WO2021054187A1 - Pressure welding jig for reinforcing bars - Google Patents

Pressure welding jig for reinforcing bars Download PDF

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Publication number
WO2021054187A1
WO2021054187A1 PCT/JP2020/033845 JP2020033845W WO2021054187A1 WO 2021054187 A1 WO2021054187 A1 WO 2021054187A1 JP 2020033845 W JP2020033845 W JP 2020033845W WO 2021054187 A1 WO2021054187 A1 WO 2021054187A1
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reinforcing bars
pressure welding
diameter
pressure
welding
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PCT/JP2020/033845
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French (fr)
Japanese (ja)
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成行 林
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成行 林
株式会社アイ・エフ・プランニング
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Priority to JP2019168328A priority Critical patent/JP2021045760A/en
Priority to JP2019-168328 priority
Application filed by 成行 林, 株式会社アイ・エフ・プランニング filed Critical 成行 林
Publication of WO2021054187A1 publication Critical patent/WO2021054187A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12Mounting of reinforcing inserts; Prestressing

Abstract

[Problem] To make it possible, when pressure-welding reinforcing bars, to perform the pressure welding efficiently at a low cost while ensuring reliability of the welding strength between the reinforcing bars and minimizing an increase in the outside diameter of the weld part. [Solution] In a reinforcing bar pressure welding operation, a method is used in which: after a heating step for butting, against each other, mutually facing connection-side end parts of two reinforcing bars B, B held in a coaxial manner and applying heat, and immediately before a pressure-welding step, a C-shaped outside-diameter-restricting part 2 of a pressure-contact jig 1 is fitted around one of the reinforcing bars B from the side of the reinforcing bar B; in the pressure-welding step, welding is performed while restricting an increase in diameter of the weld part at which the two reinforcing bars B, B are welded, with the outside-diameter-restricting part 2 of the pressure-contact jig 1 having been made to slide in the axial direction and being held on the radially outer side of the connection-side end parts of the two reinforcing bars B, B; and after the end of the pressure-welding step, the outside-diameter-restricting part 2 of the pressure-contact jig 1 is made to slide in reverse and detached to the side of one of the reinforcing bars B. It is thereby made possible to perform the pressure welding operation efficiently at a low cost while ensuring reliability of the welding strength between the connected reinforcing bars B, B and minimizing an increase in the outside diameter of the weld part.

Description

鉄筋用圧接治具Pressure welding jig for reinforcing bars
本発明は、コンクリートに埋設する各種鉄筋を接続する圧接方法に用いられる鉄筋用圧接治具に関する。 The present invention relates to a pressure welding jig for reinforcing bars used in a pressure welding method for connecting various reinforcing bars embedded in concrete.
コンクリート構造物の柱や梁等に埋設する各種鉄筋を軸方向に接続する方法として、ガス圧接方法が建築現場等で広く採用されている。 The gas pressure welding method is widely adopted at construction sites and the like as a method of axially connecting various reinforcing bars to be embedded in columns and beams of a concrete structure.
鉄筋のガス圧接方法は、互いに接続しようとする鉄筋を同軸に保持した状態で、両鉄筋の接続側端部を突き合わせて加熱する加熱工程と、加熱工程後の両鉄筋に軸方向の圧力を加えて両鉄筋の接続側端部どうしを接合する圧接工程とによって実施される。 The gas pressure welding method of the reinforcing bars is a heating process in which the connecting side ends of both reinforcing bars are abutted and heated while the reinforcing bars to be connected to each other are held coaxially, and axial pressure is applied to both reinforcing bars after the heating process. It is carried out by a pressure welding step of joining the connecting side ends of both reinforcing bars.
このようなガス圧接方法において、鉄筋の接合部の強度を高めるために、予め、互いに接続しようとする鉄筋の一方に、管状でその中間部の内径が両端の鉄筋挿通孔よりも大きく形成された接続用被覆部材を外嵌しておき、加熱工程後の圧接工程では、両鉄筋の接続側端部を覆う位置に接続用被覆部材を移動させた状態で両鉄筋に軸方向の圧力を加えることにより、両鉄筋の接続側端部どうしを接合するとともに、その接合部を径方向外側へ拡大して接続用被覆部材の内部を充填する方法が提案されている(例えば、特許文献1参照。)。 In such a gas pressure welding method, in order to increase the strength of the joints of the reinforcing bars, one of the reinforcing bars to be connected to each other is formed in advance with a tubular shape and an inner diameter of the middle portion larger than the reinforcing bar insertion holes at both ends. In the pressure welding process after the heating process, the connecting covering member is fitted on the outside, and axial pressure is applied to both reinforcing bars while the connecting covering member is moved to a position that covers the connecting side ends of both reinforcing bars. Therefore, a method has been proposed in which the connecting end portions of both reinforcing bars are joined to each other and the joint portion is expanded outward in the radial direction to fill the inside of the connecting covering member (see, for example, Patent Document 1). ..
