JP2019138136A - Structure of reinforcement concrete beam - Google Patents
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- JP2019138136A JP2019138136A JP2019013383A JP2019013383A JP2019138136A JP 2019138136 A JP2019138136 A JP 2019138136A JP 2019013383 A JP2019013383 A JP 2019013383A JP 2019013383 A JP2019013383 A JP 2019013383A JP 2019138136 A JP2019138136 A JP 2019138136A
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 142
- 230000003014 reinforcing effect Effects 0.000 claims description 131
- 239000011150 reinforced concrete Substances 0.000 claims description 76
- 239000002184 metal Substances 0.000 claims description 8
- 238000010008 shearing Methods 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 15
- 210000003205 muscle Anatomy 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OOKDYUQHMDBHMB-UHFFFAOYSA-N 3,6-dichloro-2-methoxybenzoic acid;2-(2,4-dichlorophenoxy)acetic acid;n-methylmethanamine Chemical compound CNC.CNC.COC1=C(Cl)C=CC(Cl)=C1C(O)=O.OC(=O)COC1=CC=C(Cl)C=C1Cl OOKDYUQHMDBHMB-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
Description
本発明は、開孔を挟んで上方および下方に配置される主筋とあばら筋を有する鉄筋コンクリート梁の構造に関するものである。 The present invention relates to a structure of a reinforced concrete beam having a main reinforcing bar and a stirrup arranged above and below an opening.
鉄筋コンクリート梁には、設備配管等のメンテナンスのために、作業員が通過できる開孔（人通孔）が形成されることがある。このような開孔を有する鉄筋コンクリート梁では、開孔周辺の鉄筋コンクリート強度の低下を防止する補強構造が知られている（例えば、特許文献１，非特許文献１参照）。 In the reinforced concrete beam, there are cases where an opening (human passage hole) through which an operator can pass is formed for maintenance of equipment piping and the like. In a reinforced concrete beam having such an opening, a reinforcing structure that prevents a decrease in the strength of the reinforced concrete around the opening is known (for example, see Patent Document 1 and Non-Patent Document 1).
特許文献１には、人通孔の周囲に、梁主筋に対して傾斜して配置された斜め補強筋を用いた補強構造が開示されている。これにより、人通孔の周囲においても十分な強度を得るようにしている。 Patent Document 1 discloses a reinforcing structure using an oblique reinforcing bar arranged around a person through hole and inclined with respect to the beam main bar. Thereby, sufficient strength is obtained even around the human through hole.
しかしながら、特許文献１に記載した補強構造では、複雑な形状の斜め補強筋を配筋する必要があるため、施工性が悪い、という問題がある。 However, the reinforcing structure described in Patent Document 1 has a problem that workability is poor because it is necessary to arrange diagonal reinforcing bars having a complicated shape.
一方、非特許文献１には、斜め補強筋を設けずに、弦材あばら筋を用いて開孔周囲を補強する補強構造が開示されている。 On the other hand, Non-Patent Document 1 discloses a reinforcing structure that reinforces the periphery of an opening using a chordal stirrup without providing a diagonal reinforcing bar.
しかしながら、非特許文献１には、具体的な構成は開示されていない。また、非特許文献１の記載は、長方形の開孔に限定されており、正方形や多角形や円形の開孔に対する補強構造は、開示されていない。 However, Non-Patent Document 1 does not disclose a specific configuration. Further, the description of Non-Patent Document 1 is limited to a rectangular opening, and a reinforcing structure for a square, polygonal, or circular opening is not disclosed.
そこで、本発明は、施工性に優れ、様々な形状の開孔に対応する鉄筋コンクリート梁の構造を提供することを目的としている。 Then, this invention is excellent in workability, and it aims at providing the structure of the reinforced concrete beam corresponding to the opening of various shapes.
前記目的を達成するために、本発明の鉄筋コンクリート梁の構造は、開孔を挟んで上方および下方に配置される主筋とあばら筋を有する鉄筋コンクリート梁の構造であって、前記開孔の上方および下方で、それぞれ、前記主筋より開孔側において前記鉄筋コンクリート梁の軸方向へ伸びる軸方向補強筋と、前記鉄筋コンクリート梁の軸方向において前記開孔の両側で、それぞれ、前記開孔を挟んで上方および下方に配置される前記主筋を取り囲んで配置される第１せん断補強筋と、前記開孔の周囲に、前記鉄筋コンクリート梁の軸方向に対して傾斜する斜方向補強材を備える替わりに、前記開孔の上方および下方で、それぞれ、前記主筋と前記軸方向補強筋を取り囲んで配置される第２せん断補強筋と、を備え、前記第２せん断補強筋は、第１部品と第２部品とで閉じられた形状に形成され、前記開孔の高さは、前記鉄筋コンクリート梁の梁せいの１／３より大きく、１／２以下であることを特徴とする。 In order to achieve the above object, the structure of a reinforced concrete beam according to the present invention is a structure of a reinforced concrete beam having a main bar and a stirrup arranged above and below the opening, and above and below the opening. An axial reinforcing bar extending in the axial direction of the reinforced concrete beam on the opening side from the main bar, and an upper side and a lower side of the opening in both sides of the opening in the axial direction of the reinforced concrete beam, respectively. Instead of providing a first shear reinforcement bar arranged around the main bar arranged at the center, and an oblique reinforcing member that is inclined with respect to the axial direction of the reinforced concrete beam around the opening, A second shear reinforcement bar disposed above and below and surrounding the main reinforcement bar and the axial reinforcement bar, respectively, Is formed in a part shape closed by the second part, the height of the opening is greater than 1/3 of the Sei Ryo of the reinforced concrete beam, characterized in that at 1/2 or less.
ここで、本発明の鉄筋コンクリート梁の構造は、前記開孔の高さは、前記鉄筋コンクリート梁の梁せいの１／２であってもよい。 Here, in the structure of the reinforced concrete beam of the present invention, the height of the opening may be ½ of the beam length of the reinforced concrete beam.
また、本発明の鉄筋コンクリート梁の構造は、前記第１部品および前記第２部品は、両端部が１３５度以上に折り曲げられたフック部を有し、前記フック部は、前記主筋または前記軸方向補強筋に引っ掛けられてもよい。 In the structure of the reinforced concrete beam according to the present invention, the first part and the second part each have a hook part whose both end parts are bent at 135 degrees or more, and the hook part is the main reinforcement or the axial reinforcement. It may be hooked on a line.
また、本発明の鉄筋コンクリート梁の構造では、前記開孔の上方および下方で、それぞれ、上下方向において対向する前記主筋と前記軸方向補強筋に掛け渡されて配置される中子筋を備えてもよい。 The reinforced concrete beam structure according to the present invention may further include a core bar arranged so as to span the main bar and the axial reinforcing bar facing each other in the vertical direction above and below the hole. Good.
また、本発明の鉄筋コンクリート梁の構造では、開孔を挟んで上方および下方に配置される主筋とあばら筋を有する鉄筋コンクリート梁の構造であって、前記開孔の上方および下方で、それぞれ、前記主筋より開孔側において前記鉄筋コンクリート梁の軸方向へ伸びる軸方向補強筋と、前記鉄筋コンクリート梁の軸方向において前記開孔の両側で、それぞれ、前記開孔を挟んで上方および下方に配置される前記主筋を取り囲んで配置される第１せん断補強筋と、前記開孔の周囲に、前記鉄筋コンクリート梁の軸方向に対して傾斜する斜方向補強材を備える替わりに、前記開孔の上方および下方で、それぞれ、前記主筋と前記軸方向補強筋を取り囲んで配置される、板金で形成されたせん断補強板と、を備え、前記せん断補強板は、第１部品と第２部品とで閉じられた形状に形成されることを特徴とする。 Further, in the structure of the reinforced concrete beam according to the present invention, it is a structure of a reinforced concrete beam having a main bar and a stirrup arranged above and below the opening, with the main bar above and below the hole, respectively. An axial reinforcing bar extending in the axial direction of the reinforced concrete beam on the opening side, and the main bars arranged above and below the opening on both sides of the opening in the axial direction of the reinforced concrete beam, respectively. Instead of including a first shear reinforcing bar arranged around the opening, and an oblique direction reinforcing member inclined with respect to the axial direction of the reinforced concrete beam around the opening, respectively, above and below the opening. A shear reinforcement plate formed of a sheet metal, which is disposed so as to surround the main reinforcement and the axial reinforcement, and the shear reinforcement plate includes a first part and Characterized in that it is formed in a shape closed by two parts.
