EP3004483B1 - Bewehrungsstab mit hoher haftfestigkeit für stahlbeton - Google Patents

Bewehrungsstab mit hoher haftfestigkeit für stahlbeton Download PDF

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Publication number
EP3004483B1
EP3004483B1 EP14729702.2A EP14729702A EP3004483B1 EP 3004483 B1 EP3004483 B1 EP 3004483B1 EP 14729702 A EP14729702 A EP 14729702A EP 3004483 B1 EP3004483 B1 EP 3004483B1
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EP
European Patent Office
Prior art keywords
reinforcing bar
end portion
connection sleeve
upset end
extension
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Active
Application number
EP14729702.2A
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English (en)
French (fr)
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EP3004483A1 (de
Inventor
Richard BOISSON
Philippe Huet
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Magnetude
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Magnetude
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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
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements
    • 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 present invention relates to a high-strength reinforcing bar for reinforced concrete, an assembly comprising such a reinforcing bar, a method of assembling a reinforcement for reinforced concrete and a method of manufacturing a reinforcement for reinforced concrete. .
  • the document CN 1 060 133 discloses a reinforcing bar according to the preamble of claim 1.
  • the embodiment of the thread on a discharged end portion that is to say on a reinforced end portion and having an outside diameter greater than the nominal diameter of the reinforcing bar, makes it possible to limit the risks of rupture of the the reinforcing bar at the thread, and more particularly when the diameter at the bottom of the thread is greater than the diameter rebar, as mentioned in the document FR 2,639,054 .
  • the nominal diameter of a reinforcing bar corresponds to the outside diameter of a theoretical reinforcing bar of constant circular section and having the same linear density as said reinforcing bar.
  • the cold discharge of a large portion of the reinforcing bar causes, on the one hand, a modification of the crystalline structure of said portion, which may cause embrittlement of the reinforcing bar at the level of the portion of the reinforcing bar. end repressed, and therefore a risk of rupture of the rebar at this location, and secondly a remanent deformation of the rebar when it is put in tension.
  • the present invention aims to remedy these disadvantages.
  • the technical problem underlying the invention therefore consists in providing a high-strength reinforcing bar for reinforced concrete which is of simple and economical structure, while ensuring a reliable and easy assembly of a reinforcement for reinforced concrete.
  • Such a configuration of the upset end portion makes it possible to limit the degradations of the crystalline structure of said end portion during the discharge step of the reinforcing bar, and thus to greatly limit the risks of rupture and remanent deformation of the rebar at this location, without requiring an over-size of said rebar.
  • the reinforcing bar according to the invention thus ensures a reliable assembly of a reinforcement for reinforced concrete.
  • the thread extends at least in part over the first and second portions of the end portion.
  • the second part comprises a longitudinal core and attachment asperities formed on the outer surface of said longitudinal core.
  • the longitudinal core of the second portion is of decreasing general section in the direction of the extension portion.
  • the second part extends in the extension of the first part.
  • the second portion extends to the extension portion.
  • the first part extends from the corresponding free end of the reinforcing bar.
  • the second part has a length greater than twice the length of the first part.
  • the second portion of the end-discharge portion has a length greater than or equal to the nominal diameter of the reinforcing bar.
  • the second portion of the end-discharge portion comprises at least a first substantially frustoconical portion having its largest base facing the first portion of the end-end portion, and a second portion substantially frustoconical disposed between the first substantially frustoconical portion and the extension portion, the second substantially frustoconical portion having its largest base facing the first substantially frustoconical portion.
  • the first substantially frustoconical portion has a slope of between 6 and 18%, and preferably between 8 and 16%.
  • the second substantially frustoconical portion has a slope of between 2 and 5%, and preferably between 2.2 and 4.5%.
  • the second substantially frustoconical portion has a length greater than or equal to the length of the first substantially frustoconical portion.
  • the second substantially frustoconical portion extends in the extension of the first substantially frustoconical portion.
  • the second substantially frustoconical portion has a length greater than or equal to the length of the first portion.
  • the longitudinal core of the second portion comprises at least a first substantially frustoconical core portion having its largest base facing the first portion, and a second substantially frustoconical core portion disposed between the first core portion and the extension portion, the second core portion having its largest base facing the first core portion.
  • the second core portion has a length greater than or equal to the length of the first portion.
  • the second core portion has a length greater than or equal to the length of the first core portion.
  • the thread extends at least in part over the first and second core portions.
  • the diameter of the second core portion at its largest base is greater than the nominal diameter of the reinforcing bar.
  • the cross section of the end portion discharged at the thread bottom of the thread is greater than a cross section of the extension portion.
  • the cylinder circumscribing the extension portion and having an axis parallel to the longitudinal axis of the extension portion has a smaller diameter than the bottom thread diameter of the thread.
  • circumscribed cylinder is meant the smaller diameter cylinder including all the points of the extension portion.
  • the projection of the extension portion on a plane orthogonal to the longitudinal axis of the rebar defines a first surface and the projection of the cross section of the end portion discharged at the Thread bottom thread on said plane defines a second surface, the first surface being inscribed in the second surface.
  • the thread extends over a longitudinal length that is less than or equal to the length of the end-pushed portion.
  • the cross section of the end portion discharged at the thread bottom of the thread is greater than each cross section of the extension portion.
  • the threading provided on the upset end portion is cylindrical.
  • the discharged end portion extends in the extension of the extension portion.
  • the discharged end portion has a length of between 0.5 and 1.4 times the nominal diameter of the reinforcing bar.
  • the end portion has a length corresponding to about 0.6 times the nominal diameter of the reinforcing bar (for example when the reinforcing bar is intended for a standard assembly, also called LS bond, that is to say that is, allowing a rotation drive of said reinforcing bar when it is assembled to another connecting bar by means of a connecting sleeve
