EP0306887B1 - Barre d'armature pour béton laminée à chaud, en particulier barre nervurée pour béton - Google Patents

Barre d'armature pour béton laminée à chaud, en particulier barre nervurée pour béton Download PDF

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Publication number
EP0306887B1
EP0306887B1 EP88114479A EP88114479A EP0306887B1 EP 0306887 B1 EP0306887 B1 EP 0306887B1 EP 88114479 A EP88114479 A EP 88114479A EP 88114479 A EP88114479 A EP 88114479A EP 0306887 B1 EP0306887 B1 EP 0306887B1
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EP
European Patent Office
Prior art keywords
rib
concrete reinforcing
reinforcing bar
ribs
angle
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 - Lifetime
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EP88114479A
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German (de)
English (en)
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EP0306887A1 (fr
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.)
Walter Bau AG
Arcelor Luxembourg SA
Original Assignee
Dyckerhoff and Widmann AG
Arbed SA
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Application filed by Dyckerhoff and Widmann AG, Arbed SA filed Critical Dyckerhoff and Widmann AG
Priority to AT88114479T priority Critical patent/ATE64166T1/de
Publication of EP0306887A1 publication Critical patent/EP0306887A1/fr
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Publication of EP0306887B1 publication Critical patent/EP0306887B1/fr
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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
    • 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
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165—Coaxial connection by means of sleeves

Definitions

  • the invention relates to a hot-rolled concrete reinforcement bar, in particular a concrete ribbed bar according to the preamble of claim 1.
  • Concrete reinforcement bars of this type are described for example in concrete and reinforced concrete construction 2/1973, pages 25 to 35.
  • the ribs are assigned a double task. On the one hand, they must ensure a sufficient bond in the concrete and, on the other hand, in their function as parts of a thread, they must be able to transmit the required forces into an anchoring or connecting body into which one end of the concrete reinforcement bar is screwed.
  • These concrete reinforcement bars have, based on the bar diameter, relatively wide ribs at a relatively short distance.
  • the ratio of the base width to the height of the rib is approximately 3.7 and the rib spacing, measured in the longitudinal direction of the reinforcing steel, is 0.5 in relation to the nominal diameter. This corresponds to an angle of inclination ⁇ of the ribs with respect to the longitudinal axis of the concrete reinforcement bar of approximately 81.5 °.
  • the ribs are made much slimmer and have a smaller angle of inclination ⁇ with respect to the longitudinal axis of the reinforcing steel than in the case of the known screwable concrete reinforcing bar.
  • Concrete reinforcement bars made from such steels with the shape and arrangement of the ribs according to the invention are also distinguished by improved ductility.
  • the ductility of a concrete reinforcement bar is determined by the uniform expansion, the ratio of tensile strength to yield strength and the bond.
  • a uniform expansion ⁇ 6%, a ratio of tensile strength to yield strength of ⁇ 1.1 and a sufficient, soft or mild bond supported by the surface roughness of the bar can be achieved.
  • the related rib surface is also reduced.
  • This can be counteracted by extending the ribs so that they each extend almost over half the full circumference of the rod and / or that the ribs are arranged along a two-start helix.
  • These two measures also have an effect in terms of increasing the shear area per unit length, that is to say the resilience of the threaded connection.
  • the reduction in the related rib area can also be counteracted by the fact that additional ribs or between the ribs Incisions are arranged.
  • At least the additional ribs which have a position lying outside the helical line of the thread or are widened, must have a rib height which is reduced to such an extent that the screwing on of the associated anchoring or connecting body is not hindered by them.
  • the diameter of the cylindrical envelope of the additional ribs must therefore be smaller than the inside diameter of the thread of the anchoring or connecting body to be screwed onto the concrete reinforcement bar.
  • the hot-rolled concrete reinforcement bar 1 shown in Figures 1 to 3 has a circular core cross-section 2, shown hatched in Fig. 2, and two mutually opposite rows of ribs 3 and 4 arranged along a helical line, the parts of a thread for screwing one with a counter thread provided anchoring or connecting body.
  • the ribs 3 and 4 formed in the same way are also referred to below as threaded ribs. As shown in FIG. 2, they extend at full height almost over half the rod circumference.
  • the shear area per unit length that determines the load-bearing capacity of the threaded connection is determined by the base width b, the length and the distance C or the angle of inclination ⁇ of the ribs.
  • the base width b of the rib is reduced.
  • the resulting reduction in the shear area is partly due to an increase in the length of the ribs and also by increasing the strength of the concrete reinforcement bar in the area of Edge zone, i.e. in the rib area, compensated.
  • the increased strength in the area of the ribs is achieved in that the hot-rolled steel is so intensively cooled by a water cooling section as it emerges from the last rolling stand in the edge zone that there is a hardness structure in this zone and that the hardened edge zone emerges after the steel emerges the water cooling section is started by the heat content of the core zone.
  • a concrete reinforcement bar produced in this way is also characterized by an increased coefficient of friction due to the scale formation in the edge and rib area, which is desirable with regard to self-locking of the thread.
  • the reinforcing steel according to the invention is characterized by an increased dynamic load capacity, so that it can also be used with the usual anchoring or connecting bodies for dynamically stressed components.
  • the concrete reinforcement bar shown in Fig. 4 differs from the concrete reinforcement bar shown in Figures 1 to 3 in that 3 additional ribs 6 are arranged between the threaded ribs and 4 incisions 7 between the threaded ribs. These measures serve to improve the bond between the concrete reinforcing bar and the concrete . They may be necessary if, with a reduced angle of inclination ⁇ of the threaded ribs, that is to say with an increased pitch of the thread, the distance C between the threaded ribs exceeds a certain dimension and the related rib surface thus becomes too small.
  • Additional ribs 6 have a position lying outside of such a helical line, they must have a rib height that is so far reduced compared to the threaded ribs 3 or 4 that the screwing of the associated anchoring or connecting body is not hindered by the additional ribs.
  • the diameter D of the cylindrical envelope of the additional ribs 6 must therefore be smaller than the inside diameter of the thread of the anchoring or connecting body to be screwed onto the concrete reinforcement bar.
  • projections with a shape that differs from a rib shape, such as knobs can also be provided.
  • the concrete reinforcement bar according to FIG. 4 also shows impressions or incisions 7 for the purpose of illustrating two basic options. Only additional ribs or only incisions can be provided at any point between threaded ribs 3 and / or 4. This also creates the possibility of identifying the screwable concrete reinforcement bar with regard to the type of steel or delivery plant by the arrangement of the ribs or cuts.
  • the rib arrangement shown in FIG. 4 characterizes the steel grade Fe B 500 in accordance with Euronorm 80-85.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Heat Treatment Of Steel (AREA)
  • Laminated Bodies (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (17)

