WO1995019480A1 - Acier d'armature lamine a froid et son procede de production - Google Patents

Acier d'armature lamine a froid et son procede de production Download PDF

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Publication number
WO1995019480A1
WO1995019480A1 PCT/EP1995/000154 EP9500154W WO9519480A1 WO 1995019480 A1 WO1995019480 A1 WO 1995019480A1 EP 9500154 W EP9500154 W EP 9500154W WO 9519480 A1 WO9519480 A1 WO 9519480A1
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WO
WIPO (PCT)
Prior art keywords
reinforcing steel
depressions
rod
rolled
steel according
Prior art date
Application number
PCT/EP1995/000154
Other languages
German (de)
English (en)
Original Assignee
Institut für Stahlbeton Bewehrung E.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6507949&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1995019480(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Institut für Stahlbeton Bewehrung E.V. filed Critical Institut für Stahlbeton Bewehrung E.V.
Priority to DE59500715T priority Critical patent/DE59500715D1/de
Priority to PL95315338A priority patent/PL177898B1/pl
Priority to SK909-96A priority patent/SK282802B6/sk
Priority to EP95906956A priority patent/EP0738361B2/fr
Publication of WO1995019480A1 publication Critical patent/WO1995019480A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete

Definitions

  • Reinforcing steel (prestressing steel) for the reinforcement of steel (prestressed) concrete has ribs in order to achieve a sufficient bond between the steel and the concrete. This ensures the power transmission between the steel and the concrete and vice versa so that short anchoring or transmission lengths are achieved in the state of use.
  • reinforcing bars in particular cold-formed reinforcing bars, such as those e.g. used for reinforcing steel mesh or reinforcing steel in the ring, changed.
  • These include e.g. new insights into non-linear design methods in reinforced concrete construction.
  • the combination of reinforcing steel has so far only been considered in the elastic range of the stress-strain line of the steel.
  • the use of non-linear design also includes the composite effect in the plastic area of steel (DE-Al-4011486). It has been shown here that a bond that is too "hard” on ribs on the concrete crack releases too little steel expansion. The aim is to achieve a bond that allows the previous structural regulations in use, but is softer in the plastic area of the stress-strain line of the reinforcing steel.
  • a large part of the reinforcing steel is produced by hot or cold working as reinforcing steel in the ring and processed into steel bars or reinforcing steel mesh.
  • it In order to shape the steel in the way it can serve as reinforcement, it must be straightened using suitable machines. Ribbed steels are always out of round. Furthermore, the ribs are usually heavily removed during the straightening process. The ribs on the circumference of the bar also ignite considerable noise during the straightening process.
  • the aim is to improve the straightening properties and reduce the noise during straightening. A considerable part of the mass is in the ribs of the reinforcing steel. To produce the ribs, up to 25% deformation is necessary, which alone means a large expenditure of energy and accordingly consume a lot of energy. With a view to saving energy, there is therefore a need to reduce the energy to be generated to produce the ribs.
  • Reinforcing steel mesh is welded in systems that run at up to 120 cycles / min. It is only possible to achieve consistently good welded connections if the roundness caused by the ribs is kept as small as possible. This applies especially to the welding of double bars. In view of this, rods with a surface that come as close as possible to smooth round steel should be aimed for.
  • a reinforcing steel of this type is known from DE-AS 10 84 464.
  • This document describes a reinforcement wire or rod, in particular for prestressed concrete, the surface of which has regularly repeated recesses on both sides, the recesses being elliptical and taking up almost half the circumference of the rod.
  • the depressions are separated in the area of their short axis by narrow ridges that are oblique to the rod axis. Similar to bevelled ribs, these beads are formed by milling in the embossing roll, into which the material is displaced during rolling.
  • GB-PS 1 343 757 describes a reinforcing steel of the type specified in the preamble of claim 1, in which the depressions are elliptical, the longitudinal axes of the ellipses being at an angle of inclination of 30 to 70 ° with respect to the rod axis can be ordered.
  • the flanks of the depressions are formed symmetrically and the flank angle is limited to 50 °.
  • the invention is based on the object of designing the surface shape of a reinforcing steel in accordance with the preamble of claim 1 in such a way that an adequate bond is ensured in spite of a lower deformation effort which enables better ductility parameters Agt and Rm / Re.
