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JP6352020B2 - Hybrid beam - Google Patents
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JP6352020B2 - Hybrid beam - Google Patents

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JP6352020B2
JP6352020B2 JP2014069402A JP2014069402A JP6352020B2 JP 6352020 B2 JP6352020 B2 JP 6352020B2 JP 2014069402 A JP2014069402 A JP 2014069402A JP 2014069402 A JP2014069402 A JP 2014069402A JP 6352020 B2 JP6352020 B2 JP 6352020B2
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reinforced concrete
concrete beam
steel
steel frame
bars
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JP2015190239A (en
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ラヴィ シング
ラヴィ シング
仁 佐々木
仁 佐々木
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Fujita Corp
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Description

本発明は、端部が鉄筋コンクリート造で中央が鉄骨造のハイブリッド梁(複合梁)に関する。   The present invention relates to a hybrid beam (composite beam) having a reinforced concrete structure at the end and a steel structure at the center.

近年、建物の一部または全部を大スパン化する建物の梁躯体として、鉄筋コンクリート(RC)と鉄骨(S)造とで構成された複合構造の梁(以下、複合梁またはハイブリッド梁とも称する)が採用されてきている。このような構造の梁は、両端部をRCで覆った鉄骨が、RC造等の柱間に架け渡されて接合されたものである。以下、ハイブリッド梁のうち、S造である中央部を鉄骨梁部、RCで覆われた両端部を鉄筋コンクリート梁部(RC梁部)と称する。
ハイブリッド梁の鉄筋コンクリート梁部においては、一般的に複数の梁主筋と、それら複数の梁主筋および鉄骨の周囲を囲む複数の横補強筋とが配筋され、鉄筋コンクリート梁部全体に渡り埋設されている。この横補強筋は、鉄筋コンクリート梁部の柱側の端部及び鉄骨梁部側の端部の配筋を密にした集中補強筋も含んでいる。
ハイブリッド梁は、中央部がS造であることから梁自重が軽減され、梁せいが減少するために梁のロングスパン化を可能とした建物が得られる新しい構法として注目されている。
2. Description of the Related Art In recent years, a composite structure beam (hereinafter also referred to as a composite beam or a hybrid beam) composed of reinforced concrete (RC) and steel (S) is used as a beam frame of a building that has a part or all of a large span. Has been adopted. The beam having such a structure is a steel frame in which both ends are covered with RC, and is spanned and joined between columns such as RC structures. Hereinafter, in the hybrid beam, the center portion made of S is referred to as a steel beam portion, and both end portions covered with RC are referred to as a reinforced concrete beam portion (RC beam portion).
In a reinforced concrete beam section of a hybrid beam, generally, a plurality of beam reinforcement bars and a plurality of beam reinforcement bars and a plurality of lateral reinforcement bars surrounding the steel frame are laid out and embedded throughout the reinforced concrete beam section. . This lateral reinforcing bar also includes a concentrated reinforcing bar in which the bar arrangement at the end of the reinforced concrete beam part and the end of the steel beam part are dense.
The hybrid beam is attracting attention as a new construction method that can reduce the beam weight and reduce the length of the beam because the center part is made of S, and that can provide a long span of the beam.

一方、ハイブリッド梁において、従来、鉄筋コンクリート梁部に設備用貫通孔を設けた例はない。
ハイブリッド梁の鉄筋コンクリート梁部は一般的なRC造として設計されており、一般的なRC造の梁に貫通孔を設けた場合、貫通孔の補強は、開孔補強筋(リング状のもの)や座屈補強筋(串形もの)などを用いて行われている。
On the other hand, in the hybrid beam, there is no example of providing the through hole for equipment in the reinforced concrete beam part.
The reinforced concrete beam part of the hybrid beam is designed as a general RC structure. When a general RC beam is provided with a through hole, the reinforcement of the through hole is an open reinforcing bar (ring-shaped one) This is done using buckling reinforcements (skewers).

