JP2005127056A - Joint structure of column and beam in rigid frame structural body - Google Patents

Joint structure of column and beam in rigid frame structural body Download PDF

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JP2005127056A
JP2005127056A JP2003364878A JP2003364878A JP2005127056A JP 2005127056 A JP2005127056 A JP 2005127056A JP 2003364878 A JP2003364878 A JP 2003364878A JP 2003364878 A JP2003364878 A JP 2003364878A JP 2005127056 A JP2005127056 A JP 2005127056A
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steel pipe
column
reinforcing bar
joint
fixing plate
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JP4095534B2 (en
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Hisayuki Yamanaka
久幸 山中
Hideyuki Kosaka
英之 小坂
Hiroshi Egashira
寛 江頭
Hiroshi Shinjo
浩 新上
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Sumitomo Mitsui Construction Co Ltd
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Sumitomo Mitsui Construction Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a join structure of a column and a beam capable of realizing construction by the column using a continuous steel pipe over a plurality of layers (stories) easily and providing force resistant against tensile force of a beam main reinforcing bar passing through the inside of the steel pipe securely. <P>SOLUTION: The steel pipe 11 being a constituent member of the column 1 having CFT structure is continuously formed in the vertical direction over at least a plurality of stories without dividing it. A plurality of openings 13 allowing insertion of a reinforcing bar 21a forming the beam main reinforcing bar of the beam 2 having reinforced concrete structure in play are provided on each side face by opposing mutually on both side faces of the steel pipe 11 which becomes a joint part of the column/beam at each story. The reinforcing bar 21a is fixed to a predetermined position while it passes through the openings 13 and the inside of the steel pipe 11. Opposing openings 13 are blocked by a fixation plate 30 attached to the reinforcing bar 21a. An inner side face of the fixation plate 30 is arranged in such a way that it adheres closely to concrete 12 filled in the inside of the steel pipe 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、超高層の集合住宅、オフィスビル等の建物を構築するのに好適な、ラーメン構造体における柱と梁との仕口構造に関する。   The present invention relates to a joint structure of columns and beams in a ramen structure suitable for constructing a building such as a super high-rise apartment house or office building.

鋼管の内部にコンクリートを充填した構造は、CFT(Concrete Filled Steel Tube、コンクリート充填鋼管)構造と呼ばれる。従来、CFT構造の鋼管により柱を構成し、この柱にH形鋼等の鉄骨造(S造)又は鉄骨コンクリート造(SC造)の梁を接合したラーメン構造は知られている。柱がCFT造の場合、梁との接合方法が構造上の制約を受けるため、梁はS造又はSC造として、鉄骨を用いた梁をCFT造の柱と接合する方法が一般的である。
このような鉄骨を含む梁とCFT柱との接合する場合、CFTの鋼管内にダイヤフラムを装着したり(内ダイヤフラム)、鋼管の外側にダイヤフラムを取り付けたり(外ダイヤフラム)しなければならない。また、梁に鉄骨を用いるため、鉄骨量、鉄骨加工量が増大し、コストが高くなるという問題があった。
The structure filled with concrete inside the steel pipe is called a CFT (Concrete Filled Steel Tube) structure. 2. Description of the Related Art Conventionally, there is known a ramen structure in which a column is constituted by a CFT-structure steel pipe, and a steel structure (S structure) or steel concrete structure (SC structure) such as H-shaped steel is joined to the column. When the column is made of CFT, the method of joining the beam is structurally limited. Therefore, the beam is generally made of S or SC, and a method of joining a beam using a steel frame to a CFT column is common.
When joining such a beam including a steel frame and a CFT column, a diaphragm must be mounted in the steel pipe of the CFT (inner diaphragm), or a diaphragm must be attached to the outside of the steel pipe (outer diaphragm). In addition, since a steel frame is used for the beam, there is a problem that the amount of steel frame and the amount of processing of the steel frame increase and the cost increases.

しかして、CFT造の柱に、鉄骨造(S造)又は鉄骨コンクリート造(SC造)の梁ではなく、鉄筋コンクリート造(RC造)の梁を組み合わせた構造として、特許文献1に記載のものが知られている。該特許文献1には、「コンクリートが鋼管内部に充填された一対の充填鋼管コンクリート柱体が鉄筋コンクリート構造の梁を挟んで上下に配置されていると共に、これら充填鋼管コンクリート柱体間には前記鉄筋コンクリート梁を貫通して接続筋が配設され、かつ、前記充填鋼管コンクリート柱体の鋼管端部は前記鉄筋コンクリート梁から離間されて配置され、前記接続筋は前記鋼管中に少なくとも鋼管の外径の略2倍の長さだけ埋設されていることを特徴とする柱と梁との接合部構造。」が記載されている。
また、特許文献2には、「柱鋼管内にコンクリートを充填してなる充填鋼管コンクリート造の柱と、鉄筋コンクリート造の梁とにより構成される複合構造建物における柱と梁との仕口構造であって、仕口部に前記柱鋼管と同径の仕口鋼管を同軸的に配するとともに、それら柱鋼管と仕口鋼管との間にスリットを確保して該スリットに梁主筋を通し、かつ、前記仕口鋼管およびその上下に連なる柱鋼管内に柱主筋を挿通せしめてなることを特徴とする複合構造建物における仕口構造。」が記載されている。
As a structure in which a CFT column is combined with a reinforced concrete (RC) beam instead of a steel (S) or steel-concrete (SC) beam, the structure described in Patent Document 1 is disclosed. Are known. In Patent Document 1, “a pair of filled steel pipe concrete columns filled with concrete inside a steel pipe are arranged vertically with a beam of reinforced concrete structure interposed therebetween, and the reinforced concrete is interposed between these filled steel pipe concrete columns. A connecting bar is disposed through the beam, and a steel pipe end of the filled steel pipe concrete column is arranged spaced apart from the reinforced concrete beam, and the connecting bar is at least approximately the outer diameter of the steel pipe in the steel pipe. The column-to-beam joint structure characterized by being buried by a length twice as long. "
Further, Patent Document 2 states that “a structure of a column and a beam in a composite structure building composed of a filled steel tube concrete column filled with concrete in a column steel tube and a reinforced concrete beam. The coaxial steel pipe having the same diameter as the column steel pipe in the joint part, and securing a slit between the column steel pipe and the joint steel pipe, and passing the beam main bar through the slit, and The joint structure in a composite structure building is characterized in that a column main reinforcing bar is inserted into the joint steel pipe and the column steel pipe connected to the upper and lower sides thereof.

