JP6181369B2 - Reinforcement bracket and reinforced concrete perforated beam provided with the reinforcement bracket - Google Patents

Reinforcement bracket and reinforced concrete perforated beam provided with the reinforcement bracket Download PDF

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JP6181369B2
JP6181369B2 JP2012279649A JP2012279649A JP6181369B2 JP 6181369 B2 JP6181369 B2 JP 6181369B2 JP 2012279649 A JP2012279649 A JP 2012279649A JP 2012279649 A JP2012279649 A JP 2012279649A JP 6181369 B2 JP6181369 B2 JP 6181369B2
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reinforcing bar
reinforcing
auxiliary
metal fitting
bars
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JP2014122504A (en
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雅也 波田
雅也 波田
浩二 森
浩二 森
細矢 博
博 細矢
真 濱田
真 濱田
秀夫 村上
秀夫 村上
治人 五十嵐
治人 五十嵐
政人 玉井
政人 玉井
森 和久
森  和久
延明 平田
延明 平田
雅史 稲生
雅史 稲生
寛 江頭
寛 江頭
真司 大田
真司 大田
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Tobishima Corp
Toa Corp
Kumagai Gumi Co Ltd
Okumura Corp
Sumitomo Mitsui Construction Co Ltd
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Tobishima Corp
Toa Corp
Kumagai Gumi Co Ltd
Okumura Corp
Sumitomo Mitsui Construction Co Ltd
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本発明は、外側補強筋と内側補強筋とを備えて構成され、開口を有する建築物における前記開口の周囲に配される補強金具、および当該補強金具を備えた鉄筋コンクリート有孔梁に関する。   The present invention relates to a reinforcing metal fitting provided with an outer reinforcing bar and an inner reinforcing bar and arranged around the opening in a building having an opening, and a reinforced concrete perforated beam including the reinforcing metal fitting.

鉄筋コンクリート建築物の梁には配管や配線、或いは人通用の貫通孔が設けられる場合があり、そしてこのような有孔梁の貫通孔から発生し得るひび割れ(クラック)、特に斜め剪断力が加わった際の剪断クラックを防止するため、従来から特許文献1〜5に示されるような補強金具が貫通孔周囲に配設されている。
尚、本明細書で記載する「鉄筋コンクリート」の用語は、鉄骨鉄筋コンクリートを含み、コンクリートを鉄筋で補強する全ての構造を含む意味で用いる。
Reinforced concrete building beams may be provided with piping, wiring, or through-holes for personal use, and cracks that can be generated from the through-holes of such perforated beams, in particular, oblique shearing forces are applied. In order to prevent shear cracks at the time, reinforcing metal fittings as shown in Patent Documents 1 to 5 are conventionally provided around the through hole.
The term “reinforced concrete” described in the present specification includes steel reinforced concrete, and is used to include all structures in which concrete is reinforced with reinforcing bars.

特公平8−3236号公報Japanese Patent Publication No. 8-3236 特開2003−20755号公報JP 2003-20755 A 特開2005−180175号公報JP 2005-180175 A 特開2005−320687号公報JP 2005-320687 A 特開2007−162360号公報JP 2007-162360 A

ところで近年では、建築物には従来にも増してより一層の耐震性が求められる様になっており、またその耐震性の意味するところは、建築構造物の損壊などの深刻な事象はもとより、損壊までには至らないがその手前の状態、例えばコンクリートに生じる顕著なクラックなども含まれている。即ち、せん断耐力は高いレベルで維持しながらも、地震によりコンクリートに生じるひび割れの、より一層の抑制が要求される様になっている。   By the way, in recent years, more and more earthquake resistance has been demanded for buildings, and the meaning of the earthquake resistance is not only from serious events such as damage to building structures, Although it does not lead to damage, the state before that, for example, the remarkable crack which arises in concrete is also included. That is, while maintaining the shear strength at a high level, further suppression of cracks generated in concrete due to an earthquake is required.

上述した特許文献1〜5記載の補強金具を用いれば、鉄筋コンクリート有孔梁において貫通孔に生じるひび割れの長さは一定程度抑えることができるものの、上述したような、高いせん断耐力を維持しながらも、地震によりコンクリートに生じるひび割れをより一層抑制したいといった要求には必ずしも充分とは言えなかった。   Although the length of the crack generated in the through hole in the reinforced concrete perforated beam can be suppressed to a certain degree by using the reinforcing metal fittings described in Patent Documents 1 to 5 described above, while maintaining the high shear strength as described above. However, it was not always sufficient for the demand to further suppress cracks generated in concrete due to earthquakes.

また、近年では貫通孔周囲を補強する補強金具を高強度鉄筋により形成することが多くなっている。高強度鉄筋は降伏点が高く、高いせん断耐力を得ることができ、また鉄筋径を小さくできるので軽量化が図られ、施工性も良好である。しかしその反面、貫通孔周囲のひび割れをより一層制限したいという観点においては、高強度鉄筋は径が小さいことから所定荷重に対する伸びが大きくなり、特に径の大きい普通強度鉄筋により形成した補強金具よりもひび割れ制御の点においてむしろ劣ってしまうこととなる。   In recent years, reinforcing metal fittings that reinforce the periphery of the through hole are often formed of high-strength reinforcing bars. High-strength reinforcing bars have a high yield point, can provide high shear strength, and can reduce the diameter of the reinforcing bars, resulting in weight reduction and good workability. However, on the other hand, from the viewpoint of further limiting the cracks around the through-hole, the high-strength rebar has a small diameter, so the elongation for a given load increases. This is rather inferior in terms of crack control.

そしてまたこの様な欠点を補う為に、補強金具を複数用いることも考えられるが、この場合施工性及びコストの観点で好ましくない。   In order to make up for such drawbacks, it may be possible to use a plurality of reinforcing metal fittings. In this case, however, it is not preferable from the viewpoint of workability and cost.

