JP7032865B2 - Frame joint structure and its construction method, and split prevention muscle - Google Patents

Frame joint structure and its construction method, and split prevention muscle Download PDF

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JP7032865B2
JP7032865B2 JP2017073458A JP2017073458A JP7032865B2 JP 7032865 B2 JP7032865 B2 JP 7032865B2 JP 2017073458 A JP2017073458 A JP 2017073458A JP 2017073458 A JP2017073458 A JP 2017073458A JP 7032865 B2 JP7032865 B2 JP 7032865B2
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skeleton
shear key
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split
existing
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泰行 細井
勝志 渕上
洋 箕尾
秀樹 奥谷
学 小林
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Penta Ocean Construction Co Ltd
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本発明は、耐震補強等のために既存躯体に増設躯体を設置する際に増設躯体を既存躯体に接合する躯体接合構造及びその構築方法、並びに躯体接合構造に用いる割裂防止筋に関する。 The present invention relates to a skeleton joining structure for joining an additional skeleton to an existing skeleton when installing an additional skeleton for seismic retrofitting, a method for constructing the same, and a split prevention muscle used for the skeleton joining structure.

従来、既存躯体に増設躯体を接合する躯体接合構造として特許文献1の接合構造がある。特許文献1の接合構造は、既存躯体と増設躯体との間にシアキーとして棒状のアンカーを設け、アンカーに太径部と細径部を形成し、アンカーの細径部と太径部の一部を既存躯体側に配置し、太径部の残余部分を増設躯体側に配置したものである。この接合構造では、アンカーの細径部と太径部の一部を既存躯体側に配置することで既存躯体の鉄筋と干渉し難くし、既存躯体における施工性を高めている。 Conventionally, there is a joining structure of Patent Document 1 as a skeleton joining structure for joining an additional skeleton to an existing skeleton. In the joint structure of Patent Document 1, a rod-shaped anchor is provided as a shear key between the existing skeleton and the additional skeleton, a large-diameter portion and a small-diameter portion are formed on the anchor, and a small-diameter portion and a part of the large-diameter portion of the anchor. Is placed on the existing skeleton side, and the remaining part of the large diameter portion is placed on the additional skeleton side. In this joint structure, by arranging a part of the small diameter portion and the large diameter portion of the anchor on the existing skeleton side, it is difficult to interfere with the reinforcing bars of the existing skeleton, and the workability in the existing skeleton is improved.

また、別の躯体接合構造として特許文献2の接合構造がある。この接合構造は、既存建物の柱、梁で囲まれた空間における対向面に管体のシアキーを埋設し、その管体がせん断力を受けた時に管体が回転するのを防止するために管体から連結筋を突設させて側圧を低減し、対向する連結筋にわたって鉄筋を配筋して壁を構築するものである。この接合構造では、埋設された管体が面外方向および面内方向の力に対して大きな抵抗となり、壁、柱、梁を強固に接合できると共に、仕上材の上から管体を埋設する穴をコアドリルで形成することにより騒音、振動、粉塵の発生を防止することができるとされている。 Further, as another skeleton joining structure, there is a joining structure of Patent Document 2. In this joint structure, the shear key of the pipe body is embedded in the facing surface in the space surrounded by the pillars and beams of the existing building, and the pipe body is prevented from rotating when the pipe body is subjected to shearing force. The connecting bars are projected from the body to reduce the lateral pressure, and the reinforcing bars are arranged over the facing connecting bars to construct a wall. In this joint structure, the buried pipe body has a large resistance to the force in the out-of-plane direction and the in-plane direction, and the wall, the column, and the beam can be firmly joined, and the hole for burying the pipe body from above the finishing material. It is said that noise, vibration, and dust generation can be prevented by forming the pilaster with a core drill.

特開2016-102400号JP-A-2016-102400 特開2001-317215号JP 2001-317215

ところで、特許文献1のように、コンクリートで形成された増設躯体に棒状のシアキーを配置する躯体接合構造や、特許文献2のように管体のシアキーを配置する躯体接合構造では、シアキーが埋設されている箇所から割り裂く方向に力が発生し、増設躯体の延びる方向に裂けるようにして割裂破壊が発生することがある。そのため、このような割裂破壊を抑制できる躯体接合構造が求められている。 By the way, in the skeleton joining structure in which the rod-shaped shear key is arranged in the additional skeleton formed of concrete as in Patent Document 1, and in the skeleton joining structure in which the shear key of the pipe body is arranged as in Patent Document 2, the shear key is buried. A force is generated in the direction of splitting from the point where the concrete is formed, and splitting fracture may occur by splitting in the direction of extension of the additional skeleton. Therefore, there is a demand for a skeleton joint structure capable of suppressing such split fracture.

本発明は上記課題に鑑み提案するものであり、既存躯体とコンクリートで形成されている増設躯体を略棒状のシアキーを介して接合する躯体接合構造において、シアキーが設けられている箇所から増設躯体の延びる方向に割裂破壊が拡がることを抑制することができる躯体接合構造及びその構築方法、並びに躯体接合構造に用いる割裂防止筋を提供することを目的とする。 The present invention has been proposed in view of the above problems, and in a skeleton joining structure in which an existing skeleton and an additional skeleton formed of concrete are joined via a substantially rod-shaped shear key, the additional skeleton is provided from a position where the shear key is provided. It is an object of the present invention to provide a skeleton joint structure capable of suppressing the spread of split fracture in the extending direction, a method for constructing the skeleton joint structure, and a split prevention muscle used for the skeleton joint structure.

本発明の躯体接合構造は、既存躯体とコンクリートで形成されている増設躯体とが略棒状のシアキーを介して接合され、前記増設躯体内の前記シアキーの部分の前記増設躯体の延びる方向における両側に、割裂防止筋が当接するようにして設けられ、前記シアキーの部分の一方側に当接する前記割裂防止筋の第1の当接部と他方側に当接する前記割裂防止筋の第2の当接部とがバネ部を介して連結され、前記バネ部の付勢により前記第1の当接部と前記第2の当接部が前記シアキーの部分の両側に当接されていることを特徴とする。
In the skeleton joining structure of the present invention, the existing skeleton and the additional skeleton formed of concrete are joined via a substantially rod-shaped shear key, and the portion of the shear key in the additional skeleton is formed on both sides in the extending direction of the additional skeleton. , The split prevention muscle is provided so as to abut, and the first contact portion of the split prevention muscle that abuts on one side of the shear key portion and the second contact portion of the split prevention muscle that abuts on the other side. The portion is connected via a spring portion, and the first contact portion and the second contact portion are in contact with both sides of the shear key portion due to the urging of the spring portion. do.

れによれば、シアキーの両側に当接する割裂防止筋によって増設躯体の延びる方向にコンクリートを割り裂こうとする力を効果的に低減し、ひび割れや割裂破壊の発生を防止することができ、割裂破壊に対する耐力を一層高めることができる。また、シアキーの両側に生じる支圧応力によって、コンクリートが圧壊する支圧破壊に対しても、シアキーの両側に当接する割裂防止筋に支圧応力を分散させ、支圧耐力を増加させることができる。また、シアキーの両側に割裂防止筋を当接する構造では、シアキーと割裂防止筋の位置決めが容易となり、施工性を高めることができる。 According to this , it is possible to effectively reduce the force to split the concrete in the extending direction of the additional skeleton by the anti-splitting bars that abut on both sides of the shear key, and to prevent the occurrence of cracks and split fracture. The resistance to split fracture can be further increased. In addition, even in the case of bearing fracture where concrete is crushed by the bearing stress generated on both sides of the shear key, the bearing stress can be dispersed to the split prevention muscles that abut on both sides of the shear key, and the bearing capacity can be increased. .. Further, in the structure in which the shear key and the split prevention bar are in contact with both sides of the shear key, the shear key and the split prevention bar can be easily positioned, and the workability can be improved.