特公平6−21467号公報Japanese Examined Patent Publication No. 6-21467 特開2000−273958号公報JP 2000-273958 A

上記特許文献1に記載のものは、充填鋼管コンクリート柱体が鉄筋コンクリート構造の梁を挟んで上下に配置されるもので、各層(階)毎に分断された鋼管の使用を前提としている。また、上記特許文献2に記載のものは、柱鋼管と仕口鋼管とを構成要素としており、同文献には、柱鋼管と同径の仕口鋼管を同軸的に配する方法など具体的な施工方法は開示されていない。また、柱鋼管と仕口鋼管との間のスリットの態様など具体的に開示されていない。さらに、上記特許文献1には、同径の柱鋼管と仕口鋼管との間に設けたスリットを通る梁主筋が開示されているが、この構成による場合、地震時に生じる、このスリットを通る梁主筋の引張力に抵抗する力が、十分でなくなるおそれがある(特に柱の太さが比較的細く設定される場合)。   The thing of the said patent document 1 is arrange | positioned up and down on both sides of the beam of a reinforced concrete structure with a filled steel pipe concrete pillar, and presupposes the use of the steel pipe divided | segmented for every layer (floor). Moreover, the thing of the said patent document 2 uses a column steel pipe and a jointed steel pipe as a component, In the same document, concrete methods, such as a method of arranging the jointed steel pipe of the same diameter as a column steel pipe, are concrete. The construction method is not disclosed. Moreover, the aspect of the slit between a column steel pipe and a jointed steel pipe is not specifically disclosed. Furthermore, although the above-mentioned Patent Document 1 discloses a beam main bar that passes through a slit provided between a column steel pipe and a jointed steel pipe having the same diameter, in this configuration, a beam that passes through this slit is generated during an earthquake. The force that resists the tensile force of the main bars may not be sufficient (especially when the column thickness is set relatively thin).

本発明は、上記従来技術を考慮してなされたものであり、複数層(階)にわたって連続した鋼管を用いた柱による施工を実現し、施工しやすく、また、鋼管内部を貫通する梁主筋の引張力に抵抗する力を確実に発揮し得る、ラーメン構造体における柱と梁との仕口構造を提供することを目的とする。   The present invention has been made in consideration of the above-described prior art, and realizes construction by a column using a steel pipe that is continuous over a plurality of layers (floors), is easy to construct, and the main beam of the beam that penetrates the inside of the steel pipe It is an object of the present invention to provide a joint structure of columns and beams in a rigid frame structure that can reliably exert a force resisting a tensile force.

(1)CFT造の柱と、鉄筋コンクリート造の梁とを接合してなり、
柱の構成部材である鋼管を、少なくとも複数階にわたり分断されることなく上下方向に連続して形成するとともに、各階の柱・梁の仕口部となる鋼管の両側面には、梁主筋を形成する鉄筋を遊挿可能な開口部を各側面に複数個づつ、対向させて穿設し、前記鉄筋を前記開口部及び前記鋼管の内部を貫通した状態で所定位置に定着した、
ラーメン構造体における柱と梁との仕口構造である。
(2)上記仕口構造において、前記鉄筋が挿通する状態で該鉄筋に取り付けられた定着プレートによって、対向する前記各開口部を塞ぐとともに、前記定着プレートの内側面を、前記鋼管の内部に充填したコンクリートと密着状態に配設したものである。
(3)上記仕口構造において、前記定着プレートは、該定着プレートの外側面に位置して前記鉄筋に螺合するナットによって所定位置に保持されるように取り付けられているものである。
(4)上記仕口構造において、前記開口部には、隣接する複数本の鉄筋が挿通して配設されるようにしたものである。
(5)上記仕口構造において、前記鋼管の内部を貫通する鉄筋は、少なくともその一方側の端部が、柱・梁の仕口部付近において、梁のスパン中間部を形成する梁主筋と機械式継手によって接合されているものである。
(6)上記仕口構造において、前記鋼管の内部を貫通する鉄筋は、前記鋼管の平面形におけるその中心部を避けた位置を通るように配設されているものである。
(1) Joined a CFT column and a reinforced concrete beam,
The steel pipes, which are the components of the columns, are continuously formed in the vertical direction without being divided over at least multiple floors, and the main beam bars are formed on both sides of the steel pipes that serve as joints for the columns and beams on each floor. A plurality of openings that can be freely inserted into each side, and drilled to face each other, the reinforcing bars fixed in place in a state of passing through the openings and the inside of the steel pipe,
It is a joint structure of columns and beams in a ramen structure.
(2) In the above-mentioned joint structure, the fixing plate attached to the reinforcing bar in a state in which the reinforcing bar is inserted closes the opposing openings, and the inner surface of the fixing plate is filled into the steel pipe. Arranged in close contact with the concrete.
(3) In the above-described joint structure, the fixing plate is attached so as to be held at a predetermined position by a nut positioned on the outer surface of the fixing plate and screwed into the reinforcing bar.
(4) In the above-described joint structure, a plurality of adjacent reinforcing bars are inserted and disposed in the opening.
(5) In the above-mentioned joint structure, the reinforcing bar penetrating the inside of the steel pipe has at least one end portion in the vicinity of the column / beam joint, and the beam main reinforcement and the machine forming the intermediate span portion of the beam It is joined by a type joint.
(6) In the above-described joint structure, the reinforcing bar penetrating the inside of the steel pipe is disposed so as to pass through a position avoiding the central portion of the planar shape of the steel pipe.

