JP2016199418A - Short fiber for reinforcement and short fiber-reinforced body obtained by using the fiber - Google Patents

Short fiber for reinforcement and short fiber-reinforced body obtained by using the fiber Download PDF

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JP2016199418A
JP2016199418A JP2015079613A JP2015079613A JP2016199418A JP 2016199418 A JP2016199418 A JP 2016199418A JP 2015079613 A JP2015079613 A JP 2015079613A JP 2015079613 A JP2015079613 A JP 2015079613A JP 2016199418 A JP2016199418 A JP 2016199418A
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fiber
short fiber
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reinforcing short
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JP6697175B2 (en
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竜一 近松
Ryuichi Chikamatsu
竜一 近松
一成 佐々木
Kazunari Sasaki
一成 佐々木
敏雄 野村
Toshio Nomura
敏雄 野村
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Obayashi Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a short fiber for reinforcement, the excellent tensile strength characteristic of which can be utilized sufficiently, and to provide a short fiber-reinforced body obtained by using the short fiber for reinforcement.SOLUTION: The short fiber 1 for reinforcement is constituted so that two pieces of linear fibrous bodies 3, 3, which are connected to each other, are extended to the directions different from each other from a bending place 2 being a common base end portion and a mutual opening angle of this embodiment becomes almost 90 degrees. The short fiber 1 for reinforcement is constituted so that a steel fiber, which has around 0.10-0.35 mm fiber diameter, around 10-60 mm fiber length and around 2,000-3,000 N/mmtensile strength, is bent in the vicinity of the center thereof so that the length of each of the linear fibrous bodies 3, 3, becomes around 5-30 mm.SELECTED DRAWING: Figure 1

Description

本発明は、主として土木建築構造物に用いられる補強用短繊維及びそれを用いた短繊維補強体に関する。   The present invention relates to a reinforcing short fiber mainly used in a civil engineering building structure and a short fiber reinforcing body using the same.

繊維補強コンクリートは、引張強度特性に優れた繊維と併用することで、引張に弱いコンクリートの弱点を補うものであって、長さが数ｍｍから数十ｍｍ程度の短繊維が添加混入されたものは、特に短繊維補強コンクリートと呼ばれる。   Fiber reinforced concrete, which is used in combination with fibers with excellent tensile strength properties, compensates for the weaknesses of concrete that is vulnerable to tension, and is mixed with short fibers with a length of several millimeters to several tens of millimeters Is particularly called short fiber reinforced concrete.

短繊維補強コンクリートは、開発当初においては、繊維によってフレッシュコンクリートの流動が妨げられるため、その用途が限られていたが、流動性に優れたセメント材料の開発に伴って適用範囲が拡がり、最近では、超高強度繊維補強コンクリート（ＵＦＣ）や、さらにその熱養生を不要にした常温硬化型の超高強度繊維補強コンクリートも開発されている。   Short fiber reinforced concrete was initially limited in its application because the flow of fresh concrete was hindered by fibers, but the scope of application has expanded with the development of cement materials with excellent fluidity. Ultra high strength fiber reinforced concrete (UFC) and room temperature curing type ultra high strength fiber reinforced concrete that does not require thermal curing have also been developed.

ここで、常温硬化型の超高強度繊維補強コンクリートは、現場での打設及び養生が可能であるため、施工規模や施工条件の制約が大幅に軽減されるほか、高強度かつ高流動が実現可能な特殊な粉体材料と超高強度鋼繊維とを用いることで、圧縮強度１８０Ｎ／ｍｍ2以上、引張強度８．８Ｎ／ｍｍ2以上を実現可能となり、優れた流動性や充填性と相俟って、部材の薄肉化とそれによる軽量化を図ることができる。 Here, room-temperature-curing ultra-high-strength fiber reinforced concrete can be cast and cured on site, greatly reducing restrictions on construction scale and construction conditions, and realizing high strength and high flow. By using a special powder material and ultra-high strength steel fiber, it is possible to achieve a compressive strength of 180 N / mm 2 or higher and a tensile strength of 8.8 N / mm 2 or higher. As a result, it is possible to reduce the thickness of the member and thereby reduce the weight.

