JP5064840B2 - Ultrasonic flaw detection inspection method for welded joints - Google Patents

Ultrasonic flaw detection inspection method for welded joints Download PDF

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JP5064840B2
JP5064840B2 JP2007055155A JP2007055155A JP5064840B2 JP 5064840 B2 JP5064840 B2 JP 5064840B2 JP 2007055155 A JP2007055155 A JP 2007055155A JP 2007055155 A JP2007055155 A JP 2007055155A JP 5064840 B2 JP5064840 B2 JP 5064840B2
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常雄 原頭
喜三 目黒
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原頭工業株式会社
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本発明は、鉄筋コンクリート構造物等に用いる鉄筋の溶接方法に関しており、より詳細には、溶接継手に対する超音波探傷検査を好適に行えるように、サイズが異なる２本の鉄筋を突合せ溶接する方法に関する。   The present invention relates to a method for welding reinforcing bars used in reinforced concrete structures and the like, and more particularly, to a method for butt welding two reinforcing bars having different sizes so that an ultrasonic flaw detection inspection can be suitably performed on a welded joint.

以前、出願人は、図１３に示す金属製の裏当て材(継手スリーブ)(101)を用いた鉄筋の溶接継手工法と、当該工法を用いて形成された溶接継手に対して行われる超音波探傷検査法とを提案した(特許文献１)。さらに、出願人は、このような溶接継手に対して好適に用いられる超音波探傷検査法も提案した(特許文献２)。特許文献１に開示された溶接継手工法は、ニューＮＴ工法(商標登録第４２３５６０３号)と称されて、出願人によって実施されている。また、特許文献１及び特許文献２に開示された超音波探傷検査法も、当該工法を用いて作製された溶接継手に対して、出願人によって実施されている。   Previously, the applicant previously applied a welding joint method for reinforcing bars using the metal backing material (joint sleeve) (101) shown in FIG. 13 and an ultrasonic wave applied to a welded joint formed using the construction method. A flaw detection inspection method was proposed (Patent Document 1). Furthermore, the applicant has also proposed an ultrasonic flaw detection inspection method suitably used for such a welded joint (Patent Document 2). The welded joint method disclosed in Patent Document 1 is called the New NT Method (Trademark Registration No. 4235603) and has been implemented by the applicant. Further, the ultrasonic flaw detection inspection methods disclosed in Patent Document 1 and Patent Document 2 are also implemented by the applicant for welded joints manufactured using the construction method.

図１３に示す裏当て材(101)は、帯状のＵ字形部分(103)と、当該Ｕ字形部分の底部から相反する方向に延びた一対の受け部(105a)(105b)とを有している。特許文献１に開示された工法は、このような裏当て材(101)を使用することで、溶接継手の超音波探傷検査に使用する探触子を溶接継手に接近可能とし、その結果として、探傷領域が広い超音波探傷検査を実現するものである。   The backing material (101) shown in FIG. 13 has a belt-like U-shaped portion (103) and a pair of receiving portions (105a) (105b) extending in opposite directions from the bottom of the U-shaped portion. Yes. The construction method disclosed in Patent Document 1 uses such a backing material (101) to make the probe used for ultrasonic flaw inspection of a welded joint accessible to the welded joint. As a result, This realizes ultrasonic flaw detection inspection with a wide flaw detection area.

特開２００２−４５９６７号JP 2002-45967 A 特開２００５−１２１４９７号JP 2005-121497 A

上述の超音波探傷検査では、鉄筋の軸方向に延びるリブ上に探触子が配置される。それ故に、上記工法では、溶接継手の開先及び溶接金属部分に探触子を接近可能とするためには、裏当て材(101)の受け部(105a)(105b)上に、又はそれらの近傍に、鉄筋のリブが配置されないように、裏当て材(101)及び２本の鉄筋を位置決めすることが求められる(特許文献１の図５(Ａ)、図５(Ｂ)及び段落[００２２]〜[００２５])。   In the ultrasonic flaw detection described above, a probe is disposed on a rib extending in the axial direction of the reinforcing bar. Therefore, in the above construction method, in order to make the probe accessible to the groove of the weld joint and the weld metal portion, on the receiving portion (105a) (105b) of the backing material (101) or their It is required to position the backing material (101) and the two reinforcing bars so that no reinforcing bar ribs are arranged in the vicinity (FIGS. 5A and 5B and paragraph [0022] of Patent Document 1). ] To [0025]).

サイズが異なる２本の鉄筋を、裏当て材(101)を用いて突合せ溶接する場合においても、このように鉄筋を位置決めすることが求められる。しかしながら、実際の施工においては、このように鉄筋を位置決めすることが不可能な事態も起こり得る。図１４は、図１３に示す裏当て材(101)を用いて、サイズが異なる２本の鉄筋が突合せ溶接された状態を示している。大きいサイズの第１鉄筋(107)と小さいサイズの第２鉄筋(109)は、受け部(105a)(105b)と接するように夫々配置されており、第２鉄筋(109)の中心軸Ｂ'は、第１鉄筋(107)の中心軸Ａ'と略平行であるが、受け部(105b)に向かってずれている。   Even when two reinforcing bars of different sizes are butt welded using the backing material (101), it is required to position the reinforcing bars in this way. However, in actual construction, there may be a situation where it is impossible to position the reinforcing bars in this way. FIG. 14 shows a state in which two reinforcing bars having different sizes are butt-welded using the backing material (101) shown in FIG. The first rebar (107) having a large size and the second rebar (109) having a small size are arranged so as to contact the receiving portions (105a) and (105b), respectively, and the central axis B ′ of the second rebar (109) is arranged. Is substantially parallel to the central axis A ′ of the first reinforcing bar (107), but is shifted toward the receiving portion (105b).

図１４では、第１鉄筋(107)のリブ(111)と第２鉄筋(109)のリブ(113)とが、受け部(105a)(105b)上に夫々配置されている状態が示されている。このような位置関係は、溶接継手(125)の超音波探傷検査上好ましくないが、図示を省略した第１鉄筋(107)及び第２鉄筋(109)の他端部が既に溶接されている、又はコンクリートに埋設されている場合には、第１鉄筋(107)と第２鉄筋(109)の位置関係は制限されて、自由に調整することはできない。これら鉄筋(107)(109)に対する作業者の作業位置次第では、図１４に示すように第１鉄筋(107)と第２鉄筋(109)を突合せ溶接せざるを得ない状況が、実際の施工では往々にして生じてしまう。   FIG. 14 shows a state in which the rib (111) of the first reinforcing bar (107) and the rib (113) of the second reinforcing bar (109) are arranged on the receiving portions (105a) and (105b), respectively. Yes. Such a positional relationship is not preferable for ultrasonic flaw detection inspection of the welded joint (125), but the other ends of the first rebar (107) and the second rebar (109) (not shown) are already welded. Or when it is embed | buried in concrete, the positional relationship of a 1st reinforcing bar (107) and a 2nd reinforcing bar (109) is restrict | limited, and cannot be adjusted freely. Depending on the work position of the operator with respect to these reinforcing bars (107) and (109), the situation in which the first reinforcing bar (107) and the second reinforcing bar (109) must be butt welded as shown in FIG. It often happens.

図１４に示す状態において、上述の超音波探傷検査が行われる場合、例えば、第２鉄筋(109)の下側のリブ(113)に接するように送信側の探触子(121)が配置され、上側のリブ(115)に接するように受信側の探触子(123)が配置される。送信側の探触子(121)に関しては、下側のリブ(113)上に複数の定位置が設定される。検査中、送信側の探触子(121)はそれら定位置の１つに維持され、受信側の探触子(123)は、溶接継手(125)に向かってリブ(115)上を移動する。送信側の探触子(121)から略７０度の屈折角θで送信された超音波が、溶接継手の欠陥で反射されて、受信側の探触子(123)がその欠陥エコーを受信することにより、その欠陥が検知される。送信側の探触子(121)の定位置を変化させることで、溶接継手(125)の異なる領域について探傷検査が行われる。第１鉄筋(107)側からも同様な探傷検査が行われる。   In the state shown in FIG. 14, when the ultrasonic flaw detection described above is performed, for example, the transmitting probe (121) is arranged so as to contact the lower rib (113) of the second rebar (109). The receiving side probe (123) is arranged so as to contact the upper rib (115). With respect to the probe (121) on the transmission side, a plurality of fixed positions are set on the lower rib (113). During the inspection, the transmitting probe (121) is maintained in one of these positions, and the receiving probe (123) moves on the rib (115) toward the weld joint (125). . The ultrasonic wave transmitted from the transmitting probe (121) at a refraction angle θ of approximately 70 degrees is reflected by a defect in the weld joint, and the receiving probe (123) receives the defect echo. Thus, the defect is detected. By changing the fixed position of the probe (121) on the transmission side, a flaw detection inspection is performed on different regions of the welded joint (125). A similar flaw detection test is also performed from the first reinforcing bar (107) side.

図１４に示すように、第２鉄筋(109)の下側のリブ(113)が受け部(105b)上に載っており、受け部(105a)上に第１鉄筋(107)の下側のリブ(111)が載っていると、好ましい配置と比較して受け部(105a)(105b)の長さ分だけ、送信側の探触子(121)を溶接継手(125)の開先及び溶接金属部分(127)に接近させることができない。その結果、例えば、好ましい鉄筋配置ならば検知可能な欠陥Ｃ'に超音波を当てることができなくなり、当該欠陥Ｃ'の検知は不可能となる。故に、このような状況が生じた場合には、受け部(105a)(105b)を切断して溶接継手(125)から除去した後に、超音波探傷検査が行われている。   As shown in FIG. 14, the lower rib (113) of the second reinforcing bar (109) is placed on the receiving part (105b), and the lower side of the first reinforcing bar (107) is placed on the receiving part (105a). When the rib (111) is placed, the transmitter probe (121) is welded to the groove of the welded joint (125) and welded by the length of the receiving part (105a) (105b) compared to the preferred arrangement. The metal part (127) cannot be approached. As a result, for example, in a preferable reinforcing bar arrangement, it is impossible to apply ultrasonic waves to the detectable defect C ′, and the defect C ′ cannot be detected. Therefore, when such a situation occurs, an ultrasonic flaw inspection is performed after the receiving portions (105a) and (105b) are cut and removed from the welded joint (125).