1. Barre d'armature (1) pour béton laminée à chaud, notamment barre nervurée pour béton ayant une section transversale circulaire ou presque circulaire de l'âme (2) et deux rangées mutuellement opposées de nervures (3, 4) disposées le long d'une hélice et ayant une section transversale sensiblement trapézoïdale qui forme des parties d'un filetage destiné au vissage d'un corps d'ancrage ou d'un corps de liaison muni d'un taraudage conjugué qui présente, avec les définitions
b =   largeur de pied de la nervure
ds =   diamètre nominal de l'acier pour béton
h =   hauteur de la nervure
r =   rayon de l'arrondi au pied de la nervure en mm
α =   angle d'inclinaison de la nervure par rapport à l'axe longitudinal de l'acier pour béton en degrés
β =   angle d'inclinaison du flanc de la nervure en degrés une forme et une configuration de nervures qui satisfait aux conditions suivantes
40°  <  β  <  60°
Figure imgb0039
 1,0  <  R  <  3,0
Figure imgb0040
caractérisée en ce que 0,04  ≦  h/ds  ≦  0,06
Figure imgb0041
 1,5  ≦  b/h  ≦  3,3
Figure imgb0042
 60°  <  α  <  80°
Figure imgb0043
et par augmentation de la rugosité superficielle des entailles prévues pour les nervures (3, 4) dans les cylindres de nervurage, le coefficient de friction de la barre d'armature pour béton est augmenté dans la zone des nervures.
2. Barre d'armature pour béton suivant la revendication 1, caractérisée en ce que la rugosité superficielle est augmentée par sablage du canal de laminage des cylindres de nervurage.
3. Barre d'armature (1) pour béton laminée à chaud, notamment barre nervurée pour béton ayant une section transversale circulaire ou presque circulaire de l'âme (2) et deux rangées mutuellement opposées de nervures (3, 4) disposées le long d'une hélice et ayant une section transversale sensiblement trapézoïdale qui forme des parties d'un filetage destiné au vissage d'un corps d'ancrage ou d'un corps de liaison muni d'un taraudage conjugué qui présente, avec les définitions
b =   largeur de pied de la nervure
ds =   diamètre nominal de l'acier pour béton
h =   hauteur de la nervure
r =   rayon de l'arrondi au pied de la nervure en mm
α =   angle d'inclinaison de la nervure par rapport à l'axe longitudinal de l'acier pour béton en degrés
β =   angle d'inclinaison du flanc de la nervure en degrés une forme et une configuration de nervures qui satisfait aux conditions suivantes
40°  <  β  <  60°
Figure imgb0044
 1,0  <  R  <  3,0
Figure imgb0045
caractérisée en ce que 0,04  ≦  h/ds  ≦  0,06
Figure imgb0046
 1,5  ≦  b/h  ≦  3,3
Figure imgb0047
 60°  <  α  <  80°
Figure imgb0048
et par formation de calamine au moyen d'un traitement de trempe et de revenu par la chaleur de laminage, le coefficient de friction de la barre d'armature pour béton est augmenté dans la zone des nervures par rapport à l'état brut de laminage.
4. Barre d'armature (1), laminée à chaud pour béton, notamment barre nevurée pour béton ayant une section transversale circulaire ou presque circulaire de l'âme (2) et deux rangées mutuellement opposées de nervures (3, 4) disposées le long d'une hélice et ayant une section transversale sensiblement trapézoïdale qui forme des parties d'un filetage destiné au vissage d'un coqs d'ancrage ou d'un corps de liaison muni d'un taraudage conjugué qui présente, avec les définitions
b =   largeur de pied de la nervure
ds =   diamètre nominal de l'acier pour béton
h =   hauteur de la nervure
r =   rayon de l'arrondi au pied de la nervure en mm
α =   angle d'inclinaison de la nervure par rapport à l'axe longitudinal de l'acier pour béton en degrés
β =   angle d'inclinaison du flanc de la nervure en degrés une forme et une configuration de nervures qui satisfait aux conditions suivantes
40°  <  β  <  60°
Figure imgb0049
 1,0  <  R  <  3,0
Figure imgb0050
 caractérisée en ce que 0,04  ≦  h/ds  ≦  0,06
Figure imgb0051