特開平１０−１９４８０２号公報Japanese Patent Laid-Open No. 10-194802 特開２００１−２２０１９０号公報JP 2001-220190 A 特開２００２−３５６３５３号公報JP 2002-356353 A 特開２００４−１６８５８５号公報JP 2004-168585 A

一方、繊維補強コンクリートにおいては、フレッシュコンクリートの流動性が高いと、その流れ方向に沿って短繊維が配列される傾向にある。特に、超高強度繊維補強コンクリートの場合、フレッシュコンクリートの流動性がきわめて高いため、短繊維として剛性が高くかつ長さが比較的大きなもの、例えば１５ｍｍ程度の鋼繊維を用いた場合、上述した配向性は特に顕著となる。   On the other hand, in fiber reinforced concrete, when the flowability of fresh concrete is high, short fibers tend to be arranged along the flow direction. In particular, in the case of ultra-high-strength fiber reinforced concrete, the flowability of fresh concrete is extremely high. Therefore, when the short fiber has a high rigidity and a relatively long length, for example, a steel fiber having a length of about 15 mm, the orientation described above is used. The property becomes particularly remarkable.

その反面、上述した短繊維の配向性が一貫して顕れるというものではなく、実際には、フレッシュコンクリート同士の合流や鉄骨材あるいは型枠材との衝突によって流れがさまざまに変化するため、短繊維の配列状況は予想が困難となる。   On the other hand, the orientation of short fibers mentioned above does not appear consistently. Actually, the flow changes variously due to merging of fresh concrete and collision with steel frames or formwork materials. It is difficult to predict the state of arrangement.

そのため、設計においては、短繊維による引張強度の寄与を安全側に評価せざるを得ず、短繊維が持つ優れた引張強度特性を十分に生かすことができないという問題を生じていた。   Therefore, in the design, the contribution of the tensile strength due to the short fibers must be evaluated on the safe side, and there has been a problem that the excellent tensile strength characteristics possessed by the short fibers cannot be fully utilized.

なお、コンクリートとの密着性改善や短繊維同士の絡み合いを防止すべく、さまざまな形状の鋼繊維が提案されているが（特許文献１〜４）、それらの形状はいずれも全体として直線状であるため、上述した配向性の問題を解決することは難しい。   In addition, various shapes of steel fibers have been proposed in order to improve adhesion to concrete and prevent entanglement between short fibers (Patent Documents 1 to 4), but these shapes are all linear as a whole. Therefore, it is difficult to solve the above-mentioned orientation problem.

本発明は、上述した事情を考慮してなされたもので、短繊維が持つ優れた引張強度特性を十分に生かすことが可能な補強用短繊維及びそれを用いた短繊維補強体を提供することを目的とする。   The present invention has been made in consideration of the above-described circumstances, and provides a reinforcing short fiber capable of fully utilizing the excellent tensile strength characteristics of a short fiber and a short fiber reinforcing body using the same. With the goal.

上記目的を達成するため、本発明に係る補強用短繊維は請求項１に記載したように、フレッシュコンクリート又はフレッシュモルタルに添加混入されるとともに硬化後のコンクリート又はモルタルを補強するようになっている補強用短繊維において、
各基端部が共通基端部位として共有され該共通基端部位から相異なる方向に延びる複数の線状繊維体で構成するとともに、該線状繊維体の相互の開き角度を３０゜以上１５０゜以下としたものである。 In order to achieve the above object, the reinforcing short fiber according to the present invention is added to fresh concrete or fresh mortar and reinforces the concrete or mortar after curing as described in claim 1. In reinforcing short fibers,
Each base end portion is shared as a common base end portion and is composed of a plurality of linear fiber bodies extending in different directions from the common base end portion, and the mutual opening angle of the linear fiber bodies is 30 ° or more and 150 °. It is as follows.

また、本発明に係る補強用短繊維は、前記複数の線状繊維体を、互いに連続する２本の線状繊維体で構成したものである。   Moreover, the reinforcing short fiber according to the present invention comprises the plurality of linear fiber bodies composed of two linear fiber bodies that are continuous with each other.

また、本発明に係る補強用短繊維は、前記開き角度をほぼ９０゜としたものである。   The reinforcing short fiber according to the present invention has the opening angle of approximately 90 °.

また、本発明に係る補強用短繊維は、前記２本の線状繊維体のうち、一方を他方よりも長くしたものである。   The reinforcing short fiber according to the present invention is one in which one of the two linear fiber bodies is longer than the other.

また、本発明に係る補強用短繊維は、前記複数の線状繊維体を鋼製材料で構成したものである。   Further, the reinforcing short fiber according to the present invention comprises the plurality of linear fiber bodies made of a steel material.

また、本発明に係る短繊維補強体は請求項６に記載したように、請求項１乃至請求項５のいずれか一記載の補強用短繊維がフレッシュコンクリート又はフレッシュモルタルに添加混入された状態で該フレッシュコンクリート又はフレッシュモルタルを硬化させたものである。   The short fiber reinforcing body according to the present invention is, as described in claim 6, in a state where the reinforcing short fibers according to any one of claims 1 to 5 are added and mixed in fresh concrete or fresh mortar. The fresh concrete or fresh mortar is cured.

