EP1231331B1 - Acier à béton nervuré et béton armé - Google Patents

Acier à béton nervuré et béton armé Download PDF

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Publication number
EP1231331B1
EP1231331B1 EP02002017A EP02002017A EP1231331B1 EP 1231331 B1 EP1231331 B1 EP 1231331B1 EP 02002017 A EP02002017 A EP 02002017A EP 02002017 A EP02002017 A EP 02002017A EP 1231331 B1 EP1231331 B1 EP 1231331B1
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EP
European Patent Office
Prior art keywords
reinforcing steel
rib
ribs
concrete reinforcing
concrete
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
Application number
EP02002017A
Other languages
German (de)
English (en)
Other versions
EP1231331A2 (fr
EP1231331A3 (fr
Inventor
Jürgen Schulz
Richard Langenecker
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.)
Badische Stahlwerke AG
Original Assignee
Badische Stahlwerke AG
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Filing date
Publication date
Application filed by Badische Stahlwerke AG filed Critical Badische Stahlwerke AG
Publication of EP1231331A2 publication Critical patent/EP1231331A2/fr
Publication of EP1231331A3 publication Critical patent/EP1231331A3/fr
Application granted granted Critical
Publication of EP1231331B1 publication Critical patent/EP1231331B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 rod-shaped reinforcing steel with ribs.
  • the present invention finds application wherever reinforcing bars are used to produce reinforced concrete.
  • the present invention is used in particular in the production of reinforced concrete, in particular here in the production of welded steel mesh and reinforcing steel, preferably in rings application.
  • a rod-shaped reinforcing steel according to the preamble of claim 1 is known from FR-A-0399910.
  • reinforcing mats In reinforcing mats, several reinforcing bars are cross-stacked and welded at their points of contact. Usually, cold-rolled reinforcing steel is used for this reinforcing steel. Furthermore, reinforcing steel is often wound on spools, so-called “rings", and transported on to the customer. For further processing of this reinforcing steel, this is fed to a straightening or bending and cutting machine, or for example a mat machine, to produce welded meshes. The reinforcing steel is straightened in so-called roller straightening sets or alternatively in rotor straightening sets. For a higher quality rebar, hot rolled reinforcing steel is increasingly being used.
  • the rib geometries prescribed in the corresponding reinforcing steel standards result in relatively pronounced ribs.
  • the directed rods tend when they are fed via a rod magazine for further processing, as often customary, when singulating or pulling out of the magazine to hook each other.
  • the angle of inclination ⁇ of the ribs present on the surface is usually about 60 °. This geometric arrangement of the ribs affects the bonding behavior of the reinforcing steel in the reinforced concrete.
  • reinforcing bars without ribs are not possible in most applications, as the ribs play an important role in composite behavior, as these ribs direct the forces from the concrete into the reinforcing steel.
  • FIGS. 1a to 1d show prior art reinforcing bars as described in DIN 488 or in building inspectorate approvals.
  • the reinforcing steel 1 has in the present embodiment, four rows of (in the drawing from top to bottom) ribs 2.
  • the rib inclination angle ⁇ between the longitudinal direction of the considered rib and the direction of the longitudinal axis A of the reinforcing steel is approximately 60 ° in the case of prior art reinforcing bars.
  • the distance between two ribs 2 in the longitudinal direction (rib distance) is c
  • the rib head width of a rib 2 transverse to the longitudinal direction of the considered rib is denoted by b.
  • Fig. 1d shows a section through the reinforcing steel 1 along the section line D shown in Fig. 1b.
  • FIG. 1c is the rib head surface
  • 2b designates the rib flank (on the other side of the fin head surface 2a is also a rib flank not visible in the drawing)
  • 8 is the sink between two adjacent ribs 2.
  • the approximately circular contour is created by the backdrops appearing one behind the other and thus the circumferential contour forming ribs 2.
  • the sectional contour 4 itself appears rather irregular. However, it quite regularly arises in the production of reinforcing steel.
  • the approximately square basic shape 5 with optionally rounded edges and the ribs 2 are rolled by rolling into the raw material. This can be hot rolling or cold rolling.
  • the overall structure in cross-sectional area can thus be thought of as ribs 2, which rest on a basic body with a square cross section (reference numeral 5).
  • the actual cross-sectional contour 4 results depending on where the cross section intersects the respective ribs.
  • the rows of ribs are formed by webs 6 extending in the longitudinal direction of the material (fin row spacing or rolling gap) and, depending on the basic shape (eg round, square, hexagonal, etc.) and the rib penetration depth, e.g. T. separated by further webs 7 ..
  • Fig. 2a the composite behavior of concrete steel is outlined in concrete.
  • the composite behavior indicates with which force F the reinforcing steel has to be pulled so that there is a displacement ⁇ 1 of the reinforcing steel in the concrete.
  • the bond stress is displayed via the pull-out path.
  • the composite voltage reaches a maximum.
  • the force decreases again, since the composite of the reinforcing steel is weakened by shearing the concrete base between the ribs.
  • FIG. 2b shows the expansion behavior of reinforcing steel.
  • the reinforcing steel expands in a first linear range, the elastic range, in proportion to the applied force F up to a yield strength F s . Subsequently, the reinforcing steel deforms plastically. This deformation is not reversible. Furthermore, a fatigue test is shown in which the reinforcing steel is subjected to a periodically changing force which is less than F s . Although the applied force is so small that it does not yet come to a plastic deformation, such a load can lead to a fatigue fracture of the reinforcing steel.