しかし、上記の接続用被覆部材を用いたガス圧接方法では、鉄筋の接続を行うごとに接続用被覆部材を消費することになるため、圧接作業にかかるコストが高くなるという問題がある。また、接続した鉄筋は、その接合部が接続用被覆部材で覆われて接合状態の良否を外部から目視確認することができない。さらに、その接合部の外径が接続用被覆部材の分だけ従来よりも大径となるので、配筋作業時にフープ筋やスターラップ筋の移動が困難になって作業性の低下をまねく場合がある。 However, the gas pressure welding method using the connection covering member described above consumes the connection covering member each time the reinforcing bars are connected, so that there is a problem that the cost of the pressure welding work increases. Further, the joint portion of the connected reinforcing bar is covered with the connecting covering member, and the quality of the joint state cannot be visually confirmed from the outside. Furthermore, since the outer diameter of the joint is larger than before by the amount of the connecting covering member, it may be difficult to move the hoop muscles and stirrup muscles during the reinforcement work, which may lead to a decrease in workability. is there.
これに対して、本発明者は、鉄筋のガス圧接方法において、加熱工程後に、上記の接続用被覆部材に代わる筒状の外径規制金具を用いて圧接工程を行い、その外径規制金具を圧接工程終了後に接続した鉄筋から取り外す方法を提案している(特許文献2参照。)。この方法によれば、外径規制金具を繰り返し使用できるので、従来の接続用被覆部材を用いる場合に比べて圧接作業のコストを抑えることができる。また、接続した鉄筋は、外径規制金具を取り除いた後に接合部を目視確認できるので、接合強度の信頼性を確保することができるし、接続用被覆部材を用いた場合よりも接合部の外径の拡大が抑えられるので、配筋作業の際に取り扱いやすいものとなる。 On the other hand, in the gas pressure welding method for reinforcing bars, the present inventor performs a pressure welding process using a tubular outer diameter regulating metal fitting instead of the above-mentioned connecting covering member after the heating process, and obtains the outer diameter regulating metal fitting. We have proposed a method of removing from the connected reinforcing bar after the pressure welding process is completed (see Patent Document 2). According to this method, since the outer diameter regulating metal fitting can be used repeatedly, the cost of the pressure welding work can be suppressed as compared with the case where the conventional connecting covering member is used. Further, since the joint portion of the connected reinforcing bar can be visually confirmed after removing the outer diameter regulating metal fitting, the reliability of the joint strength can be ensured, and the joint portion is outside the joint portion as compared with the case where the connecting covering member is used. Since the expansion of the diameter is suppressed, it becomes easy to handle during the bar arrangement work.
特許第2829844号公報Japanese Patent No. 2829844 特許第5970169号公報Japanese Patent No. 5970169
ところで、上記特許文献2の圧接方法では、筒状の外径規制金具を軸方向に沿って二つ割り可能な構造とし、互いに接続しようとする鉄筋の一方への外嵌や、圧接工程終了後の鉄筋からの取り外しが自由にできるようにしている。具体的には、外径規制金具を一対の半割筒体に分割し、各半割筒体の周方向両端に径方向外側に広がる板状取付部を設け、各半割筒体の板状取付部どうしを対向させた状態でボルトとナットで結合する構造とし、その一方の半割筒体の周方向一端の板状取付部に把手を設けている。 By the way, in the pressure welding method of Patent Document 2, the tubular outer diameter regulating metal fitting has a structure that can be divided into two along the axial direction, and the outer fitting to one of the reinforcing bars to be connected to each other and the reinforcing bar after the pressure welding process is completed. It can be freely removed from. Specifically, the outer diameter regulating metal fittings are divided into a pair of half-split cylinders, and plate-shaped mounting portions extending radially outward are provided at both ends in the circumferential direction of each half-split cylinder, and each half-split cylinder has a plate shape. The structure is such that the mounting portions are connected to each other with bolts and nuts while facing each other, and a handle is provided on the plate-shaped mounting portion at one end in the circumferential direction of one of the half-split cylinders.
