JP7092488B2 - Reinforcing bar members and reinforced concrete structures using reinforcing bar members - Google Patents

Reinforcing bar members and reinforced concrete structures using reinforcing bar members Download PDF

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JP7092488B2
JP7092488B2 JP2017216850A JP2017216850A JP7092488B2 JP 7092488 B2 JP7092488 B2 JP 7092488B2 JP 2017216850 A JP2017216850 A JP 2017216850A JP 2017216850 A JP2017216850 A JP 2017216850A JP 7092488 B2 JP7092488 B2 JP 7092488B2
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reinforcing bar
bar member
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bars
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泰邦 吉岡
啓介 塩田
恭太郎 神田
仁志 内藤
宏之 今塩
和樹 有薗
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JFE Civil Engineering and Construction Corp
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Description

本発明は、鉄筋コンクリート構造に使用する鉄筋部材に関し、特に鉄筋部材の構造及びその鉄筋部材を使用した鉄筋コンクリート構造物に関するものである。 The present invention relates to a reinforcing bar member used for a reinforced concrete structure, and more particularly to a structure of the reinforcing bar member and a reinforced concrete structure using the reinforcing bar member.

従来、鉄筋コンクリート構造による構造物を構築、補修、補強するときには、工場において加工された格子形状を有する平板状の鉄筋部材を現場に搬入して現場で構造物の所定の位置に設置する技術が考案されている。 Conventionally, when constructing, repairing, and reinforcing a structure with a reinforced concrete structure, a technique was devised to bring a flat plate-shaped reinforcing bar member having a lattice shape processed at the factory to the site and install it at a predetermined position on the site. Has been done.

このような従来の鉄筋部材の施工は、格子状の鉄筋部材を構造物の梁、床、又は柱等の構造物の表面に沿って所定の距離を持って配置し、その上からモルタル等の充填材を吹き付ける。充填材は、鉄筋部材と構造物との間の空間に充填され、さらに鉄筋部材からの充填材の厚さが所定の寸法になる様に鉄筋部材を覆う。このような構造により、棒鋼などの鉄筋を現場で技能者により組み立てる工程や、工場で鉄筋の溶接作業を行う工程が不要となり、鉄筋組み立て時の手間やコストを抑えるとともに技能者の確保が不要となる。また、格子状の鉄筋部材により鉄筋コンクリート構造の耐荷重性能を向上させている。 In the construction of such conventional reinforcing bar members, lattice-shaped reinforcing bar members are arranged along the surface of the structure such as beams, floors, or columns of the structure at a predetermined distance, and mortar or the like is placed on the reinforcing bar members. Spray the filler. The filler fills the space between the reinforcing bar member and the structure, and further covers the reinforcing bar member so that the thickness of the filler from the reinforcing bar member becomes a predetermined dimension. With such a structure, the process of assembling reinforcing bars such as steel bars by technicians on site and the process of welding reinforcing bars at the factory are not required, which reduces the labor and cost of assembling the reinforcing bars and eliminates the need to secure technicians. Become. In addition, the load-bearing performance of the reinforced concrete structure is improved by the lattice-shaped reinforcing bar members.

特許文献１に開示されている鉄筋部材は、例えば鉄筋コンクリート構造物のスラブに適用され、主筋がスラブの一方の端部から他方の端部に向かって延びている。スラブの一方の端部と他方の端部とは同じ幅に形成されている。スラブに適用された鉄筋部材の主筋は、所定の間隔をおいて平行に配置され、スラブの一方の端部から他方の端部までを繋ぐように配置される。スラブの一方の端部と他方の端部とは、例えば鉄筋コンクリート構造物の柱や壁等の下部構造により支持される部位である。スラブの上面に荷重がかかった場合、スラブは下部構造に両端を支持され、スラブの中央部は荷重により撓む。鉄筋部材は、このスラブの撓みによる引っ張り応力に対し抵抗するように配置される。鉄筋部材の主筋は、スラブの両端を繋ぐように配置されることにより、スラブが下部構造により支持される部位の間を繋ぐため、スラブの上面に荷重がかかったときの引っ張り応力に対抗することができ、スラブの強度及び剛性を確保することができる。 The reinforcing bar member disclosed in Patent Document 1 is applied to, for example, a slab of a reinforced concrete structure, and a main bar extends from one end of the slab toward the other end. One end of the slab and the other end are formed to have the same width. The main bars of the reinforcing bar members applied to the slab are arranged in parallel at predetermined intervals, and are arranged so as to connect one end to the other end of the slab. One end and the other end of the slab are portions supported by a substructure such as a column or wall of a reinforced concrete structure. When a load is applied to the upper surface of the slab, the slab is supported at both ends by the lower structure, and the central portion of the slab bends due to the load. The reinforcing bar member is arranged so as to resist the tensile stress due to the bending of the slab. The main bar of the reinforcing bar member is arranged so as to connect both ends of the slab to connect between the parts supported by the lower structure, so that the tensile stress when a load is applied to the upper surface of the slab is countered. The strength and rigidity of the slab can be ensured.

特開２０１６－７９５８５号公報Japanese Unexamined Patent Publication No. 2016-79585

しかし、特許文献１に開示されている鉄筋部材を例えば両端が異なる幅のスラブに適用した場合、主筋が所定の間隔で平行に配置されているため、主筋がスラブの両端を繋ぐことができない。特に特許文献１に開示されている鉄筋部材は、主筋間の幅が均等な格子状に形成されているため、スラブの一方の端部と他方の端部とを主筋で繋ぐように配置するためには、複数の鉄筋部材を主筋が延びる方向を変えて配置する必要がある。このようにスラブに鉄筋部材を配置した場合、鉄筋部材が重なる部分ができるため、コンクリートのかぶり厚さを確保するため鉄筋部材が重なる部分のスラブ表面を凸させるか、又はスラブ全体にわたってコンクリートを厚く打たなければならず構造物の重量が増加するという課題があった。また、スラブの断面において鉄筋の密度が均一でなくなるため、コンクリートを設置する場合にコンクリートが流動しにくく、施工が困難であるという課題があった。 However, when the reinforcing bar member disclosed in Patent Document 1 is applied to slabs having different widths at both ends, for example, the main bars are arranged in parallel at predetermined intervals, so that the main bars cannot connect both ends of the slab. In particular, since the reinforcing bar member disclosed in Patent Document 1 is formed in a grid pattern having uniform widths between the main bars, it is arranged so that one end and the other end of the slab are connected by the main bars. It is necessary to arrange a plurality of reinforcing bar members in different directions in which the main reinforcing bars extend. When the reinforcing bar members are arranged on the slab in this way, there is a portion where the reinforcing bar members overlap. There was a problem that the weight of the structure had to be struck and increased. Further, since the density of the reinforcing bars is not uniform in the cross section of the slab, there is a problem that the concrete does not easily flow when the concrete is installed, which makes the construction difficult.

本発明は上記の問題を解決するためになされたものであり、両端の幅が異なる領域に鉄筋部材を埋め込む場合に、鉄筋部材を埋め込む領域の両端を繋ぐ様に主筋を配置でき、各断面における鉄筋密度のばらつきを小さくできる鉄筋部材、及びその鉄筋部材を使用した鉄筋コンクリート構造物を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and when a reinforcing bar member is embedded in a region having different widths at both ends, a main reinforcing bar can be arranged so as to connect both ends of the region in which the reinforcing bar member is embedded. It is an object of the present invention to provide a reinforcing bar member capable of reducing variation in the reinforcing bar density, and a reinforced concrete structure using the reinforcing bar member.

本発明に係る鉄筋部材は、隣合って配置された２つの主筋を含む複数の主筋と、隣合う前記２つの主筋の側面の間を連結する複数の配力筋と、を有し、格子状に形成された鉄筋部材であって、前記２つの主筋の延びる方向において一方の端部における前記２つの主筋の間隔は、前記２つの主筋の延びる方向において他方の端部における前記２つの主筋の間隔よりも広い。 The reinforcing bar member according to the present invention has a plurality of main bars including two adjacent main bars and a plurality of force distribution bars connecting between the side surfaces of the two adjacent main bars, and has a grid pattern. The distance between the two main bars at one end in the extending direction of the two main bars is the distance between the two main bars at the other end in the extending direction of the two main bars. Wider than.