繊維補強コンクリートにおける短繊維の配向性は上述したようにフレッシュコンクリートやフレッシュモルタルの流れに依存するため、流れが一定の箇所では、その流れ方向に短繊維が配列される反面、流れが複雑な箇所では配列方向が予測できないという側面を併せ持つ、換言すれば不確実な異方性を持つものであり、その結果として、短繊維による引張強度を設計に十分反映させることができないことは既に述べた通りである。   As mentioned above, the orientation of short fibers in fiber reinforced concrete depends on the flow of fresh concrete and fresh mortar. Therefore, in the place where the flow is constant, the short fibers are arranged in the flow direction, but the flow is complicated. In addition, it has an aspect that the direction of alignment cannot be predicted.In other words, it has uncertain anisotropy, and as a result, the tensile strength due to short fibers cannot be fully reflected in the design, as already mentioned. It is.

かかる状況に鑑み、本出願人は、短繊維による引張強度を、その大きさがある程度制限されるとしても、コンクリートやモルタルの強度に確実に反映させることができないかに着眼して研究開発を行ったところ、本願発明をなしたものであって、本願各発明に係る補強用短繊維は、各基端部が共通基端部位として共有され該共通基端部位から相異なる方向に延びる複数の線状繊維体で構成するとともに、該線状繊維体の相互の開き角度を３０゜以上１５０゜以下としてある。   In view of such circumstances, the present applicant has conducted research and development focusing on whether the tensile strength of short fibers cannot be reliably reflected in the strength of concrete or mortar, even if the size is limited to some extent. As a result, the short fiber for reinforcement according to each invention of the present application has a plurality of lines extending in different directions from the common base end portion, each base end portion being shared as a common base end portion. The linear fiber body has an opening angle of 30 ° to 150 °.

このようにすると、補強用短繊維は、該補強用短繊維が添加混入されたフレッシュコンクリートやフレッシュモルタルの打設時の流れに対し、対称形状の場合には、一定の姿勢をとらず、流れ方向とは無関係なランダムな姿勢をとりやすくなり、非対称形状の場合には、複数の線状繊維体のうち、いずれかの線状繊維体が流れ方向に沿った方向を向き、他の線状繊維体が開き角度で決定される所定の方向を向きやすくなる。   In this case, the reinforcing short fiber does not take a fixed posture in the case of a symmetrical shape with respect to the flow at the time of placing fresh concrete or fresh mortar in which the reinforcing short fiber is added and mixed. It becomes easy to take a random posture unrelated to the direction, and in the case of an asymmetric shape, one of the plurality of linear fiber bodies faces the direction along the flow direction, and the other linear The fiber body can easily face a predetermined direction determined by the opening angle.

そのため、フレッシュコンクリートやフレッシュモルタルが硬化した後のコンクリートやモルタルにおいては、補強用短繊維が対称形状の場合には、補強用短繊維の引張強度が全方位でそれらの引張強度に反映され、非対称形状の場合には、流れ方向と上述した所定方向に沿って補強用短繊維の引張強度がそれらの引張強度に反映されることとなり、かくして引張強度に関して不確実な異方性を生じていた従来の繊維補強コンクリートとは異なり、短繊維の引張強度を十分な大きさでコンクリートやモルタルの設計に確実に反映させることが可能となる。   Therefore, in the concrete and mortar after hardening of fresh concrete and fresh mortar, when the reinforcing short fibers are symmetrical, the tensile strength of the reinforcing short fibers is reflected in their tensile strength in all directions, and asymmetric In the case of the shape, the tensile strength of the reinforcing short fibers is reflected in the tensile strength along the flow direction and the predetermined direction described above, and thus the uncertain anisotropy with respect to the tensile strength has been generated. Unlike the fiber reinforced concrete, the tensile strength of the short fiber can be reliably reflected in the design of concrete or mortar with a sufficient size.

また、共通基端部位から延びる複数の線状繊維体は、いずれかがいずれかの定着部として機能し得るため、コンクリートやモルタルに対する付着強度が大幅に改善されるという作用効果も奏する。   In addition, since any one of the plurality of linear fiber bodies extending from the common base end portion can function as any fixing portion, there is an effect that adhesion strength to concrete or mortar is greatly improved.