しかしながら、この圧接方法で使用する外径規制金具は、接続対象の鉄筋の一方へ取り付ける際および圧接工程終了後に接続した鉄筋から取り外す際に、ボルトとナットの結合を緩めたり締めたりする必要がある。そして、この外径規制金具の取り付け、取り外しが作業者にとって非常に面倒で、圧接作業全体の効率を低下させる一因となっている。 However, the outer diameter regulating metal fittings used in this pressure welding method need to loosen or tighten the bolt-nut connection when attaching to one of the reinforcing bars to be connected and when removing from the connected reinforcing bars after the pressure welding process is completed. .. The installation and removal of the outer diameter regulating metal fittings are extremely troublesome for the operator, which is one of the factors that reduce the efficiency of the entire pressure welding operation.
そこで、本発明は、鉄筋を圧接する際に、鉄筋の接合強度の信頼性を確保し、かつ接合部の外径の拡大を抑えながら、圧接作業を低コストで効率よく行うことができるようにすることを課題とする。 Therefore, according to the present invention, when pressure welding of reinforcing bars, the pressure welding work can be efficiently performed at low cost while ensuring the reliability of the joint strength of the reinforcing bars and suppressing the expansion of the outer diameter of the joint portion. The task is to do.
上記の課題を解決するため、本発明は、互いに接続しようとする鉄筋を同軸に保持し、その両鉄筋の接続側端部を突き合わせて加熱した後、両鉄筋に軸方向の圧力を加えることにより両鉄筋を接続する鉄筋の圧接方法に使用される鉄筋用圧接治具において、周方向の一箇所に前記鉄筋の外径よりも広い開口を有するC字状の外径規制部と、前記外径規制部の外周から径方向と平行に延びる把手とからなり、前記外径規制部は、前記両鉄筋に軸方向の圧力を加えて両鉄筋の接続側端部どうしを接合する際に、その接合部の径方向外側で保持されて接合部の拡径を規制する構成を採用したものである。 In order to solve the above problems, the present invention holds the reinforcing bars to be connected to each other coaxially, abuts the connecting side ends of the two reinforcing bars to heat them, and then applies axial pressure to both reinforcing bars. In a reinforcing bar pressure welding jig used for a reinforcing bar pressure welding method for connecting both reinforcing bars, a C-shaped outer diameter regulating portion having an opening wider than the outer diameter of the reinforcing bar at one position in the circumferential direction and the outer diameter It consists of a handle that extends parallel to the radial direction from the outer circumference of the regulating portion, and the outer diameter regulating portion joins the connecting side ends of both reinforcing bars when axial pressure is applied to both reinforcing bars. A configuration is adopted in which the portion is held on the radial outside of the portion to regulate the expansion of the diameter of the joint portion.
すなわち、鉄筋の圧接作業において、同軸に保持した両鉄筋の互いに対向する接続側端部を突き合わせて加熱する加熱工程の後、圧接工程で両鉄筋に軸方向の圧力を加える際に、本発明の鉄筋用圧接治具(以下、単に「圧接治具」とも称する。)の外径規制部を両鉄筋の接続側端部の径方向外側で保持して、両鉄筋の接合部の拡径を規制しながら接合を行い、圧接工程終了後に圧接治具を接続した鉄筋から取り外すようにすることにより、前述の外径規制金具を用いた場合と同様、接続した鉄筋の接合強度の信頼性を確保し、かつ接合部の外径の拡大を抑えることができ、圧接作業のコストも抑えられる。 That is, in the pressure welding work of the reinforcing bars, after the heating step of abutting and heating the connecting side ends of the two reinforcing bars held coaxially with each other, the axial pressure is applied to both the reinforcing bars in the pressure welding step of the present invention. The outer diameter regulating portion of the pressure welding jig for reinforcing bars (hereinafter, also simply referred to as “pressure welding jig”) is held on the radial outside of the connection side end of both reinforcing bars to regulate the expansion of the diameter of the joint portion of both reinforcing bars. By joining the reinforcing bars while joining and removing the pressure welding jig from the connected reinforcing bars after the pressure welding process is completed, the reliability of the joining strength of the connected reinforcing bars is ensured as in the case of using the above-mentioned outer diameter regulating metal fittings. In addition, the expansion of the outer diameter of the joint can be suppressed, and the cost of pressure welding work can also be suppressed.