本発明に係る鉄筋コンクリート構造物は、上記の鉄筋部材が埋め込まれた床版を備え、前記床版は、下部構造によって支持される被支持部に前記鉄筋部材の前記２つの主筋の端部が位置する様に前記鉄筋部材が配筋されている。 The reinforced concrete structure according to the present invention includes a floor slab in which the above-mentioned reinforcing bar member is embedded, and the floor slab has the ends of the two main bars of the reinforcing bar member located at a supported portion supported by the lower structure. The reinforcing bar members are arranged so as to do so.

本発明に係る鉄筋部材、及び、その鉄筋部材を使用した鉄筋コンクリート構造物によれば、鉄筋部材を埋め込む領域の両端の幅が異なるような場合であっても、主筋が両端を繋ぐように配置できる。そのため、鉄筋コンクリート構造物は、耐荷重性能を確保しながら、鉄筋部材を効率的に配置できる。これにより、鉄筋コンクリート構造物の表面が一部突出したり、鉄筋部材を覆う充填材を所定の厚みよりも大きくする必要がなくなる。よって、施工後の鉄筋コンクリート構造物の表面を平坦にすることができ、かつ、施工後の鉄筋コンクリート構造物の全体の寸法及び重量を小さくすることができる。 According to the reinforcing bar member according to the present invention and the reinforced concrete structure using the reinforcing bar member, even if the widths of both ends of the region where the reinforcing bar member is embedded are different, the main reinforcing bar can be arranged so as to connect both ends. .. Therefore, in the reinforced concrete structure, the reinforcing bar members can be efficiently arranged while ensuring the load-bearing performance. This eliminates the need for the surface of the reinforced concrete structure to partially protrude and the filler covering the reinforcing bar member to be larger than a predetermined thickness. Therefore, the surface of the reinforced concrete structure after construction can be flattened, and the overall dimensions and weight of the reinforced concrete structure after construction can be reduced.

本発明の実施の形態１に係る鉄筋部材を適用した橋梁の模式図である。It is a schematic diagram of the bridge to which the reinforcing bar member which concerns on Embodiment 1 of this invention is applied. 図１の床版の平面図である。It is a top view of the floor slab of FIG. 図２のＡ部の拡大図である。It is an enlarged view of the part A of FIG. 図２のＢ部の拡大図である。It is an enlarged view of the B part of FIG. 図２のＣ部の拡大図である。It is an enlarged view of the part C of FIG. 比較例の鉄筋部材を適用した床版の模式図である。It is a schematic diagram of the floor slab to which the reinforcing bar member of the comparative example is applied. 本発明の実施の形態２に係る橋梁の床版の平面図である。It is a top view of the deck of the bridge which concerns on Embodiment 2 of this invention. 本発明の実施の形態２に係る床版の鉄筋部材が重なっている部分の断面図である。It is sectional drawing of the part where the reinforcing bar member of the floor slab which concerns on Embodiment 2 of this invention overlaps. 本発明の実施の形態２に係る床版の変形例を示す図である。It is a figure which shows the modification of the floor slab which concerns on Embodiment 2 of this invention.

以下、図面に基づいて本発明の実施の形態について説明する。各図において、同一の符号を付した部位については、同一の又はこれに相当する部位を表すものであって、これは明細書の全文において共通している。また、明細書全文に表れている構成要素の形態は、あくまで例示であって、本発明は明細書内の記載のみに限定されるものではない。特に構成要素の組み合わせは、各実施の形態における組み合わせのみに限定するものではなく、他の実施の形態に記載した構成要素を別の実施の形態に適用することができる。さらに、添字で区別等している複数の同種の部位について、特に区別したり、特定したりする必要がない場合には、添字を省略して記載する場合がある。また、図面では各構成部材の大きさの関係が実際のものとは異なる場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the parts with the same reference numerals represent the same or corresponding parts, which are common to the entire text of the specification. Further, the form of the component appearing in the entire specification is merely an example, and the present invention is not limited to the description in the specification. In particular, the combination of components is not limited to the combination in each embodiment, and the components described in other embodiments can be applied to another embodiment. Further, when it is not necessary to particularly distinguish or specify a plurality of parts of the same type that are distinguished by a subscript, the subscript may be omitted. Further, in the drawings, the relationship between the sizes of the constituent members may differ from the actual one.

本発明に係る鉄筋部材は、鉄筋コンクリート構造物のスラブ、床版等に使用されるものである。また、鉄筋部材は、トンネルの覆工コンクリート、水門、水路などの土木構造物にも使用される。さらに、鉄筋部材は、新設の鉄筋コンクリート構造物に埋め込まれるだけでなく、既設の鉄筋コンクリート構造に対する後打ちコンクリートに埋め込まれて使用されるものである。 The reinforcing bar member according to the present invention is used for slabs, floor slabs, etc. of reinforced concrete structures. Reinforcing bar members are also used in civil engineering structures such as tunnel lining concrete, floodgates, and waterways. Further, the reinforcing bar member is used not only embedded in a newly constructed reinforced concrete structure but also embedded in a post-casting concrete for an existing reinforced concrete structure.

実施の形態１．
図１は、本発明の実施の形態１に係る鉄筋部材１０を適用した橋梁１００の模式図である。本発明の鉄筋コンクリート構造物は、例えば橋梁であり、実施の形態１においては橋梁を例として説明するが、鉄筋コンクリート構造物は、橋梁のみに限定されるものではない。橋梁１００は、橋脚９０上に支承９１を備え、橋脚９０及び支承９１を下部構造としている。橋梁１００は、２つの橋脚９０に備えられた支承９１の上に上部構造として床版９２を渡して構成されている。図１は、一方の支承９１Ａの中央と他方の支承９１Ｂの中央とを結ぶ線を含む鉛直断面を示している。 Embodiment 1.
FIG. 1 is a schematic view of a bridge 100 to which the reinforcing bar member 10 according to the first embodiment of the present invention is applied. The reinforced concrete structure of the present invention is, for example, a bridge, and although the bridge will be described as an example in the first embodiment, the reinforced concrete structure is not limited to the bridge. The bridge 100 is provided with a bearing 91 on the pier 90, and the pier 90 and the bearing 91 are substructures. The bridge 100 is configured by passing a floor slab 92 as an upper structure on a bearing 91 provided on two piers 90. FIG. 1 shows a vertical cross section including a line connecting the center of one bearing 91A and the center of the other bearing 91B.

床版９２は、橋梁１００の上を通る自動車等の荷重を直接受ける部材である。床版９２は、橋梁１００上の物体から荷重を受けると支承９１Ａ、９１Ｂを支点として両端支持梁として撓む。床版９２は、撓んで上面側の断面においては圧縮応力が発生し、下面側の断面においては引っ張り応力が発生する。鉄筋部材１０は、支承９１Ａと支承９１Ｂとの間で発生する引っ張り応力に対抗するものである。以下、支承９１Ａと支承９２Ｂとの間を支間と呼ぶ。また、一方の支承９１から他方の支承９１に向かう方向を支間方向と呼ぶ。 The deck 92 is a member that directly receives the load of an automobile or the like passing over the bridge 100. When a load is received from an object on the bridge 100, the deck 92 bends as a support beam at both ends with the bearings 91A and 91B as fulcrums. The deck 92 bends and a compressive stress is generated in the cross section on the upper surface side, and a tensile stress is generated in the cross section on the lower surface side. The reinforcing bar member 10 counteracts the tensile stress generated between the bearing 91A and the bearing 91B. Hereinafter, the section between the bearing 91A and the bearing 92B is referred to as a span. Further, the direction from one bearing 91 to the other bearing 91 is called a span direction.

