JP4557711B2 - Reinforcement structure around openings in reinforced concrete beams - Google Patents

Reinforcement structure around openings in reinforced concrete beams Download PDF

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JP4557711B2
JP4557711B2 JP2004377171A JP2004377171A JP4557711B2 JP 4557711 B2 JP4557711 B2 JP 4557711B2 JP 2004377171 A JP2004377171 A JP 2004377171A JP 2004377171 A JP2004377171 A JP 2004377171A JP 4557711 B2 JP4557711 B2 JP 4557711B2
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opening
bars
diagonal
bar
main
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JP2006183311A (en
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久廣 平石
宏彰 江戸
功治 岡
邦夫 早川
紀雄 鈴木
弘幸 都祭
英夫 塚越
崇博 毛井
拓 石岡
達也 今西
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Kajima Corp
Obayashi Corp
Takenaka Corp
Penta Ocean Construction Co Ltd
Okumura Corp
Toda Corp
Shimizu Corp
Ohmoto Gumi Co Ltd
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Kajima Corp
Obayashi Corp
Takenaka Corp
Penta Ocean Construction Co Ltd
Okumura Corp
Toda Corp
Shimizu Corp
Ohmoto Gumi Co Ltd
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Description

この発明は鉄筋コンクリート造の梁に設備配管用の貫通孔等の開口部が形成される場合に、その開口部回りを補強する鉄筋コンクリート梁における開口部回りの補強構造に関するものである。   The present invention relates to a reinforcing structure around an opening in a reinforced concrete beam that reinforces around the opening when an opening such as a through hole for equipment piping is formed in a reinforced concrete beam.

鉄筋コンクリート造（ＳＲＣ造を含む）の梁に貫通孔等の開口部を形成する場合、開口部回りの補強には図17に示すように鉄筋を網状に組み立てた補強金物や、図18、図19に示すようにＺ字形に折り曲げられた斜め筋、あるいは図20に示すように鉄筋を２方向に組み合わせた溶接金網等が用いられる。   When an opening such as a through hole is formed in a beam of reinforced concrete (including SRC structure), reinforcement around the opening is as shown in FIG. As shown in FIG. 20, diagonal bars bent into a Z shape, or a welded wire mesh in which reinforcing bars are combined in two directions as shown in FIG.

開口部の位置と大きさは梁の全長と全成等によって制限があるが、開口部の断面（径）を大きくせざるを得ない場合や、梁端部等、応力的に厳しい位置に開口部を形成せざるを得ない場合には、上記補強金物や斜め筋等を密に配置する必要が生じるため、開口部回りに納まりきれない、あるいはせん断補強筋の配筋やコンクリートの充填性を阻害することが起こる。   The position and size of the opening are limited by the overall length and completeness of the beam. However, if the opening cross section (diameter) must be increased, or if the opening of the beam is severely stressed When it is necessary to form a part, it is necessary to closely arrange the reinforcing hardware and diagonal stripes, etc., so that it cannot fit around the opening, or the reinforcement of the shear reinforcement bars and the filling of concrete Inhibiting happens.

この補強金物や斜め筋等を密に配置せざるを得ない場合の納まりの問題に対し、渦巻き状の補強金物と斜め筋を組み合わせ、直線状の斜め筋を補強金物から分離させることで、開口部回りに補強金物を先行して配置した後の斜め筋の配筋作業性をよくし、梁幅の相違にも対応可能な補強方法がある（特許文献１参照）。   To solve the problem of fitting when it is necessary to arrange the reinforcement hardware and diagonal stripes closely, the spiral reinforcement hardware and the diagonal stripes are combined to separate the linear diagonal stripes from the reinforcement hardware. There is a reinforcement method that improves the workability of diagonal reinforcement after arranging reinforcement hardware around the part in advance and can cope with the difference in beam width (see Patent Document 1).

また開口部回りにＰＣ鋼棒等の鋼材を斜めに配置し、これに緊張力を与えて開口部回りのコンクリートにプレストレスを導入することで、少ない鋼材数で効率的にコンクリートを補強する方法がある（特許文献２参照）。
特開平8-184127号公報 特開2004-124623号公報 A method of reinforcing concrete efficiently with a small number of steel materials by placing steel materials such as PC steel bars obliquely around the opening and applying prestress to the concrete around the opening by applying tension to the steel. (See Patent Document 2).
JP-A-8-184127 JP 2004-124623 A

特許文献１の方法では斜め筋を梁幅の相違に対応可能とする必要から、斜め筋の一方の端部にしかフックが形成されないため、フックが形成されない他方の端部は単純にコンクリート中に定着されるに過ぎない。従って斜め筋は梁に作用するせん断力及び曲げモーメントに対し、梁の全成に亘って引張力を負担することができないため、斜め筋の配筋によって梁の耐力を大幅に高めることにはならない。   In the method of Patent Document 1, since it is necessary to make it possible to cope with the difference in the beam width of the oblique line, since the hook is formed only at one end part of the oblique line, the other end part where the hook is not formed is simply placed in the concrete. It is only settled. Therefore, the diagonal reinforcement cannot bear the tensile force throughout the beam against the shearing force and bending moment acting on the beam, so the reinforcement of the diagonal reinforcement does not significantly increase the beam strength. .

また斜め筋に渦巻き状の補強金物を併用することから、開口部回りにおける鋼材量が多くなり、コンクリートの充填性を阻害する可能性がある他、配筋作業上、せん断補強筋の配筋前に補強金物を先行して配置し、せん断補強筋の配筋後に斜め筋を配筋せざるを得ないため、配筋作業効率が犠牲になる。   In addition, since the spiral reinforcement is used together with the diagonal reinforcement, the amount of steel around the opening increases, which may impair concrete filling properties. In this case, the reinforcement hardware is arranged in advance, and the diagonal reinforcement must be laid after the reinforcement of the shear reinforcement.

特許文献２の方法では鋼材の両端がコンクリートの上端と下端に定着されることで、鋼材は梁の全成に亘って引張力を負担することができるため、梁の耐力を高めることが可能であると考えられるが、鋼材の端部を定着させるための定着部をコンクリートの上端と下端に切り欠いて形成しなければならないため、型枠の形状が複雑化する等、施工が煩雑になる上、切り欠いた定着部において主筋の被りを確保することが難しくなる。   In the method of Patent Document 2, since both ends of the steel material are fixed to the upper and lower ends of the concrete, the steel material can bear a tensile force throughout the beam, so that it is possible to increase the strength of the beam. Although it is thought that there is, the fixing part for fixing the end of the steel material must be formed by cutting out the upper and lower ends of the concrete, so the construction of the formwork becomes complicated and the construction becomes complicated It becomes difficult to ensure the covering of the main bars in the cutout fixing portion.