しかも、本発明の圧接治具は、その外径規制部が鉄筋の外径よりも広い開口を有するC字状に形成されているので、圧接工程の前に鉄筋に対してその側方から容易に外嵌できるし、圧接工程終了後も鉄筋の接合部から軸方向にスライドさせることにより鉄筋の側方へ容易に取り外すことができ、前述の外径規制金具を用いた場合よりも圧接作業全体の効率を向上させることができる。 Moreover, since the outer diameter regulating portion of the pressure welding jig of the present invention is formed in a C shape having an opening wider than the outer diameter of the reinforcing bar, it is easy from the side of the reinforcing bar before the pressure welding process. It can be externally fitted to the reinforcing bar, and even after the pressure welding process is completed, it can be easily removed to the side of the reinforcing bar by sliding it in the axial direction from the joint of the reinforcing bar. Efficiency can be improved.
ここで、前記外径規制部の内周面を、少なくとも軸方向の一部が一端に向かって広がるテーパ面とすれば、圧接治具が圧接工程終了後の鉄筋の接合部から軸方向にスライドさせやすくなり、圧接治具の取り外し作業が一層容易に行えるようになる。 Here, if the inner peripheral surface of the outer diameter regulating portion is a tapered surface in which at least a part in the axial direction expands toward one end, the pressure welding jig slides in the axial direction from the joint portion of the reinforcing bar after the pressure welding process is completed. This makes it easier to remove the pressure welding jig.
本発明の鉄筋用圧接治具は、上述したように、互いに接続しようとする鉄筋の外径よりも広い開口を有するC字状の外径規制部を有するものであるから、鉄筋の圧接作業の際には鉄筋に対してその側方から容易に外嵌でき、圧接工程終了後には接続した鉄筋から容易に取り外すことができる。すなわち、鉄筋の圧接方法において、本発明の圧接治具を用いることにより、鉄筋の接合強度の信頼性を確保し、接合部の外径の拡大を抑えながら、圧接作業を低コストで効率よく行えるようになる。 As described above, the pressure welding jig for reinforcing bars of the present invention has a C-shaped outer diameter regulating portion having an opening wider than the outer diameter of the reinforcing bars to be connected to each other. In some cases, it can be easily fitted to the reinforcing bar from the side thereof, and can be easily removed from the connected reinforcing bar after the pressure welding process is completed. That is, in the pressure welding method of the reinforcing bar, by using the pressure welding jig of the present invention, the pressure welding work can be efficiently performed at low cost while ensuring the reliability of the joint strength of the reinforcing bar and suppressing the expansion of the outer diameter of the joint portion. Will be.
実施形態の圧接治具の要部の側面図Side view of the main part of the pressure welding jig of the embodiment 図1の正面図Front view of FIG. 図1のIII-III線に沿った断面図Sectional view taken along line III-III of FIG. 図1の圧接治具を用いた鉄筋の圧接方法における加熱工程を示す正面図The front view which shows the heating process in the pressure welding method of the reinforcing bar using the pressure welding jig of FIG. 圧接工程開始前の圧接治具の鉄筋への外嵌状態を示す正面図Front view showing the outer fitting state of the pressure welding jig to the reinforcing bar before the start of the pressure welding process. 圧接治具を用いた圧接工程を示す正面図Front view showing a pressure welding process using a pressure welding jig 圧接工程終了後の圧接治具を取り外す過程を示す正面図Front view showing the process of removing the pressure welding jig after the pressure welding process is completed. 接続した鉄筋の背面図Rear view of connected rebar
以下、図面に基づき本発明の実施形態を説明する。この鉄筋用圧接治具1は、図1乃至図3に示すように、周方向の一箇所に接続しようとする鉄筋Bの外径よりも広い開口2aを有するC字状に形成された外径規制部2と、外径規制部2の外周から径方向と平行に延びる棒状の把手3とからなる。その外径規制部2の内周面は、軸方向の一端側部分が一端に向かって広がるテーパ面2bとなっており、そのテーパ面2bには多数の軸方向溝2cが形成されている。一方、外径規制部2の開口2aは軸方向に一定の幅で延び、その両側壁は軸方向溝のない平坦面とされている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the pressure welding jig 1 for reinforcing bars has a C-shaped outer diameter having an opening 2a wider than the outer diameter of the reinforcing bar B to be connected at one position in the circumferential direction. It is composed of a regulating portion 2 and a rod-shaped handle 3 extending in parallel with the radial direction from the outer circumference of the outer diameter regulating portion 2. The inner peripheral surface of the outer diameter regulating portion 2 is a tapered surface 2b in which one end side portion in the axial direction expands toward one end, and a large number of axial grooves 2c are formed in the tapered surface 2b. On the other hand, the opening 2a of the outer diameter regulating portion 2 extends with a constant width in the axial direction, and both side walls thereof are flat surfaces without axial grooves.