特開2009−24462JP2009-24462

しかしながら、ハイブリッド梁の鉄筋コンクリート梁部を、開孔補強筋(リング状のもの)や座屈補強筋(串形もの)などを用いて補強する場合、開孔補強筋や座屈補強筋などの補強筋が過密となる。
そして、それら補強筋が過密となると、鉄筋コンクリート梁部にはもともと梁主筋と横補強筋が密に配筋されていることから、配筋するのに手間がかかり、施工性が悪くなる。
また、既往の研究例から一般的なRC造の梁の開孔を補強した場合、地震を経験したあとの開孔周りのせん断ひび割れが目立ち、梁の損傷度合いも顕著である。
この発明は以上の点に鑑みてなされたものであり、設備用孔が貫通形成された鉄筋コンクリート梁部の補強の施工性を向上でき、また、地震の際の損傷度合を軽減する上で有利なハイブリッド梁を提供することにある。
However, when the reinforced concrete beam part of the hybrid beam is reinforced with an aperture reinforcement (ring-shaped) or a buckling reinforcement (skewer), reinforcement such as an aperture reinforcement or a buckling reinforcement Muscles become overcrowded.
When these reinforcing bars are overcrowded, the beam main bars and the lateral reinforcing bars are originally densely arranged in the reinforced concrete beam portion, so that it takes time to arrange the bars and the workability deteriorates.
In addition, when the opening of a general RC beam is reinforced from past research examples, shear cracks around the opening after experiencing an earthquake are conspicuous, and the degree of damage to the beam is also remarkable.
The present invention has been made in view of the above points, and can improve the workability of reinforcement of a reinforced concrete beam portion through which a hole for equipment is formed, and is advantageous in reducing the degree of damage in the event of an earthquake. To provide hybrid beams.

上述した目的を達成するため本発明は、対向する柱間に架け渡された鉄骨の両端部を鉄筋コンクリートで覆い、前記鉄骨の中央部を鉄骨梁部とし、両端部を鉄筋コンクリート梁部とし、前記鉄筋コンクリート梁部は複数の梁主筋とそれら梁主筋を囲む複数の横補強筋とを備えるハイブリッド梁であって、前記鉄筋コンクリート梁部に前記鉄骨を貫通して設備用孔が貫通形成され、前記複数の梁主筋は、前記鉄骨の上方の前記鉄筋コンクリート梁部の上部と、前記鉄骨の下方の前記鉄筋コンクリート梁部の下部において、水平方向に並べられて設けられ、前記横補強筋は、前記柱側の前記鉄筋コンクリート梁部の端部と前記設備用孔との間の前記鉄筋コンクリート梁部の箇所と、前記鉄骨梁部側の前記鉄筋コンクリート梁部の端部と前記設備用孔との間の前記鉄筋コンクリート梁部の箇所で、前記前記鉄筋コンクリート梁部の上部と前記鉄筋コンクリート梁部の下部においてそれぞれ並べられた複数の梁主筋のうちの両端を囲むように配置されると共に、前記鉄骨の両側で前記並べられた複数の梁主筋のうちの内側に位置する2本の前記梁主筋を囲むように配置され、さらに、前記柱側の前記鉄筋コンクリート梁部の端部と前記鉄骨梁部側の前記鉄筋コンクリート梁部では、前記横補強筋の配筋を密にした集中補強筋として配置され、前記鉄筋コンクリート梁部を構成するコンクリートは、前記ハイブリット梁に作用する荷重や前記設備用孔の大きさなどに応じて決定された使用量の補強繊維を含み前記鉄筋および前記鉄骨で補強されたコンクリートと同等またはそれ以上の性能を有する繊維補強コンクリートで構成され、前記繊維補強コンクリートは、地震のエネルギーを吸収し、かつ、前記設備用孔周辺の鉄筋コンクリート梁部の箇所に作用するせん断力を負担することを特徴とする。 In order to achieve the above-mentioned object, the present invention covers both ends of a steel frame spanned between opposing columns with reinforced concrete, the central portion of the steel as a steel beam portion, and both ends as a reinforced concrete beam portion , The reinforced concrete beam part is a hybrid beam comprising a plurality of beam main bars and a plurality of lateral reinforcing bars surrounding the beam main bars , wherein the reinforced concrete beam part is formed with a hole for equipment penetrating through the steel frame , Beam main bars are arranged in a horizontal direction in the upper part of the reinforced concrete beam part above the steel frame and in the lower part of the reinforced concrete beam part below the steel frame, and the lateral reinforcing bars are arranged on the column side. The location of the reinforced concrete beam between the end of the reinforced concrete beam and the hole for the equipment, the end of the reinforced concrete beam on the side of the steel beam and the equipment The steel frame is disposed so as to surround both ends of a plurality of beam main bars arranged at the upper part of the reinforced concrete beam part and the lower part of the reinforced concrete beam part at the location of the reinforced concrete beam part between Arranged on both sides of the two beam main bars arranged inside the plurality of beam main bars arranged side by side, and further, the end of the reinforced concrete beam part on the column side and the steel beam part side In the reinforced concrete beam portion, the reinforcing bars are arranged as concentrated reinforcing bars in which the reinforcing bars of the lateral reinforcing bars are densely arranged, and the concrete constituting the reinforced concrete beam portion has a load acting on the hybrid beam and the size of the hole for the equipment. It has the same or better performance than the concrete reinforced with the reinforcing bars and the steel frame, including the amount of reinforcing fiber determined according to the That consists of a fiber reinforced concrete, the fiber reinforced concrete absorbs seismic energy, and is characterized in that bear the shearing force acting on the portion of the reinforced concrete beam portion near the plant holes.

