JPH09242262A - Connecting fixture of deformed bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection by having end parts of deformed bars to be connected opposed to each other, by inserting the end part of one of the deformed bars to a narrow bar entrance of a cylindrical connector and by inserting and spiraling the other deformed bar into the other narrow bar entrance. SOLUTION: A connecting fixture is formed by a cylindrical connector 1 consisting of both edges 2a and 2b, symmetrical with a clearance between them, and a cylindrical body 1a having narrow bar entrance, and a spiral to externally fasten the both edge 2a and 2b. Then, end parts of deformed bars X to be jointed are opposed to each other with an appropriate interval, and the end of one of the deformed bars X is inserted into the narrow bar entrance by expanding the clearance of the cylindrical connector 1, and the other deformed bar X is also inserted into the other of the cylindrical connector 1. A projection 9 of the deformed bar X is fitted into a groove 7 of the narrow bar entrance and fixed by tightening and fixing the edge 2a and 2b of the cylindrical connector 1 with a spiral for tightening. Thus, joint work of arranging bars can be drastically streamlined, and a term of works can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting for joining deformed steel bars.

[0002]

2. Description of the Related Art Deformed bar steel, which is widely used as a reinforcing bar, is generally made of high-strength steel and therefore cannot be welded by ordinary welding. It is carried out by heating sufficiently and by pressing both ends with a hydraulic jack or the like.

[0003]

However, since this pressure welding work requires skill and the working environment is severe, it is becoming difficult to secure the personnel necessary for this work recently. In addition, this type of work is susceptible to the weather (it cannot be performed outdoors in rainy weather or in strong winds), and the shortage of workers mentioned above causes the construction period to increase and construction costs to rise. The fact is that this is one factor.

Further, in the pressure welding method, since the ends of the steel bars are contracted by about 10 mm due to the pressure welding, there is a problem that joining of the steel bars in a restrained state cannot be performed. Therefore, if the deformed steel bar inside the beam is mistakenly cut when repairing a building, etc., the rebar cut by the pressure welding method cannot be rejoined, and there is no other joining method that can be applied. In the end, the reality is that you have to leave it as it is. Further, as described above, in the pressure welding method, since the ends of the steel bars are contracted by about 10 mm respectively, the so-called auxiliary bars cannot be arranged unless the main bars of the deformed steel bars are pressure-welded during the bar arrangement. The workability was poor.

The present invention has been made in view of the above problems. It is possible to easily join deformed steel bars without the conventional pressure welding, and it is also easy to join deformed steel bars in a restrained state. It is intended to provide a joining metal fitting that can be made to.

[0006]

In order to achieve such an object, the metal fitting of the present invention is a tubular body composed of a one-piece body having two edges and having a vertically divided gap between the edges. There
Each end side consists of a connecting cylinder that forms a steel bar narrowing portion for inserting the deformed steel bars to be joined and a pressing spiral that externally tightens the edge of this connecting cylinder. It is characterized in that a groove into which the projection of the deformed steel bar is fitted is formed on the inner surface of the insertion portion.

Since the connecting cylinder body is a member that receives the tensile force applied to the deformed steel bar, it is preferable that the connected cylinder body is made of steel having a tensile strength equal to or higher than that of the deformed steel bar. The total radial cross-sectional area of the body is preferably equal to or larger than the radial cross-sectional area of the deformed steel bar.

[0008]

[Function] The ends of the deformed steel bars to be joined are made to face each other with an appropriate interval, and one end of the deformed steel bars is expanded into the vertically divided gap of the connecting cylinder body, and is inserted into the steel bar narrowed-in portion. Insert the deformed steel bar into the other end of the connecting cylinder. At this time, the projection of the deformed steel bar is fitted into the groove of the steel bar narrowing portion. In this way, with the ends of the steel bars sandwiched, the spiral for externally tightening the connecting cylinder is tightened to complete the joining.

When a tensile force is applied to the joint portion by such a joint metal fitting, the pressing spiral restrains the connecting cylinder body and suppresses the connecting cylinder body from trying to spread to the outside. The projection of the bar that has been fitted does not come off from the groove, and therefore the deformed bar does not come off from the connecting cylinder. When the material and cross-sectional area of the connecting cylinder are set to the same level as or larger than those of the deformed steel bar, high strength against tensile force can be obtained when applied to a reinforcing bar or the like.

[0010]

1 to 5 show an embodiment of the present invention. FIG. 1 is a front view showing a state where steel bars are joined, and FIG. 2 is a sectional view taken along line AA in FIG. 3 is a vertical cross-sectional view in a state where steel bars are joined, FIG. 4 is an exploded perspective view, and FIG. 5 is a cross-sectional view of a connecting cylinder.

The joint metal fitting a according to the present invention has the two gaps 2a. 2b and a tubular body 1a including a tubular body 1a having a steel bar narrowing portion, and a spiral 4a for externally tightening both edge portions. The tubular body 1a of the former coupling tubular body 1 is tubular, and the inside of each end side is a steel bar narrowing portion 10 into which a deformed steel bar to be joined is inserted. A groove 7 into which the circumferential projection 9 of the deformed steel bar is fitted is formed in the inner circumferential direction of the steel bar narrowing portion 10. In addition, the edge 2a. A hole 5 into which a spiral 4a for externally tightening the connecting cylinder 1 is fitted is formed in 2b. The inner diameter of the tubular body 1a of the connecting tubular body 1 is configured to be the same as or slightly larger than the outer diameter of the deformed steel bars to be joined.

