JPH07150687A - Spacer for bundled bar - Google Patents

Abstract

PURPOSE:To maintain intervals between reinforcing bars constituting bundled bars and to connect bundles of reinforcing bars together when conventional reinfrocing bars of normal size are bundled for use. CONSTITUTION:In a spacer 10 for use in bundled bars 13 to be placed in concrete, wherein a plurality of bar-shaped reinforcing bars 1 are bundled so as to be spaced apart from each other a predetermined interval, a plurality of threaded holes for threaded engagement with each threaded portion of a plurality of the reinforcing bars 1 are formed in the axial direction from a predetermined point of the opposite ends of the spacer. Each end threaded portion of bar-shaped reinforcing bars constituting the bundled bars 13 is screw- threadedly engaged with each holes 12 from the opposite end surface to connect the bundles of bars 13 together, while the bars 1 are spaced apart a predetermined interval from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer for a bundling bar, and more particularly to a spacer for a bundling bar used as a reinforcing bar in RC construction or reinforced concrete construction.

[0002]

2. Description of the Related Art Conventionally, in RC construction, it is well known that a large number of rod-shaped reinforcing bars are arranged at a predetermined interval.
Generally, the distance between one bar-shaped rebar and another adjacent bar-shaped rebar is 1.7 D when the diameter of the bar is D due to the problem of the anchoring of concrete to the bar. 2.7D) is to be provided.

[0003]

Generally, there are only a few types of reinforcing bars used in RC construction by their diameters. Therefore, when many reinforcing bars are arranged to increase the strength of RC construction, the distance between the reinforcing bars is increased. There was a problem that the cross-sectional area of the reinforced concrete structure would become large after securing it.

In order to avoid this, if a reinforcing bar thicker than the standard product is to be used, a custom-made product must be used, which significantly increases the cost and is also a cause of an increase in construction cost. Become. Therefore, this problem can be solved if conventional rebars of regular size can be bundled and used.

However, when a plurality of bar-shaped reinforcing bars 1 are simply bundled as shown in FIG. 6, the central part thereof becomes an extremely narrow space 2 closed in four directions. For this reason, simply bundling the conventional rebars 1 having a normal size does not allow the concrete to enter the space portion 2 at the center of the rebar 1, and even if the concrete rebars, it causes a problem in fixing the rebar.

An object of the present invention is to solve the above-mentioned conventional problems, and when the conventional rebars of conventional size are bundled and used, the distance between the rebars constituting the bundled bar is maintained. Another object of the present invention is to provide a spacer for bundled muscles that can connect the bundled muscles.

[0007]

The present invention is a spacer for bundling streak, and has the following constitution in order to solve the above-mentioned technical problems. That is, the present invention is a spacer 10 used for a bundling bar 13 which is bundled with a plurality of bar-shaped reinforcing bars 1 at a predetermined interval from each other and arranged in concrete, wherein each end of each of the bar-shaped reinforcing bars 1 is used. A plurality of screw holes 12 to which the screw parts are screwed and attached are formed in the axial direction from predetermined positions on both end faces, and each end screw part of each bar-shaped reinforcing bar 1 constituting the bundling bar 13 is inserted into each of the screw holes 12. It is characterized in that the bundling bars are connected to each other by screwing from the both end surface sides and the intervals between the bar-shaped reinforcing bars 1 are maintained.

[0008]

According to the spacer for bundling bar of the present invention, the threaded end portion of each conventional rod-shaped reinforcing bar of a conventional size is screwed into each threaded hole formed in one end surface of the spacer to be attached to a predetermined size. Reinforcing bars are bundled at intervals of. Further, similarly, the threaded holes formed on the other end surface of the spacer are similarly screwed and attached to the threaded end portions of the rod-shaped reinforcing bars, so that the bundled bars are substantially connected to each other. . That is, this spacer also functions as a joint for the bundling streak.

[0009]

EXAMPLES The spacers for the binding muscles of the present invention will now be described in more detail with reference to the examples shown in the drawings. FIG. 1 shows a bracing bar spacer 10 according to an embodiment of the present invention. The bundling spacer 10 according to this embodiment is a rod-shaped end face having a cruciform shape, and the projecting portion 1 for bundling four rod-shaped reinforcing bars 1 of a conventional size on both end faces.
A screw hole 12 is formed in each of 1a, 11b, 11c and 11d.

On the other hand, at each end (not shown) of a conventional bar-shaped reinforcing bar of conventional size which is formed as a bundling bar, a threaded portion which can be screwed into a screw hole 12 formed on the end face of the spacer 10 is formed on the outer periphery thereof. Are formed. Therefore, when four conventional rebar-sized bar-shaped reinforcing bars 1 are bundled to form a bundling bar 13 (FIG. 2), the end thread portion of each reinforcing bar 1 is formed on one end surface of the spacer 10. The holes 11a to 11d are screwed and attached.

