EP0392039A1 - Steel strip for concrete reinforcement - Google Patents

Steel strip for concrete reinforcement Download PDF

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Publication number
EP0392039A1
EP0392039A1 EP89106394A EP89106394A EP0392039A1 EP 0392039 A1 EP0392039 A1 EP 0392039A1 EP 89106394 A EP89106394 A EP 89106394A EP 89106394 A EP89106394 A EP 89106394A EP 0392039 A1 EP0392039 A1 EP 0392039A1
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EP
European Patent Office
Prior art keywords
sheet
fiber
steel
width
length
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Granted
Application number
EP89106394A
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German (de)
French (fr)
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EP0392039B1 (en
Inventor
Eckhard Dipl.-Ing. Goldau
Ulrich Dipl.-Ing. Wolf
Hans-Georg Dipl.-Ing. Longerich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FATEK BETONFASERTECHNIK GMBH
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TECTA GmbH
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Publication date
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Priority to EP89106394A priority Critical patent/EP0392039B1/en
Priority to AT89106394T priority patent/ATE83406T1/en
Priority to DE8989106394T priority patent/DE58903045D1/en
Publication of EP0392039A1 publication Critical patent/EP0392039A1/en
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Publication of EP0392039B1 publication Critical patent/EP0392039B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/06—Making more than one part out of the same blank; Scrapless working

Definitions

  • the invention relates to a steel fiber in the form of a sheet metal strip as a reinforcing element for concrete and to a method for its production.
  • steel fibers are used as reinforcement elements.
  • a concrete reinforced with steel fibers is improved in its properties, for example tensile strength, breaking strength, shear strength, stretchability, toughness, dynamic strength, fatigue strength. It is therefore used on a large scale.
  • the steel fiber should have the following properties: It should be hard and strong. It should not break when mixed with concrete or aggregates. It should not be too short or too thick, otherwise it is insufficient in its strengthening. It should not be too long or too thin, otherwise it tends to form spherical lumps of cement.
  • a steel fiber cross section of 0.1 to 1.0 mm2 In general, a steel fiber cross section of 0.1 to 1.0 mm2, a steel fiber length of 20 to 50 mm and a weight fraction of the steel fibers of 15 to 150 kg / m3 of concrete are recommended. In addition to their properties, the cost-effective production of steel fibers is a top priority.
  • the steel fiber is a round fiber which is cut off by a corrugated wire (EP 0 130 191 B1; GB 1 446 855 A1).
  • the steel fiber is a steel chip that is milled off from a steel block (DE 2 723 382 C3; DE 2 904 228 C2).
  • the steel fiber is in the form of a sheet metal strip which is sheared off from a sheet (DE 2 359 368 A1; DE 2 359 367 B2; DE 2 824 777 C3).
  • the steel fibers belonging to the third group have excellent properties.
  • the process for their production has hitherto been associated with the lack of high production costs: the width of the steel sheet produced in the desired fiber thickness is split to the desired fiber length, after which the fibers are sheared off in the desired width.
  • the invention seeks to remedy this.
  • the invention is based, to create steel fibers with further improved properties in a cost-effective manufacturing process from a sheet as a starting material.
  • the object is achieved by the measures described in the patent claims.
  • the sheet metal strips are first brought to a width which is equal to the length of the steel fiber.