この発明は上記背景より、開口部回りを補強する上で、配筋作業性を含めて施工性がよく、梁の耐力を高めることが可能な補強構造を提案するものである。   In view of the above background, the present invention proposes a reinforcing structure that has good workability including reinforcement workability and can enhance the proof stress of the beam when reinforcing the periphery of the opening.

本願の請求項１に係る発明では、上端主筋及び下端主筋とせん断補強筋が配筋された鉄筋コンクリート造の梁に幅方向に貫通して形成される開口部の回りを、主筋に対し、傾斜して配筋される複数本の斜め筋を用いて補強する構造において、斜め筋の両端にフックを形成し、一方のフックを上端主筋に係合させ、他方のフックを下端主筋に係合させることにより、配筋作業性を高めながら、梁の耐力も高めることを可能にする。   In the invention according to claim 1 of the present application, the opening around the opening formed through the reinforced concrete beam in which the upper and lower main bars and the shear reinforcement bars are arranged in the width direction is inclined with respect to the main bars. In a structure that reinforces using multiple diagonal bars that are arranged in a row, hooks are formed at both ends of the diagonal bars, one hook is engaged with the upper main bar, and the other hook is engaged with the lower main bar. This makes it possible to increase the bearing strength of the beam while increasing the workability of the bar arrangement.

斜め筋の両端が上端主筋と下端主筋に係合することで、斜め筋と上端主筋間、及び斜め筋と下端主筋間での引張力の伝達が図られるため、梁に作用するせん断力及び曲げモーメントに対し、斜め筋が梁の全成に亘って引張力を負担することが可能になり、斜め筋はせん断力に対し、上端主筋、または下端主筋とせん断補強筋、及びコンクリートと共に図９に示すようなトラス機構を形成する。同じ斜め筋を用いた図18、図19では斜め筋の端部が主筋に係合していないため、斜め筋と主筋間での十分な引張力の伝達が行われることはない。   Since both ends of the diagonal muscles engage with the upper and lower principal bars, the tensile force is transmitted between the diagonal muscles and the upper principal muscles, and between the oblique muscles and the lower principal muscles. With respect to the moment, it becomes possible for the oblique bars to bear the tensile force throughout the beam, and the oblique bars are shown in FIG. 9 together with the upper main bars or the lower main bars and the shear reinforcement bars and the concrete with respect to the shear forces. Form a truss mechanism as shown. In FIGS. 18 and 19 using the same oblique muscle, since the end of the oblique muscle is not engaged with the main muscle, a sufficient tensile force is not transmitted between the oblique muscle and the main muscle.

例えば図９に示すように梁の中間部に鉛直下向きの集中荷重が作用したときの曲げモーメントに対しては上端主筋が引張力を負担し、下端側のコンクリートが圧縮力を負担することにより抵抗し、柱においては梁の上端主筋と下端主筋の引張力による偶力によって抵抗する。斜め筋は交互に繰り返される正負のせん断力に対して抵抗するために、２本で一組となり、互いに交差して配筋される。   For example, as shown in FIG. 9, the upper main reinforcement bears a tensile force against the bending moment when a vertically downward concentrated load acts on the middle part of the beam, and the concrete at the lower end bears a compressive force. However, in the column, it resists by a couple of forces due to the tensile force of the upper and lower main bars of the beam. In order to resist the positive and negative shearing forces that are alternately repeated, the diagonal stripes are arranged in pairs, and are arranged crossing each other.

せん断力に対しては開口部以外の部分において図９中、斜めの白抜きの矢印で示す、梁のコンクリートに形成される圧縮ストラットと、ハッチを入れた矢印で示す、スターラップ等のせん断補強筋が負担する引張力と、水平の白抜きの矢印で示す、上端主筋、または下端主筋の引張力によって構成されるトラス機構によって抵抗し、柱においてはコンクリートが圧縮力を負担することにより抵抗する。   With respect to shear force, in the part other than the opening, in FIG. 9, the compression struts formed on the concrete of the beam, which are indicated by diagonal white arrows, and the shear reinforcement such as stirrup, which are indicated by hatched arrows Resist by the truss mechanism composed of the tensile force borne by the muscle and the tensile strength of the upper or lower main bar indicated by the horizontal white arrow, and in the column, the concrete resists by bearing the compressive force .

せん断補強筋が配筋されない開口部回りにおいては梁のコンクリートに形成される圧縮ストラットと、図９中、黒塗りの矢印で示す、斜め筋が負担する引張力と、上端主筋と下端主筋の引張力によって構成されるトラス機構によって抵抗する。開口部回りに配筋されたせん断補強筋も引張力を負担し、斜め筋の負担を軽減する。斜め筋は開口部回りにおいてはせん断補強筋の役目を果たすことになる。   Compressive struts formed on the concrete of the beam around the opening where the shear reinforcement is not arranged, the tensile force borne by the diagonal bars, as indicated by the black arrows in FIG. 9, and the tension of the upper and lower main bars Resistes by truss mechanism composed by force. Shear reinforcement bars arranged around the opening also bear the tensile force and reduce the strain on the diagonal lines. The oblique bars serve as shear reinforcement bars around the opening.

せん断補強筋が配筋されない開口部回りにおいて、斜め筋が形成するトラス機構によってせん断力に対する抵抗機構が確保されることで、開口部を有する梁のせん断耐力が向上し、せん断破壊に先行して曲げ破壊を生じさせることができるため、曲げ降伏後の梁の変形性能が向上し、それに伴ってエネルギ吸収性能も向上する。   Around the opening where no shear reinforcement is placed, the truss mechanism formed by the diagonal streaks ensures a resistance mechanism against shear force, which improves the shear strength of the beam with the opening and leads to shear failure Since bending fracture can be caused, the deformation performance of the beam after bending yielding is improved, and the energy absorption performance is also improved accordingly.

２本で一組となった斜め筋は具体的には請求項２に記載のように、開口部の長さ方向、すなわち梁の幅方向の両側位置を均等に補強するために梁の図心、すなわち材軸に直交する鉛直断面上の中心を含む鉛直面の両側に配置される。また開口部の幅方向、すなわち梁の長さ方向の両側位置を均等に補強するためにその鉛直面の片側につき、開口部を挟んで両側に配置される。   Specifically, as shown in claim 2, the diagonal streaks formed as a set of two are centroids of the beam in order to uniformly reinforce the positions of both sides in the length direction of the opening, that is, the width direction of the beam. That is, it is arrange | positioned on the both sides of the vertical surface containing the center on the vertical cross section orthogonal to a material axis. Further, in order to uniformly reinforce the positions of both sides in the width direction of the opening, that is, the length direction of the beam, one side of the vertical surface is arranged on both sides with the opening interposed therebetween.