そこで本発明はこの様な状況に鑑みなされたものであり、その目的は、鉄筋コンクリート有孔梁に生じるひび割れをより一層抑制するとともに、製品重量を抑えて施工性にも優れた補強金具、およびこれを備えた鉄筋コンクリート有孔梁を提供することにある。   Accordingly, the present invention has been made in view of such a situation, and an object of the present invention is to further suppress cracks generated in a reinforced concrete perforated beam, and to suppress the product weight and to improve the workability, and this It is in providing a reinforced concrete perforated beam provided with.

上記課題を解決する為の本発明の第1の態様は、環状に形成された外側補強筋と、環状に形成された、前記外側補強筋の内側に配される内側補強筋と、を備えて構成され、開口を有する建築物における前記開口の周囲に配される補強金具であって、環状に形成され、前記内側補強筋の更に内側に位置する鉄筋部分を有する補助補強筋を備えて成ることを特徴とする。   A first aspect of the present invention for solving the above-described problem includes an outer reinforcing bar formed in an annular shape, and an inner reinforcing bar formed in an annular shape and disposed inside the outer reinforcing bar. A reinforcing metal fitting arranged around the opening in a building having an opening, and comprising an auxiliary reinforcing bar formed in an annular shape and having a reinforcing bar portion positioned further inside the inner reinforcing bar. It is characterized by.

本態様によれば、開口を有する建築物における前記開口の周囲に配される補強金具は、環状に形成された外側補強筋およびその内側に配される内側補強筋に加え、内側補強筋の更に内側に位置する鉄筋部分を有する補助補強筋を備えている。従って前記開口周囲の鉄筋量(鉄筋断面積)を増やすことができ、鉄筋の伸びをより一層抑えることができ、より効果的に開口に生じるひび割れを抑制することができる。   According to this aspect, the reinforcing bracket disposed around the opening in the building having the opening includes the outer reinforcing bar formed in an annular shape and the inner reinforcing bar disposed inside thereof, and further includes the inner reinforcing bar. An auxiliary reinforcing bar having a reinforcing bar portion located inside is provided. Therefore, the amount of reinforcing bars (reinforcing bar cross-sectional area) around the opening can be increased, the extension of the reinforcing bar can be further suppressed, and cracks generated in the opening can be more effectively suppressed.

また、地震発生時のひび割れを抑制できることに加え、施工後の乾燥に起因する開口周囲のひび割れの抑制にも寄与することとなる。そして更に、開口に生じるひび割れを抑制する為に複数の補強金具を用いる必要もないので、施工性を低下させず、また顕著なコストアップを回避することもできる。   Moreover, in addition to being able to suppress cracking at the time of the occurrence of an earthquake, it will also contribute to suppression of cracks around the opening caused by drying after construction. Furthermore, since it is not necessary to use a plurality of reinforcing metal fittings in order to suppress cracks generated in the opening, it is possible to avoid a significant increase in cost without deteriorating the workability.

本発明の第2の態様は、第1の態様において、前記補助補強筋は、前記内側補強筋より大径の鉄筋により形成されていることを特徴とする。   According to a second aspect of the present invention, in the first aspect, the auxiliary reinforcing bar is formed of a reinforcing bar having a diameter larger than that of the inner reinforcing bar.

本態様によれば、前記補助補強筋は、前記内側補強筋より大径の鉄筋により形成されているので、前記開口周囲の鉄筋量(鉄筋断面積)を効果的に増やすことができ、鉄筋の伸びをより一層抑えることができ、より効果的に開口に生じるひび割れを抑制することができる。尚、「大径」とは内側補強筋及び補助補強筋の断面形状を問わず、補助補強筋の断面積が内側補強筋より大きいことを意味する。   According to this aspect, since the auxiliary reinforcing bars are formed by reinforcing bars having a diameter larger than that of the inner reinforcing bars, the amount of reinforcing bars (rebar cross-sectional area) around the opening can be effectively increased. Elongation can be further suppressed, and cracks generated in the opening can be suppressed more effectively. The “large diameter” means that the cross-sectional area of the auxiliary reinforcing bar is larger than the inner reinforcing bar regardless of the cross-sectional shapes of the inner reinforcing bar and the auxiliary reinforcing bar.

本発明の第3の態様は、前記外側補強筋及び前記内側補強筋は、前記補助補強筋より高強度の鉄筋により形成されていることを特徴とする。   The third aspect of the present invention is characterized in that the outer reinforcing bar and the inner reinforcing bar are formed by reinforcing bars having higher strength than the auxiliary reinforcing bar.

本態様によれば、前記外側補強筋及び前記内側補強筋は、前記補助補強筋より高強度の鉄筋により形成されているので、補強金具全体として高いせん断耐力を得ながらも、上述した第1の態様で得られる作用効果、即ち開口に生じるひび割れのより一層の抑制効果、良好な施工性、コストアップの回避、のこれら作用効果を得ることができる。   According to this aspect, since the outer reinforcing bar and the inner reinforcing bar are formed of a reinforcing bar having a strength higher than that of the auxiliary reinforcing bar, the above-described first reinforcing bar is obtained while obtaining a high shear strength as a whole reinforcing bracket. It is possible to obtain the operational effects obtained in the aspect, that is, the further suppression effect of cracks generated in the opening, good workability, and avoidance of cost increase.

本発明の第4の態様は、第1から第3の態様のいずれかにおいて、前記内側補強筋は、前記開口に加わるせん断力の方向に対して直交する四辺を有する略方形の形状を成していることを特徴とする。   According to a fourth aspect of the present invention, in any one of the first to third aspects, the inner reinforcing bar has a substantially square shape having four sides orthogonal to a direction of a shearing force applied to the opening. It is characterized by.

本態様によれば、前記内側補強筋は、前記開口に加わるせん断力の方向に対して直交する四辺を有する略方形の形状を成しているので、前記開口に加わるせん断力に対してより確実に対抗することができる。   According to this aspect, the inner reinforcing bar has a substantially square shape having four sides orthogonal to the direction of the shearing force applied to the opening, and thus more reliably against the shearing force applied to the opening. Can be countered.

