JP7227801B2 - REINFORCED JOINT STRUCTURE, BUILDING USING THE SAME, AND CONSTRUCTION METHOD OF REINFORCED JOINT STRUCTURE - Google Patents

REINFORCED JOINT STRUCTURE, BUILDING USING THE SAME, AND CONSTRUCTION METHOD OF REINFORCED JOINT STRUCTURE Download PDF

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JP7227801B2
JP7227801B2 JP2019046944A JP2019046944A JP7227801B2 JP 7227801 B2 JP7227801 B2 JP 7227801B2 JP 2019046944 A JP2019046944 A JP 2019046944A JP 2019046944 A JP2019046944 A JP 2019046944A JP 7227801 B2 JP7227801 B2 JP 7227801B2
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reinforcing bar
rebar
mechanical joint
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joint
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稔 小田
裕介 山谷
秀和 平野
潤治 佐古
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Sumitomo Mitsui Construction Co Ltd
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Description

本発明は、鉄筋継手構造とこれを用いた建物、及び鉄筋継手構造の施工方法に関する。 TECHNICAL FIELD The present invention relates to a reinforcing bar joint structure, a building using the same, and a construction method for the reinforcing bar joint structure.

鉄筋コンクリート造の建物においては、鉄筋と鉄筋を接続する継手が用いられることがある。特許文献１には機械的継手を用いた柱と梁の接続構造が開示されている。機械式継手はスリーブ状の金物である。接続される２本の鉄筋は継手の両側の開口からそれぞれ継手の貫通孔に挿入され、モルタル注入、ねじ、圧着などの方法によって継手に固定される。 In reinforced concrete buildings, joints are sometimes used to connect reinforcing bars. Patent Literature 1 discloses a structure for connecting columns and beams using mechanical joints. A mechanical joint is a sleeve-like piece of hardware. Two rebars to be connected are inserted into through-holes of the joint through openings on both sides of the joint, and fixed to the joint by a method such as mortar injection, screwing, or crimping.

一般に機械式継手の外径は鉄筋の外径の２倍程度であるため、通常、機械式継手は配置スペースの確保しやすいところに設置される。例えば、柱と梁の接続部に隣接する領域は鉄筋の配置密度が高いため、機械式継手は配置されないことが多い。しかし、機械式継手は通常一箇所に集中配置されるため、鉄筋同士の間隔は機械式継手の外径で決定されることが多い。このため、鉄筋の配置スペースに余裕があっても、鉄筋の配置間隔が機械式継手によって制約され、必要な量の鉄筋を配置できない可能性がある。 Since the outer diameter of a mechanical joint is generally about twice the outer diameter of a reinforcing bar, the mechanical joint is usually installed in a place where it is easy to secure an arrangement space. For example, mechanical joints are often not placed in areas adjacent to column-to-beam connections because of the high density of reinforcing bars. However, since mechanical joints are usually concentrated in one place, the spacing between reinforcing bars is often determined by the outer diameter of the mechanical joint. Therefore, even if there is enough space for arranging the reinforcing bars, there is a possibility that the required amount of reinforcing bars cannot be arranged because the intervals for arranging the reinforcing bars are restricted by the mechanical joints.

鉄筋の配置間隔の制約を緩和するためには、機械式継手を薄肉化することが有効である。このため、機械式継手に熱処理を行い、機械式継手の強度を増加させることが行われている。これによって、機械式継手が薄肉化され、鉄筋をより高密度で配置することができる。 Reducing the thickness of mechanical joints is an effective way to relax the restrictions on the spacing of reinforcing bars. For this reason, heat treatment is performed on the mechanical joint to increase the strength of the mechanical joint. This allows the mechanical joint to be thinner and the rebars to be placed at a higher density.

特開２０１５－２０９６３４号公報JP 2015-209634 A

しかしながら、機械式継手の熱処理はコストがかかり、建物の建設コストの増加の一因となっている。一方、熱処理を行わないと機械式継手の薄肉化が困難となり、必要な量の鉄筋を配置するために柱や梁のサイズアップが必要となることがある。 However, heat treatment of mechanical joints is costly and contributes to increased building construction costs. On the other hand, without heat treatment, it is difficult to reduce the thickness of mechanical joints, and it may be necessary to increase the size of columns and beams in order to arrange the required amount of reinforcing bars.

本発明は必要な量の鉄筋を配置することが容易で、且つコストの増加を抑えることが可能な鉄筋継手構造を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a reinforcing bar joint structure in which the required amount of reinforcing bars can be easily arranged and an increase in cost can be suppressed.