また、図１４に示すように、サイズが異なる第１鉄筋(107)及び第２鉄筋(109)が突合せ溶接されていると、これら鉄筋(107)(109)のサイズ差、即ち直径差が大きい場合には、裏当て材(101)の上側にて、第１鉄筋(107)及び第２鉄筋(109)の段差が大きくなる。溶接継手(125)に加わる応力の集中を避けるには、溶接継手(125)の溶接金属部分(127)を鉄筋(107)から鉄筋(109)になだらかに繋がるように形成する、つまり養生する必要があるが、鉄筋(107)(109)の段差が大きくなると、裏当て材(101)の上側にて溶融金属の形状の調整が困難となり、作業者の負担が増加してしまう。   Further, as shown in FIG. 14, when the first reinforcing bar (107) and the second reinforcing bar (109) having different sizes are butt welded, the size difference between these reinforcing bars (107) and (109), that is, the diameter difference is large. In this case, the step between the first reinforcing bar (107) and the second reinforcing bar (109) becomes larger on the upper side of the backing material (101). In order to avoid stress concentration on the welded joint (125), the weld metal part (127) of the welded joint (125) must be formed so as to be smoothly connected from the reinforcing bar (107) to the reinforcing bar (109), that is, cured. However, if the steps of the reinforcing bars (107) and (109) become large, it becomes difficult to adjust the shape of the molten metal on the upper side of the backing material (101), and the burden on the operator increases.

本発明は、以上の問題を解決するものであって、サイズが異なる鉄筋と裏当て材の位置関係に影響されることなく、超音波探傷検査にて、溶接継手の開先及び溶接金属部分の近くに探触子を接近させることができ、鉄筋のサイズ差が大きい場合でも、鉄筋になだらかに繋がるように溶接継手の溶接金属部分を容易に形成できる鉄筋の突合せ溶接方法を提供する。さらに、本発明は、当該方法を用いて形成された溶接継手の欠陥を検査するのに好適な超音波探傷検査方法を提供する。   The present invention solves the above problems, and is not affected by the positional relationship between reinforcing bars of different sizes and the backing material, and in ultrasonic flaw detection, the groove of the weld joint and the weld metal part Provided is a butt welding method for reinforcing bars in which a probe can be brought close to the reinforcing bar and a weld metal portion of a welded joint can be easily formed so as to be smoothly connected to the reinforcing bars even when the size difference between the reinforcing bars is large. Furthermore, the present invention provides an ultrasonic flaw detection inspection method suitable for inspecting a defect of a welded joint formed using the method.

本発明の鉄筋の突合せ溶接方法は、中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋を、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて突合せ溶接する方法であって、前記２本の鉄筋の中心軸が略平行に位置し、前記２本の鉄筋の開先間の距離が所定のルート間隔となるように前記２本の鉄筋を配置する第１工程と、前記２本の鉄筋の中心軸が略同一線上に位置するように、前記２本の鉄筋の中心軸を合わせる第２工程と、前記裏当て材が前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の底部が、大きいサイズの鉄筋から小さいサイズの鉄筋に向かって傾くように、前記裏当て材を前記２本の鉄筋の側面と当接させて、前記２本の鉄筋の何れかに前記裏当て材を仮付け溶接する第３工程と、前記２本の鉄筋の開先間を本溶接して、前記２本の鉄筋間に溶接継手を形成する第４工程と含む。   In the butt welding method of the present invention, two linear ribs are formed on each other so as to face each other across the central axis, and two reinforcing bars of different sizes are bent into a substantially U shape. A butt-welding method using a belt-shaped backing material made of steel, wherein the central axes of the two reinforcing bars are positioned substantially in parallel, and the distance between the grooves of the two reinforcing bars is a predetermined route interval A first step of arranging the two reinforcing bars so as to be, a second step of aligning the central axes of the two reinforcing bars so that the central axes of the two reinforcing bars are located substantially on the same line, and The backing material surrounds the space between the gaps of the two reinforcing bars, and the backing material is arranged so that the bottom of the backing material is inclined from the large size reinforcing bar to the small size reinforcing bar. Temporarily attaching the backing material to one of the two reinforcing bars in contact with the side of the reinforcing bars A third step of welding, and the weld between open destination of the two reinforcing bars, comprising a fourth step of forming a welded joint between the two reinforcing bars.

本発明の鉄筋の突合せ溶接方法は、中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋を、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて突合せ溶接する方法であって、前記２本の鉄筋の中心軸が略平行に位置し、前記２本の鉄筋の開先間の距離が所定のルート間隔となるように前記２本の鉄筋を配置する第１工程と、前記２本の鉄筋の中心軸が略同一線上に位置するように、前記２本の鉄筋の中心軸を合わせる第２工程と、前記裏当て材が前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の横幅方向が前記２本の鉄筋の中心軸と略垂直であり、前記裏当て材の帯幅方向が前記２本の鉄筋の中心軸に対して傾くように、前記裏当て材を前記２本の鉄筋の側面と当接させて、前記２本の鉄筋の何れかに前記裏当て材を仮付け溶接する第３工程と、前記２本の鉄筋の開先間を本溶接して、前記２本の鉄筋間に溶接継手を形成する第４工程と含む。   In the butt welding method of the present invention, two linear ribs are formed on each other so as to face each other across the central axis, and two reinforcing bars of different sizes are bent into a substantially U shape. A butt-welding method using a belt-shaped backing material made of steel, wherein the central axes of the two reinforcing bars are positioned substantially in parallel, and the distance between the grooves of the two reinforcing bars is a predetermined route interval A first step of arranging the two reinforcing bars so as to be, a second step of aligning the central axes of the two reinforcing bars so that the central axes of the two reinforcing bars are located substantially on the same line, and The backing material surrounds the space between the grooves of the two reinforcing bars, the lateral width direction of the backing material is substantially perpendicular to the central axis of the two reinforcing bars, and the band width direction of the backing material is The backing material is brought into contact with the side surfaces of the two reinforcing bars so as to be inclined with respect to the central axis of the two reinforcing bars. A third step of tack welding the backing material to one of the two reinforcing bars and a main welding between the grooves of the two reinforcing bars to form a welded joint between the two reinforcing bars. Including the fourth step.

本発明の超音波探傷検査方法は、中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋の間に形成された溶接継手を、超音波を用いて探傷検査する方法であって、前記２本の鉄筋の中心軸は、略同一線上に配置されており、前記２本の鉄筋は、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて突合せ溶接されており、前記裏当て材は、前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の底部が、大きいサイズの鉄筋から小さいサイズの鉄筋に向かって傾くように、前記２本の鉄筋の側面と当接しており、何れかの鉄筋の一方のリブ上に送信側の探触子を配置し、他方のリブ上に受信側の探触子を配置して、前記送信側の探触子から、所定の屈折角で前記溶接継手に向けて超音波を送信する。   In the ultrasonic flaw detection inspection method of the present invention, two linear ribs are respectively formed so as to face each other across the central axis, and a welded joint formed between two reinforcing bars having different sizes is provided. A method for flaw detection inspection using ultrasonic waves, wherein the central axes of the two reinforcing bars are arranged substantially on the same line, and the two reinforcing bars are made of a metal strip curved in a substantially U-shape. The backing material encloses the space between the two reinforcing bars, and the bottom of the backing material has a small size from a large size reinforcing bar. The side surface of the two reinforcing bars is in contact with the two reinforcing bars so as to incline toward the reinforcing bars, and the transmitting probe is arranged on one rib of either reinforcing bar, and the receiving probe is placed on the other rib. A transducer is placed and supersonic waves are directed from the transmitting probe toward the weld joint at a predetermined refraction angle. To send.

本発明の超音波探傷検査方法は、中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋の間に形成された溶接継手を、超音波を用いて探傷検査する溶接継手の超音波探傷検査方法であって、前記２本の鉄筋の中心軸は、略同一線上に配置されており、前記２本の鉄筋は、帯状の鋼板を略Ｕ字形に湾曲させた裏当て材を用いて突合せ溶接されており、前記裏当て材は、前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の横幅方向が前記２本の鉄筋の中心軸と略垂直であり、前記裏当て材の帯幅方向が前記２本の鉄筋の中心軸に対して傾くように、前記２本の鉄筋の側面と当接しており、何れかの鉄筋の２本のリブの一方のリブ上に送信側の探触子を配置し、他方のリブ上に受信側の探触子を配置して、前記送信側の探触子から、所定の屈折角で前記溶接継手に向けて超音波を送信する。   In the ultrasonic flaw detection inspection method of the present invention, two linear ribs are respectively formed so as to face each other across the central axis, and a welded joint formed between two reinforcing bars having different sizes is provided. An ultrasonic flaw detection inspection method for a welded joint for flaw detection inspection using ultrasonic waves, wherein the central axes of the two reinforcing bars are arranged on substantially the same line, and the two reinforcing bars are strip-shaped steel plates Are butt welded using a backing material curved in a substantially U shape, and the backing material surrounds the space between the grooves of the two reinforcing bars, and the lateral width direction of the backing material is Is substantially perpendicular to the central axis of the two reinforcing bars, and is in contact with the side surfaces of the two reinforcing bars so that the width direction of the backing material is inclined with respect to the central axis of the two reinforcing bars, A transmitter probe is placed on one of the two ribs of any reinforcing bar, and the receiver probe is placed on the other rib. By placing the probe, from the probe of the transmitter-side, for transmitting ultrasonic waves toward the weld joint at a predetermined angle of refraction.

