EP0187075A1 - Metallic reinforcement for reinforced concrete - Google Patents

Metallic reinforcement for reinforced concrete Download PDF

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Publication number
EP0187075A1
EP0187075A1 EP85402355A EP85402355A EP0187075A1 EP 0187075 A1 EP0187075 A1 EP 0187075A1 EP 85402355 A EP85402355 A EP 85402355A EP 85402355 A EP85402355 A EP 85402355A EP 0187075 A1 EP0187075 A1 EP 0187075A1
Authority
EP
European Patent Office
Prior art keywords
ribs
reinforced concrete
slightly
section
core
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.)
Granted
Application number
EP85402355A
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German (de)
French (fr)
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EP0187075B1 (en
Inventor
Jean Albert Edouard René Corny
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.)
Acieries De Montereau Sam Ste
Original Assignee
Acieries De Montereau Sam Ste
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
Application filed by Acieries De Montereau Sam Ste filed Critical Acieries De Montereau Sam Ste
Priority to AT85402355T priority Critical patent/ATE35836T1/en
Publication of EP0187075A1 publication Critical patent/EP0187075A1/en
Application granted granted Critical
Publication of EP0187075B1 publication Critical patent/EP0187075B1/en
Expired legal-status Critical Current

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    • 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

  • the present invention relates to a metal frame for reinforced concrete.
  • metal reinforcements for reinforced concrete hot formed, in the form of bars, with an oval cross section, provided with oblique ribs each extending over approximately 180 ° from the periphery of the bar, the inclination of said ribs. about the axis being about 60 °.
  • the rollers of the latter subject the bar to torsional forces generating in the latter stresses which are released when said bar is subsequently subjected to a folding force.
  • the frame, object of the present invention which remedies these drawbacks are remarkable in that the core of the frame has a square section and has on each of its faces inclined ribs extending over a little less than 90 °.
  • the frame has a central core l, the cross section of which assumes the shape of a square, the vertices 2 of which are truncated, defining four lateral faces 3 each having ribs 4 oblique with respect to to the axis XX l of the armature and extending over a little less than 90 °.
  • the angle formed between the ribs and the aforementioned axis is of the order of 25 ° to 45 °.
  • the assembly is substantially in a circle and the vertices 2, truncated, are rounded.
  • the distance Dl separating the center C of the frame and the apex of the rib is slightly less than that D2 separating said center and an apex 2 of the core. In this way, the contacts between the frame and the V-shaped section rollers or the rotating frames of the straightening machine, are made at the vertices 2, which prevents crushing of said ribs.
  • the ribs of two adjacent faces are associated in pairs so that the apex of each rib on one face is contained in an oblique plane passing through the apex of a rib on the other face.
  • the trace of one of these planes appears in YY i in Figure 1.
  • the ribs of the other two faces are inclined in opposite directions.
  • the faces of the core are slightly curved.
  • the sections of the armature are substantially uniform and are inscribed in a circle.
  • the reinforcement bar can have a polygonal section with n sides defining n faces each having, or some of them, ribs similar to those 4.

Abstract

1. Metal reinforcement for reinforced concrete of the kind having a web with a convex polygonal section whose apices are slightly frustroconical with oblique ribs on its slightly convex faces and whose section is subtantially inscribed inside a circle, characterized in that the distance separating the most convex part of the ribs (4) and the centre of the web (1) is slightly less than that separating said center and said frustoconical apices (2).

Description

La présente invention est relative à une armature métallique pour béton armé.The present invention relates to a metal frame for reinforced concrete.

On connaît des armatures métalliques pour béton armé, façonnées à chaud, se présentant sous la forme de barres, à section droite ovale, munies de nervures obliques s'étendant chacune sur environ 180° de la périphérie de la barre, l'inclinaison desdites nervures par rapport à l'axe étant d'environ 60°.There are known metal reinforcements for reinforced concrete, hot formed, in the form of bars, with an oval cross section, provided with oblique ribs each extending over approximately 180 ° from the periphery of the bar, the inclination of said ribs. about the axis being about 60 °.

En raison de leur mode d'élaboration, à chaud, ces produits sont livrés à l'utilisateur sous forme de bobines dont les spires sont déformées.Il convient donc de redresser les spires à l'aide de machines spéciales pour obtenir, après sectionnement, soit des barres rectilignes, soit des cadres, étriers,etc.Due to their hot production method, these products are delivered to the user in the form of coils whose turns are deformed. It is therefore advisable to straighten the turns using special machines to obtain, after cutting, either straight bars or frames, stirrups, etc.

