JP2627046B2 - Steel fiber for concrete reinforcement - Google Patents
Steel fiber for concrete reinforcementInfo
- Publication number
- JP2627046B2 JP2627046B2 JP5103759A JP10375993A JP2627046B2 JP 2627046 B2 JP2627046 B2 JP 2627046B2 JP 5103759 A JP5103759 A JP 5103759A JP 10375993 A JP10375993 A JP 10375993A JP 2627046 B2 JP2627046 B2 JP 2627046B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- bending
- fiber
- width
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Reinforcement Elements For Buildings (AREA)
- Inorganic Fibers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はコンクリートに混入させ
てその強度を補強する目的で使用されるコンクリート補
強用繊維に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete reinforcing fiber used for reinforcing concrete by mixing it with concrete.
【０００２】[0002]
【従来の技術】土木建築分野で使用されるコンクリート
は圧縮に対しては高い強度を示すが、引張り強度は圧縮
強度の約1/10程度と低くため、ひび割れを起し易く、ま
た一挙に崩壊するという欠点がある。これらの欠点を補
う目的で鉄筋や鋼線が補強材として使用されてきたが、
近年、直径０．４〜１．０mm、長さ２５〜８０mmの鋼繊
維を、対コンクリート容積比で０．３〜２％程度コンク
リートに混入させた鋼繊維補強コンクリート（ＳＦＲ
Ｃ）が広く使用されるようになっており、かかる鋼繊維
はコンクリートとの付着性を向上させるため、両端部を
曲げたり、特公平１−３２１７８号公報のように異形部
を連続して付けたり、或いは特公昭５５−１６７６８号
公報のように波型に曲げ加工して使用されている。2. Description of the Related Art Concrete used in the field of civil engineering and construction shows high strength against compression, but its tensile strength is about 1/10 of the compressive strength, so it is easy to crack and collapse at once. There is a disadvantage of doing so. Reinforcing bars and steel wires have been used as reinforcements to compensate for these drawbacks,
In recent years, steel fiber reinforced concrete (SFR) in which steel fibers having a diameter of 0.4 to 1.0 mm and a length of 25 to 80 mm are mixed with concrete at a volume ratio of concrete of about 0.3 to 2%.
C) is widely used, and in order to improve the adhesion of the steel fiber to concrete, both ends are bent or deformed portions are continuously attached as disclosed in Japanese Patent Publication No. 1-32178. It is used after being bent into a corrugated shape as disclosed in Japanese Patent Publication No. 55-16768.
【０００３】[0003]
【発明が解決しようとする技術的課題】しかし、鋼繊維
の異形化や曲げはコンクリートとの付着性が向上する反
面、繊維同士が絡み合ういわゆるファイバーボール化現
象を起しやすく、分散性を損なうという問題点がある。
この結果、鋼繊維のコンクリートへの投入時の作業性を
著しく損ねたり、極端な場合は分散機を使用して投入を
行なう必要があった。さらに、コンクリートの混練中、
投入した鋼繊維が再びファイバーボール化してしまい、
十分な補強効果が得られなかったり、混入量を多くでき
ないという問題が発生した。投入前の鋼繊維の絡み合い
を防止する方法として、特公昭６０−９９７６号公報の
ように、水溶性の樹脂を用いて繊維同志をホッチキスの
針の如く張合わせたり、束ねたりする方法が提唱されて
いるが、コストアップとなったり、コンクリート中に溶
けだした樹脂がコンクリートのスランプを変化させた
り、投入前材料の雨漏れ管理を要するなどの問題点があ
った。さらに、高いコンクリート強度を得るために鋼繊
維の混入量を増やすと、コストの大幅な上昇となった
り、コンクリートのワーカビリティ(スランプなど打設
前の取扱い性)を損なう等の問題があり、少ない混入量
で高い補強効果が得られる鋼繊維の出現が望まれてい
た。本発明は、前記したような問題点を解消するために
創案されたもので、その目的とするところは、簡単な構
造で、分散性が良好であるうえコンクリートの亀裂発生
防止効果が高い実用的なコンクリート補強用鋼繊維を提
供することにある。However, while deforming or bending steel fiber improves the adhesion to concrete, it tends to cause a so-called fiber balling phenomenon in which the fibers are entangled with each other, impairing the dispersibility. There is a problem.