前記外径規制部2の内径は、軸方向の他端側のストレート部分が開口2aの広さと同じ寸法に形成され、テーパ面2bの最大径(一端における内径)が鉄筋Bの外径の1.1~1.3倍前後、好ましくは1.2倍前後に形成されている。 Regarding the inner diameter of the outer diameter regulating portion 2, the straight portion on the other end side in the axial direction is formed to have the same size as the width of the opening 2a, and the maximum diameter of the tapered surface 2b (inner diameter at one end) is 1 of the outer diameter of the reinforcing bar B. It is formed around 1 to 1.3 times, preferably around 1.2 times.
なお、鉄筋には異形鉄筋やストレート鉄筋等のいくつかの種類があり、その各種の鉄筋について外径の異なるものがあるため、圧接治具は、これら各鉄筋の外径に対応した内径のものを複数用意しておき、実際に接続しようとする鉄筋に応じたものを使用するようにすればよい。 There are several types of reinforcing bars such as deformed reinforcing bars and straight reinforcing bars, and some of the various reinforcing bars have different outer diameters. Therefore, the pressure welding jig has an inner diameter corresponding to the outer diameter of each of these reinforcing bars. It is sufficient to prepare a plurality of the reinforcing bars and use the one corresponding to the reinforcing bar to be actually connected.
次に、上記構成の圧接治具1と一般的なガス圧接装置およびバーナーを用いた鉄筋Bの圧接方法について説明する。そのガス圧接装置は、図示は省略するが、圧接装置本体となる外筒の一端側外部に一方の鉄筋を着脱自在に固定する固定クランプと、他端側外部に他方の鉄筋を着脱自在に固定する移動クランプと、外筒の内部に軸方向に移動可能となるよう収納した内筒とを備え、外筒の他端部に連結された油圧シリンダで内筒を押すことにより、移動クランプを固定クランプに接近させる構造のものである。 Next, a pressure welding method of the reinforcing bar B using the pressure welding jig 1 having the above configuration, a general gas pressure welding device, and a burner will be described. Although not shown, the gas pressure welding device has a fixed clamp that detachably fixes one reinforcing bar to the outside of one end side of the outer cylinder that is the main body of the pressure welding device, and the other reinforcing bar that is detachably fixed to the outside of the other end side. The moving clamp is provided with a moving clamp to be moved and an inner cylinder housed inside the outer cylinder so as to be movable in the axial direction. The moving clamp is fixed by pushing the inner cylinder with a hydraulic cylinder connected to the other end of the outer cylinder. It has a structure that brings it closer to the clamp.
この圧接方法では、予め、接続しようとする鉄筋B、Bの接続側端部を鉄筋冷間直角切断機で切断するか端面を研削して平滑面としておく。そして、まず、一方の鉄筋Bをガス圧接装置の固定クランプに締め付けボルトで固定し、他方の鉄筋Bを移動クランプに締め付けボルトで固定して両鉄筋B、Bを同軸に保持し、バーナーで両鉄筋B、Bの接続側端部を加熱する加熱工程を行う。バーナーでの加熱にはアセチレンガス、酸素ガス、天然ガス、水素ガス等が使用される。なお、バーナー加熱に代えて高周波加熱を採用することもできる。 In this pressure welding method, the connecting side ends of the reinforcing bars B and B to be connected are cut in advance with a reinforcing bar cold right-angle cutting machine or the end faces are ground to make a smooth surface. Then, first, one reinforcing bar B is fixed to the fixing clamp of the gas pressure welding device with a tightening bolt, the other reinforcing bar B is fixed to the moving clamp with a tightening bolt, both reinforcing bars B and B are held coaxially, and both are held by a burner. A heating step is performed to heat the connecting side ends of the reinforcing bars B and B. Acetylene gas, oxygen gas, natural gas, hydrogen gas, etc. are used for heating with a burner. It should be noted that high frequency heating can be adopted instead of the burner heating.