本発明は、柱と、柱に接続された梁と、を有し、梁は、柱との接続部に隣接する非ヒンジ領域と、非ヒンジ領域の、接続部の反対側の端部に隣接するヒンジ領域と、を有する建物に使用される鉄筋継手構造に関する。鉄筋継手構造は、第１の鉄筋と、第２の鉄筋と、第１の鉄筋と第２の鉄筋とを接続する熱処理されていない機械式継手と、を有し、機械式継手は非ヒンジ領域に設けられている。第１の鉄筋と第２の鉄筋の機械式継手が接続される端部領域における降伏点が５００Ｎ／ｍｍ2以上であり、第１の鉄筋と第２の鉄筋の外径に対する機械式継手の厚さの比が０．２５～０．３６である。 The invention comprises a post and a beam connected to the post, the beam adjoining a non-hinged region adjacent the connection to the post and an end of the non-hinged region opposite the connection. A rebar joint structure for use in a building having a hinge region that The rebar joint structure has a first rebar, a second rebar, and a non-heat treated mechanical joint connecting the first rebar and the second rebar , the mechanical joint in a non-hinged region. is provided in The yield point in the end region where the mechanical joint of the first reinforcing bar and the second reinforcing bar is connected is 500 N / mm 2 or more, and the thickness of the mechanical joint with respect to the outer diameter of the first reinforcing bar and the second reinforcing bar The height ratio is 0.25-0.36.

本発明によれば、第１の鉄筋と第２の鉄筋はいわゆる高強度鉄筋を用いているため、鉄筋の外径を抑え、それによって機械式継手の必要内径を減少させることができる。機械式継手は熱処理されていないため、熱処理された機械式継手と比べて材料強度は低下するが、機械式継手の必要内径が減少するため、厚さを増加しても外径を大きく増加させることなく、必要な断面積を確保することができる。また、機械式継手の重量は増加するが、熱処理が不要であるため、機械式継手のコストは全体として抑えられる。 According to the present invention, since the first reinforcing bar and the second reinforcing bar use so-called high-strength reinforcing bars, the outer diameter of the reinforcing bars can be reduced, thereby reducing the required inner diameter of the mechanical joint. Because mechanical joints are not heat treated, the material strength is reduced compared to heat treated mechanical joints, but the required inner diameter of the mechanical joint is reduced, resulting in a large increase in outer diameter even when the thickness is increased. The required cross-sectional area can be secured without Also, although the weight of the mechanical joint is increased, the overall cost of the mechanical joint is reduced because no heat treatment is required.

よって、本発明によれば、必要な量の鉄筋を配置することが容易で、且つコストの増加を抑えることの可能が鉄筋継手構造を提供することができる。 Therefore, according to the present invention, it is possible to provide a reinforcing bar joint structure in which it is easy to arrange the required amount of reinforcing bars and the increase in cost can be suppressed.

鉄筋継手構造を示す、建物の部分側面図である。1 is a partial side view of a building showing a rebar joint structure; FIG. 図1のＡ－Ａ線からみた柱と梁の水平断面図である。FIG. 2 is a horizontal cross-sectional view of a pillar and a beam viewed from line AA in FIG. 1; 機械式継手と第１及び第２の鉄筋の端部の詳細断面図である。Fig. 3 is a detailed cross-sectional view of the mechanical joint and the ends of the first and second rebars; 実施形態と比較例における機械式継手と鉄筋の断面図である。FIG. 4 is a cross-sectional view of a mechanical joint and reinforcing bars in an embodiment and a comparative example;

以下、図面を参照して本発明の実施形態について説明する。図１は、鉄筋継手構造２を示す、建物１の部分側面図である。図２は、図1のＡ－Ａ線からみた柱３と梁４の水平断面図である。本実施形態の建物１はプレキャスト（ＰＣａ）構造であるが、本発明は現場打ちの鉄筋コンクリート構造にも適用可能である。建物１は柱３と梁４を有し、柱３と梁４はそれぞれ内部に鉄筋２１を備えている。鉄筋２１の周囲にはコンクリート２２が設けられている。梁４の主筋は梁４の上部と下部にそれぞれ設けられ、機械式継手７によって隣接する主筋に接続されている。本明細書では、機械式継手７によって接続される２本の主筋を第１の鉄筋５及び第２の鉄筋６と呼び、柱３と梁４が交差する直方体状の領域を交差部８と呼ぶ。第１の鉄筋５は機械式継手７の、交差部８と反対側に設けられた鉄筋であり、第２の鉄筋６は交差部８を通る鉄筋である。柱３の鉄筋２１（主筋）は柱３の外周部に沿って、梁４の主筋と干渉しないように設けられている。梁４の鉄筋２１も機械式継手７によって隣接する鉄筋２１と接続されている。機械式継手７は交差部８の外側に配置されている。第１の鉄筋５と第２の鉄筋６は同一の直径（呼び径または公称直径）を有している。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial side view of a building 1 showing a rebar joint structure 2. FIG. FIG. 2 is a horizontal sectional view of the column 3 and the beam 4 as seen from line AA in FIG. Although the building 1 in this embodiment is a precast (PCa) structure, the invention is also applicable to cast-in-place reinforced concrete structures. A building 1 has a pillar 3 and a beam 4, and each of the pillar 3 and the beam 4 has a reinforcing bar 21 inside. Concrete 22 is provided around the reinforcing bars 21 . The main reinforcing bars of the beam 4 are provided on the upper and lower parts of the beam 4, respectively, and are connected to adjacent main reinforcing bars by mechanical joints 7. As shown in FIG. In this specification, the two main bars connected by the mechanical joint 7 are called the first reinforcing bar 5 and the second reinforcing bar 6, and the rectangular parallelepiped area where the column 3 and the beam 4 intersect is called the intersection 8. . The first reinforcing bar 5 is a reinforcing bar provided on the opposite side of the intersection 8 of the mechanical joint 7 , and the second reinforcing bar 6 is a reinforcing bar passing through the intersection 8 . The reinforcing bars 21 (main bars) of the columns 3 are provided along the outer periphery of the columns 3 so as not to interfere with the main bars of the beams 4 . Reinforcing bars 21 of beams 4 are also connected to adjacent reinforcing bars 21 by mechanical joints 7 . The mechanical joint 7 is arranged outside the intersection 8 . The first rebar 5 and the second rebar 6 have the same diameter (nominal or nominal diameter).