  • An object of the present invention is to provide a reinforcing steel which can be used in mat machines or straightening and ironing machines, without causing problems during processing on the machine.
  • the rib inclination angle ⁇ to the longitudinal axis of the reinforcing steel may be 25 to 55 °, preferably 35 to 45 °, more preferably 37 to 42 °.
  • This small rib inclination angle ⁇ relative to the reinforcing steel axis has several advantages: Studies have shown that in a Such a low rib inclination angle substantially improved fatigue properties can be achieved, ie a fatigue fracture of the reinforcing steel occurs less often or only after a longer time than in conventional reinforcing steel with a greater rib inclination angle. There are less pronounced edges in the longitudinal direction of the reinforcing steel in the reinforcing bar according to the invention with reduced rib inclination angle.
  • the rib inclination angle is substantially the same for all ribs of the reinforcing steel. This achieves the above advantages over the entire length of the reinforcing steel.
  • the rib head width b of the ribs is greater than 0.2 times, preferably less than 0.5 times the nominal diameter, and more preferably 0.3 to 0.4 times the nominal diameter. This results in an improved rib filling in the rolling process, which leads to a lower ovality or uniform roundness of the outer diameter of the reinforcing steel. As a result, the reinforcing steel can be better processed. In the case of possibly round reinforcing steels, i. with the least possible ovality, the steel rests more uniformly on the roll. If the rod is guided, for example, between two opposing rollers, then the play between the rollers with rods that are as round as possible does not depend on the position of the rod. A rotation of the preferably rod-shaped reinforcing steel about its own longitudinal axis does not change this game if the rod is round and not oval. In addition, the force parameters are then more uniform.
  • the ratio of the rib width in the longitudinal direction b 'to the rib distance c in the direction of the reinforcing steel axis may be greater than 0.35, preferably greater than 0.4, more preferably greater than 0.45. This also leads to a more uniform distribution on the enveloping in bar direction, which has the above advantages.
  • This ratio of the rib width in the longitudinal direction to the rib spacing is also suitable for use in high-strength concrete or for use in self-compacting concrete (SVB, slump according to ASTM at least 60 cm, preferably at least 65 cm, more preferably at least 70 cm).
  • the reinforcing steel is produced by hot rolling.
  • the preferably rod-shaped, but often also supplied as a coil reinforcing steel may have a plurality of rows of ribs, preferably 4. However, it may also be provided 2, 3 or 6 rows of ribs.
  • the fin coverage is greater than 50%, preferably greater than 55%.
  • the minimum value of the related rib area is preferably in the range between 30% below and 30% above the minimum value prescribed in DIN 488. This is especially true for reinforcing bars with a nominal diameter greater than or equal to 4 mm.
  • the rib inclination angle ⁇ is between 25 ° and 55 ° and preferably about 40 ° +/- 5%.
  • the rib head width b is greater than 0.2 times, and preferably less than 0.5 times the diameter.
  • the diameter is the nominal diameter (i.e., the diameter of a monoblock rod of uniform cross section).
  • the fin head width b is larger than in the case of reinforcing steel according to the prior art.
  • the ratio of the rib width in the longitudinal direction b 'to the rib spacing c is greater than 0.35, which is not the case with prior art reinforcing steel. There, this ratio is less than 0.35.
  • the rebar according to the invention is shown with four rows of ribs. It may as well be another number of rows of ribs are used.
  • the rows of ribs preferably extend in the longitudinal direction of the reinforcing steel. In Fig. 3b, two of them are indicated by the reference numerals 9 and 10.
  • the rows of ribs are each bounded by webs 6 and optionally 7.
  • reinforcing steels with a related rib area f R less than 130% of the minimum value provided for in DIN 488 appear to be advantageous.
  • the referenced fin area is less than 115%, more preferably less than 100%.
  • a reinforced concrete With a reinforcing steel as described above, a reinforced concrete can be produced.
  • the reinforced concrete then has a concrete and the reinforcing steel described above.
  • the concrete preferably has a strength greater than 55 N / mm 2 .
  • Fig. 4 shows a sketch for determining the degree of rib coverage, where c is the rib distance, b is the rib head width and 1 is the rib length.
  • the degree of rib coverage is, as can be clearly said, the proportion of the hatched area A on the envelope in relation to the total envelope of the reinforcing steel, with the areas of bars 6 and possibly 7 being included.
  • the required rib coverage has the advantage that the smoothness and the Richtonia the reinforced concrete improve. Also, the risk of entanglement during processing is lower, and the weldability is better due to the larger contact surfaces.
  • Typical diameter rod-shaped material of the reinforcing steel are a minimum of 4 mm, a maximum of 65 mm, preferably a minimum of 6 mm, a maximum of 32 mm.
  • Typical lengths of rod-shaped material are a minimum of 2 m, a maximum of 30 m, preferably a minimum of 6 m, a maximum of 24 m.
  • Typical diameters of rings of reinforcing steel are a minimum of 0.5 m, a maximum of 2 m, preferably a minimum of 0.7 m, a maximum of 1.8 m.
  • the reinforcing steel may also be mat-shaped. Here then rods that are formed as above, connected to each other in a grid, preferably welded.
  • the reinforcing steel may also be used as a prefabricated reinforcement, e.g. B. be designed as a lattice girder, reinforcing cage or reinforcing bar or rod in fixed length.