Après pliage, on a constaté que les deux brins extrêmes des pièces ne restaient pas dans un même plan mais formaient entre eux un angle important rendant ainsi celles-ci inaptes à la fonction pour laquelle elles étaient destinées.After folding, it has been found that the two extreme strands of the pieces do not remain in the same plane but form a large angle between them, thus rendering them unsuitable for the function for which they were intended.

Ce phénomène peut s'expliquer par le fait qu'en raison des nervures, le contour de la section droite de la barre évolue d'une extrémité à l'autre sans présenter d'axe de symétrie et s'éloigne de façon importante du contour idéal qui doit être circulaire.This phenomenon can be explained by the fact that due to the ribs, the contour of the straight section of the bar evolves from one end to the other without presenting an axis of symmetry and moves away significantly from the contour ideal which must be circular.

De ce fait, durant le passage dans les blocs dresseurs des machines les galets de ceux-ci soumettent la barre à des efforts de torsion engendrant dans cette dernière des contraintes qui se libèrent lorsque ladite barre est soumise ultérieurement à un effort de pliage.Therefore, during the passage through the blocking blocks of the machines, the rollers of the latter subject the bar to torsional forces generating in the latter stresses which are released when said bar is subsequently subjected to a folding force.

On a constaté aussi que le relief des nervures était très atténué après dressage. Ceci s'explique par le fait que, chaque série de nervures s'étendant sur environ I80°, le contact avec les galets s'effectue sensiblement en des points situés sur le sommet desdites nervures. De ce fait, pour réaliser un bon entraînement de la barre à redresser il fallait que les galets entraîneurs exercent un effort très important sur lesdites nervures.Ce phénomène de dégradation des nervures est encore plus important sur les machines à dresser dites "à cadre tournant".It was also found that the relief of the ribs was very attenuated after dressing. This is explained by the fact that, each series of ribs extending over approximately 180 °, the contact with the rollers takes place substantially at points situated on the top of said ribs. Therefore, to achieve a good drive of the straightening bar it was necessary that the drive rollers exert a very large force on said ribs. This phenomenon of degradation of the ribs is even more important on straightening machines called "rotating frame" .

L'armature, objet de la présente invention, qui remédie à ces inconvénients, est remarquable en ce que l'âme de l'armature présente une section carrée et comporte sur chacune de ses faces des nervures inclinées s'étendant sur un peu moins de 90°.The frame, object of the present invention, which remedies these drawbacks are remarkable in that the core of the frame has a square section and has on each of its faces inclined ribs extending over a little less than 90 °.

L'invention sera mieux comprise par la description qui va suivre, faite en se référant aux dessins annexés à titre d'exemple indicatif seulement, sur lesquels :

  • La figure 1 est une vue en élévation d'une armature conforme à l'invention ;
  • Les figures 2,3 et 4 sont des sections effectuées par des plans passant respectivement par les lignes II-II, III-III et IV-IV de la figure 1.
The invention will be better understood from the description which follows, made with reference to the accompanying drawings by way of indicative example only, in which:
  • Figure 1 is an elevational view of a frame according to the invention;
  • Figures 2,3 and 4 are sections made by planes passing respectively through the lines II-II, III-III and IV-IV of Figure 1.

En se reportant aux dessins, on voit que l'armature présente une âme centrale l, dont la section droite affecte la forme d'un carré,dont les sommets 2 sont tronqués, définissant quatre faces latérales 3 présentant chacune des nervures 4 obliques par rapport à l'axe X-Xl de l'armature et s'étendant sur un peu moins de 90°.L'angle formé entre les nervures et l'axe précité est de l'ordre de 25° à 45°.Referring to the drawings, it can be seen that the frame has a central core l, the cross section of which assumes the shape of a square, the vertices 2 of which are truncated, defining four lateral faces 3 each having ribs 4 oblique with respect to to the axis XX l of the armature and extending over a little less than 90 °. The angle formed between the ribs and the aforementioned axis is of the order of 25 ° to 45 °.

Comme cela ressort de la figure 2, l'ensemble s'inscrit sensiblement dans un cercle et les sommets 2, tronqués, sont arrondis.As is apparent from Figure 2, the assembly is substantially in a circle and the vertices 2, truncated, are rounded.