As a result, the rebars 1 are bundled while maintaining a predetermined space. Such spacers 10 are provided at both ends of the bundling bar 13. However, since both ends of each rebar 1 are screwed into the screw holes 12 of each spacer 10, the four rebars 1 are simultaneously rotated. It is necessary to screw the spacers 10 on both sides at the same time.

The bundling muscle 1 thus constructed
If the length of 3 is relatively long and there is a risk that the spacing between the both ends will be unstable due to the bending of the reinforcing bars, it is also preferable to appropriately dispose the intermediate spacer 14 as shown in FIG. .

As shown in FIG. 3, the intermediate spacer 14 has the same end face shape as that of the spacer 10 shown in FIG. 1, and its four protrusions 15a, 15b, 15c, 15d.
Through holes 16 are formed in each of which the reinforcing bars 1 that form the bundling bars 13 can be inserted. Of course,
The mutual positional relationship between these four through holes 16 is exactly the same as the mutual positional relationship between the screw holes 12 in the spacer 10.

By arranging such an intermediate spacer 14 between the ends of the bundling bar 13 as necessary, the bundling band 1
It is possible to keep the distance between the reinforcing bars 1 accurately over the entire length of 3. At this time, the mounting position and the number of the intermediate spacers 14 are not particularly limited.

FIG. 4 shows a modification of the intermediate spacer 14 described above. Intermediate spacer 17 shown in FIG.
Is the reinforcing bar 1 on the side portion between the four protruding ends 18.
Is provided with a curved seat portion 19 that matches a part of the peripheral surface shape. Then, as shown in FIG. 5, each bar-shaped reinforcing bar 1 is fixed to the intermediate spacer 17 by binding the periphery of the bundling bar 13 with, for example, a metal winding wire 20.

Such an intermediate spacer 17 has an advantage that it can be installed very easily as compared with the intermediate spacer 14 shown in FIG. In addition, such an intermediate spacer 14,
17 is preferably formed of cast iron or a processed product.

The bundling streak 13 thus constructed is
Although a number of conventional rebars of normal size are bundled, they are apparently arranged as one rebar. As a result, the concrete can easily enter between the reinforcing bars 1 in the bundling bars 13 and exhibit a predetermined anchoring, and as a result, the strength equivalent to that of using a reinforcing bar having a large diameter can be exhibited.

In the spacer according to the embodiment of the present invention described above, four conventional reinforcing bars are bundled, but the present invention is not limited to this, and the number of reinforcing bars to be bundled is not limited to this. It goes without saying that a spacer having an appropriate shape in which a corresponding number of screw holes are formed on both end surfaces can be used.

[0019]

As described above, according to the spacer for the bundling bar of the present invention, the conventional rebars of the normal size can be bunched while maintaining an accurate mutual interval, and at the same time, as a bundling bar joint. Can also work. Furthermore, by using the bundling bar configured in this way as an apparently single reinforcing bar, it is possible to improve the strength without increasing the cross-sectional area of the RC structure, and for that purpose, it is possible to increase the strength of a custom-made product. It is possible to suppress an increase in the cost of the reinforcing bar as compared with the conventional case where the reinforcing bar is used.

[Brief description of drawings]

FIG. 1 is a perspective view showing a spacer for bundling muscles according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a bundling bar configured by using the bundling bar spacer of the embodiment shown in FIG.

FIG. 3 is a perspective view showing an intermediate spacer that is appropriately arranged on the bundling muscle shown in FIG.

FIG. 4 is a perspective view showing another modified example of the intermediate spacer arranged on the bundling streak shown in FIG.

5 is a cross-sectional view showing a state where reinforcing bars are arranged and fixed to the seat portion of the intermediate spacer shown in FIG.

FIG. 6 is a cross-sectional view of a case where conventional rebars of a normal size are simply bundled.

[Explanation of symbols]

 1 Conventional bar-shaped rebars of regular size 10 Spacer for bundling bar 11a Projection part 11b Projection part 11c Projection part 11d Projection part 12 Screw hole 13 Bundling bar 14 Intermediate spacer 15a Projection part 15b Projection part 15c Projection part 15d Projection part 16 Through hole 17 Intermediate Spacer 18 Projecting End 19 Seat 20 Winding Wire

Claims (1)

[Claims] 1. A spacer for use in a bundled bar in which a plurality of bar-shaped reinforcing bars are bundled at a predetermined distance from each other and arranged in concrete, wherein each end screw part of the plurality of bar-shaped reinforcing bars is screwed. A plurality of screw holes to be attached together are formed in the axial direction from predetermined positions on both end faces, and each end screw part of each bar-shaped reinforcing bar constituting the bundling bar is screwed into each screw hole from both end face sides. A spacer for a bundling bar, characterized in that the bundling bars are connected to each other and the distance between the bar-shaped reinforcing bars is maintained.