このように構成された本発明の鉄筋コンクリート梁の構造では、斜方向補強材を用いないため、簡易な鉄筋コンクリート梁の構造とし、施工性を向上させることができる。また、開孔の高さは、鉄筋コンクリート梁の梁せいの１／３より大きく、１／２以下とすることで、梁せいに対する開孔のサイズを大きくすることができる。 In the structure of the reinforced concrete beam of the present invention configured as described above, since a diagonal reinforcing material is not used, the structure of the reinforced concrete beam can be simplified and workability can be improved. Moreover, the height of the opening can be increased by setting the height of the opening to be larger than 1/3 of the beam of the reinforced concrete beam and 1/2 or less.
また、本発明の鉄筋コンクリート梁の構造では、開孔の高さは、鉄筋コンクリート梁の梁せいの１／２とすることで、梁せいに対する開孔のサイズを大きくし、開孔に対する梁せいの高さを低くすることができる。 Further, in the structure of the reinforced concrete beam of the present invention, the height of the opening is set to ½ of the beam height of the reinforced concrete beam, thereby increasing the size of the opening with respect to the beam height and increasing the beam height with respect to the opening. The thickness can be lowered.
また、本発明の鉄筋コンクリート梁の構造では、第１部品および第２部品は、両端部が１３５度以上に折り曲げられたフック部を有することで、第１部品および第２部品が、主筋または軸方向補強筋にしっかりと固定され、鉄筋コンクリート梁のせん断耐力を向上させることができる。 Moreover, in the structure of the reinforced concrete beam of the present invention, the first part and the second part have hook portions bent at both ends of 135 degrees or more, so that the first part and the second part are in the main bar or axial direction. It is firmly fixed to the reinforcing bar and can improve the shear strength of the reinforced concrete beam.
また、本発明の鉄筋コンクリート梁の構造では、開孔の上方および下方で、それぞれ、上下方向において対向する主筋と軸方向補強筋に掛け渡されて配置される中子筋を備えることで、鉄筋コンクリート梁のせん断補強筋の鉄筋量をさらに容易に調整することができ、柔軟な設計に対応することができる。 Further, in the structure of the reinforced concrete beam of the present invention, the reinforced concrete beam is provided with a core bar arranged so as to be stretched over the main bar and the axial reinforcing bar facing each other in the vertical direction above and below the opening. The amount of the reinforcing bar of the shear reinforcement bar can be adjusted more easily, and a flexible design can be handled.
さらに、本発明の鉄筋コンクリート梁の構造では、第２せん断補強筋の替わりに、板金で形成されたせん断補強板を備えることで、主筋と軸方向補強筋に取り付ける部品の数を減らすことができ、施工性を向上させることができる。 Furthermore, in the structure of the reinforced concrete beam of the present invention, it is possible to reduce the number of components attached to the main reinforcing bar and the axial reinforcing bar by providing a shear reinforcing plate formed of sheet metal instead of the second shear reinforcing bar, Workability can be improved.
以下、本開示による鉄筋コンクリート梁の構造を実現する実施形態を、図面に示す実施例１および実施例２に基づいて説明する。 Hereinafter, the embodiment which realizes the structure of the reinforced concrete beam by this indication is described based on Example 1 and Example 2 shown in a drawing.
実施例１における鉄筋コンクリート梁の構造は、建物の保守・点検などを実施する際に、作業員が床下に入り込むことが可能な人通孔を有する鉄筋コンクリート造の基礎梁（地中梁）に適用される。 The structure of a reinforced concrete beam in Example 1 is applied to a reinforced concrete foundation beam (underground beam) having a through hole that allows an operator to enter the floor under maintenance and inspection of a building. The
まず、構成を説明する。
［基礎梁の構成］
図１は、実施例１の基礎の構成を説明する構成図である。図２は、実施例１の基礎梁に配筋された鉄筋の構成を説明する構成図である。図３は、実施例１の基礎梁の一般領域および開孔際領域の断面を示す断面図である。図４は、実施例１の基礎梁の開孔領域の断面を示す断面図である。図５は、実施例１のせん断補強筋を示す構成図であり、図５（ａ）が第１補強筋を示し、図５（ｂ）が第２補強筋を示し、図５（ｃ）が中子筋を示す。以下、図１〜図５に基づいて、実施例１の基礎梁の構成を説明する。
First, the configuration will be described.
[Configuration of foundation beam]
FIG. 1 is a configuration diagram illustrating a basic configuration of the first embodiment. FIG. 2 is a configuration diagram illustrating a configuration of a reinforcing bar arranged on the foundation beam according to the first embodiment. FIG. 3 is a cross-sectional view showing a cross section of a general region and a hole opening region of the foundation beam of the first embodiment. FIG. 4 is a cross-sectional view showing a cross section of the opening region of the foundation beam of the first embodiment. FIG. 5 is a block diagram showing the shear reinforcement bars of Example 1, FIG. 5 (a) shows the first reinforcement bars, FIG. 5 (b) shows the second reinforcement bars, and FIG. 5 (c). Shows the core muscle. Hereinafter, based on FIGS. 1-5, the structure of the foundation beam of Example 1 is demonstrated.
実施例１の基礎１は、図１に示すように、柱２を支える独立基礎３と、独立基礎３間を連結する鉄筋コンクリート造の基礎梁５と、で構成される。 As shown in FIG. 1, the foundation 1 of the first embodiment includes an independent foundation 3 that supports the pillar 2 and a reinforced concrete foundation beam 5 that connects the independent foundations 3.
基礎梁５の側面には、作業員が入り込むことが可能な貫通した開孔としての人通孔６が設けられる。人通孔６は、基礎梁５の軸方向で中央部に、設けられる。なお、人通孔６は、基礎梁５の軸方向で、中央部以外の場所にも設けることができ、例えば端部寄りに設けることもできる。人通孔６は、断面正方形に形成される。なお、人通孔６は、断面正方形に限定されず、断面長方形に形成されてもよいし、断面多角形に形成されてもよいし、断面円形に形成されてもよい。 A side hole of the foundation beam 5 is provided with a human through hole 6 as a through hole through which an operator can enter. The through hole 6 is provided at the center in the axial direction of the foundation beam 5. In addition, the person through-hole 6 can be provided also in places other than a center part in the axial direction of the foundation beam 5, for example, can also be provided near an edge part. The through hole 6 is formed in a square cross section. The through-hole 6 is not limited to a square cross section, and may be formed in a rectangular cross section, a polygonal cross section, or a circular cross section.
図２に示すように、基礎梁５の軸方向（図２で左右方向）において、人通孔６が設けられた領域を開孔領域Ｍ１とし、基礎梁５の軸方向において人通孔６の両側の領域を開孔際領域Ｍ２とし、その他の領域を一般領域Ｍ３とする。 As shown in FIG. 2, in the axial direction of the foundation beam 5 (left and right in FIG. 2), the region where the through hole 6 is provided is defined as an opening region M <b> 1. The regions on both sides are referred to as a hole opening region M2, and the other regions are referred to as a general region M3.
基礎梁５には、人通孔６を挟んで基礎梁５の上方および下方に配置される主筋１１と、主筋１１を取り囲んで配置されるあばら筋（スターラップ）１２と、基礎梁５の軸方向に延在して配置される軸方向補強筋１３と、基礎梁５の軸方向において人通孔６の両側に配置される第１せん断補強筋１４と、人通孔６の上方および下方に主筋１１と軸方向補強筋１３とを取り囲んで配置される第２せん断補強筋１５と、対向する主筋１１と軸方向補強筋１３に掛け渡されて配置される中子筋１８と、を備える。 The base beam 5 includes a main bar 11 disposed above and below the base beam 5 across the through hole 6, a stirrup 12 arranged around the main bar 11, and an axis of the base beam 5. Axial reinforcing bars 13 extending in the direction, first shear reinforcing bars 14 arranged on both sides of the through hole 6 in the axial direction of the foundation beam 5, and above and below the through hole 6. A second shear reinforcement bar 15 is disposed so as to surround the main bar 11 and the axial direction reinforcing bar 13, and a core bar 18 is provided so as to be stretched over the opposing main bar 11 and the axial direction reinforcing bar 13.