梁４は、終局耐力に達した際に塑性ヒンジが形成されるように設計されている。塑性ヒンジは梁４の全断面で鉄筋の塑性変形が生じた状態のことである。以下の説明では、塑性ヒンジが生じる領域をヒンジ領域９、塑性ヒンジが生じない領域を非ヒンジ領域１０という。梁４の曲げ応力は通常柱３と梁４の接合部１１で最大となり、接合部１１から離れに従い減少するため、一般にヒンジ領域９は柱３と梁４の接合部１１に生じる。しかし、本実施形態のように接合部１１の近傍を非ヒンジ領域１０とし、ヒンジ領域９を柱３と梁４の接合部１１から離れた位置に形成することで、鉄筋の合理化が可能となる場合がある。すなわち、ヒンジ領域９を梁４の中央側に移す（ヒンジリロケーション）ことで鉄筋の設計応力度が下がるため、鉄筋の径や本数を低減することが可能となる。 The beam 4 is designed such that a plastic hinge is formed when the ultimate strength is reached. A plastic hinge is a state in which plastic deformation of reinforcing bars occurs in the entire cross section of the beam 4 . In the following description, a region where a plastic hinge occurs is called a hinge region 9 and a region where a plastic hinge does not occur is called a non-hinge region 10 . The bending stress of the beam 4 is usually maximum at the junction 11 between the column 3 and the beam 4 and decreases as the distance from the junction 11 increases. However, by forming the vicinity of the joint 11 as the non-hinged region 10 and forming the hinge region 9 at a position away from the joint 11 of the column 3 and the beam 4 as in the present embodiment, rationalization of reinforcing bars becomes possible. Sometimes. That is, by moving the hinge region 9 to the center side of the beam 4 (hinge relocation), the designed stress degree of the reinforcing bars is lowered, so it is possible to reduce the diameter and number of the reinforcing bars.

本実施形態では、ヒンジリロケーションを行うため、第１の鉄筋５として、特定の部分の降伏点が高められた部分高強度鉄筋を採用している。このような部分高強度鉄筋は、例えば強度を高めたい部分を熱処理することによって得られる。第１の鉄筋５の降伏点は柱３と梁４の接合部１１に隣接する端部領域１２で高くされ（一例として７００Ｎ／ｍｍ2）、それ以外の領域で小さくされている（一例として４９０Ｎ／ｍｍ2）。このため、接合部１１に隣接する端部領域１２では第１の鉄筋５の強度が増し、非ヒンジ領域１０が形成され、ヒンジ領域９が端部領域１２に隣接する梁４の中央側に移動する。つまり、本実施形態では、非ヒンジ領域１０が柱３との接合部１１に隣接し、ヒンジ領域９が非ヒンジ領域１０の、接合部１１の反対側の端部に隣接するように形成されている。ヒンジリロケーションの方法は上記の方法に限定されず、例えば部分的に鉄筋の本数を増やす方法によってもよい。 In this embodiment, in order to perform hinge relocation, as the first reinforcing bar 5, a partial high-strength reinforcing bar in which the yield point of a specific portion is increased is adopted. Such partially high-strength reinforcing bars can be obtained, for example, by heat-treating a portion whose strength is desired to be increased. The yield point of the first reinforcing bar 5 is high (eg 700 N/mm 2 ) in the end region 12 adjacent to the joint 11 of the column 3 and the beam 4 and is decreased (eg 490 N/mm 2 ) in other regions. /mm 2 ). Therefore, in the end region 12 adjacent to the joint 11, the strength of the first reinforcing bar 5 is increased, the non-hinged region 10 is formed, and the hinge region 9 moves toward the center of the beam 4 adjacent to the end region 12. do. That is, in the present embodiment, the non-hinged region 10 is adjacent to the joint 11 with the column 3, and the hinge region 9 is formed adjacent to the end of the non-hinge region 10 opposite to the joint 11. there is The method of hinge relocation is not limited to the above method, and for example, a method of partially increasing the number of reinforcing bars may be used.