請求項２の場合、一組の斜め筋は開口部の回りに４箇所配置されることになるが、この場合に限られず、一組につき、斜め筋は２本であることと、各斜め筋は独立していることで、梁の前記鉛直断面上、せん断補強筋の内側等、せん断補強筋や中子筋との干渉が生じない位置に配筋されることができる上、主筋の回りにせん断補強筋や中子筋が配筋された後にもこれらの合間を縫って配筋されることができるため、配筋作業性が複雑化することはなく、配筋手順上の自由度も高い。   In the case of claim 2, a set of diagonal stripes is arranged at four locations around the opening. However, the present invention is not limited to this, and there are two diagonal stripes per set. Is independent, it can be arranged on the vertical section of the beam, inside the shear reinforcement, etc., at a position where it does not interfere with the shear reinforcement or core, and around the main reinforcement Even after shear reinforcement bars and core bars are laid, they can be sewed between them, so the workability of the bar arrangement is not complicated and the flexibility of the bar arrangement procedure is high. .

また開口部回りの補強に要する部材が１種類の斜め筋であることで、斜め筋の配筋のみによって補強が完了するため、配筋作業効率が高く、コンクリートの充填性を阻害する可能性もない。   In addition, since the member required for reinforcement around the opening is one kind of diagonal reinforcement, reinforcement is completed only by the diagonal reinforcement arrangement, so the arrangement work efficiency is high and the possibility of hindering the filling of concrete is also possible. Absent.

各斜め筋のフックは上端主筋と下端主筋の、せん断補強筋や中子筋が巻き付いていない部分に掛かって係合する。斜め筋の両端が主筋に係合して定着されることで、緊張力が与えられる場合のような施工の煩雑化と、被り不足の問題は発生しない。   The hooks of the diagonal bars are engaged with the upper and lower main bars where the shear reinforcement bars and the core bars are not wound. Since both ends of the oblique muscle are engaged and fixed to the main muscle, the problem of construction complexity and insufficient covering as in the case where tension is applied does not occur.

請求項３に係る発明は、少なくとも開口部を挟む一側に配置される斜め筋については、高さ方向中央部で屈曲させたくの字形の斜め筋の両端を用い、その両端に形成されたフックの一方を上端主筋に、他方を下端主筋に係合させるようにしたものである。   The invention according to claim 3 is that hooks formed at both ends of the diagonal stripes arranged at least on one side across the opening portion are used at both ends of a dogleg-shaped diagonal stripe bent at the center in the height direction. One of these is engaged with the upper main bar and the other is engaged with the lower main bar.

斜め筋どうしを交差させる十分なスペースが確保できない場合においても、斜め筋と上端主筋間及び下端主筋間での引張力の伝達が図られるため、梁に作用するせん断力及び曲げモーメントに対し、斜め筋が梁の全成に亘って引張力を負担することが可能になり、請求項１に係る発明に近い効果が得られる。   Even when there is not enough space to cross the diagonal bars, the tensile force can be transmitted between the diagonal bars and the upper main bar and between the lower main bars, so that the shearing force and bending moment acting on the beam It becomes possible for the streak to bear the tensile force throughout the beam, and an effect close to that of the invention according to claim 1 can be obtained.

例えば、開口部が梁端近傍に形成される場合、開口部と梁端との間に十分なスペースがない場合などに、くの字形の斜め筋を用いるメリットがある。その場合、開口部がくの字の内角側にくるが、外角側すなわち柱側においては梁の軸方向の応力伝達が不十分となる恐れがあるので、その場合には、請求項５のように、屈曲させた斜め筋の高さ方向中央部を、一端が柱断面内に定着されるアンカー筋につなぐことで、応力のスムーズな伝達が図れる。   For example, when the opening is formed in the vicinity of the beam end, there is an advantage of using a dogleg-shaped oblique line when there is not enough space between the opening and the beam end. In that case, the opening comes on the inner corner side of the dogleg, but on the outer corner side, that is, on the column side, there is a risk that the stress transmission in the axial direction of the beam will be insufficient, and in that case, as in claim 5 By connecting the central part in the height direction of the bent oblique line to the anchor line, one end of which is fixed in the column cross section, the stress can be transmitted smoothly.

請求項４に係る発明は、少なくとも開口部を挟む一側に配置される斜め筋について、高さ方向中央部で屈曲させたくの字形の斜め筋の一端にフックが形成されたものを、２本一組で互いにフックが反対側の端部にくるように重ね合わせて用い、一方の斜め筋のフックを上端主筋に係合し、他方の斜め筋のフックを下端主筋に係合させるようにしたものである。   In the invention according to claim 4, at least two oblique stripes arranged on one side across the opening are formed with hooks formed at one end of a dogleg-shaped oblique stripe bent at the center in the height direction. One set is used so that the hooks come to the opposite ends, and one diagonal muscle hook is engaged with the upper main muscle, and the other diagonal muscle hook is engaged with the lower main muscle. Is.

請求項３に係る発明と同様、開口部が梁端近傍に形成される場合、請求項５のように、屈曲させた斜め筋の高さ方向中央部を、一端が柱断面内に定着されるアンカー筋につなぐことで、応力のスムーズな伝達が図れる。   As in the invention according to claim 3, when the opening is formed in the vicinity of the beam end, as in claim 5, the central portion in the height direction of the bent oblique line is fixed in the column cross section. By connecting to the anchor muscle, the stress can be transmitted smoothly.

２本一組で用いたくの字形の斜め筋は、コンクリートに埋め込まれた状態で、重ね合わせ部分が重ね継手として機能するが、アンカー筋を併用することで梁の軸方向の応力伝達がスムーズとなる。   The pair of double-shaped diagonal bars used in a set of two functions as a lap joint when embedded in concrete. However, by using anchor bars together, the stress transmission in the axial direction of the beam is smooth. Become.

請求項６に係る発明は、開口部の外側を取り巻くリング筋とリング筋の上下に延びる複数本の斜め筋を組み合わせてなる補強筋を用い、上方へ延びる斜め筋のフックを上端主筋に係合し、下方へ延びる斜め筋のフックを下端主筋に係合することで、斜め筋と主筋間での十分な引張力の伝達が行われるようにしている。   The invention according to claim 6 uses a reinforcing bar formed by combining a ring line surrounding the outside of the opening and a plurality of diagonal lines extending vertically above the ring line, and engages a hook of the diagonal line extending upward with the upper main muscle. Then, the hook of the diagonal muscle extending downward is engaged with the lower main muscle, so that a sufficient tensile force is transmitted between the diagonal muscle and the main muscle.

