JP2016008384A - Hybrid beam - Google Patents

Hybrid beam Download PDF

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JP2016008384A
JP2016008384A JP2014127834A JP2014127834A JP2016008384A JP 2016008384 A JP2016008384 A JP 2016008384A JP 2014127834 A JP2014127834 A JP 2014127834A JP 2014127834 A JP2014127834 A JP 2014127834A JP 2016008384 A JP2016008384 A JP 2016008384A
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reinforced concrete
hole
concrete beam
reinforcing
facility
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JP6479351B2 (en
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ラヴィ シング
Singh Ravi
ラヴィ シング
仁 佐々木
Hitoshi Sasaki
仁 佐々木
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Fujita Corp
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Fujita Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure for a hybrid beam that enhances workability when reinforcing a reinforced concrete beam through which an equipment hole is opened, the hybrid beam having an equipment hole that helps mitigate damages at a time of earthquake.SOLUTION: In a reinforced range L3, a rectangular prism demarcated by an upper beam height D1 and a width of a reinforced concrete beam 10B is named a first rectangular prism C1, while a rectangular prism demarcated by a lower beam height D2 and the width of the reinforced concrete beam 10B in the reinforced range L3 as a second rectangular prism C2. The first rectangular prism C1 and the second rectangular prism C2 are assumed as separate columns, for performing design work to withstand bending and shear forces as with an ordinary reinforced concrete column, thus determining amounts of main reinforcing bars and lateral reinforcing bars 16C to 16J of the beam and concrete strength.

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。 In recent years, a beam of a composite structure composed of reinforced concrete (RC) and steel (S) structure as a beam frame of a building that makes a part of or all of a large span (hereinafter also referred to as a composite beam or a hybrid beam) 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設備用孔を有するハイブリッド梁の補強構造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. An object of the present invention is to provide a reinforcing structure of a hybrid beam having a facility hole.

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、前記鉄筋コンクリート梁部の両側面を貫通する設備用孔が形成され、前記設備用孔の周辺の前記鉄筋コンクリート梁部の箇所を補強する設備用孔補強部が設けられ、前記設備用孔補強部は、前記設備用孔を含み前記鉄筋コンクリート梁部の長手方向に沿った所定の領域で前記設備用孔の上方に位置する前記鉄筋コンクリート梁部の直方体部分と、前記設備用孔の下方に位置する前記鉄筋コンクリート梁部の直方体部分とをそれぞれ別々の鉄筋コンクリート造の柱とみなし、各直方体部分はそれぞれ前記鉄筋コンクリート造の柱として前記ハイブリット梁に作用する曲げに対する設計を行なった梁主筋および横補強筋ならびにコンクリート強度で構成されていることを特徴とする。
また、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、前記鉄筋コンクリート梁部の両側面を貫通する設備用孔が形成され、前記設備用孔の周辺の前記鉄筋コンクリート梁部の箇所を補強する設備用孔補強部が設けられ、前記設備用孔補強部は、前記設備用孔を含み前記鉄筋コンクリート梁部の長手方向に沿った所定の領域で前記設備用孔の上方に位置する前記鉄筋コンクリート梁部の直方体部分と、前記設備用孔の下方に位置する前記鉄筋コンクリート梁部の直方体部分とをそれぞれ別々の鉄筋コンクリート造の柱とみなし、各直方体部分はそれぞれ前記鉄筋コンクリート造の柱として前記ハイブリット梁に作用するせん断に対する設計を行なった梁主筋および横補強筋ならびにコンクリート強度で構成されてい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 is a steel beam portion, both ends are reinforced concrete beam portions, and the reinforced concrete is provided. The beam part is a hybrid beam comprising a plurality of beam reinforcements and a plurality of lateral reinforcement bars surrounding the beam reinforcements, and the reinforced concrete beam part is formed with equipment holes penetrating both side surfaces of the reinforced concrete beam part, An equipment hole reinforcing portion for reinforcing a portion of the reinforced concrete beam portion around the equipment hole is provided, and the equipment hole reinforcing portion includes the equipment hole and is a predetermined along the longitudinal direction of the reinforced concrete beam portion. The rectangular parallelepiped portion of the reinforced concrete beam portion located above the facility hole in the region and the straight portion of the reinforced concrete beam portion located below the facility hole. The body part is regarded as a separate reinforced concrete column, and each rectangular parallelepiped part is composed of a beam main bar and a lateral reinforcement bar and concrete strength designed for bending acting on the hybrid beam as the reinforced concrete column. It is characterized by being.
In the present invention, both ends of a steel frame spanned between opposing columns are covered with reinforced concrete, the central portion of the steel is a steel beam portion, both ends are reinforced concrete beam portions, and the reinforced concrete beam portion includes a plurality of reinforced concrete beam portions. A hybrid beam comprising beam main bars and a plurality of lateral reinforcing bars surrounding the beam main bars, wherein the reinforced concrete beam part is formed with equipment holes penetrating both side surfaces of the reinforced concrete beam part, A facility hole reinforcing portion for reinforcing a portion of the surrounding reinforced concrete beam portion is provided, and the facility hole reinforcing portion includes the facility hole in a predetermined region along a longitudinal direction of the reinforced concrete beam portion. A rectangular parallelepiped portion of the reinforced concrete beam portion located above the hole for use, and a rectangular parallelepiped portion of the reinforced concrete beam portion located below the hole for equipment, respectively. Each cuboid part is composed of a beam main bar and transverse reinforcing bars designed for shear acting on the hybrid beam as a reinforced concrete column, and a concrete strength. To do.