前記シアキーの部分の一方側に当接する前記割裂防止筋の第1の当接部と他方側に当接する前記割裂防止筋の第2の当接部とがバネ部を介して連結され、前記バネ部の付勢により前記第1の当接部と前記第2の当接部が前記シアキーの部分の両側に当接されていることによれば、第1の当接部と第2の当接部で挟持するようにシアキーに当接させ、割裂防止筋をシアキーに仮止めすることができる。従って、割裂防止筋をシアキーに容易且つ確実に当接させることができると共に、先に既存躯体に配置されたシアキーに仮止めできるため、割裂防止筋を地組する必要性が無く、施工性を高めることができる。
The first contact portion of the split prevention bar that abuts on one side of the shear key portion and the second contact portion of the split prevention bar that abuts on the other side are connected via a spring portion, and the spring. The first contact portion and the second contact portion are in contact with both sides of the shear key portion due to the urging of the portion.ToAccording to this, the shear key can be brought into contact with the shear key so as to be sandwiched between the first contact portion and the second contact portion, and the split prevention muscle can be temporarily fixed to the shear key. Therefore, the anti-splitting bar can be easily and surely brought into contact with the shear key, and can be temporarily fixed to the shear key previously placed on the existing skeleton. Can be enhanced.

本発明の躯体接合構造は、前記増設躯体内の前記シアキーの部分の最大径が30mm以上であることを特徴とする。
これによれば、シアキーが太径である場合にはシアキーの設置本数を減らせる一方で、個々のシアキーの耐力が大きくなり割裂破壊が生じやすくなるが、このような太径のシアキーを用いた場合にも、シアキーが設けられている箇所から増設躯体の延びる方向にひび割れ、割裂破壊が拡がることを効果的に抑制することができる。
The skeleton joining structure of the present invention is characterized in that the maximum diameter of the shear key portion in the expansion skeleton is 30 mm or more.
According to this, when the shear key has a large diameter, the number of shear keys installed can be reduced, but the yield strength of each shear key increases and split fracture is likely to occur. Even in this case, it is possible to effectively suppress the spread of cracking and split fracture in the direction in which the additional skeleton extends from the location where the shear key is provided.

本発明の躯体接合構造は、前記シアキーが中実の略棒状で形成され、前記シアキーの前記増設躯体への埋込長さが、前記シアキーの太径部若しくは30mm以上の直径の前記シアキーの3倍以上であることを特徴とする。
これによれば、中実の略棒状のシアキーは、管体と異なり内部へのコンクリート充填への配慮が不要で、増設躯体に十分な長さを容易に定着させることができる。また、シアキーを増設躯体に長く埋め込み、特許文献2の突設連結筋のような構造を用いずともシアキーの回転を防止することができる。
In the skeleton joining structure of the present invention, the shear key is formed in a solid substantially rod shape, and the embedded length of the shear key in the additional skeleton is 3 of the shear key having a large diameter portion of the shear key or a diameter of 30 mm or more. It is characterized by being more than doubled.
According to this, unlike the pipe body, the solid substantially rod-shaped shear key does not require consideration for filling concrete inside, and a sufficient length can be easily fixed to the additional skeleton. Further, the shear key can be embedded in the additional skeleton for a long time, and the rotation of the shear key can be prevented without using the structure like the projecting connecting bar of Patent Document 2.

本発明の躯体接合構造は、前記割裂防止筋の一部が前記増設躯体の内方に延びるようにして前記増設躯体に埋設されていることを特徴とする。
これによれば、割裂防止筋の一部を増設躯体の内方に延びるように埋設することにより、増設躯体のコンクリートと割裂防止筋との一体性を増し、シアキーが設けられている箇所から増設躯体の延びる方向にひび割れ、割裂破壊が拡がることを一層抑制することができる。更に、増設躯体内のシアキーの部分の両側に割裂防止筋を当接する場合には、割裂破壊に対する耐力をより一層高めることができると共に、シアキーの両側に当接する割裂防止筋に支圧応力を分散させ、より広い面積で応力を受けることができるため、支圧耐力を一層増加させることができる。
The skeleton joining structure of the present invention is characterized in that a part of the split prevention muscle is embedded in the additional skeleton so as to extend inward of the additional skeleton.
According to this, by burying a part of the crack prevention bar so as to extend inward of the expansion skeleton, the concrete of the expansion skeleton and the crack prevention bar are more integrated, and the expansion is made from the place where the shear key is provided. It is possible to further suppress the spread of cracking and split fracture in the extending direction of the skeleton. Furthermore, when the anti-splitting muscles are abutted on both sides of the shear key part in the additional skeleton, the proof stress against splitting fracture can be further increased, and the bearing stress is dispersed to the anti-splitting muscles abutting on both sides of the shear key. Since the stress can be received in a wider area, the bearing capacity can be further increased.

本発明の躯体接合構造の構築方法は、本発明の躯体接合構造を構築する方法であって、既存躯体の表面に設けられている仕上材を残した状態で前記シアキーを前記既存躯体に埋め込んで固定する第1工程と、前記仕上材を残した状態で、前記既存躯体から突出する前記シアキーの部分の両側に割裂防止筋を当接配置し、前記増設躯体を構成するコンクリートを打設する第2工程を備えることを特徴とする。
これによれば、シアキーの両側に当接配置される割裂防止筋が増設側のコンクリートの損傷による変形を低減することができ、接合部の耐力だけではなく、剛性を増加することができる。したがって、通常は吹付タイル等の強度の低い仕上材が既存躯体の表面にある場合、仕上材の部分におけるシアキーの変形が大きく、既存躯体から増設躯体へせん断力を伝達することができないため、仕上材を除去して既存躯体の表面を目荒らし、既存躯体と増設躯体の一体性を高める処理を行う必要があるが、例えば径30mm以上のシアキーを用い、更に両側に当接配置される割裂防止筋を用いることにより、既存躯体と増設躯体の接合部のずれ方向の剛性が増大し、仕上材の除去処理を無くす或いは最小限に留めることや、既存躯体の表面を目荒らしする工程を無くすことが可能となり、躯体接合の施工性をより一層高め、施工時の騒音、振動を低減することができ、又、工期短縮を図ることができる。
The method for constructing the skeleton joint structure of the present invention is a method for constructing the skeleton joint structure of the present invention, in which the shear key is embedded in the existing skeleton while leaving the finishing material provided on the surface of the existing skeleton. The first step of fixing, and the first step of placing concrete constituting the additional skeleton by abutting and arranging split prevention bars on both sides of the shear key portion protruding from the existing skeleton while leaving the finishing material. It is characterized by having two steps.
According to this, the anti-splitting bars arranged in contact with both sides of the shear key can reduce the deformation due to the damage of the concrete on the extension side, and can increase not only the yield strength of the joint but also the rigidity. Therefore, when a low-strength finishing material such as sprayed tile is normally on the surface of the existing skeleton, the shear key is greatly deformed in the finishing material part, and the shearing force cannot be transmitted from the existing skeleton to the additional skeleton. It is necessary to remove the material to roughen the surface of the existing skeleton and improve the integrity of the existing skeleton and the additional skeleton. By using streaks, the rigidity of the joint between the existing skeleton and the additional skeleton in the displacement direction is increased, and the removal process of the finishing material is eliminated or minimized, and the process of roughening the surface of the existing skeleton is eliminated. It is possible to further improve the workability of skeleton joining, reduce noise and vibration during construction, and shorten the construction period.

本発明の割裂防止筋は、既存躯体とコンクリートで形成されている増設躯体とが略棒状のシアキーを介して接合される構造で、前記増設躯体内の前記シアキーの部分の前記増設躯体の延びる方向における両側に当接して設けられる割裂防止筋であって、前記シアキーの部分の一方側に当接する第1の当接部と他方側に当接する第2の当接部とがバネ部を介して連結されていることを特徴とする。
これによれば、シアキーの両側に割裂防止筋を当接させることによって増設躯体の延びる方向にコンクリートを割り裂こうとする力を効果的に低減し、ひび割れや割裂破壊の発生を防止することができ、割裂破壊に対する耐力を一層高めることができる。また、シアキーの両側に生じる支圧応力によって、コンクリートが圧壊する支圧破壊に対しても、シアキーの両側に割裂防止筋を当接させることで支圧応力を分散させ、支圧耐力を増加させることができる。また、バネ部を介して連結される第1の当接部と第2の当接部で挟持するようにシアキーに当接させ、割裂防止筋をシアキーに仮止めし、容易に位置決めすることができる。従って、割裂防止筋をシアキーに容易且つ確実に当接させることができると共に、先に既存躯体に配置されたシアキーに仮止めできるため、割裂防止筋を地組する必要性が無く、施工性を高めることができる。
The split prevention bar of the present invention has a structure in which an existing skeleton and an expansion skeleton made of concrete are joined via a substantially rod-shaped shear key, and the direction in which the expansion skeleton of the shear key portion in the expansion skeleton extends. A first contact portion that abuts on one side of the shear key portion and a second abutment portion that abuts on the other side are provided via a spring portion. It is characterized by being connected.
According to this, by abutting the anti-splitting bars on both sides of the shear key, the force to split the concrete in the extending direction of the additional skeleton can be effectively reduced, and the occurrence of cracks and split fracture can be prevented. It is possible to further increase the resistance to split fracture. In addition, even in the case of bearing fracture where concrete is crushed by the bearing stress generated on both sides of the shear key, the bearing stress is dispersed by abutting the split prevention bars on both sides of the shear key, and the bearing capacity is increased. be able to. Further, it is possible to abut the shear key so as to be sandwiched between the first contact portion and the second contact portion connected via the spring portion, and temporarily fix the split prevention muscle to the shear key for easy positioning. can. Therefore, the anti-splitting bar can be easily and surely brought into contact with the shear key, and can be temporarily fixed to the shear key previously placed on the existing skeleton. Can be enhanced.