この場合、請求項１に係る発明に比べると、配筋手順上の自由度が低減するが、開口部が梁端近傍に形成される場合などにおいても、比較的作業性に優れ、かつ斜め筋と主筋間での十分な引張力の伝達が行われ、梁のせん断耐力が向上し、曲げ降伏後の梁の変形性能が向上し、それに伴ってエネルギ吸収性能も向上する。   In this case, the degree of freedom in the bar arrangement procedure is reduced as compared with the invention according to claim 1, but even when the opening is formed in the vicinity of the beam end, the workability is relatively excellent, and the diagonal line As a result, a sufficient tensile force is transmitted between the main reinforcement and the beam, the shear strength of the beam is improved, the deformation performance of the beam after bending yielding is improved, and the energy absorption performance is also improved accordingly.

斜め筋の両端を上端主筋と下端主筋に係合させて斜め筋と上端主筋間、及び下端主筋間での引張力の伝達を図ることで、梁に作用するせん断力に対し、斜め筋が梁の全成に亘って引張力を負担することができるため、せん断補強筋が配筋されない開口部回りにおいて斜め筋が上端主筋、または下端主筋とせん断補強筋、及びコンクリートと共にトラス機構を形成してせん断力に抵抗することができる。   By engaging both ends of the oblique muscles with the upper and lower principal bars to transmit the tensile force between the oblique and upper principal bars and between the lower principal bars, the diagonal muscles can be applied to the shear force acting on the beams. Since the tensile force can be borne throughout, the slanted muscle forms a truss mechanism with the upper main bar, or the lower main bar and the shear reinforcing bar, and the concrete around the opening where the shear reinforcing bar is not arranged. Can resist shear forces.

斜め筋によるせん断力に対する抵抗機構が確保されることで、開口部を有する梁のせん断耐力が向上し、せん断破壊に先行して曲げ破壊を発生させることができるため、曲げ降伏後の梁の変形性能、及びエネルギ吸収性能が向上する。   By securing a resistance mechanism against the shearing force due to the diagonal streak, the shear strength of the beam with the opening is improved, and bending failure can occur prior to shearing failure. Performance and energy absorption performance are improved.

請求項１に係る発明では、斜め筋は１本毎に独立していることで、せん断補強筋や中子筋が配筋された後にも配筋可能であるため、配筋作業性がよく、配筋手順上の自由度も高い。また開口部回りの補強に要する部材が１種類の斜め筋のみで済むため、配筋作業効率が高く、コンクリートの回りを阻害することもない。   In the invention according to claim 1, since the diagonal reinforcing bars are independent for each line, the reinforcing bars can be arranged even after the shear reinforcing bars and the core reinforcing bars are arranged. There is also a high degree of freedom in the bar arrangement procedure. In addition, since only one type of diagonal reinforcement is required for reinforcement around the opening, the arrangement work efficiency is high and the surroundings of the concrete are not hindered.

各斜め筋のフックは上端主筋と下端主筋の、せん断補強筋や中子筋が巻き付いていない部分に掛かって係合した状態で定着させれば、緊張力が与えられる場合のように施工が煩雑化することもなく、被りが不足する問題も発生しない。   If the hook of each diagonal muscle is fixed in the state where it is hooked and engaged with the part of the upper and lower principal bars where the shear reinforcement or core does not wrap, the construction is complicated as if tension is applied. The problem of lack of covering does not occur.

この発明は上端主筋２及び下端主筋３とせん断補強筋４が配筋され、幅方向に開口部５が貫通して形成された鉄筋コンクリート造の梁１において、図１に示すように２本で一組となり、互いに交差して配筋される複数本の斜め筋６、６を用いて補強した補強構造である。梁１は鉄骨鉄筋コンクリート造の場合もある。せん断補強筋４は中子筋を含み、一本単位で独立している場合とスパイラル状に連続している場合がある。   The present invention relates to a reinforced concrete beam 1 in which an upper end main bar 2 and a lower end main bar 3 and a shear reinforcement bar 4 are arranged and an opening 5 is formed in the width direction so as to have two as shown in FIG. The reinforcing structure is reinforced by using a plurality of oblique muscles 6 and 6 arranged in a set and intersecting each other. The beam 1 may be a steel reinforced concrete structure. The shear reinforcing bar 4 includes a core bar and may be independent in a single unit or may be continuous in a spiral shape.

斜め筋６は図１、図２に示すようにせん断補強筋４のピッチより大きい長さを持ち、両端にフック6a、6aが形成された形をし、一方のフック6aにおいて上端主筋２に係合し、他方のフック6aにおいて下端主筋３に係合する。   As shown in FIGS. 1 and 2, the diagonal reinforcement 6 has a length larger than the pitch of the shear reinforcement 4 and is formed with hooks 6a and 6a at both ends, and is engaged with the upper end main reinforcement 2 at one hook 6a. The other hook 6a engages with the lower end main reinforcement 3.

フック6a、6aが上端主筋２と下端主筋３に係合したときにコンクリートの被り厚さを確保でき、コンクリート中で係合状態を維持できれば、フック6aの角度は90°、135°、180°のいずれでもよく、図２のｘ−ｘ線断面図である図３〜図８に示すように梁１の材軸に直交する鉛直断面上の、斜め筋６の上端主筋２や下端主筋３に対する位置等によって決められる。   When the hooks 6a, 6a are engaged with the upper main bar 2 and the lower main bar 3, the concrete covering thickness can be secured, and if the engaged state can be maintained in the concrete, the angle of the hook 6a is 90 °, 135 °, 180 °. As shown in FIGS. 3 to 8 which are cross-sectional views taken along the line xx of FIG. 2, the upper main bar 2 and the lower main bar 3 of the diagonal line 6 on the vertical cross section perpendicular to the material axis of the beam 1 are used. It is decided by the position etc.

２本で一組の斜め筋６，６は基本的に図１に示すように梁１の図心、すなわち材軸に直交する鉛直断面上の中心を含む鉛直面の両側に配置され、その鉛直面の片側につき、開口部５を挟んで両側に配置されるが（請求項２）、前記鉛直面の位置に付加的に配置されることもある。開口部５はその位置にスリーブ７を埋設することにより形成され、形状は円形とは限らない。   As shown in FIG. 1, two pairs of diagonal stripes 6 and 6 are basically arranged on both sides of the centroid of the beam 1, that is, on both sides of the vertical plane including the center on the vertical section perpendicular to the material axis. One side of the surface is disposed on both sides of the opening 5 (Claim 2), but may be additionally disposed at the position of the vertical surface. The opening 5 is formed by embedding the sleeve 7 at the position, and the shape is not necessarily circular.