図２は、図１の床版９２の平面図である。図１の橋梁１００の床版９２は、一方の支承９１Ａに支持される部分である被支持部９３Ａと他方の支承９１Ｂに支持される部分である被支持部９３Ｂとを有する。被支持部９３Ａと被支持部９３Ｂとは、床版９２の平面部に対し垂直上方から見た時に幅が異なっている。つまり、被支持部９３Ａの幅寸法Ｗ１に対し被支持部９３Ｂの幅寸法Ｗ２が小さくなっている。鉄筋部材１０は、床版９２の形状に従って平面部の全域にわたって配置されている。 FIG. 2 is a plan view of the floor slab 92 of FIG. The floor slab 92 of the bridge 100 of FIG. 1 has a supported portion 93A which is a portion supported by one bearing 91A and a supported portion 93B which is a portion supported by the other bearing 91B. The supported portion 93A and the supported portion 93B have different widths when viewed from above perpendicular to the flat surface portion of the deck 92. That is, the width dimension W2 of the supported portion 93B is smaller than the width dimension W1 of the supported portion 93A. The reinforcing bar member 10 is arranged over the entire flat surface portion according to the shape of the floor slab 92.

鉄筋部材１０は、一方の端部２１Ａから他方の端部２１Ｂに向かって延びる主筋２０を複数備える。主筋２０は、一方の端部２１Ａから他方の端部２１Ｂに向かって直線状に延びている。また、鉄筋部材１０は、隣合った主筋２０の間を接続するように配力筋２２を備える。配力筋２２は、主筋２０に交わる方向に直線状に延びている。主筋２０と配力筋２２とは、表面が同一面を形成しており、鉄筋部材１０は、主筋２０と配力筋２２とにより格子形状が形成された一枚の鋼板である。鉄筋部材１０は、主筋２０とそれと交わる方向に延びる配力筋２２とが表面が同一面となるように形成されている。そのため、従来の断面が円形の鉄筋を縦横に組み合わせた鉄筋コンクリート構造物と比較して、厚み方向の寸法を小さくしたまま同等の強度が得られるという利点がある。 The reinforcing bar member 10 includes a plurality of main reinforcing bars 20 extending from one end portion 21A toward the other end portion 21B. The main bar 20 extends linearly from one end 21A toward the other end 21B. Further, the reinforcing bar member 10 is provided with a force distribution bar 22 so as to connect between the adjacent main bars 20. The force distribution bar 22 extends linearly in the direction intersecting the main bar 20. The surfaces of the main bar 20 and the force distribution bar 22 form the same surface, and the reinforcing bar member 10 is a single steel plate having a lattice shape formed by the main bar 20 and the force distribution bar 22. The reinforcing bar member 10 is formed so that the surface of the main bar 20 and the force distribution bar 22 extending in the direction intersecting the main bar 20 are flush with each other. Therefore, there is an advantage that the same strength can be obtained while reducing the dimension in the thickness direction as compared with the conventional reinforced concrete structure in which reinforcing bars having a circular cross section are combined vertically and horizontally.

図２に示される様に、主筋２０は、床版９２の一方の被支持部９３Ａと他方の被支持部９３Ｂとを繋ぐ様に配置されている。床版９２の一方の被支持部９３Ａの幅寸法Ｗ１は、床版９２の他方の被支持部９３Ｂの幅寸法Ｗ２よりも大きい。そのため、主筋２０の一方の端部２１Ａにおける主筋２０同士の間隔は、他方の端部２１Ｂにおける主筋２０同士の間隔よりも広い。言い換えると、床版９２は、被支持部９３Ｂから被支持部９３Ａに向かって幅が徐々に広がる様に形成されており、床版９２に配筋された鉄筋部材１０の主筋２０の間隔も床版９２の幅の変化に従って広がっている。また、支間方向に直交する各断面において、主筋２０同士の間隔は均等であるのが望ましい。なお、主筋２０同士の間隔とは、主筋２０の中心線同士の間隔、すなわち主筋２０のピッチ寸法を指す。 As shown in FIG. 2, the main bar 20 is arranged so as to connect one supported portion 93A of the deck 92 and the other supported portion 93B. The width dimension W1 of one supported portion 93A of the deck 92 is larger than the width dimension W2 of the other supported portion 93B of the deck 92. Therefore, the distance between the main bars 20 at one end 21A of the main bar 20 is wider than the distance between the main bars 20 at the other end 21B. In other words, the floor slab 92 is formed so that the width gradually increases from the supported portion 93B toward the supported portion 93A, and the distance between the main bars 20 of the reinforcing bar members 10 arranged on the floor slab 92 is also the floor. It spreads as the width of the plate 92 changes. Further, it is desirable that the distance between the main bars 20 is even in each cross section orthogonal to the span direction. The distance between the main bars 20 refers to the distance between the center lines of the main bars 20, that is, the pitch dimension of the main bars 20.

図２において、床版９２の両端部に示されている一点鎖線は、支承線Ｐ、Ｑである。支承線Ｐ、Ｑは、床版９２を支持する支承９１の床版９２の平面視における位置を示すものである。配力筋２２は、被支持部９３Ａ、９３Ｂの支承線Ｐ、Ｑに略平行に均等な間隔をおいて複数設けられている。配力筋２２は、隣合う主筋２０の間を連結し、床版９２に発生する引っ張り応力のうち支間方向に交わる方向の引っ張り応力に対抗する。なお、実施の形態１において、床版９２の両端の支承線Ｐ、Ｑは平行になっているが、この形態に限定されるものではない。床版９２の支承線Ｐ、Ｑが平行でなくとも、主筋２０が支承線Ｐと支承線Ｑとを繋ぐ様に配置されていればよい。つまり、床版９２に埋め込まれた鉄筋部材１０の主筋２０の両端部が床版９２の被支持部９３Ａ、９３Ｂに位置する様に配筋されていればよい。 In FIG. 2, the alternate long and short dash lines shown at both ends of the deck 92 are bearing lines P and Q. The support lines P and Q indicate the positions of the floor slab 92 of the support 91 that supports the floor slab 92 in a plan view. A plurality of force distribution bars 22 are provided at equal intervals substantially parallel to the support lines P and Q of the supported portions 93A and 93B. The force distribution bar 22 connects between the adjacent main bars 20 and opposes the tensile stress in the direction intersecting the span direction among the tensile stress generated in the deck 92. In the first embodiment, the support lines P and Q at both ends of the deck 92 are parallel, but the present invention is not limited to this form. Even if the support lines P and Q of the deck 92 are not parallel, the main bar 20 may be arranged so as to connect the support line P and the support line Q. That is, both ends of the main bar 20 of the reinforcing bar member 10 embedded in the deck 92 may be arranged so as to be located at the supported portions 93A and 93B of the deck 92.

図３は、図２のＡ部の拡大図である。図４は、図２のＢ部の拡大図である。図５は、図２のＣ部の拡大図である。図３は、鉄筋部材１０の一方の端部２１Ａにおける主筋２０Ａ及び配力筋２２を示すものである。図４は、鉄筋部材１０の他方の端部２１Ｂにおける主筋２０Ｂ及び配力筋２２を示すものである。Ａ部の主筋２０Ａの幅寸法ａは、Ｂ部の主筋２０Ｂの幅寸法ｂに対し大きく形成されている。実施の形態１においては、Ａ部における主筋２０Ａの幅寸法ａは、例えば２０ｍｍで形成されている。また、Ｂ部における主筋２０Ｂの幅寸法ｂは、例えば７ｍｍで形成されている。鉄筋部材１０は、全域にわたって厚みが一定になっているため、Ａ部における主筋２０Ａの断面積は、Ｂ部における主筋２０Ｂの断面積よりも大きい。実施の形態１において、鉄筋部材１０の厚みは例えば６ｍｍで形成されているため、Ａ部における主筋２０Ａの断面積は１２０ｍｍ２であり、Ｂ部における主筋２０Ｂの断面積は４２ｍｍ２である。また、鉄筋部材１０の支間方向の中央部、つまり図２のＣ部の主筋２０も主筋２０Ａで構成されており、Ａ部と同じ断面積を有する。 FIG. 3 is an enlarged view of part A in FIG. FIG. 4 is an enlarged view of a portion B of FIG. FIG. 5 is an enlarged view of a portion C in FIG. FIG. 3 shows a main bar 20A and a force distribution bar 22 at one end 21A of the reinforcing bar member 10. FIG. 4 shows a main bar 20B and a force distribution bar 22 at the other end 21B of the reinforcing bar member 10. The width dimension a of the main bar 20A of the A portion is formed larger than the width dimension b of the main bar 20B of the B portion. In the first embodiment, the width dimension a of the main bar 20A in the part A is formed to be, for example, 20 mm. Further, the width dimension b of the main bar 20B in the portion B is formed to be, for example, 7 mm. Since the thickness of the reinforcing bar member 10 is constant over the entire area, the cross-sectional area of the main bar 20A in the portion A is larger than the cross-sectional area of the main bar 20B in the portion B. In the first embodiment, since the thickness of the reinforcing bar member 10 is formed to be, for example, 6 mm, the cross-sectional area of the main bar 20A in the A portion is 120 mm 2 , and the cross-sectional area of the main bar 20B in the B portion is 42 mm 2 . Further, the central portion of the reinforcing bar member 10 in the span direction, that is, the main reinforcing bar 20 of the portion C in FIG. 2 is also composed of the main reinforcing bar 20A and has the same cross-sectional area as the portion A.