〔請求項1に係る発明〕
柱の構成部材である鋼管を、少なくとも複数階にわたり分断されることなく上下方向に連続して形成したため、複数層(階)にわたって連続した鋼管を用いて、複数層を一節として鋼管の建て方を行う効率的な施工が実現され、施工しやすい。CFT造の柱のコンクリートの打設方法として知られている、鋼管の上部からトレミー管を挿入してコンクリートを打設する方法、鋼管の下部からコンクリートを圧入して打設する方法、何れの方法を適用することもできる。また、各階の柱・梁の仕口部となる鋼管の両側面には、梁主筋を形成する鉄筋を遊挿可能な開口部を各側面に複数個づつ、対向させて穿設し、前記鉄筋を前記開口部及び前記鋼管の内部を貫通した状態で所定位置に定着したので、梁主筋の一部を形成する鉄筋を、鋼管の開口部を容易に挿通させることができるため、施工がしやすく、かつ鉄筋の定着位置の調整も容易に行うことができる。
[Invention of Claim 1]
Since the steel pipe that is a component of the pillar is formed continuously in the vertical direction without being divided at least across multiple floors, the steel pipes that are continuous over multiple layers (floors) are used, and how to build the steel pipes with multiple layers as one section Efficient construction to perform is realized and easy to construct. Any method known as a method for placing concrete in a CFT column, a method for placing concrete by inserting a tremey tube from the upper part of the steel pipe, a method for placing concrete by press-fitting concrete from the lower part of the steel pipe, Can also be applied. Also, on both sides of the steel pipe that will be the joints of the pillars and beams on each floor, a plurality of openings that can be inserted freely into the reinforcing bars that form the beam main bars are drilled facing each other. Is fixed at a predetermined position while penetrating through the opening and the inside of the steel pipe, so that the reinforcing bar forming a part of the beam main reinforcement can be easily inserted through the opening of the steel pipe, so that the construction is easy. In addition, the fixing position of the reinforcing bar can be easily adjusted.

〔請求項2に係る発明〕
鉄筋が挿通する状態で該鉄筋に取り付けられた定着プレートによって、対向する各開口部を塞ぐとともに、定着プレートの内側面を、鋼管の内部に充填したコンクリートと密着状態に配設したので、定着プレートによって簡単に開口部を閉鎖し得るとともに、鋼管内部を貫通する梁主筋の引張力に抵抗する力を定着プレートによって確実に発揮し得、耐力に優れた仕口構造が得られる。この定着プレートは、コンクリートの漏れ止めの機能も有している。
[Invention of Claim 2]
The fixing plate attached to the reinforcing bar in a state where the reinforcing bar is inserted closes each opening facing each other, and the inner side surface of the fixing plate is disposed in close contact with the concrete filled in the steel pipe. Thus, the opening can be easily closed, and a force resisting the tensile force of the beam main bar penetrating the inside of the steel pipe can be surely exhibited by the fixing plate, so that a joint structure having excellent proof stress can be obtained. This fixing plate also has a function of preventing leakage of concrete.

〔請求項3に係る発明〕
定着プレートは、該定着プレートの外側面に位置して鉄筋に螺合するナットによって所定位置に保持されるため、定着プレートを簡単かつ確実に所定位置に配設することができる。
[Invention of Claim 3]
Since the fixing plate is held at a predetermined position by a nut positioned on the outer surface of the fixing plate and screwed into the reinforcing bar, the fixing plate can be easily and reliably disposed at the predetermined position.

〔請求項4に係る発明〕
開口部には、隣接する複数本の鉄筋が挿通して配設されるようにしたので、梁主筋の一部を形成する鉄筋を、鋼管の開口部を極めて容易に挿通させることができるため、施工がとてもしやすく、鋼管の製造も簡便となる。
[Invention of Claim 4]
Since the opening is arranged so that a plurality of adjacent reinforcing bars are inserted, the reinforcing bars that form part of the beam main reinforcement can be inserted through the opening of the steel pipe very easily. The construction is very easy and the manufacture of the steel pipe is also simple.

〔請求項5に係る発明〕
鋼管の内部を貫通する鉄筋は、少なくともその一方端部が、柱・梁の接合部付近において、梁のスパン中間部を形成する梁主筋と機械式継手によって接合されているため、梁端部における施工を簡便、確実なものとすることができる。
[Invention of Claim 5]
At least one end of the reinforcing bar that penetrates the inside of the steel pipe is joined by a mechanical joint to the beam main reinforcing bar that forms the middle span of the beam in the vicinity of the column / beam joint. Construction can be simple and reliable.

〔請求項6に係る発明〕
鋼管の内部を貫通する鉄筋は、鋼管の平面形におけるその中心部を避けた位置を通るように配設されているため、鋼管内に打設するコンクリートを注入するスペースを確保することができ、施工しやすい。コンクリート打設用のトレミー管の挿入による良好な品質のコンクリートの打設が可能となる。
[Invention of Claim 6]
Since the rebar that penetrates the inside of the steel pipe is arranged so as to pass through a position that avoids the central part of the flat shape of the steel pipe, it is possible to secure a space for injecting concrete to be cast in the steel pipe, Easy to install. It is possible to place concrete of good quality by inserting a tremely pipe for placing concrete.

本発明の好ましい実施の形態を図面を参照して説明する。なお、各図において同じ要素には同じ符号を用い、適宜その説明を省略する場合がある。   Preferred embodiments of the present invention will be described with reference to the drawings. Note that the same reference numerals are used for the same elements in the drawings, and description thereof may be omitted as appropriate.