加熱工程は、両鉄筋B、Bの接続側端部どうしが近接する状態で加熱する第1加熱工程と、図4に示すように、第1加熱工程後の両鉄筋B、Bの接続側端部どうしを突き合わせて、両鉄筋B、Bに軸方向の圧力を加えた状態で加熱する第2加熱工程とからなる。ここで、その両鉄筋B、Bの接続側端部の加熱範囲は、各鉄筋B、Bの端面から鉄筋Bの外径の0.15~0.3倍程度の長さまでの範囲とする。なお、第2加熱工程では、互いに突き合わされた両鉄筋B、Bの接続側端部が、軸方向の圧力によってわずかに径方向外側へ拡大(拡径)する。 The heating steps include a first heating step in which the connecting side ends of both reinforcing bars B and B are close to each other, and as shown in FIG. 4, the connecting side ends of both reinforcing bars B and B after the first heating step. It consists of a second heating step in which the portions are butted against each other and heated in a state where axial pressure is applied to both reinforcing bars B and B. Here, the heating range of the connecting side ends of the two reinforcing bars B and B is a range from the end faces of the reinforcing bars B and B to a length of about 0.15 to 0.3 times the outer diameter of the reinforcing bars B. In the second heating step, the connecting side ends of the two reinforcing bars B and B that are butted against each other are slightly expanded (diameter expanded) outward in the radial direction due to the axial pressure.
加熱工程によって両鉄筋B、Bの接続側端部を軟化させた後、圧接治具1を用いた圧接工程を行う。この圧接工程では、まず、図5に示すように、一方の鉄筋Bの接続側端部の近傍位置に圧接治具1の外径規制部2を鉄筋Bの側方から外嵌し(図1参照)、その外径規制部2を両鉄筋B、Bの接続側端部に向けてスライドさせる。 After the connecting side ends of both reinforcing bars B and B are softened by the heating step, the pressure welding process using the pressure welding jig 1 is performed. In this pressure welding step, first, as shown in FIG. 5, the outer diameter regulating portion 2 of the pressure welding jig 1 is externally fitted from the side of the reinforcing bar B at a position near the connection side end portion of one of the reinforcing bars B (FIG. 1). (See), the outer diameter regulating portion 2 is slid toward the connecting side ends of both reinforcing bars B and B.
そして、図6に示すように、圧接治具1の外径規制部2を両鉄筋B、Bの接続側端部の径方向外側で保持した状態で、ガス圧接装置の油圧シリンダの加圧力を高めて両鉄筋B、Bに軸方向の圧力を加えることにより、両鉄筋B、Bの接続側端部どうしを接合して両鉄筋B、Bを接続する。このとき、接合部の径方向外側で保持された圧接治具1の外径規制部2が接合部の拡径を規制するので、接合部の拡径部分は互いに軸方向に加圧しあうことになり、この作用(鍛造効果)によって接続した鉄筋B、Bの接合強度が高まるようになっている。なお、外径規制部2の周方向の一箇所に開口2aがあっても鍛造効果が生じて接合強度が高まることは、実験により確認されている。 Then, as shown in FIG. 6, the pressure applied to the hydraulic cylinder of the gas pressure welding device is applied while the outer diameter regulating portion 2 of the pressure welding jig 1 is held on the radial outside of the connecting side ends of both reinforcing bars B and B. By raising and applying axial pressure to both reinforcing bars B and B, the connecting side ends of both reinforcing bars B and B are joined to connect both reinforcing bars B and B. At this time, since the outer diameter regulating portion 2 of the pressure welding jig 1 held on the radial outside of the joint portion regulates the diameter expansion of the joint portion, the diameter-expanded portions of the joint portion pressurize each other in the axial direction. As a result, the joint strength of the connected reinforcing bars B and B is increased by this action (forging effect). It has been experimentally confirmed that even if there is an opening 2a at one location in the circumferential direction of the outer diameter regulating portion 2, a forging effect is produced and the joint strength is increased.
圧接工程が終了すると、ガス圧接装置の油圧シリンダヘの油圧の供給を停止して、図7に示すように、圧接治具1の外径規制部2を一方の鉄筋Bの側へスライドさせて両鉄筋B、Bの接合部から引き離した後、一方の鉄筋Bの側方へ取り外せばよい(図1参照)。このとき、圧接治具1は、外径規制部2の内周面のうち、両鉄筋B、Bの接合部の拡径を規制する部分が一端に向かって広がるテーパ面2bとなっているので、容易に接合部からスライドさせて取り外すことができる。そして、圧接治具1を取り外した後、接続した鉄筋B、Bの接合部の接合状態を目視確認することにより、圧接作業全体が完了する。 When the pressure welding process is completed, the supply of flood pressure to the hydraulic cylinder of the gas pressure welding device is stopped, and as shown in FIG. 7, the outer diameter regulating portion 2 of the pressure welding jig 1 is slid toward one of the reinforcing bars B. After pulling it away from the joint of the reinforcing bars B and B, it may be removed to the side of one of the reinforcing bars B (see FIG. 1). At this time, the pressure welding jig 1 has a tapered surface 2b in which the portion of the inner peripheral surface of the outer diameter regulating portion 2 that regulates the diameter expansion of the joint portion of both reinforcing bars B and B expands toward one end. , Can be easily removed by sliding from the joint. Then, after removing the pressure welding jig 1, the entire pressure welding operation is completed by visually checking the joint state of the jointed portions of the connected reinforcing bars B and B.