本発明によれば、設備用孔補強部により、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、柱としての曲げおよびせん断に対する設計を行なった梁主筋および横補強筋で補強されているので、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、設備用孔補強部により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。 According to the present invention, the shear hole cracking and the degree of damage of the reinforced concrete beam portion around the equipment hole are improved by the equipment hole reinforcing portion.
In addition, because it is reinforced with beam main bars and lateral reinforcement bars designed for bending and shearing as columns, reinforcing bar reinforcement is originally used to reinforce the reinforced concrete beam part of hybrid beams. Compared to the case, it can be easily and quickly reinforced, the workability is improved, and it is advantageous for shortening the construction period and reducing the cost.
Further, the energy of the earthquake can be absorbed by the facility hole reinforcing portion, which is advantageous in reducing the degree of damage in the event of an earthquake.

設備用孔補強部の正面図である。It is a front view of the hole reinforcement part for facilities. （Ａ）は図１のＡ矢視断面図、（Ｂ）は図１のＢ矢視断面図、（Ｃ）は図１のＢ矢視断面図で（Ｂ）の変形例である。1A is a cross-sectional view taken along arrow A in FIG. 1, FIG. 1B is a cross-sectional view taken along arrow B in FIG. 1, and FIG. 1C is a cross-sectional view taken along arrow B in FIG. 鉄筋コンクリート梁部の直方体部分を、一般的な鉄筋コンクリート造の柱として強度計算する際の説明図である。It is explanatory drawing at the time of carrying out intensity | strength calculation of the rectangular parallelepiped part of a reinforced concrete beam part as a column of a general reinforced concrete structure. 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４、図５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. 4 and FIG. 5. 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。コンクリートは、普通コンクリートでも繊維補強コンクリートでもよい。
鉄筋コンクリート梁部１０Ｂは、複数の梁主筋１４と、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。 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 concrete may be ordinary concrete or fiber reinforced concrete.
The reinforced concrete beam portion 10B is reinforced by a plurality of beam reinforcing bars 14 and a plurality of lateral 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. .

図１に示すように、設備用孔２０は、鉄筋コンクリート梁部１０Ｂの柱部１２寄りの箇所で鉄骨Ｓのウェブの中央を通るように鉄筋コンクリート梁部１０Ｂを水平に貫通している。   As shown in FIG. 1, the facility hole 20 penetrates the reinforced concrete beam portion 10B horizontally so as to pass through the center of the web of the steel frame S at a location near the column portion 12 of the reinforced concrete beam portion 10B.