  • plastic deformations of the reinforcing steel non-linear design
  • a soft bond should be created that is as soft as possible large relative shifts between steel and concrete allows.
  • the surface shape of the reinforcing steel should, if possible, be adjusted to that of a round rod with a smooth surface with a view to good straightening ability and improved weldability. With a view to a high fatigue strength, notch stresses should be kept as low as possible.
  • a method for producing a reinforcing steel with the properties mentioned is to be specified.
  • the reinforcing steel according to the invention is characterized by the features of claim 1.
  • Advantageous embodiments of this reinforcing steel can be found in claims 2 to 12.
  • the method according to the invention is characterized by the features of claim 13.
  • Advantageous refinements of the method can be found in the remaining claims.
  • a graduated “failure mode” is achieved through the formation of the depressions with different depths and through the formation of projections or depressions in the bottom surface of the depressions.
  • the concrete bracket shears off at a large depression, it shears off at a small depression and thereby exposes an expansion path.
  • a protrusion or trough is formed in the bottom surface of a recess. This mechanism enables larger ones Relative shifts between steel and concrete.
  • the reinforcing steel according to the invention is therefore particularly suitable as a reinforcement element for reinforced concrete components that are dimensioned using local plastic deformations of the reinforcement.
  • the boundary line of the depressions is formed from arcs and straight sections in which notch stresses can be concentrated are avoided, and the flanks of the depressions are rounded and merge into the floor surfaces , largely avoided.
  • the surface portions of the smooth surface are enlarged in comparison to that of the depressions, thereby improving directivity and sweatability.
  • the depressions of adjacent longitudinal rows should be offset from one another in the longitudinal direction of the rod.
  • a multi-stage process is used to produce the rolled reinforcing steel.
  • a wire rod is rolled into a round bar in a first cold-forming process with a cross-sectional reduction of 8 to 15%, and the recesses are rolled in a further cold-forming process with a cross-sectional reduction of 2 to 7%.
  • the first deformation process two or even three cold deformation processes, each with a correspondingly smaller cross-sectional reduction, can be provided, in which the rod is brought to a round cross-section before the depressions are rolled in.
  • Show it 1 shows the development of a reinforcing steel according to the invention with three longitudinal rows of elliptical depressions
  • FIG. 2 shows the section II-II of FIG. 2 in an enlarged view
  • FIG. 3 shows a longitudinal row of elliptical depressions arranged obliquely to the rod axis in a representation corresponding to FIG. 1,
  • FIG. 4 shows a diagram which shows the composite properties of a reinforcing steel according to the invention in comparison with those of a known cold-ribbed reinforcing steel
  • FIG. 5 shows a cross section corresponding to FIG. 2 of a further exemplary embodiment
  • FIGS. 2 and 3 corresponding views of another reinforcing steel.
  • the section of a reinforcing steel shown in the development in FIG. 1 has three longitudinal rows 1, 2, 3 of depressions 4.
  • the longitudinal rows are evenly distributed over the circumference of the bar.
  • the depressions of adjacent longitudinal rows are offset from one another in the longitudinal direction of the rod.
  • the degree of displacement corresponds to approximately one third of the distance between two adjacent depressions in a longitudinal row.
  • the rod surface 5 is smooth, i.e. it corresponds to that of a smooth round rod.
  • the boundary line of a depression is formed by circular arcs 6 and 7 which have different radii and are each arranged axially symmetrically with respect to the depression 4.
  • the arcs 6 with a smaller radius are symmetrical to the axis of symmetry 8 and the arcs with a larger radius are arranged symmetrically to the axis of symmetry 9.
  • the axis of symmetry 9 the circular arc 7 with a larger radius runs in the exemplary embodiment according to FIG. 1 at 90 ° to the rod axis, ie transverse to the rod axis, the axis of symmetry 8 runs parallel to the rod axis.
  • the size and spacing of the depressions 4 are determined as follows in the exemplary embodiment according to FIG. 1:
  • D the extension of the recess in the circumferential direction of the rod
  • B the extension of the recess in the longitudinal direction of the rod, measured in the middle of the transverse extension D
  • s the distance between the boundary lines of adjacent recesses in the longitudinal direction of the rod, measured in the center of the transverse extension D