As a result, the workability at the time of putting the steel fiber into the concrete has been significantly impaired, and in extreme cases, it has been necessary to use a disperser to carry out the feeding. Furthermore, during concrete kneading,
The injected steel fiber turns into a fiber ball again,
There were problems that a sufficient reinforcing effect could not be obtained and that the amount of mixing could not be increased. As a method of preventing the entanglement of the steel fibers before being introduced, a method of bonding or bundling the fibers together like a stapler needle using a water-soluble resin has been proposed as disclosed in Japanese Patent Publication No. 60-9976. However, there have been problems such as an increase in cost, a change in the slump of the concrete caused by the resin melted into the concrete, and a need to control rain leakage of the material before being charged. In addition, increasing the amount of steel fiber mixed in to obtain high concrete strength results in a significant increase in cost and problems such as impairing concrete workability (e.g., handling before slumping). There has been a demand for the appearance of a steel fiber which can provide a high reinforcing effect with a mixed amount. The present invention has been made in order to solve the above-described problems, and has an object of realizing a simple structure, a good dispersibility, and a high effect of preventing concrete cracking from occurring. It is to provide a concrete reinforcing steel fiber.
【０００４】[0004]
【問題点を解決するための手段】上記目的を達成するた
め本発明は、伸線した鋼線に圧偏加工と曲げ加工を施し
て作られた鋼繊維であって、長手方向と直角の断面が幅
／厚みが２以上の縦長扁平状をなし、全長／幅が２０以
上かつ５０未満の範囲であり、しかも両端又は全長に扁
平面と同一な面内で幅の１／２以上の曲げ高さの曲げ部
を有している構成としたものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a steel fiber made by subjecting a drawn steel wire to pressure biasing and bending, and having a cross section perpendicular to the longitudinal direction. Has a width / thickness of 2 or more in the shape of a vertically long flat plate, and the total length / width is in the range of 20 or more and less than 50, and furthermore, at both ends or the entire length, a bending height of 1/2 or more of the width in the same plane as the flat surface. It has a configuration having a bent portion.
【０００５】[0005]
【実施例】以下本発明の実施例を添付図面に基いて説明
する。図１ないし図４は本発明によるコンクリート補強
用鋼繊維の実施例を示している。１は本発明による鋼繊
維であり、鋼線材を所定径まで伸線加工した後、ダイス
やプレス又は圧延ロール等により圧偏することで作ら
れ、断面積より算出される換算直径が０.４〜１.０mm、
長さが２０〜８０mmで、引張り強さが１００〜１５０kg
f／mm2の範囲にある。鋼繊維１は、図１のように横断面
が縦長偏平状をなしている。(a)は上下を平行直線面１
１，１２とし、左右を平行直線面１３，１４としたもの
であり、(b)は左右を平行直線面１３，１４とし、上下
を平行直線面１３，１４から連続する曲率面１１’１
２’としたものである。(c)は左右を緩曲率面１３'，１
４'とし、上下を急曲率面１１”，１２”としたもので
ある。Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an embodiment of a steel fiber for reinforcing concrete according to the present invention. Reference numeral 1 denotes a steel fiber according to the present invention, which is formed by drawing a steel wire rod to a predetermined diameter, and then pressing the steel wire with a die, a press, a rolling roll, or the like, and having a reduced diameter calculated from the cross-sectional area of 0.4. ~ 1.0mm,
20-80mm in length and 100-150kg in tensile strength
f / mm 2 range. As shown in FIG. 1, the steel fiber 1 has a vertically long flat cross section. (a) is the upper and lower parallel straight surface 1
1, 12 and the left and right are parallel straight surfaces 13 and 14, and (b) is a curvature surface 11'1 which is continuous with the left and right parallel straight surfaces 13 and 14 from the parallel straight surfaces 13 and 14.
