JP4949486B2

JP4949486B2 - Reinforcing bar joint structure

Info

Publication number: JP4949486B2
Application number: JP2010000578A
Authority: JP
Inventors: 義則山代
Original assignee: 株式会社ワイビーテクノ
Priority date: 2010-01-05
Filing date: 2010-01-05
Publication date: 2012-06-06
Anticipated expiration: 2030-01-05
Also published as: JP2011140755A

Description

本発明は、鉄筋コンクリート構造などに使用する鉄筋の継手構造に関し、特に、鉄筋の機械式継手構造に関する。 The present invention relates to a joint structure for reinforcing bars used in a reinforced concrete structure, and more particularly to a mechanical joint structure for reinforcing bars.

一般に、鉄筋コンクリート構造物などに使用される鉄筋は、運搬や作業上の制約から所定の長さに切断されているため、軸方向に長い構造物を構築する場合には、複数の鉄筋をつなぎ合わせて使用している。そして、この場合に、複数の鉄筋を接続し、鉄筋に作用する力を伝達するための種々の継手構造が採られている。この鉄筋の継手構造には、接続する鉄筋を相互に突き合わせた後に接合する母材面に軸方向に圧縮応力を与えながらガス炎で加熱して接合するガス圧接式継手、鉄筋同士を溶接してつなぎ合わせる溶接式継手、鋼管スリーブを鉄筋表面のねじにねじ込んだり鋼管スリーブ内にモルタル若しくは樹脂を注入することによって締結する機械式継手などがある。 In general, reinforcing bars used for reinforced concrete structures are cut to a predetermined length due to restrictions on transportation and work, so when constructing a structure that is long in the axial direction, several reinforcing bars are connected together. Are used. In this case, various joint structures for connecting a plurality of reinforcing bars and transmitting forces acting on the reinforcing bars are employed. This rebar joint structure is made by welding gas rebar joints, which are joined by heating with a gas flame while applying compressive stress in the axial direction to the base metal surfaces to be joined after abutting the connecting rebars together. There are welded joints that join together, and mechanical joints that are fastened by screwing a steel pipe sleeve into a thread on the surface of a reinforcing bar or injecting mortar or resin into the steel pipe sleeve.

これらの継手のうち、機械式継手が特許文献１などに開示されている。この文献１は鉄筋の継手構造に関するもので、この継手構造は、相対する鉄筋同士を、鋼管からなる継手金具と有機グラウト材（例えばエポキシ樹脂、アクリル樹脂など）による接着剤を使用して接合する形式を採り、継手内部に特別な突起を設ける必要がなく、大掛かりな機材を使う必要もなく、施工誤差を容易に吸収できる鉄筋継手を提供するものである。 Among these joints, a mechanical joint is disclosed in Patent Document 1 and the like. This reference 1 relates to a joint structure of reinforcing bars, and this joint structure joins opposing reinforcing bars together using a joint fitting made of a steel pipe and an adhesive made of an organic grout material (for example, epoxy resin, acrylic resin, etc.). The present invention provides a reinforcing bar joint that can easily absorb construction errors without requiring special projections inside the joint and without using large-scale equipment.

特開２００４−３２４１１２公報JP 2004-324112 A

しかしながら、この種の継手構造では、特に、機械式継手構造の場合、鋼管スリーブやグラウト材などの鉄筋とは別の部品や材料が必要で、これらの部品、材料管理を併せて行わなければならない、という問題がある。 However, in this type of joint structure, especially in the case of a mechanical joint structure, parts and materials other than steel pipe sleeves and grouting materials such as steel bars are required, and these parts and materials must be managed together. There is a problem.

本発明は、このような従来の課題を解決するものであり、この種の鉄筋の継手構造において、つなぎ合わせる各鉄筋を各鉄筋の端部の機械加工により繋げるようにして、従来必要とされる鋼管スリーブやグラウト材など鉄筋とは別の部品や材料を不要とすること、を目的とする。 The present invention solves such a conventional problem, and in a joint structure of this type of reinforcing bar, it is conventionally required to connect the reinforcing bars to be joined together by machining the ends of the reinforcing bars. The purpose is to eliminate the need for parts and materials other than steel bars such as steel pipe sleeves and grout materials.

上記目的を達成するために、本発明の鉄筋の継手構造は、一方の鉄筋の端部に対して他方の鉄筋の端部が突き合わされて接合される鉄筋の継手構造において、前記一方の鉄筋の端部に機械加工により軸方向に向けて凹部が形成され、前記他方の鉄筋の端部に機械加工により軸方向に向けて凸部が形成され、前記凹部に対して前記凸部が冷やしばめ又は焼きばめ又は圧入により嵌め込まれて、前記各鉄筋が接合される、ことを要旨とする。
また、この鉄筋の継手構造では各部が次のように具体化される。
（１）一方の鉄筋の凹部は略テーパ形状又は略筒形形状に形成され、他方の鉄筋の凸部は略テーパ形状又は略筒形形状に形成される。
（２）一方の鉄筋の凹部及び他方の鉄筋の凸部にそれぞれ、軸方向に対して直交する方向に相互に連通可能な穴が貫通形成され、前記凹部に前記凸部が嵌め込まれた状態で前記凹部及び前記凸部の穴間に接合ピンが挿着される。なお、接合ピンははめ合い形状とする。 In order to achieve the above object, the reinforcing bar joint structure of the present invention is a reinforcing bar joint structure in which the end of one reinforcing bar is joined to the end of the other reinforcing bar. A concave portion is formed in the end portion in the axial direction by machining, a convex portion is formed in the end portion of the other reinforcing bar in the axial direction by machining, and the convex portion is cold-fitted to the concave portion. Alternatively, the gist is that the reinforcing bars are joined by shrink fitting or press fitting.
Further, in this reinforcing bar joint structure, each part is embodied as follows.
(1) The concave portion of one reinforcing bar is formed in a substantially tapered shape or a substantially cylindrical shape, and the convex portion of the other reinforcing bar is formed in a substantially tapered shape or a substantially cylindrical shape.
(2) In a state in which a hole that can communicate with each other in a direction orthogonal to the axial direction is formed in the concave portion of one reinforcing bar and the convex portion of the other reinforcing bar, and the convex portion is fitted in the concave portion. A joining pin is inserted between the recess and the hole of the protrusion. In addition, a joining pin shall be a fitting shape.