本発明の鉄筋と溶接継手の組合せは、中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋と、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて前記２本の鉄筋間に形成された溶接継手との組合せであって、前記２本の鉄筋の中心軸は、略同一線上に配置されており、前記裏当て材は、前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の底部が、大きいサイズの鉄筋から小さいサイズの鉄筋に向かって傾くように、前記２本の鉄筋の側面と当接しており、前記溶接継手は、前記２本の鉄筋の開先間に充填された溶接金属部分と、前記裏当て材とで構成されている。   In the combination of the reinforcing bar and the welded joint according to the present invention, two linear ribs are formed on each other so as to face each other across the central axis, and the two reinforcing bars having different sizes are curved in a substantially U shape. It is a combination with a welded joint formed between the two rebars using a metal belt-like backing material, and the central axes of the two rebars are arranged substantially on the same line, The backing material surrounds the space between the gaps of the two reinforcing bars, and the bottom of the backing material is inclined from the large size reinforcing bar toward the small size reinforcing bar. The weld joint is in contact with a side surface, and is composed of a weld metal portion filled between the grooves of the two reinforcing bars and the backing material.

本発明の鉄筋と溶接継手の組合せは、中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋と、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて前記２本の鉄筋間に形成された溶接継手との組合せであって、前記２本の鉄筋の中心軸は、略同一線上に配置されており、前記裏当て材は、前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の横幅方向が前記２本の鉄筋の中心軸と略垂直であり、前記裏当て材の帯幅方向が前記２本の鉄筋の中心軸に対して傾くように、前記２本の鉄筋の側面と当接しており、前記溶接継手は、前記２本の鉄筋の開先間に充填された溶接金属部分と、前記裏当て材とで構成されている。   In the combination of the reinforcing bar and the welded joint according to the present invention, two linear ribs are formed on each other so as to face each other across the central axis, and the two reinforcing bars having different sizes are curved in a substantially U shape. It is a combination with a welded joint formed between the two rebars using a metal belt-like backing material, and the central axes of the two rebars are arranged substantially on the same line, The backing material surrounds the space between the grooves of the two reinforcing bars, the width direction of the backing material is substantially perpendicular to the central axis of the two reinforcing bars, and the width direction of the backing material Is in contact with the side surfaces of the two reinforcing bars such that the welded metal part is filled between the grooves of the two reinforcing bars. And the backing material.

本発明の鉄筋の突合せ溶接方法によれば、サイズの異なる２本の鉄筋のリブと裏当て材との位置関係に拘わらず、超音波探傷試験に使用する接触子が溶接継手の開先及び溶接金属部分に十分に接近可能なように、これら２本の鉄筋を突合せ溶接することができる。また、作業者は、鉄筋のリブと裏当て材との位置関係に配慮する必要がないので、作業者の負担が軽減される。さらに、本発明の鉄筋の突合せ溶接方法によれば、これら鉄筋のサイズが比較的大きい場合でも、従来方法と比較して、裏当て材の上側にて鉄筋間の段差が低減するので、鉄筋になだらかに繋がるように、溶接継手の溶接金属部分を容易に形成することができる。   According to the butt welding method of the reinforcing bar of the present invention, regardless of the positional relationship between the ribs of two reinforcing bars of different sizes and the backing material, the contact used for the ultrasonic flaw detection test is used for the groove of the weld joint and the welding. These two rebars can be butt welded so that they are sufficiently accessible to the metal part. In addition, since the worker does not need to consider the positional relationship between the reinforcing bar ribs and the backing material, the burden on the worker is reduced. Furthermore, according to the butt welding method of the reinforcing bar of the present invention, even when the size of these reinforcing bars is relatively large, the step between the reinforcing bars is reduced on the upper side of the backing material as compared with the conventional method. The weld metal portion of the weld joint can be easily formed so as to be connected smoothly.

溶接継手の超音波探傷検査方法によれば、サイズが異なる２本の鉄筋のリブと裏当て材との位置関係に拘わらず、超音波探傷試験に使用する接触子を、溶接継手の開先及び溶接金属部分に十分に接近させることができる。また、本発明の鉄筋と溶接継手の組合せは、本発明の鉄筋の突合せ溶接方法及び溶接継手の超音波探傷検査方法と同様な効果を有する。なお、本発明において、裏当て材は、２本の鉄筋の開先近傍にて２本の鉄筋の側面と当接していることが好ましい。   According to the ultrasonic inspection method for welded joints, regardless of the positional relationship between the ribs and backing material of two reinforcing bars of different sizes, the contact used for the ultrasonic inspection test is used for the groove of the welded joint and It is possible to get close enough to the weld metal part. Further, the combination of the reinforcing bar and the welded joint of the present invention has the same effects as the butt welding method of the present invention and the ultrasonic flaw detection inspection method of the welded joint. In the present invention, the backing material is preferably in contact with the side surfaces of the two reinforcing bars in the vicinity of the groove of the two reinforcing bars.

以下、本発明の一実施例について説明する。本実施例において突合せ溶接される鉄筋は、鉄筋コンクリート構造物などに一般的に使用されている異形鉄筋(異形棒鋼)であって、例えば、ＪＩＳ Ｇ ３１１２(鉄筋コンクリート用棒鋼)に規定された異形鉄筋である。異形鉄筋(以下、鉄筋という)の側面には、鉄筋の中心軸に対して平行に延びており、且つ中心軸に対して対称配置された２本の直線状のリブと、中心軸方向に所定の間隔で配置された半円環状(又は円環状)の複数の節(又は螺旋状の節)とが形成されている。このような鉄筋のサイズは、ＪＩＳ Ｇ ３１１２において最大直径を示す表記を用いて区別されており、例えば、Ｄ１３(公称直径１２.７ｍｍ)、Ｄ１６(公称直径１５.９ｍｍ)、Ｄ１９(公称直径１９.１ｍｍ)、Ｄ２２、Ｄ２５、Ｄ２９、Ｄ３２、Ｄ３５、Ｄ３８及びＤ４１などのサイズの鉄筋が存在している。本発明では、Ｄ１３の鉄筋とＤ１６の鉄筋、Ｄ１９の鉄筋とＤ２２の鉄筋、Ｄ１９の鉄筋とＤ２５の鉄筋というように、サイズが異なる２本の鉄筋が突合せ溶接される。鉄筋は、例えば、ＳＤ２９５Ａ、ＳＤ３４５及びＳＤ３９０等の鋼種で形成される。   Hereinafter, an embodiment of the present invention will be described. The reinforcing bars to be butt welded in this embodiment are deformed reinforcing bars (deformed bar) generally used for reinforced concrete structures, for example, deformed reinforcing bars defined in JIS G 3112 (reinforcing steel bars for reinforced concrete). is there. On the side surface of the deformed reinforcing bar (hereinafter referred to as the reinforcing bar), two linear ribs extending in parallel to the central axis of the reinforcing bar and symmetrically arranged with respect to the central axis, and predetermined in the direction of the central axis A plurality of semicircular (or annular) nodes (or spiral nodes) arranged at intervals of. The sizes of such reinforcing bars are distinguished using the notation indicating the maximum diameter in JIS G 3112. For example, D13 (nominal diameter 12.7 mm), D16 (nominal diameter 15.9 mm), D19 (nominal diameter 19 .1 mm), D22, D25, D29, D32, D35, D38, D41, etc. In the present invention, two reinforcing bars of different sizes, such as D13 and D16, D19 and D22, D19 and D25, are butt welded. The reinforcing bars are made of steel types such as SD295A, SD345, and SD390, for example.

図１は、本実施例にて使用する鉄筋支持器(1)の斜視図である。図２は、図１中のＩ−Ｉ線を含む垂直面で鉄筋支持器(1)を破断した断面図である。鉄筋支持器(1)は、円筒状の筐体(3)と、鉄筋を夫々保持する第１保持部(5)及び第２保持部(7)とを具えており、第１保持部(5)は、筐体(3)の側面から外方に延びる連結部材(9)を介して筐体(3)の一端側に固定されている。第２保持部(7)は、筐体(3)の他端側に可動に設けられている。第１保持部(5)には、外方に延出する第１延出部分(11)と第２延出部分(13)とが形成されており、第１延出部分(11)には、図１に仮想線で示す鉄筋が当接する鉄筋保持面(15)が形成されている。鉄筋保持面(15)は、筐体(3)の中心軸Ｆに平行に配置された２つの平面部で構成されており、これら平面部は、鈍角をなすように交差している。筐体(3)の中心軸Ｆに沿った鉄筋保持面(15)の長さは、少なくとも、鉄筋の節の間隔の数倍以上であるのが好ましい。   FIG. 1 is a perspective view of a reinforcing bar support (1) used in this embodiment. FIG. 2 is a cross-sectional view of the reinforcing bar support (1) cut along a vertical plane including the line II in FIG. The reinforcing bar support (1) includes a cylindrical casing (3), a first holding part (5) and a second holding part (7) for holding the reinforcing bar, respectively, and the first holding part (5 ) Is fixed to one end side of the housing (3) via a connecting member (9) extending outward from the side surface of the housing (3). The second holding portion (7) is movably provided on the other end side of the housing (3). The first holding portion (5) is formed with a first extending portion (11) and a second extending portion (13) extending outward, and the first extending portion (11) A reinforcing bar holding surface (15) with which the reinforcing bars shown in phantom lines in FIG. 1 abut is formed. The reinforcing bar holding surface (15) is composed of two plane portions arranged in parallel to the central axis F of the casing (3), and these plane portions intersect so as to form an obtuse angle. The length of the reinforcing bar holding surface (15) along the central axis F of the housing (3) is preferably at least several times the interval between the reinforcing bar nodes.

第１保持部(5)の第２延出部分(13)は、第１延出部分(11)と向き合うように配置されており、鉄筋保持ネジ(17)は、第２延出部分(13)に開けられたネジ孔に螺合して、第１延出部分(11)の鉄筋保持面(15)に対して接近離間する。使用者は、第２保持部(7)に向かって第１保持部(5)から突出するように鉄筋保持面(15)に鉄筋を配置した後、鉄筋保持ネジ(17)を回転させる。鉄筋保持ネジ(17)の先端と鉄筋保持面(15)とによって挟持されることで、第１保持部(5)に鉄筋が固定される。第１保持部(5)に保持された鉄筋の中心軸は、筐体(3)の中心軸Ｆと平行になる。   The second extension part (13) of the first holding part (5) is arranged so as to face the first extension part (11), and the reinforcing bar holding screw (17) is connected to the second extension part (13). ) And screwed into the threaded hole formed in the first extending portion (11) so as to approach and separate from the reinforcing bar holding surface (15). The user arranges the reinforcing bar on the reinforcing bar holding surface (15) so as to protrude from the first holding part (5) toward the second holding part (7), and then rotates the reinforcing bar holding screw (17). The reinforcing bar is fixed to the first holding part (5) by being sandwiched between the tip of the reinforcing bar holding screw (17) and the reinforcing bar holding surface (15). The central axis of the reinforcing bar held by the first holding part (5) is parallel to the central axis F of the housing (3).