本発明の第5の態様は、第4の態様において、前記補助補強筋は、前記内側補強筋より角数が多いとともに、前記せん断力の方向に対して直交する辺を有する多角形、又は、円形を成していることを特徴とする。   According to a fifth aspect of the present invention, in the fourth aspect, the auxiliary reinforcing bar has a polygon having more corners than the inner reinforcing bar and a side perpendicular to the direction of the shear force, or It is characterized by a circular shape.

本態様によれば、前記補助補強筋は、前記内側補強筋より角数が多いとともに、前記せん断力の方向に対して直交する辺を有する多角形、又は、円形を成しているので、前記開口から補助補強筋までの距離を短くすることができ、より効果的に開口に生じるひび割れを抑制することができる。   According to this aspect, the auxiliary reinforcing bar has a polygonal shape having more corners than the inner reinforcing bar and a side perpendicular to the direction of the shear force, or a circular shape. The distance from the opening to the auxiliary reinforcing bar can be shortened, and cracks generated in the opening can be more effectively suppressed.

本発明の第6の態様は、開口を有する建築物における前記開口の周囲に配される補強金具であって、前記貫通孔を囲う様に配置される鉄筋を複数有し、前記複数の鉄筋は、前記貫通孔に近い鉄筋と前記貫通孔から遠い鉄筋とを備えて構成され、前記貫通孔に近い鉄筋は、前記貫通孔から遠い鉄筋より大径であることを特徴とする。   A sixth aspect of the present invention is a reinforcing bracket arranged around the opening in a building having an opening, and has a plurality of reinforcing bars arranged so as to surround the through hole, and the plurality of reinforcing bars are The reinforcing bar is provided with a reinforcing bar close to the through hole and a reinforcing bar far from the through hole, and the reinforcing bar close to the through hole is larger in diameter than the reinforcing bar far from the through hole.

本態様によれば、開口を有する建築物における前記開口の周囲に配される補強金具は、前記貫通孔を囲う様に配置される鉄筋を複数有し、前記複数の鉄筋は、前記貫通孔に近い鉄筋と前記貫通孔から遠い鉄筋とを備えて構成され、前記貫通孔に近い鉄筋は、前記貫通孔から遠い鉄筋より大径であるので、前記開口周囲の鉄筋量(鉄筋断面積)を効果的に増やすことができ、鉄筋の伸びをより一層抑えることができ、より効果的に開口に生じるひび割れを抑制することができる。尚、「大径」とは内側補強筋及び補助補強筋の断面形状を問わず、補助補強筋の断面積が内側補強筋より大きいことを意味する。   According to this aspect, the reinforcing metal fitting arranged around the opening in the building having the opening has a plurality of reinforcing bars arranged so as to surround the through hole, and the plurality of reinforcing bars are arranged in the through hole. The rebar is composed of a close rebar and a rebar far from the through hole, and the rebar close to the through hole has a larger diameter than the rebar far from the through hole, so the amount of rebar around the opening (rebar cross-sectional area) is effective. Thus, the elongation of the reinforcing bars can be further suppressed, and cracks generated in the openings can be suppressed more effectively. The “large diameter” means that the cross-sectional area of the auxiliary reinforcing bar is larger than the inner reinforcing bar regardless of the cross-sectional shapes of the inner reinforcing bar and the auxiliary reinforcing bar.

また、地震発生時のひび割れを抑制できることに加え、施工後の乾燥に起因する開口周囲のひび割れの抑制にも寄与することとなる。そして更に、開口に生じるひび割れを抑制する為に複数の補強金具を用いる必要もないので、施工性を低下させず、また顕著なコストアップを回避することもできる。   Moreover, in addition to being able to suppress cracking at the time of the occurrence of an earthquake, it will also contribute to suppression of cracks around the opening caused by drying after construction. Furthermore, since it is not necessary to use a plurality of reinforcing metal fittings in order to suppress cracks generated in the opening, it is possible to avoid a significant increase in cost without deteriorating the workability.

本発明の第7の態様は、第1から第6の態様のいずれかに係る補強金具を備えた鉄筋コンクリート有孔梁である。本態様によれば、鉄筋コンクリート有孔梁において、上述した第1から第6の態様のいずれかと同様な作用効果を得ることができる。   A seventh aspect of the present invention is a reinforced concrete perforated beam including a reinforcing metal fitting according to any one of the first to sixth aspects. According to this aspect, in the reinforced concrete perforated beam, it is possible to obtain the same effect as any of the first to sixth aspects described above.

本発明の第1実施形態に係る補強金具を用いた梁の正面図。The front view of the beam using the reinforcement metal fitting which concerns on 1st Embodiment of this invention. 本発明の第1実施形態に係る補強金具を用いた梁の断面図。Sectional drawing of the beam using the reinforcement metal fitting which concerns on 1st Embodiment of this invention. 本発明の第1実施形態に係る補強金具とあばら筋との関係を示す図。The figure which shows the relationship between the reinforcement metal fitting and stirrup which concern on 1st Embodiment of this invention. 本発明の第1実施形態に係る補強金具の平面図。The top view of the reinforcement metal fitting which concerns on 1st Embodiment of this invention. 本発明の第2実施形態に係る補強金具の平面図。The top view of the reinforcement metal fitting which concerns on 2nd Embodiment of this invention. 本発明の第3実施形態に係る補強金具の平面図。The top view of the reinforcement metal fitting which concerns on 3rd Embodiment of this invention.