図１〜図２に示すように、梁主筋１４は、鉄筋コンクリート梁部１０Ｂの上部と下部において、それぞれ鉄筋コンクリート梁部１０Ｂの幅方向に間隔をおいて複数並べられた梁主筋列１４０２として設けられている。
この梁主筋例１４０２は、設備用孔２０の上方の鉄筋コンクリート梁部１０Ｂの上部において、２つの梁主筋例１４０２が上下に間隔をおいて設けられた上梁主筋列１４０２Ａおよび下梁主筋列１４０２Ｂとして設けられている。
また、この梁主筋例１４０２は、設備用孔２０の下方の鉄筋コンクリート梁部１０Ｂの下部において、２つの梁主筋例１４０２が上下に間隔をおいて設けられた上梁主筋列１４０２Ｃおよび下梁主筋列１４０２Ｄとして設けられている。 As shown in FIGS. 1 to 2, the beam main reinforcing bars 14 are provided as beam main reinforcing bar arrays 1402 arranged at intervals in the width direction of the reinforced concrete beam 10B at the upper and lower parts of the reinforced concrete beam 10B. Yes.
This beam main bar example 1402 is an upper beam main bar row 1402A and a lower beam main bar row 1402B in which two beam main bar bars 1402 are vertically spaced apart in the upper part of the reinforced concrete beam portion 10B above the equipment hole 20. Is provided.
Further, in this beam main reinforcement example 1402, in the lower part of the reinforced concrete beam portion 10B below the equipment hole 20, an upper beam main reinforcement row 1402C and a lower beam main reinforcement row in which two beam main reinforcement examples 1402 are provided vertically apart from each other. 1402D is provided.

図１に示すように、設備用孔２０は、鉄筋コンクリート梁部１０Ｂの柱部１２寄りの箇所で鉄骨Ｓのウェブの中央を通るように鉄筋コンクリート梁部１０Ｂを水平に貫通している。   As shown in FIG. 1, the facility hole 20 penetrates the reinforced concrete beam portion 10B horizontally so as to pass through the center of the web of the steel frame S at a location near the column portion 12 of the reinforced concrete beam portion 10B.

図２（Ａ）に示すように、横補強筋１６は、柱１２と設備用孔２０との間の鉄筋コンクリート梁部１０Ｂの箇所と、設備用孔２０と鉄骨梁部１０Ａとの間の鉄筋コンクリート梁部１０Ｂの箇所では、上梁主筋列１４０２Ａと下梁主筋列１４０２Ｄの全ての梁主筋１４を囲む横補強筋１６Ａとして配置されると共に、各梁主筋列１４０２の幅方向内側の２本の梁主筋１４を囲む横補強筋１６Ｂとして配置されている。   As shown in FIG. 2 (A), the lateral reinforcing bars 16 include a reinforced concrete beam portion 10B between the column 12 and the facility hole 20, and a reinforced concrete beam between the facility hole 20 and the steel beam portion 10A. The portion 10B is arranged as a horizontal reinforcing bar 16A that surrounds all the beam main bars 14 of the upper beam main bar array 1402A and the lower beam main bar array 1402D, and two beam main bars inside the beam main bar array 1402 in the width direction. 14 is disposed as a lateral reinforcing bar 16B that surrounds 14.

また、図２（Ｂ）に示すように、横補強筋１６は、設備用孔２０の上方に位置する鉄筋コンクリート梁部１０Ｂの箇所では、上梁主筋列１４０２Ａと下梁主筋列１４０２Ｂの全ての梁主筋１４を囲む横補強筋１６Ｃとして配置されると共に、各梁主筋列１４０２Ａ、１４０２Ｂの幅方向内側の２本の梁主筋１４を囲む横補強筋１６Ｄとして配置されている。
また、横補強筋１６は、設備用孔２０の下方に位置する鉄筋コンクリート梁部１０Ｂの箇所では、図２（Ｂ）に示すように、上梁主筋列１４０２Ｃと下梁主筋列１４０２Ｄの全ての梁主筋１４を囲む横補強筋１６Ｅとして配置されると共に、各梁主筋列１４０２Ｃ、１４０２Ｄの幅方向内側の２本の梁主筋１４を囲む横補強筋１６Ｆとして配置されている。 In addition, as shown in FIG. 2B, the horizontal reinforcing bars 16 are provided at all the beams of the upper beam main reinforcing bar row 1402A and the lower beam main reinforcing bar row 1402B at the reinforced concrete beam portion 10B located above the equipment hole 20. It is arranged as a horizontal reinforcing bar 16C surrounding the main bar 14, and as a horizontal reinforcing bar 16D surrounding the two beam main bars 14 inside the beam main bar rows 1402A, 1402B in the width direction.
Further, as shown in FIG. 2 (B), the lateral reinforcing bars 16 are located in all the beams of the upper beam main bar array 1402C and the lower beam main bar array 1402D at the location of the reinforced concrete beam portion 10B located below the equipment hole 20. It is arranged as a horizontal reinforcing bar 16E that surrounds the main bar 14, and is also arranged as a horizontal reinforcing bar 16F that surrounds the two beam main bars 14 inside each beam main bar row 1402C, 1402D in the width direction.