共通基端部位から相異なる方向に延びるとは、複数の線状繊維体が２本で構成される場合には、該２本の線状繊維体が上述した開き角度をもって、Ｌ字状、Ｖ字状あるいはへの字状に形成された形態を意味するものであって、１本の短繊維を折り曲げて構成する場合にはその折れ曲がり箇所が、２本の短繊維を接合して構成する場合にはそれらの相互接合箇所がそれぞれ共通基端部位となり、前者の構成が本発明に係る補強用短繊維の典型例となる。   Extending in a different direction from the common proximal end portion means that when a plurality of linear fiber bodies are constituted by two pieces, the two linear fiber bodies have an L-shape, V Means a shape formed in a letter shape or a round shape, and in the case where one short fiber is bent and configured, the bent portion is formed by joining two short fibers These mutual joint portions serve as common base end portions, and the former configuration is a typical example of the reinforcing short fibers according to the present invention.

この補強用短繊維を製作するには、短繊維を中間体としていったん作製した後、該短繊維を途中で折り曲げるようにしたり、長尺状の繊維を加工機から押し出しながら、折曲げと切断を繰り返し行うようにしたりすればよい。   In order to produce this reinforcing short fiber, once the short fiber is produced as an intermediate, the short fiber is bent in the middle, or the long fiber is extruded from the processing machine and bent and cut. It may be performed repeatedly.

一方、複数の線状繊維体が３本以上で構成される場合には、各線状繊維体が放射状に延びる形態を意味するものであって、この場合には放射中心箇所が共通基端部位となる。   On the other hand, when the plurality of linear fiber bodies are constituted by three or more, it means a form in which each linear fiber body extends radially, and in this case, the radial center portion is a common base end portion. Become.

この補強用短繊維を製作するには、例えば長尺状の繊維で立体格子を持つマット状あるいはブロック状の中間体をいったん作製し、これを粉砕した上、必要に応じて振動篩等による選別を行いつつ、該粉砕物から格子近傍部分だけを取り出すようにすればよい。この場合、格子点が共通基端部位となり、該格子点から延びる繊維部分が複数の線状繊維体となる。   In order to produce this reinforcing short fiber, for example, a mat-like or block-like intermediate body having a three-dimensional lattice made of long fibers is once produced, pulverized, and then sorted by a vibration sieve or the like as necessary. It is only necessary to take out only the vicinity of the lattice from the pulverized product. In this case, the lattice point becomes a common base end portion, and the fiber portion extending from the lattice point becomes a plurality of linear fiber bodies.

複数の線状繊維体が互いになす開き角度を３０゜以上１５０゜以下としたのは、３０゜未満の角度、あるいは１５０゜を上回る角度とすると、直線状に近くなるためにフレッシュコンクリートやフレッシュモルタルの流れに対して配向性を有する結果となり、直線状をなす従来の短繊維と何ら変わりがなくなるからである。   The reason why the opening angle formed by a plurality of linear fiber bodies is 30 ° or more and 150 ° or less is that if the angle is less than 30 ° or more than 150 °, it becomes close to a straight line. This is because there is no change from the conventional short fibers having a linear shape.

ここで、複数の線状繊維体が２本で構成される場合、開き角度をほぼ９０゜としたならば、製作や品質管理の容易性が高まる。   Here, in the case where the plurality of linear fiber bodies are composed of two pieces, if the opening angle is approximately 90 °, the ease of production and quality control is enhanced.

また、２本の線状繊維体のそれぞれを同一長さとしてもかまわないが、一方を他方よりも長くしたならば、補強用短繊維が非対称形状となるため、長い方の線状繊維体がフレッシュコンクリート等の打設時の流れと同じ方向を向く一方、短い方の線状繊維体が開き角度で決まる所定の方向を向くこととなり、フレッシュコンクリート等の流れが一定である場合には、その流れ方向と上述した所定方向に沿って補強用短繊維の引張強度をコンクリート等の強度に反映させることが可能となる。   Each of the two linear fiber bodies may have the same length, but if one is made longer than the other, the reinforcing short fibers become asymmetrical, so the longer linear fiber body When the flow of fresh concrete or the like is directed in the same direction as the flow at the time of placing fresh concrete or the like, while the shorter linear fiber body is directed in a predetermined direction determined by the opening angle. It is possible to reflect the tensile strength of the reinforcing short fibers in the strength of the concrete or the like along the flow direction and the predetermined direction described above.