第２保持部(7)は、第１保持部(5)のものと同一形状の第１延出部分(19)、第２延出部分(21)及び鉄筋保持ネジ(23)を具えており、第１保持部(5)と同じように鉄筋を保持する。第２保持部(7)の筐体(3)側の側面には、該筐体(3)と平行に配置された円筒部材(25)が接合されている。筐体(3)の内部には、該筐体(3)の内面に沿って摺動する円筒状の第１摺動部材(27)が設けられており、筐体(3)の側壁における円筒部材(25)側の領域には、筐体(3)の中心軸Ｆに沿った開口(29)が開けられている。円筒部材(25)の筐体(3)側の側面には、筐体(3)に向かって延びる厚板状の嵌合部材(31)が接合されており、第１摺動部材(27)側の嵌合部材(31)の端部は、第１摺動部材(27)に形成された溝(33)に嵌められている。嵌合部材(31)は、溝(33)の壁面に沿って、筐体(3)の中心軸Ｆに垂直な方向に摺動自在にされており、中心軸Ｆ方向及び中心軸Ｆ回りについては、第１摺動部材(27)に対して移動しない。   The second holding part (7) comprises a first extending part (19), a second extending part (21) and a reinforcing bar holding screw (23) having the same shape as that of the first holding part (5). The rebar is held in the same manner as the first holding portion (5). A cylindrical member (25) disposed in parallel with the casing (3) is joined to the side surface of the second holding section (7) on the casing (3) side. A cylindrical first sliding member (27) that slides along the inner surface of the casing (3) is provided inside the casing (3), and the cylinder on the side wall of the casing (3) is provided. An opening (29) along the central axis F of the housing (3) is opened in the region on the member (25) side. A thick plate-like fitting member (31) extending toward the housing (3) is joined to the side surface of the cylindrical member (25) on the housing (3) side, and the first sliding member (27) The end of the side fitting member (31) is fitted in a groove (33) formed in the first sliding member (27). The fitting member (31) is slidable in the direction perpendicular to the central axis F of the housing (3) along the wall surface of the groove (33). Does not move relative to the first sliding member (27).

第２保持部(7)側の筐体(3)の端部には、ルート間隔調整つまみ(35)が回転自在に設けられている。ルート間隔調整つまみ(35)は、筐体(3)の中心軸Ｆに沿って筐体(3)の内部に配置された軸体(37)と連結されている。軸体(37)は、その中心軸が筐体(3)の中心軸Ｆと一致するように、筐体(3)の内部にて回転自在に支持されており、円筒状の第１摺動部材(27)の孔を貫通している。軸体(37)の外面にはネジ部が形成され、軸体(37)と第１摺動部材(27)は螺合している。   A route interval adjustment knob (35) is rotatably provided at the end of the casing (3) on the second holding part (7) side. The route interval adjustment knob (35) is coupled to a shaft body (37) disposed inside the housing (3) along the central axis F of the housing (3). The shaft body (37) is rotatably supported inside the casing (3) so that the center axis thereof coincides with the center axis F of the casing (3), and the cylindrical first slide It penetrates the hole of the member (27). A thread portion is formed on the outer surface of the shaft body (37), and the shaft body (37) and the first sliding member (27) are screwed together.

筐体(3)の側面には、厚板状のネジ支持部材(39)が、円筒部材(25)側に延びるように接合されている。ネジ支持部材(39)には、厚さ方向に垂直に孔が開けられており、その孔に軸位置調整ネジ(41)が挿入されている。軸位置調整ネジ(41)の胴部にはフランジが形成されており、当該フランジと軸位置調整ネジ(41)の頭部とが、ネジ支持部材(39)を挟むように配置される。円筒部材(25)には、軸位置調整ネジ(41)側にて該円筒部材(25)の中心軸(筐体(3)の中心軸Ｆ)に沿った開口(43)が形成されており、円筒部材(25)の内部には、その内面に沿って摺動可能な円柱状の第２摺動部材(45)が配置されている。第２摺動部材(45)には、その径方向に沿ったネジ孔(47)が開けられており、軸位置調整ネジ(41)は、開口(43)を通って、第２摺動部材(45)のネジ孔(47)と螺合している。   A thick plate-like screw support member (39) is joined to the side surface of the housing (3) so as to extend toward the cylindrical member (25). The screw support member (39) has a hole perpendicular to the thickness direction, and an axial position adjusting screw (41) is inserted into the hole. A flange is formed on the body portion of the shaft position adjusting screw (41), and the flange and the head of the shaft position adjusting screw (41) are arranged so as to sandwich the screw support member (39). The cylindrical member (25) has an opening (43) along the central axis of the cylindrical member (25) (central axis F of the casing (3)) on the side of the shaft position adjusting screw (41). Inside the cylindrical member (25), a columnar second sliding member (45) that can slide along the inner surface is disposed. The second sliding member (45) is provided with a screw hole (47) along the radial direction thereof, and the shaft position adjusting screw (41) passes through the opening (43) and passes through the second sliding member. It is screwed into the screw hole (47) of (45).

鉄筋支持器(1)が以上の構成を有することにより、第１保持部(5)に保持された鉄筋の開先と、第２保持部(7)に保持された鉄筋の開先との間のルート間隔調整と、これら鉄筋の中心軸合わせ、つまり、これら鉄筋の中心軸を略同一線上に配置することとが行える。ルート間隔調整つまみ(35)を所定方向に回転させると、それに連結された軸体(37)が回転して、軸体(37)と螺合する第１摺動部材(27)が、筐体(3)の中心軸Ｆに沿って移動する。それに伴い、嵌合部材(31)、円筒部材(25)及び第２保持部(7)も、筐体(3)の中心軸Ｆに沿って第１保持部(5)に向かって移動する。この際、軸体(37)に対する第１摺動部材(27)等の回転は、第２摺動部材(45)によって規制される。ルート間隔調整つまみ(35)を逆回転させると、第２保持部(7)は、第１保持部(5)と離間するように移動する。   Since the reinforcing bar support (1) has the above configuration, the gap between the reinforcing bar held by the first holding part (5) and the reinforcing bar held by the second holding part (7) And the center axis of these reinforcing bars, that is, the central axes of these reinforcing bars can be arranged on substantially the same line. When the route interval adjustment knob (35) is rotated in a predetermined direction, the shaft body (37) connected thereto rotates, and the first sliding member (27) screwed with the shaft body (37) is provided in the housing. It moves along the central axis F in (3). Accordingly, the fitting member (31), the cylindrical member (25), and the second holding portion (7) also move toward the first holding portion (5) along the central axis F of the housing (3). At this time, the rotation of the first sliding member (27) and the like with respect to the shaft body (37) is restricted by the second sliding member (45). When the route interval adjustment knob (35) is rotated in the reverse direction, the second holding part (7) moves away from the first holding part (5).

例えば、第２保持部(7)は、図１及び図２に示すように、筐体(3)の中心軸Ｆに沿って第１保持部(5)を平行移動させた位置にあって、第２保持部(7)の鉄筋保持面の２つの平面部は、第１保持部(5)の鉄筋保持面(15)の２つの平面部と、夫々同一平面上に配置されている。軸位置調整ネジ(41)を所定方向に回転させると、軸位置調整ネジ(41)が第２摺動部材(45)のネジ孔(47)により入り込むことで、第２摺動部材(45)は、ネジ支持部材(39)に接近する。これに伴って、円筒部材(25)、それに連結された第２保持部(7)は上方に移動する。この際、第１摺動部材(27)は軸体(37)回りに回転し、嵌合部材(31)は、第１摺動部材(27)に対して離れる方向に移動する。軸位置調整ネジ(41)を逆方向に回転させると、第２保持部(7)は下方に移動する。   For example, as shown in FIGS. 1 and 2, the second holding portion (7) is in a position where the first holding portion (5) is translated along the central axis F of the housing (3). The two flat portions of the reinforcing bar holding surface of the second holding portion (7) are arranged on the same plane as the two flat portions of the reinforcing bar holding surface (15) of the first holding portion (5). When the shaft position adjusting screw (41) is rotated in a predetermined direction, the shaft position adjusting screw (41) enters through the screw hole (47) of the second sliding member (45), so that the second sliding member (45) Approaches the screw support member (39). Along with this, the cylindrical member (25) and the second holding portion (7) connected thereto move upward. At this time, the first sliding member (27) rotates around the shaft body (37), and the fitting member (31) moves away from the first sliding member (27). When the shaft position adjusting screw (41) is rotated in the reverse direction, the second holding portion (7) moves downward.

上述した鉄筋支持器(1)は、本発明の鉄筋の突合せ溶接方法で使用される鉄筋支持器の一例であって、開先のルート間隔調整機能と、鉄筋の中心軸合わせ機能とを有する鉄筋支持器であれは、特段の制限なく本発明にて使用可能である。例えば、第２保持部(7)を、筐体(3)の中心軸Ｆに直交する２方向に移動可能な鉄筋支持器が使用されてもよい。また、上述した鉄筋支持器(1)にて、嵌合部材(31)が第１摺動部材(27)に完全に固定され、第２摺動部材(45)と円筒部材(25)の内面との間に若干の隙間が設けられてもよい。この場合、ルート間隔調整つまみ(35)の回転に伴って、第２保持部(7)は、筐体(3)の中心軸Ｆ回りに移動するが、その後、鉄筋の中心軸合わせが行われるので支障はない。   The reinforcing bar support (1) described above is an example of a reinforcing bar support used in the reinforcing bar butt welding method of the present invention, and has a groove root interval adjusting function and a reinforcing bar center axis adjusting function. Any support can be used in the present invention without any particular limitation. For example, a reinforcing bar support that can move the second holding portion (7) in two directions orthogonal to the central axis F of the housing (3) may be used. Further, in the above-mentioned reinforcing bar support (1), the fitting member (31) is completely fixed to the first sliding member (27), and the inner surfaces of the second sliding member (45) and the cylindrical member (25). A slight gap may be provided between the two. In this case, the second holding portion (7) moves around the central axis F of the housing (3) with the rotation of the route interval adjustment knob (35), but thereafter, the central axes of the reinforcing bars are aligned. So there is no problem.