  • the sheet width is theoretically arbitrary; in practice, it depends on the width of the sheets on the market, the dimensions of the punch press insert and the dimensions of the tool. While the fiber length is also fixed in the known methods with the sheet metal strip width, this is variable in the invention: by exchanging the tool inserts, fibers of different dimensions, including lengths, can be produced for a given sheet metal strip width.
  • the sheet is processed without scrap. The punching of the steel fibers and the introduction of the bead-like depressions takes place in the same operation.
  • the beads can be designed variably.
  • the tool punches in a - for example in 4 - process or work steps. Then in the 1st step every 1st, 4th, 7th etc. row, in the 2nd step every 2nd, 5th, 8th etc. row, in the 3rd step every 3rd, 6th, 9th etc. Punched rows, in the 4th step the strips are punched between the rows. When adjusting the sheet width to the steel fiber length, the entire sheet is processed. All work steps are carried out simultaneously in the same follow-up tool; the tool engages in different places on the sheet metal to carry out one of a working steps. According to (a-1) - in the exemplary embodiment 3 - start-up strokes, all steel fibers are punched in the following tool in each working cycle.
  • the steel fiber itself has a high degree of inherent stability due to the beads / profiles on the edge.
  • the edge formation also leads to better interlocking with the concrete. Due to the lack of waves, there can be no stretching of the steel fiber under load.
  • the steel fiber selected as an exemplary embodiment consists of a sheet metal strip 1. It has a selectable fiber length 1 and a selectable fiber width b. In the exemplary embodiment, the fiber length is approximately 36 mm, the fiber width is approximately 2 mm. Its thickness is approximately 0.4 mm. These dimensions can be changed within limits.
  • the metal strip 1 is provided on its longitudinal edges 2, 3 with bead-like depressions 4.
  • the bead-like depressions 4 are longitudinal on one longitudinal edge 2 compared to those on the other longitudinal edge 3 staggered direction:
  • a bead-like depression on the other longitudinal edge 3 is provided symmetrically between two bead-like depressions 4 on one longitudinal edge 2.
  • the bead-like depressions 4 create meandering lines in the view and in the rear view. Another configuration is possible by changing the arrangement and design of the bead-like depressions 4.
  • the output for the process for producing the steel fiber with the fiber length 1 and the fiber width b is a sheet with the sheet length L and the sheet width B.
  • the sheet length L is arbitrary.
  • a m and n are integers; a is greater than or equal to 2.
  • Steel fibers of fiber length 1 are arranged along the sheet width B with the interposition of a strip of fiber width bm in the axial direction, and n steel fibers of fiber width b are arranged next to one another in the transverse direction over the sheet metal part length L1.
  • 3 steel fibers with a fiber length of 1 36 mm are arranged over the sheet width B shown.
  • a 3; there are therefore three procedural steps.
  • Sections I, II and III are of equal length; they are in the same follow-up tool at the same time.
  • the 1st, 3rd, 5th, 13th, 15th and 17th rows are punched from the full sheet metal - section I in FIG. 4, that is to say the first and each row after the next.
  • the sheet has the shape shown in FIG. 4 in section II.
  • the remaining rows namely the 2nd, 4th, 6th, ... 14th, 16th and 18th rows are then punched.
  • the sheet has the shape shown in FIG. 1 in section III.
  • the 4 strips - which are used for reasons of the exact manufacture of the steel fibers - are punched at the edge and between the individual steel fibers, which also have the dimensions of a steel fiber.
  • more than three fiber rows can be distributed over the sheet width B and integer multiples of 18 over the partial length L1.
  • the bead-like depressions 4 are simultaneously introduced into the sheet metal strip 1.
  • the steel fibers are used as reinforcement elements for concrete, screed and mortar.
  • the process is used to manufacture these steel fibers.