また、本発明の鉄筋の継手構造は、一方の鉄筋の端部に対して他方の鉄筋の端部が突き合わされて接合される鉄筋の継手構造において、前記一方の鉄筋の端部に機械加工により軸方向に向けて凹部が形成され、当該凹部の内周面にねじが切られ、前記他方の鉄筋の端部に機械加工により軸方向に向けて凸部が形成され、当該凸部の外周面にねじが切られ、前記凹部に対して前記凸部が接着剤を介してねじ締結により締め付けられて、前記各鉄筋が接合される、ことを要旨とする。
この場合、他方の鉄筋の端部に形成される凸部及びねじは、前記端部に機械加工により軸方向に向けて形成されるねじ穴と、前記ねじ穴に締結される接合ねじとからなり、前記ねじ穴に対して前記接合ねじが接着剤を介してねじ締結により固着されるようにしてもよい。
なお、この継手構造では、ねじに焼き付き防止の処置が施されることが好ましい。 The reinforcing bar joint structure according to the present invention is a reinforcing bar joint structure in which the end of one reinforcing bar is joined to the end of the other reinforcing bar by being machined into the end of the one reinforcing bar. A concave portion is formed in the axial direction, a screw is cut on the inner peripheral surface of the concave portion, a convex portion is formed in the axial direction by machining at the end of the other reinforcing bar, and the outer peripheral surface of the convex portion. The gist of the present invention is that the screws are cut, the protrusions are fastened to the recesses by screw fastening via an adhesive, and the rebars are joined.
In this case, the convex portion and the screw formed at the end of the other reinforcing bar include a screw hole formed in the end portion in the axial direction by machining and a joining screw fastened to the screw hole. The joining screw may be fixed to the screw hole by screw fastening via an adhesive.
In this joint structure, it is preferable that the screw is treated to prevent seizure.

本発明の鉄筋の継手構造によれば、一方の鉄筋の端部に機械加工により軸方向に向けて凹部を形成し、他方の鉄筋の端部に機械加工により軸方向に向けて凸部を形成し、凹部に対して凸部を冷やしばめ又は焼きばめ又は圧入により嵌め込んで、各鉄筋を接合するので、つなぎ合わせる一方及び他方の各鉄筋を各鉄筋の端部の機械加工により繋ぐことができ、従来必要とされる鋼管スリーブやグラウト材など鉄筋とは別の部品や材料を不要とすることができる、という効果を奏する。また、この場合、各鉄筋の端部を接合ピンにより結合することで、各鉄筋の接合をより向上させることができる、という利点がある。
また、本発明の鉄筋の継手構造によれば、一方の鉄筋の端部に機械加工により軸方向に向けて凹部及びねじを形成し、他方の鉄筋の端部に機械加工により軸方向に向けて凸部及びねじを形成し、これらの凹部と凸部を接着剤を介してねじ締結により接合するので、つなぎ合わせる一方及び他方の各鉄筋を各鉄筋の端部の機械加工により繋ぐことができる、という効果を奏する。 According to the reinforcing bar joint structure of the present invention, a concave portion is formed in the axial direction by machining at one end of the reinforcing bar, and a convex portion is formed by axial machining at the end of the other reinforcing bar. Then, the protrusions are fitted into the recesses by cold fitting, shrink fitting, or press fitting, and the respective reinforcing bars are joined, so that one and the other reinforcing bars to be joined are connected by machining the ends of the reinforcing bars. Thus, there is an effect that parts and materials different from the reinforcing bars such as a steel pipe sleeve and a grout material which are conventionally required can be eliminated. Moreover, in this case, there exists an advantage that joining of each rebar can be improved more by couple | bonding the edge part of each rebar with a joining pin.
Moreover, according to the reinforcing bar joint structure of the present invention, a recess and a screw are formed in the axial direction by machining at the end of one reinforcing bar, and the axial direction by machining at the end of the other reinforcing bar. Protrusions and screws are formed, and these recesses and protrusions are joined by screw fastening via an adhesive, so that one and the other rebars to be joined can be joined by machining at the end of each rebar, There is an effect.

本発明の第１の実施の形態における鉄筋の継手構造を示す図The figure which shows the joint structure of the reinforcing bar in the 1st Embodiment of this invention 本発明の第２の実施の形態における鉄筋の継手構造を示す図The figure which shows the joint structure of the reinforcing bar in the 2nd Embodiment of this invention 本発明の第３の実施の形態における鉄筋の継手構造を示す図The figure which shows the joint structure of the reinforcing bar in the 3rd Embodiment of this invention 本発明の第４の実施の形態における鉄筋の継手構造を示す図The figure which shows the joint structure of the reinforcing bar in the 4th Embodiment of this invention

次に、この発明を実施するための形態について図を用いて説明する。図１に第１の実施の形態を示している。図１に示すように、鉄筋の継手構造１は少なくとも上下（又は左右）２本の鉄筋１１、１２を備え、これらの鉄筋１１、１２が一方の鉄筋１１の端部に対し他方の鉄筋１２の端部が新たな継手形式により突き合わされて接合される。なお、この場合、鉄筋１１、１２は棒状の鋼材の表面にリブや節と呼ばれる凹凸の突起を設けた異形鉄筋、又は丸鋼のいずれでもよく、いずれの鉄筋にもこの継手形式を適用することができる。 Next, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. As shown in FIG. 1, the reinforcing bar joint structure 1 includes at least two upper and lower (or left and right) reinforcing bars 11 and 12, and these reinforcing bars 11 and 12 are connected to the end of one reinforcing bar 11 with respect to the other reinforcing bar 12. The ends are butted together and joined by a new joint type. In this case, the reinforcing bars 11 and 12 may be either deformed reinforcing bars provided with uneven projections called ribs or nodes on the surface of a rod-shaped steel material, or round steel, and this joint type is applied to any reinforcing bars. Can do.