以下、図面を参照しながら本発明の実施形態について説明する。尚、各図において共通する構成には同一の符号を付し、重複する説明は避けることとする。
先ず、図1〜図4を参照しながら本発明の第1実施形態について説明する。図1は本発明の第1実施形態に係る補強金具1を用いた梁の正面図、図2は同断面図、図3は補強金具1とこれを取り付けるあばら筋との関係を示す図、図4は補強金具1の平面図である。尚、図2は主として主筋15、あばら筋17、補強金具1、のこれらの関係を示すものであり、図面の煩雑化を避ける為にハッチングは省略している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same structure in each figure, and the overlapping description will be avoided.
First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a beam using a reinforcing metal fitting 1 according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. 3 is a diagram showing the relationship between the reinforcing metal fitting 1 and a stirrup to which the reinforcing metal fitting is attached. 4 is a plan view of the reinforcing metal fitting 1. FIG. 2 mainly shows the relationship between the main bar 15, the stirrup bar 17, and the reinforcing metal fitting 1, and hatching is omitted to avoid complication of the drawing.

図1、図2にはコンクリート梁・床構造が示されている。このコンクリート梁・床構造は、鉄筋コンクリート有孔梁11と床10とが一体的に形成されて図2に示す様に断面略T字形状を成している。梁11において符号12は鉄筋コンクリート有孔梁11の厚み方向(図1において紙面表裏方向、図2において左右方向)に貫通する貫通孔を示しており、この貫通孔12により梁11の幅方向両側に開口が形成された状態となっている。尚、この貫通孔12は、図3に示されるスリーブ13を利用して形成される。   1 and 2 show concrete beam / floor structures. In this concrete beam / floor structure, a reinforced concrete perforated beam 11 and a floor 10 are integrally formed to have a substantially T-shaped cross section as shown in FIG. In the beam 11, reference numeral 12 indicates a through-hole penetrating in the thickness direction of the reinforced concrete perforated beam 11 (the front and back direction in FIG. 1 and the left-right direction in FIG. 2). An opening is formed. The through hole 12 is formed using a sleeve 13 shown in FIG.

本発明に係る補強金具1は、環状に形成された外側補強筋2と、同じく環状に形成された、外側補強筋2の内側に配される内側補強筋3と、同じく環状に形成され、内側補強筋3の更に内側に位置する鉄筋部分を有する補助補強筋4と、を備えて構成され、貫通孔(開口)12の周囲に配される補強金具である。尚、この補強金具1の構成については後に改めて詳しく説明する。   A reinforcing metal fitting 1 according to the present invention includes an outer reinforcing bar 2 formed in an annular shape, an inner reinforcing bar 3 disposed in the outer reinforcing bar 2 and also formed in an annular shape, and also formed in an annular shape. The reinforcing reinforcement 4 is provided with an auxiliary reinforcing bar 4 having a reinforcing bar portion located further inside the reinforcing bar 3, and is a reinforcing metal fitting disposed around the through hole (opening) 12. The configuration of the reinforcing metal fitting 1 will be described in detail later.

図2、図3において符号15は、梁11の長手方向(図2において紙面表裏方向、図3において左右方向)に配筋される主筋を示している。主筋15は、図示するように梁11の幅方向(図2において左右方向)に適宜の間隔を空けて配筋され、更に梁11の高さ方向(図2、図3において上下方向)に適宜の間隔を空けて配筋され、そのうちの一部は床10の領域に配置されている。   2 and 3, reference numeral 15 indicates a main bar arranged in the longitudinal direction of the beam 11 (the front and back direction in FIG. 2 and the left and right direction in FIG. 3). As shown in the figure, the main bars 15 are arranged with an appropriate interval in the width direction of the beam 11 (left and right direction in FIG. 2), and further in the height direction of the beam 11 (up and down direction in FIGS. 2 and 3). The bars are arranged with an interval of a part of them, and some of them are arranged in the area of the floor 10.

また、符号16、17は主筋15に係回されるせん断補強筋(フープ筋或いはあばら筋とも言われる)を示している。このせん断補強筋16、17は、図3に示す様に梁11の長手方向(図3において左右方向)に適宜の間隔を空けて多数配筋される。このうち、せん断補強筋17は貫通孔12に近接して配置される孔際あばら筋であり、せん断補強筋16はそれ以外のあばら筋である。また、図3において符号18は、貫通穴12の上下に配される開口上下補強筋である。   Reference numerals 16 and 17 denote shear reinforcement bars (also referred to as hoop bars or ribbed bars) that are engaged with the main bars 15. As shown in FIG. 3, a large number of the shear reinforcement bars 16 and 17 are arranged at an appropriate interval in the longitudinal direction of the beam 11 (left and right direction in FIG. 3). Among these, the shear reinforcing bar 17 is a staggered hole located near the through hole 12, and the shear reinforcing bar 16 is the other staggered bar. In FIG. 3, reference numeral 18 denotes an opening vertical reinforcing bar disposed above and below the through hole 12.

以上の様な配筋構成に対し、補強金具1は、例えば図2に示す様に貫通孔12の両端開口部に配される。具体的には、例えば主筋15に対して結束固定される。そしてその上でコンクリート打ちがなされ、鉄筋コンクリート有孔梁・床構造が構築される。   With respect to the bar arrangement as described above, the reinforcing metal fitting 1 is arranged at both end openings of the through hole 12 as shown in FIG. Specifically, for example, it is bound and fixed to the main muscle 15. The concrete is then cast on it, and a reinforced concrete perforated beam / floor structure is constructed.

続いて図4以降をも参照しつつ、補強金具1の構成について詳述する。補強金具1において、各補強筋は鉄筋の折り曲げにより形成されており、本実施形態において外側補強筋2と内側補強筋3は、それぞれ個別に形成された上で内側補強筋3の角部(外側補強筋2との接触部)において溶接固定されている。但し、本発明はこれに限定される訳ではなく、外側補強筋2と内側補強筋3とが一筆書きの要領で1本の鉄筋により形成されていても構わない。   Next, the configuration of the reinforcing metal fitting 1 will be described in detail with reference to FIG. In the reinforcing metal fitting 1, each reinforcing bar is formed by bending a reinforcing bar, and in this embodiment, the outer reinforcing bar 2 and the inner reinforcing bar 3 are formed individually and then the corners (outer side) of the inner reinforcing bar 3 are formed. It is fixed by welding at a contact portion with the reinforcing bar 2). However, the present invention is not limited to this, and the outer reinforcing bar 2 and the inner reinforcing bar 3 may be formed by a single reinforcing bar in the manner of one-stroke writing.