あばら筋１２と、第１せん断補強筋１４と、第２せん断補強筋１５と、中子筋１８とは、基礎梁５のせん断補強筋として機能する。主筋１１と、あばら筋１２と、軸方向補強筋１３と、第１せん断補強筋１４と、第２せん断補強筋１５とは、例えばＤ１３の異形鋼棒を使用する。 The stirrup 12, the first shear reinforcement 14, the second shear reinforcement 15, and the core reinforcement 18 function as the shear reinforcement of the foundation beam 5. For example, the deformed steel bar of D13 is used for the main reinforcement 11, the stirrup 12, the axial reinforcing bar 13, the first shear reinforcing bar 14, and the second shear reinforcing bar 15.
主筋１１は、図２〜４に示すように、人通孔６を挟んで基礎梁５の上部と下部に、基礎梁５の軸方向の全域にわたって設置される。上部の主筋１１と下部の主筋１１は、基礎梁５の幅方向に等間隔で４本並んで、上下方向に２列になって配置される。 As shown in FIGS. 2 to 4, the main bars 11 are installed over the entire area in the axial direction of the foundation beam 5 on the upper and lower sides of the foundation beam 5 with the person passage hole 6 interposed therebetween. The upper main bar 11 and the lower main bar 11 are arranged in four rows at equal intervals in the width direction of the foundation beam 5 and in two rows in the vertical direction.
あばら筋１２は、上部の主筋１１および下部の主筋１１の外周を取り囲んで配置される。あばら筋１２は、一般領域Ｍ３に、所定のピッチＰ１で複数配置される。あばら筋１２は、主筋１１に、例えば結束線などによって拘束される。 The stirrup 12 is arranged so as to surround the outer periphery of the upper main bar 11 and the lower main bar 11. A plurality of the streaks 12 are arranged at a predetermined pitch P1 in the general region M3. The streaked muscle 12 is constrained to the main muscle 11 by, for example, a binding line.
軸方向補強筋１３は、人通孔６の上方と下方で、それぞれ、主筋１１より人通孔６側に設置される。軸方向補強筋１３は、基礎梁５の幅方向に等間隔で４本並んで配置される。軸方向補強筋１３は、人通孔６を中心として左右に、開孔領域Ｍ１から、開孔際領域Ｍ２を経て、一般領域Ｍ３に及ぶように、基礎梁５の軸方向に延在して配置される。上方の軸方向補強筋１３の両端部１３ａは、一般領域Ｍ３で、垂直下方に折り曲げられ、定着長さを確保している。下方の軸方向補強筋１３の両端部１３ａは、一般領域Ｍ３で、垂直上方に折り曲げられ、定着長さを確保している。 The axial reinforcing bars 13 are installed on the side of the human through hole 6 from the main bar 11 above and below the human through hole 6, respectively. Four axial reinforcing bars 13 are arranged side by side at equal intervals in the width direction of the foundation beam 5. The axial reinforcing bar 13 extends in the axial direction of the foundation beam 5 so as to extend from the opening region M1 to the general region M3 from the opening region M1 to the general region M3 from side to side with respect to the through hole 6. Be placed. Both end portions 13a of the upper axial reinforcing bar 13 are bent vertically downward in the general region M3 to ensure a fixing length. Both end portions 13a of the lower axial reinforcing bar 13 are bent vertically upward in the general region M3 to ensure a fixing length.
第１せん断補強筋１４は、基礎梁５の軸方向において人通孔６の両側の開孔際領域Ｍ２にそれぞれ配置される。第１せん断補強筋１４は、上部の主筋１１および下部の主筋１１の外周を取り囲んで配置される。第１せん断補強筋１４は、開孔際領域Ｍ２に、あばら筋１２のピッチＰ１より狭いピッチＰ２で、例えば４つ配置される。第１せん断補強筋１４は、主筋１１に、例えば結束線などによって拘束される。 The first shear reinforcing bars 14 are respectively disposed in the opening area M <b> 2 on both sides of the through hole 6 in the axial direction of the foundation beam 5. The first shear reinforcing bar 14 is disposed so as to surround the outer periphery of the upper main bar 11 and the lower main bar 11. For example, four first shear reinforcement bars 14 are arranged in the opening area M2 at a pitch P2 narrower than the pitch P1 of the ribs 12. The first shear reinforcing bar 14 is constrained to the main bar 11 by, for example, a binding line.
第２せん断補強筋１５は、人通孔６の上方と下方に配置される。なお、上方の第２せん断補強筋１５と、下方の第２せん断補強筋１５とは、対称形状であるため、上方の第２せん断補強筋１５について説明し、下方の第２せん断補強筋１５についての説明を省略する。 The second shear reinforcing bars 15 are disposed above and below the person passage hole 6. Since the upper second shear reinforcement bar 15 and the lower second shear reinforcement bar 15 are symmetrical, the upper second shear reinforcement bar 15 will be described and the lower second shear reinforcement bar 15 will be described. The description of is omitted.
上方の第２せん断補強筋１５は、開孔領域Ｍ１に、あばら筋１２のピッチＰ１より狭いピッチＰ３で、例えば、７つ配置される。上方の第２せん断補強筋１５のピッチＰ３は、第１せん断補強筋１４のピッチＰ２と、同じピッチとするが、ピッチＰ３をピッチＰ２より狭くしてもよいし、広くしてもよい。 For example, seven upper second shear reinforcement bars 15 are arranged in the opening region M1 at a pitch P3 narrower than the pitch P1 of the ribs 12. The pitch P3 of the upper second shear reinforcement bar 15 is the same as the pitch P2 of the first shear reinforcement bar 14, but the pitch P3 may be narrower or wider than the pitch P2.
上方の第２せん断補強筋１５は、図４に示すように、第１部品としての第１補強筋１６と、第１補強筋１６と一対となる第２部品としての第２補強筋１７と、から構成される。 As shown in FIG. 4, the upper second shear reinforcing bar 15 includes a first reinforcing bar 16 as a first part, a second reinforcing bar 17 as a second part paired with the first reinforcing bar 16, and Consists of
第１補強筋１６は、図５（ａ）に示すように、本体部１６ａと、本体部１６ａの両端部から本体部１６ａに対して同じ側に直角に折れ曲がって延在する延在部１６ｂと、延在部１６ｂの端部から互いに対向するように１３５度に折れ曲がるフック部１６ｃと、を備える。第２補強筋１７は、図５（ｂ）に示すように、本体部１７ａと、本体部１７ａの両端部から本体部１７ａに対して同じ側に１３５度に折れ曲がるフック部１７ｃと、を備える。 As shown in FIG. 5 (a), the first reinforcing bar 16 includes a main body portion 16a, and an extending portion 16b extending from the both end portions of the main body portion 16a at a right angle with respect to the main body portion 16a. The hook portion 16c is bent at 135 degrees so as to face each other from the end portion of the extending portion 16b. As shown in FIG. 5B, the second reinforcing bar 17 includes a main body portion 17a and a hook portion 17c that bends at 135 degrees from both ends of the main body portion 17a to the same side with respect to the main body portion 17a.
第１補強筋１６は、図４に示すように、最外周に配置された主筋１１を取り囲み、フック部１６ｃが、基礎梁５の幅方向（図４で左右方向）で外側の軸方向補強筋１３に引っ掛けられる。 As shown in FIG. 4, the first reinforcing bar 16 surrounds the main reinforcing bar 11 disposed on the outermost periphery, and the hook portion 16 c is an outer axial reinforcing bar in the width direction of the foundation beam 5 (left and right direction in FIG. 4). 13 is hooked.
第２補強筋１７は、上方の軸方向補強筋１３を下方から支持するように配置され、フック部１７ｃが、基礎梁５の幅方向で外側の軸方向補強筋１３に引っ掛けられる。これにより、第１補強筋１６と第２補強筋１７とは、一対となって、閉じられた形状を形成する。すなわち、第２せん断補強筋１５は、人通孔６の上方および下方で、それぞれ、主筋１１と軸方向補強筋１３を取り囲んで配置される。 The second reinforcing bar 17 is disposed so as to support the upper axial reinforcing bar 13 from below, and the hook portion 17 c is hooked on the outer axial reinforcing bar 13 in the width direction of the foundation beam 5. Accordingly, the first reinforcing bar 16 and the second reinforcing bar 17 are paired to form a closed shape. In other words, the second shear reinforcing bars 15 are disposed above and below the through hole 6 so as to surround the main reinforcing bars 11 and the axial reinforcing bars 13, respectively.