なお、設備用孔２０の上方に位置する鉄筋コンクリート梁部１０Ｂの箇所では、図２（Ｃ）に示すように、横補強筋１６は、上梁主筋列１４０２Ａと下梁主筋列１４０２Ｂの左右４本ずつを別々に囲む横補強筋１６Ｇと、それら左右の横補強筋１６Ｇに被せる横補強筋１６Ｈで構成してもよい。同様に、設備用孔２０の下方に位置する鉄筋コンクリート梁部１０Ｂの箇所では、横補強筋１６は、上梁主筋列１４０２Ｃと下梁主筋列１４０２Ｄの左右４本ずつを別々に囲む横補強筋１６Ｉと、それら左右の横補強筋１６Ｇに被せる横補強筋１６Ｊで構成してもよい。   Note that, in the location of the reinforced concrete beam portion 10B located above the equipment hole 20, as shown in FIG. 2C, the lateral reinforcement bars 16 are four on the left and right sides of the upper beam main bar row 1402A and the lower beam main bar row 1402B. You may comprise by the horizontal reinforcement bar | burr 16G surrounding each separately, and the horizontal reinforcement bar | burr 16H which covers the horizontal reinforcement bar | burr 16G of these right and left. Similarly, at the location of the reinforced concrete beam portion 10B located below the equipment hole 20, the lateral reinforcing bars 16 are lateral reinforcing bars 16I that separately surround the left and right four main bars 1402C and 1402D. And you may comprise by the horizontal reinforcement bar | burr 16J which covers the lateral reinforcement bar | burr 16G of these right and left.

また、図１に示すように、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１６Ｋ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１６Ｋを設けることで、鉄骨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。   Further, as shown in FIG. 1, concentrated reinforcement in which the reinforcing bars of the lateral reinforcing bars 16 are densely arranged particularly at the ends corresponding to the pillar 12 side and the steel beam 10A side of the reinforced concrete beam part 10B. The muscle is 16K. In this way, by providing the concentrated reinforcing bars 16K 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 steel frame to the reinforced concrete beam portion 10B. ing.

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の箇所を補強する本発明の設備用孔補強部２２が設けられ、設備用孔補強部２２は、設備用孔２０の周辺の補強範囲に位置する梁主筋１４と横補強筋１６Ａ〜１６Ｆを含んで構成されている。
設備用孔補強部２２について詳細に説明する。
設備用孔補強部２２により補強する鉄筋コンクリート梁部１０Ｂの長手方向に沿った所定の領域すなわち補強範囲Ｌ３は次の式１で決定され、この補強範囲Ｌ３の中心に設備用孔２０の中心が位置している。
Ｌ３＝Ｌ１＋２×Ｌ２……式１。
ここでＬ１は、設備用孔２０の内径の寸法である。
また、Ｌ２は、鉄筋コンクリート梁部１０Ｂの長手方向に沿って設備用孔２０の両側で設備用孔２０の内周面からの離れた距離である。
設備用孔２０の内周面の上端から鉄筋コンクリート梁部１０Ｂの上面までの高さを上部梁せいＤ１とし、設備用孔２０の内周面の下端から鉄筋コンクリート梁部１０Ｂの下面までの高さを下部梁せいＤ２とし、上部梁せいＤ１と下部梁せいＤ２のうち大きい方の寸法を上記のＬ２とする。
補強範囲Ｌ３を大きくとると、使用される鉄筋量が増加し、配筋に手間がかかり、コストアップとなるため、必要最小限の寸法にすることが望まれる。
上記の式１を採用することで、必要最小限の寸法に近い補強範囲Ｌ３が機械的に簡単に求められる。 And the hole reinforcement part 22 for facilities of this invention which reinforces the location of the reinforced concrete beam part 10B in which the hole 20 for facilities was penetrated is provided, and the hole reinforcement part 22 for facilities is the reinforcement range around the hole 20 for equipments It is comprised including the beam main reinforcement 14 and horizontal reinforcement bars 16A-16F located in this.
The facility hole reinforcing portion 22 will be described in detail.
A predetermined region along the longitudinal direction of the reinforced concrete beam portion 10B reinforced by the facility hole reinforcing portion 22, that is, the reinforcing range L3 is determined by the following expression 1, and the center of the facility hole 20 is located at the center of the reinforcing range L3. doing.
L3 = L1 + 2 × L2 Equation 1
Here, L1 is the dimension of the inner diameter of the equipment hole 20.
L2 is a distance away from the inner peripheral surface of the equipment hole 20 on both sides of the equipment hole 20 along the longitudinal direction of the reinforced concrete beam portion 10B.
The height from the upper end of the inner peripheral surface of the facility hole 20 to the upper surface of the reinforced concrete beam portion 10B is defined as the upper beam D1, and the height from the lower end of the inner peripheral surface of the facility hole 20 to the lower surface of the reinforced concrete beam portion 10B. The lower beam is D2, and the larger dimension of the upper beam D1 and the lower beam D2 is L2.
If the reinforcing range L3 is increased, the amount of reinforcing bars to be used increases, and it takes time and effort to arrange the bars.
By adopting the above formula 1, the reinforcing range L3 close to the minimum necessary dimension can be mechanically easily obtained.