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  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
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Abstract

The steel fibre has the form of a sheet-metal strip (1). It is provided as a reinforcing element for concrete. The sheet-metal strip (1) is provided on both longitudinal edges (2;3) with bead-like recesses (4), the bead-like recesses (4) on one longitudinal edge (2) being arranged offset in the longitudinal direction relative to those on the other longitudinal edge (3). <IMAGE>

Description

Technisches Gebiet:Technical field:

Die Erfindung bezieht sich auf eine Stahlfaser in der Form eines Blechstreifens als Bewehrungselement für Beton und auf ein Verfahren zu seiner Herstellung.The invention relates to a steel fiber in the form of a sheet metal strip as a reinforcing element for concrete and to a method for its production.

Stand der Technik:State of the art:

Für Beton, worunter im folgenden auch Estrich und Mörtel verstanden werden, werden u.a. Stahlfasern als Bewehrungselemente verwendet. Ein mit Stahl­fasern bewehrter Beton ist in seinen Eigenschaften, zum Beispiel Zugfestigkeit, Bruchfestigkeit, Scher­festigkeit, Streckvermögen, Zähigkeit, dynamische Festigkeit, Ermüdungsfestigkeit, verbessert. Man verwendet ihn deshalb in großem Umfang. Die Stahl­faser soll dabei folgende Eigenschaften aufweisen: Sie soll hart und fest sein. Beim Vermischen mit Beton oder Zuschlagstoffen soll sie nicht brechen. Sie soll nicht zu kurz oder zu dick sein, da sie sonst unzureichend in ihrem Verstärkungsvermögen ist. Sie soll nicht zu lang oder zu dünn sein, da sie sonst zur Bildung von kugeligen Zementklumpen neigt. Allgemein werden ein Stahlfaser-Querschnitt von 0,1 bis 1,0 mm², eine Stahlfaser-Länge von 20 bis 50 mm und ein Gewichtsanteil der Stahlfasern von 15 bis 150 kg/m³ Beton empfohlen. Neben ihren Eigenschaften ist die kostengünstige Herstellung der Stahlfasern oberste Bedingung.For concrete, which in the following also means screed and mortar, steel fibers are used as reinforcement elements. A concrete reinforced with steel fibers is improved in its properties, for example tensile strength, breaking strength, shear strength, stretchability, toughness, dynamic strength, fatigue strength. It is therefore used on a large scale. The steel fiber should have the following properties: It should be hard and strong. It should not break when mixed with concrete or aggregates. It should not be too short or too thick, otherwise it is insufficient in its strengthening. It should not be too long or too thin, otherwise it tends to form spherical lumps of cement. In general, a steel fiber cross section of 0.1 to 1.0 mm², a steel fiber length of 20 to 50 mm and a weight fraction of the steel fibers of 15 to 150 kg / m³ of concrete are recommended. In addition to their properties, the cost-effective production of steel fibers is a top priority.

Nach ihrer äußeren Gestalt, dem Ausgangsmaterial und dem Verfahren zu ihrer Herstellung werden im wesent­lichen drei Gruppen von Stahlfasern unterschieden. Bei der ersten Gruppe liegt die Stahlfaser als Rundfaser vor, die von einem gewellten Draht abge­schnitten wird (EP 0 130 191 B1; GB 1 446 855 A1). Bei der zweiten Gruppe liegt die Stahlfaser als Stahlspan vor, der von einem Stahlblock abgefräst wird (DE 2 723 382 C3; DE 2 904 228 C2). Bei der dritten Gruppe liegt die Stahlfaser als Blechstreifen vor, der von einem Blech abgeschert wird (DE 2 359 368 A1; DE 2 359 367 B2; DE 2 824 777 C3).Basically, three groups of steel fibers are distinguished according to their external shape, the starting material and the process for their production. In the first group, the steel fiber is a round fiber which is cut off by a corrugated wire (EP 0 130 191 B1; GB 1 446 855 A1). In the second group, the steel fiber is a steel chip that is milled off from a steel block (DE 2 723 382 C3; DE 2 904 228 C2). In the third group, the steel fiber is in the form of a sheet metal strip which is sheared off from a sheet (DE 2 359 368 A1; DE 2 359 367 B2; DE 2 824 777 C3).

Es ist bekannt, daß die der dritten Gruppe zugeordneten Stahlfasern hervorragende Eigenschaften aufweisen. Dem Verfahren zu ihrer Herstellung haftet jedoch bisher der Mangel hoher Produktionskosten an: Das in der gewünschten Faserstärke hergestellte Stahlblech wird in seiner Breite auf die gewünschte Faserlänge gespalten, wonach die Fasern in der gewünschten Breite abgeschert werden.It is known that the steel fibers belonging to the third group have excellent properties. However, the process for their production has hitherto been associated with the lack of high production costs: the width of the steel sheet produced in the desired fiber thickness is split to the desired fiber length, after which the fibers are sheared off in the desired width.

Darstellung der Erfindung:Presentation of the invention:

Hier will die Erfindung Abhilfe schaffen. Der Erfindung liegt die Aufgabe zugrunde, aus einem Blech als Ausgangs­material Stahlfasern mit weiter verbesserten Eigen­schaften in einem kostengünstigen Herstellungsverfahren zu schaffen. Die Aufgabe wird gelöst durch die in den Patentansprüchen beschriebenen Maßnahmen.The invention seeks to remedy this. The invention is based, to create steel fibers with further improved properties in a cost-effective manufacturing process from a sheet as a starting material. The object is achieved by the measures described in the patent claims.