図1は実施例に係る柱と梁との仕口構造を用いて構成されたラーメン構造体の骨組の概略を示す正面図、図2は柱・梁の仕口部の正面図、図3は柱・梁の仕口部の縦断面図、図4は同横断面図である。図4において鋼管11内に充填されるコンクリートは図示省略している。図5,6は柱1の鋼管11を例示する斜視図である。   FIG. 1 is a front view showing an outline of a framework of a rigid frame structure using a column-beam joint structure according to an embodiment, FIG. 2 is a front view of a column / beam joint, and FIG. FIG. 4 is a vertical cross-sectional view of a column / beam joint, and FIG. In FIG. 4, the concrete filled in the steel pipe 11 is not shown. 5 and 6 are perspective views illustrating the steel pipe 11 of the column 1.

図1に示すように、柱1は、CFT(コンクリート充填鋼管)造であり、鉛直方向に延びる直線状の鋼管11の内部にコンクリート12を充填してなる。このCFT造の柱1と、水平方向に延びる直線状の鉄筋コンクリート造の梁2とを剛に接合してラーメン構造体が構成されている。
図1、さらに図5,6に例示するように、柱1の構成部材である鋼管11は、少なくとも複数階にわたり分断されることなく上下方向に連続して形成されており、一本の筒状体として製作されるものである。柱1(鋼管11)の平面形状は、矩形のほか、円形などとしてもよい。鋼管11の内部には、必要に応じて鉛直方向に曲げ補強鉄筋を配設してもよい。なお、図1に示したものは、梁2をプレキャストコンクリート造で構成した例を示している。
As shown in FIG. 1, the pillar 1 is made of CFT (concrete-filled steel pipe), and is formed by filling concrete 12 into a linear steel pipe 11 extending in the vertical direction. A rigid frame structure is formed by rigidly joining the CFT column 1 and a linear reinforced concrete beam 2 extending in the horizontal direction.
As illustrated in FIG. 1 and FIGS. 5 and 6, the steel pipe 11 which is a constituent member of the pillar 1 is continuously formed in the vertical direction without being divided over at least a plurality of floors, and is formed in a single cylindrical shape. It is manufactured as a body. The planar shape of the column 1 (steel pipe 11) may be a circle or the like in addition to a rectangle. Inside the steel pipe 11, you may arrange | position a bending reinforcement bar in the perpendicular direction as needed. In addition, what was shown in FIG. 1 has shown the example which comprised the beam 2 by precast concrete structure.

各階の柱・梁の仕口部となる鋼管11の両側面には、梁主筋21の一部を形成する鉄筋21aを遊挿可能な開口部13が、各側面に複数個づつ、対向するように穿設されている(図2,3,4等参照)。「梁主筋21の一部を形成する」とは、部材からみても梁21の一部をなしている場合もあるが、梁主筋21と接続されるなどして機能的に見てそのように認められるものであってもよい意味である。
図1〜5に示す例では、開口部13は、梁2との仕口部において、上下二段に設けられている。上下2段の各開口部13に、梁主筋21の一部を形成する鉄筋21aが遊挿される。各開口部13は、開口部13及び鋼管11の内部を挿通させる鉄筋21aと開口部13との間に間隙が形成されて十分な遊び得られるよう、挿通される鉄筋21aの直径よりも十分に大きく形成されている。図示の例では、各開口部13は、横長のほぼ矩形状に形成され、1本の梁2において横方向に配置される、隣接する複数の鉄筋21aが挿通される形状となっている。このため、施工の際、鉄筋21aの挿入が容易となり、特に好ましい。一の開口部13に挿通される鉄筋21aの数は限定されない。開口部13の形状や大きさは必要に応じて設定し得る。また、開口部13の数は、鋼管11の各側面に3個以上設けてもよい。
開口部13を、縦長のほぼ矩形状に形成して左右2列に配し、1本の梁2において縦方向に配置される、隣接する複数の鉄筋21a挿通される形状とするようにしてもよい(図6参照)。このほか、一の開口部13に、左右及び上下の各方向に複数の鉄筋21aが挿通されるようにしてもよい。
Openings 13 into which rebars 21a forming part of the beam main bars 21 can be loosely inserted are opposed to each side surface on each side surface of the steel pipe 11 serving as a column / beam joint on each floor. (See FIGS. 2, 3, 4 etc.). “Forming a part of the beam main bar 21” means that it may form a part of the beam 21 even when viewed from the member. This means that it may be recognized.
In the example shown in FIGS. 1 to 5, the opening 13 is provided in two upper and lower stages at the joint with the beam 2. Reinforcing bars 21a that form part of the beam main bars 21 are loosely inserted into the openings 13 in the upper and lower two stages. Each opening 13 is sufficiently larger than the diameter of the inserted reinforcing bar 21a so that a gap is formed between the opening 13 and the reinforcing bar 21a through which the inside of the opening 13 and the steel pipe 11 is inserted, and sufficient play is obtained. Largely formed. In the example shown in the drawing, each opening 13 is formed in a horizontally long and substantially rectangular shape, and has a shape in which a plurality of adjacent reinforcing bars 21 a arranged in the horizontal direction in one beam 2 are inserted. For this reason, at the time of construction, insertion of the reinforcing bar 21a becomes easy, which is particularly preferable. The number of reinforcing bars 21a inserted through one opening 13 is not limited. The shape and size of the opening 13 can be set as necessary. Further, three or more openings 13 may be provided on each side surface of the steel pipe 11.
The openings 13 are formed in a vertically long, substantially rectangular shape, arranged in two rows on the left and right sides, and arranged in a vertical direction in one beam 2 so as to be inserted into a plurality of adjacent reinforcing bars 21a. Good (see FIG. 6). In addition, a plurality of reinforcing bars 21 a may be inserted into one opening 13 in the left and right and top and bottom directions.

