formed at the center thereof.

The protruding length x ₁ of the wide flange piece ₁ is usually 40 to 50 m.
The flange length 2 of the narrow flange piece ₂ is usually about 10 mm.

A long nut 4 for mounting is welded to the main body plate 3 of the embedded metal fitting in the thickness direction of the panel to be manufactured and at a position communicating with and opening to the indoor surface of the panel to be manufactured.

In this embedded fitting, the wide flange pieces 1 are welded to at least two lower reinforcing bars 6 so that the wide flange pieces 1 are parallel to the lower reinforcing bars 6.

The mounting state of the embedding metal fittings to the basket-shaped reinforcing bar as a whole is such that the embedding metal fittings are present at the four corners of the ALC panel as shown in FIG. I did it.

Further, as shown in FIG. 2 and FIG. 3, two protruding pieces 5 are press-molded on the outer side of the wide flange piece 1 over the entire length in the longitudinal direction of the embedding metal fitting to facilitate welding.

(Effect) The reinforcing reinforcing bar for an ALC panel of the present invention has the following effects.

Since the notch portion 13 and the opening portion 14 are formed in the wide flange piece 1 which is directly welded to the reinforcing bar 6, the cage-shaped reinforcing bar having the embedding metal fitting is immersed in the anticorrosive liquid. When a rust preventive treatment is performed, the conventional problem that air is trapped on the lower surface of the wide flange piece 1 and leaves an incomplete rust preventive portion is completely eliminated, and it has a very excellent rust preventive coating film. Becomes

In addition, proposed in JP-A-60-23540,
The embedded product of the structure shown in FIG. 8 has a substantially U-shaped cross section composed of a wide flange piece, a narrow flange piece, and a body plate, and the thickness direction of the panel manufactured on the body plate of the metal fitting. In addition, a mounting nut is provided at a position communicating with and opening on the indoor side surface of the manufactured panel, and the wide flange piece has at least 2 so that the wide flange piece is parallel to the lower reinforcing bar. It retains all the excellent surfaces of the reinforcing bars for ALC panels that are welded to the reinforcing bars under the book, and also when manufacturing ALC panels.
A around the embedded metal fittings without hindering foaming of mortar
It is filled with LC mortar and has no voids
There is no problem in the strength or appearance of the C panel.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining the overall arrangement of an embedding metal fitting in a reinforcing bar with an embedding metal fitting of the present invention, and FIG. 2 is a perspective view of a main part of a reinforcing steel bar with an embedding metal fitting of the present invention. Figures and 3
The side view of the principal part of the reinforcing bar with embedded fittings of the present invention,
The figure is a cross-sectional view showing a state in which the ALC panel is attached to the body, FIG. 5 is a cross-sectional view of the conventional ALC panel, and FIGS. 6, 7, and 8 are different conventional ALCs with embedded fittings. It is a perspective view which shows the principal part of the reinforcing reinforcing bar for panels. 1 ... Wide flange piece, 2 ... Narrow flange piece, 3 ... Main body plate, 4 ... Mounting nut, 5 ... Projection piece, 6 ... Reinforcing bar, 7 ... Bolt, 8 ... Frame frame, 9 ... Penetration Holes, 10 ... Metal fittings, 11 ... Mortar, 12 ... Flange, 13 ... Notch, 14 ... Opening, 15 ... Weld, P ... ALC panel, PA ... Interior surface, PB ... Exterior surface.

Claims (1)

[Claims] 1. A structure in which embedding metal fittings are welded to upper and lower reinforcing rebars formed in a basket shape, and the embedding metal fittings have a substantially cross-section consisting of a wide flange piece, a narrow flange piece, and a main body plate. The U-shaped structure is such that a mounting nut is provided in a thickness direction of a panel manufactured on the body plate of the metal fitting and at a position communicating with and opening on the indoor side surface of the manufactured panel, and the wide flange is provided. Reinforcing bars for lightweight cellular concrete plates, wherein the wide flange pieces are welded to at least two lower reinforcing bars so that the pieces are parallel to the lower reinforcing bars. The wide flange piece has notches at both ends, and multiple openings are formed at the center of the flange piece. Rebar.