Bei der Erfindung ist der den Verfahren zur Herstellung von Stahlfasern aus Blech anhaftende Nachteil beseitigt daß die Blechstreifen zunächst auf eine Breite gebracht werden, die gleich der Länge der Stahlfaser ist. Bei der Erfindung ist die Blechbreite theoretisch beliebig; in der Praxis hängt sie einmal von der Breite der auf dem Markt befindlichen Bleche, zum anderen davon ab welche Abmessungen der Einschub der Stanzpresse hat und in welchen Abmessungen das Werkzeug wirtschaft­lich herzustellen ist. Während bei den bekannten Verfahren mit der Blechstreifenbreite auch die Faserlänge fest­gelegt ist, ist diese bei der Erfindung variabel: Durch Austausch der Werkzeugeinsätze können bei einer vor­gegebenen Blechstreifenbreite Fasern unterschiedlicher Abmessungen, auch Längen, hergestellt werden. Das Blech wird schrottfrei verarbeitet. Das Stanzen der Stahlfasern und das Einbringen der sickenartigen Vertiefungen er­folgt in demselben Arbeitsgang. Dabei können die Sicken variabel gestaltet werden.In the invention, the disadvantage inherent in the process for the production of steel fibers from sheet metal is eliminated that the sheet metal strips are first brought to a width which is equal to the length of the steel fiber. In the invention, the sheet width is theoretically arbitrary; in practice, it depends on the width of the sheets on the market, the dimensions of the punch press insert and the dimensions of the tool. While the fiber length is also fixed in the known methods with the sheet metal strip width, this is variable in the invention: by exchanging the tool inserts, fibers of different dimensions, including lengths, can be produced for a given sheet metal strip width. The sheet is processed without scrap. The punching of the steel fibers and the introduction of the bead-like depressions takes place in the same operation. The beads can be designed variably.

Das Werkzeug stanzt in a - zum Beispiel in 4 - Verfahrens- oder Arbeitsschritten. Dann wird beim 1. Arbeitsschritt jede 1., 4., 7 usw. Reihe, beim 2. Arbeitsschritt jede 2., 5., 8. usw. Reihe, beim 3. Arbeitsschritt jede 3., 6., 9. usw. Reihe gestanzt, beim 4. Arbeitsschritt werden die Streifen zwischen den Reihen gestanzt. Bei Anpassung der Blechbreite an die Stahlfaserlänge wird das gesamte Blech verarbeitet. Alle Arbeitsschritte werden in demselben Folgewerkzeug gleichzeitig ausgeführt; das Werkzeug greift an unterschiedlichen Stellen des Blechs zur Ausführung jeweils eines von a Arbeitsschritten an. Nach (a-1) - im Ausführungsbeispiel 3 - Anfahrhüben werden in dem Folgewerkzeug bei jedem Arbeitstakt alle Stahlfasern gestanzt.The tool punches in a - for example in 4 - process or work steps. Then in the 1st step every 1st, 4th, 7th etc. row, in the 2nd step every 2nd, 5th, 8th etc. row, in the 3rd step every 3rd, 6th, 9th etc. Punched rows, in the 4th step the strips are punched between the rows. When adjusting the sheet width to the steel fiber length, the entire sheet is processed. All work steps are carried out simultaneously in the same follow-up tool; the tool engages in different places on the sheet metal to carry out one of a working steps. According to (a-1) - in the exemplary embodiment 3 - start-up strokes, all steel fibers are punched in the following tool in each working cycle.

Die Stahlfaser selbst weist durch die Sicken/Profile am Rand eine hohe Eigenstabilität auf.Die Randaus­bildung führt auch zu einer besseren Verzahnung mit dem Beton. Durch das Fehlen von Wellen kann es auch nicht Streckungen der Stahlfaser bei Belastung geben.The steel fiber itself has a high degree of inherent stability due to the beads / profiles on the edge. The edge formation also leads to better interlocking with the concrete. Due to the lack of waves, there can be no stretching of the steel fiber under load.

Kurze Beschreibung der Zeichnung:Brief description of the drawing:

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend im einzelnen beschrieben. Es zeigen:

  • Figur 1 in vergrößerter Darstellung die Aufsicht einer Stahlfaser;
  • Figur 2 eine Seitenansicht der Stahlfaser gegen die schmale Seite;
  • Figur 3 die Unteransicht der Stahlfaser;
  • Figur 4 ein Blech mit den Verfahrensschritten zum Stanzen der Stahlfasern.
An embodiment of the invention is shown in the drawing and will be described in detail below. Show it:
  • Figure 1 is an enlarged view of the supervision of a steel fiber;
  • Figure 2 is a side view of the steel fiber against the narrow side;
  • Figure 3 shows the bottom view of the steel fiber;
  • Figure 4 is a sheet with the process steps for punching the steel fibers.

