JPH0842063A - Equipment and method of connecting reinforcing bar and joint for connecting reinforcing bar - Google Patents

Abstract

PURPOSE:To increase the tensile strength of connecting sections when two reinforcing bars are connected by a welding system. CONSTITUTION:Both end sections in the longitudinal direction of a joint 10 are provided as a pair of storage sections 11, and holes 12 for welding extended along the longitudinal direction are formed in the circumferential walls of each storage section 11. A weld metal 16 is buried into the holes 12 for welding by inserting an electrode for an arc welding machine into the holes 12 for welding and conducting arc discharge under the state that the end sections of a pair of deformed reinforcing bars 1 are stored in these storage sections 11, the joint 10 and the outer circumferential surfaces of each reinforcing bar 1 are welded, thus linearly combining the reinforcing bars 1 mutually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for linearly connecting a pair of reinforcing bars and a joint used for this connection.

[0002]

2. Description of the Related Art Welding is one of the methods for connecting deformed rebars at a construction site of a reinforced concrete building. In the conventional welding method, the holding metal fitting 50 as shown in FIG. 6 is used. The holding metal fitting 50 has a pair of cylindrical housing portions 51 and a connecting portion 52 that connects the housing portions 51. By accommodating the end portions of the pair of reinforcing bars 1 in the pair of accommodating portions 51 of the holding metal fitting 50, the reinforcing bars 1 are aligned linearly. After this, rebar 1 by arc welding etc.
Weld each other. That is, the electrode rod of the arc welding machine is melted and embedded between the end faces of the reinforcing bar 1.

[0003]

In the above-mentioned conventional method, since the weld metal 55 is embedded between the end faces of the reinforcing bar 1 and welded, the welding area is limited to the area of the end face of the reinforcing bar 1 to enhance the welding strength. In some cases, the tensile strength was not sufficient and the tensile strength was particularly insufficient. Generally, in reinforced concrete, since the reinforcing bar bears the tensile load, the tensile strength at the connecting portion of the reinforcing bar 1 is particularly important, and improvement has been desired.

[0004]

The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 is a device for linearly connecting a pair of deformed reinforcing bars.
A sleeve-shaped joint having accommodating portions for accommodating the ends of the pair of reinforcing bars on both sides, and welding holes formed in the peripheral walls of the accommodating portions, and (b) filling the welding holes of the joint. And a weld metal that connects the reinforcing bar and the joint to each other. The invention according to claim 2 is a method of linearly connecting a pair of deformed reinforcing bars, comprising: (a) a pair of accommodating portions on both sides in the longitudinal direction, and welding holes are formed in the peripheral walls of these accommodating portions. Prepare a sleeve-like joint made by
The ends of the pair of reinforcing bars are respectively accommodated in the pair of accommodating portions of the joint, a part of the outer peripheral surface of the reinforcing bar is exposed from the welding hole, and (c) the electrode rod of the arc welding machine is inserted into the welding hole of the joint. Is inserted and arc discharge is performed to melt the electrode rod and fill the welding hole to weld the reinforcing bar and the joint. The invention of claim 3 is
A joint used for linearly connecting a pair of deformed reinforcing bars, having a sleeve shape, and having a pair of accommodating portions for accommodating the ends of the pair of reinforcing bars on both sides in the longitudinal direction. It is characterized in that welding holes are formed in the peripheral walls of these accommodating portions. According to a fourth aspect of the present invention, in the reinforcing bar connecting joint according to the third aspect, the welding hole extends in the longitudinal direction. The invention of claim 5 relates to claim 4
In the joint for connecting the reinforcing bars according to the item (1), the welding holes of the pair of accommodating portions are connected to each other in a straight line. According to a sixth aspect of the present invention, in the reinforcing bar connecting joint according to any of the third to fifth aspects, a plurality of the welding holes are formed at equal angular intervals in the circumferential direction of the accommodating portion.

[0005]

In the inventions of claims 1 to 3, the welding area is determined by the area of the welding hole and is not limited to the area of the end face of the reinforcing bar, so that the welding area can be made large. Moreover, a meshing structure of the weld metal embedded in the welding hole and the rib of the deformed bar can be obtained. For these reasons, the tensile strength at the reinforcing bar connecting portion is significantly improved. In claim 4,
Since the welding holes extend in the longitudinal direction of the joint, the welding area can be increased without reducing the tensile strength of the joint itself. When using an arc welder,
Since welding can be performed while moving the electrode rod along the welding hole, workability can be improved. In the present invention, since the welding holes of the pair of accommodating portions are connected in a straight line, when the arc welding machine is used, welding can be performed while moving the electrode rod along the connecting welding holes. Therefore, workability can be further improved. In the sixth aspect, since the welded portions have the same angular interval in the circumferential direction, the tensile load can be evenly distributed, and the tensile strength can be further improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. An iron (metal) joint 10 is prepared for connecting the deformed bars 1. This joint 10
It has a sleeve shape, and left and right halves of the joint 10 (both sides in the longitudinal direction) are provided as a pair of accommodating portions 11. Two welding holes 12 are formed in the peripheral wall of each accommodation portion 11. These welding holes 12 are shown in FIG.
As shown in FIG.
They are formed 0 ° apart, and as shown in FIGS. 1 and 2,
It extends in the longitudinal direction of the joint 10.

The ends of the pair of reinforcing bars 1 are housed in the pair of housing portions 11 of the joint 10, respectively. As a result, the pair of reinforcing bars 1 are arranged in a straight line. In this state, a part of the outer peripheral surface of the reinforcing bar 1 is exposed from the welding hole 12. In addition,
The end faces of the reinforcing bar 1 may contact each other or may be separated from each other.