本発明によれば、既存躯体とコンクリートで形成されている増設躯体を略棒状のシアキーを介して接合する躯体接合構造において、シアキーが設けられている箇所から増設躯体の延びる方向に割裂破壊が拡がることを抑制することができる。 According to the present invention, in a skeleton joining structure in which an existing skeleton and an additional skeleton formed of concrete are joined via a substantially rod-shaped shear key, split fracture spreads in the direction in which the additional skeleton extends from the location where the shear key is provided. Can be suppressed.

(a)は本発明による第1実施形態の躯体接合構造で設置された増設壁と既存躯体の柱及び梁を示す正面図、(b)は同図(a)の縦断面図。(A) is a front view showing an extension wall installed in the skeleton joint structure of the first embodiment according to the present invention and columns and beams of an existing skeleton, and (b) is a vertical sectional view of the same figure (a). 図1(a)の左隅部近傍の部分拡大図。A partially enlarged view of the vicinity of the left corner of FIG. 1 (a). (a)は第1実施形態の躯体接合構造の部分正面図、(b)はその部分縦断説明図、(c)はその部分横断説明図。(A) is a partial front view of the skeleton joint structure of the first embodiment, (b) is a partial vertical section explanatory view, and (c) is a partial cross-sectional explanatory view. (a)は第1実施形態の躯体接合構造の第1施工例を説明する説明図、(b)は第1実施形態の躯体接合構造の第2施工例を説明する説明図。(A) is an explanatory diagram for explaining a first construction example of the skeleton joint structure of the first embodiment, and (b) is an explanatory diagram for explaining a second construction example of the skeleton joint structure of the first embodiment. (a)はシアキーと割裂防止筋が離れている比較例の躯体接合構造におけるせん断力の作用を説明する正面説明図、(b)は同図(a)の比較例における割裂破壊を説明する平面説明図、(c)は同図(a)の比較例における支圧破壊を説明する平面説明図。(A) is a front explanatory view explaining the action of shear force in the skeleton joint structure of the comparative example in which the shear key and the anti-splitting muscle are separated, and (b) is a plane explaining the split fracture in the comparative example of the same figure (a). Explanatory drawing, (c) is a plan explanatory view explaining the bearing pressure fracture in the comparative example of the figure (a). 本発明による第2実施形態の躯体接合構造におけるシアキーと割裂防止筋を示す斜視図。The perspective view which shows the shear key and the split prevention muscle in the skeleton joint structure of 2nd Embodiment by this invention. 本発明による第3実施形態の躯体接合構造におけるシアキーと割裂防止筋を示す斜視図。The perspective view which shows the shear key and the split prevention muscle in the skeleton joint structure of 3rd Embodiment by this invention. (a)は本発明による第4実施形態の躯体接合構造におけるシアキーと割裂防止筋を示す分解斜視図、(b)はその斜視図。(A) is an exploded perspective view showing a shear key and a split prevention muscle in the skeleton joint structure of the fourth embodiment according to the present invention, and (b) is a perspective view thereof. (a)は本発明による第5実施形態の躯体接合構造におけるシアキーと割裂防止筋を示す分解斜視図、(b)はその斜視図。(A) is an exploded perspective view showing a shear key and a split prevention muscle in the skeleton joint structure of the fifth embodiment according to the present invention, and (b) is a perspective view thereof. 本発明による第6実施形態の躯体接合構造の部分縦断説明図。A partial longitudinal explanatory view of the skeleton joint structure of the sixth embodiment according to the present invention. 本発明による第7実施形態の躯体接合構造の部分縦断説明図。The partial longitudinal explanatory view of the skeleton joint structure of the 7th Embodiment by this invention. 第1実施形態の躯体接合構造で設置された増設壁と仕上材を表面に有する既存躯体の柱及び梁を示す正面図。The front view which shows the column and the beam of the existing skeleton which has an extension wall and a finishing material installed in the skeleton joint structure of 1st Embodiment on the surface. 第1実施形態の躯体接合構造で設置された増設床と既存躯体の柱及び梁を示す平面図。The plan view which shows the additional floor installed in the skeleton joint structure of 1st Embodiment, and the columns and beams of an existing skeleton.

〔第1実施形態の躯体接合構造〕
本発明による第1実施形態の躯体接合構造は、図1~図3に示すように、例えば柱11と梁12で構成される既存躯体10において柱11と梁12で囲まれる空間に増設壁を増設躯体20として設け、既存躯体10と増設躯体20とをせん断力を伝達する略棒状のシアキー30を介して接合するものである。既存躯体10はコンクリートで形成され、その内部には配筋13が埋設されている。増設躯体20もコンクリートで形成され、その内部には縦横に配筋21が埋設されている。
[Skeleton bonding structure of the first embodiment]
In the skeleton joining structure of the first embodiment according to the present invention, as shown in FIGS. 1 to 3, for example, in an existing skeleton 10 composed of columns 11 and beams 12, an additional wall is provided in a space surrounded by columns 11 and beams 12. It is provided as an additional skeleton 20, and the existing skeleton 10 and the additional skeleton 20 are joined via a substantially rod-shaped shear key 30 that transmits a shearing force. The existing skeleton 10 is made of concrete, and a reinforcing bar 13 is embedded inside the existing skeleton 10. The additional skeleton 20 is also made of concrete, and reinforcements 21 are embedded vertically and horizontally inside the additional skeleton 20.

第1実施形態におけるシアキー30は、中実の略棒状であり、柱状の太径部31と、太径部31よりも径が小さい柱状の細径部32を有する段付き形状であり、太径部31の一方の端面から突出するように細径部32が形成され、例えば丸鋼や異形鉄筋などの鋼材等で形成されている。シアキー30は、その細径部32と太径部31の一部が既存躯体10に埋め込むように固定され、太径部31の残部が増設躯体20に埋め込むように固定されて、既存躯体10と増設躯体20を接合する。 The shear key 30 in the first embodiment has a solid substantially rod shape, has a stepped shape having a columnar large diameter portion 31 and a columnar small diameter portion 32 having a diameter smaller than that of the large diameter portion 31, and has a large diameter. The small diameter portion 32 is formed so as to protrude from one end surface of the portion 31, and is formed of, for example, a steel material such as round steel or deformed reinforcing bar. The shear key 30 is fixed so that a part of the small diameter portion 32 and the large diameter portion 31 is embedded in the existing skeleton 10, and the rest of the large diameter portion 31 is fixed so as to be embedded in the additional skeleton 20. Join the additional skeleton 20.

シアキー30の太径部31の一部は、既存躯体10に埋め込んだ状態で既存躯体10の配筋13の位置まで到達しない長さで形成され、配筋13に干渉しないように既存躯体10に埋設されている。シアキー30の細径部32は、既存躯体10に埋め込んだ状態で既存躯体10の配筋13よりも深い位置まで延びる長さで形成され、既存躯体10の配筋13の間に入って配筋13よりも深い位置まで延びるように埋設されている。この既存躯体10に埋設される太径部31の一部の埋込長さは例えば20~30mm、細径部32の埋込長さは例えば60mm以上とすると良好である。 A part of the large diameter portion 31 of the shear key 30 is formed in a length that does not reach the position of the reinforcing bar 13 of the existing skeleton 10 in a state of being embedded in the existing skeleton 10, and is formed in the existing skeleton 10 so as not to interfere with the reinforcing bar 13. It is buried. The small diameter portion 32 of the shear key 30 is formed with a length extending to a position deeper than the reinforcement 13 of the existing skeleton 10 in a state of being embedded in the existing skeleton 10, and is inserted between the reinforcement 13 of the existing skeleton 10 to arrange the reinforcement. It is buried so as to extend to a position deeper than 13. It is preferable that the embedding length of a part of the large diameter portion 31 embedded in the existing skeleton 10 is, for example, 20 to 30 mm, and the embedding length of the small diameter portion 32 is, for example, 60 mm or more.