Bester Weg zur Ausführung der Erfindung:Best way to carry out the invention:

Die als Ausführungsbeispiel gewählte Stahlfaser be­steht aus einem Blechstreifen 1. Sie weist eine wähl­bare Faserlänge 1 und eine wählbare Faserbreite b auf. Im Ausführungsbeispiel beträgt die Faserlänge ca. 36 mm, die Faserbreite ca. 2 mm. Ihre Dicke beträgt ca. 0,4 mm. In Grenzen sind diese Abmessungen ver­änderbar.The steel fiber selected as an exemplary embodiment consists of a sheet metal strip 1. It has a selectable fiber length 1 and a selectable fiber width b. In the exemplary embodiment, the fiber length is approximately 36 mm, the fiber width is approximately 2 mm. Its thickness is approximately 0.4 mm. These dimensions can be changed within limits.

Der Blechstreifen 1 ist an seinen Längsrändern 2, 3 mit sickenartigen Vertiefungen 4 versehen. Die sicken­artigen Vertiefungen 4 sind an dem einen Längsrand 2 gegenüber denen an dem anderen Längsrand 3 in Längs­ richtung versetzt angeordnet: Symmetrisch ist zwischen jeweils zwei sickenartigen Vertiefungen 4 an dem einen Längsrand 2 eine sickenartige Vertiefung an dem anderen Längsrand 3 vorgesehen.The metal strip 1 is provided on its longitudinal edges 2, 3 with bead-like depressions 4. The bead-like depressions 4 are longitudinal on one longitudinal edge 2 compared to those on the other longitudinal edge 3 staggered direction: A bead-like depression on the other longitudinal edge 3 is provided symmetrically between two bead-like depressions 4 on one longitudinal edge 2.

Durch die sickenartigen Vertiefungen 4 entstehen in der Ansicht und in der Rückansicht mäanderförmige Linien. Durch Änderung von Anordnung und Ausbildung der sickenartigen Vertiefungen 4 ist eine andere Ausgestaltung möglich.The bead-like depressions 4 create meandering lines in the view and in the rear view. Another configuration is possible by changing the arrangement and design of the bead-like depressions 4.

Ausgang für das Verfahren zur Herstellung der Stahl­faser mit der Faserlänge 1 und der Faserbreite b ist ein Blech mit der Blechlänge L und der Blechbreite B. Die Blechlänge L ist beliebig. Die Blechbreite B ist zur Erzielung eines schrottfreien Stanzvorgangs an die Abmessungen der zu stanzenden Blechstreifen 1 angepaßt. Sie hängt außerdem von den Abmessungen des Einschubs der Stanzpresse und des Werkzeugs ab. Über die Blechbreite B > m · 1 oder B > n · b und über eine Länge L1 = n · b < L oder L1 = m · 1 < L werden bei jedem von (a-1) Verfahrensschritten

Figure imgb0001
Fasern aus dem Blech 10 gestanzt. Dabei sind a, m und n ganze Zahlen; a ist größer oder gleich 2.The output for the process for producing the steel fiber with the fiber length 1 and the fiber width b is a sheet with the sheet length L and the sheet width B. The sheet length L is arbitrary. The sheet width B is adapted to achieve a scrap-free punching process to the dimensions of the sheet metal strip 1 to be punched. It also depends on the dimensions of the insertion of the punch press and the tool. Process steps are carried out for each of (a-1) over the sheet width B> m · 1 or B> n · b and over a length L1 = n · b <L or L1 = m · 1 <L
Figure imgb0001
 Fibers punched out of sheet 10. Here a, m and n are integers; a is greater than or equal to 2.