各斜め筋６がせん断補強筋４のピッチより大きい長さを持つ関係から、一組の斜め筋６，６は梁１の前記鉛直断面上、せん断補強筋４と重複しないよう、せん断補強筋４の内側に配筋される。梁１の立面（側面）上は図２、図９に示すように梁１のコンクリートが形成する圧縮ストラットと共に斜め筋６の引張力がトラス機構を形成し得るよう、圧縮ストラットの角度に対応した角度、例えば水平に対して30°〜60°程度の角度で互いに交差する。   Since each diagonal reinforcement 6 has a length larger than the pitch of the shear reinforcement 4, the pair of diagonal reinforcements 6, 6 does not overlap the shear reinforcement 4 on the vertical cross section of the beam 1. The bar is arranged inside. The elevation (side) of the beam 1 corresponds to the angle of the compression strut so that the tensile force of the oblique muscle 6 can form a truss mechanism with the compression strut formed by the concrete of the beam 1 as shown in FIGS. Intersect each other at an angle of, for example, about 30 ° to 60 ° with respect to the horizontal.

図２では梁１の立面上、開口部５を挟んで両側に配置された二組の斜め筋６、６の、開口部５寄りのフック6a、6aが上端主筋２と下端主筋３の位置で交わるように二組の斜め筋６、６を配置しているが、上端主筋２と下端主筋３の位置より図心寄りでフック6a、6aが交わるように配置する場合や、上端主筋２と下端主筋３の位置で二組の斜め筋６、６のフック6a、6aが距離を隔てるように配置する場合もある。   In FIG. 2, the hooks 6 a and 6 a near the opening 5 of the two pairs of diagonal muscles 6 and 6 arranged on both sides of the opening 5 on the elevation surface of the beam 1 are the positions of the upper main bar 2 and the lower main bar 3. The two diagonal muscles 6 and 6 are arranged so as to cross each other. However, when the hooks 6a and 6a are arranged so that they cross the centroid from the positions of the upper main muscle 2 and the lower main muscle 3, the upper main muscle 2 and There are also cases where the hooks 6a, 6a of the two pairs of oblique muscles 6 and 6 are arranged at a distance from each other at the position of the lower end main reinforcement 3.

図３は前記鉛直面の片側につき、梁１の幅方向外側に位置する上端主筋２の内側の上端主筋２と、同じく外側に位置する下端主筋３の内側の下端主筋３との間に一組の斜め筋６，６を掛け渡し、梁１の鉛直断面上、斜め筋６，６を互いに平行に配置した場合である。   FIG. 3 shows a pair between the upper main bar 2 inside the upper main bar 2 located on the outer side in the width direction of the beam 1 and the lower main bar 3 inside the lower main bar 3 located on the outer side. This is a case where the diagonal stripes 6 and 6 are spanned and the diagonal stripes 6 and 6 are arranged parallel to each other on the vertical cross section of the beam 1.

図４は前記鉛直面の片側につき、梁１の幅方向外側の上端主筋２と内側の下端主筋３との間、及び外側の下端主筋３と内側の上端主筋２との間に一組の斜め筋６，６を掛け渡した場合であり、斜め筋６，６は梁１の鉛直断面上、互いに交差して配置される。   FIG. 4 shows a pair of slanted one side of the vertical plane between the upper main bar 2 on the outer side in the width direction of the beam 1 and the inner lower main bar 3, and between the outer lower main bar 3 and the inner upper main bar 2. This is a case where the lines 6 and 6 are spanned, and the diagonal lines 6 and 6 are arranged so as to cross each other on the vertical cross section of the beam 1.

図３、図４は斜め筋６をＣ字形、あるいは逆Ｃ字形に形成した場合の配筋例であるが、斜め筋６をＳ字形、あるいは逆Ｓ字形に形成した場合の配筋例を図５〜図８に示す。この他、Ｃ字形の斜め筋６とＳ字形の斜め筋６を組み合わせて一組の斜め筋６，６を構成することもある。   FIGS. 3 and 4 show examples of bar arrangement when the diagonal line 6 is formed in a C-shape or an inverted C-shape. FIG. 3 and FIG. 4 show examples of bar arrangement when the diagonal line 6 is formed in an S-shape or an inverted S-shape. 5 to 8 show. In addition, a pair of oblique stripes 6 and 6 may be configured by combining the C-shaped oblique stripes 6 and the S-shaped oblique stripes 6.

図５、図６は前記鉛直面の片側につき、梁１の幅方向外側の上端主筋２と外側の下端主筋３との間、及び内側の上端主筋２と内側の下端主筋３との間に一組の斜め筋６，６を掛け渡した場合であり、図５は梁１の鉛直断面上、斜め筋６，６を互いに平行に配置した場合、図６は非平行に配置した場合である。   5 and 6 show one side of the vertical plane between the upper principal bar 2 on the outer side in the width direction of the beam 1 and the outer lower principal bar 3 and between the inner upper principal bar 2 and the inner lower principal bar 3. FIG. 5 shows the case where the diagonal stripes 6 and 6 are arranged parallel to each other on the vertical cross section of the beam 1, and FIG. 6 shows the case where they are arranged non-parallel.

図７は前記鉛直面の片側につき、梁１の幅方向外側の上端主筋２と内側の下端主筋３との間、及び外側の下端主筋３と内側の上端主筋２との間に一組の斜め筋６，６を掛け渡した場合であり、斜め筋６，６は梁１の鉛直断面上、互いに交差して配置される。   FIG. 7 shows a pair of diagonal lines between the upper principal bar 2 on the outer side in the width direction of the beam 1 and the inner lower principal bar 3 and between the outer lower principal bar 3 and the inner upper principal bar 2 on one side of the vertical plane. This is a case where the lines 6 and 6 are spanned, and the diagonal lines 6 and 6 are arranged so as to cross each other on the vertical cross section of the beam 1.

図８は前記鉛直面の片側につき、梁１の幅方向外側の上端主筋２と外側の下端主筋３との間に一組の斜め筋６，６を掛け渡した場合であり、斜め筋６，６は梁１の鉛直断面上、互いに交差して配置される。   FIG. 8 shows a case where a pair of oblique muscles 6, 6 are spanned between the upper principal bar 2 on the outer side in the width direction of the beam 1 and the outer lower principal bar 3 on one side of the vertical plane. 6 are arranged to cross each other on the vertical cross section of the beam 1.

図10は開口部５が梁端近傍にある場合、すなわち柱11と梁１の接合部近傍に位置している場合の補強構造の一形態を例を示したものである。   FIG. 10 shows an example of one form of the reinforcing structure when the opening 5 is in the vicinity of the beam end, that is, in the vicinity of the joint between the column 11 and the beam 1.

この図10の例は、開口部５を挟んで両側に配置された二組の斜め筋６、６のうち、スペースに余裕のない梁端側で交差の角度を小さくして対処しているが、斜め筋６、６のフック6a、6aと上端主筋２及び下端主筋３との関係は、基本的に図２の場合と同様である。   In the example of FIG. 10, among the two pairs of diagonal stripes 6 and 6 arranged on both sides of the opening 5, the crossing angle is reduced on the beam end side where there is not enough space. The relationship between the hooks 6a, 6a of the diagonal lines 6 and 6, the upper main bar 2 and the lower main bar 3 is basically the same as in the case of FIG.