本発明によれば、設備用孔周辺の鉄筋コンクリート梁部に作用するせん断力を、鉄筋、鉄骨で補強されたコンクリートと同等またはそれ以上の性能を有する繊維補強コンクリートが負担する。したがって設備用孔周りの鉄筋コンクリート梁部のせん断ひび割れや損傷度合いが改善される。
また、繊維補強コンクリートが設備用孔の周辺を補強するため、鉄筋の配筋がもともと過密なハイブリッド梁の鉄筋コンクリート梁部を、開孔補強筋を用いて補強する場合に比べ、簡単に迅速に確実に補強でき、施工性が改善され、工期の短縮化、コストダウンを図る上で有利となる。
また、繊維補強コンクリートで地震のエネルギーを吸収し、地震の際の損傷度合を軽減する上で有利となる。
また、設備用孔周辺の鉄筋コンクリート梁部の箇所に作用するせん断力を、鉄筋、鉄骨で補強されたコンクリートと同等またはそれ以上の性能を有する繊維補強コンクリートが負担するので、横補強筋の本数を削減可能であり、場合によっては省略することも可能となる。
According to the present invention, the fiber reinforced concrete having a performance equal to or higher than that of concrete reinforced with reinforcing bars and steel frames bears the shearing force acting on the reinforced concrete beam portion around the hole for equipment. Accordingly, the degree of shear cracking and damage of the reinforced concrete beam around the equipment hole is improved.
In addition, since fiber reinforced concrete reinforces the periphery of the hole for equipment, it is easier and faster to secure the reinforced concrete beam part of the hybrid beam, which is originally overcrowded with reinforcing bars, than when reinforcing it with an open reinforcing bar. Therefore, it is advantageous in that the workability is improved and the construction period is shortened and the cost is reduced.
In addition, the fiber-reinforced concrete absorbs earthquake energy, which is advantageous in reducing the degree of damage during the earthquake.
In addition, since the fiber reinforced concrete having the same or better performance than the steel reinforced concrete, the steel reinforced concrete, bears the shearing force acting on the reinforced concrete beam around the equipment hole. It can be reduced and may be omitted in some cases.

鉄筋コンクリート梁部の正面図である。It is a front view of a reinforced concrete beam part. 設備用孔部分の鉄筋コンクリート梁部の断面図である。It is sectional drawing of the reinforced concrete beam part of the hole part for facilities. ハイブリッド梁の概略図である。It is the schematic of a hybrid beam. ハイブリッド梁の鉄筋コンクリート梁部付近における詳細な図である。It is a detailed figure in the vicinity of the reinforced concrete beam portion of the hybrid beam.