機械式継手７は大きな塑性変形が発生する可能性のあるヒンジ領域９を避けて配置するのが好ましい。このため、機械式継手７は非ヒンジ領域１０に設けられ、本実施形態では柱３と梁４との接合部１１に隣接して設けられている。機械式継手７を非ヒンジ領域１０に設置することで、非ヒンジ領域１０の剛性を増加することもできる。また、本実施形態では機械式継手７の熱処理を行っていない。熱処理されているか否かは金属組織を観察することによって容易に識別することができる。熱処理されていない機械式継手７の引張強さは概ね３００Ｎ／ｍｍ2以上、８００Ｎ／ｍｍ2以下である。 The mechanical joint 7 is preferably arranged avoiding the hinge region 9 where large plastic deformation may occur. For this reason, the mechanical joint 7 is provided in the non-hinge region 10, and is provided adjacent to the joint 11 between the column 3 and the beam 4 in this embodiment. Placing the mechanical joint 7 in the non-hinged region 10 can also increase the stiffness of the non-hinged region 10 . Further, in this embodiment, the mechanical joint 7 is not heat-treated. Whether or not the steel has been heat-treated can be easily identified by observing the metallographic structure. The tensile strength of the non-heat-treated mechanical joint 7 is approximately 300 N/mm 2 or more and 800 N/mm 2 or less.

図３は、機械式継手７と第１及び第２の鉄筋６の端部をより詳細に示す、図２のＢ部詳細断面図である。機械式継手７は鋳鉄で形成されたスリーブ状の金物であり、第１の鉄筋５と第２の鉄筋６が挿入される貫通孔１３を有している。第１の鉄筋５と第２の鉄筋６は異形鉄筋である。第１の鉄筋５と第２の鉄筋６は貫通孔１３の両側の開口から挿入され、貫通孔１３の内壁と第１及び第２の鉄筋６との間の隙間がグラウト１４で充填される。梁４には同じ径及び長さの主筋が規則的に多数配置されるため、多数の機械式継手７は接合部１１から同じ距離に配置され、且つ機械式継手７は互いに隣接して配置される。機械式継手７の間隔Ｓは施工性を考慮して設定される。 FIG. 3 is a detailed cross-sectional view of part B of FIG. 2 showing the mechanical joint 7 and the ends of the first and second reinforcing bars 6 in more detail. The mechanical joint 7 is a sleeve-shaped hardware made of cast iron, and has a through hole 13 into which the first reinforcing bar 5 and the second reinforcing bar 6 are inserted. The first reinforcing bar 5 and the second reinforcing bar 6 are deformed bars. The first reinforcing bar 5 and the second reinforcing bar 6 are inserted from openings on both sides of the through hole 13 , and the gap between the inner wall of the through hole 13 and the first and second reinforcing bars 6 is filled with the grout 14 . Since a large number of main reinforcing bars having the same diameter and length are regularly arranged on the beam 4, a large number of mechanical joints 7 are arranged at the same distance from the joint 11, and the mechanical joints 7 are arranged adjacent to each other. be. The interval S between the mechanical joints 7 is set in consideration of workability.

図４は、図３のＣ－Ｃ線に沿った第１の鉄筋５及び機械式継手７の断面図と、主要寸法を、実施例及び比較例１，２について示している。比較例１では呼び径Ｄ３８の普通鉄筋（ＳＤ４９０）を使用しており、機械式継手７は熱処理されている。比較例１はこれまでの一般的な設計思想に基づくものであり、鉄筋継手の間隔Ｓの増加を抑えるために機械式継手７を熱処理して、機械式継手７の厚さを抑えている。これに対して、比較例２は、比較例１において機械式継手７の熱処理を省略した場合を示している。熱処理はコストが掛かるため、熱処理を省略することによってコストの低減が可能となる。しかし、非ヒンジ領域１０を柱３と梁４の接合部１１の隣接領域１２に形成するためには、機械式継手７の強度が必要となる。熱処理を省略すると継手の強度が低下し、非ヒンジ領域１０を隣接領域１２に形成できない可能性がある。このため、比較例２では、比較例１の機械式継手７と同等の強度を確保するために、機械式継手７の厚さを増加している。この結果、機械式継手７の外径が増加し、配置可能な鉄筋本数が減少する可能性が生じる。 FIG. 4 shows a cross-sectional view of the first reinforcing bar 5 and the mechanical joint 7 along line CC in FIG. In Comparative Example 1, ordinary reinforcing bars (SD490) with a nominal diameter of D38 are used, and the mechanical joint 7 is heat-treated. Comparative Example 1 is based on the general design concept so far, and heat-treats the mechanical joint 7 to suppress the thickness of the mechanical joint 7 in order to suppress the increase in the interval S between the reinforcing bar joints. On the other hand, Comparative Example 2 shows a case where the heat treatment of the mechanical joint 7 in Comparative Example 1 is omitted. Since heat treatment is costly, the cost can be reduced by omitting the heat treatment. However, in order to form the non-hinged region 10 in the adjacent region 12 of the junction 11 between the column 3 and the beam 4, the strength of the mechanical joint 7 is required. If the heat treatment is omitted, the strength of the joint will decrease, and there is a possibility that the non-hinge region 10 cannot be formed in the adjacent region 12 . Therefore, in Comparative Example 2, the thickness of the mechanical joint 7 is increased in order to ensure strength equivalent to that of the mechanical joint 7 of Comparative Example 1. As a result, the outer diameter of the mechanical joint 7 increases, possibly reducing the number of rebars that can be arranged.