この鉄筋の継手構造１では、一方の鉄筋１１の端部に機械加工により軸方向に向けて凹部１１０が形成され、他方の鉄筋１２の端部に機械加工により軸方向に向けて凸部１２１が形成され、これらの凹部１１０と凸部１２１がはめ合いによって接合される。この継手構造１の場合、一方の鉄筋１１において、接合側の端部の端面（中心）に凹部１１０が他端部に向けて所定の深さに漸次小径のテーパ形状に切削加工される。これに対して、他方の鉄筋１２においては、接合側の端部に凸部１２１が接合側の端部から他端部に向けて漸次大径のテーパ形状（つまり、先細のテーパ形状）に切削加工される。このとき、この凹部１１０内の空間のテーパ形状と凸部１２１のテーパ形状はそれぞれ相似形の関係になっていて、凹部１１０と凸部１２１は外形が同じで異なる大きさを有している。この場合、凹部１１０に対して凸部１２１が少し大きく形成される。そして、この凹部１１０に対して凸部１２１が冷やしばめにより接合される。この場合、図１中に示すように、凸部１２１が冷却媒体（この場合、Ｎ２（窒素）ガス）により所定の温度まで冷却されて凹部１１０内に嵌合可能に所定の外径まで収縮され、この縮径された凸部１２１が凹部１１０内に嵌め込まれる。そして、この凸部１２１は加熱により拡径されて凹部１１０に結合される。このようにしてこれらの鉄筋１１、１２はそれぞれ接合側端部を付き合わせて接合される。各鉄筋１１、１２の脱落（外れ）防止作用は、各鉄筋１１、１２の機械加工面、すなわちテーパ形状の凹部１１０とテーパ形状の凸部１２１の接触面の抵抗によりなされる。 In the reinforcing bar joint structure 1, a concave portion 110 is formed in the end portion of one reinforcing bar 11 in the axial direction by machining, and a convex portion 121 is formed in the end portion of the other reinforcing bar 12 in the axial direction by machining. The concave portions 110 and the convex portions 121 are joined by fitting. In the case of this joint structure 1, in one reinforcing bar 11, a concave portion 110 is cut into a tapered shape having a gradually smaller diameter at a predetermined depth on the end surface (center) of the end portion on the joining side toward the other end portion. On the other hand, in the other reinforcing bar 12, the convex portion 121 is cut into a tapered shape having a gradually larger diameter (that is, a tapered shape) from the joining side end to the other end at the joining side end. Processed. At this time, the tapered shape of the space in the concave portion 110 and the tapered shape of the convex portion 121 are similar to each other, and the concave portion 110 and the convex portion 121 have the same outer shape and different sizes. In this case, the convex portion 121 is formed slightly larger than the concave portion 110. And the convex part 121 is joined with respect to this recessed part 110 by cold fitting. In this case, as shown in FIG. 1, the convex portion 121 is cooled to a predetermined temperature by a cooling medium (in this case, N 2 (nitrogen) gas) and contracted to a predetermined outer diameter so as to be able to fit into the concave portion 110. The reduced-diameter convex portion 121 is fitted into the concave portion 110. And this convex part 121 is diameter-expanded by heating, and is couple | bonded with the recessed part 110. FIG. In this way, the reinforcing bars 11 and 12 are joined together with their joining end portions. The action of preventing the respective reinforcing bars 11 and 12 from falling off (detaching) is performed by the resistance of the machined surfaces of the reinforcing bars 11 and 12, that is, the contact surfaces of the tapered concave portion 110 and the tapered convex portion 121.

また、この鉄筋の継手構造１では、鉄筋同士をより確実につなぎ合わせるために、接合ピン１３を用いた脱落防止処置が採られている。この場合、一方の鉄筋１１の凹部１１０（の周面）及び他方の鉄筋１２の凸部１２１（の周面）にそれぞれ、軸方向に対して直交する方向に相互に連通可能な円筒形の穴１１２、１２２が貫通形成され、凹部１１０に対して凸部１２２が嵌め込まれた状態で、凹部１１０及び凸部１２１の穴１１２、１２２間に円筒形の接合ピン１３が挿着される。なお、接合ピン１３は端面が複数のポンチでノックされて、廻り止めが施される。 Further, in this reinforcing bar joint structure 1, in order to connect the reinforcing bars more reliably, a drop-off prevention measure using the joining pin 13 is taken. In this case, the cylindrical holes that can communicate with each other in the direction orthogonal to the axial direction, respectively, on the concave portion 110 (the peripheral surface) of the one reinforcing bar 11 and the convex portion 121 (the peripheral surface) of the other reinforcing bar 12. The cylindrical joining pin 13 is inserted between the holes 112 and 122 of the concave portion 110 and the convex portion 121 in a state where the 112 and 122 are formed through and the convex portion 122 is fitted into the concave portion 110. In addition, the end surface of the joining pin 13 is knocked by a plurality of punches to prevent rotation.

