JPH08261216A - Threaded coupling for deformed reinforcing bar - Google Patents

Abstract

PURPOSE: To provide a deformed reinforcing bar threaded coupling facilitating easy manufacturing even when reinforcing bars having short full lengths and small diameters. CONSTITUTION: A box nut 11 is welded to the end surface of a reinforcing bar 10 in one side, a bolt 21 is welded to the end surface of a reinforcing bar 20 in the other side and the reinforcing bars in both sides are connected to each other by thrusting the bolt 21 into the nut 11, or by welding the nut 11 to the end surface of the reinforcing bar in the other side as well, the nuts in both sides are connected to each other via the bolt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved joint for deformed reinforcing bars.

[0002]

2. Description of the Related Art As a conventional deformed bar joint, a crimp type joint is known from Japanese Patent Publication No. 55-45295. The crimping type joint is that half of the long nut-shaped body is externally press-fitted to the ends of the reinforcing bars on both sides, the long nut-shaped bodies on both sides are screwed on both sides of the bolt, and the spanner part at the center of the bolt is It was the method of turning and joining the reinforcing bars. However, the crimp type joint has a problem that the total length of the joint is too long because two long nut-shaped bodies are connected in series.

Further, in the case of a screw rebar, a long nut-shaped main body having a screw thread and a groove for fitting with a screw cap of the rebar, and a lock nut fixed by being screwed onto the rebar from both sides of the main body. Threaded joints have traditionally been used. Since this joint requires lock nuts on both sides, the number of parts is large, and if the reinforcing bar becomes thin, for example, if the reinforcing bar becomes thinner than D13 (nominal diameter 12.7 mm), the height of the screw cap is small. However, there is a problem that it is difficult to manufacture the joint body.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a joint suitable for deformed bar, which has a short overall length,
It is to provide a material applicable to small-diameter reinforcing bars.

[0005]

Means for Solving the Problems In order to achieve the above object, the means adopted by the present invention is such that one end of one reinforcing bar is screwed with an axially longer bag-shaped nut, and the other end of the reinforcing bar is screwed into the bag-shaped nut. Either the bolts are welded and fixed, or the axially longer bag-shaped nuts are welded and fixed to the end faces of both the reinforcing bars, and the bag-shaped nuts on both sides are connected by the bolts.

[0006]

The closed end face of the bag-shaped nut is coaxially welded to the end face of the reinforcing bar on one side, and the bolt to be screwed into the bag-shaped nut is coaxially welded to the end face of the reinforcing bar on the opposite side. Alternatively, the closed end faces of a bag-shaped nut having the same diameter and the same length are coaxially welded to the end faces of the reinforcing bars on both sides, and a double-length bolt of the nut is screwed into the bag-shaped nut on one side to project from the open end face of the nut. By screwing the bolt welded to the reinforcing bar on the other side into the bag-shaped nut welded to the reinforcing bar on one side, or screwing the bolt screwed into the bag-shaped nut welded to the reinforcing bar on one side to the bag-shaped nut welded to the reinforcing bar on the other side. It is possible to easily connect the reinforcing bars on both sides by screwing. Bag-shaped nuts and bolts are easy to manufacture even if the reinforcing bar has a small diameter, the same type can be used for several types of reinforcing bars with different diameters, and the total length is shorter than conventional ones. , Expands applications.

[0007]

Embodiment 1 In the first embodiment shown in FIG. 1A, a closed end face 12 of a bag-shaped nut 11 is coaxially welded to an end face of a deformed bar 10 on one side, and a head is attached to an end face of a deformed bar 20 on the opposite side. The bolt 21 of the screw shaft is coaxially welded. The total length of the bolt 21 is substantially equal to the total length of the bag nut 11.

As shown in FIG. 1 (b), when the bolt 21 welded to the rebar 20 on the opposite side is screwed from the open end surface 13 of the bag-shaped nut 11 welded to the rebar 10 on one side, the rebars 10 and 20 on both sides are separated. Connecting. In this case, the total length of the bag-shaped nut 11 corresponds to the length of the joint, but since the total length of the bag-shaped nut 11 is shorter than that of the conventional joint, the bag-shaped nut 11 can be used in places where it could not be used until now. Also, when the diameter of deformed bar is different,
Since the same bag nut and bolt can be used within a certain range, the cost of the joint is significantly reduced.

In the second embodiment shown in FIG. 2A, the closed end faces 12 of the cap nuts 11 and 11 'are provided on the end faces of the deformed reinforcing bars 10 and 20 on both sides.
12 'is coaxially welded, and a bolt 21 having a total length about twice that of the bag-shaped nut is screwed into the bag-shaped nut 11 on one side and projected from the open end surface 13. As shown in FIG. 2B, a bolt 21 protruding from the open end surface 13 of the bag-shaped nut 11 welded to the reinforcing bar 10 on one side and a cap-shaped nut welded to the reinforcing bar 20 on the opposite side.
When 11 'is screwed into the open end face 13', the reinforcing bars 10 and 20 on both sides are connected. The length of the joint of this embodiment is twice the total length of the bag-shaped nut, which is longer than that of the joint of the above-mentioned embodiment, but only the bag-shaped nut is welded to the end face of the reinforcing bar, so that the cost of the joint is large. Fall to.

[0010]

As described above, according to the joint of the present invention, bag-shaped nuts are welded to the end faces of the deformed reinforcing bars on both sides to connect the rebars on both sides via bolts, or the end faces of the deformed reinforcing bars on one side are connected to each other. -Shaped nut is a method in which a bolt is welded to the end surface of the deformed bar on the opposite side, and the bolt is screwed into the nut to connect the bar on both sides. Compared with the screw crimp type joint, the overall length is significantly shorter, which has the advantage of diversifying applications. Further, as compared with the conventional threaded joint for threaded reinforcing bars, there is an advantage that a small diameter one can be easily manufactured, and the number of parts is reduced because a lock nut is not required.

[Brief description of drawings]

FIG. 1 is a side view of a joint according to a first embodiment of the present invention,
(A) shows the state before connection and (b) shows the state after connection.

2 (a) and (b) are FIG. 1 (a) of the second embodiment,
It is a figure equivalent to (b).

[Explanation of symbols]

 10: Reinforcing bar, 11: Cap nut, 12: Closed end face, 13: Open end face, 20: Reinforcing bar, 21: Bolt, 22: Closed end face, 23: Open end face

Claims (2)

[Claims] 1. A closed end face (12) is provided on an end face of a reinforcing bar (10) on one side.
A threaded joint for deformed reinforcing bars, comprising a bag-shaped nut (11) coaxially welded with and a bolt (21) coaxially welded to the end surface of the reinforcing bar (20) on the opposite side. 2. A cap nut (11, 11 ') in which closed end faces (12, 12') are welded to the end faces of the reinforcing bars (10, 20) on both sides, and screwed into the cap nut (11) on one side. Its open end face (1
3) A bolt (2
1) A deformed rebar threaded joint characterized by consisting of