以下、本発明の実施の形態を図示例と共に説明する。
まず、図3、図4を参照して本発明が適用される一般的なハイブリッド梁10について説明すると、ハイブリット梁10は、対向する柱12間に架け渡されたI鋼やH鋼等の鉄骨Sの両端部を鉄筋コンクリートで覆う構造のものである。
鉄骨Sの中央部は鉄骨梁部10Aとされ、両端部は鉄筋コンクリート梁部10Bとされ、鉄骨Sは内法スパン(柱フェースまでの長さ)とし柱12には貫通されておらず、図1において符号11Aはスタッドボルト、符号11Bは床スラブを示している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a general hybrid beam 10 to which the present invention is applied will be described with reference to FIG. 3 and FIG. 4. The hybrid beam 10 is a steel frame such as I steel or H steel spanned between opposing columns 12. It has a structure in which both ends of S are covered with reinforced concrete.
The central part of the steel S is a steel beam part 10A, both end parts are reinforced concrete beam parts 10B, and the steel S has an internal span (length to the column face) and does not penetrate the column 12, FIG. In FIG. 11, reference numeral 11A indicates a stud bolt, and reference numeral 11B indicates a floor slab.

鉄筋コンクリート梁部10Bは、あらかじめ工場で製作したプレキャストコンクリート製でもよく、現場打ちコンクリートで製作されてもよい。あるいはハーフプレキャストコンクリート製でもよく、この場合には、コンクリートを現場で後打ちする。
鉄筋コンクリート梁部10Bは、複数の梁主筋14、それら梁主筋14を囲む複数の横補強筋16により補強され、梁主筋14の柱梁接合部への定着は、定着金物あるいは折り曲げ定着により行われる。
また、鉄筋コンクリート梁部10Bの柱12側の端部と鉄骨梁10A側の端部に相当する部分においては、特に横補強筋16の配筋を密に配した集中補強筋16Aとしている。このように鉄筋コンクリート梁部10Bの柱12側の端部と鉄骨梁10A側の端部に相当する部分に集中補強筋16Aを設けることで、鉄筋から鉄筋コンクリート梁部10Bへの応力の伝達が図られている。
The reinforced concrete beam portion 10B may be made of precast concrete manufactured in advance in a factory, or may be manufactured of on-site concrete. Alternatively, it may be made of half precast concrete, in which case the concrete is post-struck on site.
The reinforced concrete beam portion 10B is reinforced by a plurality of beam reinforcing bars 14 and a plurality of transverse reinforcing bars 16 surrounding the beam reinforcing bars 14, and fixing of the beam reinforcing bars 14 to the column beam joint is performed by fixing hardware or bending fixing.
Further, in the portion corresponding to the end portion on the column 12 side and the end portion on the steel beam 10A side of the reinforced concrete beam portion 10B, a concentrated reinforcing bar 16A in which the reinforcing bars of the lateral reinforcing bars 16 are arranged densely. In this way, by providing the concentrated reinforcing bars 16A at the end corresponding to the column 12 side and the end on the steel beam 10A side of the reinforced concrete beam portion 10B, stress can be transmitted from the reinforcing bar to the reinforced concrete beam portion 10B. ing.