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  • 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)

Claims (7)

  1. Acier à béton en forme de barre, également utilisable en bobines, avec des nervures (2) et des âmes (6), les nervures (2) présentant un angle d'inclinaison des nervures (β) par rapport à l'axe longitudinal de l'acier à béton, et les âmes (6) s'étendent dans le sens longitudinal de l'acier à béton (1), une largeur de sommet de nervure b des nervures (2) étant supérieure à 0,2 fois le diamètre nominal de l'acier à béton (1), caractérisé en ce que l'acier à béton est laminé à chaud, et en ce que le taux de couverture des nervures sur l'enveloppe est supérieur à 50 %, le taux de couverture des nervures étant la grandeur relative pour la surface occupée sur l'enveloppe par les sommets (2a) des nervures et par les âmes (6), l'enveloppe ayant une section circulaire avec comme diamètre de cercle le diamètre nominal de l'acier à béton.
  2. Acier à béton (1) selon la revendication 1, caractérisé en ce que l'angle d'inclinaison des nervures β par rapport à l'axe longitudinal de l'acier à béton est compris entre 25° et 55°, de préférence entre 35° et 45°, et notamment de préférence entre 37° et 42°.
  3. Acier à béton (1) selon la revendication 1, caractérisé en ce que l'angle d'inclinaison des nervures est sensiblement le même pour toutes les nervures (2).
  4. Acier à béton (1) selon l'une des revendications précédentes, caractérisé en ce que le rapport entre la largeur de nervure dans le sens longitudinal b' et l'intervalle entre les nervures c est supérieur à 0,35 dans le sens de l'axe de l'acier à béton (A).
  5. Acier à béton (1) selon l'une des revendications précédentes, caractérisé en ce qu'il comporte plusieurs rangées de nervures, de préférence quatre.
  6. Acier à béton (1) selon l'une des revendications précédentes, caractérisé en ce que le taux de couverture des nervures est supérieur à 55 %.
  7. Acier à béton (1) selon l'une des revendications précédentes, caractérisé en ce que la surface de nervure spécifique fR est inférieure à 130 % de la valeur minimale prescrite par DIN 488, de préférence inférieure à 115 %, et notamment de préférence inférieure à 100 %.
EP02002017A 2001-02-08 2002-02-06 Acier à béton nervuré et béton armé Expired - Lifetime EP1231331B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10105667 2001-02-08
DE10105667A DE10105667A1 (de) 2001-02-08 2001-02-08 Betonstahl mit Rippen, Stahlbeton