床版９２の上面に荷重がかかった場合、支承９１Ａと支承９１Ｂとの中央部に最も大きな曲げモーメントがかかる。従って、床版９２は、中央部に支間方向の最大応力が発生するため、鉄筋部材１０の主筋２０は、その最大応力に対抗する必要がある。実施の形態１においては、床版９２の中央部に太い主筋２０Ａが配置されており、必要な強度が確保されている。 When a load is applied to the upper surface of the deck 92, the largest bending moment is applied to the central portion of the bearing 91A and the bearing 91B. Therefore, since the floor slab 92 generates the maximum stress in the span direction at the central portion, the main bar 20 of the reinforcing bar member 10 needs to counter the maximum stress. In the first embodiment, the thick main bar 20A is arranged in the central portion of the floor slab 92, and the required strength is secured.

図２に示される様に、実施の形態１においては、鉄筋部材１０の端部２１Ａから支間方向の全長の５／８の区間は、太い主筋２０Ａで構成されており、残りの端部２１Ｂ側の部分は、細い主筋２０Ｂで構成されている。このように構成されることにより、主筋２０間のピッチ寸法が小さい端部２１Ｂにおいても、主筋２０間の開口部の幅が中央部と同様に確保される。実施の形態１においては、中央部の主筋２０間の開口部の幅は、最小４８．２ｍｍであり、Ｂ部における主筋２０間の開口部の幅ｗは、最小５０．２ｍｍである。主筋２０間の開口部の幅ｗを所定の幅以上確保することにより、床版９２にコンクリート等の充填材を流し込む際に、充填材の流動を妨げることがない。また、Ｂ部における主筋２０Ｂは断面積が小さいが、床版９２の被支持部９３Ａ、９３Ｂにおいては、曲げモーメントが小さく発生する応力も小さいため、断面積が小さくても必要な強度が確保されている。 As shown in FIG. 2, in the first embodiment, the section of 5/8 of the total length in the span direction from the end 21A of the reinforcing bar member 10 is composed of the thick main bar 20A, and the remaining end 21B side. The portion of is composed of a thin main bar 20B. With this configuration, the width of the opening between the main bars 20 is secured as in the central portion even at the end portion 21B where the pitch dimension between the main bars 20 is small. In the first embodiment, the width of the opening between the main bars 20 in the central portion is a minimum of 48.2 mm, and the width w of the opening between the main bars 20 in the B portion is a minimum of 50.2 mm. By ensuring the width w of the opening between the main bars 20 to be a predetermined width or more, the flow of the filler is not hindered when the filler such as concrete is poured into the deck 92. Further, although the main bar 20B in the B portion has a small cross-sectional area, in the supported portions 93A and 93B of the deck 92, the bending moment is small and the generated stress is small, so that the required strength is secured even if the cross-sectional area is small. ing.

なお、床版９２にかかる曲げモーメントにより発生する応力の観点からは、鉄筋部材１０の一方の端部２１Ａの主筋２０の断面積は、中央部の主筋２０の断面積以下に構成しても良い。一方の端部２１Ａに発生する応力は、他方の端部２１Ｂと同様に中央部よりも小さいため、端部２１Ａの主筋２０の断面積を小さくすることにより、断面における鉄筋の密度を小さくすることができ、床版９２の重量を小さくすることができる。 From the viewpoint of the stress generated by the bending moment applied to the deck 92, the cross-sectional area of the main bar 20 of one end 21A of the reinforcing bar member 10 may be configured to be equal to or less than the cross-sectional area of the main bar 20 in the central portion. .. Since the stress generated in one end 21A is smaller than that in the center like the other end 21B, the density of the reinforcing bars in the cross section is reduced by reducing the cross-sectional area of the main bar 20 of the end 21A. The weight of the floor slab 92 can be reduced.

主筋２０及び配力筋２２は、格子形状の開口部２４に突出する突起部２５、２６をそれぞれ備える。突起部２５は、主筋２０の側面から開口部２４側に突出しており、１本の主筋２０の中心線について対称に設けられている。また、突起部２６は、配力筋２２の側面から開口部２４側に突出しており、配力筋２２の中心線について対称に設けられている。突起部２５、２６は、開口部２４に充填されるモルタル等の充填材と噛み合い、鉄筋部材１０と充填材とが一体となることにより、床版９２の強度が確保される。実施の形態１において、突起部２５、２６の突出量は、例えば５ｍｍに設定されている。 The main bar 20 and the force distribution bar 22 each include protrusions 25 and 26 protruding into the grid-shaped opening 24. The protrusion 25 projects from the side surface of the main bar 20 toward the opening 24, and is provided symmetrically with respect to the center line of one main bar 20. Further, the protrusion 26 projects from the side surface of the force distribution bar 22 toward the opening 24, and is provided symmetrically with respect to the center line of the force distribution bar 22. The protrusions 25 and 26 mesh with a filler such as mortar filled in the opening 24, and the reinforcing bar member 10 and the filler are integrated to ensure the strength of the deck 92. In the first embodiment, the protrusion amount of the protrusions 25 and 26 is set to, for example, 5 mm.

図６は、比較例の鉄筋部材１１０を適用した床版１９２の模式図である。床版１９２も、実施の形態１の床版９２と同様に、図１に示される様に橋脚９０Ａ上の支承９１Ａ及び橋脚９０Ｂ上の支承９１Ｂ上に支持されている。従来の鉄筋部材１１０においては、主筋１２０と配力筋１２２とが直交して構成され、主筋１２０はそれぞれ等間隔に平行に配置されている。床版１９２の一方の被支持部１９３Ａと他方の被支持部１９３Ｂとが異なる幅で構成されている場合、従来の鉄筋部材１１０は、一方の被支持部１９３Ａから延び他方の被支持部１９３Ｂに至らない主筋１２０Ａが発生してしまう。床版１９２の上面に荷重がかかり、曲げモーメントにより中央部に引っ張り応力が発生した場合に、被支持部１９３Ａから被支持部１９３Ｂまで繋がれていない主筋１２０Ａは、引っ張り応力に対抗することができず、コンクリートに引っ張り応力が負担される。特に図６中の領域Ｄは、引っ張り応力に対する強度が低い。 FIG. 6 is a schematic view of the floor slab 192 to which the reinforcing bar member 110 of the comparative example is applied. The deck 192 is also supported on the bearing 91A on the pier 90A and the bearing 91B on the pier 90B as shown in FIG. 1, similarly to the deck 92 of the first embodiment. In the conventional reinforcing bar member 110, the main reinforcing bars 120 and the force distribution bars 122 are configured at right angles, and the main reinforcing bars 120 are arranged in parallel at equal intervals. When one supported portion 193A and the other supported portion 193B of the deck 192 have different widths, the conventional reinforcing bar member 110 extends from one supported portion 193A to the other supported portion 193B. The main bar 120A that does not reach is generated. When a load is applied to the upper surface of the deck 192 and a tensile stress is generated in the central portion due to the bending moment, the main bar 120A which is not connected from the supported portion 193A to the supported portion 193B can counter the tensile stress. However, tensile stress is borne by the concrete. In particular, the region D in FIG. 6 has low strength against tensile stress.