Cependant et selon une caractéristique de l'invention, la distance Dl séparant le centre C de l'armature et le sommet de la nervure est légèrement inférieure à celle D2 séparant ledit centre et un sommet 2 de l'âme. De cette façon, les contacts entre l'armature et les galets à section en forme de Vé ou les cadres tournants de la machine à dresser, s'effectuent au niveau des sommets 2,ce qui évite l'écrasement desdites nervures.However and according to a characteristic of the invention, the distance Dl separating the center C of the frame and the apex of the rib is slightly less than that D2 separating said center and an apex 2 of the core. In this way, the contacts between the frame and the V-shaped section rollers or the rotating frames of the straightening machine, are made at the vertices 2, which prevents crushing of said ribs.

Selon un mode de réalisation, les nervures de deux faces adjacentes sont associées par paires de façon à ce que le sommet de chaque nervure d'une face soit contenu dans un plan oblique passant par le sommet d'une nervure de l'autre face. La trace de l'un de ces plans apparaît en Y-Yi sur la figure 1.According to one embodiment, the ribs of two adjacent faces are associated in pairs so that the apex of each rib on one face is contained in an oblique plane passing through the apex of a rib on the other face. The trace of one of these planes appears in YY i in Figure 1.

Les nervures des deux autres faces ( en pointillé sur la figure 1) sont inclinées en sens inverse.The ribs of the other two faces (in dotted lines in FIG. 1) are inclined in opposite directions.

Selon une autre caractéristique de l'invention,les faces de l'âme sont légèrement bombées.According to another characteristic of the invention, the faces of the core are slightly curved.

Comme cela ressort des épures des figures 2 à 4, les sections de l'armature sont sensiblement uniformes et s'inscrivent dans un cercle.As can be seen from the diagrams in FIGS. 2 to 4, the sections of the armature are substantially uniform and are inscribed in a circle.

A la suite d'essais, il a été constaté que l'armature traversait la machine à dresser sans effectuer de rotation autour de son axe. Il a été constaté aussi que lors d'un pliage ultérieur les deux brins extrêmes restaient dans le plan dans lequel le pliage avait été effectué.Following tests, it was found that the reinforcement passed through the straightening machine without rotating around its axis. It was also found that during a subsequent folding the two extreme strands remained in the plane in which the folding had been carried out.

Bien entendu, la présente invention ne se limite pas au mode de réalisation décrit et représenté mais s'étend, au contraire, à toutes variantes de formes et dimensions.Of course, the present invention is not limited to the embodiment described and shown but extends, on the contrary, to all variants of shapes and dimensions.

C'est ainsi,entre autres, que la barre de l'armature peut présenter une section polygonale à n côtés définissant n faces présentant chacune, ou certaine d'entre elles, des nervures analogues à celles 4.Thus, among other things, the reinforcement bar can have a polygonal section with n sides defining n faces each having, or some of them, ribs similar to those 4.

Claims (3)

1-Armature métallique pour béton armé du genre de celles présentant une âme ayant une section polygonale dont les sommets sont légèrement tronqués,comportant sur ses faces légèrement bombées, des nervures obliques et dont la section s'inscrit sensiblement dans un cercle, caractérisée en ce que la distance séparant la partie la plus bombée des nervures (4) et le centre de l'âme (1) est légèrement inférieure à celle séparant ledit centre et lesdits sommets tronqués (2).1-Metallic reinforcement for reinforced concrete of the kind having a core having a polygonal section, the vertices of which are slightly truncated, comprising on its slightly curved faces, oblique ribs and the section of which is substantially in a circle, characterized in that that the distance separating the most domed part of the ribs (4) and the center of the core (1) is slightly less than that separating said center and said truncated vertices (2). 2- Armature métallique pour béton armé, selon la revendication l,caractérisée en ce que la section de l'âme est carrée.2- metal frame for reinforced concrete, according to claim l, characterized in that the section of the core is square. 3- Armature métallique pour béton armé, selon l'une quelconque des revendications 1 et 2, caractérisée en ce que les sommets tronqués (2) sont arrondis.3- metal frame for reinforced concrete, according to any one of claims 1 and 2, characterized in that the truncated vertices (2) are rounded.
EP85402355A 1984-12-07 1985-11-29 Metallic reinforcement for reinforced concrete Expired EP0187075B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85402355T ATE35836T1 (en) 1984-12-07 1985-11-29 STEEL REINFORCEMENT FOR CONCRETE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8418705A FR2574453B1 (en) 1984-12-07 1984-12-07 METAL REINFORCEMENT FOR REINFORCED CONCRETE
FR8418705 1984-12-07

