EP0327770B2 - Procédé de réalisation de liaison mécanique de ronds à béton, rond à béton autorisant la mise en oeuvre du dit procédé et liaison mécanique de ronds à béton ainsi réalisée - Google Patents

Procédé de réalisation de liaison mécanique de ronds à béton, rond à béton autorisant la mise en oeuvre du dit procédé et liaison mécanique de ronds à béton ainsi réalisée Download PDF

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Publication number
EP0327770B2
EP0327770B2 EP88403093A EP88403093A EP0327770B2 EP 0327770 B2 EP0327770 B2 EP 0327770B2 EP 88403093 A EP88403093 A EP 88403093A EP 88403093 A EP88403093 A EP 88403093A EP 0327770 B2 EP0327770 B2 EP 0327770B2
Authority
EP
European Patent Office
Prior art keywords
concrete
diameter
section
fact
connection
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
EP88403093A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0327770B1 (fr
EP0327770A1 (fr
Inventor
Alain Bernard
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.)
A MURE ETS
Original Assignee
A MURE ETS
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26226495&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0327770(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from FR8801611A external-priority patent/FR2626600B1/fr
Application filed by A MURE ETS filed Critical A MURE ETS
Priority to AT88403093T priority Critical patent/ATE84836T1/de
Publication of EP0327770A1 publication Critical patent/EP0327770A1/fr
Publication of EP0327770B1 publication Critical patent/EP0327770B1/fr
Application granted granted Critical
Publication of EP0327770B2 publication Critical patent/EP0327770B2/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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5733—Plural opposed sockets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5746—Continuous thread