以上説明したように、この実施の形態によれば、上下（又は左右）の鉄筋１１、１２のうち、一方の鉄筋１１の端部に機械加工により軸方向に向けてテーパ形状の凹部１１０を形成し、他方の鉄筋１２の端部に機械加工により軸方向に向けてテーパ形状の凸部１２１を形成し、凹部１１０に対して凸部１２１を冷やしばめにより嵌め込んで、各鉄筋１１、１２を接合するので、つなぎ合わせる一方及び他方の各鉄筋１１、１２を各鉄筋１１、１２の端部の機械加工により繋ぐことができ、従来必要とされる鋼管スリーブやグラウト材など鉄筋１１、１２とは別の部品や材料を不要とすることができる。また、この鉄筋の継手構造１では、凹部１１０と凸部１２１との間に接合ピン１３を通して脱落防止処置を採っているので、各鉄筋１１、１２の接合状態をより向上させることができる。 As described above, according to this embodiment, of the upper and lower (or left and right) reinforcing bars 11 and 12, the end of one reinforcing bar 11 is formed with a tapered recess 110 in the axial direction by machining. Then, a taper-shaped convex part 121 is formed in the end part of the other reinforcing bar 12 in the axial direction by machining, and the convex part 121 is fitted into the concave part 110 by cold fitting. Therefore, it is possible to connect the rebars 11 and 12 on one side and the other of the rebars 11 and 12 by machining the ends of the rebars 11 and 12, and the rebars 11 and 12 such as steel pipe sleeves and grout materials that are conventionally required. Can eliminate the need for separate parts and materials. Further, in this reinforcing bar joint structure 1, since the joint pin 13 is taken between the concave portion 110 and the convex portion 121 to prevent the dropping, the joint state of the reinforcing bars 11 and 12 can be further improved.

なお、この実施の形態では、一方の鉄筋１１の端部に機械加工により凹部１１０を形成し、他方の鉄筋１２の端部に機械加工により凸部１２１を形成し、凹部１１０に対して凸部１２１を冷やしばめにより嵌め込んで、各鉄筋１１、１２を接合したが、凹部と凸部を焼きばめ又は圧入により嵌め込むようにしてもよい。
（１）焼きばめの場合、一方の鉄筋において、接合側の端部の端面（中心）に凹部を他端部に向けて所定の深さに漸次小径のテーパ形状に切削加工し、他方の鉄筋においては、接合側の端部に凸部を接合側の端部から他端部に向けて所定の長さに漸次大径のテーパ形状（つまり、先細のテーパ形状）に切削加工する。このとき、凹部内の空間のテーパ形状と凸部のテーパ形状とをそれぞれ相似形の関係とし、凹部と凸部を外形が同じで異なる大きさに形成する。この場合、凹部に対して凸部を少し大きく形成する。そして、この凹部に対して凸部を焼きばめにより接合する。すなわち、凹部に所定の温度まで熱を加えてこの凹部を凸部が嵌合可能に所定の外径まで膨張させ、この拡径された凹部に凸部を嵌挿した後、この凹部を冷却により収縮させて結合する。このようにしても上記実施の形態と同様の作用効果を得ることができる。
（２）圧入の場合、一方の鉄筋において、接合側の端部の端面（中心）に凹部を他端部に向けて所定の深さに漸次小径のテーパ形状に切削加工し、他方の鉄筋においては、接合側の端部に凸部を接合側の端部から他端部に向けて所定の長さに漸次大径のテーパ形状（つまり、先細のテーパ形状）に切削加工する。このとき、凹部内の空間のテーパ形状と凸部のテーパ形状とをそれぞれ相似形の関係とし、凹部と凸部を外形が同じで異なる大きさに形成する。この場合、凹部に対して凸部を少し大きく形成する。そして、この凹部に対して凸部を圧入により接合する。すなわち、凹部と凸部を突き合わせ、凸部側に圧力を加えて、凹部内に凸部を圧入し結合する。このようにしても上記実施の形態と同様の作用効果を得ることができる。 In this embodiment, a concave portion 110 is formed by machining at the end of one reinforcing bar 11, and a convex portion 121 is formed by machining at the end of the other reinforcing bar 12. Although 121 is fitted by cold fitting and the reinforcing bars 11 and 12 are joined, the concave and convex portions may be fitted by shrink fitting or press fitting.
(1) In the case of shrink fitting, in one of the reinforcing bars, a concave portion is cut into a taper shape with a gradually smaller diameter to a predetermined depth toward the other end on the end surface (center) of the joining side, In a reinforcing bar, a convex portion is cut into a taper shape having a gradually larger diameter (that is, a tapered shape) at a predetermined length from the end portion on the joining side toward the other end portion at the joining side end portion. At this time, the tapered shape of the space in the concave portion and the tapered shape of the convex portion have a similar relationship, and the concave portion and the convex portion have the same outer shape and different sizes. In this case, the convex portion is formed slightly larger than the concave portion. And a convex part is joined to this recessed part by shrink fitting. That is, heat is applied to the concave portion to a predetermined temperature, the concave portion is expanded to a predetermined outer diameter so that the convex portion can be fitted, the convex portion is inserted into the expanded concave portion, and then the concave portion is cooled. Shrink and join. Even if it does in this way, the effect similar to the said embodiment can be acquired.
(2) In the case of press-fitting, in one reinforcing bar, a concave portion is cut into a tapered shape with a predetermined depth toward the other end on the end surface (center) of the joining side end, and the other reinforcing bar Cuts the convex portion at the end portion on the joining side into a taper shape having a gradually larger diameter (that is, a tapered shape) at a predetermined length from the end portion on the joining side toward the other end portion. At this time, the tapered shape of the space in the concave portion and the tapered shape of the convex portion have a similar relationship, and the concave portion and the convex portion have the same outer shape and different sizes. In this case, the convex portion is formed slightly larger than the concave portion. And a convex part is joined to this recessed part by press fit. That is, the concave portion and the convex portion are abutted, pressure is applied to the convex portion side, and the convex portion is press-fitted into the concave portion to be coupled. Even if it does in this way, the effect similar to the said embodiment can be acquired.