  • the end-end portion has a length corresponding to about 1.2 times the nominal diameter of the reinforcing bar (for example when said reinforcing bar can not be rotated during its assembly to another connecting bar with the aid of a connecting sleeve, that is to say for example during an LSR link or an LCE link).
  • the attachment asperities comprise at least one longitudinal rib, and preferably two longitudinal ribs substantially diametrically opposed.
  • the attachment asperities comprise a plurality of oblique ribs, also called locks, the oblique ribs having for example a general crescent shape.
  • the extension portion comprises a longitudinal core on the outer surface of which are formed the attachment asperities.
  • the extension portion and the repressed end portion extend substantially coaxially.
  • the present invention further relates to a reinforcement assembly for reinforced concrete, comprising a reinforcing bar according to the invention, and a connecting sleeve comprising a thread arranged to cooperate with the threading provided on the end portion repressed.
  • the discharged end portion has a length greater than or substantially equal to the longitudinal length of the tapping provided on the connecting sleeve.
  • the assembly further comprises a stop nut intended to cooperate with the thread on the one hand provided on the end end portion and on the other hand the connecting sleeve.
  • the stop nut is intended to cooperate with one end of the connecting sleeve.
  • the discharged end portion has a length greater than or substantially equal to the sum of the longitudinal length of the tapping provided on the connecting sleeve and the height of the stop nut.
  • the threading is defined by a diameter / pitch pair that does not comply with the international threading standards, and this in such a way as to define a specific torque as a function of the armature diameters and the diameter. link to achieve.
  • the discharge step is performed cold.
  • the discharge step is carried out at variable speed, for example continuously or in stages.
  • the discharge step is successively carried out according to a first delivery mode defining a first speed range and according to a second delivery mode defining a second speed range, the speeds belonging to the second speed range being less than the second speed range. smaller speeds belonging to the first speed range.
  • the delivery speed is degressive during the first delivery mode.
  • the reinforcing bar 2 comprises an extension portion 3 and a raised end portion 4 extending in the extension of the extension portion 3.
  • the extension portion 3 and the end portion 4 s pushed back extend substantially coaxially.
  • the extension portion 3 comprises a substantially cylindrical longitudinal core 5 and attachment asperities provided on the outer surface of the longitudinal core 5.
  • the attachment asperities comprise two diametrically opposite longitudinal ribs 6, and a plurality of oblique ribs 7, also called locks, arranged between the longitudinal ribs 6.
  • the oblique ribs 7 may for example have a general crescent shape.
  • the pushed end portion 4 has a substantially cylindrical first portion 41 extending from the corresponding free end of the reinforcing bar 2, and a second portion 42 extending the first portion 41.
  • the second portion 42 s extends to the extension portion 3 and has a length greater than or equal to the length of the first portion 41.
  • the second part 42 has a length greater than or equal to the nominal diameter Dn of the reinforcing bar 2.
  • the second portion 42 comprises a first substantially frustoconical portion 42a having its largest base facing the first portion 41 of the end-discharge portion 4, and a second substantially frustoconical portion 42b disposed between the first portion 42a and the portion of extension 3, the second portion 42b having its largest base facing the first portion 42a.
  • the first portion 42a extends in the extension of the first portion 41
  • the second portion 42b extends in the extension of the first portion 42a.
  • the second portion 42b has a length greater than or equal to the length of the first portion 42a, and greater than or equal to the length of the first portion 41.
  • the upset end portion 4 is provided with a cylindrical thread 8 intended to cooperate with a tapping formed in a connecting sleeve, and having a diameter at the bottom of thread Df greater than or equal to the nominal diameter Dn of the bar of frame 2.
  • the cylindrical threading 8 extends only over part of the length of the upset end portion 4.
  • the cylindrical threading 8 extends in part over the first and second portions 42a, 42b of the pushed end portion 4.
  • the discharge step is performed cold and at variable speed, for example continuously or in stages.
  • the discharge step is successively carried out according to a first delivery mode defining a first speed range and according to a second delivery mode defining a second speed range, the speeds belonging to the second speed range being less than the second speed range. smaller speeds belonging to the first speed range.
  • the discharge step consists in forming the second portion 42 'so that it comprises at least a first substantially frustoconical portion 42a' having its largest base facing the first portion 41 ', and a second portion substantially' frustoconical 42b 'disposed between the first portion 42a' and the extension portion 3 ', the second portion 42b' having its largest base facing the first portion 42a '.
  • first portions 41, 41 'and the first and second portions 42a, 42a', 42b, 42b ' have slightly different lengths, respectively, because the thread 8 has a threaded aperture diameter smaller than the outside diameter. of the first part 41 '.
  • a first method of assembling a reinforcement for reinforced concrete is described below with reference mainly to Figures 3 and 4 .
  • the discharged end portion 4 of the second reinforcing bar 2 ' has a length greater than or substantially equal to the longitudinal length of the tapping 13 provided on the connecting sleeve 12.
  • the end portion of the connecting sleeve 12 intended to be turned towards the first reinforcing bar 2 is flared so as to facilitate the insertion of the first reinforcing bar 2 into the connecting sleeve 12.
  • a second method of assembling a reinforcement for reinforced concrete is described below with reference mainly to Figures 5 and 6 .
  • the discharged end portion 4 of the second reinforcing bar 2 ' has a length greater than or substantially equal to the sum of the longitudinal length of the tapping 13 provided on the connecting sleeve 12 and the height of the thrust nut 16.
  • the figure 8 represents a reinforcing bar according to a second embodiment of the invention which differs from that shown on the Figures 1 to 7 essentially in that the cylinder circumscribing the extension portion 3 and having an axis parallel to the longitudinal axis of the extension portion 3 has a diameter smaller than the diameter at the bottom of the thread Df of the cylindrical thread 8.
  • the projection of the extension portion 3 on a plane orthogonal to the longitudinal axis of the reinforcing bar 2 defines a first surface S1 and the projection of the cross section of the discharged end portion 4 at the thread bottom of the cylindrical thread 8 on said plane defines a second surface S2, the first surface S1 being inscribed in the second surface. S2.
  • the cross section of the end-end portion 4 at the bottom of the thread of the cylindrical thread 8 is greater than each cross-section of the extension portion 3, and more precisely at each section of the extension portion 3 orthogonal to the longitudinal axis of the extension portion 3.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Claims (12)