2 '. (c) is a curved surface 13 ', 1 on the left and right.
4 ', and the upper and lower surfaces have sharp curvature surfaces 11 "and 12".
【０００６】さらに、本発明は鋼繊維の断面形状を扁平
化させることに加え、幅寸法ｗと厚み寸法ｔと長さ寸法
ｌの関係を一定の条件とする。すなわち、幅寸法ｗ／厚
み寸法ｔ(幅・厚み比)を２以上とし、長さ寸法ｌ／幅寸
法ｗ(幅アスペクト比)を２０以上かつ５０未満とするも
のである。ｗ／ｔが２を下回る比では、ファイバーボー
ルが起りやすくなるため不適当であり、４ないし５とい
うように大きい方が効果的であるが、あまりｗ／ｔが大
きすぎると厚みが薄くなってコンクリート混練中に繊維
が曲がるなどの変形を起してしまうため上限は８程度で
ある。繊維の長さが短くなると、これに伴い補強効果が
下がるため、最低長さを確保するためにｌ／ｗは少なく
とも２０必要である。しかし、ｌ／ｗがあまり大きすぎ
るとｗ／ｔが適正であっても絡み合い性が生ずるため、
上限は５０を越えないことが必要である。Further, in the present invention, in addition to the flattening of the cross-sectional shape of the steel fiber, the relationship between the width dimension w, the thickness dimension t, and the length dimension l is set to a certain condition. That is, the width dimension w / thickness dimension t (width / thickness ratio) is set to 2 or more, and the length dimension 1 / width dimension w (width aspect ratio) is set to 20 or more and less than 50. When the ratio w / t is less than 2, fiber balls are likely to occur, which is inappropriate, and a ratio as large as 4 to 5 is more effective. However, when w / t is too large, the thickness becomes thin. The upper limit is about 8 because deformation such as bending of the fiber occurs during concrete kneading. When the length of the fiber is shortened, the reinforcing effect is reduced, so that at least 20 is required to secure the minimum length. However, if l / w is too large, entanglement occurs even if w / t is appropriate,
The upper limit must not exceed 50.
【０００７】さらに本発明における鋼繊維１は、コンク
リートとの付着性を向上させるための曲げ部１００を有
しているが、その曲げ部１００は、図５のような偏平面
と直角すなわち横曲げではなく、図２ないし図４のよう
に扁平面と同一な面内の曲げすなわち縦曲げとして形成
されている。この理由を説明すると、まずこのように扁
平面と同一な面内の曲げとすることで幅アスペクト比が
実質的に増加し、前記した幅アスペクト比との相乗効果
でコンクリート中での分散性を一層向上させることがで
きることが挙げられる。しかも、重要なことは扁平面と
同一な面内の曲げは補強作用の面でも著効を発揮するか
らである。すなわち、曲げ部を有する鋼繊維のコンクリ
ート補強効果は、コンクリート亀裂発生過程で起こる鋼
繊維の抜け出し抵抗が大きいほど高くなる。つまり、曲
げ部が直線状へ変形する際の抵抗の大きい形状ほど、高
い補強効果を示す。変形抵抗は、繊維の断面二次モーメ
ントに比例することから、上記のように扁平面と同一面
内に曲げられた形状は変形抵抗が極端に大きくなり、高
い補強効果が得られるのである。たとえば、直径０.８m
mφの丸鋼線繊維の断面二次モーメント(公式:πd4/64)
と、同材質で作られた換算直径０．８ｍｍφ(幅ｗ1.6m
m、厚みｔ0.4mm)の偏平状繊維を曲げ高さ１．６ｍｍと
したときの断面二次モーメント（公式wh3/12)を比較す
ると、下記表１のとおりである。Further, the steel fiber 1 according to the present invention has a bent portion 100 for improving the adhesion to concrete. The bent portion 100 is perpendicular to a deviated plane as shown in FIG. Instead, as shown in FIG. 2 to FIG. 4, it is formed as a bend in the same plane as the flat plane, that is, as a vertical bend. The reason for this is as follows. First, the width aspect ratio is substantially increased by bending in the same plane as the flat surface as described above, and the dispersibility in concrete is increased by a synergistic effect with the width aspect ratio described above. It can be further improved. Moreover, it is important that bending in the same plane as the flat surface exerts a remarkable effect also in terms of reinforcing action. In other words, the concrete reinforcing effect of the steel fiber having the bent portion becomes higher as the resistance of the steel fiber coming out during the concrete crack generation process becomes larger. In other words, a shape having a larger resistance when the bent portion is deformed into a straight line exhibits a higher reinforcing effect. Since the deformation resistance is proportional to the second moment of area of the fiber, the shape bent in the same plane as the flat surface as described above has an extremely large deformation resistance, and a high reinforcing effect can be obtained. For example, 0.8m in diameter
round steel wire fiber second moment of mm in diameter (Official: πd 4/64)
And 0.8mmφ converted diameter (width 1.6m) made of the same material
m, when comparing the second moment when the height 1.6mm bent flat fiber thickness t0.4mm) (Official wh 3/12), is shown in Table 1 below.