また、比較例の鉄筋部材１１０を床版１９２に適用し、主筋１２０を支承線Ｐから支承線Ｑに至るようにするには、以下のように鉄筋部材１１０を配置する。例えば、床版１９２の一方の側面１９５Ａに主筋１２０を沿わせて配置する鉄筋部材１１０と、床版１９２の他方の側面１９５Ｂに主筋１２０を沿わせて配置する鉄筋部材１１０と、の２枚の鉄筋部材１１０を床版１９２に配置する。この場合、床版１９２に配置された２枚の鉄筋部材１１０は一部重なることになるため、床版１９２の厚みが大きくなる部分が発生する。 Further, in order to apply the reinforcing bar member 110 of the comparative example to the floor slab 192 and to make the main bar 120 from the support line P to the support line Q, the reinforcing bar member 110 is arranged as follows. For example, two pieces, a reinforcing bar member 110 in which the main bar 120 is arranged along one side surface 195A of the deck 192 and a reinforcing bar member 110 in which the main bar 120 is arranged along the other side surface 195B of the floor slab 192. The reinforcing bar member 110 is arranged on the floor slab 192. In this case, since the two reinforcing bar members 110 arranged on the floor slab 192 partially overlap each other, a portion where the thickness of the floor slab 192 becomes large is generated.

一方、実施の形態１に係る鉄筋部材１０においては、全ての主筋２０の一方の端部が支承線Ｐ上にあり、他方の端部が支承線Ｑ上にある。このように配置されているため、平面視において台形である床版９２の全面に主筋２０が均等に配置される。そして、床版９２は、各部において必要な強度が確保でき、床版９２の厚さも大きくすることなく鉄筋部材１０を配筋することができる。 On the other hand, in the reinforcing bar member 10 according to the first embodiment, one end of all the main bars 20 is on the support line P, and the other end is on the support line Q. Since they are arranged in this way, the main bars 20 are evenly arranged on the entire surface of the floor slab 92, which is trapezoidal in a plan view. The floor slab 92 can secure the required strength in each part, and the reinforcing bar member 10 can be arranged without increasing the thickness of the floor slab 92.

実施の形態２．
次に実施の形態２に係る鉄筋部材２１０及び橋梁２００について説明する。実施の形態２に係る橋梁２００は、実施の形態１に係る橋梁１００に複数の鉄筋部材２１０を配筋した場合について説明する。実施の形態２では、実施の形態１に対する変更点を中心に説明する。実施の形態２に係る鉄筋部材２１０及び橋梁２００の各部については、各図面において同一の機能を有するものは実施の形態１の説明で使用した図面と同一の符号を付して表示するものとする。 Embodiment 2.
Next, the reinforcing bar member 210 and the bridge 200 according to the second embodiment will be described. The bridge 200 according to the second embodiment describes a case where a plurality of reinforcing bar members 210 are arranged on the bridge 100 according to the first embodiment. In the second embodiment, the changes to the first embodiment will be mainly described. Regarding each part of the reinforcing bar member 210 and the bridge 200 according to the second embodiment, those having the same function in each drawing shall be indicated with the same reference numerals as those used in the description of the first embodiment. ..

図７は、実施の形態２に係る橋梁２００の床版２９２の平面図である。図７の床版２９２は、実施の形態１と同様に２つの橋脚９０に備えられた支承９１の上に上部構造として渡されている。図７の床版２９２は、一方の支承２９１Ａに支持される部分である被支持部２９３Ａと他方の支承２９１Ｂに支持される部分である被支持部２９３Ｂとを有する。被支持部２９３Ａと被支持部２９３Ｂとは、床版２９２の平面部に対し垂直上方から見た時に幅が異なっている。つまり、被支持部２９３Ａの幅寸法Ｗ３に対し被支持部２９３Ｂの幅寸法Ｗ４が小さくなっている。鉄筋部材２１０は、床版２９２の形状に従って平面部の全域にわたって複数枚配置されている。 FIG. 7 is a plan view of the floor slab 292 of the bridge 200 according to the second embodiment. The floor slab 292 of FIG. 7 is passed as a superstructure on the support 91 provided on the two piers 90 as in the first embodiment. The floor slab 292 of FIG. 7 has a supported portion 293A which is a portion supported by one bearing 291A and a supported portion 293B which is a portion supported by the other bearing 291B. The supported portion 293A and the supported portion 293B have different widths when viewed from above perpendicular to the flat surface portion of the deck slab 292. That is, the width dimension W4 of the supported portion 293B is smaller than the width dimension W3 of the supported portion 293A. A plurality of reinforcing bar members 210 are arranged over the entire flat surface portion according to the shape of the floor slab 292.

床版２９２には、領域Ｒと領域Ｓの２つの領域がある。床版２９２の一方の側面２９５Ａ側に位置する領域Ｒは、一方の被支持部２９３Ａ側の幅が広く他方の被支持部２９３Ｂ側が狭くなっている。床版２９２の他方の側面２９５Ｂ側に位置する領域Ｓは、一方の被支持部２９３Ａ側の幅と他方の被支持部２９３Ｂ側の幅とが同じであり、平行四辺形になっている。 The deck 292 has two regions, region R and region S. The region R located on one side surface 295A side of the deck 292 has a wide width on one supported portion 293A side and a narrow width on the other supported portion 293B side. The region S located on the other side surface 295B side of the deck 292 has the same width on one supported portion 293A side and the other width on the supported portion 293B side, and is a parallelogram.

図７に示される様に、領域Ｓは、平行四辺形の領域であり、格子状の鉄筋部材２１０Ｅ、２１０Ｆ、２１０Ｇ、２１０Ｈが並べられている。鉄筋部材２１０Ｅと鉄筋部材２１０Ｆとは、支間方向に並べられており、支間方向中央部において鉄筋部材２１０Ｅと鉄筋部材２１０Ｆとは重なりあっている。また、鉄筋部材２１０Ｇと鉄筋部材２１０Ｈも、同様に支間方向に並べられており、支間方向中央部において鉄筋部材２１０Ｇと鉄筋部材２１０Ｈとは重なりあっている。鉄筋部材２１０Ｅ、２１０Ｆ、２１０Ｇ、２１０Ｈは、主筋２２０が床版２９２の側面２９５Ｂと平行になっており、主筋２２０同士も平行に並んでいる。領域Ｓは、平行四辺形であるため、従来の鉄筋部材１１０のように主筋２２０が全て平行に並べられている鉄筋部材２１０Ｅ、２１０Ｆ、２１０Ｇ、２１０Ｈであってもよい。鉄筋部材２１０Ｅ、２１０Ｆ、２１０Ｇ、２１０Ｈの全ての主筋２２０は、一方の端部が支承線Ｐ上にあり、他方の端部が支承線Ｑ上にあるように配筋されている。そのため、領域Ｓは全ての領域において必要な強度を確保することができる。 As shown in FIG. 7, the region S is a parallelogram region, and the grid-like reinforcing bar members 210E, 210F, 210G, and 210H are arranged. The reinforcing bar member 210E and the reinforcing bar member 210F are arranged in the span direction, and the reinforcing bar member 210E and the reinforcing bar member 210F overlap each other in the central portion in the span direction. Further, the reinforcing bar member 210G and the reinforcing bar member 210H are also arranged in the span direction in the same manner, and the reinforcing bar member 210G and the reinforcing bar member 210H overlap each other in the central portion in the span direction. In the reinforcing bar members 210E, 210F, 210G, 210H, the main bars 220 are parallel to the side surface 295B of the deck 292, and the main bars 220 are also arranged in parallel. Since the region S is a parallelogram, it may be the reinforcing bar members 210E, 210F, 210G, 210H in which all the main reinforcing bars 220 are arranged in parallel as in the conventional reinforcing bar member 110. All the main reinforcing bars 220 of the reinforcing bar members 210E, 210F, 210G, and 210H are arranged so that one end is on the bearing line P and the other end is on the bearing line Q. Therefore, the region S can secure the required strength in all the regions.