シアキー30は、増設躯体20である増設壁の外周に所定間隔を開けて設置され、各設置個所で既存躯体10と増設躯体20に埋込固定され、既存躯体10と増設躯体20を接合している。尚、個々のシアキー30の耐力を大きくし、シアキー30の設置本数を減らす観点からは、シアキー30の太径部31の径を30mm以上とする等、増設躯体20内に埋め込まれるシアキー30の部分の最大径を30mm以上とすると好適である。また、シアキー30のせん断力による転倒を確実に防止する観点から、シアキー30の増設躯体20への埋込長さは太径部31の直径の3倍以上とすると好適であり、3倍~5倍程度とするとより好適である。
The shear key 30 is installed on the outer periphery of the expansion wall, which is the expansion skeleton 20, at a predetermined interval, and is embedded and fixed in the existing skeleton 10 and the expansion skeleton 20 at each installation location, and the existing skeleton 10 and the expansion skeleton 20 are joined to each other. There is. From the viewpoint of increasing the yield strength of each shear key 30 and reducing the number of shear keys installed, the diameter of the large diameter portion 31 of the shear keys 30 is set to 30 mm or more, and the portion of the shear keys 30 embedded in the expansion frame 20 is formed. It is preferable that the maximum diameter of the above is 30 mm or more. Further, from the viewpoint of surely preventing the shear key 30 from tipping over due to the shearing force, it is preferable that the embedding length of the shear key 30 in the additional skeleton 20 is 3 times or more the diameter of the large diameter portion 31, and 3 times to 5 times. It is more preferable to set it to about twice.

増設躯体20の内部には略U字形状の割裂防止筋40が設けられている。割裂防止筋40は、増設躯体20内のシアキー30の部分に相当する太径部31に対し、増設躯体20の延びる方向における太径部31の両側に太径部31に近接するように設けられ、本実施形態では増設躯体20内の太径部31の両側に一対の割裂防止筋40・40が当接して設けられている。略U字形状の割裂防止筋40の一部は、増設躯体20の内方に延びるように設けられる延在部42になっており、割裂防止筋40は、シアキー30と当接する架橋部41を外側(柱11又は梁12側)、延在部42を内側(増設躯体20の中心側)にして増設躯体20に埋設されている。 A substantially U-shaped split prevention bar 40 is provided inside the additional skeleton 20. The split prevention bar 40 is provided so as to be close to the large diameter portion 31 on both sides of the large diameter portion 31 in the extending direction of the expansion skeleton 20 with respect to the large diameter portion 31 corresponding to the portion of the shear key 30 in the expansion skeleton 20. In the present embodiment, a pair of split prevention bars 40 and 40 are provided in contact with both sides of the large diameter portion 31 in the extension skeleton 20. A part of the substantially U-shaped split prevention bar 40 is an extending portion 42 provided so as to extend inward of the extension skeleton 20, and the split prevention bar 40 has a bridging portion 41 in contact with the shear key 30. It is embedded in the expansion skeleton 20 with the extending portion 42 on the outside (pillar 11 or beam 12 side) and the extension portion 42 on the inside (center side of the expansion skeleton 20).

割裂防止筋40を設置する際には、例えば図4(a)に示すように、既存躯体10の打継ぎ面にシアキー30を打ち込んで増設躯体20の配筋21を配置した後、図示の矢印のように割裂防止筋40を横向きにして差し込み、回転させてシアキー30に当接する所定位置に配置し、その後、型枠を設置してコンクリートを打設し、増設躯体20内に所定位置で割裂防止筋40を設置することが可能である。 When installing the split prevention bar 40, for example, as shown in FIG. 4A, after driving the shear key 30 into the joint surface of the existing skeleton 10 to arrange the reinforcing bar 21 of the additional skeleton 20, the arrow in the figure is shown. Insert the split prevention bar 40 sideways, rotate it and place it in a predetermined position that abuts on the shear key 30, then install a formwork and place concrete, and split it in the expansion frame 20 at a predetermined position. It is possible to install the preventive bar 40.

また、別例として図4(b)のように、割裂防止筋40がシアキー30に当接するように実線で示すシアキー30と割裂防止筋40を地組して結束線等で仮止めし、その状態でシアキー30を既存躯体10の打継ぎ面に打ち込んで固定し、その後、配筋21を施してから型枠を設置してコンクリートを打設し、増設躯体20内に所定位置で割裂防止筋40を設置することが可能である。 Further, as another example, as shown in FIG. 4B, the shear key 30 and the split prevention muscle 40 shown by solid lines are grounded and temporarily fixed with a binding line or the like so that the split prevention muscle 40 abuts on the shear key 30. In this state, the shear key 30 is driven into the joint surface of the existing skeleton 10 to fix it, and then the reinforcement 21 is provided, the formwork is installed and concrete is placed, and the split prevention bar is placed in the additional skeleton 20 at a predetermined position. It is possible to install 40.

第1実施形態によれば、シアキー30の両側に近接する割裂防止筋40が増設躯体20の延びる方向に割り裂こうとする力が発生した際にシアキー30に当接し、増設躯体20の延びる方向にコンクリートを割り裂こうとする力を効果的に低減し、シアキー30が設けられている箇所から増設躯体20の延びる方向にひび割れ、割裂破壊が拡がることを抑制することができる。特に、増設躯体20内のシアキー30の部分の最大径が30mm以上でシアキー30が太径である場合には、シアキー30の設置本数を減らせる一方で、個々のシアキー30の耐力が大きくなり割裂破壊が生じやすくなるが、このような太径のシアキー30を用いた場合にも、シアキー30が設けられている箇所から増設躯体20の延びる方向にひび割れ、割裂破壊が拡がることを抑制することができる。更に、第1実施形態では、シアキー30の両側に割裂防止筋40を当接させることにより、増設躯体20の延びる方向にコンクリートを割り裂こうとする力を低減し、ひび割れや割裂破壊の発生を防止することができ、割裂破壊に対する耐力を一層高めることができる。 According to the first embodiment, when the split prevention muscles 40 adjacent to both sides of the shear key 30 generate a force to split in the extending direction of the additional skeleton 20, they come into contact with the shear key 30 and the direction in which the additional skeleton 20 extends. It is possible to effectively reduce the force of splitting the concrete and prevent the expansion skeleton 20 from cracking in the extending direction from the location where the shear key 30 is provided and spreading the split fracture. In particular, when the maximum diameter of the shear key 30 in the expansion frame 20 is 30 mm or more and the shear key 30 has a large diameter, the number of shear keys 30 installed can be reduced, while the yield strength of each shear key 30 increases and the shear keys 30 split. Destruction is likely to occur, but even when such a large-diameter shear key 30 is used, it is possible to prevent cracks and split fracture from spreading in the direction in which the additional skeleton 20 extends from the location where the shear key 30 is provided. can. Further, in the first embodiment, by abutting the split prevention bars 40 on both sides of the shear key 30, the force of splitting the concrete in the extending direction of the additional skeleton 20 is reduced, and cracks and split fractures occur. It can be prevented and the yield strength against split fracture can be further increased.

また、シアキー30の両側に割裂防止筋40を当接させることにより、シアキー30の両側に生じる支圧応力により、コンクリート製の増設躯体20のシアキー側部のコンクリートが圧壊する支圧破壊に対し、シアキー30の両側に当接する割裂防止筋40に圧壊力、支圧応力を分散させ、支圧耐力を増加させることができる。また、シアキー30の両側に割裂防止筋40を当接する構造では、シアキー30と割裂防止筋40の位置決めが容易となり、施工性を高めることができる。 Further, in response to the bearing pressure fracture in which the concrete on the shear key side of the concrete expansion skeleton 20 is crushed by the bearing stress generated on both sides of the shear key 30 by abutting the split prevention bars 40 on both sides of the shear key 30. The crushing force and the bearing stress can be dispersed in the split prevention muscles 40 that come into contact with both sides of the shear key 30, and the bearing bearing capacity can be increased. Further, in the structure in which the tear prevention bars 40 are in contact with both sides of the shear key 30, the shear key 30 and the split prevention bars 40 can be easily positioned and the workability can be improved.