また、この実施の形態では、凹部１１０及び凸部１２１の周面に円筒形の穴１１２、１２２を設け、これらの穴１１２、１２２に円筒形の接合ピン１３を挿着したが、これらの穴をテーパ状に形成し、これらの穴にテーパ状の接合ピンを差し込むようにしてもよい。このようにしても上記実施の形態と同様の作用効果を得ることができる。 In this embodiment, cylindrical holes 112 and 122 are provided on the peripheral surfaces of the concave portion 110 and the convex portion 121, and the cylindrical joining pin 13 is inserted into the holes 112 and 122. May be formed in a tapered shape, and a tapered joining pin may be inserted into these holes. Even if it does in this way, the effect similar to the said embodiment can be acquired.

図２に第２の実施の形態を示している。図２に示すように、鉄筋の継手構造２は少なくとも上下（又は左右）２本の鉄筋２１、２２を備え、これらの鉄筋２１、２２が一方の鉄筋２１の端部に対し他方の鉄筋２２の端部が新たな継手形式により突き合わされて接合される。なお、この場合も、鉄筋２１、２２は異形鉄筋、又は丸鋼のいずれでもよく、いずれの鉄筋にもこの継手形式を適用することができる。 FIG. 2 shows a second embodiment. As shown in FIG. 2, the reinforcing bar joint structure 2 includes at least two upper and lower (or left and right) reinforcing bars 21 and 22, and these reinforcing bars 21 and 22 are connected to the end of one reinforcing bar 21 with respect to the other reinforcing bar 22. The ends are butted together and joined by a new joint type. In this case as well, the reinforcing bars 21 and 22 may be deformed reinforcing bars or round steel bars, and this joint type can be applied to any reinforcing bars.

この鉄筋の継手構造２では、一方の鉄筋２１の端部に機械加工により軸方向に向けて凹部２１０が形成され、他方の鉄筋２２の端部に機械加工により軸方向に向けて凸部２２１が形成され、これらの凹部２１０と凸部２２１がはめ合いによって接合される。この継手構造２の場合、一方の鉄筋２１において、接合側の端部の端面（中心）に凹部２１０が他端部に向けて所定の深さに円筒形形状又は角筒形形状に切削加工される。これに対して、他方の鉄筋２２においては、接合側の端部に凸部２２１が接合側の端部から他端部に向けて所定の長さの円筒形形状又は角筒形形状に切削加工される。このとき、凹部２１０内の空間の円筒形形状又は角筒形形状と凸部２２１の円筒形形状又は角筒形形状はそれぞれ相似形の関係になっていて、凹部２１０と凸部２２１は外形が同じで異なる大きさを有している。この場合、凹部２１０に対して凸部２２１が少し大きく形成される。そして、この凹部２１０に対して凸部２２１が冷やしばめにより接合される。この場合、図２中に示すように、凸部２２１が冷却媒体（この場合、Ｎ２（窒素）ガス）により所定の温度まで冷却されて凹部２１０内に嵌合可能に所定の外径まで収縮され、この縮径された凸部２２１が凹部２１０内に嵌め込まれる。そして、この凸部２２１が加熱により拡径されて凹部２１０に結合される。このようにしてこれらの鉄筋２１、２２はそれぞれ接合側端部を付き合わせて接合される。各鉄筋２１、２２の脱落（外れ）防止作用は、各鉄筋２１、２２の機械加工面、すなわち円筒形形状又は角筒形形状の凹部２１０と円筒形形状又は角筒形形状の凸部２２１の接触面の抵抗によりなされる。 In this reinforcing bar joint structure 2, a concave portion 210 is formed in the axial direction by machining at the end of one reinforcing bar 21, and a convex portion 221 is formed at the end of the other reinforcing bar 22 by axial machining. The concave portions 210 and the convex portions 221 are joined by fitting. In the case of this joint structure 2, in one of the reinforcing bars 21, a recess 210 is cut into a cylindrical shape or a rectangular tube shape at a predetermined depth toward the other end on the end surface (center) of the joining side end. The On the other hand, in the other reinforcing bar 22, the convex portion 221 at the end portion on the joining side is cut into a cylindrical shape or a rectangular tube shape having a predetermined length from the end portion on the joining side to the other end portion. Is done. At this time, the cylindrical shape or rectangular tube shape of the space in the concave portion 210 and the cylindrical shape or rectangular tube shape of the convex portion 221 are similar to each other, and the concave portion 210 and the convex portion 221 have an outer shape. They have the same and different sizes. In this case, the convex portion 221 is formed slightly larger than the concave portion 210. And the convex part 221 is joined to this concave part 210 by cold fitting. In this case, as shown in FIG. 2, the convex portion 221 is cooled to a predetermined temperature by a cooling medium (in this case, N 2 (nitrogen) gas) and contracted to a predetermined outer diameter so as to be able to fit into the concave portion 210. The convex portion 221 having a reduced diameter is fitted into the concave portion 210. The convex portion 221 is expanded in diameter by heating and coupled to the concave portion 210. In this way, the reinforcing bars 21 and 22 are joined with their joining side end portions attached together. The action of preventing the respective reinforcing bars 21 and 22 from falling off (disengagement) is that the machined surfaces of the reinforcing bars 21 and 22, that is, the cylindrical or rectangular tube-shaped concave portion 210 and the cylindrical or rectangular tube-shaped convex portion 221. This is done by the resistance of the contact surface.

また、この鉄筋の継手構造２においても、鉄筋２１、２２同士をより確実につなぎ合わせるために、第１の実施の形態と同様に、接合ピン１３を用いた脱落防止処置が採られている。なお、この接合ピン１３による接合形式は第１の実施の形態と同様で、既述のとおりである。 Further, in this reinforcing bar joint structure 2, in order to connect the reinforcing bars 21 and 22 more surely, the drop prevention treatment using the joining pin 13 is taken as in the first embodiment. In addition, the joining form by this joining pin 13 is the same as that of the first embodiment, and is as described above.

このようにしても第１の実施の形態と同様の作用効果を奏することができる。 Even if it does in this way, there can exist the same effect as 1st Embodiment.