実施例ではこれまでの設計思想とは異なり、機械式継手７の熱処理を行っていないため、機械式継手７の厚さが比較例１より増加している。単純に機械式継手７の厚さを増加すると、比較例２に示すように機械式継手７の外径が増えてしまうが、実施例では非ヒンジ領域１０で第１の鉄筋５の降伏点を高めているため（ＳＤ７００）、鉄筋径を呼び径Ｄ３２まで低減することが可能である。このため、鉄筋径が減少した分、機械式継手７の配置領域を内側に広げることができ（φ２を小さくすることができ）、これによって、機械式継手７の外径を減少することができる。また、機械式継手７の外径を減少することができない場合でも、機械式継手７の外径の増加は、配置領域を内側に広げるだけでは不足する分を補う程度で十分となるため、機械式継手７の外径の増加を抑制することができる。 Unlike the conventional design concept, the thickness of the mechanical joint 7 is larger than that of the comparative example 1 because the mechanical joint 7 is not heat-treated in the example. Simply increasing the thickness of the mechanical joint 7 increases the outer diameter of the mechanical joint 7 as shown in Comparative Example 2. Since it is increased (SD700), it is possible to reduce the diameter of the reinforcing bar to the nominal diameter of D32. Therefore, the area where the mechanical joint 7 is arranged can be expanded inward by the amount corresponding to the reduction in the diameter of the reinforcing bar (φ2 can be reduced), thereby reducing the outer diameter of the mechanical joint 7. . In addition, even if the outer diameter of the mechanical joint 7 cannot be reduced, the increase in the outer diameter of the mechanical joint 7 is sufficient to compensate for the shortage by expanding the arrangement area inward. An increase in the outer diameter of the joint 7 can be suppressed.

以上から分かるように、本実施形態では、機械式継手７の厚さｔ１に対する鉄筋の外径φ１の比φ１／ｔ１が、比較例１，２よりも小さくされている。鉄筋の外径φ１は呼び径であるが、呼び径と公称直径（節間における直径）との間に大きな違いはないため、鉄筋の外径φ１を公称直径としても大差はない。なお、機械式継手７に広口径側と狭口径側がある場合、機械式継手７の内径及び厚さは広口径側で定義する。 As can be seen from the above, in the present embodiment, the ratio φ1/t1 of the outer diameter φ1 of the reinforcing bar to the thickness t1 of the mechanical joint 7 is made smaller than in the first and second comparative examples. The outer diameter φ1 of the reinforcing bar is the nominal diameter, but since there is not much difference between the nominal diameter and the nominal diameter (diameter between nodes), there is not much difference even if the outer diameter φ1 of the reinforcing bar is used as the nominal diameter. If the mechanical joint 7 has a wide diameter side and a narrow diameter side, the inner diameter and thickness of the mechanical joint 7 are defined by the wide diameter side.

実施例では部分高強度鉄筋を採用しているため、鉄筋の単位重量コストは比較例１，２よりも高くなるが、鉄筋の単位長さ当たり重量が減少するため、鉄筋コストとしては比較例１，２と同等である。また、機械式継手７のコストに関しては、厚さの増加により材料コストは増加するものの、熱処理が不要となるため、トータルのコストは低減する。よって、鉄筋と機械式継手７とを合わせたコストは低減する。 Since the example employs partially high-strength reinforcing bars, the unit weight cost of the reinforcing bars is higher than that of Comparative Examples 1 and 2. , 2. As for the cost of the mechanical joint 7, although the material cost increases due to the increase in thickness, the total cost is reduced because heat treatment is not required. Therefore, the combined cost of the reinforcing bars and the mechanical joint 7 is reduced.