  • b the distance between the boundary lines of adjacent longitudinal rows of depressions in the transverse direction of the rod
  • t is the depth of the depression.
  • the proportion of the total area of the depressions to the total area of the rod is approximately 40%.
  • the surface design of the reinforcing steel according to the invention is more suitable for design methods in which local plastic deformations of the reinforcement, ie a joint rotation is used, than bars with ribs or ridges applied to the surface, since the surface design according to the invention provides a "soft" bond is made possible.
  • FIG. 3 shows a section of a row of ribs of a further embodiment of a reinforcing steel according to the invention.
  • oval depressions are arranged obliquely to the rod axis.
  • the angle with respect to the bar axis is indicated with and should be in the range between 60 ° and 90 °.
  • An angle 90 ° corresponds to the embodiment according to FIG. 1.
  • B means the extent of the depression in the longitudinal direction of the rod, measured in the middle of the transverse dimension D, i.e. measured along the center line of the relevant longitudinal row of depressions.
  • D i.e. measured along the center line of the relevant longitudinal row of depressions.
  • parameter s i.e. the distance between the boundary lines of adjacent depressions in the longitudinal direction of the rod.
  • the method according to the invention for producing the reinforcing steel described differs from the known methods in that a round wire rod is first cold-rolled into a round bar in a first cold-forming process and the flat depressions are rolled in in a further cold-forming process.
  • the first cold forming process which can also be divided into two or three cold forming processes, primarily serves to increase the strength of the reinforcing steel. Depending on the starting material - this can be wire rods 380 to 420 of BSTM quality - a cross-sectional deformation of 10 to 20% will be required here, which can be reduced accordingly when dividing into 2 or 3 cold-forming processes. If 3rd Cold forming processes are provided, these enable the production of an exact round cross section of the desired dimension. In the case of several cold forming processes for the production of the round steel, the reduction in cross section in the first deformation step should be greater than in the subsequent steps for the production of the round steel.
  • the reinforcing steel or concrete wire according to the invention is primarily intended for the production of reinforcing steel mats.
  • a minimum yield strength of 500 N / mm 2 is prescribed for this.
  • Suitable starting materials for the production of the reinforcing steel are, in particular, wire rods with a yield strength of 380 to 420 N / mm 2 with analytical values of carbon: 0.04 to 0.14% by weight manganese: 0.35 to 0.70% by weight
  • Silicon 0.20 to 0.30% by weight.
  • the process according to the invention was carried out in a first shaping operation a round round wire with a diameter of 7.5 mm is rolled onto a smooth round wire rod with a diameter of 8.0 mm.
  • the cross-sectional reduction was 11%.
  • the result of the wire according to the invention is denoted by I u and I 0, respectively, the indices u and o signifying underneath and underneath, respectively.
  • the comparison wire is designated II U or II 0 .
  • the extension path s, measured at the tension-free rod end, is plotted on the abscissa, and the related bond tension is plotted on the ordinate.
  • the reinforcing steel according to the invention is thus characterized by a composite that is roughly the same size in use, but which permits much larger displacements.
  • a further improvement with regard to a “soft” bond can be achieved if additional measures are provided that implement a graded “failure mode”. Such measures are shown in Fig. 5 and in Figs. 6 and 7.
  • the illustration corresponds to that of FIG. 2, ie it is a longitudinal section of the rod through the center of the depressions - the depressions are formed at different depths t1 or t2.
  • the concrete bracket is sheared off in the area of the small depression tl before it is in the Area of the large depressions t2 is sheared off.
  • a greater elongation value is released and a softer bond is achieved.
  • a graded "failure mode” is also achieved if the depressions 4 have different transverse dimensions D (see FIG. 3), measured perpendicular to the longitudinal axis of the rod between the tangents parallel to the longitudinal axis at the boundary line of the relevant depression, exhibit.
  • FIGS. 6 and 7 which correspond to FIGS. 2 and 3, at least some of the depressions have projections 13. Instead of the projections, troughs could also be provided within the bottom surface of the depressions.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
  • Wire Processing (AREA)