さらに、第３せん断補強筋としての中子筋１８を第２せん断補強筋１５の間に備えてもよい。中子筋１８は、図５（ｃ）に示すように、本体部１８ａと、本体部１８ａの両端部から本体部１８ａに対して同じ側に１３５度に折れ曲がるフック部１８ｃと、を備える。中子筋１８は、例えばＤ１３の異形鋼棒を使用する。 Further, a core bar 18 as a third shear reinforcement bar may be provided between the second shear reinforcement bars 15. As shown in FIG.5 (c), the core muscle 18 is provided with the main-body part 18a and the hook part 18c bent at 135 degree | times from the both ends of the main-body part 18a to the same side with respect to the main-body part 18a. For example, a deformed steel bar of D13 is used as the core bar 18.
中子筋１８は、図４に示すように、上方に配置された１つの主筋１１と、基礎梁５の上下方向において、この１つの主筋１１に対向する１つの軸方向補強筋１３と、に掛け渡されて配置される。中子筋１８は、基礎梁５の幅方向で、最外側の主筋１１より内側の主筋１１と、最外側の軸方向補強筋１３より内側の軸方向補強筋１３と、を支持するように配置される。なお、中子筋１８は、複数配置されてもよい。 As shown in FIG. 4, the core bar 18 includes one main reinforcing bar 11 disposed above and one axial reinforcing bar 13 facing the one main reinforcing bar 11 in the vertical direction of the foundation beam 5. Arranged over. The core bars 18 are arranged so as to support the main bars 11 inside the outermost main bars 11 and the axial reinforcing bars 13 inside the outermost axial reinforcing bars 13 in the width direction of the foundation beam 5. Is done. A plurality of core muscles 18 may be arranged.
人通孔６の高さＨ１は、図４に示すように、梁せいＨ２の１／２とする。なお、人通孔６の高さＨ１は、梁せいＨ２の１／３より大きく、梁せいＨ２の１／２以下とすることもできる。 As shown in FIG. 4, the height H1 of the through hole 6 is set to 1/2 of the beam length H2. It should be noted that the height H1 of the through hole 6 may be greater than 1/3 of the beam length H2 and less than or equal to 1/2 of the beam length H2.
［基礎梁の構造の実験結果］
次に、実施例１の基礎梁５の構造の効果を確認するために行った実験及びその結果について説明する。図６は、実施例１の基礎梁５の構造を、中央部に人通孔６を有する基礎梁５に適用したものについて行った実験について説明する説明図であり、図６（ａ）は実験後の基礎梁５の状態を示し、図６（ｂ）は実験結果の荷重−変形関係グラフを示す。図７は、実施例１の基礎梁５の構造を、端部寄りに人通孔６を有する基礎梁５に適用したものについて行った実験について説明する説明図であり、図７（ａ）は実験後の基礎梁５の状態を示し、図７（ｂ）は実験結果の荷重−変形関係グラフを示す。図８は、人通孔を設けない基礎梁５’について行った実験について説明する説明図であり、図８（ａ）は実験後の基礎梁５’の状態を示し、図８（ｂ）は実験結果の荷重−変形関係グラフを示す。
[Experimental results of foundation beam structure]
Next, an experiment conducted to confirm the effect of the structure of the foundation beam 5 of Example 1 and the result thereof will be described. FIG. 6 is an explanatory diagram for explaining an experiment conducted on the structure of the foundation beam 5 of Example 1 applied to the foundation beam 5 having the through hole 6 in the center, and FIG. FIG. 6B shows a load-deformation relationship graph of the experimental results. FIG. 7 is an explanatory diagram for explaining an experiment conducted on the structure of the foundation beam 5 of Example 1 applied to the foundation beam 5 having the through hole 6 near the end, and FIG. The state of the foundation beam 5 after the experiment is shown, and FIG. 7B shows a load-deformation relation graph of the experiment result. FIG. 8 is an explanatory diagram for explaining an experiment performed on a foundation beam 5 ′ without a through hole. FIG. 8A shows a state of the foundation beam 5 ′ after the experiment, and FIG. The load-deformation relationship graph of an experimental result is shown.
この実験では、各試験体に正負交互に変化するせん断荷重を作用させて、せん断力−部材角（相対変位）の関係及び載荷後の破壊状況について調べた。 In this experiment, a shear load that alternately changes between positive and negative was applied to each specimen, and the relationship between shear force and member angle (relative displacement) and the fracture state after loading were examined.
実施例１の基礎梁５の構造を、中央部に人通孔６を有する基礎梁５に適用した場合、図６（ｂ）に示すように、所定の性能を示す荷重変形の結果となった。また、図６（ａ）に示すように、実験後の基礎梁５は、開孔領域Ｍ１以外の場所で破壊していることが分かる。 When the structure of the foundation beam 5 of Example 1 was applied to the foundation beam 5 having the through hole 6 in the center, as shown in FIG. 6B, the result of load deformation showing a predetermined performance was obtained. . Moreover, as shown to Fig.6 (a), it turns out that the foundation beam 5 after an experiment is destroyed in places other than the opening area | region M1.
実施例１の基礎梁５の構造を、端部寄りに人通孔６を有する基礎梁５に適用した場合、図７（ｂ）に示すように、所定の性能を示す荷重変形の結果となった。また、図７（ａ）に示すように、実験後の基礎梁５は、開孔領域Ｍ１以外の場所で破壊していることが分かる。 When the structure of the foundation beam 5 of Example 1 is applied to the foundation beam 5 having the through hole 6 near the end, as shown in FIG. 7B, the result of load deformation showing a predetermined performance is obtained. It was. Moreover, as shown to Fig.7 (a), it turns out that the foundation beam 5 after an experiment is destroyed in places other than the opening area | region M1.
開孔を設けない基礎梁５’の場合、図８（ｂ）に示すように、所定の性能を示す荷重変形の結果となった。また、図８（ａ）に示すように、実験後の基礎梁５’は、基礎梁５’の端部付近で破壊していることが分かる。 In the case of the foundation beam 5 ′ not provided with an opening, as shown in FIG. 8B, the result of load deformation showing a predetermined performance was obtained. Further, as shown in FIG. 8A, it can be seen that the foundation beam 5 'after the experiment is broken near the end of the foundation beam 5'.
以上の実験結果により、実施例１の基礎梁５の構造を有する場合、開孔領域Ｍ１以外の場所が破壊していることが分かる。また、実施例１の基礎梁５の構造を有する場合は、人通孔を有しない基礎梁５’と同程度の荷重変形の性能を有することが分かる。 From the above experimental results, it can be seen that, in the case of having the structure of the foundation beam 5 of Example 1, a place other than the aperture region M1 is broken. Moreover, when it has the structure of the foundation beam 5 of Example 1, it turns out that it has the performance of a load deformation | transformation comparable as the foundation beam 5 'which does not have a through hole.
次に、従来の基礎梁の構造に使用されている斜方向補強材について説明する。従来から、基礎梁の構造には、開孔の周囲に、基礎梁の軸方向に対して傾斜する斜方向補強材としての斜め筋や、既製補強金物が使用されている。斜め筋は、一般的に、開孔の周囲に、基礎梁の軸方向に対して傾斜して複数配置される。既製補強金物は、一般的に、開孔の周囲に、円形や多角形の閉鎖型配筋として形成される。 Next, the diagonal reinforcement used for the structure of the conventional foundation beam is demonstrated. Conventionally, in the structure of the foundation beam, oblique streaks as oblique reinforcement members that are inclined with respect to the axial direction of the foundation beam and ready-made reinforcement hardware are used around the openings. In general, a plurality of oblique stripes are arranged around the aperture and inclined with respect to the axial direction of the foundation beam. The ready-made reinforcement hardware is generally formed as a circular or polygonal closed bar arrangement around the opening.