【０００８】[0008]
【表１】 [Table 1]
【０００９】この表１から扁平面と同一面内曲げ(縦曲
げ)とした場合、偏平面と直角の曲げ(横曲げ)の約１６
倍も変形抵抗の大きいことがわかる。According to Table 1, when bending in the same plane as the flat plane (longitudinal bending), about 16 times of bending (lateral bending) perpendicular to the eccentric plane.
It can be seen that the deformation resistance is twice as large.
【００１０】この扁平面と同一面内曲げの曲げ部１００
は、繊維の長手方向両端、中間に施されてもよいし、全
長にわたり施されてもよく、形状も任意である。図２は
曲げ部１００を両端に直線部１０１，１０１を残すよう
に台形状に形成したものである。図３は中間に直線部１
０１を残すように両端に山状の曲げ部１００，１００を
形成したものである。この場合、２つの山は上下で逆方
向であってもよい。図４は全長にわたり波状に曲げ部１
００を形成したものである。但し、いずれの場合にも曲
げ高さｈは、幅ｗの１／２以上であることが必要であ
る。これは前記したコンクリートとの付着性、分散性だ
けでなく、断面二次モーメントの増大により変形抵抗を
向上し、コンクリートの亀裂発生防止の実効を挙げるた
めに不可欠だからであり、幅ｗの１／２未満では幅・厚
み比と幅アスペクト比が適正であっても所期する効果が
得られない。上記扁平面と同一面内曲げの曲げは、伸線
によって製作した丸線を、ロールにて圧延して偏平化
し、さらに倒れ防止用の溝付きロールによって曲げを行
うか、または丸線に曲げ加工を施した後に圧延ロールで
偏平化することによって得ることができる。[0010] A bent portion 100 having the same in-plane bending as the flat surface
May be applied at both ends and in the middle of the fiber in the longitudinal direction, or may be applied over the entire length, and the shape is arbitrary. In FIG. 2, a bent portion 100 is formed in a trapezoid so as to leave straight portions 101, 101 at both ends. FIG. 3 shows a straight section 1 in the middle.
In this example, mountain-shaped bent portions 100, 100 are formed at both ends so as to leave 01. In this case, the two peaks may be in opposite directions up and down. FIG. 4 shows a wavy bent portion 1 over the entire length.
00 is formed. However, in any case, the bending height h must be equal to or more than の of the width w. This is because not only the adhesion and dispersibility with the concrete described above, but also the deformation resistance is improved by the increase of the second moment of area, and it is indispensable to increase the effectiveness of preventing cracking of the concrete. If it is less than 2, the desired effect cannot be obtained even if the width / thickness ratio and the width aspect ratio are appropriate. For bending in the same plane as the above flat plane, round wire produced by drawing wire is rolled and flattened by rolls, and then bent with grooved rolls to prevent falling, or bent to round wire And then flattening with a rolling roll.