領域Ｒは、一方の被支持部２９３Ａ側の幅と他方の被支持部２９３Ｂ側の幅とが異なっており、台形になっている。領域Ｒには、格子状の鉄筋部材２１０Ａ、２１０Ｂ、２１０Ｃ、２１０Ｄが並べられている。鉄筋部材２１０Ａと鉄筋部材２１０Ｂとは、支間方向に並べられており、支間方向中央部において鉄筋部材２１０Ａと鉄筋部材２１０Ｂとは重なり会っている。また、鉄筋部材２１０Ｃと鉄筋部材２１０Ｄも、同様に支間方向に並べられており、支間方向中央部において鉄筋部材２１０Ｃと鉄筋部材２１０Ｄとは重なりあっている。鉄筋部材２１０Ａは、それぞれ一方の被支持部２９３Ａ側にある端部２２１ＡＡが他方の被支持部２９３Ｂ側にある端部２２１ＡＢよりも幅が広く形成されている。言い換えると、鉄筋部材２１０Ａは、被支持部２９３Ｂ側から被支持部２９３Ａ側に向かって幅が徐々に広がる様に形成されている。なお、鉄筋部材２１０Ｂ、２１０Ｃ、２１０Ｄも鉄筋部材２１０Ａと同様に形成されている。 The region R has a trapezoidal shape in which the width of one supported portion 293A side and the width of the other supported portion 293B side are different. In the region R, lattice-shaped reinforcing bar members 210A, 210B, 210C, and 210D are arranged. The reinforcing bar member 210A and the reinforcing bar member 210B are arranged in the span direction, and the reinforcing bar member 210A and the reinforcing bar member 210B overlap each other in the central portion in the span direction. Further, the reinforcing bar member 210C and the reinforcing bar member 210D are also arranged in the span direction in the same manner, and the reinforcing bar member 210C and the reinforcing bar member 210D overlap each other in the central portion in the span direction. In the reinforcing bar member 210A, the end portion 221AA on the one supported portion 293A side is formed to be wider than the end portion 221AB on the other supported portion 293B side. In other words, the reinforcing bar member 210A is formed so that the width gradually increases from the supported portion 293B side to the supported portion 293A side. The reinforcing bar members 210B, 210C, and 210D are also formed in the same manner as the reinforcing bar members 210A.

鉄筋部材２１０Ａは、複数の主筋２２０を備える。主筋２２０は、実施の形態１に係る鉄筋部材１０と同様に、一方の端部２２１ＡＡから他方の端部２２１ＡＢに向かって直線状に延びている、また、鉄筋部材２１０Ａは、隣合った主筋２２０の間を接続するように配力筋２２２を備える。配力筋２２２は、主筋２２０に交わる方向に直線状に延びている。主筋２２０と配力筋２２２とは、表面が同一面を形成しており、鉄筋部材２１０Ａは、主筋２２０と配力筋２２２とにより格子状の一枚の板を形成している。なお、鉄筋部材２１０Ｂ、２１０Ｃ、２１０Ｄも鉄筋部材２１０Ａと同様な形状に形成されている。 The reinforcing bar member 210A includes a plurality of main bars 220. Similar to the reinforcing bar member 10 according to the first embodiment, the main bar 220 extends linearly from one end 221AA toward the other end 221AB, and the reinforcing bar member 210A is an adjacent main bar 220. A force distribution bar 222 is provided so as to connect between them. The force distribution bar 222 extends linearly in the direction intersecting the main bar 220. The surfaces of the main bar 220 and the force distribution bar 222 form the same surface, and the reinforcing bar member 210A forms a single grid-like plate by the main bar 220 and the force distribution bar 222. The reinforcing bar members 210B, 210C, and 210D are also formed in the same shape as the reinforcing bar member 210A.

鉄筋部材２１０Ａの主筋２２０は、間隔が鉄筋部材２１０Ａの幅の変化に従って広がっている。これは、鉄筋部材２１０Ｂ、２１０Ｃ、２１０Ｄにおいても同様である。なお、主筋２２０同士の幅とは、主筋２２０の中心線同士の間隔、すなわち主筋２２０のピッチ寸法を指す。 The distance between the main bars 220 of the reinforcing bar member 210A is widened according to the change in the width of the reinforcing bar member 210A. This also applies to the reinforcing bar members 210B, 210C and 210D. The width between the main bars 220 refers to the distance between the center lines of the main bars 220, that is, the pitch dimension of the main bars 220.

鉄筋部材２１０Ａの支間方向に並べられている鉄筋部材２１０Ｂは、一方の端部２２１ＢＡが鉄筋部材２１０Ａの他方の端部２２１ＡＢと同じ幅に形成されている。鉄筋部材２１０Ａの他方の端部２２１ＡＢと鉄筋部材２１０Ｂの一方の端部２２１ＢＡとは、重ね合わされており、幅及び主筋２２０のピッチが合うように形成されている。従って、床版２９２の平面視においては、鉄筋部材２１０Ａと鉄筋部材２１０Ｂとは、見た目上は支承線Ｐから支承線Ｑに至るまで一枚の鉄筋部材であるように並べられている。更に言うと、主筋２２０の支間方向におけるピッチの変化率は、鉄筋部材２１０Ａと鉄筋部材２１０Ｂとで同じになるように設定されている。また、鉄筋部材２１０Ｃと鉄筋部材２１０Ｄも、鉄筋部材２１０Ａと鉄筋部材２１０Ｂとの関係と同じ様に設定されている。 In the reinforcing bar member 210B arranged in the span direction of the reinforcing bar member 210A, one end portion 221BA is formed to have the same width as the other end portion 221AB of the reinforcing bar member 210A. The other end portion 221AB of the reinforcing bar member 210A and the one end portion 221BA of the reinforcing bar member 210B are overlapped with each other, and are formed so that the width and the pitch of the main reinforcing bar 220 match. Therefore, in the plan view of the floor slab 292, the reinforcing bar member 210A and the reinforcing bar member 210B are arranged so as to be one reinforcing bar member from the support line P to the support line Q in appearance. Furthermore, the rate of change in pitch of the main bar 220 in the span direction is set to be the same for the reinforcing bar member 210A and the reinforcing bar member 210B. Further, the reinforcing bar member 210C and the reinforcing bar member 210D are also set in the same manner as the relationship between the reinforcing bar member 210A and the reinforcing bar member 210B.

鉄筋部材２１０Ａは、一方の端部２２１ＡＡ側の主筋２２０の幅寸法に対し、他方の端部２２１ＡＢ側の主筋２２０の幅寸法が大きく形成されている。また、鉄筋部材２１０Ｂは、一方の端部２２１ＢＡ側の主筋２２０の幅寸法が、他方の端部２２１ＢＢ側の主筋２２０の幅寸法よりも大きく形成されている。つまり、床版２９２の一方の被支持部２９３Ａを含む領域を第１領域とし、他方の被支持部２９３Ｂを含む領域を第２領域とし、支間方向において第１領域と第２領域との間に位置する領域を第３領域とすると、第３領域に位置する主筋２２０の幅寸法が第１領域及び第２領域と比較して広く形成されている。すなわち、第３領域の主筋２２０は、断面積が第１領域及び第２領域の主筋２２０よりも大きい。 In the reinforcing bar member 210A, the width dimension of the main bar 220 on the other end portion 221AB side is larger than the width dimension of the main bar 220 on the one end portion 221AA side. Further, the reinforcing bar member 210B is formed so that the width dimension of the main bar 220 on the one end 221BA side is larger than the width dimension of the main bar 220 on the other end 221BB side. That is, the region including one supported portion 293A of the deck 292 is set as the first region, the region including the other supported portion 293B is set as the second region, and between the first region and the second region in the span direction. Assuming that the located region is the third region, the width dimension of the main bar 220 located in the third region is formed wider than that of the first region and the second region. That is, the main bar 220 in the third region has a cross section larger than that of the main bars 220 in the first region and the second region.

