EP0187075B1 - Metallic reinforcement for reinforced concrete - Google Patents
Metallic reinforcement for reinforced concrete Download PDFInfo
- Publication number
- EP0187075B1 EP0187075B1 EP85402355A EP85402355A EP0187075B1 EP 0187075 B1 EP0187075 B1 EP 0187075B1 EP 85402355 A EP85402355 A EP 85402355A EP 85402355 A EP85402355 A EP 85402355A EP 0187075 B1 EP0187075 B1 EP 0187075B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ribs
- reinforced concrete
- slightly
- section
- web
- 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
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Classifications
-
- 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 bending force.
- Document FR-A-1 564 544 discloses an armature comprising a cruciform cross-section whose wings are joined 'by oblique ribs, the whole being substantially inscribed in a square.
- Such a frame has very large variations in its section which will generate torsional forces during dressing.
- Document FR-A- 2,031,405 discloses an armature comprising a core with a convex polygonal section and comprising oblique ribs, the whole being inscribed in a circle and being obtained, by cold forming, of a round rod .
- the present invention which overcomes these drawbacks, relates to a reinforcement of the kind of those having a core having a convex polygonal section whose vertices are slightly truncated, comprising on its slightly curved faces, oblique ribs and whose section is substantially in a circle, characterized in that the distance separating the most domed part of the ribs and the center of the core is slightly less than that separating said center and said truncated vertices.
- 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.
- the armature has a central core 1, the cross section of which takes the form of a square, the vertices 2 of which are truncated, defining four lateral faces 3 each having ribs 4 oblique to each other. at axis XX, 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 D1 separating the center C of the frame and the apex of the nevure is slightly less than that D2 separating said center and an apex 2 of the core.
- 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 Y-Y, 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 frame may have a polygonal section with sides defining n faces each having, or some of them, ribs similar to those 4.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Forging (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Road Signs Or Road Markings (AREA)
- Wire Processing (AREA)
- Crushing And Pulverization Processes (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
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.Because of their method of production, when hot, 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 sectioning, 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 a 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 bending force.
On a constaté aussi que le relief des nervures était très atténué après drèssage. Ceci s'explique par le fait que, chaque série de nervures s'étendant sur environ 180°, 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 testing. 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 the so-called "rotating frame" straightening machines.
Par le document FR-A-1 564 544 on connaît une armature comportantune âme de section cruciforme dont les ailes sont réunies' par des nervures obliques, l'ensemble s'inscrivant sensiblement dans un carre.Document FR-A-1 564 544 discloses an armature comprising a cruciform cross-section whose wings are joined 'by oblique ribs, the whole being substantially inscribed in a square.
Une telle armature présente des variations très importantes de sa section qui va engendrer des efforts de torsion lors du dressage.Such a frame has very large variations in its section which will generate torsional forces during dressing.
Par le document FR-A- 2 031 405, on connaît une armature comportantune âme à section polygonale convexe et comportant des nervures obliques, l'ensemble s'inscrivant dans un cercle et étant obtenu, par façonnage à froid, d'une tige ronde.Document FR-A- 2,031,405 discloses an armature comprising a core with a convex polygonal section and comprising oblique ribs, the whole being inscribed in a circle and being obtained, by cold forming, of a round rod .
Lors du dressage d'une telle armature, les galets vont aplatir les nervures.When dressing such a frame, the rollers will flatten the ribs.
La présente invention, qui remédie à ces inconvénients, concerne une armature du genre de celles présentant une âme ayant une section polygonale convexe 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 et le centre de l'âme est légèrement inférieure à celle séparant ledit centre et lesdits sommets tronqués.The present invention, which overcomes these drawbacks, relates to a reinforcement of the kind of those having a core having a convex polygonal section whose vertices are slightly truncated, comprising on its slightly curved faces, oblique ribs and whose section is substantially in a circle, characterized in that the distance separating the most domed part of the ribs and the center of the core is slightly less than that separating said center and said truncated vertices.
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: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:
La figure 1 est une vue en élévation d'une armature conforme à l'invention;Figure 1 is an elevational view of a frame according to the invention;
Les figures 2, 3 et 4 sont des sections effectuées par des plans passant respectivement par les lignes II-II, lll-lll et IV-IV de la figure 1.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 1, 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-X, 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 armature has a central core 1, the cross section of which takes the form of a square, the
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
Selon l'invention, la distance D1 séparant le centre C de l'armature et le sommet de la nevure 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.According to the invention, the distance D1 separating the center C of the frame and the apex of the nevure is slightly less than that D2 separating said center and an
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-Y, 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 Y-Y, 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.
