JP2014004605A - Member for weld joint and method for jointing reinforcing bar using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for weld joint, capable of jointing a bar stock such as a reinforcing bar, readily and reliably.SOLUTION: The member 1 for weld joint is curved in a circular arc-shape so as to follow outer peripheries of ends of two bar stocks 10, 10 to be jointed and capable of performing butt welding by filling a weld metal 20 between the two bar stocks 10, 10 disposed at curved inner surfaces. A groove part 4 capable of accommodating the weld metal 20 is formed at the curved inner surfaces 2, 2 so as to be extended along a curve direction. The groove part 4 includes a pair of side wall surfaces 4a, 4a continuing to the curved inner surfaces 2, 2 orthogonal to each other in the cross-section surface thereof.

Description

  The present invention relates to a welded joint member used for butt welding rods such as reinforcing bars, and further relates to a method for joining reinforcing bars using the welded joint member.

  As a conventional welded joint member, for example, a configuration disclosed in Patent Document 1 is known. This welded joint member is formed by curving a rectangular plate material so that the end surface is arcuate, and a groove portion extending in the circumferential direction is formed at the substantially longitudinal center of the inner surface. As shown in FIG. 5, on both sides of the weld joint member 50, the end portions of the two reinforcing bars 60, 60 are respectively arranged so as to leave a gap immediately above the groove portion 52, and the weld metal 70 is placed in the gap. By being filled, the reinforcing bars 60 are joined together.

JP-A-8-267291

  In the conventional welded joint member 50, in the cross section parallel to the axis of the reinforcing bars 60, 60, the groove 52 is arcuate, while the end surfaces of the reinforcing bars 60, 60 are linear, and the shape is discontinuous between them. Part has arisen. For this reason, a weld defect such as a crack after the rebar 60, 60 and the weld metal 70 are melted easily occurs in the vicinity of the discontinuous portion. Therefore, depending on the skill level of the welder, as shown in an enlarged view in FIG. 6, a welding defect D in the vicinity of the discontinuous portion N may occur not in the groove portion 52 but between the reinforcing bars 60, 60. There was a risk of a decrease in strength.

  Therefore, an object of the present invention is to provide a welded joint member that can easily and reliably join bars such as reinforcing bars and a method for joining reinforcing bars using the same.

  The object of the present invention is curved in an arc shape along the outer periphery of the ends of two bars to be joined, and butt welding is performed by filling a weld metal between the two bars disposed on the curved inner surface. A groove for accommodating a weld metal is formed on the curved inner surface so as to extend along a bending direction, and the groove is formed in a cross section with the curved inner surface. This is achieved by a welded joint member having a pair of side wall surfaces that are orthogonal to each other.

  In this welded joint member, the groove is preferably formed such that the pair of side wall surfaces rises from the bottom wall surface, and has a corner at the boundary between the pair of side wall surfaces and the bottom wall surface.

  In addition, the object of the present invention is to use the above-described welded joint member so that the ends of the two reinforcing bars are spaced from the curved inner surface so that the respective end surfaces are flush with the pair of side wall surfaces. This is achieved by a method for joining reinforcing bars, which includes a step of arranging a gap and a step of filling the gap including the inside of the groove with a weld metal.

  ADVANTAGE OF THE INVENTION According to this invention, the member for welded joints which can perform joining of bar materials, such as a reinforcing bar easily and reliably, and the joining method of a reinforcing bar using the same can be provided.

It is a top view of the member for welded joints concerning one embodiment of the present invention. It is a front view of the member for welded joints shown in FIG. It is sectional drawing for demonstrating the joining method of the bar using the member for welded joints shown in FIG. It is a principal part enlarged view of FIG. It is sectional drawing of the welding joint by the member for conventional welding joints. It is an expanded sectional view for demonstrating the welding defect of the welding joint using the member for conventional welding joints.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 are a plan view and a front view of a welded joint member according to an embodiment of the present invention, respectively. As shown in FIGS. 1 and 2, the welded joint member 1 has a shape in which a strip-shaped steel plate is curved along the longitudinal direction so as to follow the outer periphery of the end of a bar 10 such as a reinforcing bar to be joined. The end of the bar 10 is held to the curved inner surface 2 and has a length that can be welded (for example, a length that covers about a half circumference of the bar 10). In the center of the curved inner surface 2, a groove portion 4 extending along the bending direction is formed. In order to improve workability after assembling of the reinforcing bars joined using the welded joint member 1 on the outer peripheral surfaces on both sides of the grooved part 4 in the welded joint member 1, a smoothly curved curved part (or chamfered) Part) 6 and 6 are formed.