図３（Ａ）に示すように、補強範囲Ｌ３において、上部梁せいＤ１と、鉄筋コンクリート梁部１０Ｂの幅とで区画される直方体部分を第１の直方体部分Ｃ１とする。
また、補強範囲Ｌ３において、下部梁せいＤ２と、鉄筋コンクリート梁部１０Ｂの幅とで区画される長方形部分を第２の直方体部分Ｃ２とする。
そして、それら第１の直方体部分Ｃ１と第２の直方体部分Ｃ２とを別々の柱とみなし、鉄骨Ｓを考慮せずに一般的な鉄筋コンクリート造の柱と同様に曲げに対する設計を行ない、第１の直方体部分Ｃ１については図３（Ｂ）、（Ｃ）に示すように、第２の直方体部分Ｃ２については図３（Ｄ）、（Ｅ）に示すように、梁主筋１４と横補強筋１６Ａ〜１６Ｆの鉄筋量およびコンクリート強度を決定する。
あるいは、第１の直方体部分Ｃ１と第２の直方体部分Ｃ２とを別々の柱とみなし、鉄骨Ｓを考慮せずに一般的な鉄筋コンクリート造の柱と同様にせん断に対する設計を行ない、第１の直方体部分Ｃ１については図３（Ｂ）、（Ｃ）に示すように、第２の直方体部分Ｃ２については図３（Ｄ）、（Ｅ）に示すように、梁主筋１４と横補強筋１６Ａ〜１６Ｆの鉄筋量およびコンクリート強度を決定する。
ここで曲げとは、第１の直方体部分Ｃ１、第２の直方体部分Ｃ２に作用する曲げモーメントであり、ハイブリット梁１０に作用する曲げモーメントである。
また、せん断とは、第１の直方体部分Ｃ１、第２の直方体部分Ｃ２に作用するせん断力であり、ハイブリット梁１０に作用するせん断力である。 As shown in FIG. 3A, in the reinforcing range L3, a rectangular parallelepiped portion defined by the upper beam D1 and the width of the reinforced concrete beam portion 10B is defined as a first rectangular parallelepiped portion C1.
In addition, in the reinforcing range L3, a rectangular portion defined by the lower beam D2 and the width of the reinforced concrete beam portion 10B is defined as a second rectangular parallelepiped portion C2.
Then, the first rectangular parallelepiped portion C1 and the second rectangular parallelepiped portion C2 are regarded as separate columns, and the bending is designed in the same manner as a general reinforced concrete column without considering the steel frame S. The rectangular parallelepiped portion C1 is shown in FIGS. 3B and 3C, and the second rectangular parallelepiped portion C2 is shown in FIGS. 3D and 3E. Determine the amount of 16F reinforcement and concrete strength.
Alternatively, the first rectangular parallelepiped portion C1 and the second rectangular parallelepiped portion C2 are regarded as separate columns, and the design for shear is performed in the same manner as a general reinforced concrete column without considering the steel frame S. As shown in FIGS. 3B and 3C for the portion C1, as shown in FIGS. 3D and 3E for the second rectangular parallelepiped portion C2, the beam main bar 14 and the lateral reinforcing bars 16A to 16F are used. Determine the amount of reinforcing bars and concrete strength.
Here, the bending is a bending moment acting on the first rectangular parallelepiped portion C1 and the second rectangular parallelepiped portion C2, and is a bending moment acting on the hybrid beam 10.
The shear is a shearing force that acts on the first rectangular parallelepiped portion C1 and the second rectangular parallelepiped portion C2, and is a shearing force that acts on the hybrid beam 10.