本発明の補強用短繊維は、従来公知の短繊維を用いて任意に構成することが可能であり、金属繊維、炭素繊維、アラミド繊維及び高強度ポリエチレン繊維（例えば東洋紡績株式会社から「ダイニーマ」（登録商標）の商品名で市販されているもの）等から適宜選択することができるとともに、金属繊維としては、鋼繊維、ステンレス繊維、アモルファス合金繊維等を用いて構成することができるが、複数の線状繊維体を鋼製材料で構成したならば、合理的なコストでコンクリートやモルタルに十分な引張強度を付与することが可能となる。   The reinforcing short fibers of the present invention can be arbitrarily configured using conventionally known short fibers, such as metal fibers, carbon fibers, aramid fibers, and high-strength polyethylene fibers (for example, “Dyneema” from Toyobo Co., Ltd.). (Commercially available under the trade name of (Registered Trademark)) and the like, and the metal fiber can be composed of steel fiber, stainless steel fiber, amorphous alloy fiber, etc. If the linear fiber body is made of a steel material, sufficient tensile strength can be imparted to concrete or mortar at a reasonable cost.

本実施形態に係る補強用短繊維１を示した図であり、(a)は平面図、(b)はＡ−Ａ線方向から見た矢視図。It is the figure which showed the short fiber 1 for reinforcement which concerns on this embodiment, (a) is a top view, (b) is the arrow line view seen from the AA line direction. 本実施形態に係る補強用短繊維１の作用を示した説明図であり、(a)は補強用短繊維１の姿勢を示した図、(b)は従来の短繊維の姿勢を示した図。It is explanatory drawing which showed the effect | action of the short fiber 1 for reinforcement which concerns on this embodiment, (a) is the figure which showed the attitude | position of the short fiber 1 for reinforcement, (b) The figure which showed the attitude | position of the conventional short fiber . 変形例に係る補強用短繊維を示した平面図。The top view which showed the short fiber for reinforcement which concerns on a modification. 別の変形例に係る補強用短繊維を示した平面図。The top view which showed the short fiber for reinforcement which concerns on another modification. 図４に示した変形例に係る補強用短繊維の姿勢を示した説明図。Explanatory drawing which showed the attitude | position of the short fiber for reinforcement which concerns on the modification shown in FIG. 別の変形例に係る補強用短繊維を示した図であり、(a)は補強用短繊維の斜視図、(b)は製作の様子を示した斜視図。FIG. 8 is a view showing a reinforcing short fiber according to another modification, (a) is a perspective view of the reinforcing short fiber, and (b) is a perspective view showing a state of production.

以下、本発明に係る補強用短繊維及びそれを用いた短繊維補強体の実施の形態について、添付図面を参照して説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a reinforcing short fiber and a short fiber reinforcing body using the same will be described with reference to the accompanying drawings.

図１は、本実施形態に係る補強用短繊維を示した図である。同図に示すように、本実施形態に係る補強用短繊維１は、互いに連続する２本の線状繊維体３，３を、共通基端部位としての折れ曲がり箇所２から相異なる方向に延びるように、本実施形態では相互の開き角度がほぼ９０゜となるように構成してある。   FIG. 1 is a view showing a reinforcing short fiber according to the present embodiment. As shown in the figure, the reinforcing short fiber 1 according to the present embodiment has two linear fiber bodies 3 and 3 extending from each other in a different direction from a bent portion 2 as a common base end portion. In the present embodiment, the mutual opening angle is approximately 90 °.

補強用短繊維１は例えば、繊維径が０．１０〜０．３５ｍｍ程度、繊維長が１０〜６０ｍｍ程度、引張強度が２０００〜３０００Ｎ／ｍｍ2程度の鋼繊維を、線状繊維体３，３の長さがそれぞれ５〜３０ｍｍ程度となるように中央近傍で折り曲げて構成することができる。なお、線状繊維体３，３の長さは、粗骨材の最大寸法よりも大きくなるように設定する。 The reinforcing short fiber 1 is, for example, a steel fiber having a fiber diameter of about 0.10 to 0.35 mm, a fiber length of about 10 to 60 mm, and a tensile strength of about 2000 to 3000 N / mm 2 , and linear fiber bodies 3 and 3. Can be configured to be bent in the vicinity of the center so that the length of each becomes about 5 to 30 mm. In addition, the length of the linear fiber bodies 3 and 3 is set so that it may become larger than the largest dimension of a coarse aggregate.

補強用短繊維１を用いて短繊維補強体としての短繊維補強コンクリートを構築するには、フレッシュコンクリートに補強用短繊維１が添加混入されるよう、セメントを主体とした粉体材料、細骨材、粗骨材及び水並びに補強用短繊維１を適宜配合する。   In order to construct a short fiber reinforced concrete as a short fiber reinforcing body using the reinforcing short fibers 1, a cement-based powder material, fine bone so that the reinforcing short fibers 1 are added and mixed in the fresh concrete. Lumber, coarse aggregate, water, and reinforcing short fibers 1 are appropriately blended.