Abstract

L'invention concerne un acier d'armature comportant des échancrures (4) laminées dans une barre d'acier de section approximativement circulaire. Les échancrures sont réalisées lors du dévidage de l'acier d'armature à travers des arcs de cercle de différents rayons, disposés de manière axisymétrique par rapport à l'échancrure. Les échancrures sont laminées dans la surface de la barre, à une profondeur constante et sont délimitées par des flancs raides, ce qui assure une liaison suffisante, en dépit d'une moindre complexité technique en matière de déformation, qui permet d'obtenir de meilleurs paramètres de ductilité. De plus, l'acier d'armature produit en couronne présente une meilleure aptitude au dressage et au soudage lors de la production de treillis soudés pour béton armé. Un procédé de production d'un acier d'armature de ce type comporte au moins deux étapes de déformation.
PCT/EP1995/000154 1994-01-14 1995-01-16 Acier d'armature lamine a froid et son procede de production WO1995019480A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59500715T DE59500715D1 (de) 1994-01-14 1995-01-16 Kaltgewalzter betonstahl und verfahren zu dessen herstellung
PL95315338A PL177898B1 (pl) 1994-01-14 1995-01-16 Stal zbrojeniowa do betonu, walcowana na zimno i sposób wytwarzania stali zbrojeniowej do betonu, walcowanej na zimno
SK909-96A SK282802B6 (sk) 1994-01-14 1995-01-16 Betonárska oceľ valcovaná za studena a spôsob jej výroby
EP95906956A EP0738361B2 (fr) 1994-01-14 1995-01-16 Acier d'armature lamine a froid et son procede de production

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4400974.7 1994-01-14
DE4400974A DE4400974A1 (de) 1994-01-14 1994-01-14 Betonstahl

Publications (1)

Publication Number Publication Date
WO1995019480A1 true WO1995019480A1 (fr) 1995-07-20

Family

ID=6507949

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/000154 WO1995019480A1 (fr) 1994-01-14 1995-01-16 Acier d'armature lamine a froid et son procede de production

Country Status (10)

Country Link
EP (1) EP0738361B2 (fr)
AT (1) ATE158634T1 (fr)
CZ (1) CZ289576B6 (fr)
DE (2) DE4400974A1 (fr)
DK (1) DK0738361T4 (fr)
HU (1) HU217903B (fr)
LT (1) LT4139B (fr)
PL (1) PL177898B1 (fr)
SK (1) SK282802B6 (fr)
WO (1) WO1995019480A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002300805B2 (en) * 2001-08-28 2007-02-15 The Australian Steel Company (Operations) Pty Ltd Metal mesh and method for producing a wire component therefor
DE102007027015A1 (de) * 2007-06-08 2008-12-11 Schöck Bauteile GmbH Bewehrungsstab

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1027171A (fr) * 1949-11-04 1953-05-08 Procédé de fabrication de fers d'armature munis de saillies et machines en permettant la fabrication
FR1089781A (fr) * 1953-12-21 1955-03-22 Moossche Eisenwerke Ag Armature pour béton
CH313327A (de) * 1953-02-14 1956-04-15 Tektonik Ag Armierungsnetz für Eisenbeton
US2821727A (en) * 1955-05-16 1958-02-04 John C Corckran Corrugated nail making machine having a combined wire feeding and rolling means
FR1192414A (fr) * 1957-01-22 1959-10-26 Fil d'acier de grande résistance, destiné notamment à être utilisé comme armature lâche dans du béton armé
FR1202576A (fr) * 1957-09-28 1960-01-12 Baustahlgewebe Gmbh Procédé pour l'obtention d'acier d'armature rainuré transversalement sur certaines parties de sa périphérie
FR1207928A (fr) * 1958-05-05 1960-02-19 Mauser Kg Natte d'armature pour béton, à barres d'armature nervurées
DE1084464B (de) * 1953-09-03 1960-06-30 Moossche Eisenwerke Ag Bewehrungsdraht oder -stab, insbesondere fuer Spannbeton, sowie Verfahren und Vorrichtung zu seiner Herstellung
FR1240643A (fr) * 1959-07-29 1960-09-09 Barre d'acier pour armature de béton
US3256727A (en) * 1965-07-21 1966-06-21 Takaishi Yoshio Method and apparatus for producing deformed steel bars
DE1402731B1 (de) * 1960-06-21 1969-09-04 Gillberg Dipl Ing Johannes Verfahren und Vorrichtung zum kontinuierlichen Herstellen rundquerschnittiger,mit haftungserhoehenden Einpraegungen versehener Betonbaustaehle
FR2127426A5 (fr) * 1970-02-26 1972-10-13 Wischin Josef
FR2296693A1 (fr) * 1973-11-28 1976-07-30 Aurelio Leonardo Procede de fabrication de fers, destines notamment a l'armature du beton, et fers ainsi obtenus
DE4011486A1 (de) * 1990-04-09 1991-10-10 Inst Stahlbeton Bewehrung Ev Betonrippenstahl mit kaltgewalzten schraegrippen und dessen verwendung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU37094A1 (fr) * 1958-04-12
SU1025832A1 (ru) * 1982-02-15 1983-06-30 Научно-Исследовательский Институт Бетона И Железобетона Госстроя Ссср Арматурна проволока периодического профил
SU1364675A1 (ru) * 1986-07-16 1988-01-07 Магнитогорский горно-металлургический институт им.Г.И.Носова Арматурна проволока периодического профил
DE4011487A1 (de) 1990-04-09 1991-10-10 Henkel Kgaa Tensidmischung fuer die verwendung in wasch- und reinigungsmitteln

