JP2003278316A - Coupler for mechanical joint for reinforcement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupler for a mechanical joint for a reinforcement enabling easy recognition as to whether a reinforcement length of an inserted part inside the coupler is sufficient or not as a joint for the reinforcement from the appearance of the joint after connection of the reinforcement. <P>SOLUTION: In this coupler 1 for a cylindrical joint connecting two thread reinforcements 3 and 3 together, a through hole 2 allowing visual check of end faces 3a and 3a of the two thread reinforcements inserted into opening parts in both ends from the outside is arranged in the vicinity of the longitudinal direction center part of the coupler 1. The through hole 2 is formed into a slit extending from the center of the coupler 1 to both end parts. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupler used in a mechanical joint for reinforcing bars.

[0002]

2. Description of the Related Art Reinforcing bar joints include lap joints, gas pressure joints, weld joints, mechanical joints, etc. Among them, mechanical joints include torque fixing type, grout filling type, sleeve crimping type, etc. . Further, unlike the gas pressure welding joint and the welded joint, the mechanical joint does not require a device for generating a high degree of skill, thermal power, electric power, etc. in the construction, and is therefore known as a reinforced joint construction method that is easy to construct.

In order to confirm whether or not the joint has been properly installed, the lap length can be visually confirmed in the lap joint, and the appearance of the crimp portion or the weld portion of the joint in the gas pressure welded joint or the welded joint can be confirmed. Can be visually confirmed. On the other hand, in the mechanical joint, since the rebars are joined by inserting each end of the pair of rebars into a tubular coupler, the length of the part of the rebars inserted into the coupler is a joint of rebars. It is not possible to confirm from the appearance of the joint whether or not the length is sufficient. Therefore, it has been confirmed that a reinforcing bar having a predetermined length is inserted into the coupler by marking the reinforcing bar and inserting the reinforcing bar to the marked position in the coupler.

[0004]

However, since it is necessary to mark all the reinforcing bars, there is a problem that the construction of the joint is very inefficient. Therefore,
The present invention solves the problems of the prior art as described above, whether the length of the portion of the rebar inserted in the coupler is a sufficient length as a joint of the rebar, the joint after joining the rebar An object of the present invention is to provide a coupler for mechanical joints, which can be easily confirmed from the appearance of.

[0005]

In order to solve the above-mentioned problems, the present invention has the following constitution. That is, the coupler for a mechanical joint of a reinforcing bar of the present invention is a tubular coupling coupler for mechanically connecting two reinforcing bars, and the end faces of the two reinforcing bars inserted into the openings at both ends are externally connected. A through hole that can be visually confirmed is provided in the vicinity of the central portion in the longitudinal direction of the coupler.

The shape of the through hole is preferably a slit shape extending in the longitudinal direction from the central portion of the coupler toward both end portions. Since the coupler has the above through holes, the end faces of the two reinforcing bars inserted into the openings at both ends of the coupler can be visually confirmed from the outside of the coupler, and it can be inserted into the coupler of the reinforcing bar. It is possible to visually confirm whether or not the length of the marked portion is long enough for the joint of the reinforcing bar. Therefore, it is possible to easily confirm whether or not the mechanical joint of the reinforcing bar has been properly constructed, that is, it is possible to easily perform quality control of the joint and finding of a defective construction.

The coupler may also be called a long nut or a sleeve depending on the type of mechanical joint.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a coupler for a mechanical joint of a reinforcing bar according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing one embodiment of a coupler for mechanical joint of reinforcing bar of the present invention (a view seen from the longitudinal direction of the coupler), and FIG. 2 shows two reinforcing bars using the coupler of FIG. It is a top view which shows the structure of the joined mechanical joint.

First, the structure of the coupler 1 will be described. The coupler 1 has a tubular shape, and a spiral thread groove is formed on the inner peripheral surface 1a thereof. The outer peripheral surface 1b of the illustrated coupler 1 has a hexagonal shape, but the shape of the outer peripheral surface 1b is not particularly limited. A through hole 2 penetrating from the outer peripheral surface 1b to the inner peripheral surface 1a is provided at the center of the coupler 1 in the longitudinal direction. The shape of the through hole 2 is from the center of the coupler 1 in the longitudinal direction to both ends. It has a slit shape extending in the longitudinal direction.