図３(ａ)は、本実施例で使用される金属製の裏当て材(61)の斜視図であり、図３(ｂ)は、帯幅Ｗ１に沿った方向から見た裏当て材(61)の正面図である。この裏当て材(61)は、略Ｕ字形の形状をしており、半円弧状に湾曲した湾曲部分(63)と、該湾曲部分(63)の両端から延出する平板部分(65a)(65b)とを有している。裏当て材(61)は、例えば、ＪＩＳ Ｇ ３１０１「一般構造用圧延鋼材」に示されたＳＳ４００等の鋼材を用いた帯幅Ｗ１の帯状の鋼板を曲げ加工して作製される。
FIG. 3A is a perspective view of a metal backing material 61 used in this embodiment, and FIG. 3B is a backing material viewed from the direction along the band width W1 ( It is a front view of 61). The backing material (61) has a substantially U-shape, a curved portion (63) curved in a semicircular arc shape, and a flat plate portion (65a) (65a) extending from both ends of the curved portion (63). 65b). The backing material (61) is produced, for example, by bending a strip-shaped steel plate having a width W1 using a steel material such as SS400 shown in JIS G 3101 "General structural rolled steel material".

裏当て材(61)の大きさ又は形状は、突合せ溶接する(サイズが異なる)２本の鉄筋の中で、大きいサイズの鉄筋に合わせて決定される。例えば、大きいサイズの鉄筋としてＤ１６乃至Ｄ４１が使用される場合、湾曲部分(63)の内面の曲率半径ｒは、１０乃至２３ｍｍに、裏当て材(61)の高さＨは、１７乃至３８ｍｍに、裏当て材(61)の帯幅Ｗ１は、１５乃至１９ｍｍにされる。また、裏当て材(61)の厚さｔは、４.５乃至６.０ｍｍにされる。湾曲部分(63)の曲率半径ｒの２倍に、厚さｔの２倍を加えた値が、裏当て材(61)の横幅Ｗ２となる。なお。大きいサイズの鉄筋に合わせて、開先間のルート間隔は、５乃至９ｍｍ程度に設定され(鉄筋のサイズが大きくなると、基本的にルート間隔は長くされる)、設定されたルート間隔に対して、帯幅Ｗ１の値が６ｍｍ乃至１２ｍｍ程度大きい裏当て材(61)が使用される(ルート間隔が大きくなると、基本的に帯幅Ｗ１は長くされる)。ここで留意すべきは、本実施例で使用される裏当て材(61)の帯幅Ｗ１は、従来より使用されているＵ字状の裏当て材の幅と比較して、かなり小さいことである。なお、上述の数値はあくまで一例であって、本発明の効果が得られる限りにおいて変更可能である。   The size or shape of the backing material (61) is determined in accordance with the rebar having a larger size among the two rebars to be butt welded (different sizes). For example, when D16 to D41 are used as large size reinforcing bars, the curvature radius r of the inner surface of the curved portion (63) is 10 to 23 mm, and the height H of the backing material (61) is 17 to 38 mm. The band width W1 of the backing material (61) is 15 to 19 mm. Further, the thickness t of the backing material (61) is set to 4.5 to 6.0 mm. The value obtained by adding twice the thickness t to twice the radius of curvature r of the curved portion (63) is the lateral width W2 of the backing material (61). Note that. The route interval between the grooves is set to about 5 to 9 mm in accordance with the large size reinforcing bar (the route interval is basically increased when the reinforcing bar size increases), and the set route interval is A backing material (61) having a band width W1 value of about 6 mm to 12 mm is used (basically, the band width W1 is increased when the route interval is increased). It should be noted here that the band width W1 of the backing material (61) used in the present embodiment is considerably smaller than the width of the U-shaped backing material used conventionally. is there. The above numerical values are merely examples, and can be changed as long as the effects of the present invention are obtained.

次に、本発明の実施例である鉄筋の突合せ溶接方法について、図を用いて工程順に説明する。まず、図４に示すように、突合せ溶接する一方の鉄筋(71)を、上述したように鉄筋支持器(1)の第１保持部(5)に固定する。鉄筋(71)は、その開先側の部分が、鉄筋支持器(1)の第２保持部(7)に向かって、第１保持部(5)から突出するように固定される。次に、図５に示すように、突合せ溶接する他方の鉄筋(75)を、鉄筋支持器(1)の第２保持部(7)に固定する。鉄筋(75)は、その開先側の部分が、第１保持部(5)側に向かって、第２保持部(7)から突出するように固定される。２本の鉄筋(71)(75)の開先間の間隔は、この時点では設定すべきルート間隔よりも大きくされる。なお、鉄筋支持器(1)が上述の構成を有することにより、２本の鉄筋(71)(75)の中心軸Ａ及びＢは、上下にずれているが平行になる。しかしながら、２本の鉄筋(71)(75)の中心軸Ａ及びＢが厳密に平行になることが、これら鉄筋(71)(75)の突合せ溶接においては必要とされず、２本の鉄筋(71)(75)の中心軸Ａ及びＢは略平行に配置されれば足りる。   Next, the butt welding method of the reinforcing bar which is an Example of this invention is demonstrated in order of a process using figures. First, as shown in FIG. 4, one rebar (71) to be butt welded is fixed to the first holding portion (5) of the rebar supporter (1) as described above. The reinforcing bar (71) is fixed so that a portion on the groove side protrudes from the first holding part (5) toward the second holding part (7) of the reinforcing bar support (1). Next, as shown in FIG. 5, the other reinforcing bar (75) to be butt welded is fixed to the second holding portion (7) of the reinforcing bar support (1). The reinforcing bar (75) is fixed so that the groove side portion protrudes from the second holding part (7) toward the first holding part (5) side. The interval between the grooves of the two reinforcing bars (71) and (75) is made larger than the route interval to be set at this point. In addition, when the reinforcing bar support (1) has the above-described configuration, the central axes A and B of the two reinforcing bars (71) and (75) are shifted in parallel but parallel. However, it is not necessary for the butt welding of the reinforcing bars (71) and (75) that the central axes A and B of the two reinforcing bars (71) and (75) are strictly parallel, and the two reinforcing bars ( 71) It is sufficient that the central axes A and B of (75) are arranged substantially in parallel.

図５及び以後に参照する図面では、大きいサイズの鉄筋(71)が第１保持部(5)に固定され、小さいサイズの鉄筋(75)が第２保持部(7)に固定され、それらのリブ(73a)(73b)(77a)(77b)が上下に配置された状態が示されている。しかしながら、第１保持部(5)に小さいサイズの鉄筋(75)が固定され、第２保持部(7)に大きいサイズの鉄筋(71)が固定されてもよく、これら保持部(5)(7)に固定される鉄筋(71)(75)の中心軸回りの位置は制限されない(図示された鉄筋(71)(75)は、それらの中心軸Ａ及びＢ回りに、任意の角度回転されてもよい)。また、図５では、図１及び図２に示すように、第２保持部(7)は、筐体(3)の中心軸Ｆに沿って第１保持部(5)を平行移動させた位置にあるが、本発明の実施において、鉄筋(75)を固定する際の第２保持部(7)の上下の位置(筐体(3)の中心軸Ｆ回りの位置)は、特に限定されない。   In FIG. 5 and the drawings to be referred to hereinafter, a large size reinforcing bar (71) is fixed to the first holding part (5), and a small size reinforcing bar (75) is fixed to the second holding part (7). The state in which the ribs (73a), (73b), (77a), and (77b) are arranged vertically is shown. However, a small-sized reinforcing bar (75) may be fixed to the first holding part (5), and a large-sized reinforcing bar (71) may be fixed to the second holding part (7), and these holding parts (5) ( The positions of the reinforcing bars (71) and (75) fixed to 7) around the central axis are not limited (the illustrated reinforcing bars (71) and (75) are rotated around their central axes A and B by an arbitrary angle). May be) In FIG. 5, as shown in FIGS. 1 and 2, the second holding portion (7) is a position where the first holding portion (5) is translated along the central axis F of the housing (3). However, in the implementation of the present invention, the upper and lower positions (positions around the central axis F of the housing (3)) of the second holding portion (7) when the reinforcing bar (75) is fixed are not particularly limited.

次に、２本の鉄筋(71)(75)の開先間に、ルートケージ(81)を挿入し、第２保持部(7)が第１保持部(5)に近づくように、即ち、鉄筋(75)の開先が鉄筋(71)の開先に近づくように、鉄筋支持器(1)のルート間隔調整つまみ(35)を回転させる。ルートケージ(81)は、設定すべきルート間隔分の厚みを有する板材であって、図６に示すように、ルートケージ(81)の一方の面に鉄筋(71)の開先が当接し、ルートケージ(81)の他方の面に鉄筋(75)の開先が当接して、第２保持部(7)のさらなる移動ができなくなるまで、ルート間隔調整つまみ(35)を回転させる。これによって、開先間のルート間隔が所望の値に設定される。その後、ルートケージ(81)は、開先の間から抜き出される。   Next, the root cage (81) is inserted between the grooves of the two reinforcing bars (71) and (75) so that the second holding part (7) approaches the first holding part (5), that is, The route interval adjustment knob (35) of the reinforcing bar support (1) is rotated so that the groove of the reinforcing bar (75) approaches the groove of the reinforcing bar (71). The root cage (81) is a plate material having a thickness corresponding to the root interval to be set, and as shown in FIG. 6, the groove of the reinforcing bar (71) abuts on one surface of the root cage (81), The route interval adjusting knob (35) is rotated until the groove of the reinforcing bar (75) comes into contact with the other surface of the root cage (81) and the second holding portion (7) cannot be further moved. Thereby, the route interval between the grooves is set to a desired value. Thereafter, the root cage (81) is extracted from between the grooves.