外側補強筋2は、その一端部と他端部が中心部に向かって折り曲げられており、そして折り曲げられたその終端部にエンドキャップ5が取り付けられて、スリーブ13を受ける(支持する)スリーブ受けとして機能する様に形成されている。尚、エンドキャップ5やこれを取り付けるための(外側補強筋2の)折り曲げ部分は省略しても構わない。   One end and the other end of the outer reinforcing bar 2 are bent toward the center, and an end cap 5 is attached to the bent end of the outer reinforcing bar 2 to receive (support) the sleeve 13. It is formed to function as. Note that the end cap 5 and the bent portion (of the outer reinforcing bar 2) for attaching the end cap 5 may be omitted.

内側補強筋3の更に内側に配される補助補強筋4は、鉄筋の折り曲げにより形成された上で、本実施形態では内側補強筋3に対し溶接固定されている。尚、補助補強筋4の内側補強筋3に対する固定は、工場(鉄筋コンクリート梁・床構造の施工現場以外)において事前に行われても良いし、或いは鉄筋コンクリート梁・床構造の施工現場において行われても良い。   The auxiliary reinforcing bar 4 disposed further inside the inner reinforcing bar 3 is formed by bending a reinforcing bar, and in this embodiment is fixed to the inner reinforcing bar 3 by welding. The auxiliary reinforcing bar 4 may be fixed to the inner reinforcing bar 3 in advance in a factory (other than the construction site of the reinforced concrete beam / floor structure) or at the construction site of the reinforced concrete beam / floor structure. Also good.

前者であれば、工場において補強金具1が完成し、そして完成品として施工現場に搬入されるので、施工現場での工程(補助補強筋4の内側補強筋3に対する固定)が不要となり施工現場での施工時間を短縮することができる。また、後者であれば外側補強筋2と内側補強筋3からなる金具と、補助補強筋4と、のこれらを施工現場において別々に扱うことができるので、軽量化によって施工現場における施工性が向上する。   If it is the former, the reinforcing bracket 1 is completed at the factory and is carried to the construction site as a finished product, so the process at the construction site (fixing of the auxiliary reinforcing bar 4 to the inner reinforcing bar 3) becomes unnecessary, and at the construction site. The construction time can be shortened. Moreover, if it is the latter, since the metal fittings which consist of the outer reinforcement bar 2 and the inner reinforcement bar 3, and the auxiliary reinforcement bar 4 can be handled separately in a construction site, the workability in a construction site improves by weight reduction. To do.

尚、補助補強筋4を内側補強筋3に対し接続固定することは必ずしも必須ではない。例えば、補助補強筋4を内側補強筋3に対し接続固定せず、図3に示すせん断補強筋17に対して固定するのみであっても構わない。   It is not always essential to connect and fix the auxiliary reinforcing bars 4 to the inner reinforcing bars 3. For example, the auxiliary reinforcing bar 4 may not be connected and fixed to the inner reinforcing bar 3 but only fixed to the shear reinforcing bar 17 shown in FIG.

以下、外側補強筋2、内側補強筋3、補助補強筋4、のこれらについて図4を参照しつつ更に詳述する。外側補強筋2は、八つの辺(2a〜2h)を備えた略八角形の形状を成しており、隣り合う二辺が約45°の角度を成す様に形成されている。そして補強金具1が梁11に取り付けられた際、辺2a、2c、2e、2g、のこれら四辺は、梁11の長手方向に対して約45°の角度を成す。また、辺2d、2hの二辺は、梁11の長手方向に対し略平行となり、辺2b、2fの2辺は、梁11の高さ方向に対し略平行となる。   Hereinafter, the outer reinforcing bar 2, the inner reinforcing bar 3, and the auxiliary reinforcing bar 4 will be described in more detail with reference to FIG. The outer reinforcing bar 2 has a substantially octagonal shape with eight sides (2a to 2h), and is formed such that two adjacent sides form an angle of about 45 °. When the reinforcing metal fitting 1 is attached to the beam 11, these four sides of the sides 2 a, 2 c, 2 e and 2 g form an angle of about 45 ° with respect to the longitudinal direction of the beam 11. The two sides 2d and 2h are substantially parallel to the longitudinal direction of the beam 11, and the two sides 2b and 2f are substantially parallel to the height direction of the beam 11.

内側補強筋3は、4つの辺(3a〜3d)を備えた略正方形の形状を成しており、隣り合う二辺が約90°の角度を成す様に形成されている。そして補強金具1が梁11に取り付けられた際、各辺3a〜3dは、梁11の長手方向に対して約45°の角度を成す。   The inner reinforcing bar 3 has a substantially square shape having four sides (3a to 3d), and is formed such that two adjacent sides form an angle of about 90 °. When the reinforcing metal fitting 1 is attached to the beam 11, the sides 3 a to 3 d form an angle of about 45 ° with respect to the longitudinal direction of the beam 11.

補助補強筋4は、八つの辺(4a〜4h)を備えた略八角形の形状を成しており、隣り合う二辺が約45°の角度を成す様に形成されている。そして補強金具1が梁11に取り付けられた際、辺4a、4c、4e、4g、のこれら四辺は、梁11の長手方向に対して約45°の角度を成す。また、辺4d、4hの二辺は、梁11の長手方向に対し略平行となり、辺4b、4fの2辺は、梁11の高さ方向に対し略平行となる。   The auxiliary reinforcing bars 4 have a substantially octagonal shape with eight sides (4a to 4h), and are formed so that two adjacent sides form an angle of about 45 °. When the reinforcing metal fitting 1 is attached to the beam 11, these four sides of the sides 4 a, 4 c, 4 e, and 4 g form an angle of about 45 ° with respect to the longitudinal direction of the beam 11. The two sides 4d and 4h are substantially parallel to the longitudinal direction of the beam 11, and the two sides 4b and 4f are substantially parallel to the height direction of the beam 11.