  1. Bewehrungsstab (2) mit starker Haftung für Stahlbeton, umfassend:
    - einen Verlängerungsabschnitt (3), an seiner Außenfläche Verbundunebenheiten (6, 7) umfassend, die dazu bestimmt sind, die Haftung zwischen dem Bewehrungsstab und dem Beton zu fördern;
    - einen gestauchten Abschlussabschnitt (4), der mit einem Gewinde (8) versehen ist, das dazu bestimmt ist, mit einem Innengewinde (12) zusammenzuwirken, dass in einer Verbindungsmuffe (11) vorgesehen ist, wobei der Durchmesser am Gewindekern des Gewindes (8) größer oder gleich ist, als der Nenndurchmesser des Bewehrungsstabs, und der gestauchte Abschlussabschnitt (4) einen ersten im Wesentlichen zylindrischen Teil (41) umfasst, und zumindest einen zweiten Teil (42), der zwischen dem ersten Teil und dem Verlängerungsabschnitt angeordnet ist, wobei der zweite Teil (42) einen allgemeinen Querschnitt aufweist, der in Richtung des Verlängerungsabschnittes abnehmend ist, dadurch gekennzeichnet, dass der zweite Teil (42) eine Länge größer oder gleich der Länge des ersten Teils (41) aufweist.
  2. Bewehrungsstab nach Anspruch 1, wobei der zweite Teil (42) des gestauchten Abschlussabschnitts (4) eine Länge größer oder gleich dem Nenndurchmesser des Bewehrungsstabs aufweist.
  3. Bewehrungsstab nach Anspruch 1 oder 2, wobei der zweite Teil (42) des gestauchten Abschlussabschnitts (4) zumindest einen ersten im Wesentlichen kegelstumpfförmigen Abschnitt umfasst, dessen größere Basis zum ersten Teil (41) des gestauchten Abschlussabschnitts (4) hin gerichtet ist, und einen zweiten im Wesentlichen kegelstumpfförmigen Abschnitt, der zwischen dem ersten im Wesentlichen kegelstumpfförmigen Abschnitt und dem Verlängerungsabschnitt angeordnet ist, wobei die größere Basis des zweiten im Wesentlichen kegelstumpfförmigen Abschnitts zum ersten im Wesentlichen kegelstumpfförmigen Abschnitt hin gerichtet ist.
  4. Bewehrungsstab nach Anspruch 3, wobei der zweite im Wesentlichen kegelstumpfförmige Abschnitt eine Länge größer oder gleich der Länge des ersten im Wesentlichen kegelstumpfförmigen Abschnitts aufweist.
  5. Einheit zur Bewehrung für Stahlbeton, einen Bewehrungsstab (2) nach einem der Ansprüche 1 bis 4 umfassend, und eine Verbindungsmuffe (11), ein Innengewinde (12) umfassend, angeordnet, um mit dem Gewinde (8) zusammenzuwirken, das am gestauchten Abschlussabschnitt (4) vorgesehen ist.
  6. Einheit nach Anspruch 5, wobei der gestauchte Abschlussabschnitt (4) eine Länge größer oder im Wesentlichen gleich der Länge in der Längsrichtung des Innengewindes (12) aufweist, das an der Verbindungsmuffe (11) vorgesehen ist.
  7. Einheit nach Anspruch 5 oder 6, welche darüber hinaus eine Endmutter (15) umfasst, die dazu bestimmt ist, mit einerseits dem Gewinde (8), das am gestauchten Abschlussabschnitt (4) vorgesehen ist, und andererseits der Verbindungsmuffe (11) zusammenzuwirken.
  8. Einheit nach Anspruch 7, wobei der gestauchte Abschlussabschnitt (4) eine Länge größer oder im Wesentlichen gleich der Summe der Länge in der Längsrichtung des Innengewindes (12), das an der Verbindungsmuffe (11) vorgesehen ist, und der Höhe der Endmutter (15) ist.
  9. Verfahren zur Zusammensetzung einer Bewehrung für Stahlbeton, die folgenden Schritte umfassend:
    - Vorsehen eines ersten und eines zweiten Bewehrungsstabs (2, 2') nach einem der Ansprüche 1 bis 4, wobei der erste und der zweite Bewehrungsstab (2, 2') jeweils einen gestauchten Abschlussabschnitt (4) und einen gegenüberliegenden Abschlussabschnitt (10) umfassen, der sich gegenüber dem gestauchten Abschlussabschnitt (4) befindet und mit einem Gewinde (11) versehen ist,
    - Vorsehen einer Verbindungsmuffe (12), ein Innengewinde (13) umfassend, das angeordnet ist, um mit den Gewinden (8, 11) zusammenzuwirken, die an den Abschlussabschnitten (4, 10) des ersten und zweiten Bewehrungsstabs vorgesehen sind,
    - Schrauben der Verbindungsmuffe (12) auf den gestauchten Abschlussabschnitt (4) des zweiten Bewehrungsstabs (2'),
    - Aneinanderfügen des gestauchten Abschlussabschnitts (4) des zweiten Bewehrungsstabs (2') an den gegenüberliegenden Abschlussabschnitt (10) des ersten Bewehrungsstabs (2),
    - Verdrehen der Verbindungsmuffe (12) im Verhältnis zum zweiten Bewehrungsstab (2') sodass das Innengewinde (13) der Verbindungsmuffe (12) mit dem gegenüberliegenden Abschlussabschnitt (10) des ersten Bewehrungsstabs (2') zusammenwirkt.
  10. Verfahren zur Zusammensetzung nach Anspruch 9, welches darüber hinaus umfasst:
    - einen Schritt, der vor dem Schrauben der Verbindungsmuffe (12) auf den gestauchten Abschlussabschnitt (4) des zweiten Bewehrungsstabs (2') durchgeführt wird, und darin besteht, eine Endmutter (16) auf den gestauchten Abschlussabschnitt (4) des zweiten Bewehrungsstabs (2') zu schrauben, und
    - einen Schritt, der nach dem Schritt des Verdrehens der Verbindungsmuffe (12) durchgeführt wird, und darin besteht, die Endmutter (16) im Verhältnis zum zweiten Bewehrungsstab (2') zu verdrehen, bis sie auf Anschlag an die Verbindungsmuffe (12) kommt.
  11. Verfahren zur Herstellung eines Bewehrungsstabs mit starker Haftung für Stahlbeton nach einem der Ansprüche 1 bis 4, die folgenden Schritte umfassend:
    - Vorsehen eines Bewehrungselements (2), einen Verlängerungsabschnitt (3) umfassend, der an seiner Außenfläche mit Verbundunebenheiten (6, 7) und mit einem Abschlussabschnitt versehen ist,
    - Kaltstauchen des Abschlussabschnitts, um einen ersten im Wesentlichen zylindrischen Teil (41') zu bilden, und zumindest einen zweiten Teil (42'), der zwischen dem ersten Abschnitt und dem Verlängerungsabschnitt angeordnet ist, wobei der zweite Teil (42') einen allgemeinen Querschnitt aufweist, der in Richtung des Verlängerungsabschnitts abnehmend ist, wobei der zweite Teil (42') eine Länge größer oder gleich der Länge des ersten Teils (41') aufweist,
    - Einrichten am Abschlussabschnitt eines Gewindes, das einen Gewindekern des Gewindes aufweist, der größer oder gleich dem Nenndurchmesser des Bewehrungselements ist.
  12. Verfahren zur Herstellung nach Anspruch 11, wobei der Schritt des Stauchens mit variabler Geschwindigkeit durchgeführt wird.
EP14729702.2A 2013-05-29 2014-05-15 Bewehrungsstab mit hoher haftfestigkeit für stahlbeton Active EP3004483B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1354879A FR3006351B1 (fr) 2013-05-29 2013-05-29 Barre d'armature a haute adherence pour beton arme
PCT/FR2014/051125 WO2014191648A1 (fr) 2013-05-29 2014-05-15 Barre d'armature à haute adhérence pour béton armé

