JPH10175075A - Joining method of bar like body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join bar like bodies of a reinforcing rod, etc., irrespective of fine or rainy weather and having sufficient as well as uniform strength. SOLUTION: Small pieces 2 of the same material as a bar like body 6 attached with inactive small pieces 3 on both sides, which are gasified at high temp., are sandwiched to butting parts of the bar like bodies 6, further, a shield 4 is covered over the butting end part of each bar like body 6 and an assembly is set in an U shaped jig, under this state, an electrode chuck 5 of a stud welding machine is mounted to the small piece 2, an other electrode is connected to the jig 1, while each bar like body 6 is pressed each other, the stud welding machine is energized for a prescribed time to fill a molten metal in an inner space of the shield 4, after cooling, the shield is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining rod-shaped members such as deformed reinforcing bars having a printed portion (bamboo node) used for constructing a building such as a building or a bridge in the longitudinal direction. .

[0002]

2. Description of the Related Art Conventionally, as a method of joining deformed reinforcing bars, there has been known a gas pressure welding method in which abutting portions of deformed reinforcing bars are pressed while being heated by a gas flame.

[0003]

The gas pressure welding method described above is very difficult to perform under rainy weather. In addition, since the worker performs the work manually, the finished strength and the like are not uniform, and the strength is often insufficient.

An object of the present invention is to enable a rod-shaped body such as a deformed reinforcing bar to be joined with sufficient and uniform strength irrespective of fine weather.

[0005]

According to the method of joining rods according to the present invention, a small piece of the same material as a rod having an inert mass 3 gasified at a high temperature on both sides at a butted portion of a rod 6 is provided. 2, and the shield 4 is put on the butted end of each rod 6 and set on the U-shaped jig 1. In this state, the electrode chuck 5 of the stud welding machine is attached to the small piece 2, and the jig 1 The other electrodes are connected to each other, and the stud welding machine is energized for a predetermined time while the rod-shaped members 6 are pressed against each other to fill the inner space of the shield 4 with the melt, and the shield 4 is removed after cooling.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to FIG. 1, an embodiment of a method for joining rods according to the present invention will be described.

[0007] In this joining method, a metal jig 1 for maintaining a rod-shaped body 6, 6 made of iron or the like having a diameter of 10 to 50 mm in a lengthwise butting state, and a metal jig 1 between the butted portions of the rod-shaped body 6, 6. A small piece 2 of the same material as the rod 6 to be made, and inert small pieces 3 and 3 which are gasified at a high temperature, such as an aluminum bowl;
Shields 4, 4 surrounding the ends of each bar 6
And a stud welding machine (not shown) having a negative pole connected to the jig 1 and a positive pole electrode chuck 5 sandwiching the periphery of the small piece 2, and the respective rod-shaped members 6, 6 being applied to each other simultaneously with melting of the butted portion. A hydraulic device (not shown) for pressing is used. First, these will be described in order.

The jig 1 has a U-shape, and is provided at both ends with a hole through which the bar 6 can be inserted, or a chuck capable of holding the bar 6 therebetween. As described above, the negative electrode of the stud welding machine is connected to the jig 1.

The small piece 2 is made of the same material as the rod 6 and has a circular cross section. However, due to welding efficiency,
Deformation such as providing a projection at the center of the disc-shaped body is allowed.

The inert small mass 3 is embedded in each surface of the small piece 2 and is gasified when the stud welding machine is energized to cover the welding surface, thereby blocking air containing oxygen and preventing oxidation of the welding surface. Things.

The shield 4 is made of graphite, wood ceramic or the like. Its shape is a cylindrical shape in which the inside diameter of the tip is larger than the other parts. The space of the large diameter portion has a cross-sectional area of about 1.5 times that of the rod 6 to be joined, and the inner diameter of the small diameter portion on both sides thereof is substantially equal to the outer diameter of the rod 6 to be joined. The shield 4 is removed after the rods 6, 6 have been joined.

The stud welding machine generates an arc between a tip of a bolt or the like and a base material and presses and welds, and is widely known. The stud welding machine used here has a constant voltage and includes a timer for setting the energization time. In the method of joining rods,
The energizing time is set so that the heating temperature becomes 1400 to 1600 ° C. Also, the positive electrode chuck 5 is
It is made of two semi-circular members that can be opened and closed, and is configured to be in close contact with the periphery of the melt 2 when sandwiched.

The hydraulic device includes a position fixing holding member capable of holding and opening the rod 6 and a moving holding member capable of holding and opening the rod 6 and movable by hydraulic pressure with respect to the position fixing holding member. It is provided with.

Next, a description will be given of a method of joining rods using the above-described tool or device.

First, the two rod-shaped members 6 are assembled to the jig 1 in a state of abutting each other, and are further set by sandwiching between a position fixing holding member and a moving holding member of the hydraulic device. At that time, both rods 6
The small pieces 2 with the inert small blocks 3 are sandwiched between them, and the butting ends of the rods 6 are covered with the shields 4 respectively. After the above setting is completed, the electrode chuck 5 which is a positive pole of the stud welding machine is attached to the small piece 2, and the negative pole is connected to the jig 1. Then, when the hydraulic devices are actuated to press the rods 6, 6 together and switch on the arc stud welding machine at the same time, the arc starts, the end of each rod 6 and the small piece 2 begin to melt, and The activated nodules 3 are gasified. This gas covers the welding surface and blocks air containing oxygen, thereby preventing oxidation of the welding surface. The melt of the end of each rod 6 and the small piece 2 is applied to the shield 4 by the pressing force of the hydraulic device.
Is filled without gaps, and the cross-sectional area of that portion becomes 1.5 times the cross-sectional area of the rod-shaped body 6. Then, the energization of the stud welding machine is stopped by the timer, the molten portion is cooled, and the two rods 6 are integrated. Finally, the shield 4 is broken and removed, and the jig 1 and the hydraulic device are removed to complete a series of operations. The tensile strength of the joint by this method is
Since it is equal to or greater than that of the base material, it does not break at the joint.

When joining deformed reinforcing bars by this method,
Since the deformed reinforcing bars 6 have bamboo nodes, even if the deformed reinforcing bars 6 and 6 are strongly pulled, the deformed reinforcing bars 6 do not fall out of the coating layer, and the tensile strength of the joint is further increased.

[0017]

Since the present invention is configured as described above, it has the following effects.

That is, since the strength of the joint is very high, and the voltage and energizing time of the stud welding machine can be kept constant, the melting temperature is stable and the construction is easy even for a non-skilled engineer. The strength of the joint is constant. Also, it is possible to join deformed reinforcing bars having different thicknesses. Furthermore, since the working time is short and the use assisting member is inexpensive, it is economical and can be easily implemented anywhere with a power supply.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of the vicinity of a butted portion of a rod-like body for explaining a joining method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Jig 2 Small piece 3 Inactive small mass 4 Shield 5 Electrode chuck of stud welding machine 6 Rod

Claims (1)

[Claims] 1. A small piece of the same material as a rod-shaped body on both sides of which an inert small mass gasified at a high temperature is sandwiched between butted parts of the rod-shaped bodies, and a shield is put on the butted end of each rod-shaped body. The jig is attached to the small piece, the other electrode is connected to the jig, and the rods are pressed against each other for a predetermined time to the stud welding machine. A method of joining rods that energizes the melt to fill the interior space of the shield and removes the shield after cooling.