本実施形態では、補助補強筋4を構成する鉄筋部分のうち、45°の角度を成す辺4a、4c、4e、4gが、それぞれ内側補強筋3を構成する鉄筋部分のうち同じく45°の角度を成す辺3a、3b、3c、3dに重なっており、そして溶接固定された状態となっている。   In this embodiment, among the reinforcing bar portions constituting the auxiliary reinforcing bars 4, the sides 4 a, 4 c, 4 e, and 4 g forming an angle of 45 ° are respectively the same 45 ° angle of the reinforcing bar parts constituting the inner reinforcing bar 3. Are overlapped with the sides 3a, 3b, 3c, and 3d, and are fixed by welding.

ここで、補助補強筋4は、内側補強筋3よりも大径の鉄筋により形成されている。一実施例として、外側補強筋2及び内側補強筋3を呼び名16(公称直径15.9mm、公称断面積1.986cm^2)の高強度異形鉄筋により形成し、補助補強筋4を呼び名19(公称直径19.1mm、公称断面積2.865cm^2)の普通強度異形鉄筋により形成する。尚、上記実施例において高強度鉄筋は降伏点785N/mm^2のものであり、普通強度鉄筋は降伏点345N/mm^2のものである。尚、普通強度鉄筋の規格はJIS G 3112による。   Here, the auxiliary reinforcing bars 4 are formed by reinforcing bars having a diameter larger than that of the inner reinforcing bars 3. As an example, the outer reinforcing bar 2 and the inner reinforcing bar 3 are formed of high-strength deformed reinforcing bars having a nominal name 16 (nominal diameter 15.9 mm, nominal cross-sectional area 1.986 cm 2), and the auxiliary reinforcing bars 4 are named 19 ( It is made of ordinary strength deformed reinforcing bars with a nominal diameter of 19.1 mm and a nominal cross-sectional area of 2.865 cm ^ 2. In the above embodiment, the high strength reinforcing bar has a yield point of 785 N / mm ^ 2, and the normal strength reinforcing bar has a yield point of 345 N / mm ^ 2. In addition, the standard of normal strength rebar is based on JIS G 3112.

そして、補助補強筋4を構成する全ての辺4a〜4hが、内側補強筋3の更に内側に位置し(内側補強筋3より内側に迫り出し)、貫通穴12に近い鉄筋部分を構成した状態となっている。尚、補助補強筋4を構成する全ての辺4a〜4hが、内側補強筋3の更に内側に位置する形態のほか、補助補強筋4を構成する一部の辺が、内側補強筋3の更に内側に位置する形態としても良い。   And all sides 4a-4h which constitute auxiliary reinforcing bar 4 are located in the inner side of inner side reinforcing bar 3 (protruded inward from inner side reinforcing bar 3), and constituted the reinforcing bar part near penetration hole 12 It has become. In addition to the form in which all the sides 4 a to 4 h constituting the auxiliary reinforcing bar 4 are positioned further inside the inner reinforcing bar 3, some of the sides constituting the auxiliary reinforcing bar 4 further extend from the inner reinforcing bar 3. It is good also as a form located inside.

以上の構成を備えた補強金具1において、梁11の長さ方向に対し略45°の角度に交差する鉄筋、具体的には、外側補強筋2を構成する辺2a、2c、2e、2gと、内側補強筋3を構成する辺3a〜3dと、補助補強筋4を構成する辺4a、4c、4e、4g、のこれらが、梁11の長さ方向に引っ張り力又は圧縮力が加わった際に生じるせん断力(梁11の長さ方向に対し45°の角度をなす方向に作用)に対し直交するので、この様なせん断力に効果的に対抗することができ、せん断クラックC(図4において一例を示す)の拡がりを抑えることができる。   In the reinforcing metal fitting 1 having the above configuration, the reinforcing bars intersecting at an angle of about 45 ° with respect to the length direction of the beam 11, specifically, the sides 2 a, 2 c, 2 e, 2 g constituting the outer reinforcing bars 2, When the tensile force or the compressive force is applied in the length direction of the beam 11 of the sides 3a to 3d constituting the inner reinforcing bar 3 and the sides 4a, 4c, 4e, and 4g constituting the auxiliary reinforcing bar 4 Is perpendicular to the shearing force generated in the beam 11 (acting in a direction that forms an angle of 45 ° with respect to the length direction of the beam 11). Can be prevented from spreading).

しかも、この様なせん断クラックCの拡がりを抑える各片(外側補強筋2、内側補強筋3、補助補強筋4、の各辺)は単独で存在する訳では無く環状に形成された各補強筋の辺であり、即ち各片は結合されているので、その結合効果によってより効果的にせん断力に対抗することができる。   In addition, each piece (each side of the outer reinforcing bar 2, the inner reinforcing bar 3, and the auxiliary reinforcing bar 4) that suppresses the spread of the shear crack C does not exist independently, but each reinforcing bar formed in an annular shape. That is, since each piece is joined, the joint effect can more effectively counter the shearing force.

また、補助補強筋4により、貫通孔12から内側補強筋3までの距離を短くすることができる。特に、補助補強筋4(本実施形態では略八角形)を内側補強筋3(本実施形態では略四角形)よりも角数の多い形状で形成することで、貫通孔12から内側補強筋3までの距離を効果的に短くすることができる。これにより、例えば施工後のひび割れ(図4において符号Dで示す様なひび割れ)の拡がりを効果的に抑制することができる。   Further, the distance from the through hole 12 to the inner reinforcing bar 3 can be shortened by the auxiliary reinforcing bar 4. In particular, the auxiliary reinforcing bars 4 (substantially octagonal in the present embodiment) are formed in a shape having more corners than the inner reinforcing bars 3 (substantially quadrilateral in the present embodiment), so that the through holes 12 to the inner reinforcing bars 3 are formed. Can be effectively shortened. Thereby, for example, it is possible to effectively suppress the spread of cracks after construction (cracks as indicated by symbol D in FIG. 4).