本実施の形態では、設備用孔２０の上下に位置する鉄筋コンクリート梁部１０Ｂの箇所をそれぞれ別々の柱とみなし、曲げ、せん断に対する設計を行なって鉄筋量、コンクリート強度を決定し、通常の梁主筋１４、横補強筋１６、コンクリートで補強するようにしている。
そのため、一般的な鉄筋コンクリート柱のように主筋、フープ筋、コンクリート強度のみで設計施工でき、複雑な開孔補強筋を使わないため配筋が簡易に行なえ、鉄筋加工と配筋の手間を大幅に削減でき、施工性を向上してコストダウンを図る上で有利となる。 In the present embodiment, the locations of the reinforced concrete beam portions 10B located above and below the facility hole 20 are regarded as separate columns, designed for bending and shearing to determine the amount of reinforcing bars and the concrete strength, and a normal beam main bar. 14, It is made to reinforce with the horizontal reinforcement 16 and concrete.
Therefore, it can be designed and constructed only with main bars, hoop bars, and concrete strength like ordinary reinforced concrete columns, and since complex opening reinforcement bars are not used, bar arrangement can be performed easily, greatly reducing the work of reinforcing bar processing and bar arrangement. It can be reduced, which is advantageous in improving workability and reducing costs.

このように設備用孔補強部２２を構成すると、次の効果Ａ〜Ｃが発揮される。
効果Ａ：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：設備用孔補強部２２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。 Thus, if the hole reinforcement part 22 for facilities is comprised, the following effects AC will be exhibited.
Effect A: The shear crack and damage degree of the reinforced concrete beam portion 10B around the equipment hole 20 are improved.
Effect B: Compared to the case where the reinforced concrete beam 10B of the hybrid beam 10 where the reinforcing bar is originally dense is reinforced using the hole reinforcing bar, it can be easily and quickly reinforced, and the workability is improved. This is advantageous in reducing the cost and cost.
Effect C: The energy of the earthquake can be absorbed by the facility hole reinforcing portion 22, which is advantageous in reducing the degree of damage in the event of an earthquake.

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
１４０２……梁主筋列
１４０２Ａ、１４０２Ｃ……上梁主筋列
１４０２Ｂ、１４０２Ｄ……下梁主筋列
１６、１６Ａ〜１６Ｊ……横補強筋
２０……設備用孔
２２……設備用孔補強部 10 …… Hybrid beam 10A …… Steel beam portion 10B …… Reinforced concrete beam portion 14 …… Beam main bar 1402 …… Beam main bar row 1402A, 1402C …… Upper beam main bar row 1402B, 1402D …… Lower beam main bar row 16, 16A ～ 16J …… Reinforcing bars 20 …… Equipment hole 22 …… Equipment hole reinforcement

Claims (3)