図11は図10の実施形態に対し、開口部５を挟む反対側においても一組の斜め筋６、６の交差の角度を小さくした場合であり、柱11断面内のコンクリートに定着されたアンカー筋９及び梁１の断面内のコンクリートに定着されたアンカー筋８を、開口部５の両側でそれぞれ斜め筋６、６の交差部とつなぐことで、応力伝達の不足分を補っている。   FIG. 11 shows a case where the angle of intersection of a pair of diagonal stripes 6 and 6 is reduced on the opposite side across the opening 5 with respect to the embodiment of FIG. The anchor bars 8 fixed to the concrete in the cross section of the bars 9 and the beams 1 are connected to the intersections of the diagonal bars 6 and 6 on both sides of the opening 5 to compensate for the lack of stress transmission.

図12は同様に開口部５が梁端近傍にある場合であるが、請求項３の一実施形態にあたるものであり、開口部５と梁端との間に用いられる斜め筋16として、高さ方向（梁成方向）中央部で屈曲させたくの字形の斜め筋16を用い、その両端に形成されたフック（立面には表れていない）の一方を上端主筋２に、他方を下端主筋３に係合させている。   FIG. 12 similarly shows the case where the opening 5 is in the vicinity of the beam end, but corresponds to one embodiment of the present invention, and the height of the diagonal streak 16 used between the opening 5 and the beam end is as shown in FIG. In the direction of the beam (in the direction of beam formation), a diagonal-shaped bar 16 is bent at the center, and one of the hooks (not shown on the elevation) formed at both ends is the upper main bar 2 and the other is the lower main bar 3 Is engaged.

この場合、開口部５はくの字形に屈曲させた内角側にくるが、屈曲させた斜め筋16の高さ方向中央部を、一端が柱11のコンクリート断面内に定着されるアンカー筋９とつなぐことで（請求項５に対応）、引張力の伝達を図っている。   In this case, the opening 5 comes to the inner corner side bent in the shape of a dogleg, but the central part in the height direction of the bent oblique line 16 is fixed to the anchor line 9 fixed at one end in the concrete section of the column 11. By connecting (corresponding to claim 5), transmission of tensile force is achieved.

図13はくの字の斜め筋16を用いた開口部回り補強構造の他の例を示したもので、開口部５を挟むようにその両側にくの字の斜め筋16を配筋し、その高さ方向中央部を、両端にフックを形成したつなぎ筋19で中子筋３につないで、引張力の伝達を図っている。   FIG. 13 shows another example of the reinforcement structure around the opening portion using the diagonal stripes 16 of the cross-section, and the diagonal stripes 16 of the cross-section are arranged on both sides so as to sandwich the opening portion 5. The central portion in the height direction is connected to the core muscle 3 by a connecting muscle 19 having hooks formed at both ends to transmit a tensile force.

この例では、くの字の斜め筋16を図12の(c)に示したようにフープ上に成形しているが、くの字に屈曲させた高さ方向中央を若干ループの内側へ絞り込めば、つなぎ筋19をせん断補強筋４の内側に納めることができる。   In this example, the diagonal stripes 16 are formed on the hoop as shown in Fig. 12 (c), but the center in the height direction bent to the square is slightly narrowed to the inside of the loop. If it puts in, the tether 19 can be stored inside the shear reinforcement 4.

図14は他の実施形態として、開口部５が梁端近傍にある場合において、開口部５と梁端との間だけでなく、開口部５を挟む反対側にもくの字形の斜め筋26を用いた場合である。この場合、両側のくの字形の斜め筋26を一つのリング状のものに置き換えることもでき、上下にフック26ｂとしての金具を固着して、それぞれ一方を上端主筋２に、他方を下端主筋３に係合させればよい。なお、開口部５の位置が梁端近傍でない場合にも適用可能である。   FIG. 14 shows another embodiment in which, when the opening 5 is in the vicinity of the beam end, not only between the opening 5 and the beam end, but also on the opposite side across the opening 5, Is used. In this case, the dogleg-shaped diagonal stripes 26 on both sides can be replaced with one ring-shaped one, and metal fittings as hooks 26b are fixed on the upper and lower sides, one on the upper main bar 2 and the other on the lower main bar 3 respectively. Can be engaged. Note that the present invention is also applicable when the position of the opening 5 is not near the beam end.

図15は請求項４の一実施形態にあたるものであり、開口部５と梁端との間に用いられる斜め筋として、高さ方向中央部で屈曲させたくの字形の斜め筋36の一端にフック（立面には表れていない）が形成されたものを、２本一組で互いにフックが反対側の端部にくるように重ね合わせて用い、一方の斜め筋36のフックを上端主筋２に係合し、他方の斜め筋36のフックを下端主筋３に係合させている。   FIG. 15 shows an embodiment of the fourth aspect of the present invention. As an oblique line used between the opening 5 and the beam end, a hook is attached to one end of a dog-shaped oblique line 36 bent at the center in the height direction. (One that does not appear on the elevation) is used in a pair so that the hooks come to the opposite ends of each other, and the hook of one diagonal line 36 is used as the upper main line 2 The hooks of the other oblique muscle 36 are engaged with the lower end main reinforcement 3.

また、これら斜め筋36、36の高さ方向中央部を、図11の例のように一端が柱断面内に定着されるアンカー筋９につないでいる（請求項５に対応）。２本一組で用いたくの字形の斜め筋36、36は6重ね合わせ部分が重ね継手として機能する。   Further, the central part in the height direction of the oblique lines 36, 36 is connected to an anchor line 9 whose one end is fixed in the column cross section as in the example of FIG. 11 (corresponding to claim 5). Six overlapping portions of the angled diagonal stripes 36, 36 used as a pair function as a lap joint.

図16は請求項６の一実施形態にあたるものであり、開口部の外側を取り巻く二重のリング筋48、49とリング筋48、49の上下に延びる複数本の斜め筋46及び縦筋47を組み合わせてなる補強筋41を用いている。   FIG. 16 corresponds to an embodiment of claim 6 and includes double ring bars 48 and 49 surrounding the outside of the opening and a plurality of oblique bars 46 and vertical bars 47 extending above and below the ring bars 48 and 49. A reinforcing bar 41 is used in combination.

上方へ延びる斜め筋46及び縦筋47のフック（立面には表れていない）を上端主筋２に係合し、下方へ延びる斜め筋46及び縦筋47のフックを下端主筋３に係合することで、これらの主筋２，３との間での十分な引張力の伝達が行われるようにしている。   The hooks of diagonal lines 46 and vertical bars 47 (not shown in the vertical plane) extending upward are engaged with the upper main muscle 2, and the hooks of diagonal lines 46 and vertical bars 47 extending downward are engaged with the lower main bar 3. Thus, a sufficient tensile force is transmitted between these main bars 2 and 3.