さらに、径の小さい鉄筋を用いることにより鉄筋１本当たりの重量が減少するため、施工コストの低減も可能となる。機械式継手７については、厚さを増加することによる重量増加は生じるものの、鉄筋と比べて物量が少ないため、施工性への影響は小さい。 Furthermore, by using reinforcing bars with a small diameter, the weight of each reinforcing bar is reduced, so that construction costs can be reduced. As for the mechanical joint 7, although the weight is increased by increasing the thickness, the workability is less affected because the amount of the mechanical joint 7 is smaller than that of the reinforcing bar.

機械式継手７の断面積が増加するため、軸剛性、曲げ剛性、せん断剛性などの継手剛性が増加する。端部領域１２の剛性が増加し、変形が抑制されるため、非ヒンジ領域１０が端部領域１２により確実に形成される。 Since the cross-sectional area of the mechanical joint 7 increases, joint stiffness such as axial stiffness, bending stiffness, and shear stiffness increases. Since the rigidity of the end region 12 is increased and deformation is suppressed, the non-hinge region 10 is reliably formed by the end region 12 .

図１，２に示すように、柱３と梁４の接合部１１の隣接領域１２である非ヒンジ領域１０及び非ヒンジ領域１０に隣接するヒンジ領域９にはせん断補強筋１５が設けられている。上述の通り比較例１と比べて主筋の鉄筋径が減少しているため、かぶり厚さに余裕が生じる。このため、せん断補強筋１５の配置スペースの確保が容易であり、非ヒンジ領域１０のせん断補強筋１５の径をヒンジ領域９のせん断補強筋１５の径より大きくすることも可能である。 As shown in FIGS. 1 and 2, shear reinforcing bars 15 are provided in the non-hinged region 10, which is the adjacent region 12 of the joint 11 between the column 3 and the beam 4, and the hinged region 9 adjacent to the non-hinged region 10. . Since the reinforcing bar diameter of the main bar is smaller than that of Comparative Example 1 as described above, there is a margin in the cover thickness. Therefore, it is easy to secure a space for arranging the shear reinforcing bars 15 , and it is possible to make the diameter of the shear reinforcing bars 15 in the non-hinge area 10 larger than the diameter of the shear reinforcing bars 15 in the hinge area 9 .

なお、柱３に対しても、梁４について説明した鉄筋継手構造２を適用できることはいうまでもない。柱３についても、高強度鉄筋を採用することで、従来と同程度の曲げ強度を確保することができる。柱３においては通常ヒンジ領域を想定しないが、本実施形態においても従来と同等以上の曲げ強度を確保できることから、ヒンジ領域は想定しない。従って、柱３における機械式継手７の設置位置は特に制約されない。 Needless to say, the reinforcing bar joint structure 2 described for the beam 4 can also be applied to the column 3 . By using high-strength reinforcing bars for the columns 3 as well, it is possible to ensure the same level of bending strength as before. A hinge region is not normally assumed in the pillar 3, but a hinge region is not assumed in this embodiment because it is possible to secure bending strength equal to or greater than that of the conventional one. Therefore, the installation position of the mechanical joint 7 on the pillar 3 is not particularly restricted.

以上、本発明を一実施形態と実施例により説明した。部分高強度鉄筋における高強度部の降伏点は実施形態では７００Ｎ／ｍｍ2であるが、より一般的には、第１の鉄筋５と第２の鉄筋６の機械式継手７で固定される端部領域１２の降伏点は５００Ｎ／ｍｍ2以上であればよい。また、機械式継手７の厚さｔ１に対する第１の鉄筋５と第２の鉄筋６の外径φ１の比φ１／ｔ１は実施形態では０．３０であるが、０．２５～０．３７、より好ましくは０．２８～０．３４とすることができる。 The present invention has been described above with an embodiment and an example. The yield point of the high-strength portion of the partial high-strength reinforcing bar is 700 N/mm 2 in the embodiment, but more generally The yield point of the partial region 12 should be 500 N/mm 2 or more. Further, the ratio φ1/t1 of the outer diameter φ1 of the first reinforcing bar 5 and the second reinforcing bar 6 to the thickness t1 of the mechanical joint 7 is 0.30 in the embodiment, but is 0.25 to 0.37, More preferably, it can be 0.28 to 0.34.