Über die Blechbreite B sind unter Zwischenfügung je eines Streifens von der Faserbreite b m Stahlfasern der Faserlänge 1 in Axialrichtung, über die Blech-­Teillänge L1 n Stahlfasern der Faserbreite b in Quer­richtung nebeneinander angeordnet. Im Ausführungs­beispiel sind über die dargestellte Blechbreite B 3 Stahlfasern mit der Faserlänge 1 = 36 mm angeordnet. Über die Blech-Teillänge L1, die im Ausführungsbeispiel gleich der Faserlänge 1 gewählt ist, sind n = 18 Stahlfasern der Faserbreite b = 2 mm in Querrichtung nebeneinander angeordnet.Steel fibers of fiber length 1 are arranged along the sheet width B with the interposition of a strip of fiber width bm in the axial direction, and n steel fibers of fiber width b are arranged next to one another in the transverse direction over the sheet metal part length L1. In the exemplary embodiment, 3 steel fibers with a fiber length of 1 = 36 mm are arranged over the sheet width B shown. N = 18 steel fibers with a fiber width of b = 2 mm are arranged next to one another in the transverse direction over the sheet metal part length L1, which in the exemplary embodiment is equal to fiber length 1.

Es ist möglich, die Lage der Stahlfasern um 90o zu drehen, also die Stahlfasern in Längsrichtung des Blechs auszurichten.It is possible to turn the position of the steel fibers by 90 o , i.e. to align the steel fibers in the longitudinal direction of the sheet.

Bei a Verfahrensschritten zur Herstellung der Stahl­fasern über die Teillänge des Blechs L1 = n · b werden beim 1. Verfahrensschritt alle (x·(a-1)+1)- ten Reihen, beim 2. Verfahrensschritt alle (x·(a-1)+2)- ten Reihen, beim (a - 1)- ten Verfahrensschritt die letzten Reihen und beim (a)- ten Verfahrensschritt die Streifen am Rand und zwischen den einzelnen Blechstreifen/Stahl­fasern gestanzt, wobei x eine ganzzahlige Variable zwischen Null und

Figure imgb0002
ist.In a process steps for the production of the steel fibers over the partial length of the sheet L1 = n · b, in the first process step all (x · (a-1) +1) th rows, in the second process step all (x · (a-1 ) +2) th rows, in the (a - 1) th process step the last rows and in the (a) th process step the strips are stamped on the edge and between the individual sheet metal strips / steel fibers, where x is an integer variable between zero and
Figure imgb0002
 is.

Im Ausführungsbeispiel ist a = 3; es sind also drei Verfahrensschritte vorgesehen. Die Zahl der über die Blechbreite B verteilten Faserreihen ist m = 3, die Zahl der über die Teillänge L1 verteilten Fasern ist n = 18. Die Abschnitte I, II und III sind gleich lang; sie sind gleichzeitig in demselben Folgewerkzeug. Beim ersten Verfahrensschritt werden aus dem vollen Blech - Abschnitt I in Figur 4 - die 1., 3., 5.,.. 13., 15. und 17. Reihe gestanzt, also die erste und jede über­nächste Reihe. Nach diesem ersten Verfahrensschritt hat das Blech die in Figur 4 im Abschnitt II dargestellte Form. Im zweiten Verfahrensschritt werden dann die ver­bliebenen Reihen, nämlich die 2., 4., 6.,..14., 16., und 18. Reihe gestanzt. Nach diesem Verfahrensschritt hat das Blech die in Figur 1 im Abschnitt III dar­gestellte Form. Im dritten Verfahrensschritt werden dann die - aus Gründen der exakten Herstellung der Stahlfasern verwendeten - 4 Streifen am Rand und zwischen den einzelnen Stahlfasern stehengebliebenen Streifen, die ebenfalls die Abmessungen jeweils einer Stahlfaser haben, gestanzt. Abhängig von der Größe des Folgewerkzeugs können mehr als drei Faserreihen über die Blechbreite B und ganzzahlige Vielfache von 18 über die Teillänge L1 verteilt sein.In the exemplary embodiment, a = 3; there are therefore three procedural steps. The number of fiber rows distributed over the sheet width B is m = 3, the number of fibers distributed over the partial length L1 is n = 18. Sections I, II and III are of equal length; they are in the same follow-up tool at the same time. In the first process step, the 1st, 3rd, 5th, 13th, 15th and 17th rows are punched from the full sheet metal - section I in FIG. 4, that is to say the first and each row after the next. After this first process step, the sheet has the shape shown in FIG. 4 in section II. In the second process step, the remaining rows, namely the 2nd, 4th, 6th, ... 14th, 16th and 18th rows are then punched. After this process step, the sheet has the shape shown in FIG. 1 in section III. In the third process step, the 4 strips - which are used for reasons of the exact manufacture of the steel fibers - are punched at the edge and between the individual steel fibers, which also have the dimensions of a steel fiber. Depending on the size of the follow-up tool, more than three fiber rows can be distributed over the sheet width B and integer multiples of 18 over the partial length L1.