また、鋼管11の内部を貫通する鉄筋21aは、図示のとおり、鋼管11の平面形におけるその中心部を避けた位置を通るように配設されているものとするのが好ましい。これにより、鋼管内に打設するコンクリートを注入するスペースを確保することができ、施工しやすい。鋼管11の平面形におけるその入隅部にトレミー管を挿入可能なスペースが形成されるよう、鋼管11の平面形におけるその入隅部を避けた位置を通るように鉄筋21aを配設してもよい。なお、鋼管11の表面、例えば各開口部13の間、鋼管11の角部その他の適宜部位に、せん断力伝達用のコッタープレートなどを溶接等の手段で設けてもよい。   Moreover, it is preferable that the rebar 21a penetrating the inside of the steel pipe 11 is disposed so as to pass through a position avoiding the central portion of the planar shape of the steel pipe 11 as illustrated. Thereby, the space which inject | pours the concrete cast in a steel pipe can be ensured, and it is easy to construct. Even if the reinforcing bar 21a is disposed so as to pass through a position avoiding the corner in the planar shape of the steel pipe 11 so that a space into which the tremy tube can be inserted is formed in the corner of the planar shape of the steel pipe 11. Good. In addition, you may provide the cotter plate for shearing force transmission etc. by means, such as welding, on the surface of the steel pipe 11, for example between each opening part 13, the corner | angular part of the steel pipe 11, and other appropriate site | parts.

開口部13は、定着プレート30によって塞がれている。定着プレート30には、鉄筋21aが挿通可能な透孔31が形成されている。透孔31を鉄筋21aが挿通する状態で該鉄筋21aに取り付けられた定着プレート30によって、対向する各開口部13が塞がれている。例えば、定着プレート30は、開口部13とほぼ相似形に形成され、図7(a)に示すように、開口部13に納まる大きさか、あるいは図7(b)に示すように、開口部13よりも大きく形成され開口部13の縁部に載る態様で、開口部13を塞ぐように配設される。定着プレート30を、開口部13よりも小さい大きさに形成し、開口部13に納まるよう配設することで、定着プレート30の外縁と開口部13との間にクリアランスが形成され、このクリアランスの範囲で鉄筋21aの位置調整が可能であり、また定着プレート13の、鋼管11の表面からの突出を避け、ナット30のみの突出とすることができる(これにより耐火被覆の厚みを抑えることができる)。定着プレート30を、開口部13よりも大きく形成し開口部13の縁部に載る態様とすることで、鉄筋21aの調整代を十分に確保することができる。
図7(a)(b)は、一の開口部13を一の定着プレート30で塞ぎ、一の定着プレート30に、複数の鉄筋21aが挿通される態様を示しているが、一の開口部13を複数の定着プレート30で塞ぐ等するようにしてもよい(図7(c)(d)参照)。図7(c)は、一の定着プレート30に一の透孔31を形成して一の定着プレート30に一本の鉄筋21aが挿通される態様を示し、図7(d)は、一の定着プレート30に複数の透孔31を形成して一の定着プレート30に複数の鉄筋21aが挿通される態様を示している。
鋼管11の内部にはコンクリート12が充填されるので、定着プレート30の内側面は充填したコンクリート12と密着状態に配設されることになる。
The opening 13 is blocked by the fixing plate 30. The fixing plate 30 is formed with a through hole 31 through which the reinforcing bar 21a can be inserted. Each opposing opening 13 is closed by the fixing plate 30 attached to the reinforcing bar 21a in a state where the reinforcing bar 21a is inserted through the through hole 31. For example, the fixing plate 30 is formed in a shape substantially similar to the opening 13, and has a size that fits in the opening 13 as shown in FIG. 7A, or the opening 13 as shown in FIG. 7B. It is disposed so as to close the opening 13 in such a manner that it is larger than the opening 13 and is placed on the edge of the opening 13. The fixing plate 30 is formed in a size smaller than the opening 13 and is disposed so as to be accommodated in the opening 13, thereby forming a clearance between the outer edge of the fixing plate 30 and the opening 13. The position of the reinforcing bar 21a can be adjusted within the range, and the fixing plate 13 can be prevented from protruding from the surface of the steel pipe 11, and only the nut 30 can be protruded (this can suppress the thickness of the fireproof coating). ). By making the fixing plate 30 larger than the opening 13 and placing it on the edge of the opening 13, it is possible to sufficiently secure the adjustment margin of the reinforcing bar 21 a.
7A and 7B show a mode in which one opening 13 is closed by one fixing plate 30 and a plurality of reinforcing bars 21a are inserted into one fixing plate 30. 13 may be closed by a plurality of fixing plates 30 (see FIGS. 7C and 7D). FIG. 7C shows a mode in which one fixing hole 30 is formed in one fixing plate 30 and one reinforcing bar 21a is inserted into one fixing plate 30. FIG. In this embodiment, a plurality of through holes 31 are formed in the fixing plate 30 and a plurality of reinforcing bars 21 a are inserted into the single fixing plate 30.
Since the steel pipe 11 is filled with the concrete 12, the inner surface of the fixing plate 30 is arranged in close contact with the filled concrete 12.

また、図2〜4に明らかなとおり、定着プレート30は、該定着プレート30の外側面に位置して鉄筋21aに螺合するナット32によって所定位置に保持されるように取り付けられている。このようにして、梁主筋21の一部を形成する鉄筋21aは、柱1の鋼管11の開口部13及び鋼管11の内部を挿通した状態で確実に固定されるものとなっている。定着プレート30は、必要に応じて鋼管11と溶接してもよい。   2 to 4, the fixing plate 30 is mounted so as to be held at a predetermined position by a nut 32 that is positioned on the outer surface of the fixing plate 30 and screwed into the reinforcing bar 21 a. In this way, the reinforcing bars 21a that form part of the beam main bars 21 are securely fixed in a state of being inserted through the openings 13 of the steel pipe 11 of the column 1 and the inside of the steel pipe 11. The fixing plate 30 may be welded to the steel pipe 11 as necessary.