【００１１】次に本発明によるコンクリート補強用鋼繊
維の具体例と特性の試験結果を示す。 ＪＩＳ Ｇ ３５
０５に規格されている軟鋼線材(ＳＷＲＭ６)の５.５ｍ
ｍφを原料とし、１ｍｍφ前後の直径となるように伸線
加工を施した後、平圧加工を行い、更に縦曲げ加工を行
い、所定の長さに切断して４種類の横断面縦長の鋼繊維
を製作した。断面形状は図１(ｂ)、曲げ部形状は図３と
した。また、比較のため伸線加工まま(丸線)の鋼繊維も
作った。その寸法諸元を表２に示す。NO.２ないしNO.６
の各鋼繊維は、断面積が丸線０．８ｍｍφと同一になる
ようにし、また、曲げ高さｈと長さｌをすべて同一寸法
とした。これらの鋼繊維を１.０ton用のコンクリートミ
キサーにて１５分間混練した後、できたファイバーボー
ルの数(１０本以上の鋼繊維が絡み合っている状態をフ
ァイバーボールとして数えた)で分散性の評価試験を行
った結果を表２に示す。Next, concrete examples of the steel fibers for concrete reinforcement according to the present invention and test results of the properties are shown. JIS G 35
5.5m of mild steel wire rod (SWRM6) specified in 05
Using mφ as a raw material, wire drawing is performed to a diameter of about 1 mmφ, then flat pressure processing is performed, then vertical bending processing is performed, and it is cut to a predetermined length to obtain four types of steel having a longitudinal cross section. Fabricated fibers. The cross-sectional shape is shown in FIG. 1B, and the bent portion shape is shown in FIG. For comparison, a steel fiber as drawn (round wire) was also made. The dimensions are shown in Table 2. NO.2 to NO.6
Each of the steel fibers had the same cross-sectional area as the round wire 0.8 mmφ, and the bending height h and the length l were all the same dimensions. These steel fibers were kneaded with a 1.0 ton concrete mixer for 15 minutes, and then evaluated for dispersibility by the number of fiber balls formed (the state in which ten or more steel fibers were entangled was counted as fiber balls). Table 2 shows the results of the test.
【００１２】[0012]
【表２】 [Table 2]
【００１３】この表２から明らかなように、幅・厚み比
が２以上で、かつ幅アスペクト比が５０未満であるNO.
５とNO.６はファイバーボールが発生せず、分散性が良
好であることがわかる。As is apparent from Table 2, NO. 2 having a width / thickness ratio of 2 or more and a width aspect ratio of less than 50 was used.
No. 5 and No. 6 did not generate fiber balls, indicating that the dispersibility was good.
【００１４】次に、前記と同じ素材と製法で曲げ高さを
種々にした鋼繊維を製作した。それらをNO.７〜NO.１０
として表３に示す。なお、NO.１０は曲げを平圧面に対
し直角な面で行ったものすなわち、図５に示す横曲げタ
イプである。補強効果を検討するため、各鋼繊維を生コ
ンクリートに容積比で０.４％混入し、１.０ton用のミ
キサーにて十分混練して均一分散させた後、１５０×１
５０×５３０mmの繊維強化コンクリート試験片を製作し
た。鋼繊維の混入量が少ないため、いずれの鋼繊維にお
いてもファイバーボールの生成はなかった。前記コンク
リート試験片を水中で２８日間の養生を行った後、曲げ
試験を行って、曲げ強度と、曲げ荷重〜たわみ曲線で囲
まれる面積で示されるいわゆる曲げタフネスを求めた。
その結果を表３に示す。Next, steel fibers having various bending heights were manufactured using the same material and manufacturing method as described above. No. 7 to No. 10
As shown in Table 3. No. 10 is a lateral bending type shown in FIG. 5, in which bending is performed on a plane perpendicular to the flat pressure surface. In order to examine the reinforcing effect, each steel fiber was mixed with ready-mixed concrete at a volume ratio of 0.4%, kneaded well with a 1.0-ton mixer, and uniformly dispersed.