次に、作用を説明する。
実施例１の鉄筋コンクリート梁の構造では、開孔（人通孔６）を挟んで上方および下方に配置される主筋１１とあばら筋１２を有する。この鉄筋コンクリート梁（基礎梁５）の構造において、開孔（人通孔６）の上方および下方で、それぞれ、主筋１１より開孔（人通孔６）側において鉄筋コンクリート梁（基礎梁５）の軸方向へ伸びる軸方向補強筋１３と、鉄筋コンクリート梁（基礎梁５）の軸方向において開孔（人通孔６）の両側で、それぞれ、開孔（人通孔６）を挟んで上方および下方に配置される主筋１１を取り囲んで配置される第１せん断補強筋１４と、開孔（人通孔６）の周囲に、鉄筋コンクリート梁（基礎梁５）の軸方向に対して傾斜する斜方向補強材を備える替わりに、開孔（人通孔６）の上方および下方で、それぞれ、主筋１１と軸方向補強筋１３を取り囲んで配置される第２せん断補強筋１５と、を備える。第２せん断補強筋１５は、第１部品（第１補強筋１６）と第２部品（第２補強筋１７）とで閉じられた形状に形成される。開孔（人通孔６）の高さＨ１は、鉄筋コンクリート梁（基礎梁５）の梁せいＨ２の１／３より大きく、１／２以下である（図２）。
Next, the operation will be described.
In the structure of the reinforced concrete beam of Example 1, it has the main reinforcement 11 and the stirrup 12 arrange | positioned above and below on both sides of an opening (person passage hole 6). In the structure of this reinforced concrete beam (foundation beam 5), the shaft of the reinforced concrete beam (foundation beam 5) is located above and below the opening (through hole 6) on the side of the opening (through hole 6) from the main bar 11, respectively. On the both sides of the opening (person passage hole 6) in the axial direction of the axial reinforcing bar 13 extending in the direction and the reinforced concrete beam (base beam 5), respectively, upward and downward with the opening (person passage hole 6) in between An oblique reinforcing member that is inclined with respect to the axial direction of the reinforced concrete beam (base beam 5) around the first shear reinforcing bar 14 that is disposed to surround the main bar 11 that is disposed and the opening (the through hole 6). The second shear reinforcement bar 15 is provided above and below the opening (person passage hole 6), and the second shear reinforcement bar 15 is disposed so as to surround the main reinforcement bar 11 and the axial reinforcement bar 13, respectively. The 2nd shear reinforcement 15 is formed in the shape closed by the 1st part (1st reinforcement 16) and the 2nd part (2nd reinforcement 17). The height H1 of the opening (person through hole 6) is greater than 1/3 and less than or equal to 1/2 of the beam length H2 of the reinforced concrete beam (foundation beam 5) (FIG. 2).
これにより、斜方向補強材を用いなくても、鉄筋コンクリート梁（基礎梁５）の開孔（人通孔６）の周囲の強度を維持することができる。そのため、鉄筋コンクリート梁（基礎梁５）を簡易な構造とし、施工性を向上させることができる。 Thereby, the intensity | strength of the circumference | surroundings of the opening (person passage hole 6) of a reinforced concrete beam (foundation beam 5) can be maintained, without using a diagonal reinforcement material. Therefore, a reinforced concrete beam (foundation beam 5) can be made into a simple structure, and workability can be improved.
ところで、鉄筋コンクリート梁の開孔の補強に関して、開孔径は、梁せいの１／３以下とすることが一般的である（参考文献：コーリョー建販株式会社（１９９６年）ダイヤレン技術マニュアル ｐｐ．１７）。 By the way, regarding the reinforcement of the opening of the reinforced concrete beam, the diameter of the opening is generally set to 1/3 or less of the length of the beam (reference: Koryo Kensho Co., Ltd. (1996) Dialen Technical Manual pp.17). .
一方、実施例１では、開孔（人通孔６）の高さＨ１は、鉄筋コンクリート梁（基礎梁５）の梁せいＨ２の１／３より大きく、１／２以下とすることができる。そのため、梁せいＨ２に対する開孔（人通孔６）のサイズを大きくすることができる。その結果、開孔（人通孔６）は、作業員が通過できる人通孔としてだけでなく、設備配管用の開孔を兼ねることができる。すなわち、人通孔用の開孔の他に設備配管用の開孔を別途設けることを省くことができる。また、開孔（人通孔６）に対する梁せいＨ２の高さを低くすることができる。 On the other hand, in Example 1, the height H1 of the opening (person passage hole 6) can be set to be larger than 1/3 and less than or equal to 1/2 of the beam length H2 of the reinforced concrete beam (foundation beam 5). Therefore, it is possible to increase the size of the opening (person passage hole 6) for the beam H2. As a result, the opening (human through hole 6) can serve not only as a human through hole through which an operator can pass but also as an opening for facility piping. That is, it is possible to omit the provision of an opening for equipment piping in addition to the opening for human passage. In addition, the height of the beam H2 with respect to the opening (person passage hole 6) can be reduced.
ところで、鉄筋コンクリート梁に矩形の開孔を形成するためには、安全側配慮として円形開孔に内接する矩形の開孔とすることが一般的である（参考文献：コーリョー建販株式会社（１９９６年）ダイヤレン技術マニュアル ｐｐ．１７）。 By the way, in order to form a rectangular opening in a reinforced concrete beam, it is common to use a rectangular opening inscribed in the circular opening as a safety consideration (reference: Koryo Kensei Co., Ltd. (1996). ) Dialen Technical Manual, pp. 17).
実施例１では、円形開孔に外接する矩形の開孔とすることができる。そのため、実施例１の鉄筋コンクリート梁（基礎梁５）、大きな開孔を形成することができる。 In the first embodiment, a rectangular opening circumscribing the circular opening may be used. Therefore, the reinforced concrete beam (foundation beam 5) of Example 1 and a large opening can be formed.
また、第１せん断補強筋１４および第２せん断補強筋１５の配置ピッチを容易に調整することができる。そのため、鉄筋コンクリート梁（基礎梁５）の開孔（人通孔６）の周囲のせん断補強筋の鉄筋量を容易に調整可能とし、開孔（人通孔６）の形状を、矩形、多角形、円形など様々な形状に適用させることができる。また、開孔（人通孔６）を、鉄筋コンクリート梁（基礎梁５）の中央部や端部など自由な位置に設置することができる。 Further, the arrangement pitch of the first shear reinforcement bars 14 and the second shear reinforcement bars 15 can be easily adjusted. Therefore, it is possible to easily adjust the amount of the reinforcing bar of the shear reinforcement around the opening (human passage 6) of the reinforced concrete beam (foundation beam 5), and the shape of the opening (human passage 6) is rectangular or polygonal. It can be applied to various shapes such as a circle. Moreover, an opening (person through-hole 6) can be installed in free positions, such as the center part and edge part of a reinforced concrete beam (foundation beam 5).
実施例１の鉄筋コンクリート梁の構造では、開孔（人通孔６）の高さＨ１は、鉄筋コンクリート梁（基礎梁５）の梁せいＨ２の１／２である（図２）。 In the structure of the reinforced concrete beam of Example 1, the height H1 of the opening (person passage hole 6) is ½ of the beam height H2 of the reinforced concrete beam (foundation beam 5) (FIG. 2).
これにより、梁せいＨ１に対する開孔（人通孔６）のサイズを大きくすることができ、開孔（人通孔６）に対する梁せいＨ１の高さを低くすることができる。 Thereby, the size of the opening (person through hole 6) with respect to the beam hole H1 can be increased, and the height of the beam with respect to the opening (person through hole 6) can be reduced.
実施例１の鉄筋コンクリート梁の構造では、第１部品（第１補強筋１６）および第２部品（第２補強筋１７）は、両端部が１３５度以上に折り曲げられたフック部１６ｃ，１７ｃを有し、フック部１６ｃ，１７ｃは、主筋１１または軸方向補強筋１３に引っ掛けられる（図４）。 In the structure of the reinforced concrete beam of Example 1, the first part (first reinforcing bar 16) and the second part (second reinforcing bar 17) have hook parts 16c and 17c whose both ends are bent at 135 degrees or more. The hook portions 16c and 17c are hooked on the main reinforcement 11 or the axial reinforcement 13 (FIG. 4).
これにより、第１部品（第１補強筋１６）および第２部品（第２補強筋１７）が、主筋１１または軸方向補強筋１３にしっかりと固定される。そのため、鉄筋コンクリート梁（基礎梁５）のせん断耐力を向上させることができる。 Accordingly, the first part (first reinforcing bar 16) and the second part (second reinforcing bar 17) are firmly fixed to the main bar 11 or the axial direction reinforcing bar 13. Therefore, the shear strength of the reinforced concrete beam (foundation beam 5) can be improved.
