JP2607157Y2 - Coupler nut for rebar connection - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupler nut for connecting a threaded rebar.

[0002]

2. Description of the Related Art As a conventional joint device for connecting reinforcing bars, there is known a joint device disclosed in Japanese Utility Model Laid-Open No. 1-154218. As shown in FIG. 2, this coupling device includes a coupler nut 10 and a pair of lock nuts 20. The coupler nut 10 has a polygonal bulge 11 on the outer periphery of a central portion, and a screw hole 13 penetrating along the axial direction is formed inside. Bulge 1
1 has a grout injection hole 14 communicating with the screw hole 13.
There is formed through in the radial direction.

[0003] In the joint device having the above-described configuration, a pair of threaded rebars A having the same diameter are screwed into the screw holes 13 of the coupler nut 10 and connected in a straight line. In this connected state,
A pair of lock nuts 20 previously screwed to the reinforcing bar A
Is tightened toward the end face of the coupler nut 10 using a tool such as a wrench, so that
Is strongly fixed to the coupler nut 10. When tightening the lock nut 20, the coupler nut 1
Reference numeral 0 indicates that the bulging portion 11 is engaged and held by another tool such as a spanner. Thereafter, grout material M is injected from the grout injection hole 14 with an injection gun, so that the screw holes 13 and 2 of the coupler nut 10 and the lock nut 20 are formed.
3 is filled with a grout material M between the inner peripheral surface and the outer peripheral surface of the reinforcing bar A, and the coupler nut 10, the lock nut 20, and the reinforcing bar A are filled.
And thus the connection strength between the pair of reinforcing bars A is increased.

[0004]

[Problems to be Solved by the Invention] The Coupler Nut 1
When 0 was used, the following inconveniences occurred during grout filling operation. That is, as shown in FIG. 2, when a relatively large gap is formed between the end faces of the reinforcing bar A,
The injected grout material M accumulates in this gap and is equalized in pressure, and proceeds in the left-right direction in the figure. However, when the end faces of the reinforcing bars A are closer to each other and the gap between them is reduced or completely eliminated, the injected grout material M advances in the left and right directions without equalization. For example,
When the pressure of the grout material M traveling toward the left direction is higher than the pressure of the grout material M traveling toward the right direction, the grout material M quickly overflows from the left end face of the left lock nut 20, and this overflow occurs. Is left until it comes time to overflow from the right end face of the right lock nut 20. The grout material M is injected by the operator when both lock nuts 2 are used.
When the grout material M overflows from the end face of the nut 0, the grout material M is coupled with the coupler nut 10 and the two lock nuts 20.
This is because the process is continued until it is confirmed that all are filled. For this reason, the grout material M is wasted, and there is a drawback that other components are soiled.

The present invention has been made in view of the above circumstances, and a coupler nut capable of equalizing the grout material at the center and completing the grout material filling at substantially the same time on both sides. The purpose is to provide.

[0006]

In order to achieve the above object, according to the present invention, a screw hole is formed inside the screw hole so as to penetrate along the axial direction, and a pair of screws having the same diameter are formed in the screw hole. By screwing together the reinforcing bars, in a tubular coupler nut that connects these reinforcing bars on the same straight line,
With grouting hole penetrating the central portion peripheral wall in the radial direction is formed, an annular groove communicating with the grout injection hole formed on the inner peripheral surface of the central portion peripheral wall, the annular groove is it the
By separating the holes, a pair of
Of the annular groove, the inner diameter of the annular groove, the pair of
It is characterized by being larger than the inner diameter of the valley of the hole .

[0007]

According to the first aspect of the present invention, since the grout material injected from the grout injection hole temporarily accumulates in the annular groove and is equalized, the speed of the grout material traveling left and right from the annular groove becomes substantially the same. At about the same time, the filling of the grout material in the right and left portions of the coupler nut is completed. As a result, waste of the grout material can be eliminated, and other constituent members do not have to be soiled. Moreover, the inner diameter of the annular groove is a pair of holes.
Since the diameter of the grout is larger than the inner diameter of the valley, it is possible to fill the annular groove with a sufficient amount of the grout material while maintaining a high pressure and to equalize the pressure. This allows the grout material to be
Ensure that both ends of the coupler nut are reached at the same time
And ensure that it reaches the entire circumference of each end at the same time.
Can be reached, and the time to reach
Can be shorter.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the following embodiments, the same reference numerals are given to portions common to the configuration described in the related art, and redundant description will be omitted.