実施の形態２に係る床版２９２においては、第１領域は、床版２９２の一方の被支持部２９３Ａ側の１／５の領域であり、第２領域は、床版２９２の他方の被支持部２９３Ｂ側の１／５の領域である。第１領域及び第２領域は、支承９１Ａ及び支承９１Ｂに支持されている部位であるため、床版２９２に荷重がかかった場合であっても、大きな曲げモーメントがかからない。一方、第３領域は、支承９１Ａと支承９１Ｂとの間の中央部に位置するため、最も大きな曲げモーメントが係る部位である。そのため、第３領域の主筋２２０の断面積を大きくすることにより、床版２９２は大きな荷重に対し強度を十分確保できる。また、第２領域は、主筋２２０の間隔が狭いが、主筋２２０の幅を第３領域の主筋２２０よりも小さく構成しているため、主筋２２０の間の開口部の幅を大きくとることができる。 In the floor slab 292 according to the second embodiment, the first region is a region of 1/5 of the supported portion 293A side of one of the floor slabs 292, and the second region is the other supported portion of the floor slab 292. It is a 1/5 area on the part 293B side. Since the first region and the second region are portions supported by the bearings 91A and 91B, a large bending moment is not applied even when a load is applied to the deck slab 292. On the other hand, since the third region is located in the central portion between the bearing 91A and the bearing 91B, it is a portion to which the largest bending moment is applied. Therefore, by increasing the cross-sectional area of the main bar 220 in the third region, the deck slab 292 can sufficiently secure the strength against a large load. Further, although the distance between the main bars 220 is narrow in the second region, the width of the main bars 220 is smaller than that of the main bars 220 in the third region, so that the width of the opening between the main bars 220 can be increased. ..

図８は、実施の形態２に係る床版２９２の鉄筋部材２１０Ａ、２１０Ｂが重なっている部分の断面図である。図８は、床版２９２の支間方向に沿った鉛直方向の断面を一例として示している。鉄筋部材２１０Ｂは、床版２９２の一方の被支持部２９３Ａ側の端部２２１ＢＡに曲げ加工が施され、段差が形成されている。鉄筋部材２１０Ｂの端部２２１ＢＡが鉄筋部材２１０Ａの端部２２１ＡＢと重ね合わされ、重ね合わせた部分以外の鉄筋部材２１０Ａと鉄筋部材２１０Ｂとは、同一面上に配置される。この状態で鉄筋部材２１０Ａと鉄筋部材２１０Ｂとは、モルタル、コンクリート等の充填材７０中に埋め込まれる。このように構成されることにより、床版２９２に複数枚の鉄筋部材２１０を配置した場合に、鉄筋部材２１０を覆うモルタル等の充填材に段差や凸部を設けることなく鉄筋部材２１０を配筋することができる。なお、鉄筋部材２１０Ｃと鉄筋部材２１０Ｄ、鉄筋部材２１０Ｅと鉄筋部材２１０Ｆ、及び鉄筋部材２１０Ｇと鉄筋部材２１０Ｈも同様に重ね合わせられている。 FIG. 8 is a cross-sectional view of a portion of the floor slab 292 according to the second embodiment in which the reinforcing bar members 210A and 210B overlap. FIG. 8 shows an example of a vertical cross section of the deck 292 along the span direction. In the reinforcing bar member 210B, the end portion 221BA on the supported portion 293A side of one of the floor slabs 292 is bent to form a step. The end portion 221BA of the reinforcing bar member 210B is overlapped with the end portion 221AB of the reinforcing bar member 210A, and the reinforcing bar member 210A and the reinforcing bar member 210B other than the overlapped portion are arranged on the same surface. In this state, the reinforcing bar member 210A and the reinforcing bar member 210B are embedded in the filler 70 such as mortar and concrete. With this configuration, when a plurality of reinforcing bar members 210 are arranged on the floor slab 292, the reinforcing bar members 210 are arranged without providing steps or protrusions on the filler such as mortar that covers the reinforcing bar members 210. can do. The reinforcing bar member 210C and the reinforcing bar member 210D, the reinforcing bar member 210E and the reinforcing bar member 210F, and the reinforcing bar member 210G and the reinforcing bar member 210H are also superposed in the same manner.

図９は、実施の形態２に係る床版２９２の変形例を示す図である。図９の床版３９２は、図７の床版２９２よりも大きく、鉄筋部材Ａ－１～Ａ－１８の１８枚の鉄筋部材を割り付けて配筋したものである。鉄筋部材Ａ－１～Ａ－１８は、鉄筋部材１０、２１０Ａ～２１０Ｄと同様に床版３９２の一方の被支持部３９３Ａ側が他方の被支持部３９３Ｂ側に対し幅が広い格子状に形成されている。そして、鉄筋部材Ａ－１～Ａ－１８は、被支持部３９３Ｂ側から被支持部３９３Ａ側に向かって主筋間のピッチ寸法が徐々に広がる様に形成されているものである。 FIG. 9 is a diagram showing a modified example of the floor slab 292 according to the second embodiment. The floor slab 392 of FIG. 9 is larger than the floor slab 292 of FIG. 7, and 18 reinforcing bar members A-1 to A-18 are allocated and arranged. Similar to the reinforcing bar members 10, 210A to 210D, the reinforcing bar members A-1 to A-18 are formed in a grid pattern in which one supported portion 393A side of the deck 392 is wider than the other supported portion 393B side. There is. The reinforcing bar members A-1 to A-18 are formed so that the pitch dimension between the main reinforcing bars gradually expands from the supported portion 393B side to the supported portion 393A side.

図９に示される様に、サイズの大きい床版に鉄筋部材を配置する場合、複数枚を組み合わせて適用する必要がある。鉄筋部材Ａ－１～Ａ－１８は、製造上及び運搬の都合により大きさが所定範囲内に限定されるため、複数枚を組み合わせて床版３９２に適用している。図７においては、支間方向に鉄筋部材２１０を並べる場合、鉄筋部材２１０Ａと鉄筋部材２１０Ｂとを一対一で重ねて配置していた。しかし、図９においては、一枚の鉄筋部材に対し支間方向に向かって隣合う鉄筋部材が２つ以上になる箇所がある。例えば、鉄筋部材Ａ－１に対しては、鉄筋部材Ａ－４及び鉄筋部材Ａ－５が隣合っている。このように構成されることにより、床版３９２の幅方向においても複数の鉄筋部材が重ね合わされているため、広い幅の床版３９２であっても十分な強度を確保することができる。 As shown in FIG. 9, when arranging the reinforcing bar members on a large-sized floor slab, it is necessary to apply a combination of a plurality of reinforcing bars. Since the size of the reinforcing bar members A-1 to A-18 is limited within a predetermined range due to manufacturing and transportation reasons, a plurality of reinforcing bars are combined and applied to the floor slab 392. In FIG. 7, when the reinforcing bar members 210 are arranged in the span direction, the reinforcing bar members 210A and the reinforcing bar members 210B are arranged one-to-one on top of each other. However, in FIG. 9, there is a place where there are two or more reinforcing bar members adjacent to each other in the span direction with respect to one reinforcing bar member. For example, the reinforcing bar member A-4 and the reinforcing bar member A-5 are adjacent to the reinforcing bar member A-1. With this configuration, since a plurality of reinforcing bar members are overlapped even in the width direction of the floor slab 392, sufficient strength can be ensured even with a wide floor slab 392.