実施例１の鉄筋コンクリート梁の構造では、開孔（人通孔６）の上方および下方で、それぞれ、上下方向において対向する主筋１１と軸方向補強筋１３に掛け渡されて配置される中子筋１８を備える（図４）。 In the structure of the reinforced concrete beam according to the first embodiment, the core bars that are arranged so as to be spanned by the main reinforcing bar 11 and the axial reinforcing bar 13 that are opposed to each other in the vertical direction above and below the opening (passage hole 6). 18 (FIG. 4).
これにより、鉄筋コンクリート梁（基礎梁５）のせん断補強筋の鉄筋量をさらに容易に調整することができる。そのため、柔軟な設計に対応することができる。 Thereby, the amount of reinforcement of the shear reinforcement of a reinforced concrete beam (foundation beam 5) can be adjusted still more easily. Therefore, it can respond to a flexible design.
まず、構成を説明する。
図９は、実施例２の基礎梁に配筋された鉄筋の構成を説明する構成図である。図１０は、実施例２の基礎梁の開孔領域の断面を示す断面図である。図１１は、実施例２のせん断補強板を示す構成図であり、図１１（ａ）が第１補強板を示し、図１１（ｂ）が第２補強板を示し、図１１（ｃ）が中子板を示す。以下、図９〜図１１に基づいて、実施例２の基礎梁の構成を説明する。なお、実施例１で説明した内容と同一乃至均等な部分の説明については、同一用語又は同一の符号を用いて説明する。
First, the configuration will be described.
FIG. 9 is a configuration diagram illustrating a configuration of a reinforcing bar arranged in the foundation beam according to the second embodiment. FIG. 10 is a cross-sectional view showing a cross section of the opening region of the foundation beam of the second embodiment. FIG. 11 is a configuration diagram showing a shear reinforcing plate of Example 2, in which FIG. 11 (a) shows a first reinforcing plate, FIG. 11 (b) shows a second reinforcing plate, and FIG. The core plate is shown. Hereinafter, the structure of the foundation beam of Example 2 is demonstrated based on FIGS. In addition, about the description of the part same or equivalent to the content demonstrated in Example 1, it demonstrates using the same term or the same code | symbol.
実施例２の基礎梁１０５は、第２せん断補強筋に替えて、板状のせん断補強板１１５を使用する点で、実施例１の基礎梁と相違する。 The foundation beam 105 of the second embodiment is different from the foundation beam of the first embodiment in that a plate-like shear reinforcement plate 115 is used instead of the second shear reinforcement.
基礎梁１０５には、図９および図１０に示すように、実施例１の第２せん断補強筋１５に替えて、せん断補強板１１５を備える。せん断補強板１１５は、曲げ加工された板金で形成される。 As shown in FIGS. 9 and 10, the foundation beam 105 includes a shear reinforcing plate 115 instead of the second shear reinforcing bar 15 of the first embodiment. The shear reinforcement plate 115 is formed of a bent sheet metal.
せん断補強板１１５は、人通孔６の上方と下方に配置される。なお、上方のせん断補強板１１５と、下方のせん断補強板１１５とは、対称形状であるため、上方のせん断補強板１１５について説明し、下方のせん断補強板１１５についての説明を省略する。 The shear reinforcement plate 115 is disposed above and below the person passage hole 6. Since the upper shear reinforcement plate 115 and the lower shear reinforcement plate 115 are symmetrical, only the upper shear reinforcement plate 115 will be described, and description of the lower shear reinforcement plate 115 will be omitted.
上方のせん断補強板１１５は、開孔領域Ｍ１に、あばら筋１２のピッチＰ１より広いピッチＰ４で、例えば、４つ配置される。上方のせん断補強板１１５は、図１０に示すように、第１部品としての第１補強板１１６と、第１補強板１１６と一対となる第２部品としての第２補強板１１７と、から構成される。 For example, four upper shear reinforcement plates 115 are arranged in the opening region M1 at a pitch P4 wider than the pitch P1 of the streaks 12. As shown in FIG. 10, the upper shear reinforcement plate 115 includes a first reinforcement plate 116 as a first component and a second reinforcement plate 117 as a second component paired with the first reinforcement plate 116. Is done.
第１補強板１１６は、図１１（ａ）に示すように、帯板状の本体部１１６ａと、本体部１１６ａの両端部から本体部１１６ａに対して同じ側に直角に折れ曲がって延在する延在部１１６ｂと、を備える。第２補強板１１７は、図１１（ｂ）に示すように、帯板状の本体部１１７ａと、本体部１１７ａの両端部から本体部１１７ａに対して同じ側に直角に折れ曲がって延在する延在部１１７ｂと、を備える。 As shown in FIG. 11 (a), the first reinforcing plate 116 is a strip-like main body 116a and an extension extending from the both ends of the main body 116a so as to be bent at a right angle to the same side with respect to the main body 116a. And the existing part 116b. As shown in FIG. 11 (b), the second reinforcing plate 117 is a band plate-shaped main body portion 117a and an extension extending at a right angle from both ends of the main body portion 117a to the same side with respect to the main body portion 117a. A presence portion 117b.
第１補強板１１６の延在部１１６ｂと、第２補強板１１７の延在部１１７ｂとが、重ね合わされて溶接されることで、第１補強板１１６と第２補強板１１７は、閉じられた形状に形成される。第１補強板１１６と第２補強板１１７は、図１０に示すように、最外周に配置された主筋１１と、基礎梁５の幅方向（図１０で左右方向）で外側の軸方向補強筋１３とを取り囲む。 The first reinforcing plate 116 and the second reinforcing plate 117 are closed by overlapping and welding the extending portion 116b of the first reinforcing plate 116 and the extending portion 117b of the second reinforcing plate 117. It is formed into a shape. As shown in FIG. 10, the first reinforcing plate 116 and the second reinforcing plate 117 are composed of the main reinforcing bars 11 arranged on the outermost periphery and the axial reinforcing bars on the outer side in the width direction of the foundation beam 5 (the horizontal direction in FIG. 10). 13 is surrounded.
さらに、実施例１の中子筋１８に替えて、せん断補強板１１５の間に中子板１１８を備えてもよい。中子板１１８は、曲げ加工された板金で形成される。中子板１１８は、図１１（ｃ）に示すように、帯板状の本体部１１８ａと、本体部１１８ａの両端部から本体部１１８ａに対して同じ側に１３５度に折れ曲がるフック部１１８ｃと、を備える。 Further, a core plate 118 may be provided between the shear reinforcement plates 115 instead of the core muscles 18 of the first embodiment. The core plate 118 is formed of a bent sheet metal. As shown in FIG. 11C, the core plate 118 includes a band plate-shaped main body portion 118a, hook portions 118c that bend at 135 degrees from both ends of the main body portion 118a to the same side with respect to the main body portion 118a, Is provided.
中子板１１８は、図１０に示すように、上方に配置された１つの主筋１１と、基礎梁１０５の上下方向において、この１つの主筋１１に対向する１つの軸方向補強筋１３と、に掛け渡されて配置される。中子板１１８は、基礎梁５の幅方向で、最外側の主筋１１より内側の主筋１１と、最外側の軸方向補強筋１３より内側の軸方向補強筋１３と、を支持するように配置される。なお、中子板１１８は、複数配置されてもよい。 As shown in FIG. 10, the core plate 118 includes one main reinforcing bar 11 disposed above and one axial reinforcing bar 13 facing the one main reinforcing bar 11 in the vertical direction of the foundation beam 105. Arranged over. The core plate 118 is disposed in the width direction of the foundation beam 5 so as to support the main reinforcement 11 inside the outermost main reinforcement 11 and the axial reinforcement 13 inside the outermost axial reinforcement 13. Is done. A plurality of core plates 118 may be arranged.