In the coupler nut 10 of this embodiment, an annular groove 15 is formed on the peripheral wall of the central bulging portion 11. This annular groove 15 is continuous with the grout injection hole 14 . this
The screw hole 13 is formed by the annular groove 15 so that the hole portion 13a on the left end side is formed.
And a hole 13b on the right end side. Annular groove 15
Is the inner diameter of the valleys of these holes 13a and 13b.
Bigger. The width of the annular groove 15 (the length of the coupler nut 10 in the axial direction) is about the same as or slightly larger than the screw pitch of the screw hole 13, and is about twice the width of the thread of the reinforcing bar A or slightly larger.

In the above configuration, after the connection of the reinforcing bar A by the coupler nut 10 and the two lock nuts 20 is completed, the grout material M is injected from the grout injection hole 14 by applying pressure by the injection gun 30. At this time, even if the gap between the end faces of the pair of reinforcing bars A is small or not at all, the grout material M temporarily accumulates in the annular groove 15 and is equalized here. Almost simultaneously with the hole portions 13a and 13b, and each hole portion
Injected almost simultaneously around the entire circumference of 13a, 13b,
Drive at approximately the same speed to the left and right. As a result, the screw hole 1 of the coupler nut 10 left part and the left lock nut 20
Grout material M between the inner peripheral surface of 3,23 and the outer peripheral surface of rebar A
The time when the filling of the grout material M is completed between the inner peripheral surfaces of the screw holes 13 and 23 of the coupler nut 10 right side and the right lock nut 20 and the outer peripheral surface of the reinforcing bar A is substantially the same as the time when the filling of the grout material M is completed. Matches. In other words, the time when the grout material M overflows from the left end face of the left lock nut 20 substantially coincides with the time when the grout material M overflows from the right end face of the right lock nut 20. Moreover, each lock nut 20
Grout material M overflows almost simultaneously over the entire circumference of.
The operator can use the grout material M from the end faces of both lock nuts 20.
Spilling out at about the same time, the coupler nut 10
Immediately after confirming that the grout material M has been filled over the entire length of the lock nut 20 and the left and right lock nuts 20, the work of injecting the grout material M is stopped. Therefore, the grout material M is not wasted, and other components are not stained by the grout material M. Also, the ring in the annular groove 15
Since the pressure of the route material M can be kept high, the filling time can be assured.
It can be really short.

The present invention is not limited to the above-described embodiment, and various embodiments are possible. For example, a lock nut for tightening to a coupler nut may be omitted in some cases.

[0012]

As is apparent from the above description, according to the first aspect of the present invention, the grout material injected from the grout injection hole accumulates in the annular groove and is equalized. The filling of the grout material on both sides of the nut is completed. As a result, the grout material can be filled over the entire length of the coupler nut, the waste of the grout material can be eliminated, and other components are not stained with the grout material. Moreover, the inner diameter of the annular groove is
Since the diameter of the grout is larger than the inner diameter , a sufficient amount of the grout material can be reliably filled in the annular groove while maintaining a high pressure, and the pressure can be equalized. This allows grouting of Kaprana
Can be reached simultaneously at both ends of the
Make sure that the end
And ensure that the time to reach
Can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where rebars are connected using a coupler nut according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which reinforcing bars are connected using a conventional coupler nut.

[Explanation of symbols]

 A Reinforcing bar 10 Coupler nut 13 Screw hole 14 Grout injection hole 15 Annular groove 20 Lock nut 30 Injection gun

Claims (1)

(57) [Scope of request for utility model registration] A screw hole is formed inside the screw hole and extends along the axial direction. A pair of screws having the same diameter is screwed into the screw hole to connect the reinforcing bars on the same straight line. In the cylindrical coupler nut, a grout injection hole penetrating in the radial direction is formed in the central peripheral wall, and an annular groove connected to the grout injection hole is formed on the inner peripheral surface of the central peripheral wall , and this annular groove is formed. Above
By separating the holes, a pair of
Of the annular groove, the inner diameter of the annular groove, the pair of
A coupler nut for connecting reinforcing bars, wherein the coupler nut is larger than an inner diameter of a valley portion of a hole portion .