A fiber reinforced concrete test piece of 50 × 530 mm was manufactured. Fiber balls were not generated in any of the steel fibers because the amount of steel fibers mixed was small. After the concrete test piece was cured in water for 28 days, a bending test was performed to determine a bending strength and a so-called bending toughness represented by an area surrounded by a bending load to a bending curve.
Table 3 shows the results.
【００１５】[0015]
【表３】 [Table 3]
【００１６】この表３から明らかなように、NO.６〜NO.
９を比べると、曲げ高さが幅の１／２以下であるNO.８
とNO.９は、本発明の実施例であるNO.６，NO７にくらべ
て補強効果が低くなっている。特に、曲げタフネスが低
い値となっている。曲げ高さが２.０ｍｍと同一であるN
O.１，３，６を比べると、補強効果はNO.６，３，１の
順番で低下しており、断面２次モーメントの大きさの順
番と一致している。ｗ／ｔを大きい値とすることによ
り、高い補強効果が得られ、ｗ／ｔ値としては、分散性
とを勘案して２以上が適当であることがわかる。NO.６
とNO.１０を比べるとやはりNO.６の補強効果が優れてお
り、曲げ加工は平圧加工と同一な面である縦曲げを施し
たものが高い補強効果を示すことがわかる。As is apparent from Table 3, NO. 6 to NO.
Compared to No. 9, the bending height is no more than 1/2 of the width.
No. 9 and No. 9 have a lower reinforcing effect than Nos. 6 and 7 of the embodiment of the present invention. In particular, the bending toughness has a low value. N whose bending height is the same as 2.0 mm
Comparing O.1,3,6, the reinforcing effect decreases in the order of NO.6,3,1 and coincides with the order of the magnitude of the second moment of area. By setting w / t to a large value, a high reinforcing effect is obtained, and it is understood that w / t value of 2 or more is appropriate in consideration of dispersibility. NO.6
Comparing No. 10 with No. 10, the reinforcing effect of No. 6 is also excellent, and it can be seen that the one subjected to the vertical bending, which is the same surface as the flat pressing, shows a high reinforcing effect.
【００１７】[0017]
【発明の効果】以上説明した本発明によれば、伸線した
鋼線に圧偏加工と曲げ加工を施した鋼繊維であるため、
極めて高い引っ張り強さをそなえており、こうした鋼線
型の繊維の長手方向と直角の断面を幅／厚みが２以上の
縦長扁平状とし、全長／幅を２０以上かつ５０未満の範
囲とし、しかも両端又は全長に扁平面と同一な面内で幅
の１／２以上の曲げ高さの曲げ部１００を形成している
ため、断面二次モーメントが大きく、変形抵抗を極めて
大きなものとすることができ、これによりコンクリート
の亀裂発生防止効果を向上することができ、また、前記
曲げ部１００により幅アスペクト比が実質的に大きくな
るため、コンクリートに投入したときにサラサラと分離
し、分散性が良好で、混練時の絡み合いも生じにくくな
り、構造も簡単で容易に大量生産することができるなど
のすぐれた効果が得られる。According to the present invention described above, since the steel fiber is obtained by subjecting the drawn steel wire to pressure biasing and bending,
It has an extremely high tensile strength, and the cross section perpendicular to the longitudinal direction of such a steel wire type fiber has a longitudinally flat shape with a width / thickness of 2 or more, and a total length / width of 20 or more and less than 50. Alternatively, since the bent portion 100 having a bending height of 以上 or more of the width is formed in the same plane as the flat surface in the entire length, the second moment of area is large, and the deformation resistance can be extremely large. Thereby, the effect of preventing cracking of concrete can be improved, and since the width aspect ratio is substantially increased due to the bent portion 100, when the concrete is put into the concrete, it is separated from the surface, and the dispersibility is good. In addition, excellent effects are obtained such that entanglement during kneading hardly occurs, the structure is simple, and mass production is easy.
【図１】本発明によるコンクリート補強用鋼繊維の横断
面図である。FIG. 1 is a cross-sectional view of a steel fiber for concrete reinforcement according to the present invention.
【図２】本発明による補強繊維の一例を示す拡大斜視図
である。FIG. 2 is an enlarged perspective view showing an example of a reinforcing fiber according to the present invention.