  The groove part 4 has a pair of side wall surfaces 4a and 4a and a bottom wall surface 4b, and is formed in a rectangular shape in the AA cross section (see FIG. 3A) in FIG. In this cross section, the pair of side wall surfaces 4a and 4a are connected so as to be orthogonal to the curved inner surfaces 2 and 2, and the pair of side wall surfaces 4a and 4a and the bottom wall surface are erected vertically from the bottom wall surface 4b. Corners 4c and 4c are provided between 4b and 4b. This groove portion 4 is formed so that both ends in the bending direction are open to the end face of the weld joint member 1 and the groove depth is constant over the entire bending direction of the curved inner surface 2. The width of the groove portion 4 is substantially equal to the interval between the rod members when the rod members 10 are butt welded (for example, about 8 mm), and has a size capable of accommodating the weld metal inside the groove portion 4. The groove part 4 can be formed by cutting etc., for example.

  Next, a method for joining bars using the welded joint member 1 having the above-described configuration will be described with reference to FIG. FIG. 3 is a cross-sectional view parallel to the axial direction of the rods 10 and 10 to be joined, and corresponds to the AA cross section of FIG. First, as shown in FIG. 3 (a), two bars 10, 10 such as rebars are arranged on both sides of the groove 4 of the weld joint member 1, and the axis of these bars 10, 10 is The ends of the bars 10 and 10 are held on the curved inner surfaces 2 and 2 so as to match. Thereby, the mutually opposing end surfaces 12 and 12 of the bars 10 and 10 are parallel to the pair of side wall surfaces 4a and 4a, respectively, and the end surfaces 12 and 12 are flush with the pair of side wall surfaces 4a and 4a. As a result, a gap S having a width substantially the same as the width of the groove 4 is formed between the end faces 12 and 12.

  Then, by inserting a welding wire into the gap S and forming a weld metal from the inside of the groove portion 4 as in the prior art, as shown in FIG. The weld metal 20 melted together is filled in the gap S including the inside of the groove portion 4, and the bars 10, 10 are joined together by the weld metal 20 and integrated with the weld joint member 1. The filling of the weld metal 20 into the groove 4 and the gap S can be performed using, for example, a carbon dioxide semi-automatic welding machine, but is not particularly limited, and various conventional welding methods can be applied. .

  Since the member 1 for welded joints of this embodiment has a pair of side wall surfaces 4a and 4a which the groove part 4 formed in the curved inner surfaces 2 and 2 continues so as to be orthogonal to the curved inner surfaces 2 and 2 in cross section. As shown in FIG. 3A, the end surfaces 12 and 12 of the bar members 10 and 10 and the pair of side wall surfaces 4a and 4a can be flush with each other, and the shape becomes discontinuous between them. Can be avoided. Therefore, it is possible to prevent the occurrence of welding defects such as cracks, which are likely to occur immediately after the start of welding, in the vicinity of the boundary between the rods 10, 10 and the groove portion 4, and to promote the occurrence position of the welding defect in the groove portion 4. Since it can do, generation | occurrence | production of the welding defect between the bar materials 10 and 10 can be prevented reliably.

  Moreover, the groove part 4 of the member 1 for welded joints of this embodiment is formed so that a pair of side wall surface 4a, 4a may stand up from the bottom wall surface 4b, and a pair of side wall surface 4a, 4a and the bottom wall surface 4b The boundary is not smoothly curved but is provided with corners 4c and 4c. Therefore, as shown in an enlarged cross-sectional view in FIG. 4, the welding defects D and D in the initial stage of welding can be easily generated from the corner portions 4 c and 4 c, so that the generation of welding defects between the rods 10 and 10 occurs. Can be prevented more reliably. The depth of the groove portion 4 is preferably such that the welding defects D and D generated from the corner portions 4c and 4c as starting points do not reach between the rods 10 and 10, for example, 2 mm or more. . The shape of the corners 4c and 4c may be sharp enough to be the starting point of the welding defects D and D when the welding defects D and D are generated in the groove 4, and inevitably occurs when the groove 4 is formed. It does not exclude the resulting fine curved shape.

DESCRIPTION OF SYMBOLS 1 Member for welded joint 2 Curved inner surface 4 Groove part 4a Side wall surface 4b Bottom wall surface 4c Corner | angular part 10 Bar material 20 Weld metal D Weld defect S Crevice

Claims (3)

A welded joint that is curved in an arc shape along the outer periphery of the ends of the two bars to be joined, and can be butt welded by filling a weld metal between the two bars arranged on the curved inner surface A member for
On the curved inner surface, a groove that can accommodate a weld metal is formed so as to extend along the bending direction,
The groove portion is a welded joint member having a pair of side wall surfaces that are continuous with the curved inner surface so as to be orthogonal to each other in cross section. The groove portion is formed such that the pair of side wall surfaces rise from the bottom wall surface,
The welded joint member according to claim 1, wherein a corner portion is formed at a boundary between the pair of side wall surfaces and the bottom wall surface. A method for joining reinforcing bars using the welded joint member according to claim 1,
Arranging the ends of the two reinforcing bars with a gap in the curved inner surface such that each end surface is flush with the pair of side wall surfaces;
And a step of filling the gap including the inside of the groove with a weld metal.

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