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1027171A (fr) * 1949-11-04 1953-05-08 Procédé de fabrication de fers d'armature munis de saillies et machines en permettant la fabrication
CH313327A (de) * 1953-02-14 1956-04-15 Tektonik Ag Armierungsnetz für Eisenbeton
DE1084464B (de) * 1953-09-03 1960-06-30 Moossche Eisenwerke Ag Bewehrungsdraht oder -stab, insbesondere fuer Spannbeton, sowie Verfahren und Vorrichtung zu seiner Herstellung
FR1089781A (fr) * 1953-12-21 1955-03-22 Moossche Eisenwerke Ag Armature pour béton
US2821727A (en) * 1955-05-16 1958-02-04 John C Corckran Corrugated nail making machine having a combined wire feeding and rolling means
FR1192414A (fr) * 1957-01-22 1959-10-26 Fil d'acier de grande résistance, destiné notamment à être utilisé comme armature lâche dans du béton armé
FR1202576A (fr) * 1957-09-28 1960-01-12 Baustahlgewebe Gmbh Procédé pour l'obtention d'acier d'armature rainuré transversalement sur certaines parties de sa périphérie
FR1207928A (fr) * 1958-05-05 1960-02-19 Mauser Kg Natte d'armature pour béton, à barres d'armature nervurées
FR1240643A (fr) * 1959-07-29 1960-09-09 Barre d'acier pour armature de béton
DE1402731B1 (de) * 1960-06-21 1969-09-04 Gillberg Dipl Ing Johannes Verfahren und Vorrichtung zum kontinuierlichen Herstellen rundquerschnittiger,mit haftungserhoehenden Einpraegungen versehener Betonbaustaehle
US3256727A (en) * 1965-07-21 1966-06-21 Takaishi Yoshio Method and apparatus for producing deformed steel bars
FR2127426A5 (fr) * 1970-02-26 1972-10-13 Wischin Josef
GB1334757A (en) * 1970-02-26 1973-10-24 Wischin J Reinforcing bars for concrete and their manufacture
FR2296693A1 (fr) * 1973-11-28 1976-07-30 Aurelio Leonardo Procede de fabrication de fers, destines notamment a l'armature du beton, et fers ainsi obtenus
DE4011486A1 (de) * 1990-04-09 1991-10-10 Inst Stahlbeton Bewehrung Ev Betonrippenstahl mit kaltgewalzten schraegrippen und dessen verwendung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002300805B2 (en) * 2001-08-28 2007-02-15 The Australian Steel Company (Operations) Pty Ltd Metal mesh and method for producing a wire component therefor
DE102007027015A1 (de) * 2007-06-08 2008-12-11 Schöck Bauteile GmbH Bewehrungsstab

Also Published As

Publication number Publication date
HUT76083A (en) 1997-06-30
LT4139B (en) 1997-04-25
ATE158634T1 (de) 1997-10-15
LT96105A (en) 1996-11-25
DK0738361T3 (da) 1998-02-16
HU217903B (hu) 2000-05-28
PL177898B1 (pl) 2000-01-31
SK90996A3 (en) 1997-01-08
DE4400974A1 (de) 1995-07-20
CZ9602010A3 (en) 1996-10-16
EP0738361A1 (fr) 1996-10-23
DE59500715D1 (de) 1997-10-30
EP0738361B2 (fr) 2005-04-06
DK0738361T4 (da) 2005-04-25
CZ289576B6 (cs) 2002-02-13
HU9601912D0 (en) 1996-09-30
EP0738361B1 (fr) 1997-09-24
SK282802B6 (sk) 2002-12-03

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