１０ 鉄筋部材、２０ 主筋、２０Ａ 主筋、２０Ｂ 主筋、２１Ａ 端部、２１Ｂ 端部、２２ 配力筋、２４ 開口部、２５ 突起部、２６ 突起部、７０ 充填材、９０ 橋脚、９０Ａ 橋脚、９０Ｂ 橋脚、９１ 支承、９１Ａ 支承、９１Ｂ 支承、９２ 床版、９３Ａ 被支持部、９３Ｂ 被支持部、１００ 橋梁、１１０ 鉄筋部材、１２０ 主筋、１２０Ａ 主筋、１２２ 配力筋、１９２ 床版、１９３Ａ 被支持部、１９３Ｂ 被支持部、１９５Ａ 側面、１９５Ｂ 側面、２００ 橋梁、２１０ 鉄筋部材、２１０Ａ 鉄筋部材、２１０Ｂ 鉄筋部材、２１０Ｃ 鉄筋部材、２１０Ｄ 鉄筋部材、２１０Ｅ 鉄筋部材、２１０Ｆ 鉄筋部材、２１０Ｇ 鉄筋部材、２１０Ｈ 鉄筋部材、２２０ 主筋、２２１ＡＡ 端部、２２１ＡＢ 端部、２２１ＢＡ 端部、２２１ＢＢ 端部、２２２ 配力筋、２９１Ａ 支承、２９１Ｂ 支承、２９２ 床版、２９３Ａ 被支持部、２９３Ｂ 被支持部、２９５Ａ 側面、２９５Ｂ 側面、３９２ 床版、３９３Ａ 被支持部、３９３Ｂ 被支持部、Ａ 幅寸法、Ａ－１～Ａ－１８ 鉄筋部材、Ｂ 幅寸法、Ｄ 領域、Ｐ 支承線、Ｑ 支承線、Ｒ 領域、Ｓ 領域、Ｗ１ 幅寸法、Ｗ２ 幅寸法、Ｗ３ 幅寸法、Ｗ４ 幅寸法。 10 Reinforcing bar members, 20 main bars, 20A main bars, 20B main bars, 21A ends, 21B ends, 22 bearing bars, 24 openings, 25 protrusions, 26 protrusions, 70 fillers, 90 bridge piers, 90A ridges, 90B ridges. , 91 bearings, 91A bearings, 91B bearings, 92 floor slabs, 93A supported parts, 93B supported parts, 100 bridges, 110 reinforcing bars, 120 main bars, 120A main bars, 122 distribution bars, 192 floor slabs, 193A supported parts. , 193B Supported Parts, 195A Sides, 195B Sides, 200 Bridges, 210 Reinforcing Bar Members, 210A Reinforcing Bar Members, 210B Reinforcing Bar Members, 210C Reinforcing Bar Members, 210D Reinforcing Bar Members, 210E Reinforcing Bar Members, 210F Reinforcing Bar Members, 210G Reinforcing Bar Members, 210H Reinforcing Bar Members , 220 main bars, 221AA ends, 221AB ends, 221BA ends, 221BB ends, 222 distribution bars, 291A bearings, 291B bearings, 292 floor slabs, 293A supported parts, 293B supported parts, 295A sides, 295B sides. , 392 floor slab, 393A supported part, 393B supported part, A width dimension, A-1 to A-18 reinforcing bar member, B width dimension, D area, P bearing line, Q bearing line, R area, S area, W1 width dimension, W2 width dimension, W3 width dimension, W4 width dimension.

Claims (11)

隣合って配置された２つの主筋を含む複数の主筋と、
隣合う前記２つの主筋の側面の間を連結する複数の配力筋と、を有し、格子状に形成された鉄筋部材であって、
前記２つの主筋の延びる方向において一方の端部における前記２つの主筋の間隔は、
前記２つの主筋の延びる方向において他方の端部における前記２つの主筋の間隔よりも広い、鉄筋部材。 Multiple main bars, including two main bars placed next to each other ,
A reinforcing bar member formed in a grid pattern, having a plurality of force distribution bars connecting between the side surfaces of the two adjacent main bars.
The distance between the two main bars at one end in the extending direction of the two main bars is
A reinforcing bar member that is wider than the distance between the two main bars at the other end in the extending direction of the two main bars. 前記２つの主筋及び前記複数の配力筋は、
表面が同一面となるように形成される、請求項１に記載の鉄筋部材。 The two main bars and the plurality of force distribution bars are
The reinforcing bar member according to claim 1, which is formed so that the surfaces are flush with each other. 前記２つの主筋のそれぞれの一方の端部における断面積は、
前記２つの主筋のそれぞれの他方の端部における断面積よりも大きい、請求項１又は２に記載の鉄筋部材。 The cross-sectional area at one end of each of the two main bars is
The reinforcing bar member according to claim 1 or 2, which is larger than the cross-sectional area at the other end of each of the two main bars. 前記２つの主筋のそれぞれの中央部における断面積は、
前記２つの主筋のそれぞれの他方の端部における断面積よりも大きい、請求項３に記載の鉄筋部材。 The cross-sectional area at the center of each of the two main bars is
The reinforcing bar member according to claim 3, which is larger than the cross-sectional area at the other end of each of the two main bars. 前記２つの主筋のそれぞれの一方の端部における断面積は、
前記２つの主筋のそれぞれの中央部における断面積以下である、請求項３又は４に記載の鉄筋部材。 The cross-sectional area at one end of each of the two main bars is
The reinforcing bar member according to claim 3 or 4, which is equal to or less than the cross-sectional area at the central portion of each of the two main bars. 前記複数の主筋は、
それぞれが互いに平行でない、請求項１～５の何れか１項に記載の鉄筋部材。 The plurality of main lines are
The reinforcing bar member according to any one of claims 1 to 5, each of which is not parallel to each other. 請求項１～６の何れか１項に記載の鉄筋部材が埋め込まれた床版を備え、
前記床版は、
下部構造によって支持される被支持部に前記鉄筋部材の前記２つの主筋の端部が位置する様に前記鉄筋部材が配筋された、鉄筋コンクリート構造物。 A floor slab in which the reinforcing bar member according to any one of claims 1 to 6 is embedded is provided.
The floor slab is
A reinforced concrete structure in which the reinforcing bar member is arranged so that the ends of the two main reinforcing bars of the reinforcing bar member are located on the supported portion supported by the lower structure. 請求項１～６の何れか１項に記載の鉄筋部材が埋め込まれた床版を備え、
前記床版は、
両端に下部構造により支持される被支持部を備え、
一方の被支持部から他方の被支持部に向かう支間方向に前記２つの主筋が延びるように、前記複数の鉄筋部材が配筋され、
前記床版の前記一方の被支持部は、
前記複数の鉄筋部材の何れかの前記鉄筋部材の前記一方の端部が位置し、
前記床版の前記他方の被支持部は、
前記複数の鉄筋部材の何れかの前記鉄筋部材の前記他方の端部が位置し、
前記支間方向において隣合う前記複数の鉄筋部材は、
前記一方の端部と前記他方の端部とが重なって配置される、鉄筋コンクリート構造物。 A floor slab in which the reinforcing bar member according to any one of claims 1 to 6 is embedded is provided.
The floor slab is
Equipped with supported parts supported by the lower structure at both ends,
The plurality of reinforcing bar members are arranged so that the two main reinforcing bars extend in the span direction from one supported portion to the other supported portion.
The one supported portion of the deck is
One end of the reinforcing bar member of any of the plurality of reinforcing bar members is located.
The other supported portion of the deck is
The other end of the reinforcing bar member of any of the plurality of reinforcing bar members is located .
The plurality of reinforcing bar members adjacent to each other in the span direction are
A reinforced concrete structure in which one end and the other end are arranged so as to overlap each other. 前記床版は、
前記一方の被支持部を含む第１領域と、
前記他方の被支持部を含む第２領域と、
前記支間方向において前記第１領域と前記第２領域との間に位置する第３領域と、を備え、
前記第３領域に位置する前記鉄筋部材の前記２つの主筋のそれぞれの断面積は、
前記第２領域に位置する前記鉄筋部材の前記２つの主筋のそれぞれの断面積よりも大きい、請求項８に記載の鉄筋コンクリート構造物。 The floor slab is
The first region including the one supported portion and
The second region including the other supported portion and
A third region located between the first region and the second region in the span direction is provided.
The cross-sectional area of each of the two main bars of the reinforcing bar member located in the third region is
The reinforced concrete structure according to claim 8, which is larger than the cross-sectional area of each of the two main bars of the reinforcing bar member located in the second region. 前記床版は、The floor slab is
前記一方の被支持部を含む第１領域と、 The first region including the one supported portion and
前記他方の被支持部を含む第２領域と、 The second region including the other supported portion and
前記支間方向において前記第１領域と前記第２領域との間に位置する第３領域と、を備え、 A third region located between the first region and the second region in the span direction is provided.
前記第３領域に位置する前記複数の主筋のそれぞれの断面積は、 The cross-sectional area of each of the plurality of main bars located in the third region is
前記第１領域に位置する前記複数の主筋のそれぞれの断面積よりも大きい、請求項８又は９に記載の鉄筋コンクリート構造物。 The reinforced concrete structure according to claim 8 or 9, which is larger than the cross-sectional area of each of the plurality of main bars located in the first region. 前記鉄筋部材は、The reinforcing bar member is
前記床版の表面に沿って配置されている、請求項８～１０の何れか１項に記載の鉄筋コンクリート構造物。 The reinforced concrete structure according to any one of claims 8 to 10, which is arranged along the surface of the deck.
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