図1、図2に示すように、設備用孔20は、柱梁接合部寄りの鉄筋コンクリート梁部10Bに設けられ、鉄骨Sを貫通して鉄筋コンクリート梁部10Bを水平に貫通している。
そして、設備用孔20が貫通形成された鉄筋コンクリート梁部10Bの箇所を補強するため、鉄筋コンクリート梁部10Bに用いるコンクリートに繊維補強コンクリート24を用いている。
繊維補強コンクリート24は、コンクリートに補強繊維を複合したものであり、このような補強繊維として、設備用孔20周辺の鉄筋コンクリート梁部10Bの箇所を補強し、設備用孔20周辺の鉄筋コンクリート梁部10Bの箇所に作用するせん断力を負担できるものであればよく、例えば、鋼繊維や炭素繊維、アラミド繊維など従来公知の様々な繊維が採用可能である。補強繊維の使用量は、適用されるハイブリット梁10に作用する荷重や、設備用孔20の大きさなどに応じて適宜決定される。
As shown in FIGS. 1 and 2, the facility hole 20 is provided in the reinforced concrete beam portion 10B near the beam-column joint portion, and penetrates the steel frame S and penetrates the reinforced concrete beam portion 10B horizontally.
And in order to reinforce the location of the reinforced concrete beam part 10B in which the hole 20 for facilities was penetrated, the fiber reinforced concrete 24 is used for the concrete used for the reinforced concrete beam part 10B.
The fiber reinforced concrete 24 is a composite of reinforced fiber and concrete. The reinforced concrete beam portion 10B around the equipment hole 20 is reinforced by reinforcing the location of the reinforced concrete beam portion 10B around the equipment hole 20 as the reinforcing fiber. Any known fiber such as steel fiber, carbon fiber, and aramid fiber can be used as long as it can bear the shearing force acting on the part. The usage amount of the reinforcing fiber is appropriately determined according to the load acting on the applied hybrid beam 10, the size of the facility hole 20, and the like.

本実施の形態によれば、次の効果A〜Dが発揮される。
効果A:鉄筋コンクリート梁部10Bを構成する繊維補強コンクリート24自体が設備用孔20周辺の鉄筋コンクリート梁部10Bの箇所を補強するため、設備用孔20周りの鉄筋コンクリート梁部10Bのせん断ひび割れや損傷度合いが改善される。
効果B:鉄筋コンクリート梁部10Bに用いるコンクリートを利用して設備用孔20周辺の鉄筋コンクリート梁部10Bの箇所を補強するため、鉄筋の配筋がもともと過密なハイブリッド梁10の鉄筋コンクリート梁部10Bを、開孔補強筋を用いて補強する場合に比べ、簡単に迅速に確実に補強でき、施工性が改善され、工期の短縮化、コストダウンを図る上で有利となる。
効果C:鉄筋コンクリート梁部10Bを構成する繊維補強コンクリート24で地震のエネルギーを吸収でき、地震の際の損傷度合を軽減する上で有利となる。
効果D:設備用孔20周辺の鉄筋コンクリート梁部10Bの箇所に作用するせん断力を繊維補強コンクリート24で負担できるので、横補強筋16の本数を削減可能であり、場合によっては省略することも可能となる。
According to the present embodiment, the following effects A to D are exhibited.
Effect A: Since the fiber reinforced concrete 24 itself constituting the reinforced concrete beam portion 10B reinforces the location of the reinforced concrete beam portion 10B around the equipment hole 20, the shear crack and damage degree of the reinforced concrete beam portion 10B around the equipment hole 20 are reduced. Improved.
Effect B: In order to reinforce the location of the reinforced concrete beam portion 10B around the hole 20 for equipment using the concrete used for the reinforced concrete beam portion 10B, the reinforced concrete beam portion 10B of the hybrid beam 10 where the reinforcing bar arrangement is originally overcrowded is opened. Compared with the case of reinforcing with a hole reinforcing bar, it can be easily and quickly reinforced, the workability is improved, and it is advantageous for shortening the construction period and reducing the cost.
Effect C: The fiber reinforced concrete 24 constituting the reinforced concrete beam portion 10B can absorb the energy of the earthquake, which is advantageous in reducing the degree of damage during the earthquake.
Effect D: Since the fiber reinforced concrete 24 can bear the shearing force acting on the reinforced concrete beam portion 10B around the equipment hole 20, the number of the horizontal reinforcing bars 16 can be reduced and may be omitted in some cases. It becomes.