１ 建物
２ 鉄筋継手構造
３ 柱
４ 梁
５ 第１の鉄筋
６ 第２の鉄筋
７ 機械式継手
９ ヒンジ領域
１０ 非ヒンジ領域
１２ 端部領域
１５ せん断補強筋 REFERENCE SIGNS LIST 1 building 2 rebar joint structure 3 column 4 beam 5 first rebar 6 second rebar 7 mechanical joint 9 hinged region 10 non-hinged region 12 end region 15 shear reinforcement bar

Claims (9)

柱と、前記柱に接続された梁と、を有し、前記梁は、前記柱との接続部に隣接する非ヒンジ領域と、前記非ヒンジ領域の、前記接続部の反対側の端部に隣接するヒンジ領域と、を有する建物に使用される鉄筋継手構造であって、
第１の鉄筋と、第２の鉄筋と、前記第１の鉄筋と前記第２の鉄筋とを接続する熱処理されていない機械式継手と、を有し、前記機械式継手は前記非ヒンジ領域に設けられ、
前記第１の鉄筋と前記第２の鉄筋の前記機械式継手が接続される端部領域における降伏点が５００Ｎ／ｍｍ2以上であり、前記第１の鉄筋と前記第２の鉄筋の外径に対する前記機械式継手の厚さの比が０．２５～０．３６である、鉄筋継手構造。 a post and a beam connected to the post, the beam having a non-hinged region adjacent a connection with the post and an end of the non-hinged region opposite the connection A rebar joint structure for use in a building having an adjacent hinge region, comprising:
a first rebar, a second rebar, and a non-heat treated mechanical joint connecting the first rebar and the second rebar, the mechanical joint in the non-hinged region. provided,
The yield point in the end region where the mechanical joint of the first reinforcing bar and the second reinforcing bar is connected is 500 N/mm 2 or more, and the outer diameter of the first reinforcing bar and the second reinforcing bar A reinforcing bar joint structure, wherein the mechanical joint has a thickness ratio of 0.25 to 0.36. 柱と、前記柱に接続された梁と、を有し、前記梁は、前記柱との接続部に隣接する非ヒンジ領域と、前記非ヒンジ領域の、前記接続部の反対側の端部に隣接するヒンジ領域と、を有する建物に使用される鉄筋継手構造であって、
第１の鉄筋と、第２の鉄筋と、前記第１の鉄筋と前記第２の鉄筋とを接続する機械式継手と、を有し、前記機械式継手は前記非ヒンジ領域に設けられ、
前記第１の鉄筋と前記第２の鉄筋の前記機械式継手が接続される端部領域における降伏点が５００Ｎ／ｍｍ2以上であり、前記機械式継手の引張強さが８００Ｎ／ｍｍ2以下であり、前記第１の鉄筋と前記第２の鉄筋の外径に対する前記機械式継手の厚さの比が０．２５～０．３６である、鉄筋継手構造。 a post and a beam connected to the post, the beam having a non-hinged region adjacent a connection with the post and an end of the non-hinged region opposite the connection A rebar joint structure for use in a building having an adjacent hinge region, comprising:
a first reinforcing bar, a second reinforcing bar, and a mechanical joint connecting the first reinforcing bar and the second reinforcing bar, the mechanical joint being provided in the non-hinged region;
The yield point in the end region where the mechanical joint of the first reinforcing bar and the second reinforcing bar is connected is 500 N/mm 2 or more, and the tensile strength of the mechanical joint is 800 N/mm 2 or less. wherein a ratio of the thickness of the mechanical joint to the outer diameters of the first reinforcing bar and the second reinforcing bar is 0.25-0.36. 前記厚さの比が０．２８～０．３４である、請求項１または２に記載の鉄筋継手構造。 The reinforcing bar joint structure according to claim 1 or 2, wherein the thickness ratio is 0.28-0.34. 柱と、前記柱に接続され、鉄筋継手構造を備える梁と、を有し、
前記梁は、前記柱との接続部に隣接する非ヒンジ領域と、前記非ヒンジ領域の、前記接続部の反対側の端部に隣接するヒンジ領域と、を有する建物であって、
前記鉄筋継手構造は、第１の鉄筋と、第２の鉄筋と、前記第１の鉄筋と前記第２の鉄筋とを接続する熱処理されていない機械式継手と、を有し、前記機械式継手は前記非ヒンジ領域に設けられ、
前記第１の鉄筋と前記第２の鉄筋の前記機械式継手が接続される端部領域における降伏点が５００Ｎ／ｍｍ 2 以上であり、前記第１の鉄筋と前記第２の鉄筋の外径に対する前記機械式継手の厚さの比が０．２５～０．３６である、建物。 a column and a beam connected to the column and comprising a rebar joint structure;
The beam has a non-hinged region adjacent to the connection with the column and a hinged region adjacent to the end of the non-hinged region opposite the connection ,
The rebar joint structure includes a first rebar, a second rebar, and an unheated mechanical joint connecting the first rebar and the second rebar, the mechanical joint is provided in the non-hinge region,
The yield point in the end region where the mechanical joint of the first reinforcing bar and the second reinforcing bar is connected is 500 N/mm 2 or more, and the outer diameter of the first reinforcing bar and the second reinforcing bar The building, wherein the mechanical joint has a thickness ratio of 0.25 to 0.36. 柱と、前記柱に接続され、鉄筋継手構造を備える梁と、を有し、