上述したように、この圧接治具1を用いた圧接方法では、加熱工程を実施した後、両鉄筋B、Bに軸方向の圧力を加えて両鉄筋B、Bの接続側端部どうしを接合する圧接工程において、その接合部の径方向外側に圧接治具1の外径規制部2を保持して接合部の拡径を規制し、圧接工程終了後に圧接治具1を取り外すようにしたので、両鉄筋B、Bの接合部の強度を鍛造効果で高めることができ、圧接治具1の繰り返し使用により圧接作業のコストを抑えることもできる。また、接続した鉄筋B、Bは、圧接治具1を取り除いた後に接合部を目視確認できるので、接合強度の信頼性を確保できるし、接合部の外径の拡大を抑えられるので、配筋作業の際に取り扱いやすいものとなる。 As described above, in the pressure welding method using the pressure welding jig 1, after performing the heating step, axial pressure is applied to both reinforcing bars B and B to join the connecting side ends of both reinforcing bars B and B. In the pressure welding process, the outer diameter regulating portion 2 of the pressure welding jig 1 is held outside the joint in the radial direction to regulate the expansion of the diameter of the joint, and the pressure welding jig 1 is removed after the pressure welding process is completed. , The strength of the joint portion of both reinforcing bars B and B can be increased by the forging effect, and the cost of the pressure welding work can be suppressed by repeatedly using the pressure welding jig 1. Further, since the joints of the connected reinforcing bars B and B can be visually confirmed after the pressure welding jig 1 is removed, the reliability of the joint strength can be ensured and the expansion of the outer diameter of the joint can be suppressed, so that the reinforcing bars are arranged. It will be easy to handle during work.
しかも、圧接治具1は、その外径規制部2が鉄筋Bの外径よりも広い開口2aを有し、圧接工程の直前に鉄筋Bに対してその側方から容易に外嵌でき、また圧接工程終了後には接続した鉄筋B、Bから容易に取り外すことができるので、圧接作業全体の作業性を向上させることができる。 Moreover, the pressure welding jig 1 has an opening 2a in which the outer diameter regulating portion 2 is wider than the outer diameter of the reinforcing bar B, and can be easily fitted to the reinforcing bar B from the side immediately before the pressure welding process. After the pressure welding process is completed, the reinforcing bars B and B can be easily removed, so that the workability of the entire pressure welding operation can be improved.
ここで、図8は、圧接治具1を取り外した後の鉄筋B、Bを背面側(圧接治具1の外径規制部2の開口2aに臨む側と反対の側)から見たものである。接続した鉄筋B、Bの接合部には軸方向に延びる筋状の圧痕Aが複数形成されている。この筋状の圧痕Aは、圧接工程で圧接治具1の外径規制部2に囲まれていた接合部が、外径規制部2の内周面の軸方向溝2cどうしの間の凸部に押し付けられることによって形成されている。 Here, FIG. 8 is a view of the reinforcing bars B and B after the pressure welding jig 1 is removed from the back surface side (the side opposite to the side facing the opening 2a of the outer diameter regulating portion 2 of the pressure welding jig 1). is there. A plurality of streaky indentations A extending in the axial direction are formed at the joints of the connected reinforcing bars B and B. In this streak-shaped indentation A, the joint portion surrounded by the outer diameter regulating portion 2 of the pressure welding jig 1 in the pressure welding process is a convex portion between the axial grooves 2c on the inner peripheral surface of the outer diameter regulating portion 2. It is formed by being pressed against.
したがって、建設現場等で予め接続された鉄筋を埋設しようとする際にその接続方法が不明の場合でも、鉄筋の接合部に筋状の圧痕が認められれば、その鉄筋が本発明の圧接治具を用いて接続されたもの、すなわち十分な接合強度を有するものであると推定できることになる。 Therefore, even if the connection method is unknown when burying a reinforcing bar previously connected at a construction site or the like, if a streak-like indentation is found at the joint of the reinforcing bar, the reinforcing bar is the pressure welding jig of the present invention. It can be estimated that they are connected using the above, that is, they have sufficient joint strength.