Publications (2)

Publication Number Publication Date
EP0187075A1 true EP0187075A1 (en) 1986-07-09
EP0187075B1 EP0187075B1 (en) 1988-07-20

Family

ID=9310351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402355A Expired EP0187075B1 (en) 1984-12-07 1985-11-29 Metallic reinforcement for reinforced concrete

Country Status (14)

Country Link
EP (1) EP0187075B1 (en)
JP (1) JPS61191752A (en)
AT (1) ATE35836T1 (en)
AU (1) AU573927B2 (en)
BR (1) BR8506091A (en)
DE (1) DE3563864D1 (en)
DK (1) DK168830B1 (en)
ES (1) ES295972Y (en)
FR (1) FR2574453B1 (en)
GR (1) GR852916B (en)
HK (1) HK77589A (en)
PT (1) PT81562B (en)
SG (1) SG78688G (en)
ZA (1) ZA859048B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991009188A1 (en) * 1989-12-07 1991-06-27 'DECEMBER 4' Drótmu^'vek Steel wire for reinforcing the embedding material, especially concrete, and process for making it
DE202014003841U1 (en) 2013-05-07 2014-06-11 Badische Stahlwerke Gmbh rebar

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104164949A (en) * 2014-08-25 2014-11-26 江苏永钢集团有限公司 Twisted steel with nominal diameter of not more than 20mm for preventing warping during hoop manufacturing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR501776A (en) * 1919-07-19 1920-04-23 Grover Cleveland Royse reinforcing elements for concrete constructions
FR1564544A (en) * 1967-01-14 1969-04-25
FR2031405A7 (en) * 1969-02-13 1970-11-20 Hochwald Drahtwerk Gmbh
DE3341957A1 (en) * 1982-11-29 1984-05-30 Walter Dipl.-Ing. 8000 München Hufnagl Ribbed concrete reinforcing steel as well as process for its production
CH651616A5 (en) * 1981-06-04 1985-09-30 Moos Stahl Ag Reinforcing bar for reinforced concrete

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5222623B2 (en) * 1972-10-17 1977-06-18

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR501776A (en) * 1919-07-19 1920-04-23 Grover Cleveland Royse reinforcing elements for concrete constructions
FR1564544A (en) * 1967-01-14 1969-04-25
FR2031405A7 (en) * 1969-02-13 1970-11-20 Hochwald Drahtwerk Gmbh
CH651616A5 (en) * 1981-06-04 1985-09-30 Moos Stahl Ag Reinforcing bar for reinforced concrete
DE3341957A1 (en) * 1982-11-29 1984-05-30 Walter Dipl.-Ing. 8000 München Hufnagl Ribbed concrete reinforcing steel as well as process for its production

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991009188A1 (en) * 1989-12-07 1991-06-27 'DECEMBER 4' Drótmu^'vek Steel wire for reinforcing the embedding material, especially concrete, and process for making it
DE202014003841U1 (en) 2013-05-07 2014-06-11 Badische Stahlwerke Gmbh rebar
DE102013208413A1 (en) 2013-05-07 2014-11-13 Badische Stahlwerke Gmbh Reinforcing steel, production method for reinforcing steel
DE102013208413B4 (en) 2013-05-07 2019-10-10 Badische Stahlwerke Gmbh Reinforcing steel, production method for reinforcing steel

Also Published As

Publication number Publication date
DK168830B1 (en) 1994-06-20
AU5042285A (en) 1986-06-12
AU573927B2 (en) 1988-06-23
ES295972U (en) 1987-06-16
DK565685A (en) 1986-06-08
JPS61191752A (en) 1986-08-26
ES295972Y (en) 1988-10-01
PT81562B (en) 1987-09-18
FR2574453A1 (en) 1986-06-13
PT81562A (en) 1985-12-01
FR2574453B1 (en) 1987-12-18
GR852916B (en) 1986-04-07
DK565685D0 (en) 1985-12-06
HK77589A (en) 1989-10-06
BR8506091A (en) 1986-08-19
ZA859048B (en) 1986-11-26
DE3563864D1 (en) 1988-08-25
ATE35836T1 (en) 1988-08-15
EP0187075B1 (en) 1988-07-20
SG78688G (en) 1989-09-01

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