鋼管11の内部を貫通する鉄筋21aは、少なくともその一方側の端部が、柱・梁の仕口部付近において、梁2のスパン中間部を形成する梁主筋21と機械式継手25によって接合されているものが好ましい。図示の例では、鋼管11の内部を貫通する鉄筋21aは、その両端部が、柱・梁の仕口部付近において、梁2のスパン中間部を形成する梁主筋21と機械式継手25によって接合されている例を示している。   The reinforcing bar 21a penetrating the inside of the steel pipe 11 is joined at least at one end thereof by a mechanical joint 25 and a beam main bar 21 forming a span intermediate part of the beam 2 in the vicinity of a column / beam joint. Are preferred. In the illustrated example, the reinforcing bars 21a penetrating the inside of the steel pipe 11 are joined at both ends by a mechanical joint 25 and a beam main bar 21 forming a span intermediate part of the beam 2 in the vicinity of the column / beam joint. An example is shown.

上記した柱と梁との仕口構造における力学的メカニズムについて、図8を参照して説明する。図8における符号の説明は、次のとおりである。なお、ナット32は図示省略している。
Mb1 、Mb2 :左右の梁の曲げモーメント
Mc1 、Mc2 :下階および上階の柱の曲げモーメント
Qc1 、Qc2 :下階および上階の柱のせん断力
T1、T2:梁主筋により柱梁接合部に作用する引張力
C1、C2:梁コンクリート部により柱梁接合部に作用する圧縮力
F1、F2:柱梁接合部内の梁主筋まわりの付着抵抗力
B1、B2:定着プレートにより支圧抵抗力
A mechanical mechanism in the above-described joint structure between the column and the beam will be described with reference to FIG. The description of the symbols in FIG. 8 is as follows. The nut 32 is not shown.
Mb1, Mb2: Bending moment of left and right beams
Mc1 and Mc2: Bending moments of lower and upper columns
Qc1, Qc2: Shear force of lower and upper columns
T1, T2: Tensile force acting on the beam-column joint by the beam main reinforcement
C1, C2: Compression force acting on the beam-column joint by the beam concrete part
F1, F2: Adhesion resistance around the beam main bar in the beam-column joint
B1, B2: Supporting resistance by fixing plate

梁の曲げモーメントMb1 、Mb2 は、梁端において梁主筋の引張力T1、T2および圧縮側コンクリートの圧縮力C1、C2として柱梁接合部に作用する。
梁主筋の引張力T1、T2は、柱梁接合部内で付着抵抗力F1、F2および定着プレートによる支圧抵抗力B1、B2として伝達される。
小地震時には、付着抵抗力F1、F2が主な抵抗メカニズムであるが、大地震時には支圧抵抗力B1、B2として抵抗することになる。(仮に、定着プレートが無く、柱梁接合部内の主筋の付着抵抗力はなくなった場合には、反対側の梁の圧縮コンクリート部で反力をとることになる。)
本構造では、鋼管コンクリート(CFT)造を採用しているため、鋼管の拘束効果によって、付着抵抗力F1、F2がRC造柱の場合より大きいという利点がある。
さらに、支圧抵抗力B1、B2は、図示のように45度程度の広がりをもって作用しており、最終的に鋼管の拘束力として抵抗することになる。本構造では、拘束力が非常に大きなCFT造を用いているので、より大きな支圧抵抗力B1、B2を発揮させることが可能となる。 したがって、柱CFT造・梁RC造を可能とした本構造は、梁主筋貫通型の(柱・梁ともに)RC造の建物と比較して、耐震安全性が高いという利点を有しており、加えて、定着プレートによって鋼管の開口部を閉鎖し得るとともに、定着プレートによる支圧抵抗力B1、B2によって、鋼管内部を貫通する梁主筋の引張力に抵抗する力を確実に発揮し得、耐力に優れた仕口構造が得られる。
The bending moments Mb1 and Mb2 of the beam act on the beam-column joint as tensile forces T1 and T2 of the beam main reinforcement and compression forces C1 and C2 of the compression side concrete at the beam end.
The tensile forces T1 and T2 of the beam main bars are transmitted as adhesion resistance forces F1 and F2 and bearing resistance forces B1 and B2 by the fixing plate in the column beam joint.
At the time of a small earthquake, adhesion resistance F1, F2 is the main resistance mechanism, but at the time of a large earthquake, it will resist as bearing resistance B1, B2. (If there is no fixing plate and there is no adhesion resistance of the main reinforcement in the column beam joint, a reaction force is applied at the compression concrete part of the opposite beam.)
Since this structure employs steel pipe concrete (CFT) construction, there is an advantage that the adhesion resistance F1 and F2 are larger than those of RC pillars due to the restraining effect of the steel pipe.
Furthermore, the bearing resistance forces B1 and B2 act with a spread of about 45 degrees as shown in the figure, and finally resist as a binding force of the steel pipe. In this structure, since the CFT structure having a very large restraining force is used, it is possible to exert larger bearing resistance B1 and B2. Therefore, this structure, which enables column CFT construction and RC beam construction, has the advantage of high seismic safety compared to RC main-frame building (both pillar and beam). In addition, the fixing plate can close the opening of the steel pipe, and the bearing resistance B1 and B2 by the fixing plate can surely exert the force that resists the tensile force of the beam main bar that penetrates the inside of the steel pipe. Excellent joint structure can be obtained.