次に、作用を説明する。
実施例２の鉄筋コンクリート梁では、開孔（人通孔６）を挟んで上方および下方に配置される主筋１１とあばら筋１２を有する。この鉄筋コンクリート梁（基礎梁５）の構造において、開孔（人通孔６）の上方および下方で、それぞれ、主筋１１より開孔（人通孔６）側において鉄筋コンクリート梁（基礎梁５）の軸方向へ伸びる軸方向補強筋１３と、鉄筋コンクリート梁（基礎梁５）の軸方向において開孔（人通孔６）の両側で、それぞれ、開孔（人通孔６）を挟んで上方および下方に配置される主筋１１を取り囲んで配置される第１せん断補強筋１４と、開孔（人通孔６）の周囲に、鉄筋コンクリート梁（基礎梁５）の軸方向に対して傾斜する斜方向補強材を備える替わりに、開孔（人通孔６）の上方および下方で、それぞれ、主筋１１と軸方向補強筋１３を取り囲んで配置される、板金で形成されたせん断補強板１１５と、を備える。せん断補強板１１５は、第１部品（第１補強板１１６）と第２部品（第２補強板１１７）とで閉じられた形状に形成される（図９）。
Next, the operation will be described.
The reinforced concrete beam according to the second embodiment has the main bars 11 and the stirrups 12 arranged above and below the opening (person passage hole 6). In the structure of this reinforced concrete beam (foundation beam 5), the shaft of the reinforced concrete beam (foundation beam 5) is located above and below the opening (through hole 6) on the side of the opening (through hole 6) from the main bar 11, respectively. On the both sides of the opening (person passage hole 6) in the axial direction of the axial reinforcing bar 13 extending in the direction and the reinforced concrete beam (base beam 5), respectively, upward and downward with the opening (person passage hole 6) in between An oblique reinforcing member that is inclined with respect to the axial direction of the reinforced concrete beam (base beam 5) around the first shear reinforcing bar 14 that is disposed to surround the main bar 11 that is disposed and the opening (the through hole 6). The shear reinforcement plate 115 made of sheet metal is disposed above and below the opening (person passage hole 6) and surrounding the main reinforcement 11 and the axial reinforcement 13 respectively. The shear reinforcing plate 115 is formed in a shape closed by the first component (first reinforcing plate 116) and the second component (second reinforcing plate 117) (FIG. 9).
これにより、主筋１１と軸方向補強筋１３に取り付ける部品の数を減らすことができる。そのため、施工性を向上させることができる。なお、実施例２のこの他の構成及び作用効果については、実施例１と略同様であるため、説明を省略する。 Thereby, the number of components attached to the main reinforcement 11 and the axial direction reinforcement reinforcement 13 can be reduced. Therefore, workability can be improved. Other configurations and operational effects of the second embodiment are substantially the same as those of the first embodiment, and thus description thereof is omitted.
以上、本開示の鉄筋コンクリート梁の構造を実施例１および実施例２に基づき説明してきた。しかし、具体的な構成については、これらの実施例に限られるものではなく、特許請求の範囲の各請求項に係る発明の要旨を逸脱しない限り、各実施例の組み合わせ、設計の変更や追加等は許容される。 As mentioned above, the structure of the reinforced concrete beam of this indication has been explained based on Example 1 and Example 2. However, the specific configuration is not limited to these examples, and combinations of the examples, design changes and additions, etc., unless departing from the spirit of the invention according to each claim of the claims. Is acceptable.
実施例１では、第１補強筋１６と、第２補強筋１７と、中子筋１８と、の両端部が１３５度に折れ曲がる例を示した。しかし、第１補強筋と、第２補強筋と、中子筋とは、両端部が１３５度以上に折れ曲がってもよい。 In Example 1, the example which the both ends of the 1st reinforcement bar | burr 16, the 2nd reinforcement bar | burr 17, and the core reinforcement 18 bend at 135 degree | times was shown. However, the first reinforcing bar, the second reinforcing bar, and the core bar may be bent at both ends of 135 degrees or more.
具体的には、図１２（ａ）に示すように、第１補強筋２１６は、本体部１６ａと、本体部１６ａの両端部から本体部１６ａに対して同じ側に直角に折れ曲がって延在する延在部１６ｂと、延在部１６ｂの端部から互いに対向するように１８０度に折れ曲がるフック部２１６ｃと、を備える。第２補強筋２１７は、図１２（ｂ）に示すように、本体部１７ａと、本体部１７ａの両端部から本体部１７ａに対して同じ側に１８０度に折れ曲がるフック部２１７ｃと、を備える。中子筋２１８は、図１２（ｃ）に示すように、本体部１８ａと、本体部１８ａの両端部から本体部１８ａに対して同じ側に１８０度に折れ曲がるフック部２１８ｃと、を備える。 Specifically, as shown in FIG. 12 (a), the first reinforcing bars 216 extend from the main body portion 16a and both ends of the main body portion 16a by being bent at a right angle to the same side with respect to the main body portion 16a. The extending part 16b and the hook part 216c bent at 180 degrees so as to face each other from the end part of the extending part 16b are provided. As shown in FIG. 12B, the second reinforcing bar 217 includes a main body portion 17a and a hook portion 217c that bends 180 degrees from both ends of the main body portion 17a to the same side with respect to the main body portion 17a. As shown in FIG. 12C, the core muscle 218 includes a main body portion 18a and a hook portion 218c that bends at 180 degrees from both ends of the main body portion 18a to the same side with respect to the main body portion 18a.
また、第１補強筋と、第２補強筋とは、両端部が９０度に折れ曲がってもよい。この場合、図１３（ａ）に示すように、第１補強筋３１６は、本体部１６ａと、本体部１６ａの両端部から本体部１６ａに対して同じ側に直角に折れ曲がって延在する延在部３１６ｂと、を備える。 Further, both ends of the first reinforcing bar and the second reinforcing bar may be bent at 90 degrees. In this case, as shown to Fig.13 (a), the 1st reinforcement bar | burr 316 is extended from the both ends of the main-body part 16a at right angles with respect to the main-body part 16a at right angles. Part 316b.
第２補強筋３１７は、図１３（ｂ）に示すように、本体部１７ａと、本体部１７ａの両端部から本体部１７ａに対して同じ側に直角に折れ曲がって延在する延在部３１７ｂと、を備える。第１補強筋３１６の延在部３１６ｂと、第２補強筋３１７の延在部３１７ｂとは、図１３（ｃ）に示すように、重ね合わされて溶接され、閉じられた形状に形成される。 As shown in FIG. 13 (b), the second reinforcing bar 317 includes a main body portion 17a and an extending portion 317b that extends from both end portions of the main body portion 17a so as to be bent at a right angle to the same side with respect to the main body portion 17a. . As shown in FIG. 13C, the extending portion 316b of the first reinforcing bar 316 and the extending portion 317b of the second reinforcing bar 317 are overlapped and welded to form a closed shape.
実施例１では、第１補強筋１６のフック部１６ｃと、第２補強筋１７のフック部１７ｃとは、軸方向補強筋１３に引っ掛けられる例を示した。しかし、第１補強筋のフック部と、第２補強筋のフック部とは、主筋に引っ掛けられてもよい。 In Example 1, the hook part 16c of the 1st reinforcement bar | burr 16 and the hook part 17c of the 2nd reinforcement bar | burr 17 showed the example hooked by the axial direction reinforcement bar | burr 13. As shown in FIG. However, the hook portion of the first reinforcing bar and the hook portion of the second reinforcing bar may be hooked on the main bar.
実施例２では、第２せん断補強筋および第３せん断補強筋を板金とする例を示した。しかし、第１せん断補強筋を板金とすることもできる。 In Example 2, the example which used the 2nd shear reinforcement bar and the 3rd shear reinforcement bar as sheet metal was shown. However, the first shear reinforcement may be a sheet metal.
実施例１および実施例２では、人通孔６を断面正方形とする例を示した。しかし、人通孔としては、断面長方形であっても、断面多角形であっても、断面円形であってもよい。実施例１および実施例２では、鉄筋同士を結束線により拘束する例を示した。しかし、鉄筋同士は、溶接などで連結されてもよい。 In Example 1 and Example 2, the example which made the through-hole 6 cross-sectional square was shown. However, the through hole may have a rectangular cross section, a polygonal cross section, or a circular cross section. In Example 1 and Example 2, the example which restrains reinforcing bars with a binding wire was shown. However, the reinforcing bars may be connected by welding or the like.
実施例１および実施例２では、主筋１１と、あばら筋１２と、軸方向補強筋１３と、第１せん断補強筋１４と、第２せん断補強筋１５とは、Ｄ１３の異形鋼棒を使用する例を示した。しかし、鉄筋の径は、これに限定されるものではなく、何れかの鉄筋の径を、他の鉄筋の径より大きく形成してもよい。 In the first and second embodiments, the main bar 11, the stirrup 12, the axial reinforcing bar 13, the first shear reinforcing bar 14, and the second shear reinforcing bar 15 use D13 deformed steel bars. An example is shown. However, the diameter of the reinforcing bar is not limited to this, and the diameter of any reinforcing bar may be formed larger than the diameter of the other reinforcing bars.