なお、この実施の形態でも、一方の鉄筋２１の端部に機械加工により軸方向に向けて筒形形状の凹部２１０を形成し、他方の鉄筋２２の端部に機械加工により軸方向に向けて筒形形状の凸部２２１を形成し、凹部２１０に対して凸部２２１を冷やしばめにより嵌め込んで、各鉄筋２１、２２を接合したが、凹部２１０と凸部２２１を焼きばめ又は圧入により嵌め込むようにしてもよい。
（１）焼きばめの場合、一方の鉄筋において、接合側の端部の端面（中心）に凹部を他端部に向けて所定の深さの筒形形状に切削加工し、他方の鉄筋においては、接合側の端部に凸部を接合側の端部から他端部に向けて所定の長さの筒形形状に切削加工する。このとき、凹部内の空間の筒形形状と凸部の筒形形状とをそれぞれ相似形の関係とし、凹部と凸部を外形が同じで異なる大きさに形成する。この場合、凹部に対して凸部を少し大きく形成する。そして、この凹部に対して凸部を焼きばめにより接合する。すなわち、凹部に所定の温度まで熱を加えてこの凹部を凸部が嵌合可能に所定の外径まで膨張させ、この拡径された凹部に凸部を嵌挿した後、この凹部を冷却により収縮させて結合する。このようにしても上記実施の形態と同様の作用効果を得ることができる。
（２）圧入の場合、一方の鉄筋において、接合側の端部の端面（中心）に凹部を他端部に向けて所定の深さの筒形形状に切削加工し、他方の鉄筋においては、接合側の端部に凸部を接合側の端部から他端部に向けて所定の長さの筒形形状に切削加工する。このとき、凹部内の空間の筒形形状と凸部の筒形形状とをそれぞれ相似形の関係とし、凹部と凸部を外形が同じで異なる大きさに形成する。この場合、凹部に対して凸部を少し大きく形成する。そして、この凹部に対して凸部を圧入により接合する。すなわち、凹部と凸部を突き合わせ、凸部側に圧力を加えて、凹部内に凸部を圧入し結合する。このようにしても上記実施の形態と同様の作用効果を得ることができる。 Also in this embodiment, a cylindrical recess 210 is formed in the end portion of one of the reinforcing bars 21 in the axial direction by machining, and the end portion of the other reinforcing bar 22 is directed in the axial direction by machining. A cylindrical convex portion 221 is formed, and the convex portion 221 is fitted into the concave portion 210 by cold fitting to join the reinforcing bars 21 and 22, but the concave portion 210 and the convex portion 221 are shrink-fitted or press-fitted. May be fitted.
(1) In the case of shrink fitting, in one reinforcing bar, a recess is cut into a cylindrical shape with a predetermined depth toward the other end on the end surface (center) of the joining side end. Cuts the convex portion at the end portion on the joining side into a cylindrical shape having a predetermined length from the end portion on the joining side toward the other end portion. At this time, the cylindrical shape of the space in the concave portion and the cylindrical shape of the convex portion have a similar relationship, and the concave portion and the convex portion have the same outer shape and different sizes. In this case, the convex portion is formed slightly larger than the concave portion. And a convex part is joined to this recessed part by shrink fitting. That is, heat is applied to the concave portion to a predetermined temperature, the concave portion is expanded to a predetermined outer diameter so that the convex portion can be fitted, the convex portion is inserted into the expanded concave portion, and then the concave portion is cooled. Shrink and join. Even if it does in this way, the effect similar to the said embodiment can be acquired.
(2) In the case of press-fitting, in one rebar, the recess is cut into a cylindrical shape with a predetermined depth toward the other end on the end surface (center) of the end portion on the joining side. A convex portion is cut into a cylindrical shape having a predetermined length from the end portion on the joining side to the other end portion at the end portion on the joining side. At this time, the cylindrical shape of the space in the concave portion and the cylindrical shape of the convex portion have a similar relationship, and the concave portion and the convex portion have the same outer shape and different sizes. In this case, the convex portion is formed slightly larger than the concave portion. And a convex part is joined to this recessed part by press fit. That is, the concave portion and the convex portion are abutted, pressure is applied to the convex portion side, and the convex portion is press-fitted into the concave portion to be coupled. Even if it does in this way, the effect similar to the said embodiment can be acquired.

図３に第３の実施の形態を示している。図３に示すように、鉄筋の継手構造３は少なくとも上下（又は左右）２本の鉄筋３１、３２を備え、これらの鉄筋３１、３２が一方の鉄筋３１の端部に対し他方の鉄筋３２の端部が新たな継手形式により突き合わされて接合される。なお、この場合も、鉄筋３１、３２は異形鉄筋、又は丸鋼のいずれでもよく、いずれの鉄筋にもこの継手形式を適用することができる。 FIG. 3 shows a third embodiment. As shown in FIG. 3, the reinforcing bar joint structure 3 includes at least two upper and lower (or left and right) reinforcing bars 31 and 32, and these reinforcing bars 31 and 32 are connected to the end of one reinforcing bar 31 with respect to the other reinforcing bar 32. The ends are butted together and joined by a new joint type. In this case as well, the reinforcing bars 31 and 32 may be deformed reinforcing bars or round steel bars, and this joint type can be applied to any reinforcing bars.