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、前記鉄筋コンクリート梁部の両側面を貫通する設備用孔が形成され、
前記設備用孔の周辺の前記鉄筋コンクリート梁部の箇所を補強する設備用孔補強部が設けられ、
前記設備用孔補強部は、前記設備用孔を含み前記鉄筋コンクリート梁部の長手方向に沿った所定の領域で前記設備用孔の上方に位置する前記鉄筋コンクリート梁部の直方体部分と、前記設備用孔の下方に位置する前記鉄筋コンクリート梁部の直方体部分とをそれぞれ別々の鉄筋コンクリート造の柱とみなし、各直方体部分はそれぞれ前記鉄筋コンクリート造の柱として前記ハイブリット梁に作用する曲げに対する設計を行なった梁主筋および横補強筋ならびにコンクリート強度で構成されている、
ことを特徴とする設備用孔を有するハイブリッド梁の補強構造。 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, and the reinforced concrete beam part has a plurality of beam main bars and their beam main bars. A hybrid beam comprising a plurality of lateral reinforcement bars surrounding
In the reinforced concrete beam portion, a hole for equipment penetrating both side surfaces of the reinforced concrete beam portion is formed,
A facility hole reinforcing portion for reinforcing a portion of the reinforced concrete beam portion around the facility hole is provided,
The facility hole reinforcing portion includes a rectangular parallelepiped portion of the reinforced concrete beam portion positioned above the facility hole in a predetermined region along the longitudinal direction of the reinforced concrete beam portion including the facility hole, and the facility hole. The rectangular parallelepiped portion of the reinforced concrete beam portion positioned below the reinforced concrete beam portion is regarded as a separate reinforced concrete column, and each rectangular parallelepiped portion is designed as a reinforced concrete column for bending acting on the hybrid beam and Consists of lateral reinforcement and concrete strength,
A reinforcing structure for a hybrid beam having a hole for equipment. 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、前記鉄筋コンクリート梁部の両側面を貫通する設備用孔が形成され、
前記設備用孔の周辺の前記鉄筋コンクリート梁部の箇所を補強する設備用孔補強部が設けられ、
前記設備用孔補強部は、前記設備用孔を含み前記鉄筋コンクリート梁部の長手方向に沿った所定の領域で前記設備用孔の上方に位置する前記鉄筋コンクリート梁部の直方体部分と、前記設備用孔の下方に位置する前記鉄筋コンクリート梁部の直方体部分とをそれぞれ別々の鉄筋コンクリート造の柱とみなし、各直方体部分はそれぞれ前記鉄筋コンクリート造の柱として前記ハイブリット梁に作用するせん断に対する設計を行なった梁主筋および横補強筋ならびにコンクリート強度で構成されている、
ことを特徴とする設備用孔を有するハイブリッド梁の補強構造。 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, and the reinforced concrete beam part has a plurality of beam main bars and their beam main bars. A hybrid beam comprising a plurality of lateral reinforcement bars surrounding
In the reinforced concrete beam portion, a hole for equipment penetrating both side surfaces of the reinforced concrete beam portion is formed,
A facility hole reinforcing portion for reinforcing a portion of the reinforced concrete beam portion around the facility hole is provided,
The facility hole reinforcing portion includes a rectangular parallelepiped portion of the reinforced concrete beam portion positioned above the facility hole in a predetermined region along the longitudinal direction of the reinforced concrete beam portion including the facility hole, and the facility hole. The rectangular parallelepiped portion of the reinforced concrete beam portion located below the reinforced concrete beam portion is regarded as a separate reinforced concrete column, and each rectangular parallelepiped portion is a reinforced concrete column designed for shear acting on the hybrid beam, and Consists of lateral reinforcement and concrete strength,
A reinforcing structure for a hybrid beam having a hole for equipment. 前記設備用孔の内径の寸法をＬ１とし、前記設備用孔の内周面の上端から前記鉄筋コンクリート梁部の上面までの高さを上部梁せいＤ１とし、前記設備用孔の内周面の下端から前記鉄筋コンクリート梁部の下面までの高さを下部梁せいＤ２とし、上部梁せいＤ１と下部梁せいＤ２のうち大きい方の寸法をＬ２とすると、前記所定の領域Ｌ３は、Ｌ３＝Ｌ１＋２×Ｌ２で決定され、Ｌ３の中心に前記設備用孔の中心が位置している、
ことを特徴とする請求項１または２記載の設備用孔を有するハイブリッド梁の補強構造。 The dimension of the inner diameter of the equipment hole is L1, the height from the upper end of the inner peripheral surface of the equipment hole to the upper surface of the reinforced concrete beam part is the upper beam D1, and the lower end of the inner peripheral face of the equipment hole. When the height from the bottom to the lower surface of the reinforced concrete beam is the lower beam D2 and the larger dimension of the upper beam D1 and the lower beam D2 is L2, the predetermined region L3 is L3 = L1 + 2 × L2 The center of the hole for equipment is located at the center of L3,
3. A hybrid beam reinforcing structure having a facility hole according to claim 1 or 2.
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JP7210310B2 (en) 2019-02-08 2023-01-23 株式会社奥村組 Reinforcing structure for openings in reinforced concrete beams
JP2021113466A (en) * 2020-01-20 2021-08-05 株式会社奥村組 Hybrid beam construction method
JP2021113464A (en) * 2020-01-20 2021-08-05 株式会社奥村組 Hybrid beam structure
JP2021113465A (en) * 2020-01-20 2021-08-05 株式会社奥村組 Hybrid beam structure
JP7271454B2 (en) 2020-01-20 2023-05-11 株式会社奥村組 hybrid beam structure
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