次に、図７に示すように、２本の鉄筋(71)(75)の中心軸Ａ及びＢを合わせる工程が行われる。この工程では、図１及び図２に示した軸位置調整ネジ(41)を回転させることで、第２保持部(7)の鉄筋(75)を移動させて、鉄筋(71)(75)の中心軸Ａ及びＢを略一直線上に配置する。２本の鉄筋(71)(75)の中心軸合わせには、例えば定規(83)が使用される。作業者は、鉄筋(71)(75)の中心軸Ａ及びＢが、所定の誤差範囲内で、同一直線上に配置されるように、鉄筋(75)の位置を調整する。   Next, as shown in FIG. 7, a step of aligning the central axes A and B of the two reinforcing bars (71) and (75) is performed. In this process, by rotating the shaft position adjusting screw (41) shown in FIGS. 1 and 2, the rebar (75) of the second holding part (7) is moved, and the rebar (71) (75) The central axes A and B are arranged on a substantially straight line. For example, a ruler (83) is used to align the central axes of the two reinforcing bars (71) and (75). The operator adjusts the position of the reinforcing bar (75) so that the central axes A and B of the reinforcing bars (71) and (75) are arranged on the same straight line within a predetermined error range.

例えば、溶接される鉄筋(71)(75)が、Ｄ１３とＤ１６の組合せやＤ３５とＤ３８の組合せであるように、鉄筋(71)(75)が１サイズ異なる場合には、これらの中心軸Ａ及びＢが１ｍｍ程度の誤差範囲内で一致するように、中心軸合わせが行われる。Ｄ１９とＤ２５の組合せやＤ３５とＤ４１の組合せのように、鉄筋(71)(75)が２サイズ異なる場合には、これらの中心軸Ａ及びＢが２ｍｍ程度の誤差範囲内で一致するように、中心軸合わせが行われる。例えば、図６に示すように鉄筋(71)(75)が配置された状態で、所定の目盛だけ中心軸Ａ側に向けて入るように、図７に示すように鉄筋(71)の開先に定規(83)を当てる。その後、定規(83)の端部に鉄筋(75)の側面が当接するまで、鉄筋(75)を移動させると、鉄筋(71)(75)の中心軸合わせが完了する。また、定規(83)の代わりに、図７の左上に示すようなゲージ(85)が使用されてもよい。このケージ(85)の端部は段状に形成されており、突出部分(85a)に小さいサイズの鉄筋(75)の側面が当接し、切欠き部分(85b)に大きいサイズの鉄筋(71)の側面が当接するように、これら鉄筋(71)(75)を位置合わせすることで、これら鉄筋(71)(75)の中心軸Ａ及びＢは、所望の誤差範囲内で同一線上に配置される。   For example, when the reinforcing bars 71 and 75 are different in size by one size such that the reinforcing bars 71 and 75 to be welded are a combination of D13 and D16 or a combination of D35 and D38, these central axes A The center axes are aligned so that B and B match within an error range of about 1 mm. When the reinforcing bars (71) and (75) are different in two sizes, such as the combination of D19 and D25 and the combination of D35 and D41, the central axes A and B are matched within an error range of about 2 mm. Center axis alignment is performed. For example, in a state where the reinforcing bars (71), (75) are arranged as shown in FIG. 6, the groove of the reinforcing bars (71) is shown in FIG. 7 so that a predetermined scale is entered toward the central axis A side. Apply ruler (83) to. Thereafter, when the reinforcing bar (75) is moved until the side surface of the reinforcing bar (75) comes into contact with the end of the ruler (83), the center axis alignment of the reinforcing bars (71) and (75) is completed. Further, instead of the ruler (83), a gauge (85) as shown in the upper left of FIG. 7 may be used. The end of this cage (85) is formed in a stepped shape, the side of the small-sized reinforcing bar (75) abuts on the protruding part (85a), and the large-sized reinforcing bar (71) in the notched part (85b) By aligning the reinforcing bars (71) and (75) so that the side surfaces of the reinforcing bars are in contact with each other, the central axes A and B of the reinforcing bars (71) and (75) are arranged on the same line within a desired error range. The

次に、図８に示すように、図３(ａ)及び(ｂ)に示す略Ｕ字状の裏当て材(61)が、鉄筋(71)(75)の何れかに仮付け溶接される。図９は、図８において上方から開先周辺を見た平面図であり、仮付け溶接箇所(91)が斜線領域で示されている。図９では、大きいサイズの鉄筋(71)の側面と裏当て材(61)の内面とが部分的に溶接されている。裏当て材(61)は、２本の鉄筋(71)(75)の開先間の空間を囲うように配置される。裏当て材(61)は、その底部が、大きいサイズの鉄筋(71)から小さいサイズの鉄筋(75)に向かって傾くように、２本の鉄筋(71)(75)の側面と当接している。また、図９に示されているように、裏当て材(61)の横幅方向Ｗ２が、２本の鉄筋の中心軸Ａ及びＢと略垂直であって、図８に示されるように、裏当て材(61)の帯幅方向Ｗ１が、これら中心軸Ａ及びＢに対して傾くように、裏当て材(61)は配置される。   Next, as shown in FIG. 8, the substantially U-shaped backing material (61) shown in FIGS. 3 (a) and 3 (b) is tack welded to one of the reinforcing bars (71) and (75). . FIG. 9 is a plan view of the periphery of the groove from above in FIG. 8, and the tack welded portion (91) is indicated by a hatched area. In FIG. 9, the side surface of the large-sized reinforcing bar (71) and the inner surface of the backing material (61) are partially welded. The backing material (61) is disposed so as to surround the space between the grooves of the two reinforcing bars (71) and (75). The backing material (61) is in contact with the side surfaces of the two reinforcing bars (71) and (75) so that the bottom part is inclined from the large-sized reinforcing bar (71) toward the small-sized reinforcing bar (75). Yes. Further, as shown in FIG. 9, the width direction W2 of the backing material (61) is substantially perpendicular to the central axes A and B of the two reinforcing bars, and as shown in FIG. The backing material (61) is arranged so that the band width direction W1 of the backing material (61) is inclined with respect to the central axes A and B.

本実施例では、例えば、半自動炭酸ガスアーク溶接法を用いて、裏当て材(61)の仮付け溶接と、後述する本溶接とが行われる。図８には、溶接トーチ(87)及び溶接ワイヤ(89)等が示されている。半自動炭酸ガスアーク溶接法は周知であって、詳細な説明は省略する。なお、半自動炭酸ガスアーク溶接法以外の溶接方法が、本件発明において使用されてもよい。   In the present embodiment, for example, tack welding of the backing material (61) and main welding described later are performed using a semi-automatic carbon dioxide arc welding method. FIG. 8 shows a welding torch (87), a welding wire (89), and the like. The semi-automatic carbon dioxide arc welding method is well known and will not be described in detail. A welding method other than the semi-automatic carbon dioxide arc welding method may be used in the present invention.

裏当て材(61)の仮付け溶接が終了すると、本溶接が行われて、図１０に示すように鉄筋(71)(75)間に溶接継手(93)が形成される。ここで溶接継手(93)とは、開先間に充填される溶接金属部分(95)と裏当て材(61)とによって構成される継手構造を意味する。本溶接では、溶接ワイヤ(89)が溶融した溶融金属が、数回のパスに分けて、裏当て材(61)の底部から開先間の空間、及び鉄筋(71)(75)と裏当て材(61)の間の空間に充填される。充填された溶融金属が冷却することで溶接金属部分(95)が形成され、溶接継手(93)が完成する。   When the tack welding of the backing material (61) is completed, the main welding is performed, and a weld joint (93) is formed between the reinforcing bars (71) and (75) as shown in FIG. Here, the weld joint (93) means a joint structure constituted by a weld metal portion (95) filled between the grooves and the backing material (61). In this welding, the molten metal in which the welding wire (89) is melted is divided into several passes, and the space between the bottom of the backing material (61) and the groove, and the reinforcing bars (71) (75) The space between the materials (61) is filled. By cooling the filled molten metal, a weld metal portion (95) is formed, and the weld joint (93) is completed.

本発明では、サイズの異なる鉄筋(71)(75)が、これらの中心軸Ａ及びＢが略同一線上に配置されるように突合せ溶接されていることから、従来方法と比較して、これら鉄筋(71)(75)の段差は、裏当て材(61)の上部側にて小さくなる。故に、裏当て材(61)の上側にて、鉄筋(71)(75)の外面となだらかに繋がるように溶接金属部分(95)を形成、つまり養生することが容易になる。また、上述したように、本発明では、従来方法と比較して幅の小さい裏当て材(61)が使用されており、裏当て材(61)は、鉄筋(71)(75)の開先付近にて、これら鉄筋(71)(75)の側面と当接している。これにより、裏当て材(61)と鉄筋(71)(75)の間の隙間が小さくなり、裏当て材(61)と鉄筋(71)(75)の間に充填される溶接金属部分(95)の量が低減され、裏当て材(61)と鉄筋(71)(75)の界面における欠陥の発生も抑制される。   In the present invention, the reinforcing bars (71) and (75) having different sizes are butt-welded so that their central axes A and B are arranged on substantially the same line. The steps of (71) and (75) become smaller on the upper side of the backing material (61). Therefore, on the upper side of the backing material (61), the weld metal portion (95) can be easily formed, that is, cured so as to be smoothly connected to the outer surfaces of the reinforcing bars (71) and (75). Further, as described above, in the present invention, a backing material (61) having a smaller width than that of the conventional method is used, and the backing material (61) is a groove of the reinforcing bars (71) (75). In the vicinity, they are in contact with the side surfaces of the reinforcing bars (71) and (75). This reduces the gap between the backing material (61) and the reinforcing bars (71), (75), and the weld metal part (95) filled between the backing material (61) and the reinforcing bars (71), (75). ) And the occurrence of defects at the interface between the backing material (61) and the reinforcing bars (71) and (75) is also suppressed.