次に、本発明に係る柱と梁との仕口構造の施工方法は特に限定されるものではないが、その具体例について図9〜11を参照して説明する。図9は施工方法を例示する斜視図、図10は施工方法を説明するもので、柱・梁仕口部の横断面図である。
(1) 先ず、柱1の鋼管11を立設する(必要に応じて曲げ補強鉄筋を鋼管11内に配設してもよい)。そして、プレキャストコンクリート造の梁2を柱1,1間の所定位置に配設する。
(2) 次いで、図10(a)に示すように、鉄筋21aを開口部13から挿入し、鋼管11の内部を挿通させ、反対側の開口部13へと挿通させる。
(3) 図10(b)に示すように、挿通された鉄筋21aの両端部から、夫々、定着プレート30、ナット32、機械式継手25を取り付ける。
(4) 図10(c)に示すように、一の定着プレートに複数の鉄筋21aを通す場合は、既に取り付けた定着プレート30に、他の鉄筋21aを通して、鋼管11の内部を挿通させ、反対側の開口部13へと挿通させる。そして、ナット32、機械式継手25を取り付け、所定位置に設置する。鉄筋21aと梁2の梁主筋21とを機械式継手25によって接続する。
(5) 他の鉄筋も同様の手順で鉄筋21aと梁2の梁主筋21とを機械式継手25によって接続する。柱1で梁2が十字に交叉する場合も、同様の手順で行う。
(6) その後、梁端部及び床スラブの型枠を設置し、床配筋を行い、図9に示すようにホッパー40から柱1の鋼管11内へコンクリートを注入、打設する。さらに、梁端部及び床スラブのコンクリート打設を行う(図2に床スラブ面50,51を破線で表示)。なお、鋼管11の耐火被覆等は、適宜、通常のCFT造の柱と同様に行うことができる。
Next, although the construction method of the joint structure of the pillar and beam which concerns on this invention is not specifically limited, The specific example is demonstrated with reference to FIGS. FIG. 9 is a perspective view illustrating the construction method, and FIG. 10 is a cross-sectional view of the column / beam joint, illustrating the construction method.
(1) First, the steel pipe 11 of the column 1 is erected (bending reinforcing bars may be disposed in the steel pipe 11 as necessary). Then, a precast concrete beam 2 is disposed at a predetermined position between the columns 1 and 1.
(2) Next, as shown in FIG. 10 (a), the reinforcing bar 21a is inserted from the opening 13, the inside of the steel pipe 11 is inserted, and the opening 13 on the opposite side is inserted.
(3) As shown in FIG.10 (b), the fixing plate 30, the nut 32, and the mechanical coupling 25 are attached from the both ends of the inserted reinforcing bar 21a, respectively.
(4) As shown in FIG. 10 (c), when passing a plurality of reinforcing bars 21a through one fixing plate, the inside of the steel pipe 11 is inserted into the fixing plate 30 already attached through the other reinforcing bars 21a. It is made to pass through the opening 13 on the side. Then, the nut 32 and the mechanical joint 25 are attached and installed at a predetermined position. The reinforcing bar 21 a and the beam main bar 21 of the beam 2 are connected by a mechanical joint 25.
(5) For the other reinforcing bars, the reinforcing bar 21a and the beam main reinforcing bar 21 of the beam 2 are connected by the mechanical joint 25 in the same procedure. The same procedure is used when the beam 2 crosses the column 1 in a cross shape.
(6) After that, the beam end and floor slab formwork are installed, floor reinforcement is performed, and concrete is poured from the hopper 40 into the steel pipe 11 of the column 1 and placed as shown in FIG. Further, concrete placement of beam ends and floor slab is performed (in FIG. 2, floor slab surfaces 50 and 51 are indicated by broken lines). In addition, the fireproof coating of the steel pipe 11 can be appropriately performed in the same manner as a normal CFT column.

上記の方法のほかに、図11に示すような方法を適用することもできる。すなわち、図11(a)に示すように、柱1の鋼管11を立設した後、鋼管11を挟んで一方の側に接合すべき梁2(プレキャストコンクリート造)を所定位置に配設する。この梁2の端部にはグラウト充填式継手27が設けられている。
次いで、図11(a)に示すように、鋼管11を挟んで他方の側から梁2(プレキャストコンクリート造)を、その端部から突出した梁主筋22をやや斜め方向より鋼管11の開口部13へ挿入し、梁主筋22が鋼管11内部及び各開口部13,13を挿通した状態とする(図11(b))。
そして、挿通された梁主筋22の端部を、一方の側に配設した梁2の端部に設けたグラウト充填式継手27と接続する(図11(c))。
上記方法によれば、継手の数を半分にすることができるほか、梁主筋の挿入作業の軽減が可能である。
In addition to the above method, a method as shown in FIG. 11 can also be applied. That is, as shown in FIG. 11A, after the steel pipe 11 of the column 1 is erected, the beam 2 (precast concrete structure) to be joined to one side across the steel pipe 11 is disposed at a predetermined position. A grout filling joint 27 is provided at the end of the beam 2.
Next, as shown in FIG. 11 (a), the beam 2 (precast concrete structure) is inserted from the other side of the steel pipe 11 and the beam main bar 22 protruding from the end of the steel pipe 11 is slightly opened from the opening 13 of the steel pipe 11. The main beam 22 is inserted into the steel pipe 11 and through the openings 13 and 13 (FIG. 11B).
Then, the end portion of the inserted beam main reinforcing bar 22 is connected to the grout filling type joint 27 provided at the end portion of the beam 2 disposed on one side (FIG. 11C).
According to the above method, the number of joints can be halved, and the beam main bar insertion operation can be reduced.

以上、本発明の実施の形態を説明したが、本発明は上記の実施の形態に限定されるものではなく、本発明の要旨の範囲で種々の変形、付加等が可能である。鋼管の曲げ補強を行うため、鋼管の入隅部に鉄筋を設けたり、鋼管の表面の出隅部や又は開口部周りなどに補強プレートを溶接して設けたり、柱・梁の仕口部における鋼管の板厚を厚く形成したりすることができる。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and additions are possible within the scope of the present invention. In order to bend and reinforce steel pipes, reinforcing bars are provided at the corners of steel pipes, reinforcing plates are welded around the corners of the surface of steel pipes, or around openings, and at the joints of columns and beams. The plate thickness of the steel pipe can be increased.

