JP3999435B2 - Steel bar joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing bar joint structure arranged on a concrete structure or foundation, and more particularly to a reinforcing bar joint structure with a lock function that can be supplied at a low cost.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, the joint structure of reinforcing bars arranged in structures such as reinforced concrete is connected to a nut member screwed in the left and right threads from the center, and one of them is connected to the right end screwed in the right end. The other end is screwed with a rebar that is to be connected with a left-hand thread at the tip, and a lock nut is arranged in a double nut type for each nut member, so that it does not loosen at the joint part Was so concluded. Alternatively, the direction of the screw may be right-handed screws or left-handed screws.
[0003]
However, in any case, in the case of the above configuration, since the male screw is screwed to the long reinforcing bar, the price becomes expensive, and the nut member is also provided with a right screw from one end of the nut member. Since the left-hand screw is screwed from the other end, the processing becomes complicated and expensive.
[0004]
Therefore, the cost of the reinforcing bar for reinforced concrete work such as buildings, dams or road piers that require a large number of joint structures has been considerably high.
[0005]
The present invention has been made in view of the present situation, and an object thereof is to provide a rebar joint structure that is inexpensive and highly reliable.
[0006]
[Means for Solving the Problems]
The joint structure of a reinforcing bar according to the present invention is formed such that a nut member having a female thread formed on an inner peripheral surface is joined by a pair of friction welding, and a portion melted by the friction welding protrudes from the inner circumferential surface of the joint. With
A screw part having a male screw formed on the outer periphery is joined to the tip of the reinforcing bar body by friction welding, and the reinforcing bar having the male screw is inserted from both sides of the nut member and screwed together.
[0007]
Therefore, according to the joint structure of the reinforcing bar constructed as described above, the internal thread portion can be easily and efficiently manufactured by a normal nut manufacturing process, and the external thread portion is also short. It can be easily and efficiently manufactured by simply manufacturing a normal bolt on a small-sized member. Commercially available mass-produced products can also be used. Since these screwed portions (female screw and male screw portion) can form a nut member or a reinforcing bar having a male screw at the tip by friction welding, it can be manufactured very easily and inexpensively. And since it is friction welding, the whole joining surface fuse | melts and it can acquire very high reliability in a joining part. In addition, when the melted part protrudes from the inner peripheral surface of the frictionally welded nut member, it is possible to effectively prevent a situation where one of the reinforcing bars is screwed excessively so that it protrudes from the center of the nut member to the opposite side. A configuration that can be prevented can be easily realized.
[0008]
Further, in the above-mentioned reinforcing bar joint structure, by forming an enlarged portion having a large effective diameter to the extent that the male screw can be inserted as compared with other portions in the insertion portion of the male screw on the nut member side, torque is generated in this portion. Increases to perform a lock function. Therefore, the reinforcing bar joint structure according to this configuration does not require a lock nut.
[0009]
Furthermore, in the above-mentioned reinforcing bar joint structure, when the male screw and the female screw are round screws, the screw size management becomes easy, so that the screw can be manufactured at a low cost, and smooth screwing can be realized at the time of screwing. Become.
[0010]
Further, in the above-mentioned reinforcing bar joint structure, both of the male screws screwed from both sides of the nut member are right-handed screws or left-handed screws, and the female screws on both sides constituting the nut member are both right-handed screws or left-handed screws. Since both can use the same thing, it becomes the structure which can be implemented more cheaply by the mass production effect.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the joint structure of a reinforcing bar according to an embodiment (example) of the present invention will be specifically described with reference to the drawings.
[0012]
FIG. 1 is a partially sectional side view showing a joint structure according to the present embodiment.
In the figure, reference numeral 1 denotes a nut member, and this nut member 1 is joined by friction welding the two members physically having a female screw 1a made of a right-hand thread on the inner peripheral surface. Yes. In the case of this embodiment, in the friction welding part, a part of the melted part protrudes to the outer peripheral side of the friction welding part. The female screw 1a is a round screw as a screw type. And although the said female screw 1a is manufactured by a tap, you may manufacture by another method.