次に、本件発明の超音波探傷検査方法の実施例について説明する。図１１には、上述した鉄筋の突合せ溶接方法に基づいて形成された溶接継手(93)に対して、超音波探傷検査を行う様子が示されている。小さいサイズの鉄筋(75)の下側のリブ(77a)に送信側の探触子(97)が配置されており、上側のリブ(77b)に受信側の探触子(99)が配置されている。本実施例の超音波探傷検査方法では斜角探傷が行われ、送信側の探触子(97)は、鉄筋(75)の径方向に対して所定の角度(屈折角)θ傾いた方向に超音波を送信する。屈折角θは、例えば７０度にされる。溶接継手(93)に存在する欠陥に当たると、超音波は反射して、エコー(欠陥エコー)が生じる。探触子(97)(99)には、例えば、５Ｚ５×５Ａ７０であって、ＪＩＳ Ｚ ３０６２の付属書３に記載されたものが使用される。   Next, an embodiment of the ultrasonic flaw detection inspection method of the present invention will be described. FIG. 11 shows a state in which an ultrasonic flaw detection inspection is performed on a welded joint (93) formed based on the above-described butt welding method for reinforcing bars. The transmitter probe (97) is placed on the lower rib (77a) of the small reinforcing bar (75), and the receiver probe (99) is placed on the upper rib (77b). ing. In the ultrasonic flaw detection method of this embodiment, oblique flaw detection is performed, and the probe (97) on the transmission side is inclined in a direction inclined by a predetermined angle (refractive angle) θ with respect to the radial direction of the reinforcing bar (75). Send ultrasound. The refraction angle θ is set to 70 degrees, for example. When hitting a defect existing in the welded joint (93), the ultrasonic wave is reflected and an echo (defect echo) is generated. As the probes (97) and (99), for example, the one described in Appendix 3 of JIS Z 3062, which is 5Z5 × 5A70, is used.

送信側の探触子(97)は、下側のリブ(77a)上に所定の間隔(例えば１０ｍｍ)で設定された複数の定位置の何れかに配置される。受信側の探触子(99)は、所定の距離(例えば、鉄筋(75)の開先から２.５Ｄ〜３Ｄ(Ｄは、鉄筋(75)のサイズ))程度離れた位置から、溶接継手(93)に向かって、上側のリブ(77b)上を摺動する。受信側の探触子(99)で受信された欠陥エコーは電気信号に変換されて、該電気信号は、図示を省略した受信部にて増幅及び減衰された後、図示を省略したディスプレイにて、波形として表示される。受信側の探触子(99）が、鉄筋(75)の端部まで移動すると、次に送信側の探触子(97)を他の定位置に移して、同様に検査が行われる。探傷検査中、探触子(97)(99)を首振り動作させることが好ましく、特に、特に特許文献２に説明されたように、探触子(97)(99)を首振り動作させることが好ましい。大きいサイズの鉄筋(71)に探触子(97)(99)を配置しても、このように超音波探傷検査が行われる。なお、下側のリブ(77a)上に受信側の探触子(99)を、上側のリブ(77b)に送信側の探触子(97)が配置されてもよい。   The probe (97) on the transmission side is arranged on any one of a plurality of fixed positions set at a predetermined interval (for example, 10 mm) on the lower rib (77a). The probe (99) on the receiving side is a welded joint from a predetermined distance (for example, 2.5D to 3D (D is the size of the rebar (75))) from the groove of the rebar (75). It slides on the upper rib (77b) toward (93). The defect echo received by the probe (99) on the receiving side is converted into an electric signal, and the electric signal is amplified and attenuated by a receiving unit (not shown) and then displayed on a display (not shown). , Displayed as a waveform. When the receiving side probe (99) moves to the end of the reinforcing bar (75), the transmitting side probe (97) is moved to another fixed position, and the inspection is performed in the same manner. It is preferable to swing the probe (97) (99) during the flaw detection inspection, and in particular, to swing the probe (97) (99) as described in Patent Document 2. Is preferred. Even if the probes (97) and (99) are arranged on the rebar (71) of a large size, the ultrasonic flaw detection is performed in this way. The receiving side probe (99) may be arranged on the lower rib (77a), and the transmitting side probe (97) may be arranged on the upper rib (77b).

図１２には、図１１に示す鉄筋(71)(75)が、中心軸Ａ及びＢ回りに９０度回転した位置で突合せ溶接された場合において、超音波探傷検査を行う様子が示されている。図１１及び図１２と、図１４とを比較すると理解できるように、本発明の超音波探傷検査方法では、図３に示す裏当て材(101)のような受け部(105a)(105b)がない裏当て材(61)を使用していることから、裏当て材(61)と鉄筋(71)(75)のリブ(73a)(73b)(77a)(77b)との位置関係に左右されることなく、送信側の探触子(97)及び受信側の探触子(99)を、鉄筋(71)(75)の開先及び溶接継手(93)の溶接金属部分(95)の近くに配置できる。その結果、裏当て材(61)と鉄筋(71)(75)のリブ(73a)(73b)(77a)(77b)との位置関係に応じて、例えば、図１１に示した欠陥Ｃのような、開先面の縁の近くにある欠陥が検知されず、超音波探傷範囲が狭くなるという事態は、本発明では生じない。   FIG. 12 shows a state in which ultrasonic flaw inspection is performed when the reinforcing bars (71) and (75) shown in FIG. 11 are butt welded at positions rotated 90 degrees around the central axes A and B. . As can be understood by comparing FIG. 11 and FIG. 12 with FIG. 14, in the ultrasonic inspection method of the present invention, the receiving portions (105a) and (105b) such as the backing material (101) shown in FIG. The backer material (61) is not used, so it depends on the positional relationship between the backer material (61) and the ribs (73a) (73b) (77a) (77b) of the reinforcing bars (71) (75). Without connecting the transmitter probe (97) and the receiver probe (99) near the groove of the reinforcing bar (71) (75) and the welded metal part (95) of the welded joint (93). Can be placed. As a result, depending on the positional relationship between the backing material (61) and the ribs (73a), (73b), (77a), and (77b) of the reinforcing bars (71) and (75), for example, the defect C shown in FIG. In the present invention, a situation in which a defect near the edge of the groove surface is not detected and the ultrasonic flaw detection range is narrowed does not occur.

上記実施例の説明は、本発明を説明するためのものであって、特許請求の範囲に記載の発明を限定し、或いは範囲を減縮する様に解すべきではない。また、本発明の各部構成は上記実施例に限らず、特許請求の範囲に記載の技術的範囲内で種々の変形が可能であることは勿論である。   The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. Moreover, each part structure of this invention is not restricted to the said Example, Of course, a various deformation | transformation is possible within the technical scope as described in a claim.

本発明の鉄筋の突合せ溶接方法の実施例で使用される鉄筋支持器を示す斜視図である。It is a perspective view which shows the reinforcing bar support used in the Example of the butt welding method of the reinforcing bar of this invention. 図２は、図１に示すＩ−Ｉ線を含む垂直面で破断した鉄筋支持器の断面図である。FIG. 2 is a cross-sectional view of the reinforcing bar support broken along a vertical plane including the line I-I shown in FIG. 1. 図３(ａ)は、本発明の実施例で使用される裏当て材の斜視図であり、図３(ｂ)は、図３(ａ)に示す帯幅ｗ１に沿った方向から見た同裏当て材の正面図である。FIG. 3A is a perspective view of the backing material used in the embodiment of the present invention, and FIG. 3B is the same as seen from the direction along the band width w1 shown in FIG. It is a front view of a backing material. 本発明の実施例である鉄筋の突合せ溶接方法の工程を説明する正面図である。It is a front view explaining the process of the butt welding method of the reinforcing bar which is an Example of this invention. 本発明の実施例である鉄筋の突合せ溶接方法の工程を説明する正面図である。It is a front view explaining the process of the butt welding method of the reinforcing bar which is an Example of this invention. 本発明の実施例である鉄筋の突合せ溶接方法の工程を説明する正面図である。It is a front view explaining the process of the butt welding method of the reinforcing bar which is an Example of this invention. 本発明の実施例である鉄筋の突合せ溶接方法の工程を説明する正面図である。It is a front view explaining the process of the butt welding method of the reinforcing bar which is an Example of this invention. 本発明の実施例である鉄筋の突合せ溶接方法の工程を説明する正面図である。It is a front view explaining the process of the butt welding method of the reinforcing bar which is an Example of this invention. 図８に示す鉄筋の開先及び裏当て材付近の平面図である。FIG. 9 is a plan view of the vicinity of the groove and the backing material of the reinforcing bar shown in FIG. 8. 本発明の実施例である鉄筋の突合せ溶接方法の工程を説明する正面図である。It is a front view explaining the process of the butt welding method of the reinforcing bar which is an Example of this invention. 本発明の実施例である鉄筋の突合せ溶接方法を用いて、サイズが異なる２本の鉄筋が突合せ溶接された状態にて、本発明の超音波探傷検査方法が行われる様子を示す正面図である。It is a front view which shows a mode that the ultrasonic flaw inspection method of this invention is performed in the state in which two rebars from which size differs were butt-welded using the butt welding method of the reinforcing bar which is an Example of this invention. . 本発明の実施例である鉄筋の突合せ溶接方法を用いて、サイズが異なる２本の鉄筋が突合せ溶接された状態にて、本発明の超音波探傷検査方法が行われる様子を示す正面図である。It is a front view which shows a mode that the ultrasonic flaw inspection method of this invention is performed in the state in which two rebars from which size differs were butt-welded using the butt welding method of the reinforcing bar which is an Example of this invention. . 従来の突合せ溶接方法に使用される裏当て材を示す斜視図である。It is a perspective view which shows the backing material used for the conventional butt welding method. 図１３に示す裏当て材を用いて、サイズが異なる２本の鉄筋が突合せ溶接された状態にて、超音波探傷検査方法が行われる様子を示す正面図である。It is a front view which shows a mode that the ultrasonic flaw detection test method is performed in the state by which two rebars from which size differs were butt-welded using the backing material shown in FIG.