付言すると、図5のように、シアキー30の両側に割裂防止筋40と同形状の幅止め筋4を近接せずに離して配置した躯体接合構造では、図5(a)の太線矢印のせん断力がシアキー30に作用した際に、図5(b)の太線矢印のように割り裂こうとする力が発生し、ひび割れ、割裂破壊が拡がり易くなり、又、図5(c)の太線矢印のようにシアキー30の支圧応力でコンクリートの圧壊による支圧破壊が発生し易くなる。 In addition, as shown in FIG. 5, in the skeleton joint structure in which the width retaining bars 4 having the same shape as the split prevention bars 40 are arranged on both sides of the shear key 30 so as not to be close to each other, the shearing of the thick arrow in FIG. When the force acts on the shear key 30, a force that tries to split is generated as shown by the thick arrow in FIG. 5 (b), and cracks and split fractures are easily spread, and the thick arrow in FIG. 5 (c). As described above, the bearing stress of the shear 30 tends to cause bearing fracture due to crushing of concrete.

また、割裂防止筋40の一部である延在部42を増設躯体20の内方に延びるように埋設することにより、コンクリートと割裂防止筋との一体性を増すことができ、シアキー30が設けられている箇所から増設躯体20の延びる方向にひび割れ、割裂破壊が拡がることを一層抑制することができる。また、割裂防止筋40が増設躯体20に配筋された既存躯体10に最も近い横筋の鉄筋21aの外側で増設躯体20の内方に延びる場合、鉄筋21aが割裂防止筋40により拘束され、シアキー30が設けられている箇所から増設躯体20の延びる方向にひび割れ、割裂破壊が拡がることを更に抑制することができる。また、増設躯体20に配筋された縦筋の鉄筋21bは、増設躯体20の端部で止まっているため、この部分では鉄筋とコンクリートの一体性が低く、増設躯体20の打継ぎ面に近い部分はせん断破壊を生じやすいが、割裂防止筋40の一部である延在部42を増設躯体20の内方に延びるように埋設することにより、鉄筋21bとコンクリートの一体性が低い部分を補強することができ、増設躯体20のせん断耐力を増加させることができる。更に、増設躯体20内のシアキー30の部分の両側に割裂防止筋40を当接する構造では、シアキー30の両側に当接する延在部42を有する割裂防止筋40に支圧応力を分散させ、より広い面積で応力を受けることができるため、支圧耐力を一層増加させることができる。 Further, by burying the extending portion 42, which is a part of the crack preventing bar 40, so as to extend inward of the additional skeleton 20, the integrity between the concrete and the crack preventing bar can be increased, and the shear key 30 is provided. It is possible to further suppress the spread of cracking and split fracture in the direction in which the additional skeleton 20 extends from the location where the concrete is formed. Further, when the split prevention bar 40 extends inward of the extension skeleton 20 on the outside of the horizontal reinforcing bar 21a closest to the existing skeleton 10 arranged on the extension skeleton 20, the reinforcing bar 21a is restrained by the split prevention bar 40 and the shear key. It is possible to further suppress the spread of cracking and split fracture in the direction in which the additional skeleton 20 extends from the location where 30 is provided. Further, since the reinforcing bars 21b of the vertical bars arranged in the additional skeleton 20 are stopped at the end of the additional skeleton 20, the integralness of the reinforcing bars and the concrete is low in this portion, and it is close to the joint surface of the additional skeleton 20. The portion is prone to shear failure, but by burying the extending portion 42, which is a part of the split prevention reinforcement 40, so as to extend inward of the additional skeleton 20, the portion where the reinforcing bar 21b and the concrete are not integrated is reinforced. It is possible to increase the shear strength of the additional skeleton 20. Further, in the structure in which the split prevention muscles 40 abut on both sides of the portion of the shear key 30 in the additional skeleton 20, the bearing stress is dispersed in the split prevention muscles 40 having the extending portions 42 abutting on both sides of the shear key 30. Since stress can be received over a wide area, the bearing capacity can be further increased.

また、例えば特許文献2の管体をシアキーとして用いる構成では、管体を長くすると増設躯体のコンクリート打設時に、管体内へコンクリートが十分に充填されない可能性があるため、管体を必要な長さだけ増設躯体20側へ延伸させることが難しい。そのため、シアキーがせん断力を受けた時に生じるシアキーの回転を防止するために、突設連結筋を用いている。この突設連結筋は、シアキーの回転変形を低減させることが主な目的であり、割裂防止筋40のように、割裂防止のためにコンクリートを拘束する効果や、支圧力を受ける面積を増加させる効果はない。一方、シアキー30は、管状ではなく中実の略棒状であるため、増設躯体20に十分な長さを定着させることが容易にでき、更に、シアキー30の長さを長くしてシアキー30の増設躯体20への埋込長さを30mm以上の太径部31の3倍以上とすることにより、突設連結筋を不要とし且つシアキーを構成する管体へのコンクリート充填に対する施工管理を無くし、シアキー30の回転を防止することができる。即ち、シアキー30の回転はシアキー30の長さを長くすることで防止し、それに加えて、割裂防止筋40により、増設躯体20の割裂破壊の防止、支圧耐力の増加、増設躯体20のせん断耐力の増加といった効果を期待することができるため、シアキー30と割裂防止筋40の組み合わせによって既存躯体10と増設躯体20をより強固に接続することができ、非常に効果的な耐震補強が実現される。 Further, for example, in the configuration in which the pipe body of Patent Document 2 is used as a shear key, if the pipe body is lengthened, the concrete may not be sufficiently filled in the pipe body when the concrete of the additional skeleton is placed. It is difficult to extend it to the side of the additional skeleton 20. Therefore, in order to prevent the rotation of the shear key that occurs when the shear key receives a shearing force, a projecting connecting bar is used. The main purpose of this projecting connecting bar is to reduce the rotational deformation of the shear key, and like the split prevention bar 40, it has the effect of restraining concrete to prevent splitting and increases the area that receives bearing pressure. There is no effect. On the other hand, since the shear key 30 is not tubular but has a solid substantially rod shape, it is easy to fix a sufficient length to the expansion skeleton 20, and further, the length of the shear key 30 is increased to expand the shear key 30. By making the embedded length in the skeleton 20 more than three times that of the large diameter portion 31 of 30 mm or more, the projecting connecting bar is not required and the construction management for concrete filling in the pipe body constituting the shear key is eliminated. It is possible to prevent the rotation of 30. That is, the rotation of the shear key 30 is prevented by lengthening the length of the shear key 30, and in addition, the split prevention muscle 40 prevents the expansion skeleton 20 from splitting and breaking, increases the bearing capacity, and shears the expansion skeleton 20. Since the effect of increasing the yield strength can be expected, the combination of the shear key 30 and the split prevention muscle 40 makes it possible to connect the existing skeleton 10 and the additional skeleton 20 more firmly, and very effective seismic reinforcement is realized. Ru.

〔第2実施形態の躯体接合構造〕
本発明による第2実施形態の躯体接合構造及びその構成部材は、シアキー30aが異なること以外は第1実施形態と同様である。第2実施形態におけるシアキー30aは、図6に示すように、全長に亘って略同一の外径を有する棒状であり、図示例では円柱形になっており、例えば丸鋼等で形成されている。ただし、異形棒鋼のように全く同一の外形ではない構成とすることも可能である。また、シアキー30aは、その一部が既存躯体10に埋め込むように固定され、残部が増設躯体20に埋め込むように固定されて既存躯体10と増設躯体20を接合する。シアキー30aには、埋め込まれた状態の増設躯体20の内部において、その両側に割裂防止筋40が近接するように設けられ、好適には両側に割裂防止筋40が当接して設けられる。
[Skeleton bonding structure of the second embodiment]
The skeleton joint structure and its constituent members of the second embodiment according to the present invention are the same as those of the first embodiment except that the shear key 30a is different. As shown in FIG. 6, the shear key 30a in the second embodiment has a rod shape having substantially the same outer diameter over the entire length, has a cylindrical shape in the illustrated example, and is formed of, for example, round steel. .. However, it is also possible to have a configuration that does not have exactly the same outer shape as the deformed steel bar. Further, a part of the shear key 30a is fixed so as to be embedded in the existing skeleton 10, and the rest is fixed so as to be embedded in the additional skeleton 20 to join the existing skeleton 10 and the additional skeleton 20. The shear key 30a is provided with the split prevention muscles 40 in close proximity to both sides of the expanded skeleton 20 in an embedded state, and preferably the split prevention muscles 40 are provided in contact with both sides.