実施例１および実施例２では、第１せん断補強筋１４をあばら筋１２のピッチＰ１より狭いピッチＰ２とし、第２せん断補強筋１５をあばら筋１２のピッチＰ１より狭いピッチＰ３とし、せん断補強板１１５をあばら筋１２のピッチＰ１より広いピッチＰ４とする例を示した。しかし、第１せん断補強筋１４と、第２せん断補強筋１５と、せん断補強板１１５と、の配置ピッチは、人通孔の大きさや、基礎梁における人通孔を設ける位置によって、自由に設定することができる。 In the first and second embodiments, the first shear reinforcing bar 14 is set to a pitch P2 narrower than the pitch P1 of the stirrups 12, the second shear reinforcing bar 15 is set to a pitch P3 narrower than the pitch P1 of the staggered bars 12, and the shear reinforcing plate is used. An example in which 115 is set to a pitch P4 wider than the pitch P1 of the streaks 12 is shown. However, the arrangement pitch of the first shear reinforcement bar 14, the second shear reinforcement bar 15, and the shear reinforcement plate 115 can be freely set depending on the size of the through hole and the position where the through hole is provided in the foundation beam. can do.
実施例２のせん断補強板１１５および中子板１１８は、例えば格子状に形成されたビードのように、表面に凹凸を形成してもよい。 The shear reinforcing plate 115 and the core plate 118 according to the second embodiment may have irregularities on the surface, such as beads formed in a lattice shape.
実施例１および実施例２では、軸方向補強筋１３は、基礎梁５の幅方向における主筋１１の数と同じ数を配置する例を示した。しかし、軸方向補強筋としては、基礎梁の幅方向における主筋の数より、少ない数を配置してもよい。 In Example 1 and Example 2, the example which arrange | positions the same number as the number of the main reinforcement 11 in the width direction of the foundation beam 5 has shown the axial direction reinforcing bar 13 is shown. However, the number of reinforcing bars in the axial direction may be less than the number of main bars in the width direction of the foundation beam.
実施例１および実施例２では、開孔を人通孔６とする例を示した。しかし、開孔としては、人通孔に限定されるものではなく、様々な貫通孔とすることができる。実施例１および実施例２では、本発明を、基礎梁５に適用される例を示した。しかし、本発明は、基礎梁に限定されず、つなぎ梁や大梁に適用することができる。 In Example 1 and Example 2, the example which made the opening the human through hole 6 was shown. However, the opening is not limited to a human through hole, and can be various through holes. In Example 1 and Example 2, the example in which the present invention is applied to the foundation beam 5 was shown. However, the present invention is not limited to the foundation beam, and can be applied to a connecting beam or a large beam.
１ 基礎
５ 基礎梁（鉄筋コンクリート梁の一例）
６ 人通孔（開孔の一例）
１１ 主筋
１２ あばら筋
１３ 軸方向補強筋
１４ 第１せん断補強筋
１５ 第２せん断補強筋
１６ 第１補強筋（第１部品の一例）
１６ｃ フック部
１７ 第２補強筋（第２部品の一例）
１７ｃ フック部
１８ 中子筋
１１５ せん断補強板
１１６ 第１補強板（第１部品の一例）
１１７ 第２補強板（第２部品の一例）
Ｈ１ 開孔の高さ
Ｈ２ 梁せい
1 Foundation 5 Foundation beam (an example of a reinforced concrete beam)
6 person through hole (example of opening)
DESCRIPTION OF SYMBOLS 11 Main reinforcement 12 Stirrup 13 Axial reinforcement 14 First shear reinforcement 15 Second shear reinforcement 16 First reinforcement (an example of first part)
16c hook part 17 2nd reinforcement (an example of 2nd component)
17c Hook part 18 Core reinforcement 115 Shear reinforcement board 116 1st reinforcement board (an example of 1st components)
117 Second reinforcing plate (an example of second component)
H1 Height of hole H2 Beam
Claims (5)
前記開孔の上方および下方で、それぞれ、前記主筋より開孔側において前記鉄筋コンクリート梁の軸方向へ伸びる軸方向補強筋と、
前記鉄筋コンクリート梁の軸方向において前記開孔の両側で、それぞれ、前記開孔を挟んで上方および下方に配置される前記主筋を取り囲んで配置される第１せん断補強筋と、
前記開孔の周囲に、前記鉄筋コンクリート梁の軸方向に対して傾斜する斜方向補強材を備える替わりに、前記開孔の上方および下方で、それぞれ、前記主筋と前記軸方向補強筋を取り囲んで配置される第２せん断補強筋と、を備え、
前記第２せん断補強筋は、第１部品と第２部品とで閉じられた形状に形成され、
前記開孔の高さは、前記鉄筋コンクリート梁の梁せいの１／３より大きく、１／２以下である
ことを特徴とする鉄筋コンクリート梁の構造。 A structure of a reinforced concrete beam having a main bar and a stirrup arranged above and below across an opening,
An axial reinforcing bar extending in the axial direction of the reinforced concrete beam on the opening side of the main bar above and below the opening, respectively.
A first shear reinforcement bar arranged on both sides of the opening in the axial direction of the reinforced concrete beam, surrounding the main bars arranged above and below the opening, respectively,
Instead of providing oblique reinforcements that are inclined with respect to the axial direction of the reinforced concrete beam around the openings, they are disposed above and below the openings so as to surround the main reinforcement and the axial reinforcement, respectively. A second shear reinforcement,
The second shear reinforcement is formed in a shape closed by the first part and the second part,
The height of the opening is greater than 1/3 and less than or equal to 1/3 of the beam of the reinforced concrete beam.
ことを特徴とする、請求項１に記載の鉄筋コンクリート梁の構造。 The reinforced concrete beam structure according to claim 1, wherein the height of the opening is ½ of the beam length of the reinforced concrete beam.
前記フック部は、前記主筋または前記軸方向補強筋に引っ掛けられる
ことを特徴とする、請求項１又は２に記載の鉄筋コンクリート梁の構造。 The first part and the second part have hook portions whose both ends are bent to 135 degrees or more,
The reinforced concrete beam structure according to claim 1 or 2, wherein the hook portion is hooked on the main reinforcing bar or the axial reinforcing bar.
ことを特徴とする、請求項１〜３の何れか一項に記載の鉄筋コンクリート梁の構造。 4. The core according to claim 1, further comprising: a core bar arranged above and below the opening in a manner extending across the main bar and the axial reinforcing bar facing each other in the vertical direction. The structure of a reinforced concrete beam according to claim 1.
前記開孔の上方および下方で、それぞれ、前記主筋より開孔側において前記鉄筋コンクリート梁の軸方向へ伸びる軸方向補強筋と、
前記鉄筋コンクリート梁の軸方向において前記開孔の両側で、それぞれ、前記開孔を挟んで上方および下方に配置される前記主筋を取り囲んで配置される第１せん断補強筋と、
前記開孔の周囲に、前記鉄筋コンクリート梁の軸方向に対して傾斜する斜方向補強材を備える替わりに、前記開孔の上方および下方で、それぞれ、前記主筋と前記軸方向補強筋を取り囲んで配置される、板金で形成されたせん断補強板と、を備え、
前記せん断補強板は、第１部品と第２部品とで閉じられた形状に形成される
ことを特徴とする鉄筋コンクリート梁の構造。 A structure of a reinforced concrete beam having a main bar and a stirrup arranged above and below across an opening,
An axial reinforcing bar extending in the axial direction of the reinforced concrete beam on the opening side of the main bar above and below the opening, respectively.
A first shear reinforcement bar arranged on both sides of the opening in the axial direction of the reinforced concrete beam, surrounding the main bars arranged above and below the opening, respectively,
Instead of providing oblique reinforcements that are inclined with respect to the axial direction of the reinforced concrete beam around the openings, they are disposed above and below the openings so as to surround the main reinforcement and the axial reinforcement, respectively. A shear reinforcement plate formed of sheet metal,
The structure of a reinforced concrete beam, wherein the shear reinforcing plate is formed in a shape closed by a first part and a second part.
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