 1,5  ≦  b/h  ≦  3,3
Figure imgb0052
 60°  <  α  <  80°
Figure imgb0053
et par un traitement mécanique et/ou chimique, le coefficient de frottement de la barre d'armature pour béton est augmenté dans la zone des nervures par rapport à l'état brut de laminage.
5. Barre d'armature pour béton suivant la revendication 4, caractérisée en ce que le coefficient de friction est augmenté par sablage.
6. Barre d'armature pour béton suivant la revendication 4 ou 5, caractérisée en ce que le coefficient de friction est augmenté par un traitement de corrosion.
7. Barre d'armature pour béton suivant l'une des revendications 1 à 6, caractérisée en ce qu'il possède, dans la zone des nervures, un coefficient de friction assurant l'autoblocage.
8. Barre d'armature pour béton suivant l'une des revendications 1 à 7, caractérisée en ce qu'il possède dans la zone marginale et dans la zone des nervures, une résistance plus grande que celle de l'âme.
9. Barre d'armature pour béton suivant l'une des revendications 1 à 8, caractérisée en ce que les nervures (3, 4) sont disposées le long d'une hélice à deux pas.
10. Barre d'armature pour béton suivant l'une des revendications 1 à 9, caractérisée en ce que l'intervalle C entre les nervures (3 et 4), mesuré suivant la direction longitudinale de la barre d'armature, satisfait à la condition 0,38  ≦  C/ds  ≦  0,60.
Figure imgb0054
11. Barre d'armature pour béton suivant l'une des revendications 1 à 10, caractérisée en ce que les nervures (3, 4) s'étendent sur toute leur hauteur chacune, presque sur la moitié du pourtour de la barre.
12. Barre d'armature pour béton suivant l'une des revendications 1 à 11, caractérisée en ce qu'elle présente un allongement avant striction Ag  ≧  6%.
13. Barre d'armature pour béton suivant l'une des revendications 1 à 12, caractérisée en ce qu'entre les nervures (3) sont prévues des parties saillantes ou des nervures supplémentaires (6) parmi lesquelles au moins celles qui se trouvent à l'extérieur de l'hélice à un pas ou à plusieurs pas ou qui sont élargies, ont une hauteur si diminuée que le vissage du corps d'ancrage ou de liaison associé n'est pas gêné par les nervures supplémentaires.
14. Barre d'armature pour béton suivant l'une des revendications 1 à 13, caractérisée en ce qu'il est prévu entre les nervures (3, 6) des empreintes ou des entailles (7).
15. Barre d'armature pour béton suivant l'une des revendications 1 à 14, caractérisée en ce que le rapport b/h des nervures satisfait à la condition 2,0  ≦  b/h  ≦  3, 0.
16. Barre d'armature pour béton suivant la revendication 8 en liaison avec la revendication 3, caractérisée en ce que l'acier a une teneur de 0,10  ≦  C  ≦  0,27
Figure imgb0055
 0,40  ≦  Mn  ≦  0,80
Figure imgb0056
 Cu  ≦  0,80.
Figure imgb0057
17. Procédé de fabrication d'une barre d'armature pour béton suivant l'une des revendications 1 à 16, caractérisé en ce qu'il consiste à en refroidir la zone marginale après qu'elle a quitté la dernière cage de laminoir d'une installation de laminage à chaud, dans une zone de refroidissement par de l'eau d'une manière si intense qu'il se forme dans cette zone de la martensite et/ou de la bainite et après la sortie de la barre de la zone de refroidissement par de l'eau, à faire subir à la zone marginale trempée un revenu par la capacité calorifique de la zone d'âme.
EP88114479A 1987-09-11 1988-09-05 Barre d'armature pour béton laminée à chaud, en particulier barre nervurée pour béton Expired - Lifetime EP0306887B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88114479T ATE64166T1 (de) 1987-09-11 1988-09-05 Warmgewalzter betonbewehrungsstab, insbesondere betonrippenstab.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3730490 1987-09-11
DE19873730490 DE3730490A1 (de) 1987-09-11 1987-09-11 Warmgewalzter betonbewehrungsstab, insbesondere betonrippenstab