尚、個々のシアキー30aの耐力を大きくし、シアキー30aの設置本数を減らす観点からは、シアキー30aの直径を30mm以上とすると好適である。また、シアキー30aのせん断力による転倒を確実に防止する観点から、シアキー30aの増設躯体20への埋込長さはシアキー30aの直径の3倍以上とすると好適であり、3倍~5倍程度とするとより好適である。 From the viewpoint of increasing the yield strength of each shear key 30a and reducing the number of shear keys 30a installed, it is preferable that the diameter of the shear keys 30a is 30 mm or more. Further, from the viewpoint of surely preventing the shear key 30a from tipping over due to the shearing force, it is preferable that the embedding length of the shear key 30a in the additional skeleton 20 is 3 times or more the diameter of the shear key 30a, and is about 3 to 5 times. Is more suitable.

第2実施形態によれば、第1実施形態と対応する構成から第1実施形態と対応する効果を得ることができる。 According to the second embodiment, the effect corresponding to the first embodiment can be obtained from the configuration corresponding to the first embodiment.

〔第3実施形態の躯体接合構造〕
本発明による第3実施形態の躯体接合構造及びその構成部材は、割裂防止筋40bが異なること以外は第2実施形態と同様である。第3実施形態における割裂防止筋40bは、図7に示すように、第1実施形態の略U字形状の割裂防止筋40・40をバネ部43bを介して連結した形状を呈しており、先端側の延在部44b・44bと、バネ部43b側の延在部45b・45bと、延在部44bと延在部45bとの間を架橋する第1実施形態の割裂防止筋40の架橋部41に対応する部分である当接部46b・46bと、延在部45b・45bの根元側を連結する略弧状のバネ部43bから構成される。延在部44bと延在部45bとの間の間隔は、シアキー30aの直径より僅かに小さく形成されている。
[Frame joint structure of the third embodiment]
The skeleton joint structure and its constituent members of the third embodiment according to the present invention are the same as those of the second embodiment except that the split prevention muscle 40b is different. As shown in FIG. 7, the split prevention muscle 40b in the third embodiment has a shape in which the substantially U-shaped split prevention muscles 40 and 40 of the first embodiment are connected via a spring portion 43b, and has a tip. The bridging portion of the split prevention muscle 40 of the first embodiment that bridges between the extending portion 44b / 44b on the side, the extending portion 45b / 45b on the spring portion 43b side, and the extending portion 44b and the extending portion 45b. It is composed of abutting portions 46b / 46b, which are portions corresponding to 41, and a substantially arc-shaped spring portion 43b connecting the root sides of the extending portions 45b / 45b. The distance between the extending portion 44b and the extending portion 45b is formed to be slightly smaller than the diameter of the shear key 30a.

割裂防止筋40bの一対の当接部46b・46bの間に配置されたシアキー30aは、バネ部43bの付勢により、当接部46b・46bで挟持され、両側から当接部46b・46bがシアキー30aに当接するようになっている。そして、増設躯体20の内部において、増設躯体20の延びる方向のシアキー30aの両側に当接部46b・46bが当接した状態で、増設躯体20及び躯体接合構造が構築される。 The shear key 30a arranged between the pair of abutting portions 46b and 46b of the split prevention bar 40b is sandwiched by the abutting portions 46b and 46b by the urging of the spring portion 43b, and the abutting portions 46b and 46b are held from both sides. It comes into contact with the shear key 30a. Then, inside the additional skeleton 20, the additional skeleton 20 and the skeleton joint structure are constructed in a state where the contact portions 46b and 46b are in contact with both sides of the shear key 30a in the extending direction of the additional skeleton 20.

第3実施形態によれば、第2実施形態と対応する構成から第2実施形態と対応する効果を得ることができる。更に、第1の当接部46bと第2の当接部46bで挟持するようにシアキー30aに当接させ、割裂防止筋40bをシアキー30aに仮止めすることができる。従って、割裂防止筋40bをシアキー30aに容易且つ確実に当接させることができると共に、先に既存躯体10に配置されたシアキー30aに仮止めできるため、割裂防止筋40bを地組する必要性が無く、施工性を高めることができる。 According to the third embodiment, the effect corresponding to the second embodiment can be obtained from the configuration corresponding to the second embodiment. Further, the shear key 30a can be brought into contact with the shear key 30a so as to be sandwiched between the first contact portion 46b and the second contact portion 46b, and the split prevention muscle 40b can be temporarily fixed to the shear key 30a. Therefore, the split prevention muscle 40b can be easily and surely brought into contact with the shear key 30a, and can be temporarily fixed to the shear key 30a previously arranged on the existing skeleton 10, so that it is necessary to construct the split prevention muscle 40b. There is no need to improve workability.

〔第4実施形態の躯体接合構造〕
本発明による第4実施形態の躯体接合構造及びその構成部材は、割裂防止筋40cが異なること以外は第2実施形態と同様である。第4実施形態における割裂防止筋40cは、図8に示すように、先端側の延在部47c・47cと、延在部47cから略L字状に屈曲して設けられる当接部48c・48cと、当接部48c・48cの根元側を連結する略弧状のバネ部49cから構成される。
[Skeleton bonding structure of the fourth embodiment]
The skeleton joint structure and its constituent members of the fourth embodiment according to the present invention are the same as those of the second embodiment except that the split prevention muscles 40c are different. As shown in FIG. 8, the split prevention muscle 40c in the fourth embodiment has the extending portions 47c and 47c on the tip side and the contact portions 48c and 48c provided by bending in a substantially L shape from the extending portion 47c. And a substantially arc-shaped spring portion 49c that connects the root sides of the contact portions 48c and 48c.

割裂防止筋40cの一対の当接部48c・48cの間に配置されたシアキー30aは、バネ部49cの付勢により、当接部48c・48cで挟持され、両側から当接部48c・48cがシアキー30aに当接するようになっている。そして、増設躯体20の内部において、増設躯体20の延びる方向のシアキー30aの両側に当接部48c・48cが当接した状態で、増設躯体20及び躯体接合構造が構築される。尚、図示例では、一対の割裂防止筋40c・40cが逆方向からシアキー30aに外嵌めされ、各々の割裂防止筋40cの当接部48c・48cが増設躯体20の延びる方向のシアキー30aの両側に当接するようになっている。 The shear key 30a arranged between the pair of contact portions 48c and 48c of the split prevention muscle 40c is sandwiched by the contact portions 48c and 48c by the urging of the spring portion 49c, and the contact portions 48c and 48c are held from both sides. It comes into contact with the shear key 30a. Then, inside the additional skeleton 20, the additional skeleton 20 and the skeleton joint structure are constructed in a state where the contact portions 48c and 48c are in contact with both sides of the shear key 30a in the extending direction of the additional skeleton 20. In the illustrated example, a pair of anti-split muscles 40c / 40c are fitted onto the shear key 30a from the opposite direction, and the contact portions 48c / 48c of the respective anti-split muscles 40c are on both sides of the shear key 30a in the extending direction of the additional skeleton 20. It is designed to come into contact with.

第4実施形態によれば、第3実施形態と対応する構成から第3実施形態と対応する効果を得ることができる。 According to the fourth embodiment, the effect corresponding to the third embodiment can be obtained from the configuration corresponding to the third embodiment.

〔第5実施形態の躯体接合構造〕
本発明による第5実施形態の躯体接合構造及びその構成部材は、割裂防止筋40dが異なること以外は第2実施形態と同様である。第5実施形態における割裂防止筋40dは、図9に示すように、第4実施形態の割裂防止筋40cの延在部47c・47cを無くした形状を呈する略U字形状であり、当接部48d・48dと、当接部48d・48dの根元側を連結する略弧状のバネ部49dから構成される。
[Frame joint structure of the fifth embodiment]
The skeleton joint structure and its constituent members of the fifth embodiment according to the present invention are the same as those of the second embodiment except that the split prevention muscle 40d is different. As shown in FIG. 9, the split prevention muscle 40d in the fifth embodiment has a substantially U-shape having a shape in which the extending portions 47c and 47c of the split prevention muscle 40c of the fourth embodiment are eliminated, and has a contact portion. It is composed of 48d / 48d and a substantially arc-shaped spring portion 49d connecting the root sides of the contact portions 48d / 48d.