そして本発明に係る補強金具1では、補助補強筋4は、外側補強筋2及び内側補強筋3より大径の鉄筋により形成されている。従って開口(貫通孔12)周囲の鉄筋量(断面積)を効果的に増やすことができ、せん断力に対する鉄筋の伸びをより一層抑えることができ、より効果的にひび割れ(図4において符号Cで示すひび割れ)を抑制することができる。   In the reinforcing metal fitting 1 according to the present invention, the auxiliary reinforcing bars 4 are formed by reinforcing bars having a diameter larger than that of the outer reinforcing bars 2 and the inner reinforcing bars 3. Therefore, the amount of reinforcing bars (cross-sectional area) around the opening (through hole 12) can be effectively increased, and the extension of the reinforcing bars to the shearing force can be further suppressed. (Cracking shown) can be suppressed.

即ち、鉄筋コンクリート有孔梁11のせん断耐力を向上させる観点においては鉄筋の降伏点を高める必要がある一方で、他方、降伏点にまで至らないダメージ(例えば中地震発生時)を受けた場合の、ひび割れ幅抑制の観点では、鉄筋の伸び量を抑える必要があり、より具体的には鉄筋の断面積が重要となる。鉄筋の伸び量を支配するヤング率は、鉄筋の降伏強度に拘わらず一定であり、伸び量は断面積に支配されるからである。   That is, from the viewpoint of improving the shear strength of the reinforced concrete perforated beam 11, it is necessary to increase the yield point of the reinforcing bar, but on the other hand, when receiving damage that does not reach the yield point (for example, when a middle earthquake occurs) From the viewpoint of suppressing the crack width, it is necessary to suppress the amount of elongation of the reinforcing bar, and more specifically, the cross-sectional area of the reinforcing bar is important. This is because the Young's modulus governing the elongation of the reinforcing bar is constant regardless of the yield strength of the reinforcing bar, and the elongation is governed by the cross-sectional area.

そこで本発明では、内側補強筋3の更に内側に配する補助補強筋4として、内側補強筋3より大径のものを用いた。これにより、上述の通り貫通孔12周囲の鉄筋の断面積を効果的に増やすことができ、せん断力に対する鉄筋の伸びをより一層抑えることができ、より効果的にひび割れを抑制することが可能となる。尚、「大径」とは内側補強筋3及び補助補強筋4の断面形状を問わず、補助補強筋4の断面積が内側補強筋3より大きいことを意味する。   Therefore, in the present invention, the auxiliary reinforcing bar 4 disposed further inside the inner side reinforcing bar 3 has a diameter larger than that of the inner side reinforcing bar 3. As a result, the cross-sectional area of the reinforcing bars around the through-hole 12 can be effectively increased as described above, and the extension of the reinforcing bars to the shearing force can be further suppressed, and cracks can be more effectively suppressed. Become. The “large diameter” means that the cross-sectional area of the auxiliary reinforcing bar 4 is larger than that of the inner reinforcing bar 3 regardless of the cross-sectional shapes of the inner reinforcing bar 3 and the auxiliary reinforcing bar 4.

しかも外側補強筋2と内側補強筋3は高強度鉄筋であるので、補強金具1全体として高いせん断耐力を得ながらも、上記の通り地震発生時のひび割れを効果的に抑制することができる。そしてまた、貫通孔12の周囲に生じるひび割れを抑制する為に複数の補強金具を用いる必要もないので、良好な施工性とコストアップの防止とを両立させることができる。但し、外側補強筋2と内側補強筋3に、普通強度鉄筋を用いても、これらより大径の鉄筋で構成される補助補強筋4による上記作用効果は得ることができる。   Moreover, since the outer reinforcing bar 2 and the inner reinforcing bar 3 are high-strength reinforcing bars, cracks at the time of the occurrence of an earthquake can be effectively suppressed as described above while obtaining high shear strength as the entire reinforcing metal fitting 1. In addition, since it is not necessary to use a plurality of reinforcing metal fittings in order to suppress cracks generated around the through-hole 12, both good workability and prevention of cost increase can be achieved. However, even if normal strength reinforcing bars are used for the outer reinforcing bars 2 and the inner reinforcing bars 3, the above-described effects of the auxiliary reinforcing bars 4 composed of reinforcing bars having a diameter larger than these can be obtained.

以上説明した各実施形態は一例であり、種々の変形が可能であることは言うまでもない。例えば、補助補強筋4は上述した実施形態において外側補強筋2及び内側補強筋3より大径のものを使用したが、これに限らず、同径のものや小径のものを用いても良い。即ち、補助補強筋4を構成する辺のうち少なくとも一辺が、内側補強筋3より更に内側に位置すれば(迫り出していれば)良い。また、補助補強筋4を構成する辺と内側補強筋3を構成する辺とを必ずしも重ね合わせる必要はなく、図5に示す補強金具1Aの如く、補助補強筋4Aを内側補強筋3の完全に内側に配しても良い。   Each embodiment described above is an example, and it goes without saying that various modifications are possible. For example, although the auxiliary reinforcing bars 4 having a larger diameter than the outer reinforcing bars 2 and the inner reinforcing bars 3 are used in the above-described embodiment, the auxiliary reinforcing bars 4 are not limited thereto, and those having the same diameter or a smaller diameter may be used. In other words, it is only necessary that at least one side of the sides constituting the auxiliary reinforcing bar 4 is located further inside than the inner side reinforcing bar 3 (if it protrudes). Further, it is not always necessary to overlap the side that constitutes the auxiliary reinforcing bar 4 and the side that constitutes the inner side reinforcing bar 3, and the auxiliary reinforcing bar 4 </ b> A is completely connected to the inner side reinforcing bar 3 like the reinforcing metal fitting 1 </ b> A shown in FIG. 5. It may be placed inside.