10……ハイブリッド梁
10A……鉄骨梁部
10B……鉄筋コンクリート梁部
14……梁主筋
16……横補強筋
20……設備用孔
24……繊維補強コンクリート
DESCRIPTION OF SYMBOLS 10 ... Hybrid beam 10A ... Steel beam part 10B ... Reinforced concrete beam part 14 ... Beam reinforcement 16 ... Lateral reinforcement 20 ... Equipment hole 24 ... Fiber reinforced concrete

Claims (1)

対向する柱間に架け渡された鉄骨の両端部を鉄筋コンクリートで覆い、前記鉄骨の中央部を鉄骨梁部とし、両端部を鉄筋コンクリート梁部とし、前記鉄筋コンクリート梁部は複数の梁主筋とそれら梁主筋を囲む複数の横補強筋とを備えるハイブリッド梁であって、
前記鉄筋コンクリート梁部に前記鉄骨を貫通して設備用孔が貫通形成され、
前記複数の梁主筋は、前記鉄骨の上方の前記鉄筋コンクリート梁部の上部と、前記鉄骨の下方の前記鉄筋コンクリート梁部の下部において、水平方向に並べられて設けられ、
前記横補強筋は、前記柱側の前記鉄筋コンクリート梁部の端部と前記設備用孔との間の前記鉄筋コンクリート梁部の箇所と、前記鉄骨梁部側の前記鉄筋コンクリート梁部の端部と前記設備用孔との間の前記鉄筋コンクリート梁部の箇所で、前記前記鉄筋コンクリート梁部の上部と前記鉄筋コンクリート梁部の下部においてそれぞれ並べられた複数の梁主筋のうちの両端を囲むように配置されると共に、前記鉄骨の両側で前記並べられた複数の梁主筋のうちの内側に位置する2本の前記梁主筋を囲むように配置され、
さらに、前記柱側の前記鉄筋コンクリート梁部の端部と前記鉄骨梁部側の前記鉄筋コンクリート梁部では、前記横補強筋の配筋を密にした集中補強筋として配置され、
前記鉄筋コンクリート梁部を構成するコンクリートは、前記ハイブリット梁に作用する荷重や前記設備用孔の大きさなどに応じて決定された使用量の補強繊維を含み前記鉄筋および前記鉄骨で補強されたコンクリートと同等またはそれ以上の性能を有する繊維補強コンクリートで構成され、
前記繊維補強コンクリートは、地震のエネルギーを吸収し、かつ、前記設備用孔周辺の鉄筋コンクリート梁部の箇所に作用するせん断力を負担する、
ことを特徴とするハイブリッド梁。
Cover both ends of the steel frame spanned between the opposing columns with reinforced concrete, the central part of the steel frame is a steel beam part, both ends are reinforced concrete beam parts , the reinforced concrete beam part is a plurality of beam main bars and their beams A hybrid beam comprising a plurality of lateral reinforcement bars surrounding the main bar ,
A hole for equipment is formed through the steel frame in the reinforced concrete beam portion,
The plurality of beam main bars are arranged in the horizontal direction at the upper part of the reinforced concrete beam part above the steel frame and at the lower part of the reinforced concrete beam part below the steel frame,
The lateral reinforcing bars include a location of the reinforced concrete beam portion between an end portion of the reinforced concrete beam portion on the column side and the facility hole, an end portion of the reinforced concrete beam portion on the steel beam portion side, and the equipment. At the location of the reinforced concrete beam part between the holes, and arranged to surround both ends of the plurality of beam main bars arranged respectively in the upper part of the reinforced concrete beam part and the lower part of the reinforced concrete beam part, It is arranged so as to surround the two beam main bars located inside the plurality of beam main bars arranged on both sides of the steel frame,
Furthermore, the end of the reinforced concrete beam part on the column side and the reinforced concrete beam part on the steel beam part side are arranged as concentrated reinforcing bars in which the reinforcement of the lateral reinforcing bars is dense,
The concrete constituting the reinforced concrete beam portion includes a reinforcing fiber of a use amount determined according to a load acting on the hybrid beam, a size of the facility hole, and the like, and reinforced with the reinforcing bar and the steel frame. Consists of fiber reinforced concrete with equal or better performance ,
The fiber reinforced concrete absorbs the energy of the earthquake and bears the shearing force acting on the location of the reinforced concrete beam portion around the equipment hole.
A hybrid beam characterized by that.
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