JPS592245Y2 - Rebar support with synthetic resin cap - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a reinforcing bar support with a synthetic resin cap.

The lower ends of the leg rods of steel wire rebar supports are exposed to the outside from the concrete wall surface after concrete is poured, and rust occurs.

In order to solve this rusting problem, it has been proposed to provide a cap made of synthetic resin to the lower end of the leg rod of the reinforcing bar support.

Generally, this type of reinforcing bar support is manufactured by cutting and then bending iron wire.

When cutting iron wire, there is a tendency for burrs to occur at the cut portion and to some extent to hit the mark, and these burrs remain at the lower end of the leg rod of the reinforcing bar holder.

Therefore, when inserting the lower end of the leg rod of the reinforcing bar holder into the vertical hole of the synthetic resin cap, the tendency of bending and bending hinders the above insertion, and this is extremely noticeable especially when the insertion is carried out automatically and mechanically. This usually results in insertion loss of 20 to 30%.

In addition, with products that are simply inserted, it is inevitable that some of the caps will become loose due to dimensional errors, and some of the caps may naturally fall off from the leg rods during transportation or installation. there were.

The present invention has been developed with the aim of eliminating all of the above-mentioned conventional problems, and will be described below based on drawings showing an example of the implementation of the present invention.

In the figure, 1 is a reinforcing bar receiving body made of iron wire, and this body 1 is composed of two gate frames la and lb that are orthogonally crossed at the top and combined, and has four legs 2. ing.

The structure of the main body 1 is not limited to that shown in the drawings, and any structure may be used as long as it is made of iron wire and has a plurality of legs 2.

Reference numeral 4 denotes a synthetic resin cap having a mounting hole 3 formed so as to open at the center of the upper surface, and inserted into the lower end of the leg portion 2 of the main body 1 in the mounting hole 3, The cap 4 is made of thermoplastic synthetic resin, such as high density polyethylene.
Molded from polypropylene, vinyl chloride, nylon, etc.

Reference numeral 5 denotes a molten resin layer formed on the peripheral wall of the attachment hole 3 of the cap 4, and the synthetic resin cap 4 is welded and fixed to the lower end of the leg portion 2 via this molten resin layer 5.

This molten resin layer 5 is formed by melting the peripheral wall of the attachment hole 3 of the cap 4 by heat applied to the lower end of the leg 2.

For example, the lower end of the leg portion 2 is heated to a temperature above the melting temperature of the resin and below the decomposition temperature; for example, in the case of polyethylene (high density), it is heated to a temperature of about 200 to 300°C.

It is advantageous to insert the cap 4 into the heated lower end of the leg 2 while exhausting air from the mounting hole 3.

Specific examples of the exhaust means are shown in FIGS. 5, 6, and 7.

In FIG. 5, a rectangular, for example square, mounting hole 3 is formed, and the corner portion 3a of the mounting hole 3 is inserted into the leg portion 2 (
An example is shown in which the mounting hole 3 is configured to protrude further to the side (indicated by imaginary lines in FIG. 5), and the air in the mounting hole 3 is discharged through this corner portion 3a.

In FIG. 5, 3b is a resin part that is melted when the leg part 2 is inserted, and the resin eluted from this resin part 3b flows into the corner part 3a and finally completely fills it. .

This mounting hole 3 may be a regular triangle or a polygon of regular pentagon or more instead of a square.

Further, the mounting hole 3 may be star-shaped as shown in FIG. 6, or gear-shaped as shown in FIG.

Reference numeral 6 denotes a portion of an anchor formed at an appropriate position at the lower end of the leg portion 2, and the anchor portion 6 is embedded in the molten resin layer 5.

The anchor portion 6 may be formed continuously around the entire circumference of the lower end of the leg portion 2, or may be formed intermittently as shown in FIGS. 2 and 3.

When the anchor portions 6 are formed intermittently, an effect of preventing rotation can be obtained in addition to an effect of preventing slippage.

This anchor portion 6 may be of a protruding shape as shown in FIGS. 2 and 3, or may be a concave shape as shown in FIG. It should be kept to a level that does not exceed the thickness of the resin layer 5.

In the present invention, since the peripheral wall of the vertical hole 3 of the cap 4 is melted by the heat applied to the lower end of the leg 2 of the reinforcing bar receiving body 1 when the lower end of the leg 2 is inserted, Even if the lower end of the leg 2 has a sharp edge when cutting and/or is somewhat pointed, and furthermore, the anchor part 6 formed at the lower end of the leg 2 has a protruding shape. However, this insertion can be easily and reliably performed with a small pushing force.

According to the present invention, the cap 4 for the lower end of the leg 2 is
The insertion work can be easily performed automatically and mechanically without insertion loss, and this type of reinforcing bar receiver can be mass-produced and provided at a low price.

The fact that it can be provided at such a low price is extremely useful in view of the fact that reinforcing bar supports are used in large quantities at one time as consumable items.

Further, the cap 4 is welded to the lower end of the leg 2 of the reinforcing bar receiving body 1 by a molten resin layer 5, and an anchor portion 6 formed at the lower end of the leg 2 is embedded in the resin layer 5. As a result, an extremely strong insertion state can be obtained, and the problem of the cap 4 falling off naturally during transportation or construction can be solved.

In the present invention, it is advantageous to form the bottom surface of the cap 4 as flat as possible in order to obtain a large pressure receiving area, and a non-slip 7 is formed on this flat bottom surface 4a (see Fig. 2). I can do it.

Further, since the lower end of the cap 4 may be scraped off when smoothing the concrete wall surface with a grinder or the like after concrete is poured, it is preferable to form the bottom part somewhat thick.

In the present invention, the cap 4 is attached to the leg 2 as shown in FIG.
It may also be inserted into the horizontal bent portion 2b at the lower end of.

Further, the anchor part 6 may be a cut groove 6a as shown in FIG. 8, and the cut groove 6a may be formed vertically in multiple stages.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the implementation of the present invention, and Fig. 2 is a perspective view showing an example of the implementation of the present invention.
3 is a perspective view of the reinforcing bar receiving body of the product shown in FIG. 1, FIG. 4 is a perspective view of the joint or resin cap, and FIGS. 5 and 6. and FIG. 7 are explanatory diagrams showing an example of the exhaust means, respectively, and FIG. 8 is a longitudinal cross-sectional view of the main part showing the other side of the implementation of the present invention. In the figure, 1 is the reinforcing bar receiving body, 2 is the leg rod, 3 is the mounting hole, 4 is the synthetic resin cap, 5 is the molten resin layer, and 6 is a part of the anchor.

Claims (1)

[Scope of utility model registration request] A reinforcing bar receiving body 1 made of iron wire has a plurality of legs 2, and a mounting hole 3 is formed so as to open on the upper surface, and in this mounting hole 3, the lower end of each leg 2 of the main body 1 is attached. The cap 4 consists of a thermoplastic synthetic resin cap 4 inserted into the mounting hole 3, which is melted by the heat applied to the lower end of the leg 2 when the leg 2 is inserted. A composite structure characterized in that the resin layer 5 is welded to the lower end of the leg 2, and an anchor portion 6 formed at the lower end of the leg 2 is embedded in the molten resin layer 5. Rebar support with resin cap.