また、他の形態として、補助補強筋4は多角形では無く円形を成す様に形成することもできる。図5に示す補強金具1Bは、円形状を成す補助補強筋4Bを備えた補強金具である。この様な補強金具1’においても、既に説明した補強金具1と同様の作用効果を得ることができる。   As another form, the auxiliary reinforcing bars 4 can be formed in a circular shape instead of a polygonal shape. The reinforcing metal fitting 1B shown in FIG. 5 is a reinforcing metal fitting provided with a circular auxiliary reinforcing bar 4B. Also in such a reinforcing metal fitting 1 ', the same effect as that of the reinforcing metal fitting 1 already described can be obtained.

また、図2において補助補強筋4は外側補強筋2及び内側補強筋3より外側(開口外側)に配置されているが、これに限られず外側補強筋2及び内側補強筋3より内側に配置されていても良い。   In FIG. 2, the auxiliary reinforcing bars 4 are disposed outside (opening outside) the outer reinforcing bars 2 and the inner reinforcing bars 3, but are not limited thereto, and are disposed inside the outer reinforcing bars 2 and the inner reinforcing bars 3. May be.

また、補強金具1を構成する鉄筋は、本実施形態の如く3つに限らず、更に複数の鉄筋で構成しても良い。即ち、補強金具1を構成する鉄筋の数に拘わらず、貫通孔12に近い鉄筋と貫通孔12から遠い鉄筋とを備えた構成において、貫通孔12に近い鉄筋が貫通孔12から遠い鉄筋より大径であれば、上述した本発明の作用効果を得ることが可能となる。   Further, the number of reinforcing bars constituting the reinforcing metal fitting 1 is not limited to three as in the present embodiment, and may be constituted by a plurality of reinforcing bars. That is, regardless of the number of reinforcing bars constituting the reinforcing metal fitting 1, the reinforcing bar close to the through hole 12 is larger than the reinforcing bar far from the through hole 12 in the configuration including the reinforcing bar close to the through hole 12 and the reinforcing bar far from the through hole 12. If it is a diameter, it becomes possible to obtain the above-mentioned operational effects of the present invention.

1、1A、1B、1C 補強金具
2 外側補強筋
3 内側補強筋
4、4A、4B、4C 補助補強筋
5 エンドキャップ(スリーブ受け)
10 床スラブ
11 鉄筋コンクリート有孔梁
12 貫通孔
13 スリーブ
15 主筋
16 一般部あばら筋
17 孔際あばら筋
18 開口上下補強筋
1, 1A, 1B, 1C Reinforcing bracket 2 Outer reinforcing bar 3 Inner reinforcing bar 4, 4A, 4B, 4C Auxiliary reinforcing bar 5 End cap (sleeve holder)
DESCRIPTION OF SYMBOLS 10 Floor slab 11 Reinforced concrete perforated beam 12 Through-hole 13 Sleeve 15 Main reinforcement 16 General part stirrup 17 Perforation stirrup 18 Opening vertical reinforcement

Claims (4)

環状に形成された外側補強筋と、
環状に形成された、前記外側補強筋の内側に配される内側補強筋と、を備えて構成され、開口を有する建築物における前記開口の周囲に配される補強金具であって、
環状に形成され、前記内側補強筋の更に内側に位置する鉄筋部分を有する補助補強筋を備えて成り、
前記補助補強筋は、前記内側補強筋より大径であって前記内側補強筋より荷重を受けた際の伸びが小さい鉄筋により形成され、
前記外側補強筋及び前記内側補強筋は、前記補助補強筋より高強度の鉄筋により形成されている、
ことを特徴とする補強金具。
An outer reinforcing bar formed in an annular shape;
A reinforcing metal fitting arranged around the opening in a building having an opening, the inner reinforcing bar arranged inside the outer reinforcing bar formed in an annular shape,
Is formed annularly, Ri formed an auxiliary reinforcement having a further reinforcement portion positioned inside of the inner reinforcement,
The auxiliary reinforcing bar is formed of a reinforcing bar having a larger diameter than the inner reinforcing bar and having a small elongation when receiving a load from the inner reinforcing bar,
The outer reinforcing bar and the inner reinforcing bar are formed of a reinforcing bar having a strength higher than that of the auxiliary reinforcing bar,
Reinforcing metal fittings characterized by that.
請求項に記載の補強金具において、前記内側補強筋は、前記開口に加わるせん断力の方向に対して直交する四辺を有する略方形の形状を成している、
ことを特徴とする補強金具。
The reinforcing metal fitting according to claim 1 , wherein the inner reinforcing bar has a substantially rectangular shape having four sides orthogonal to a direction of a shearing force applied to the opening.
Reinforcing metal fittings characterized by that.
請求項に記載の補強金具において、前記補助補強筋は、前記内側補強筋より角数が多いとともに、前記せん断力の方向に対して直交する辺を有する多角形、又は、円形を成している、
ことを特徴とする補強金具。
The reinforcing metal fitting according to claim 2 , wherein the auxiliary reinforcing bars have a polygonal shape or a circular shape having more corners than the inner reinforcing bars and a side perpendicular to the direction of the shearing force. Yes,
Reinforcing metal fittings characterized by that.
請求項1から請求項3のいずれか一項に記載の補強金具を備えた鉄筋コンクリート有孔梁。 A reinforced concrete perforated beam comprising the reinforcing metal fitting according to any one of claims 1 to 3 .
JP2012279649A 2012-12-21 2012-12-21 Reinforcement bracket and reinforced concrete perforated beam provided with the reinforcement bracket Active JP6181369B2 (en)

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