Publications (2)

Publication Number Publication Date
EP3004483A1 EP3004483A1 (de) 2016-04-13
EP3004483B1 true EP3004483B1 (de) 2017-11-15

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EP (1) EP3004483B1 (de)
CN (1) CN105473798B (de)
FR (1) FR3006351B1 (de)
WO (1) WO2014191648A1 (de)

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Publication number Priority date Publication date Assignee Title
FR3034115B1 (fr) * 2015-03-25 2017-05-05 Jacques Rivoire Systeme de tirant antisismique pour la solidarisation des fondations en beton d'un ouvrage
CN113543900A (zh) * 2019-03-13 2021-10-22 巴特克集团 用于制备用于钢筋混凝土的钢筋的方法

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DE2205772B2 (de) * 1972-02-08 1975-08-28 Josef Dipl.-Ing. 8900 Augsburg Schmid Vorrichtung zum Verbinden der koaxial angeordneten Bewehrungsstäbe von zwei Betonfertigteilen
FR2639054B2 (fr) 1988-02-03 1992-07-03 Techniport Sa Perfectionnements apportes a la liaison mecanique de ronds a beton, procede de realisation de telles liaisons et rond a beton obtenu par la mise en oeuvre dudit procede
CN1060133A (zh) * 1990-09-24 1992-04-08 胡海涛 一种增加强度的钢筋螺纹连接构件
FI922525A0 (fi) * 1992-06-01 1992-06-01 Tartuntamarkkinointi Oy Foerfarande foer skaerning av en gaenga i en staong.
NL1005655C2 (nl) * 1997-03-27 1998-09-29 Hendrik Van De Riet Systeem voor het verbinden van voorwerpen.
US5967691A (en) * 1997-12-02 1999-10-19 Dayton Superior Corporation Quick connect rebar splice
NL1012410C2 (nl) * 1999-06-22 2001-01-10 R C M Ankertec B V Betonconstructie met ankerstaven alsmede ankerstaaf.
CN2900670Y (zh) * 2006-04-19 2007-05-16 评辉营造股份有限公司 钢筋续接调整装置

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Also Published As

Publication number Publication date
EP3004483A1 (de) 2016-04-13
CN105473798B (zh) 2017-07-21
WO2014191648A1 (fr) 2014-12-04
CN105473798A (zh) 2016-04-06
FR3006351A1 (fr) 2014-12-05
FR3006351B1 (fr) 2015-05-29

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