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EP0306887A1 EP0306887A1 (fr) 1989-03-15
EP0306887B1 true EP0306887B1 (fr) 1991-06-05

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US (1) US4922681A (fr)
EP (1) EP0306887B1 (fr)
JP (1) JPH0635739B2 (fr)
AT (1) ATE64166T1 (fr)
AU (1) AU595468B2 (fr)
BR (1) BR8804697A (fr)
CA (1) CA1306118C (fr)
DE (3) DE8717648U1 (fr)
ES (1) ES2022561B3 (fr)
NO (1) NO883998L (fr)
ZA (1) ZA886357B (fr)

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DE3431008C2 (de) * 1984-08-23 1986-10-16 Dyckerhoff & Widmann AG, 8000 München Wärmebehandlung von warmgewalzten Stäben oder Drähten
DE3444583A1 (de) * 1984-12-06 1986-06-19 Montanhandel Peter Richter, 4000 Düsseldorf Rundstab mit aussengewinde
DE3517638A1 (de) * 1985-05-15 1986-11-20 Ulrich Dr.Ing. e.h. Dr.Ing. 8000 München Finsterwalder Gewindestab
DE3518606A1 (de) * 1985-05-23 1986-11-27 Pantex-Stahl AG, Büron Bewehrungsstahl insbesondere fuer spritzbeton
EP0232245A3 (en) * 1986-01-30 1990-01-31 Voest-Alpine Aktiengesellschaft Concrete reinforcing steel
DD250972A1 (de) * 1986-07-14 1987-10-28 Brandenburg Stahl Walzwerk Profilierter betonbewehrungsstab

Also Published As

Publication number Publication date
NO883998D0 (no) 1988-09-08
CA1306118C (fr) 1992-08-11
DE8717648U1 (fr) 1989-09-28
DE3863149D1 (de) 1991-07-11
ATE64166T1 (de) 1991-06-15
JPH01158156A (ja) 1989-06-21
NO883998L (no) 1989-03-13
DE3730490A1 (de) 1989-03-23
BR8804697A (pt) 1989-04-18
EP0306887A1 (fr) 1989-03-15
JPH0635739B2 (ja) 1994-05-11
US4922681A (en) 1990-05-08
ES2022561B3 (es) 1991-12-01
AU595468B2 (en) 1990-03-29
ZA886357B (en) 1989-05-30
AU2204788A (en) 1989-04-13

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