Next, using such a coupler 1, 2
A method of joining the screw reinforcing bars 3 and 3 of the book will be described. The ends of the two screw rebars 3 are inserted into the openings at both ends of the coupler 1. At this time, the screw-shaped convex portion 3b provided on the outer surface of the screw reinforcing bars 3 and 3 is inserted while being screwed into the thread groove of the inner peripheral surface 1a of the coupler 1. Since the through hole 2 is provided in the coupler 1 as described above, the end surfaces 3a, 3a of the inserted screw reinforcing bars can be visually confirmed from the through hole 2. Therefore, while confirming that the length of the part of the threaded reinforcing bar 3 that is inserted into the coupler 1 is a length that sufficiently functions as a joint of the reinforcing bar, the work of inserting the threaded reinforcing bars 3 and 3 should be performed. You can

The length of the through hole 2 in the longitudinal direction is such that the end faces 3a, 3a of the screw rebar are located when the screw rebars 3, 3 are inserted into the coupler 1 by a length sufficient to function as a joint for the rebar. It suffices that the through hole 2 extends, and it is not necessary to reach the vicinity of the end of the coupler 1. After inserting the screw rebars 3 and 3 by the required length,
The lock nuts 4 and 4 screwed onto 3 are positioned at both ends of the coupler 1. Then, torque is applied to the lock nuts 4 and 4 to fix the coupler 1, and the construction of the mechanical joint is completed.

[0012] In this way, the end face 3 of the screw rebar inserted
Since a and 3a can be visually confirmed from the through hole 2 of the coupler 1, a high quality mechanical joint can be surely constructed. Further, the quality inspection of the joint can be easily performed after the construction (it is easy to find the construction defect). However, since the coupler 1 and the screw reinforcing bar 3 are substantially the same color system, in the part where a plurality of screw reinforcing bars 3 are intricate,
It may be difficult to visually confirm the end face 3a of the screw reinforcing bar from the through hole 2 of the coupler 1. In such a case, at least the peripheral portion of the outer peripheral surface 1b of the coupler 1 is colored by applying a paint or the like to the peripheral portion of the through hole 2, and if the colors of the coupler 1 and the screw reinforcing bar 3 are changed, the coupler 1 and the screw reinforcing bar 3 Since the difference with 3 is visually clear, the end face 3a of the screw rebar
It becomes easy to visually confirm from the through hole 2. As a color to be colored, primary colors such as red and yellow are preferable. The same effect can be obtained by coloring the end portion of the screw reinforcing bar 3 instead of the outer peripheral surface 1b of the coupler 1, and different colors can be applied to both the outer peripheral surface 1b of the coupler 1 and the end portion of the screw reinforcing bar 3. By coloring, the difference between the coupler 1 and the screw reinforcing bar 3 becomes more visually clear.

The present embodiment is an example of the present invention, and the present invention is not limited to this embodiment. For example, in the present embodiment, the through hole 2 has a slit shape, but the through hole 2 is inserted into the openings at both ends.
The shape is not particularly limited as long as the end surfaces 3a, 3a of the screw reinforcing bars of the book can be visually confirmed from the outside, and a circular shape, an elliptical shape, a polygonal shape, or the like may be used.

The number of the through holes 2 may be one, but may be plural. Furthermore, in the present embodiment, an example in which the present invention is applied to a fixed torque mechanical joint has been described, but it goes without saying that the present invention can also be applied to other types of mechanical joints without any problem. For example, the present invention is also applicable to a grout filling type joint for injecting grout material into a gap between a coupler (sleeve) and a reinforcing bar, a sleeve crimping type joint for crimping a sleeve to a node of the reinforcing bar, and the like.

[0015]

As described above, the coupler for mechanical joint of reinforcing bar of the present invention is, whether the length of the portion of the reinforcing bar inserted in the coupler is sufficient as a joint for reinforcing bar, It is possible to easily visually confirm from the appearance of the joint after joining the reinforcing bars. Therefore, it is possible to easily perform quality control of joints and find defective construction.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a coupler for a mechanical joint of a reinforcing bar of the present invention.

FIG. 2 is a plan view showing the configuration of a mechanical joint using the coupler for mechanical joint of reinforcing bar of the present invention.

[Explanation of symbols]

1 coupler 2 through holes 3 screw rebar 3a End face of screw rebar

Claims (2)

[Claims] 1. In a tubular coupling coupler for mechanically connecting two reinforcing bars, the end faces of the two reinforcing bars inserted into the openings at both ends can be visually confirmed from the outside. A coupler for a mechanical joint of a reinforcing bar, wherein a through hole is provided in the vicinity of a central portion in the longitudinal direction of the coupler. 2. The coupler for a mechanical joint of a reinforcing bar according to claim 1, wherein the through hole has a slit shape extending in the longitudinal direction from the central portion of the coupler toward both ends.