Während des Stanzvorgangs werden gleichzeitig die sickenartigen Vertiefungen 4 in den Blechstreifen 1 eingebracht.During the punching process, the bead-like depressions 4 are simultaneously introduced into the sheet metal strip 1.

Gewerbliche Verwertbarkeit:Commercial usability:

Die Stahlfasern werden als Bewehrungselemente für Beton, Estrich und Mörtel verwendet. Das Verfahren dient der Herstellung dieser Stahlfasern.The steel fibers are used as reinforcement elements for concrete, screed and mortar. The process is used to manufacture these steel fibers.

Claims (7)

1. Verfahren zur Herstellung einer Stahlfaser als Bewehrungselement für Beton aus einem Blech, dadurch gekennzeichnet, daß bei einer wählbaren Faserlänge 1 und einer wählbaren Faserbreite b aus dem Blech der Blechlänge L und der Blech­breite B über die Blechbreite B > m · 1 und über eine Teillänge L1 = n · b < L oder B > n · b und L1 = m · 1 < L bei jedem von (a - 1) Verfahrens­schritten
Figure imgb0003
 Fasern aus dem Blech gestanzt werden, wobei a, m und n ganze Zahlen sind und a ≧ 2 ist.1. A method for producing a steel fiber as a reinforcement element for concrete from a sheet, characterized in that with a selectable fiber length 1 and a selectable fiber width b from the sheet metal of the sheet length L and the sheet width B over the sheet width B> m · 1 and over a Part length L1 = n · b <L or B> n · b and L1 = m · 1 <L in each of (a - 1) process steps
Figure imgb0003
 Fibers are punched out of the sheet, where a, m and n are integers and a ≧ 2. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß über die Blechbreite B unter Zwischenfügung je eines Streifens von der Faserbreite b m Stahl­fasern der Länge 1 in Axialrichtung und über die Blech-Teillänge L1 n Stahlfasern der Faserbreite b in Querrichtung nebeneinander angeordnet werden, wobei das Produkt aus der Faserbreite b und der Zahl n der nebeneinander angeordneten Fasern gleich einem ganzzahligen Vielfachen der Faserlänge 1 ist.2. The method according to claim 1, characterized in that over the sheet width B with the interposition of a strip of the fiber width bm steel fibers of length 1 in the axial direction and over the sheet part length L1 n steel fibers of the fiber width b are arranged side by side in the transverse direction, the Product of the fiber width b and the number n of the fibers arranged next to one another is an integer multiple of the fiber length 1. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß in dem a-ten Verfahrensschritt (m + 1) Streifen als Stahlfasern gestanzt werden.3. The method according to claim 2, characterized in that in the a-th process step (m + 1) strips are punched as steel fibers. 4. Verfahren nach Anspruch 2 oder 3, dadurch gekenn­zeichnet, daß bei a Verfahrensschritten ent­lang der Teillänge des Blechs L1 = n · b beim 1. Verfahrensschritt die (x·(a-1)+1)-ten Reihen,beim 2. Verfahrensschritt die (x·(a-1)+2)-ten Reihen, beim (a - 1)-ten Verfahrensschritt die letzten Reihen, und beim (a)-ten Verfahrensschritt die Streifen gestanzt werden, wobei x eine ganzzahlige Variable zwischen null und
Figure imgb0004
 ist.4. The method according to claim 2 or 3, characterized in that in a process steps along the partial length of the sheet L1 = n · b in the 1st process step the (x · (a-1) +1) -th rows, in the 2nd process step the (x · (a-1) +2) th rows, the last rows in the (a - 1) th process step, and the strips in the (a) th process step, where x is an integer variable between zero and
Figure imgb0004
 is. 5. Stahlfaser in der Form eines Blechstreifens als Bewehrungselement für Beton, dadurch gekennzeichnet, daß der Blechstreifen (1) an mindestens einem seiner Längsränder (2; 3) mit sickenartigen Ver­tiefungen (4) versehen ist.5. Steel fiber in the form of a sheet metal strip as a reinforcement element for concrete, characterized in that the sheet metal strip (1) is provided on at least one of its longitudinal edges (2; 3) with bead-like depressions (4). 6. Stahlfaser nach Anspruch 5, dadurch gekennzeichnet, daß die sickenartigen Vertiefungen (4) an dem einen Längsrand (2) gegenüber denen an dem anderen Längsrand (3) in Längsrichtung versetzt angeordnet sind.6. Steel fiber according to claim 5, characterized in that the bead-like depressions (4) on one longitudinal edge (2) with respect to those on the other longitudinal edge (3) are arranged offset in the longitudinal direction. 7. Stahlfaser nach Anspruch 5 oder 6, dadurch gekenn­zeichnet, daß symmetrisch zwischen jeweils zwei sickenartigen Vertiefungen (4) an dem einen Längsrand (2) eine sickenartige Vertiefung (4) an dem anderen Längsrand (3) vorgesehen ist.7. Steel fiber according to claim 5 or 6, characterized in that a bead-like depression (4) is provided on the other longitudinal edge (3) symmetrically between two bead-like depressions (4) on one longitudinal edge (2).
EP89106394A 1989-04-11 1989-04-11 Steel strip for concrete reinforcement Expired - Lifetime EP0392039B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP89106394A EP0392039B1 (en) 1989-04-11 1989-04-11 Steel strip for concrete reinforcement
AT89106394T ATE83406T1 (en) 1989-04-11 1989-04-11 STEEL FIBER AS A REINFORCEMENT ELEMENT FOR CONCRETE.
DE8989106394T DE58903045D1 (en) 1989-04-11 1989-04-11 STEEL FIBER AS REINFORCEMENT ELEMENT FOR CONCRETE.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89106394A EP0392039B1 (en) 1989-04-11 1989-04-11 Steel strip for concrete reinforcement