On the other hand, in FIG. 1, reference numeral 2 denotes a reinforcing bar to be connected, in which a screw 2 a is screwed on the outer periphery of a tip end (screw portion) 2 </ b> A. The distal end portion 2A is integrally joined to the reinforcing bar body 2B on the proximal end side by friction welding. The male screw 2a is a right-hand screw that engages with the female screw 1a. The screw type is a round screw. The portion of the male screw 2a that engages with the nut member 1 is slightly dimensional (for example, the screw diameter is about 13 mm and is about 5/100 mm to 1/10 mm). Although not appearing, a portion 2b whose effective diameter is increased within the extent of being deformed and screwed into the female screw 1a is formed. In the case of this embodiment, the enlarged portion 2b is formed at a position to be screwed to the outer end portion of the nut member 1 in a state of being screwed to the nut member 1 side. In this embodiment, the male screw 2a is manufactured by rolling.
[0013]
Thus, according to the joint structure of the present reinforcing bar thus configured, the nut member 1 is manufactured by joining two physically identical members by friction welding, and a short member is rolled. Then, the male screw 2a is formed and then integrally joined to the rebar main body 2B side by friction welding. Therefore, the male screw can be formed by a small device (tapping device, rolling device), and thus manufactured at low cost. be able to.
In addition, since the joining portion is joined by friction welding, the entire joining surface is melted compared to the case where the joining is integrally performed by ordinary electric welding or the like, and extremely high strength and reliability are obtained at the “joining point”. Obtainable.
[0014]
Further, instead of the above embodiment, as shown in FIG. 2, the portion protruding to the outer peripheral side at the time of friction welding at the central portion in the longitudinal direction of the nut member 1 can be deleted. The appearance will be beautiful. In addition, on the inner peripheral surface of the center of the nut member 1, a part that is intentionally melted and protruded by friction welding is formed so that one of the reinforcing bars 2 is excessively screwed to the screwed part of the other reinforcing bar 2. You may comprise so that it may not match.
[0015]
Furthermore, as another embodiment having an adjusting function with respect to the length of the reinforcing bar, as shown in FIG. 3, one member 1A constituting the nut member 1 is lengthened, and a male screw 2a screwed into the member 1A. If the lock nut 3 is screwed onto the male screw 2a, the above-mentioned length is adjusted so as to match the length of the reinforcing bar. The rebar having the male screw 2a to which the lock nut 3 is screwed is screwed to the nut member 1 that joins the rebars, and the lock nut 3 is fixed at that position. As in the embodiment of FIG. 1, the male thread 2a of one reinforcing bar is the same in that a portion 2b having a large effective diameter is formed in part. In the embodiment of FIG. 3, the same components as those in FIG.
[0016]
【The invention's effect】
According to the reinforcing bar joint structure of the present invention, it is possible to provide a reliable reinforcing bar joint structure at low cost.
[Brief description of the drawings]
FIG. 1 is an overall side view, partly in section, showing the structure of a reinforcing bar joint structure in an embodiment of the present invention.
FIG. 2 is a partial side view showing a configuration of a nut portion according to another embodiment different from FIG.
FIG. 3 is a partial sectional side view showing a configuration of a reinforcing bar joint structure according to an embodiment different from the embodiment of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Nut member 1a ... Female screw 2 ... Reinforcing bar 2A ... Tip part (screw part)
2a …… Male screw 2B …… Rebar main body

Claims (4)

A nut member having a female thread formed on the inner peripheral surface is joined by a pair of friction welding, and a part melted by the friction welding is protruded from the inner circumferential surface of the joint ,
Reinforcing bar characterized in that a screw part having a male screw formed on the outer periphery is joined to the tip of the main part of the reinforcing bar by friction welding, and the reinforcing bar having the male screw is inserted from both sides of the nut member and screwed together. Fitting structure.   2. The reinforcing bar joint structure according to claim 1, wherein a diameter-enlarged portion having a larger effective diameter than the other portion is formed in an insertion portion of the male screw on the nut member side.   3. The reinforcing bar joint structure according to claim 1, wherein the male screw and the female screw are round screws.   The male screws screwed from both sides of the nut member are both right-handed screws or left-handed screws, and the female screws on both sides constituting the nut member are both right-handed screws or left-handed screws. Item 4. The reinforcing bar joint structure according to any one of items 1 to 3.

Images