Publications (3)

Publication Number Publication Date
EP1231331A2 EP1231331A2 (fr) 2002-08-14
EP1231331A3 EP1231331A3 (fr) 2002-12-04
EP1231331B1 true EP1231331B1 (fr) 2006-12-20

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Family Applications (1)

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EP02002017A Expired - Lifetime EP1231331B1 (fr) 2001-02-08 2002-02-06 Acier à béton nervuré et béton armé

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EP (1) EP1231331B1 (fr)
AT (1) ATE348923T1 (fr)
DE (2) DE10105667A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10206819A1 (de) * 2002-02-18 2003-08-28 Max Aicher Rohrförmiger gerippter Bewehrungsstahl, Verfahren zum Herstellen eines rohrförmigen gerippten Bewehrungsstahls und Verwendung eines rohrförmigen Bewehrungsstahls
CN101942887A (zh) * 2010-09-09 2011-01-12 天津市建科机械制造有限公司 四面带肋钢筋
CN102102424A (zh) * 2011-03-03 2011-06-22 天津市银龙预应力钢材集团有限公司 一种带有断续螺旋肋的无脊钢筋
RU2680153C2 (ru) * 2016-12-23 2019-02-18 Игорь Николаевич Тихонов Арматурный стержень периодического профиля

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2350441A1 (fr) * 1976-05-07 1977-12-02 Centre Rech Metallurgique Rond a beton en acier avec nervures longitudinales diametralement opposees et des nervures obliques
US4811541A (en) * 1985-05-15 1989-03-14 Ulrich Finsterwalder Threaded bar

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1609638A1 (de) * 1966-01-04 1970-07-30 Filiton Ag Bewehrungsstab fuer den Stahlbetonbau
DE1759485A1 (de) * 1968-05-06 1971-07-08 Schwarz & Meissner Bewehrungst Bewehrungsstab
DE1759969C3 (de) * 1968-06-25 1979-03-29 Baustahlgewebe Gmbh, 4000 Duesseldorf PunktgeschweiBte Bewehrungsmatte
DE1907129A1 (de) * 1969-02-13 1970-09-03 Hochwald Drahtwerk Gmbh Bewehrungsstab mit im Kaltverformungsverfahren hergestellten,schraeg zur Laengsachse verlaufenden Rippen auf seiner Peripherie
DE2123818B2 (de) * 1971-05-13 1979-08-16 Helmut 4224 Huenxe Dickmann Verfahren und Vorrichtung zum Herstellen eines gerippten Betonbewehrungsstabs
DD250972A1 (de) * 1986-07-14 1987-10-28 Brandenburg Stahl Walzwerk Profilierter betonbewehrungsstab
FR2647372A1 (fr) * 1989-05-26 1990-11-30 Acor Const Rationalises Fil d'acier nervure a haute adherence et son procede de fabrication
DE4011486A1 (de) * 1990-04-09 1991-10-10 Inst Stahlbeton Bewehrung Ev Betonrippenstahl mit kaltgewalzten schraegrippen und dessen verwendung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2350441A1 (fr) * 1976-05-07 1977-12-02 Centre Rech Metallurgique Rond a beton en acier avec nervures longitudinales diametralement opposees et des nervures obliques
US4811541A (en) * 1985-05-15 1989-03-14 Ulrich Finsterwalder Threaded bar

Also Published As

Publication number Publication date
ATE348923T1 (de) 2007-01-15
DE50208977D1 (de) 2007-02-01
EP1231331A2 (fr) 2002-08-14
DE10105667A1 (de) 2002-09-26
EP1231331A3 (fr) 2002-12-04

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