各種配合材料やそれらの配合量は、要求されている圧縮強度や引張強度あるいは靭性を考慮しつつ、補強用短繊維１を添加混入したフレッシュコンクリートが十分な流動性を有するように適宜選択し決定する。   Various blending materials and blending amounts thereof are appropriately selected and determined so that the fresh concrete mixed with the reinforcing short fiber 1 has sufficient fluidity in consideration of the required compressive strength, tensile strength or toughness. To do.

次に、補強用短繊維１が添加混入されたフレッシュコンクリートを型枠内に投入し、その高流動性を生かしてすみずみに充填するが、本実施形態では、補強用短繊維１を、互いに連続する２本の線状繊維体３，３の相互の開き角度がほぼ９０゜となるようにかつ２本の線状繊維体３，３の長さが同じになるように構成してあるので、補強用短繊維１は、図２(a)に示すように該補強用短繊維が添加混入されたフレッシュコンクリート２１の打設時の流れに対して一定の姿勢をとらず、流れ方向とは無関係なランダムな姿勢をとりやすくなる。   Next, the fresh concrete mixed with the reinforcing short fibers 1 is put into the mold and filled into every corner by taking advantage of its high fluidity. In this embodiment, the reinforcing short fibers 1 are mutually connected. Since the opening angle between two continuous linear fiber bodies 3 and 3 is approximately 90 ° and the length of the two linear fiber bodies 3 and 3 is the same. As shown in FIG. 2 (a), the reinforcing short fiber 1 does not take a fixed posture with respect to the flow at the time of placing the fresh concrete 21 to which the reinforcing short fiber is added and mixed. It becomes easy to take an unrelated random posture.

そのため、補強用短繊維１は、硬化したコンクリートにおいて全方位で一定の引張強度を発揮する。   Therefore, the reinforcing short fiber 1 exhibits a certain tensile strength in all directions in the hardened concrete.

ちなみに、同図(b)に示すように、直線状をなす従来の補強用短繊維２２の場合には、フレッシュコンクリート２１の流れ方向に沿った配向性を示すため、同図水平方向に沿った引張強度の寄与はほとんど期待できず、なおかつ流れが変化することによる配向性の乱れを考慮すれば、上述の引張強度を安全側に評価せざるを得なくなる。   Incidentally, as shown in FIG. 5B, in the case of the conventional reinforcing short fiber 22 having a linear shape, the orientation along the flow direction of the fresh concrete 21 is shown. The contribution of the tensile strength can hardly be expected, and the above-described tensile strength must be evaluated on the safe side if the disorder of the orientation due to the change in flow is taken into consideration.

以上説明したように、本実施形態に係る補強用短繊維１によれば、該補強用短繊維が添加混入された短繊維補強コンクリート全体でみれば、引張強度が全方位で発揮されることとなり、かくして引張強度に関して不確実な異方性を生じていた従来の繊維補強コンクリートとは異なり、補強用短繊維１を構成する短繊維の引張強度をコンクリートの引張強度に確実に反映させることが可能となる。   As described above, according to the reinforcing short fiber 1 according to the present embodiment, the tensile strength is exhibited in all directions when viewed in the entire short fiber reinforced concrete to which the reinforcing short fiber is added and mixed. Thus, unlike the conventional fiber reinforced concrete that has caused uncertain anisotropy with respect to the tensile strength, it is possible to reliably reflect the tensile strength of the short fibers constituting the reinforcing short fiber 1 in the tensile strength of the concrete. It becomes.

また、本実施形態に係る補強用短繊維１によれば、折れ曲がり箇所２から延びる複数の線状繊維体３，３のうち、一方が他方の定着部として機能し得るため、コンクリートに対する付着強度が大幅に改善されるという作用効果も奏する。   In addition, according to the reinforcing short fiber 1 according to the present embodiment, one of the plurality of linear fiber bodies 3 and 3 extending from the bent portion 2 can function as the other fixing portion, and therefore the adhesion strength to the concrete is high. There is also an effect that it is greatly improved.

本実施形態では、本発明をコンクリートに適用した例として説明したが、これに代えて、本発明をモルタルに適用してもかまわない。   Although the present embodiment has been described as an example in which the present invention is applied to concrete, the present invention may be applied to mortar instead.