【図３】本発明による補強繊維の他例を示す拡大斜視図
である。FIG. 3 is an enlarged perspective view showing another example of the reinforcing fiber according to the present invention.
【図４】本発明による補強繊維の他例を示す拡大斜視図
である。FIG. 4 is an enlarged perspective view showing another example of the reinforcing fiber according to the present invention.
【図５】比較品の斜視図である。FIG. 5 is a perspective view of a comparative product.
１ 鋼繊維 １００ 曲げ部 ｗ 幅 ｔ 厚み ｈ 曲げ高さ 1 steel fiber 100 bending part w width t thickness h bending height
Claims (1)
て作られた鋼繊維であって、長手方向と直角の断面が幅
／厚みが２以上の縦長扁平状をなし、全長／幅が２０以
上かつ５０未満の範囲であり、しかも両端又は全長に扁
平面と同一な面内で幅の１／２以上の曲げ高さの曲げ部
１００を有していることを特徴とするコンクリート補強
用鋼繊維。1. A steel fiber formed by subjecting a drawn steel wire to pressure biasing and bending, wherein a cross section perpendicular to the longitudinal direction has a width / thickness of 2 or more in a vertically long flat shape, and has a total length. / The width is in the range of 20 or more and less than 50, and the bending portion 100 having a bending height of １ ／ or more of the width at both ends or the entire length in the same plane as the flat surface is provided. Steel fiber for concrete reinforcement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5103759A JP2627046B2 (en) | 1993-04-07 | 1993-04-07 | Steel fiber for concrete reinforcement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5103759A JP2627046B2 (en) | 1993-04-07 | 1993-04-07 | Steel fiber for concrete reinforcement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06294017A JPH06294017A (en) | 1994-10-21 |
| JP2627046B2 true JP2627046B2 (en) | 1997-07-02 |
Family
ID=14362455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5103759A Expired - Fee Related JP2627046B2 (en) | 1993-04-07 | 1993-04-07 | Steel fiber for concrete reinforcement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2627046B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1009638A3 (en) * | 1995-09-19 | 1997-06-03 | Bekaert Sa Nv | STEEL WIRE ELEMENT FOR MIXING IN POST-CURING MATERIALS. |
| KR20120037912A (en) * | 2009-06-12 | 2012-04-20 | 엔브이 베카에르트 에스에이 | High elongation fibres |
| KR20120031942A (en) * | 2009-06-12 | 2012-04-04 | 엔브이 베카에르트 에스에이 | High elongation fibre with good anchorage |
| EP2652220B1 (en) | 2010-12-15 | 2016-06-08 | NV Bekaert SA | Steel fibre for reinforcing concrete or mortar provided with flattened sections |
| BE1021498B1 (en) | 2010-12-15 | 2015-12-03 | Nv Bekaert Sa | STEEL FIBER FOR ARMING CONCRETE OR MORTAR, WITH AN ANCHORING END WITH AT LEAST THREE STRAIGHT SECTIONS |
| BE1021496B1 (en) | 2010-12-15 | 2015-12-03 | Nv Bekaert Sa | STEEL FIBER FOR ARMING CONCRETE OR MORTAR, WITH AN ANCHORING END WITH AT LEAST TWO CURVED SECTIONS |
| CN103224337A (en) * | 2013-04-16 | 2013-07-31 | 刘纯郴 | Flat-rolled drum shaped cross section spiral steel fiber |
| KR101596246B1 (en) * | 2014-09-24 | 2016-02-22 | (주)코스틸 | Arched steel fiber for cement reinforcement material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS531369A (en) * | 1976-06-28 | 1978-01-09 | Hitachi Ltd | Device for removing magnetic foreign material in cooling water |
| JPH0218303A (en) * | 1988-07-07 | 1990-01-22 | Mitsubishi Gas Chem Co Inc | Reactor and process for reforming hydrocarbon |
-
1993
- 1993-04-07 JP JP5103759A patent/JP2627046B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06294017A (en) | 1994-10-21 |
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