Les faces de l'âme sont légèrement bombées.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'incrivent 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 toute variantes de formes et dimension prévues par le cadre des revendications.Of course, the present invention is not limited to the embodiment described and shown but extends, on the contrary, to any variant shape and dimension provided by the scope of the claims.
C'est ainsi, entre autres, que le barre de l'armature peut présenter une section polygonale à côtés définissant n faces présentant chacune, ou certaine d'entre elles, des nervures analogues à celles 4.Among other things, this is how the the frame may have a polygonal section with sides defining n faces each having, or some of them, ribs similar to those 4.
Claims (3)
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 EP0187075A1 (en) | 1986-07-09 |
| EP0187075B1 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HU204452B (en) * | 1989-12-07 | 1992-01-28 | December 4 Drotmuevek | Steel wire for reinforcing embedding material first for reinforcing concrete and method for producing such steel wire |
| DE102013208413B4 (en) | 2013-05-07 | 2019-10-10 | Badische Stahlwerke Gmbh | Reinforcing steel, production method for reinforcing steel |
| 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 |
Family Cites Families (6)
| 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 | ||
| DE1907129A1 (en) * | 1969-02-13 | 1970-09-03 | Hochwald Drahtwerk Gmbh | Reinforcing bar with ribs on its periphery that are produced in the cold forming process and run obliquely to the longitudinal axis |
| JPS5222623B2 (en) * | 1972-10-17 | 1977-06-18 | ||
| CH651616A5 (en) * | 1981-06-04 | 1985-09-30 | Moos Stahl Ag | Reinforcing bar for reinforced concrete |
| AT376469B (en) * | 1982-11-29 | 1984-11-26 | Hufnagl Walter | METHOD FOR PRODUCING RIBBED REINFORCEMENT STEEL |
-
1984
- 1984-12-07 FR FR8418705A patent/FR2574453B1/en not_active Expired
-
1985
- 1985-11-26 ZA ZA859048A patent/ZA859048B/en unknown
- 1985-11-27 PT PT81562A patent/PT81562B/en not_active IP Right Cessation
- 1985-11-27 AU AU50422/85A patent/AU573927B2/en not_active Ceased
- 1985-11-29 AT AT85402355T patent/ATE35836T1/en not_active IP Right Cessation
- 1985-11-29 EP EP85402355A patent/EP0187075B1/en not_active Expired
- 1985-11-29 DE DE8585402355T patent/DE3563864D1/en not_active Expired
- 1985-12-04 ES ES1985295972U patent/ES295972Y/en not_active Expired
- 1985-12-04 GR GR852916A patent/GR852916B/el unknown
- 1985-12-05 BR BR8506091A patent/BR8506091A/en not_active IP Right Cessation
- 1985-12-06 DK DK565685A patent/DK168830B1/en not_active IP Right Cessation
- 1985-12-06 JP JP60274870A patent/JPS61191752A/en active Pending
-
1988
- 1988-11-23 SG SG786/88A patent/SG78688G/en unknown
-
1989
- 1989-09-28 HK HK775/89A patent/HK77589A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GR852916B (en) | 1986-04-07 |
| EP0187075A1 (en) | 1986-07-09 |
| DK565685D0 (en) | 1985-12-06 |
| ES295972U (en) | 1987-06-16 |
| BR8506091A (en) | 1986-08-19 |
| ZA859048B (en) | 1986-11-26 |
| PT81562B (en) | 1987-09-18 |
| FR2574453A1 (en) | 1986-06-13 |
| DE3563864D1 (en) | 1988-08-25 |
| FR2574453B1 (en) | 1987-12-18 |
| JPS61191752A (en) | 1986-08-26 |
| AU5042285A (en) | 1986-06-12 |
| ES295972Y (en) | 1988-10-01 |
| ATE35836T1 (en) | 1988-08-15 |
| DK168830B1 (en) | 1994-06-20 |
| PT81562A (en) | 1985-12-01 |
| AU573927B2 (en) | 1988-06-23 |
| SG78688G (en) | 1989-09-01 |
| HK77589A (en) | 1989-10-06 |
| DK565685A (en) | 1986-06-08 |
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