また、本実施形態では、本発明の補強用短繊維を、１本の鋼製短繊維を折り曲げて構成したが、どのような工程で本発明の補強用短繊維を製作するかは任意であって、長尺状の鋼繊維を加工機から押し出しながら、折曲げと切断を繰り返し行うようにしてもかまわない。   Further, in this embodiment, the reinforcing short fiber of the present invention is configured by bending one steel short fiber, but it is arbitrary in what process the reinforcing short fiber of the present invention is manufactured. Then, the long steel fiber may be repeatedly bent and cut while being extruded from the processing machine.

また、本実施形態では、本発明の補強用短繊維を、折れ曲がり箇所２を共通基端部位として該折れ曲がり箇所から２方向に延びる鋼製の線状繊維体３，３で構成したが、共通基端部位が折れ曲がり箇所である必要はなく、接合箇所でもよいし、折れ曲がり状の一体成形箇所でもかまわない。後者の例としては、共通基端部位から相異なる２方向に延びるように成形されてなるアラミド繊維や高強度ポリエチレン繊維で構成する場合が上げられる。なお、全体形状としては、図１とほぼ同様であるため、図面を用いた説明は省略する。   Further, in this embodiment, the reinforcing short fiber of the present invention is configured by the steel linear fiber bodies 3 and 3 extending in two directions from the bent portion with the bent portion 2 as the common base end portion. The end part does not need to be a bent part, and may be a joined part or a bent integrally formed part. As an example of the latter, the case where it comprises with the aramid fiber formed so that it may extend in two different directions from a common base end site | part and a high intensity | strength polyethylene fiber is raised. The overall shape is substantially the same as that shown in FIG.

また、本実施形態では、本発明の補強用短繊維を、相互の開き角度がほぼ９０゜となるように形成された２本の線状繊維体３，３からなる補強用短繊維１で構成したが、２本の線状繊維体がなす開き角度は、３０゜以上１５０゜以下の範囲で任意に定めればよい。図３は、上述の開き角度が６０゜と１２０゜である補強用短繊維３１ａ，３１ｂをそれぞれ示したものである。   In this embodiment, the reinforcing short fiber of the present invention is composed of the reinforcing short fiber 1 composed of the two linear fiber bodies 3 and 3 formed so that the opening angle between them is approximately 90 °. However, the opening angle formed by the two linear fiber bodies may be arbitrarily determined in the range of 30 ° to 150 °. FIG. 3 shows the reinforcing short fibers 31a and 31b having the aforementioned opening angles of 60 ° and 120 °, respectively.

また、本実施形態では、本発明の補強用短繊維を、同じ長さとなるように形成された２本の線状繊維体３，３からなる補強用短繊維１で構成したが、２本の線状繊維体の長さは必ずしも同じである必要はない。図４は、開き角度が９０゜、６０゜、１２０゜である場合に２本の線状繊維体の長さがそれぞれ異なる補強用短繊維４１ａ，４１ｂ，４１ｃをそれぞれ示したものである。   In the present embodiment, the reinforcing short fiber of the present invention is composed of the reinforcing short fibers 1 composed of the two linear fiber bodies 3 and 3 formed to have the same length. The lengths of the linear fiber bodies are not necessarily the same. FIG. 4 shows reinforcing short fibers 41a, 41b, and 41c having different lengths of two linear fiber bodies when the opening angles are 90 °, 60 °, and 120 °, respectively.

かかる変形例においては、補強用短繊維４１ａ，４１ｂ，４１ｃは、非対称形状であるため、２本の線状繊維体のうち、より長い方の線状繊維体がフレッシュコンクリート２１の流れ方向を向き、短い方の線状繊維体が開き角度で決まる方向を向く。   In such a modification, the reinforcing short fibers 41a, 41b, 41c are asymmetrical, and therefore the longer linear fiber body of the two linear fiber bodies faces the flow direction of the fresh concrete 21. The shorter linear fiber body faces the direction determined by the opening angle.

例えば開き角度が４５゜の補強用短繊維４１ｄであれば、図５に示すように、該補強用短繊維の引張強度は、フレッシュコンクリート２１の流れ方向と該流れ方向に対して４５゜をなす２つの方向、計３つの異なる方向に沿って発揮されることとなり、フレッシュコンクリート２１の流れが一定の場合には、補強用短繊維４１ｄの引張強度をこれら３つの方向に沿ってコンクリートの引張強度に反映させることが可能となる。   For example, if the reinforcing short fiber 41d has an opening angle of 45 °, the tensile strength of the reinforcing short fiber is 45 ° with respect to the flow direction of the fresh concrete 21 and the flow direction, as shown in FIG. When the flow of the fresh concrete 21 is constant, the tensile strength of the reinforcing short fiber 41d is set to the tensile strength of the concrete along these three directions. It is possible to reflect on.