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EP0392039A1 true EP0392039A1 (en) 1990-10-17
EP0392039B1 EP0392039B1 (en) 1992-12-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529105A1 (en) * 1991-07-16 1993-03-03 UAB Unternehmens-Anlage-Beratungsgesellschaft mbH Process for the manufacture of a concrete reinforcing element
EP0559951A1 (en) * 1992-03-13 1993-09-15 VULKAN-HAREX STAHLFASERTECHNIK GmbH &amp; Co. KG Process and cutting tool for the production of fibres out of steel plates
WO2010009687A1 (en) * 2008-07-23 2010-01-28 Karl-Hermann Stahl Method for producing steel fibers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2723382A1 (en) * 1976-05-24 1977-12-08 Aida Keinosuke METHOD OF MANUFACTURING STEEL FIBERS FOR REINFORCED CONCRETE
FR2379332A1 (en) * 1977-02-02 1978-09-01 Gazzotti Jean Repetition process for cutting out similar metal items - uses punch and die whose complementary shapes suit different ones
BE892526A (en) * 1982-03-16 1982-07-16 Cardelli Ezio Wire mfr. from strip - using rolling mills with pairs of rolls with profiled working surfaces

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2723382A1 (en) * 1976-05-24 1977-12-08 Aida Keinosuke METHOD OF MANUFACTURING STEEL FIBERS FOR REINFORCED CONCRETE
FR2379332A1 (en) * 1977-02-02 1978-09-01 Gazzotti Jean Repetition process for cutting out similar metal items - uses punch and die whose complementary shapes suit different ones
BE892526A (en) * 1982-03-16 1982-07-16 Cardelli Ezio Wire mfr. from strip - using rolling mills with pairs of rolls with profiled working surfaces

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529105A1 (en) * 1991-07-16 1993-03-03 UAB Unternehmens-Anlage-Beratungsgesellschaft mbH Process for the manufacture of a concrete reinforcing element
EP0559951A1 (en) * 1992-03-13 1993-09-15 VULKAN-HAREX STAHLFASERTECHNIK GmbH &amp; Co. KG Process and cutting tool for the production of fibres out of steel plates
WO2010009687A1 (en) * 2008-07-23 2010-01-28 Karl-Hermann Stahl Method for producing steel fibers
EA018742B1 (en) * 2008-07-23 2013-10-30 Цент Унд Цент Гмбх Унд Ко. Кг Method for producing steel fibers
US9630226B2 (en) 2008-07-23 2017-04-25 Cent & Cent Gmbh & Co. Kg Method for producing steel fibers

Also Published As

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DE58903045D1 (en) 1993-01-28
EP0392039B1 (en) 1992-12-16

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