割裂防止筋40dの一対の当接部48d・48dの間に配置されたシアキー30aは、バネ部49dの付勢により、当接部48d・48dで挟持され、両側から当接部48d・48dがシアキー30aに当接するようになっている。そして、増設躯体20の内部において、増設躯体20の延びる方向のシアキー30aの両側に当接部48d・48dが当接した状態で、増設躯体20及び躯体接合構造が構築される。尚、図示例では、一対の割裂防止筋40d・40dが逆方向からシアキー30aに外嵌めされ、各々の割裂防止筋40dの当接部48d・48dが増設躯体20の延びる方向のシアキー30aの両側に当接するようになっている。 The shear key 30a arranged between the pair of contact portions 48d and 48d of the split prevention bar 40d is sandwiched by the contact portions 48d and 48d by the urging of the spring portion 49d, and the contact portions 48d and 48d are held from both sides. It comes into contact with the shear key 30a. Then, inside the additional skeleton 20, the additional skeleton 20 and the skeleton joint structure are constructed in a state where the contact portions 48d and 48d are in contact with both sides of the shear key 30a in the extending direction of the additional skeleton 20. In the illustrated example, a pair of split prevention muscles 40d and 40d are fitted onto the shear key 30a from the opposite direction, and the contact portions 48d and 48d of the respective split prevention muscles 40d are on both sides of the shear key 30a in the extending direction of the additional skeleton 20. It is designed to come into contact with.

第5実施形態によれば、延在部47cに起因する効果以外、第4実施形態と対応する構成から第4実施形態と対応する効果を得ることができる。 According to the fifth embodiment, other than the effect caused by the extending portion 47c, the effect corresponding to the fourth embodiment can be obtained from the configuration corresponding to the fourth embodiment.

〔第6実施形態の躯体接合構造〕
本発明による第6実施形態の躯体接合構造及びその構成部材は、シアキー30eが異なること以外は第3実施形態と同様である。第6実施形態におけるシアキー30eは、図10に示すように、細長棒状の鉄筋で構成されている。
[Skeleton bonding structure of the sixth embodiment]
The skeleton joint structure of the sixth embodiment and its constituent members according to the present invention are the same as those of the third embodiment except that the shear key 30e is different. As shown in FIG. 10, the shear key 30e in the sixth embodiment is composed of an elongated rod-shaped reinforcing bar.

割裂防止筋40bの一対の当接部46b・46bの間に配置されたシアキー30eは、バネ部43bの付勢により、当接部46b・46bで挟持され、両側から当接部46b・46bがシアキー30eに当接するようになっている。そして、増設躯体20の内部において、増設躯体20の延びる方向のシアキー30eの両側に当接部46b・46bが当接した状態で、増設躯体20及び躯体接合構造が構築される。 The shear key 30e arranged between the pair of abutting portions 46b and 46b of the split prevention bar 40b is sandwiched by the abutting portions 46b and 46b by the urging of the spring portion 43b, and the abutting portions 46b and 46b are held from both sides. It is designed to come into contact with the shear key 30e. Then, inside the additional skeleton 20, the additional skeleton 20 and the skeleton joint structure are constructed in a state where the contact portions 46b and 46b are in contact with both sides of the shear key 30e in the extending direction of the additional skeleton 20.

第6実施形態によれば、第3実施形態と対応する構成から第3実施形態と対応する効果を得ることができる。 According to the sixth embodiment, the effect corresponding to the third embodiment can be obtained from the configuration corresponding to the third embodiment.

〔第7実施形態の躯体接合構造〕
本発明による第7実施形態の躯体接合構造及びその構成部材は、シアキー30fが異なること以外は第5実施形態と同様である。第7実施形態におけるシアキー30fは、図11に示すように、細長棒状の鉄筋33fを鋼管34fに通して構成されている。
[Skeleton bonding structure of the 7th embodiment]
The skeleton joint structure of the seventh embodiment and its constituent members according to the present invention are the same as those of the fifth embodiment except that the shear key 30f is different. As shown in FIG. 11, the shear key 30f in the seventh embodiment is configured by passing an elongated rod-shaped reinforcing bar 33f through a steel pipe 34f.

割裂防止筋40dの一対の当接部48d・48dの間に配置されたシアキー30fは、バネ部49dの付勢により、当接部48d・48dで挟持され、両側から当接部48d・48dがシアキー30fの鋼管34fに当接するようになっている。増設躯体20の内部において、増設躯体20の延びる方向のシアキー30fの両側に当接部48d・48dが当接した状態で、増設躯体20及び躯体接合構造が構築される。尚、図示例では、一対の割裂防止筋40d・40dが逆方向からシアキー30fに外嵌めされ、各々の割裂防止筋40dの当接部48d・48dが増設躯体20の延びる方向のシアキー30fの鋼管34fの両側に当接するようになっている。 The shear key 30f arranged between the pair of contact portions 48d and 48d of the split prevention bar 40d is sandwiched by the contact portions 48d and 48d by the urging of the spring portion 49d, and the contact portions 48d and 48d are held from both sides. It comes into contact with the steel pipe 34f of the shear key 30f. Inside the additional skeleton 20, the additional skeleton 20 and the skeleton joint structure are constructed in a state where the contact portions 48d and 48d are in contact with both sides of the shear key 30f in the extending direction of the additional skeleton 20. In the illustrated example, a pair of anti-splitting bars 40d and 40d are fitted onto the shear key 30f from the opposite direction, and the contact portions 48d and 48d of the respective anti-splitting bars 40d are steel pipes of the shear key 30f in the extending direction of the additional skeleton 20. It comes into contact with both sides of 34f.

第7実施形態によれば、第5実施形態と対応する構成から第5実施形態と対応する効果を得ることができる。 According to the seventh embodiment, the effect corresponding to the fifth embodiment can be obtained from the configuration corresponding to the fifth embodiment.

〔本明細書開示発明の包含範囲〕
本明細書開示の発明は、発明として列記した各発明、各実施形態の他に、適用可能な範囲で、これらの部分的な内容を本明細書開示の他の内容に変更して特定したもの、或いはこれらの内容に本明細書開示の他の内容を付加して特定したもの、或いはこれらの部分的な内容を部分的な作用効果が得られる限度で削除して上位概念化して特定したものを包含する。そして、本明細書開示の発明には下記変形例や追記した内容も含まれる。
[Scope of inclusion of the invention disclosed herein]
The invention disclosed in the present specification is specified by changing the partial contents thereof to other contents disclosed in the present specification to the extent applicable, in addition to the inventions listed as inventions and the embodiments. Or, those specified by adding other contents disclosed in the present specification to these contents, or those specified by deleting these partial contents to the extent that a partial action and effect can be obtained and making them into a higher concept. Including. The invention disclosed in the present specification also includes the following modifications and additional contents.

例えば第1実施形態の図示例では、既存躯体10の仕上材のない表面に増設躯体20である増設壁を構築する場合を示したが、図12に示すように、既存躯体10の表面に仕上材50が残った状態で増設躯体20を構築する構造も本発明に含まれる。図12の躯体接合構造の構築では、例えば既存躯体10の表面に設けられている強度の低い吹付タイル、モルタル等の仕上材50を残した状態でシアキー30等を既存躯体10に埋め込んで固定する。この際、仕上材50の厚みが厚過ぎる場合には、50mm以下、より好適には30mm以下に事前処理することが好ましい。その後、仕上材50を残した状態で、既存躯体10から突出するシアキー30等の部分の両側に割裂防止筋40等を近接配置し、増設躯体20を構成するコンクリートを打設して躯体接合構造を得る。 For example, in the illustrated example of the first embodiment, the case where the additional wall which is the additional skeleton 20 is constructed on the surface of the existing skeleton 10 without the finishing material is shown, but as shown in FIG. 12, the surface of the existing skeleton 10 is finished. The present invention also includes a structure for constructing the additional skeleton 20 with the material 50 remaining. In the construction of the skeleton joining structure of FIG. 12, for example, the shear key 30 and the like are embedded and fixed in the existing skeleton 10 with the finishing material 50 such as low-strength spray tiles and mortar provided on the surface of the existing skeleton 10 remaining. .. At this time, if the thickness of the finishing material 50 is too thick, it is preferable to pretreat to 50 mm or less, more preferably 30 mm or less. After that, with the finishing material 50 left, split prevention bars 40 and the like are placed close to both sides of the shear key 30 and the like protruding from the existing skeleton 10, and concrete constituting the additional skeleton 20 is cast to form a skeleton joint structure. To get.