また、本実施形態では、本発明の補強用短繊維を、２本の線状繊維体３，３からなる補強用短繊維１で構成したが、線状繊維体の本数は必ずしも２本である必要はなく、図６に示すように、例えば直交３軸方向にそれぞれ放射状に延びる３本の線状繊維体５２からなる補強用短繊維５１で構成することが可能である。   In the present embodiment, the reinforcing short fibers of the present invention are constituted by the reinforcing short fibers 1 composed of the two linear fiber bodies 3 and 3, but the number of the linear fiber bodies is not necessarily two. There is no need, and as shown in FIG. 6, for example, it is possible to configure the reinforcing short fibers 51 composed of three linear fiber bodies 52 extending radially in the three orthogonal directions.

この場合、同図(b)に示すように、立体格子を持つマット状の中間体５３を長尺状の繊維５４でいったん作製し、これを粉砕した上、必要に応じて振動篩等による選別を行いつつ、該粉砕物から同図破線で囲んだ格子近傍部分５５だけを取り出すようにすればよい。この場合、格子点が共通基端部位となり、該格子点から延びる繊維部分が複数の線状繊維体となる。   In this case, as shown in FIG. 4B, a mat-like intermediate 53 having a three-dimensional lattice is once produced with long fibers 54, pulverized, and sorted by a vibrating sieve or the like as necessary. It is only necessary to take out only the lattice vicinity 55 surrounded by the broken line in FIG. In this case, the lattice point becomes a common base end portion, and the fiber portion extending from the lattice point becomes a plurality of linear fiber bodies.

１ 補強用短繊維
２ 折れ曲がり箇所（共通基端部位）
３ 線状繊維体
２１ フレッシュコンクリート
３１ａ，３１ｂ，４１ａ，４１ｂ，４１ｃ，４１ｄ，５１
補強用短繊維 1 Short fiber for reinforcement 2 Bent part (common base part)
3 Linear fiber body 21 Fresh concrete 31a, 31b, 41a, 41b, 41c, 41d, 51
Short fiber for reinforcement

Claims (6)

フレッシュコンクリート又はフレッシュモルタルに添加混入されるとともに硬化後のコンクリート又はモルタルを補強するようになっている補強用短繊維において、
各基端部が共通基端部位として共有され該共通基端部位から相異なる方向に延びる複数の線状繊維体で構成するとともに、該線状繊維体の相互の開き角度を３０゜以上１５０゜以下としたことを特徴とする補強用短繊維。 In the reinforcing short fiber which is added to fresh concrete or fresh mortar and is intended to reinforce the concrete or mortar after curing,
Each base end portion is shared as a common base end portion and is composed of a plurality of linear fiber bodies extending in different directions from the common base end portion, and the mutual opening angle of the linear fiber bodies is 30 ° or more and 150 °. A reinforcing short fiber characterized by: 前記複数の線状繊維体を、互いに連続する２本の線状繊維体で構成した請求項１記載の補強用短繊維。 The reinforcing short fiber according to claim 1, wherein the plurality of linear fiber bodies are constituted by two linear fiber bodies that are continuous with each other. 前記開き角度をほぼ９０゜とした請求項２記載の補強用短繊維。 The reinforcing short fiber according to claim 2, wherein the opening angle is approximately 90 °. 前記２本の線状繊維体のうち、一方を他方よりも長くした請求項２又は請求項３記載の補強用短繊維。 The reinforcing short fiber according to claim 2 or 3, wherein one of the two linear fiber bodies is longer than the other. 前記複数の線状繊維体を鋼製材料で構成した請求項１乃至請求項４のいずれか一記載の補強用短繊維。 The reinforcing short fiber according to any one of claims 1 to 4, wherein the plurality of linear fiber bodies are made of a steel material. 請求項１乃至請求項５のいずれか一記載の補強用短繊維がフレッシュコンクリート又はフレッシュモルタルに添加混入された状態で該フレッシュコンクリート又はフレッシュモルタルを硬化させたことを特徴とする短繊維補強体。 6. A short fiber reinforcing body, wherein the fresh concrete or fresh mortar is cured in a state where the reinforcing short fibers according to any one of claims 1 to 5 are added and mixed in the fresh concrete or fresh mortar.
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JP6405066B1 (en) * 2018-04-05 2018-10-17 株式会社 天野ミューテック Metal fiber and concrete structure using the same
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