開口部回りにおける主筋と斜め筋の関係を示した斜視図である。It is the perspective view which showed the relationship between the principal muscle and the diagonal muscle around an opening part. 斜め筋の配筋状態を示した梁の立面図である。It is the elevation view of the beam which showed the reinforcement arrangement | positioning state of an oblique line. 梁の鉛直面の片側につき、Ｃ字形の一組の斜め筋を互いに平行に配筋した場合を示した図２のｘ−ｘ線断面図である。FIG. 3 is a cross-sectional view taken along the line xx of FIG. 2 showing a case where a pair of oblique stripes of a C shape are arranged in parallel with each other on one side of a vertical plane of the beam. 梁の鉛直面の片側につき、Ｃ字形の一組の斜め筋を互いに交差させて配筋した場合を示した図２のｘ−ｘ線断面図である。FIG. 3 is a cross-sectional view taken along the line xx of FIG. 2 showing a case where a set of diagonal stripes of a C shape is crossed with each other on one side of a vertical plane of the beam. 梁の鉛直面の片側につき、Ｓ字形の一組の斜め筋を互いに平行に配筋した場合を示した図２のｘ−ｘ線断面図である。FIG. 3 is a cross-sectional view taken along line xx of FIG. 2 showing a case where a set of diagonal S-shaped bars are arranged in parallel to each other on one side of the vertical plane of the beam. 梁の鉛直面の片側につき、Ｓ字形の一組の斜め筋を互いに非平行に配筋した場合を示した図２のｘ−ｘ線断面図である。FIG. 3 is a cross-sectional view taken along line xx of FIG. 2 illustrating a case where a set of S-shaped diagonal stripes are arranged non-parallel to each other on one side of the vertical plane of the beam. 梁の鉛直面の片側につき、Ｓ字形の一組の斜め筋を互いに交差させて配筋した場合を示した図２のｘ−ｘ線断面図である。FIG. 3 is a cross-sectional view taken along the line xx of FIG. 2 showing a case where a set of diagonal stripes of an S shape are crossed with each other on one side of a vertical plane of a beam. 梁の鉛直面の片側につき、Ｓ字形の一組の斜め筋を互いに交差させて配筋した他の場合を示した図２のｘ−ｘ線断面図である。FIG. 9 is a cross-sectional view taken along line xx of FIG. 2 showing another case where a set of diagonal stripes of an S shape are crossed with each other on one side of the vertical plane of the beam. 梁に作用するせん断力に対し、斜め筋が上端主筋とせん断補強筋、及びコンクリートと共にトラス機構を形成する様子を示した立面図である。It is the elevation which showed a mode that a diagonal line | wire forms a truss mechanism with a top main reinforcement, a shear reinforcement bar, and concrete with respect to the shear force which acts on a beam. 梁端近傍の開口部回り補強構造の一例を示した立面図である。It is the elevation which showed an example of the reinforcement structure around the opening part of the beam end vicinity. 梁端近傍の開口部回り補強構造の他の例を示した立面図である。It is the elevation which showed the other example of the reinforcement structure around the opening part of the beam end vicinity. くの字の斜め筋を用いた梁端近傍の開口部回り補強構造の一例を示した立面図である。It is the elevation which showed an example of the reinforcement structure around an opening part near the end of a beam using the oblique line of the character of the character. (a)はくの字の斜め筋を用いた開口部回り補強構造の例を示した立面図、(b)は縦断面図、(c)はくの字の斜め筋を示した斜視図である。(a) Elevated view showing an example of a reinforcement structure around the opening using a cross-shaped oblique line, (b) is a longitudinal sectional view, (c) a perspective view showing a cross-shaped oblique line It is. 梁端近傍の開口部回り補強構造の他の例を示した立面図である。It is the elevation which showed the other example of the reinforcement structure around the opening part of the beam end vicinity. 梁端近傍の開口部回り補強構造の他の例を示した立面図である。It is the elevation which showed the other example of the reinforcement structure around the opening part of the beam end vicinity. 梁端近傍の開口部回り補強構造の他の例を示した立面図である。It is the elevation which showed the other example of the reinforcement structure around the opening part of the beam end vicinity. (a)は鉄筋を網状に組み立てた補強金物によって開口部回りを補強する従来方法を示した立面図、(b)は縦断面図である。(a) is an elevational view showing a conventional method for reinforcing the periphery of the opening by a reinforcing metal piece in which reinforcing bars are assembled in a net-like shape, and (b) is a longitudinal sectional view. (a)は斜め筋によって開口部回りを補強する従来方法を示した立面図、(b)は縦断面図である。(a) is an elevational view showing a conventional method for reinforcing the periphery of the opening by oblique stripes, and (b) is a longitudinal sectional view. (a)は斜め筋によって開口部回りを補強する他の従来方法を示した立面図、(b)は縦断面図である。(a) is an elevational view showing another conventional method for reinforcing the periphery of the opening by oblique stripes, and (b) is a longitudinal sectional view. (a)は溶接金網によって開口部回りを補強する従来方法を示した立面図、(b)は縦断面図である。(a) is an elevational view showing a conventional method for reinforcing the periphery of the opening with a welded wire mesh, and (b) is a longitudinal sectional view.

符号の説明Explanation of symbols

１…梁、２…上端主筋、３…下端主筋、４…せん断補強筋、５…開口部、６…斜め筋、6a…フック、７…スリーブ、８…アンカー筋、９…アンカー筋、11…柱、16…くの字の斜め筋、17…開口際補強筋、18…中子筋、19…つなぎ筋、26…くの字の斜め筋、26b…フック、36…くの字の斜め筋、41…補強筋、46…斜め筋、47…縦筋、48…リング筋、49…リング筋   DESCRIPTION OF SYMBOLS 1 ... Beam, 2 ... Top main bar, 3 ... Bottom main bar, 4 ... Shear reinforcement bar, 5 ... Opening, 6 ... Diagonal bar, 6a ... Hook, 7 ... Sleeve, 8 ... Anchor bar, 9 ... Anchor bar, 11 ... Pillar, 16 ... Diagonal muscle of 17, 17 ... Reinforcing bar, 18 ... Core, 19 ... Continuation, 26 ... Diagonal, 26b ... Hook, 36 ... Diagonal , 41 ... Reinforcing bars, 46 ... Diagonal bars, 47 ... Longitudinal bars, 48 ... Ring bars, 49 ... Ring bars

Claims (6)