Definitions

  • the invention relates to a method of making a mechanical connection of concrete rods, as well as a mechanical connection of concrete rods thus produced. It will find its application in particular in the field of construction of building elements or concrete buildings.
  • Another proposed technique consists in using a mechanical connection.
  • the conical thread system in which the ends of the concrete rods to be bonded are machined in the form of a conical thread, which allows them to be fitted and screwed inside a coupler to drown in the concrete block.
  • This system also does not allow the use of a simple coupling sleeve with right and left thread to ensure the junction with adjustment of the traction. It is necessary to use several pieces to constitute a stack and allow a length adjustment.
  • this technique requires oversizing the diameters of concrete bars, of the order of 20%, in order to resist the forces which are concentrated at the threaded ends of the bars. Its cost is high.
  • Document GB-1.546.253 discloses a mechanical connection of concrete rods, in which the threaded ends of the concrete rods are assembled end to end using tapped connection sleeves.
  • the objective of this document is to propose to put the threads of the rounds in compression and the threads of the sleeve in tension; this is authorized by providing between the two threads of the sleeve a space less than the space formed by the two chamfers of the ends of the rounds to be bonded.
  • Another mechanical connection is also used; it is the crimping of the ends of rounds to be joined.
  • a sleeve is used in which the two ends of the concrete rods are threaded. Using a jack and a press, the bush is crimped onto the concrete bars.
  • Document FR-1-1.047.189 discloses a fastening process for wires and metal bars in which the fastening is essentially constituted by a frusto-conical pressurized head, cold stamped, this after introduction of the wire or the bar into the fasteners.
  • the shape of the head is such that it gives the fastener the necessary support and sufficient shear strength to transfer the danger of breaking into the wire or the bar.
  • Standard BS-81 10: par 1: 1985-3.12.8.16.2 stipulates that concrete reinforcing bars assembled by means of a connecting sleeve must be able to undergo a tensile test in which the circles are subjected to a force corresponding to 60 of the elastic limit and after which the permanent elongation must not exceed 0.1 mm.
  • the main object of the present invention is to present a method of making a mechanical connection of concrete rods, to a concrete rod authorizing the implementation of said method as well as to a mechanical connection of concrete rods thus produced which offer the advantages of high job security, easy implementation and competitive cost, while overcoming the drawbacks of known systems.
  • the technique of the present invention requires limited machining and the use of conventional, non-binding means.
  • One of the aims of the present invention is to propose a method for producing a mechanical connection of concrete rods, as well as a mechanical connection of concrete rods thus produced, which make it possible to comply with the very severe criteria of deformation imposed by certain standards. or certain regulations imposing tests up to 80% of the elastic resistance.
  • One of the aims of the present invention is to propose a method for making a mechanical connection of concrete rods which makes it possible to make mechanical connections in which all the threaded concrete rods are tested, which is fundamental in terms of quality control and which provides an important guarantee for the structure.
  • the mechanical connection of concrete rod obtained by the implementation of the method of the present invention comprising at least one connecting sleeve having at least one internal thread, as well as a concrete rod to be bonded having a nominal section.
  • " ⁇ " and at least one end to be bonded is characterized in that the said end to be bonded has at least one zone reinforced by cold delivery, carrying a threaded portion and corresponding to said tapping, said reinforced zone having a section of diameter "d 1 " greater at said nominal section " ⁇ ", said threaded part having a bottom diameter "d 2 ", and being provided on said reinforced zone such that the diameter "d 2 " is equal to or greater than the nominal section " ⁇ ".
  • the present invention relates to a method for making a mechanical connection of concrete rods, to a concrete rod authorizing the implementation of said method, as well as to a mechanical connection of concrete rods thus produced which will find their applications in particular in construction of concrete elements, buildings or buildings.
  • tie rods are used which pass right through the concrete elements and which are placed under tension to generate a compressive force in the concrete.
  • the adjustment of the tensile force and the choice of the location of the tie rods must be carefully determined by preliminary calculations.
  • the tie rods are formed by a combination of concrete bars placed end to end.
  • the junction used to secure the concrete reinforcing bars must be able to withstand the tensile force, be easily installed and also be economical.
  • the mechanical connection of the present invention makes it possible to secure two concrete rods 1 and 2, end to end, substantially coaxially as illustrated in FIG. 1.
  • a tapped sleeve 3 for connection is used to receive the ends threaded 4 and 5 respectively of concrete rods 1 and 2.
  • the end of the concrete reinforcing bar is reinforced, so that it is more resistant than the central part of the bar.
  • the rupture occurs in the central part of the bar and no longer at the junction.
  • the choice of the section of the concrete reinforcing bar can be made according to the resistance to be obtained in the central part of the bar and no longer in the weakened part of the connection as is traditionally encountered.
  • the concrete rods used in the context of the present invention will be of smaller cross section, which allows substantial savings to be made.