なお、鉄筋の接続方法を判別するための接合部の外観は上述したような筋状の圧痕に限らず、例えば、圧接治具の外径規制部の内周面を正六角形や正八角形等の多角形の一部が欠けた形状として、鉄筋の接合部全体が略多角形状に形成されるようにしてもよい。 The appearance of the joint for determining the connection method of the reinforcing bar is not limited to the streak-shaped indentation as described above. For example, the inner peripheral surface of the outer diameter regulating portion of the pressure welding jig may be a regular hexagon or a regular octagon. As a shape in which a part of the polygon is missing, the entire joint portion of the reinforcing bar may be formed into a substantially polygonal shape.
今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。この発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
例えば、圧接治具の外径規制部の内周面は、実施形態のように少なくとも一部をテーパ面とした方が圧接工程後の圧接治具の取り外しが容易になって好ましいが、全面を直円筒面とすることもできる。また、その外径規制部の内周面の軸方向溝を省略することもできる。 For example, it is preferable that at least a part of the inner peripheral surface of the outer diameter regulating portion of the pressure welding jig is a tapered surface as in the embodiment because the pressure welding jig can be easily removed after the pressure welding process. It can also be a straight cylindrical surface. Further, the axial groove on the inner peripheral surface of the outer diameter regulating portion can be omitted.
また、本発明の圧接治具は、鉄筋の圧接を対象としてなされたものであるが、鉄筋以外の棒状部材や筒状部材等の圧接にも使用することができる。 Further, although the pressure welding jig of the present invention is intended for pressure welding of reinforcing bars, it can also be used for pressure welding of rod-shaped members, tubular members, etc. other than reinforcing bars.
1 圧接治具
2 外径規制部
2a 開口
2b テーパ面
2c 軸方向溝
3 把手
A 圧痕
B 鉄筋

 
1 Pressure welding jig 2 Outer diameter regulation part 2a Opening 2b Tapered surface 2c Axial groove 3 Handle A Indentation B Reinforcing bar

Claims (2)

  1. 互いに接続しようとする鉄筋を同軸に保持し、その両鉄筋の接続側端部を突き合わせて加熱した後、両鉄筋に軸方向の圧力を加えることにより両鉄筋を接続する鉄筋の圧接方法に使用される鉄筋用圧接治具において、
    周方向の一箇所に前記鉄筋の外径よりも広い開口を有するC字状の外径規制部と、前記外径規制部の外周から径方向と平行に延びる把手とからなり、前記外径規制部は、前記両鉄筋に軸方向の圧力を加えて両鉄筋の接続側端部どうしを接合する際に、その接合部の径方向外側で保持されて接合部の拡径を規制するものであることを特徴とする鉄筋用圧接治具。
    It is used as a pressure welding method for reinforcing bars that connect both reinforcing bars by holding the reinforcing bars to be connected to each other coaxially, butting the connecting side ends of both reinforcing bars to heat them, and then applying axial pressure to both reinforcing bars. In the pressure welding jig for reinforcing bars
    It consists of a C-shaped outer diameter regulating portion having an opening wider than the outer diameter of the reinforcing bar at one location in the circumferential direction, and a handle extending in parallel with the radial direction from the outer circumference of the outer diameter regulating portion. When an axial pressure is applied to both reinforcing bars to join the connecting side ends of both reinforcing bars, the portion is held on the radial outside of the joint portion to regulate the diameter expansion of the joint portion. A pressure welding jig for reinforcing bars.
  2. 前記外径規制部の内周面は、少なくとも軸方向の一部が一端に向かって広がるテーパ面となっていることを特徴とする請求項1に記載の鉄筋用圧接治具。

     
    The pressure welding jig for reinforcing bars according to claim 1, wherein the inner peripheral surface of the outer diameter regulating portion is a tapered surface in which at least a part in the axial direction expands toward one end.

PCT/JP2020/033845 2019-09-17 2020-09-07 Pressure welding jig for reinforcing bars WO2021054187A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10175080A (en) * 1996-12-13 1998-06-30 Yasuo Shirokura Method for joining bar-shaped body
JP2013066927A (en) * 2011-09-26 2013-04-18 Shigeyuki Hayashi Pressure welding method for reinforcing bar

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10175080A (en) * 1996-12-13 1998-06-30 Yasuo Shirokura Method for joining bar-shaped body
JP2013066927A (en) * 2011-09-26 2013-04-18 Shigeyuki Hayashi Pressure welding method for reinforcing bar

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