この鉄筋の継手構造３では、一方の鉄筋３１の端部に機械加工により軸方向に向けて凹部３１０が形成され、当該凹部３１０の内周面にねじ３１１が切られ、他方の鉄筋３２の端部に機械加工により軸方向に向けて凸部３２１が形成され、当該凸部３２１の外周面にねじ３２２が切られ、これらの凹部３１０と凸部３２１が接着剤３３を介してねじ締結によって接合される。この継手構造３の場合、一方の鉄筋３１において、接合側の端部の端面（中心）に凹部３１０が他端部に向けて所定の深さの円筒形形状に形成され、当該凹部３１０の内周面にねじ（雌ねじ）３１１が切られる。これに対して、他方の鉄筋３２においては、接合側の端部に凸部３２１が接合側の端部から他端部に向けて所定の長さの円筒形形状に形成され、当該凸部３２１の外周面にねじ（雄ねじ）３２２が切られる。このようにして一方の鉄筋３１の凹部３１０に対して他方の鉄筋３２の凸部３２１が螺合可能になっている。そして、この凹部３１０のねじ３１１に接着剤３３が塗布されるとともに、凸部３２１のねじ３２２に焼き付き防止の処置（焼き付き防止用のシールテープ３４を巻くなど）が施され、凹部３１０に対して凸部３２１がねじ３１１、３２２を介して締め付けられて接合される。このようにしてこれらの鉄筋３１、３２はそれぞれ接合側端部を付き合わせて接合される。 In the reinforcing bar joint structure 3, a concave portion 310 is formed in the end portion of one reinforcing bar 31 in the axial direction by machining, a screw 311 is cut on the inner peripheral surface of the concave portion 310, and the end of the other reinforcing bar 32 is formed. A convex portion 321 is formed in the axial direction by machining, and a screw 322 is cut on the outer peripheral surface of the convex portion 321, and the concave portion 310 and the convex portion 321 are joined by screw fastening via the adhesive 33. Is done. In the case of this joint structure 3, in one of the reinforcing bars 31, a recess 310 is formed in a cylindrical shape with a predetermined depth toward the other end on the end surface (center) of the end on the joining side. A screw (internal thread) 311 is cut on the peripheral surface. On the other hand, in the other reinforcing bar 32, a convex portion 321 is formed in a cylindrical shape having a predetermined length from the end portion on the joining side to the other end portion at the end portion on the joining side. A screw (male screw) 322 is cut on the outer peripheral surface of the. In this way, the convex portion 321 of the other reinforcing bar 32 can be screwed into the concave portion 310 of one reinforcing bar 31. Then, the adhesive 33 is applied to the screw 311 of the concave portion 310, and the screw 322 of the convex portion 321 is treated to prevent seizure (such as wrapping a seal tape 34 for preventing seizure). The convex portion 321 is fastened and joined via screws 311 and 322. In this way, the reinforcing bars 31 and 32 are joined together with their joining side ends.

以上説明したように、この実施の形態によれば、上下（又は左右）の鉄筋３１、３２のうち、一方の鉄筋３１の端部に機械加工により軸方向に向けて凹部３１０及び（雌）ねじ３１１を形成し、他方の鉄筋３２の端部に機械加工により軸方向に向けて凸部３２１及び（雄）ねじ３２２を形成し、これらの凹部３１０と凸部３２１を接着剤３３を介してねじ締結により接合するので、つなぎ合わせる一方及び他方の各鉄筋３１、３２を各鉄筋３１、３２の端部の機械加工により繋ぐことができる。 As described above, according to this embodiment, of the upper and lower (or left and right) reinforcing bars 31 and 32, the recess 310 and the (female) screw are axially directed to the end of one reinforcing bar 31 by machining. 311 is formed, and a convex portion 321 and a (male) screw 322 are formed in the axial direction at the end of the other reinforcing bar 32 by machining, and the concave portion 310 and the convex portion 321 are screwed through the adhesive 33. Since it joins by fastening, each rebar 31 and 32 of the other to join can be connected by machining of the end of each rebar 31 and 32.

図４に第４の実施の形態を示している。図４に示すように、鉄筋の継手構造４は少なくとも上下（又は左右）２本の鉄筋４１、４２を備え、これらの鉄筋４１、４２が一方の鉄筋４１の端部に対し他方の鉄筋４２の端部が新たな継手形式により突き合わされて接合される。なお、この場合も、鉄筋４１、４２は異形鉄筋、又は丸鋼のいずれでもよく、いずれの鉄筋にもこの継手形式を適用することができる。 FIG. 4 shows a fourth embodiment. As shown in FIG. 4, the reinforcing bar joint structure 4 includes at least two upper and lower (or left and right) reinforcing bars 41 and 42, and these reinforcing bars 41 and 42 are connected to the end of one reinforcing bar 41 with respect to the other reinforcing bar 42. The ends are butted together and joined by a new joint type. In this case as well, the reinforcing bars 41 and 42 may be deformed reinforcing bars or round steel bars, and this joint type can be applied to any reinforcing bars.

