JPS60199151A - Welding joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a welding joint for connecting steel bars such as reinforcing bars.

[Prior art]

Conventionally, as shown in Fig. 6, a plurality of through holes (2) (2
a) Cylindrical welded joint with IIFI (2b02c) (
1) is used to weld and connect reinforcing bars (3) and (3a) (Utility Model Application No. 16523/1983).

The above joint (1) has two reinforcing bars (3) inserted at both ends of the joint.
) (3a) at the center of the joint (1), and
) and the reinforcing bars (3) (3a), and then the through holes (
2) While welding the hole edges and reinforcing bars of (2c), each hole (2)
It is used by filling it with molten metal (4) as shown in fIS7 diagram.

[Problems with conventional technology]

However, in the case of the above joint (1), the through holes (2) to (2C
) are required to be provided at equal intervals in the circumferential direction of the joint, so the high heat generated when filling the through holes (2) to (2C) with molten metal (4) causes the joint ( It was found that there was a problem in that the entire circumference of the joint (1) became red hot and the metal wires changed, and the hot type g part covered almost the entire circumference of the joint (1), making the joint easy to break.

Furthermore, the lower through hole (2a) is welded before the upper through hole (2a) is welded.
Since there is a risk that molten metal may fall from b), it is also necessary to fill the lower through hole (21+) with a dowel (5), which is time-consuming.

[Means to solve problems]

The present invention is characterized in that a welding through hole (2) 5111 is provided at only one location on the outer periphery of the metal cylinder (11).

[Action and effect]

Since the hole only needs to be filled in one place, the side opposite to the hole is not affected by the heat, which prevents a decrease in the strength of the joint itself, and greatly reduces the time required for melting. There is no need to pay money to prevent this.

The present invention will be specifically described below with reference to embodiments shown in the drawings.

〔Example〕

The welded joint of the example (1 n is external 251 screw reinforcing bar (
() (3a) Although this is for joining, it is not limited thereto and can of course be applied to welding joints of various steel bars.

L welded joint (1) is an external 4511II11 metal pipe (lO) with an inner diameter of approximately 30 m +n and approximately 6011I+
The metal tube (11) is cut into a length of 6 mm, and a through hole (2) for welding is provided at only one location in the approximately medium heat portion of the peripheral wall of the lens tube.

Of course, the through hole (2) in I-1'i can be made in a circular shape with a drill, or it can be made into a circular shape with an end mill etc. as shown in Fig. 4.
A long hole extending in the axial direction;

Transfer the N number of gold M A'J to the slide table in a row horizontally, and make a rectangular through hole (2) in each metal cylinder as shown in Fig. 5. It is possible.

However, for the joint (1) with the welding hole (2) facing -L, reinforcing bars (for threading) are installed at both ends of the joint (1).
:3) Insert (3a) and insert the reinforcing bar (30
FAllll to the extent that the melting rod can be moved during 3a),
In the example! ! The ends of the reinforcing bars should face each other with an interval of about 51 cm.

Next, both ends of the joint (1) and both reinforcing bars (3) (:Ja) are welded, and the gap between the butts of the reinforcing bars is filled by welding, and the entire circumference of the edge of the through hole (2) and the reinforcing bars ( ])(:ia)
The hole (2) is filled with molten metal (4) while welding.

In the case of the example, the joint (
]) has ample inner diameter, so even if the tip of the reinforcing bar is slightly bent, the joint will not break out, and the gap between the reinforcing bar and the inner surface of the joint will also be filled with molten σ, increasing the strength of the XK joint. .

As described above, the present invention has one 1'1 through hole (2) for welding (+ tear color, 4 (, <2) (n lx t
t Ill'l +hr ti r8 Almost unaffected by Rf & temperature, bt is υ [Rice bone, dog and f.

The deterioration in joint strength caused by the extensive heat-affected zone caused by opening multiple through-holes and filling all m1 through-holes with welding is avoided, and the high-strength joint portion is improved.
Completed and finished.

Furthermore, since the opposite side of the T5 two-shell tracing hole (2) is closed, the molten fL does not fall out, and there is no need to use a dowel as in the conventional method, which has excellent effects.

It goes without saying that the present invention is not limited to the above configuration, and that various modifications can be made within the technical scope of the claims.

[Brief explanation of the drawing]

Figure m1 is a slope view of the welded joint, Figure 2 is a cross-sectional view of the welded joint and reinforcing bars, and Figure fiS3 is Figure fiS2 ■-II.
The sectional view along the f line, ttS4, is the slope I1 of another example.
．． Figure 5 is a slope view of the embodiment, Figure 6 is a slope view of the conventional example,
FIG. 7 is a sectional view of a conventional example.

Claims (1)

[Claims] ■ For the gold fin (11) which is open at both ends into which the ends of the two steel bars to be welded are fitted, there is only one through hole (2) for welding approximately in the center of the front wall of the metal tube. A welding joint characterized by being opened.