通常あと施工アンカーとして用いられる直径20mm程度までのシアキーでは吹付タイルや仕上げモルタル等の強度の低い仕上材が既存躯体の表面にある場合、仕上材部分でのシアキーの剛性が低いため、既存躯体から増設躯体へのせん断力の伝達ができない。そのため、仕上材を除去して既存躯体の表面を目荒らし、既存躯体と増設躯体の一体性を高める処理を行う必要があるが、本発明では、例えば径30mm以上のシアキーを用い、割裂補強筋を近接させることで仕上材の除去処理を無くす或いは最小限に留めることや、既存躯体の表面を目荒らしする工程を無くすことが可能となり、躯体接合の施工性をより一層高め、施工時の騒音、振動を低減することができる。また工期短縮を図ることができる。 For shear keys with a diameter of up to about 20 mm, which are usually used as post-installed anchors, if low-strength finishing materials such as spray tiles and finishing mortar are on the surface of the existing skeleton, the rigidity of the shear keys at the finishing material is low, so from the existing skeleton. Shear force cannot be transmitted to the additional frame. Therefore, it is necessary to remove the finishing material to roughen the surface of the existing skeleton and to improve the integrity of the existing skeleton and the additional skeleton. It is possible to eliminate or minimize the removal process of the finishing material by bringing them close to each other, and it is possible to eliminate the process of roughening the surface of the existing skeleton, further improving the workability of skeleton joining, and making noise during construction. , Vibration can be reduced. In addition, the construction period can be shortened.

また、第1実施形態の図示例では、既存躯体10の柱11と梁12で構成される空間に増設躯体20として増設壁を形成する例を示したが、本発明における既存躯体10と増設躯体20は適宜であり、例えば図13に示すように、既存躯体10の梁12で囲まれる空間に増設躯体20として増設床を形成し、既存躯体10と増設床である増設躯体20をシアキー30等で接合し、そのシアキー30等の増設床の延びる方向における両側に割裂防止筋40等を近接或いは当接して設ける場合も本発明に含まれる。その他、例えば増設躯体20を増設梁、或いは外付補強鉄骨フレームのコンクリート接合部等とする場合も本発明に含まれる。 Further, in the illustrated example of the first embodiment, an example in which an additional wall is formed as an additional skeleton 20 in a space composed of columns 11 and beams 12 of the existing skeleton 10 is shown, but the existing skeleton 10 and the additional skeleton in the present invention are shown. Reference numeral 20 is appropriate. For example, as shown in FIG. 13, an additional floor is formed as the additional skeleton 20 in the space surrounded by the beams 12 of the existing skeleton 10, and the existing skeleton 10 and the additional floor 20 are the shear key 30 and the like. Also included in the present invention is the case where the shear key 30 and the like are joined in close proximity to or in contact with each other on both sides of the additional floor such as the shear key 30 in the extending direction. In addition, for example, the case where the additional skeleton 20 is used as an additional beam, a concrete joint of an external reinforcing steel frame, or the like is also included in the present invention.

本発明は、例えば耐震補強のために既存躯体に増設躯体を接合する際に利用することができる。 The present invention can be used, for example, when joining an additional skeleton to an existing skeleton for seismic retrofitting.

10…既存躯体 11…柱 12…梁 13…配筋 20…増設躯体 21…配筋 21a、21b…鉄筋 30、30a、30e、30f…シアキー 31…太径部 32…細径部 33f…鉄筋 34f…鋼管 40、40b、40c、40d…割裂防止筋 41…架橋部 42…延在部 43b…バネ部 44b、45b…延在部 46b…当接部 47c…延在部 48c、48d…当接部 49c、49d…バネ部 4…幅止め筋 50…仕上材
10 ... Existing skeleton 11 ... Pillar 12 ... Beam 13 ... Reinforcing bar 20 ... Additional skeleton 21 ... Reinforcing bar 21a, 21b ... Reinforcing bar 30, 30a, 30e, 30f ... Shea key 31 ... Large diameter part 32 ... Small diameter part 33f ... Reinforcing bar 34f ... Steel pipe 40, 40b, 40c, 40d ... Split prevention bar 41 ... Cross-linking part 42 ... Extension part 43b ... Spring part 44b, 45b ... Extension part 46b ... Contact part 47c ... Extension part 48c, 48d ... Contact part 49c, 49d ... Spring part 4 ... Width retaining bar 50 ... Finishing material

Claims (6)

既存躯体とコンクリートで形成されている増設躯体とが略棒状のシアキーを介して接合され、
前記増設躯体内の前記シアキーの部分の前記増設躯体の延びる方向における両側に、割裂防止筋が当接するようにして設けられ
前記シアキーの部分の一方側に当接する前記割裂防止筋の第1の当接部と他方側に当接する前記割裂防止筋の第2の当接部とがバネ部を介して連結され、
前記バネ部の付勢により前記第1の当接部と前記第2の当接部が前記シアキーの部分の両側に当接されていることを特徴とする躯体接合構造。
The existing skeleton and the additional skeleton made of concrete are joined via a substantially rod-shaped shear key.
The split prevention muscles are provided so as to abut on both sides of the shear key portion in the extension skeleton in the extending direction of the extension skeleton .
The first contact portion of the split prevention bar that abuts on one side of the shear key portion and the second contact portion of the split prevention bar that abuts on the other side are connected via a spring portion.
A skeleton joining structure characterized in that the first contact portion and the second contact portion are in contact with both sides of the shear key portion due to the urging of the spring portion .
前記増設躯体内の前記シアキーの部分の最大径が30mm以上であることを特徴とする請求項1に記載の躯体接合構造。 The skeleton joining structure according to claim 1, wherein the maximum diameter of the shear key portion in the additional skeleton is 30 mm or more. 前記シアキーが中実の略棒状で形成され、
前記シアキーの前記増設躯体への埋込長さが、前記シアキーの太径部若しくは30mm以上の直径の前記シアキーの3倍以上であることを特徴とする請求項1又は2に記載の躯体接合構造。
The shear key is formed in the shape of a solid rod,
The skeleton joining structure according to claim 1 or 2 , wherein the embedded length of the shear key in the additional skeleton is three times or more the large diameter portion of the shear key or the shear key having a diameter of 30 mm or more. ..
前記割裂防止筋の一部が前記増設躯体の内方に延びるようにして前記増設躯体に埋設されていることを特徴とする請求項1~の何れかに記載の躯体接合構造。 The skeleton joining structure according to any one of claims 1 to 3 , wherein a part of the split prevention muscle is embedded in the additional skeleton so as to extend inward of the additional skeleton. 請求項1~の何れかに記載の躯体接合構造の構築方法であって、
既存躯体の表面に設けられている仕上材を残した状態で前記シアキーを前記既存躯体に埋め込んで固定する第1工程と、
前記仕上材を残した状態で、前記既存躯体から突出する前記シアキーの部分の両側に割裂防止筋を当接配置し、前記増設躯体を構成するコンクリートを打設する第2工程 を備えることを特徴とする躯体接合構造の構築方法。
The method for constructing a skeleton joint structure according to any one of claims 1 to 4 .
The first step of embedding and fixing the shear key in the existing skeleton while leaving the finishing material provided on the surface of the existing skeleton, and
It is characterized by comprising a second step of placing anti-splitting bars on both sides of the shear key portion protruding from the existing skeleton and placing concrete constituting the additional skeleton with the finishing material left. How to build a skeleton joint structure.
既存躯体とコンクリートで形成されている増設躯体とが略棒状のシアキーを介して接合される構造で、
前記増設躯体内の前記シアキーの部分の前記増設躯体の延びる方向における両側に当接して設けられる割裂防止筋であって、
前記シアキーの部分の一方側に当接する第1の当接部と他方側に当接する第2の当接部とがバネ部を介して連結されていることを特徴とする割裂防止筋。
The structure is such that the existing skeleton and the additional skeleton made of concrete are joined via a substantially rod-shaped shear key.
It is a split prevention muscle provided in contact with both sides of the shear key portion in the extension skeleton in the extending direction of the extension skeleton.
A split prevention muscle, characterized in that a first contact portion abutting on one side of the shear key portion and a second abutment portion abutting on the other side are connected via a spring portion.
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