前記梁は、前記柱との接続部に隣接する非ヒンジ領域と、前記非ヒンジ領域の、前記接続部の反対側の端部に隣接するヒンジ領域と、を有する建物であって、
前記鉄筋継手構造は、第１の鉄筋と、第２の鉄筋と、前記第１の鉄筋と前記第２の鉄筋とを接続する熱処理されていない機械式継手と、を有し、前記機械式継手は前記非ヒンジ領域に設けられ、
前記第１の鉄筋と前記第２の鉄筋の前記機械式継手が接続される端部領域における降伏点が５００Ｎ／ｍｍ2以上であり、前記機械式継手の引張強さが８００Ｎ／ｍｍ2以下であり、前記第１の鉄筋と前記第２の鉄筋の外径に対する前記機械式継手の厚さの比が０．２５～０．３６である、建物。 a column and a beam connected to the column and comprising a rebar joint structure;
The beam has a non-hinged region adjacent to the connection with the column and a hinged region adjacent to the end of the non-hinged region opposite the connection,
The rebar joint structure includes a first rebar, a second rebar, and an unheated mechanical joint connecting the first rebar and the second rebar, the mechanical joint is provided in the non-hinge region,
The yield point in the end region where the mechanical joint of the first reinforcing bar and the second reinforcing bar is connected is 500 N/mm 2 or more, and the tensile strength of the mechanical joint is 800 N/mm 2 or less. and wherein the ratio of the thickness of the mechanical joint to the outer diameter of the first reinforcing bar and the second reinforcing bar is 0.25 to 0.36. 前記機械式継手は前記接続部に隣接して設けられている、請求項４または５に記載の建物。 6. A building according to claim 4 or 5 , wherein said mechanical joint is provided adjacent to said connection. 前記第１の鉄筋は前記非ヒンジ領域と前記ヒンジ領域とに渡って設けられ、前記第１の鉄筋の前記非ヒンジ領域における降伏点は、前記ヒンジ領域における降伏点より大きい、請求項４から６のいずれか１項に記載の建物。 7. The first rebar is provided over the non-hinge region and the hinge region, and the yield point of the first rebar in the non-hinge region is greater than the yield point in the hinge region. The building according to any one of the above . 前記ヒンジ領域及び前記非ヒンジ領域にせん断補強筋を有し、前記非ヒンジ領域のせん断補強筋の径は前記ヒンジ領域のせん断補強筋の径より大きい、請求項４から７のいずれか１項に記載の建物。 8. The hinge region and the non-hinge region having shear reinforcing bars, wherein the diameter of the shear reinforcing bars in the non-hinge region is larger than the diameter of the shear reinforcing bars in the hinge region. listed building. 柱と、前記柱に接続され、鉄筋継手構造を備える梁と、を有し、前記梁は、前記柱との接続部に隣接する非ヒンジ領域と、前記非ヒンジ領域の、前記接続部の反対側の端部に隣接するヒンジ領域と、を有する建物における前記鉄筋継手構造の施工方法であって、
第１の鉄筋と第２の鉄筋とを、前記非ヒンジ領域に設けられ熱処理されていない機械式継手で接続することを有し、
前記第１の鉄筋と前記第２の鉄筋の前記機械式継手が接続される端部領域における降伏点が５００Ｎ／ｍｍ2以上であり、前記第１の鉄筋と前記第２の鉄筋の外径に対する前記機械式継手の厚さの比が０．２５～０．３６である、鉄筋継手構造の施工方法。 a column and a beam connected to the column and comprising a rebar joint structure, the beam comprising a non-hinged region adjacent to the connection with the column and a non-hinged region opposite the connection a hinge region adjacent to a side edge; and
connecting the first rebar and the second rebar with a non-heat treated mechanical joint provided in the non-hinged region ;
The yield point in the end region where the mechanical joint of the first reinforcing bar and the second reinforcing bar is connected is 500 N/mm 2 or more, and the outer diameter of the first reinforcing bar and the second reinforcing bar A method for constructing a reinforcing bar joint structure, wherein the thickness ratio of the mechanical joint is 0.25 to 0.36.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010209564A (en) 2009-03-10 2010-09-24 Kajima Corp Sleeve with flange part
WO2014118713A1 (en) 2013-01-29 2014-08-07 Eiseko Engineering Building system for the construction industry
JP2017155467A (en) 2016-03-01 2017-09-07 高周波熱錬株式会社 Reinforcement structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010209564A (en) 2009-03-10 2010-09-24 Kajima Corp Sleeve with flange part
WO2014118713A1 (en) 2013-01-29 2014-08-07 Eiseko Engineering Building system for the construction industry
JP2017155467A (en) 2016-03-01 2017-09-07 高周波熱錬株式会社 Reinforcement structure

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