The projection of the deformed steel bar is not so high in dimensional accuracy. In addition, the projection 9 in the circumferential direction of the deformed steel bar is shown in FIG.
As shown in (4), since there is often a gap in the direction extending along the axial projection 9 ', the groove 7.7' is
It is preferable to make the width wider than the width of the projection 9 of the deformed steel bar. Further, since the connecting cylinder 1 is a member that receives the tensile force applied to the deformed steel bar X, it is preferable that the connected cylindrical body 1 is made of steel having a tensile strength equal to or higher than that of the deformed steel bar X, and for the same reason. It is preferable that the total radial cross-sectional area of the connecting tubular body is equal to or larger than the radial cross-sectional area of the deformed steel bar X.

The edge portion 2a. 2b is constituted by a spiral 4a that is externally tightened. In this example,
A screwing means is constituted by the spiral 4a in the hole 5 for pressing the edge portion. However, the structure of the tightening means is not limited to the above, and may be any suitable structure capable of externally tightening the connecting cylinder 1.

Further, the shape of the connecting cylindrical body 1 is not limited to the cylindrical body, and may have an appropriate sectional shape.

According to the above-mentioned joining metal fitting, the ends of the deformed steel bars X to be joined are opposed to each other with an appropriate interval, and the ends of one deformed steel bar X are placed in the gap 3 of the connecting cylinder 1. Expand and insert into the steel bar narrowing portion 10, and insert one deformed steel bar X in the same manner. At this time, the projection 9 of the deformed steel bar X is fitted in the groove 7 of the steel bar narrowing portion 10. With the ends of the steel bars sandwiched in this manner, the edge portions 2a. The tightening spiral 4a for externally tightening 2b is tightened to complete the process.

In the joining metal fitting of the present invention, the projection 9 of the deformed steel bar fits into the groove 7 of the steel bar narrowing portion 10, and the edge 2a. If the tightening spiral 4a is fastened to 2b, even if the bar steel is restrained in a state where the projection 9 of the deformed steel bar X is displaced by one mountain, and if the bar steel is restrained, the end portion of the deformed steel bar X is completely removed. There is no problem if you do not contact them.

In the joint portion by such a joint fitting, even when the deformed steel bar X is subjected to a tensile force, the pressing tightening spiral 4a is connected to the edge portion 2a. 2b is restrained and the tubular body 1a is restrained from expanding outward. Therefore, the bar steel projection 9 fitted in the groove 7 of the steel bar narrowing portion 10 does not come off from the groove 7, and therefore the deformed bar X Does not come off from the connecting cylinder 1. Therefore, by setting the material and cross-sectional area of the connecting cylinder 1 to the same level as or more than that of the deformed steel bar X, a high strength against tensile force can be obtained when it is applied to a reinforcing bar or other joining application. .

Incidentally, the joining metal fitting of the present invention is suitable for joining deformed steel bars which are reinforcing bars, but in addition to this, a joining tool for using deformed steel bars as tie rods in dam construction, port construction, etc. Etc. can be used for all joining applications of deformed steel bars.

According to the present invention described above, it is possible to easily carry out the work of joining deformed steel bars without using pressure welding as in the prior art. For this reason, especially the work of joining the reinforcing bar materials can be carried out in comparison with the prior art. It can be rationalized significantly, shortening the construction period and reducing the construction cost. Further, since the deformed steel bars in a restrained state can be easily joined to each other, the invention can be applied to the joining of the reinforcing bars inside the existing beam. In addition, there is an advantage that the main bar can be joined after the auxiliary hood 0 is arranged also in the bar arrangement.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a front view of a state in which steel bars are joined.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a vertical sectional view of the metal fitting shown in FIG.

FIG. 4 is an exploded perspective view of the metal fitting shown in FIG.

5 is a cross-sectional view of the metal fitting shown in FIG.

FIG. 6 is a perspective view showing an example of a deformed steel bar.

[Description of sign]

1. ... Connecting cylinder pair, 1a. ... Tubular pair, 2a. 2b
... Edges, 3. ... Gap, 4a. ... Pressing spiral, 5. ... Spiral hole, 7. ... Grooves, 9. ... Protrusions, 10. ... Bar steel narrow-fitting part,

Claims (2)

[Claims] 1. A steel bar comprising a one-part body having two edges and having a vertically-spaced gap between the edges, each end side of which is filled with a deformed steel bar to be joined. It consists of a connecting cylinder that constitutes the narrow insertion part and a pressing spiral that externally tightens the edge of this connecting cylinder.There is a groove on the inner surface of each steel bar narrowing part of the previous connection cylinder where the projection of the deformed steel bar fits. Formed deformed bar steel fittings. 2. The connecting cylinder is made of steel having a tensile strength equal to or higher than that of the deformed steel bars to be joined, and the total radial cross-sectional area of the connecting cylinder is equal to or larger than the radial cross-sectional area of the deformed steel bar. The joining bracket for deformed steel bars according to claim 1, wherein