上端主筋及び下端主筋とせん断補強筋が配筋された鉄筋コンクリート造の梁に幅方向に貫通して形成される開口部の回りを、前記主筋に対し、傾斜して配筋される複数本の斜め筋を用いて補強した補強構造であり、前記斜め筋は両端にフックが形成された形をし、２本で一組となり、互いに交差して配筋され、各斜め筋は一方のフックにおいて上端主筋に係合し、他方のフックにおいて下端主筋に係合している鉄筋コンクリート梁における開口部回りの補強構造。   A plurality of slanted bars arranged at an angle with respect to the main bar around the opening formed through the reinforced concrete beam with the upper and lower main bars and shear reinforcement bars penetrating in the width direction It is a reinforcing structure reinforced with a streak, and the diagonal streaks are formed with hooks formed at both ends, and a pair of two are arranged and crossed with each other. A reinforcing structure around an opening in a reinforced concrete beam that engages with a main reinforcement and engages with a lower end main reinforcement at the other hook. 一組の斜め筋は梁の図心を含む鉛直面の両側に配置され、その鉛直面の片側につき、開口部を挟んで両側に配置されている請求項１記載の鉄筋コンクリート梁における開口部回りの補強構造。   The pair of diagonal bars are arranged on both sides of a vertical plane including the centroid of the beam, and one side of the vertical plane is arranged on both sides of the opening, around the opening in the reinforced concrete beam according to claim 1. Reinforced structure. 上端主筋及び下端主筋とせん断補強筋が配筋された鉄筋コンクリート造の梁に幅方向に貫通して形成される開口部の回りを、前記主筋に対し、傾斜して配筋される複数本の斜め筋を用いて補強した補強構造であり、前記斜め筋のうち、少なくとも前記開口部を挟む一側に配置される斜め筋は高さ方向中央部で屈曲させたくの字形の斜め筋の両端にフックが形成された形をし、一方のフックにおいて上端主筋に係合し、他方のフックにおいて下端主筋に係合している鉄筋コンクリート梁における開口部回りの補強構造。   A plurality of slanted bars arranged at an angle with respect to the main bar around the opening formed through the reinforced concrete beam with the upper and lower main bars and shear reinforcement bars penetrating in the width direction It is a reinforcing structure reinforced by using a streak, and at least one of the oblique streaks arranged on the one side across the opening is hooked to both ends of a crook-shaped oblique streak bent at the center in the height direction. A reinforcing structure around an opening in a reinforced concrete beam that has a shape formed by engaging a top main bar in one hook and a bottom main bar in the other hook. 上端主筋及び下端主筋とせん断補強筋が配筋された鉄筋コンクリート造の梁に幅方向に貫通して形成される開口部の回りを、前記主筋に対し、傾斜して配筋される複数本の斜め筋を用いて補強した補強構造であり、前記斜め筋のうち、少なくとも前記開口部を挟む一側に配置される斜め筋は高さ方向中央部で屈曲させたくの字形の斜め筋の一端にフックが形成された形をし、２本で一組となり、互いにフックが反対側の端部にくるように重ね合わせて配筋され、一方の斜め筋のフックにおいて上端主筋に係合し、他方の斜め筋のフックにおいて下端主筋に係合している鉄筋コンクリート梁における開口部回りの補強構造。   A plurality of slanted bars arranged at an angle with respect to the main bar around the opening formed through the reinforced concrete beam with the upper and lower main bars and shear reinforcement bars penetrating in the width direction It is a reinforcing structure reinforced by using a streak, and at least one of the oblique streaks arranged on the one side across the opening is hooked to one end of a crook-shaped oblique streak bent at the center in the height direction. Is formed, and the two hooks are arranged in a superposed manner so that the hooks are on the opposite ends, and the upper main bar is engaged with the hook of one diagonal line, and the other Reinforcement structure around the opening in a reinforced concrete beam that engages with the main lower end of the diagonal hook. 前記開口部が梁端近傍に形成されている場合において、前記開口部と梁端との間に用いられる前記くの字形の斜め筋の高さ方向中央部を、一端が柱断面内に定着されるアンカー筋につないでいる請求項３または４記載の鉄筋コンクリート梁における開口部回りの補強構造。   In the case where the opening is formed in the vicinity of the beam end, the central portion in the height direction of the dog-shaped oblique line used between the opening and the beam end is fixed in the column cross section. The reinforcing structure around the opening in the reinforced concrete beam according to claim 3 or 4, wherein the reinforcing bar is connected to an anchor bar. 上端主筋及び下端主筋とせん断補強筋が配筋された鉄筋コンクリート造の梁に幅方向に貫通して形成される開口部の回りを、前記開口部の外側を取り巻くリング筋とリング筋の上下に延びる複数本の斜め筋を組み合わせてなる補強筋を用いた補強構造であり、前記斜め筋は端部にフックが形成された形をし、上方へ延びる斜め筋のフックを上端主筋に係合し、下方へ延びる斜め筋のフックを下端主筋に係合している鉄筋コンクリート梁における開口部回りの補強構造。
Extends around the opening formed in the width direction of the reinforced concrete beam with the upper and lower main bars and the shear reinforcement bars, and extends above and below the ring and ring bars surrounding the opening. It is a reinforcing structure using a reinforcing bar formed by combining a plurality of diagonal lines, the diagonal line has a shape in which a hook is formed at an end, and the hook of the diagonal line extending upward is engaged with the upper end main line, A reinforcing structure around an opening in a reinforced concrete beam in which a hook of diagonal bars extending downward is engaged with a bottom main bar.
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JP4893233B2 (en) * 2006-10-27 2012-03-07 株式会社大林組 Reinforced structure of reinforced concrete beam with opening, manufacturing method of reinforced concrete beam with opening, beam structure
JP5341335B2 (en) * 2007-10-04 2013-11-13 株式会社竹中工務店 Corrugated steel shear wall
JP2011043009A (en) * 2009-08-24 2011-03-03 Hazama Corp Reinforcing member around opening in reinforcing concrete beam with opening, and reinforcing structure and method using the same
JP5603667B2 (en) * 2010-06-11 2014-10-08 日本スプライススリーブ株式会社 Reinforcement structure of the opening provided in the joint hardware part
JP2013036186A (en) * 2011-08-05 2013-02-21 Nippon Splice Sleeve Kk Reinforcement structure provided with joint hardware portion and opening hole part arranged side by side
JP5985799B2 (en) * 2011-08-05 2016-09-06 日本スプライススリーブ株式会社 Reinforcement structure with joint metal parts and openings
JP5924903B2 (en) * 2011-10-19 2016-05-25 株式会社長谷工コーポレーション Reinforcement structure around manhole in underground beam
JP6741804B2 (en) * 2018-02-06 2020-08-19 東急建設株式会社 Structure of reinforced concrete beams
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