この鉄筋の継手構造４では、一方の鉄筋４１の端部に機械加工により軸方向に向けて凹部４１０が形成され、当該凹部４１０の内周面にねじ４１１が切られ、他方の鉄筋４２の端部に機械加工により軸方向に向けて凸部４２１が形成され、当該凸部４２１の外周面にねじ４２２が切られ、これらの凹部４１０と凸部４２１が接着剤４３を介してねじ締結によって接合される。この継手構造４の場合、一方の鉄筋４１においては、第３の実施の形態と同様に、接合側の端部の端面（中心）に凹部４１０が他端部に向けて所定の深さの円筒形形状に形成され、当該凹部４１０の内周面にねじ（雌ねじ）４１１が切られる。これに対して、他方の鉄筋４２においては、第３の実施の形態と異なり、他方の鉄筋４２の端部に形成される凸部４２１及びねじ４２２は、端部に機械加工により軸方向に向けてねじ穴４２３が形成され、このねじ穴４２３に接合ねじ（ねじ棒）４２４が締結されてなる。なお、この接合ねじ４２４には、母材強度よりも高い降伏点の材料が使用される。そして、このねじ穴４２３のねじ部に接着剤４３が塗布されるとともに、接合ねじ４２４のねじ部に焼き付き防止の処置（焼き付き防止用のシールテープ４４を巻くなど）が施され、ねじ穴４２３に対して接合ねじ４２４がねじを介して締め付けられて固着される。このようにして一方の鉄筋４１の凹部４１０に対して他方の鉄筋４２の凸部４２１が螺合可能になっている。そして、第３の実施の形態と同様に、凹部４１０のねじ４１１に接着剤４３が塗布されるとともに、凸部４２１のねじ４２２に焼き付き防止の処置（焼き付き防止用のシールテープ４４を巻くなど）が施され、凹部４１０に対して凸部４２１がねじ４１１、４２２を介して締め付けられて接合される。このようにしてこれらの鉄筋４１、４２はそれぞれ接合側端部を付き合わせて接合される。 In this reinforcing bar joint structure 4, a recess 410 is formed in the end of one reinforcing bar 41 in the axial direction by machining, a screw 411 is cut on the inner peripheral surface of the recess 410, and the end of the other reinforcing bar 42 is formed. A convex portion 421 is formed in the axial direction by machining, a screw 422 is cut on the outer peripheral surface of the convex portion 421, and the concave portion 410 and the convex portion 421 are joined by screw fastening via the adhesive 43. Is done. In the case of this joint structure 4, in one reinforcing bar 41, as in the third embodiment, a concave portion 410 is formed on the end surface (center) of the end portion on the joining side with a predetermined depth toward the other end portion. A screw (internal thread) 411 is cut on the inner peripheral surface of the recess 410. On the other hand, in the other rebar 42, unlike the third embodiment, the convex portion 421 and the screw 422 formed at the end of the other rebar 42 are directed to the end in the axial direction by machining. Then, a screw hole 423 is formed, and a joining screw (screw rod) 424 is fastened to the screw hole 423. Note that a material having a yield point higher than the strength of the base material is used for the joining screw 424. Then, the adhesive 43 is applied to the threaded portion of the screw hole 423, and a treatment for preventing seizure (such as winding a seal tape 44 for preventing seizure) is applied to the threaded portion of the joining screw 424. On the other hand, the joining screw 424 is fastened and fixed through the screw. In this way, the convex portion 421 of the other reinforcing bar 42 can be screwed into the concave portion 410 of one reinforcing bar 41. Then, as in the third embodiment, the adhesive 43 is applied to the screw 411 of the concave portion 410, and an anti-seize treatment (such as winding a seal tape 44 for preventing seizure) around the screw 422 of the convex portion 421. The convex portion 421 is fastened and joined to the concave portion 410 via the screws 411 and 422. In this way, the reinforcing bars 41 and 42 are joined with their joining side end portions attached together.

このようにしても第３の実施の形態と同様の作用効果を奏することができる。 Even if it does in this way, there can exist the same effect as 3rd Embodiment.

１鉄筋の継手構造
１１鉄筋
１１０凹部
１１２穴
１２鉄筋
１２１凸部
１２２穴
１３接合ピン
２鉄筋の継手構造
２１鉄筋
２１０凹部
２２鉄筋
２２１凸部
３鉄筋の継手構造
３１鉄筋
３１０凹部
３１１ねじ
３２鉄筋
３２１凸部
３２２ねじ
３３接着剤
３４焼き付き防止用のシールテープ（焼き付き防止の処置）
４鉄筋の継手構造
４１鉄筋
４１０凹部
４１１ねじ
４２鉄筋
４２１凸部
４２２ねじ
４２３ねじ穴
４２４接合ねじ（ねじ棒）
４３接着剤
４４焼き付き防止用のシールテープ（焼き付き防止用のシール材） DESCRIPTION OF SYMBOLS 1 Reinforcing bar joint structure 11 Reinforcing bar 110 Recessed part 112 Hole 12 Reinforcing bar 121 Convex part 122 Hole 13 Joint pin 2 Reinforcing bar joint structure 21 Reinforcing bar 210 Concave part 22 Reinforcing bar 221 Convex part 3 Reinforcing bar joint structure 31 Reinforcing bar 310 Concave part 311 Screw 32 Reinforcing bar 32 Part 322 Screw 33 Adhesive 34 Sealing tape for preventing seizure (Measures for preventing seizure)
4 Reinforcing bar joint structure 41 Reinforcing bar 410 Recessed part 411 Screw 42 Reinforcing bar 421 Convex part 422 Screw 423 Screw hole 424 Joining screw (screw rod)
43 Adhesive 44 Sealing tape for preventing seizure (sealant for preventing seizure)

Claims

In the joint structure of the reinforcing bar where the end of the other reinforcing bar is butted against the end of the reinforcing bar,
A recess is formed in the axial direction by machining at the end of the one reinforcing bar,
A convex portion is formed in the axial direction by machining at the end of the other reinforcing bar,
The convex portions are fitted into the concave portions by cold fitting or shrink fitting or press fitting, and the reinforcing bars are joined.
Reinforcing bar joint structure.

2. The reinforcing bar joint structure according to claim 1, wherein the concave portion of one reinforcing bar is formed in a substantially tapered shape or a substantially cylindrical shape, and the protruding portion of the other reinforcing bar is formed in a substantially tapered shape or a substantially cylindrical shape.

Holes that can communicate with each other in the direction perpendicular to the axial direction are formed in the concave portion of one reinforcing bar and the convex portion of the other reinforcing bar, and the concave portion and the convex portion are fitted in the concave portion. The joint structure of a reinforcing bar according to claim 1 or 2, wherein a joining pin is inserted between the holes of the convex portion.

In the joint structure of the reinforcing bar where the end of the other reinforcing bar is butted against the end of the reinforcing bar,
A recess is formed in the axial direction by machining at the end of the one reinforcing bar, and a screw is cut on the inner peripheral surface of the recess,
A convex part is formed toward the axial direction by machining at the end of the other reinforcing bar, and the outer peripheral surface of the convex part is threaded,
The protrusions are tightened by screw fastening via an adhesive with respect to the recesses, and the rebars are joined.
Reinforcing bar joint structure.

The convex portion and the screw formed at the end of the other reinforcing bar include a screw hole formed in the end portion in the axial direction by machining and a joining screw fastened to the screw hole. The joint structure of a reinforcing bar according to claim 4, wherein the joining screw is fixed to the hole by screw fastening through an adhesive.