実施例に係る柱と梁との仕口構造を用いて構成されたラーメン構造体の骨組の概略を示す正面図である。It is a front view which shows the outline of the framework of the rigid frame structure comprised using the joint structure of the column and beam which concerns on an Example. 柱・梁の仕口部の正面図である。It is a front view of the joint part of a pillar and a beam. 柱・梁の仕口部の縦断面図である。It is a longitudinal cross-sectional view of the joint part of a pillar and a beam. 柱・梁の仕口部の横断面図である。It is a cross-sectional view of a joint part of a column / beam. 柱1の鋼管11を例示する斜視図である。1 is a perspective view illustrating a steel pipe 11 of a column 1. 柱1の鋼管11を例示する斜視図である。1 is a perspective view illustrating a steel pipe 11 of a column 1. 定着プレート30の態様を例示する正面図である。3 is a front view illustrating an embodiment of a fixing plate 30. FIG. 本発明の力学的メカニズムの説明図である。It is explanatory drawing of the mechanical mechanism of this invention. 施工方法を説明するもので、施工態様を示す斜視図である。It is a perspective view which explains a construction method and shows a construction mode. 施工方法を説明するもので、柱・梁仕口部の横断面図である。It explains a construction method and is a cross-sectional view of a column / beam joint. 施工方法を説明するもので、施工態様を示す平面図である。It is a top view which explains a construction method and shows a construction mode.

符号の説明Explanation of symbols

1 柱
2 梁
11 鋼管
12 コンクリート
13 開口部
21 梁主筋
21a 鉄筋
22 梁主筋
25 機械式継手
30 定着プレート
32 ナット
1 Column 2 Beam 11 Steel Pipe 12 Concrete 13 Opening 21 Beam Reinforcement 21a Reinforcement 22 Beam Main Reinforcement 25 Mechanical Joint 30 Fixing Plate 32 Nut

Claims (6)

CFT造の柱と、鉄筋コンクリート造の梁とを接合してなり、
柱の構成部材である鋼管を、少なくとも複数階にわたり分断されることなく上下方向に連続して形成するとともに、各階の柱・梁の仕口部となる鋼管の両側面には、梁主筋を形成する鉄筋を遊挿可能な開口部を各側面に複数個づつ、対向させて穿設し、前記鉄筋を前記開口部及び前記鋼管の内部を貫通した状態で所定位置に定着した、
ラーメン構造体における柱と梁との仕口構造。
Joined CFT column and reinforced concrete beam,
The steel pipes, which are the components of the columns, are continuously formed in the vertical direction without being divided over at least multiple floors, and the main beam bars are formed on both sides of the steel pipes that serve as joints for the columns and beams on each floor. A plurality of openings that can be freely inserted into each side, and drilled to face each other, the reinforcing bars fixed in place in a state of passing through the openings and the inside of the steel pipe,
Joint structure of columns and beams in a ramen structure.
前記鉄筋が挿通する状態で該鉄筋に取り付けられた定着プレートによって、対向する前記各開口部を塞ぐとともに、前記定着プレートの内側面を、前記鋼管の内部に充填したコンクリートと密着状態に配設した、
請求項1に記載の、ラーメン構造体における柱と梁との仕口構造。
The fixing plate attached to the reinforcing bar is inserted in the state where the reinforcing bar is inserted, and the openings facing each other are closed, and the inner side surface of the fixing plate is disposed in close contact with the concrete filled in the steel pipe. ,
The joint structure of a column and a beam in the rigid frame structure according to claim 1.
前記定着プレートは、該定着プレートの外側面に位置して前記鉄筋に螺合するナットによって所定位置に保持されるように取り付けられている、
請求項2に記載の、ラーメン構造体における柱と梁との仕口構造。
The fixing plate is attached so as to be held at a predetermined position by a nut positioned on the outer surface of the fixing plate and screwed into the reinforcing bar.
The joint structure of a column and a beam in the rigid frame structure according to claim 2.
前記開口部には、隣接する複数本の鉄筋が挿通して配設されるようにした、
請求項1〜3のいずれかに記載の、ラーメン構造体における柱と梁との仕口構造。
In the opening, a plurality of adjacent reinforcing bars are inserted and arranged.
The joint structure of the column and the beam in the ramen structure according to any one of claims 1 to 3.
前記鋼管の内部を貫通する鉄筋は、少なくともその一方側の端部が、柱・梁の仕口部付近において、梁のスパン中間部を形成する梁主筋と機械式継手によって接合されている、 請求項1〜4のいずれかに記載の、ラーメン構造体における柱と梁との仕口構造。   The reinforcing bar penetrating the inside of the steel pipe has at least one end thereof joined by a mechanical joint with a beam main bar forming a middle span portion of the beam in the vicinity of a column / beam joint. Item 5. The joint structure of columns and beams in the ramen structure according to any one of Items 1 to 4. 前記鋼管の内部を貫通する鉄筋は、前記鋼管の平面形におけるその中心部を避けた位置を通るように配設されている、
請求項1〜5のいずれかに記載の、ラーメン構造体における柱と梁との仕口構造。
The reinforcing bar penetrating the inside of the steel pipe is disposed so as to pass through a position avoiding the central portion in the planar shape of the steel pipe.
The joint structure of the column and the beam in the ramen structure according to any one of claims 1 to 5.
JP2003364878A 2003-10-24 2003-10-24 Joint structure of column and beam in ramen structure and its construction method Expired - Fee Related JP4095534B2 (en)

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KR101089561B1 (en) 2011-04-18 2011-12-05 (주)새미르 종합건설 Jointing structure between concrete filled box type steel column and beams
CN103882995A (en) * 2014-03-19 2014-06-25 中国建筑第七工程局有限公司 Assembling type building bracket-free concrete beam steel column connecting joint
CN107060076A (en) * 2017-01-17 2017-08-18 重庆大学 A kind of rectangular steel pipe confined concrete Column border node and its construction method without stirrup
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CN115653098B (en) * 2022-11-10 2023-08-08 海南大学 Assembled reinforced concrete beam-column connection structure and construction method thereof
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