Next, as shown in FIG. 2, with the tip of the electrode rod 15 of the arc welding machine inserted into one end of the welding hole 12, the welding hole 12 is welded along the welding hole 12 while arcing. Move to the other end of 12. As a result, the electrode rod 15
Is melted and filled in the welding hole 12. With the weld metal 16 thus formed, the joint 10 and each rebar 1
Are welded to each other, and the reinforcing bars 1 are connected to each other via the joint 10. The welding operation can be easily performed by moving the electrode rod 15 in the longitudinal direction of the joint 10.

In the above connecting device, since the welding area, that is, the total area of the welding holes 12 can be made much larger than the area of the end face of the reinforcing bar 1, the welding strength becomes large and the reinforcing bar 1
It is possible to improve the strength against a tensile load acting in the longitudinal direction. Further, since the meshing structure of the weld metal 16 embedded in the welding hole 12 and the rib 1a of the deformed bar 1 is obtained, the tensile strength can be greatly improved also from this point. Further, since the welded portions are separated by 180 °, the tensile load can be evenly distributed, and from this point also, the tensile strength can be improved. Since the welding hole 12 extends in the longitudinal direction, the cross-sectional area is not significantly reduced over the entire length of the joint 10, and therefore the welding area can be increased without significantly reducing the tensile strength of the joint 10 itself. it can.

The present invention is not limited to the above-mentioned embodiment, and various modes are possible. For example, as shown in FIG.
In each of the accommodating portions, four welding holes 12 may be formed at 90 ° intervals, and the weld metal 16 may be embedded in each of them. Three or five or more welding holes 12 may be formed at equal angular intervals in the circumferential direction. Further, as shown in FIG. 4, the welding holes 12 of the pair of accommodating portions 11 may be connected to form a straight elongated hole 19. In this case, since the pair of reinforcing bars 1 and the joint 10 can be welded at once by moving the electrode rod of the arc welding machine along the long hole 19, the welding work can be further improved. It is preferable to form a plurality of the long holes 19 at equal angular intervals in the circumferential direction, as in the above embodiment.

The connection device and connection method of the present invention are shown in FIG.
As shown in, it is used when connecting the precast concrete 5. The precast concrete 5 is made by embedding a reinforcing cage 7 in concrete 6. Rebar cage 7
Is a shear reinforcing bar 2 around a plurality of deformed bars 1 as main bars.
It is constructed by arranging and binding. The ends of the deformed reinforcing bars 1 as the main bars project from the concrete 6, and the ends are connected by the connecting device and the connecting method of the present invention. The present invention is also applied to the connection of reinforcing bars in the state of reinforcing bar cages.

[0012]

As described above, according to the inventions of claims 1 to 3, the welding area can be made large, and furthermore, the meshing structure of the weld metal and the ribs of the deformed bar can be obtained. The tensile strength at the connecting portion can be greatly improved. According to the fourth aspect, the welding area can be increased without decreasing the tensile strength of the joint itself and the welding workability can be improved. In claim 5,
Welding workability can be further improved. According to the sixth aspect, since the tensile load can be evenly distributed, the tensile strength can be further improved.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a reinforcing bar connecting device of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3A is a sectional view taken along the line III-III in FIG. (B) is a cross-sectional view of a modified example.

FIG. 4 is a side view showing a modified example of the welding hole formed in the joint.

FIG. 5 is a schematic side view showing an example to which the connecting device of the present invention is applied.

FIG. 6 is a side view showing a conventional reinforcing bar connecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Reinforcing bar 1a ... Rib 10 ... Joint 11 ... Storage part 12 ... Welding hole 15 ... Arc welding machine electrode rod 16 ... Welding metal 19 ... Long hole

Claims (6)

[Claims] 1. A device for linearly connecting a pair of deformed reinforcing bars, comprising: (a) a housing for housing the ends of the pair of reinforcing bars on both sides, for welding to the peripheral walls of these housings. A reinforcing bar connecting device, comprising: a sleeve-like joint formed with a hole; and (b) a weld metal that is embedded in the welding hole of the joint and connects the reinforcing bar and the joint. . 2. A method of linearly connecting a pair of deformed reinforcing bars, comprising: (a) a pair of accommodating portions on both sides in the longitudinal direction, and welding holes are formed in the peripheral walls of these accommodating portions. (B) The ends of the pair of rebars are housed in the pair of housings of the joint, respectively, and a part of the outer peripheral surface of the rebar is exposed from the welding hole. An electrode rod of an arc welding machine is inserted into the welding hole of the joint, and by performing arc discharge, the electrode rod is melted and filled in the welding hole, thereby welding the rebar and the joint. Reinforcing bar connection method. 3. A joint used for linearly connecting a pair of deformed reinforcing bars, which has a sleeve shape and has a pair of ends for accommodating the ends of the pair of reinforcing bars on both sides in the longitudinal direction. A joint for connecting reinforcing bars, characterized in that it has accommodating parts, and welding holes are formed in the peripheral walls of these accommodating parts. 4. The reinforcing bar connecting joint according to claim 3, wherein the welding hole extends in the longitudinal direction. 5. The reinforcing bar connecting joint according to claim 4, wherein the welding holes of the pair of accommodating portions are aligned with each other. 6. The reinforcing bar connecting joint according to claim 3, wherein a plurality of the welding holes are formed at equal angular intervals in the circumferential direction of the accommodating portion.