符号の説明Explanation of symbols

(1) 鉄筋支持器
(61) 裏当て材
(71) 大サイズの鉄筋
(73a) リブ
(73b) リブ
(75) 小サイズの鉄筋
(77a) リブ
(77b) リブ
(93) 溶接継手
(95) 溶接金属部分
(97) 探触子
(99) 探触子 (1) Rebar support
(61) Backing material
(71) Large size rebar
(73a) Ribs
(73b) Ribs
(75) Small size rebar
(77a) Ribs
(77b) Ribs
(93) Welded joint
(95) Weld metal part
(97) Probe
(99) Probe

Claims (8)

中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋の間に形成された溶接継手を、超音波を用いて探傷検査する方法であって、
前記２本の鉄筋の中心軸は、略同一線上に配置されており、
前記２本の鉄筋は、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて突合せ溶接されており、
前記裏当て材は、前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の底部が、大きいサイズの鉄筋から小さいサイズの鉄筋に向かって傾くように、前記２本の鉄筋の側面と当接しており、
何れかの鉄筋の一方のリブ上に送信側の探触子を配置し、他方のリブ上に受信側の探触子を配置して、前記送信側の探触子から、所定の屈折角で前記溶接継手に向けて超音波を送信する方法。 A method for flaw detection using ultrasonic waves of a welded joint formed between two rebars each having two linear ribs formed so as to face each other across the central axis Because
The central axes of the two reinforcing bars are arranged substantially on the same line,
The two rebars are butt welded using a metal belt-like backing material curved in a substantially U-shape,
The backing material surrounds the space between the grooves of the two reinforcing bars and the two reinforcing bars so that the bottom of the backing material is inclined from the large size reinforcing bar to the small size reinforcing bar. Is in contact with the side of
A transmitting probe is arranged on one rib of any one of the reinforcing bars, and a receiving probe is arranged on the other rib so that the transmitting probe has a predetermined refraction angle. A method of transmitting ultrasonic waves toward the weld joint. 前記裏当て材は、前記２本の鉄筋の開先近傍にて前記２本の鉄筋の側面と当接している、請求項１に記載の方法。    The method according to claim 1, wherein the backing material is in contact with a side surface of the two reinforcing bars in the vicinity of a groove of the two reinforcing bars. 中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋を、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて突合せ溶接して、前記２本の鉄筋の間に形成された溶接継手を超音波を用いて探傷検査する方法であって、
前記２本の鉄筋の中心軸が略平行に位置し、前記２本の鉄筋の開先間の距離が所定のルート間隔となるように前記２本の鉄筋を配置する第１工程と、
前記２本の鉄筋の中心軸が略同一線上に位置するように、前記２本の鉄筋の中心軸を合わせる第２工程と、
前記裏当て材が前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の底部が、前記大きいサイズの鉄筋から前記小さいサイズの鉄筋に向かって傾くように、前記裏当て材を前記２本の鉄筋の側面と当接させて、前記２本の鉄筋の何れかに前記裏当て材を仮付け溶接する第３工程と、
前記２本の鉄筋の開先間を本溶接して、前記２本の鉄筋間に前記溶接継手を形成する第４工程と、
何れかの鉄筋の一方のリブ上に送信側の探触子を配置し、他方のリブ上に受信側の探触子を配置して、前記送信側の探触子から、所定の屈折角で前記溶接継手に向けて超音波を送信する第５工程とを含む方法。 Two linear ribs are formed on each other so as to face each other across the central axis, and two reinforcing bars of different sizes are used using a metal belt-like backing material curved in a substantially U shape A method of performing a flaw detection inspection using ultrasonic waves on a welded joint formed between the two rebars by butt welding,
A first step of arranging the two reinforcing bars so that the central axes of the two reinforcing bars are positioned substantially parallel and the distance between the grooves of the two reinforcing bars is a predetermined route interval;
A second step of aligning the central axes of the two reinforcing bars so that the central axes of the two reinforcing bars are located substantially on the same line;
The backing material surrounds the space between the two reinforcing bars, and the bottom of the backing material is inclined from the large size reinforcing bar toward the small size reinforcing bar. A third step in which the backing material is tack welded to either of the two reinforcing bars,
A fourth step of performing main welding between the grooves of the two reinforcing bars and forming the welded joint between the two reinforcing bars;
A transmitting probe is arranged on one rib of any one of the reinforcing bars, and a receiving probe is arranged on the other rib so that the transmitting probe has a predetermined refraction angle. And a fifth step of transmitting ultrasonic waves toward the weld joint . 前記第３工程では、前記２本の鉄筋の開先近傍にて前記２本の鉄筋の側面と当接するように、前記裏当て材が仮付け溶接される、請求項３に記載の方法。   The method according to claim 3, wherein, in the third step, the backing material is tack welded so as to abut the side surfaces of the two reinforcing bars in the vicinity of the groove of the two reinforcing bars. 中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋の間に形成された溶接継手を、超音波を用いて探傷検査する方法であって、
前記２本の鉄筋の中心軸は、略同一線上に配置されており、
前記２本の鉄筋は、帯状の鋼板を略Ｕ字形に湾曲させた裏当て材を用いて突合せ溶接されており、
前記裏当て材は、前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の横幅方向が前記２本の鉄筋の中心軸と略垂直であり、前記裏当て材の帯幅方向が前記２本の鉄筋の中心軸に対して傾くように、前記２本の鉄筋の側面と当接しており、
何れかの鉄筋の一方のリブ上に送信側の探触子を配置し、他方のリブ上に受信側の探触子を配置して、前記送信側の探触子から、所定の屈折角で前記溶接継手に向けて超音波を送信する方法。 A method for flaw detection using ultrasonic waves of a welded joint formed between two rebars each having two linear ribs formed so as to face each other across the central axis Because
The central axes of the two reinforcing bars are arranged substantially on the same line,
The two reinforcing bars are butt welded using a backing material obtained by curving a strip-shaped steel plate into a substantially U shape,
The backing material encloses a space between the grooves of the two reinforcing bars, the lateral width direction of the backing material is substantially perpendicular to the central axis of the two reinforcing bars, and the width of the backing material Abuts against the side of the two reinforcing bars so that the direction is inclined with respect to the central axis of the two reinforcing bars;
A transmitting probe is arranged on one rib of any one of the reinforcing bars, and a receiving probe is arranged on the other rib so that the transmitting probe has a predetermined refraction angle. A method of transmitting ultrasonic waves toward the weld joint. 前記裏当て材は、前記２本の鉄筋の開先近傍にて前記２本の鉄筋の側面と当接している、請求項５に記載の方法。   The method according to claim 5, wherein the backing material is in contact with a side surface of the two reinforcing bars in the vicinity of a groove of the two reinforcing bars. 中心軸を挟んで対向するように２本の直線状のリブが各々に形成されており、サイズが異なる２本の鉄筋を、略Ｕ字形に湾曲した金属製の帯状の裏当て材を用いて突合せ溶接して、前記２本の鉄筋の間に形成された溶接継手を超音波を用いて探傷検査する方法であって、
前記２本の鉄筋の中心軸が略平行に位置し、前記２本の鉄筋の開先間の距離が所定のルート間隔となるように前記２本の鉄筋を配置する第１工程と、
前記２本の鉄筋の中心軸が略同一線上に位置するように、前記２本の鉄筋の中心軸を合わせる第２工程と、
前記裏当て材が前記２本の鉄筋の開先間の空間を囲うと共に、前記裏当て材の横幅方向が前記２本の鉄筋の中心軸と略垂直であり、前記裏当て材の帯幅方向が前記２本の鉄筋の中心軸に対して傾くように、前記裏当て材を前記２本の鉄筋の側面と当接させて、前記２本の鉄筋の何れかに前記裏当て材を仮付け溶接する第３工程と、
前記２本の鉄筋の開先間を本溶接して、前記２本の鉄筋間に前記溶接継手を形成する第４工程と、
何れかの鉄筋の一方のリブ上に送信側の探触子を配置し、他方のリブ上に受信側の探触子を配置して、前記送信側の探触子から、所定の屈折角で前記溶接継手に向けて超音波を送信する第５工程と含む方法。 Two linear ribs are formed on each other so as to face each other across the central axis, and two reinforcing bars of different sizes are used using a metal belt-like backing material curved in a substantially U shape A method of performing a flaw detection inspection using ultrasonic waves on a welded joint formed between the two rebars by butt welding,
A first step of arranging the two reinforcing bars so that the central axes of the two reinforcing bars are positioned substantially parallel and the distance between the grooves of the two reinforcing bars is a predetermined route interval;
A second step of aligning the central axes of the two reinforcing bars so that the central axes of the two reinforcing bars are located substantially on the same line;
The backing material surrounds the space between the two reinforcing bars, and the lateral width direction of the backing material is substantially perpendicular to the central axis of the two reinforcing bars, and the width direction of the backing material The backing material is temporarily attached to one of the two reinforcing bars by bringing the backing material into contact with a side surface of the two reinforcing bars so that is inclined with respect to the central axis of the two reinforcing bars. A third step of welding;
A fourth step of performing main welding between the grooves of the two reinforcing bars and forming the welded joint between the two reinforcing bars;
A transmitting probe is arranged on one rib of any one of the reinforcing bars, and a receiving probe is arranged on the other rib so that the transmitting probe has a predetermined refraction angle. And a fifth step of transmitting ultrasonic waves toward the weld joint . 前記第３工程では、前記２本の鉄筋の開先近傍にて前記２本の鉄筋の側面と当接するように、前記裏当て材が仮付け溶接される、請求項７に記載の方法。   The method according to claim 7, wherein, in the third step, the backing material is tack welded so as to come into contact with a side surface of the two reinforcing bars in the vicinity of a groove of the two reinforcing bars.
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