  • the reinforcement of the end of the concrete rod to be bonded is obtained, prior to threading, by a cold discharge.
  • the traditional cold backflow technique requires dimensional changes in the workpiece to be greater than 30%. For example, a diameter of 40 mm cold pressed using traditional techniques leads to a diameter of around 55 mm. However, such a deformation of the material does not provide the expected results and there is a loss of strength. This is mainly located at the level of the diameter change zone. Tensile tests show that failure occurs at this level.
  • the end is reinforced over the length of the thread by a cold delivery which provides an increase in diameters, equal to or less than 30%, and in particular between 10 and 30%.
  • This value makes it possible both to obtain an increase in resistance due to the increase in section and also a slight increase in internal stress so as not to weaken the concrete reinforcing bar at the level of the change in diameter.
  • Table 1 indicates, by way of example, values of delivery diameter d 1 to be obtained before threading as a function of the nominal diameter ⁇ of the bar used, giving good results in use. TABLE 1 ⁇ nominal mm d 1 mm thread d 1 - ⁇ ⁇ 16 20 25% 20 24 20% 25 30 20% 32 36 12% 40 45 12% 50 56 12% 56 64 14%
  • the values indicated show that the cold discharge can be in percentage the smaller the larger the diameter of the bar.
  • the section of the concrete ring at the level of the thread d 2 of the discharge end must be at least slightly greater than the current section ⁇ of the concrete round to be connected.
  • the delivery operation of the present invention must be carried out cold. Indeed, a hot discharge has the drawback of weakening the transition zone due to uncontrolled cooling. Generally, hyper-quenching occurs which weakens the metal. The hot process must also be implemented off site because it requires ovens which must be supplied with energy often not available on site.
  • Concrete rounds being generally made of steels with a high carbon and manganese content, are therefore very sensitive to thermal shock and cold delivery is therefore recommended.
  • the length of the thread produced at the end of the concrete rounds must correspond appreciably to the diameter ⁇ of the said round to provide safety, since thread lengths of 0.7 times the diameter are sufficient to resist traction. However, it could be higher.
  • the mechanical connection of the present invention may also be implemented in the case of fixed concrete rods, which cannot be spread apart as illustrated in FIG. 2.
  • one of the bars 1 has a thread 4 of double length made around a repressed end, and the sleeve 3 initially placed around the thread 4 will be rotated to cover the threads of the concrete rods 2.
  • the threads 4 and 5 will have the same direction.
  • the implementation of the mechanical connection of the present invention can also be carried out at the level of anchor points for concrete rods 1 as illustrated in FIG. 3.
  • the threaded end 4 of the concrete rod receives a backflow made cold to strengthen it, and this end is fixed to an anchor sleeve 6 secured to the block 7 of concrete.
  • the end 4 and / or 5 of the concrete reinforcing bar 1 and / or 2, reinforced by a discharge, is prestressed.
  • Figures 4 and 5 illustrate by way of example two devices that can be used.
  • a threaded support sleeve 11 is placed on it, then the concrete rod thus equipped is immobilized and the end considered 4 is subjected to action a cylinder 6 or the like.
  • the sleeve 11 is then blocked on the support plate 7 and the jack acts directly on the end to be constrained.
  • the end 8 of the jack can be equipped with a punch which makes an indelible mark at the level of the driven end 4.
  • Figure 5 shows a completely equivalent procedure, but reversed, in which one implements a threaded support sleeve 11 and a support plate 7. But, in this case, it is the body of the concrete ring 1 which is blocked by any clamp device, shown schematically at 9 in the figure, and the jack acts on the support plate 7, in the direction of the arrows 10, action which is reflected on the threaded support sleeve 11 for realize the constraint of the end 4.
  • a mechanical compression stress is carried out with an equivalent force of between 70 and 95% of the elastic limit of the concrete reinforcing bar.
  • This method of producing a concrete reinforcing bar therefore makes it possible to obtain a concrete reinforcing bar 1 or 2 having a forced threaded forced end 4 or 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Forging (AREA)
EP88403093A 1988-02-03 1988-12-06 Procédé de réalisation de liaison mécanique de ronds à béton, rond à béton autorisant la mise en oeuvre du dit procédé et liaison mécanique de ronds à béton ainsi réalisée Expired - Lifetime EP0327770B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88403093T ATE84836T1 (de) 1988-02-03 1988-12-06 Verfahren zur realisierung von mechanischen betonstahlverbindungen, betonstahlverbindung fuer ein solches verfahren, und entsprechend erzielte mechanische betonstahlverbindung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8801611A FR2626600B1 (fr) 1988-02-03 1988-02-03 Liaison mecanique de ronds a beton
FR8801611 1988-02-03
FR8815472 1988-11-14
FR888815472A FR2639054B2 (fr) 1988-02-03 1988-11-14 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

Publications (3)

Publication Number Publication Date
EP0327770A1 EP0327770A1 (fr) 1989-08-16
EP0327770B1 EP0327770B1 (fr) 1993-01-20
EP0327770B2 true EP0327770B2 (fr) 1997-12-03

Family

ID=26226495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88403093A Expired - Lifetime EP0327770B2 (fr) 1988-02-03 1988-12-06 Procédé de réalisation de liaison mécanique de ronds à béton, rond à béton autorisant la mise en oeuvre du dit procédé et liaison mécanique de ronds à béton ainsi réalisée

Country Status (17)

Country Link
US (1) US5158527A (fi)
EP (1) EP0327770B2 (fi)
JP (1) JPH083238B2 (fi)
KR (1) KR940008311B1 (fi)
CN (1) CN1035834C (fi)
AU (1) AU610686B2 (fi)
CA (1) CA1327893C (fi)
DE (1) DE3877739T3 (fi)
DK (2) DK169359B1 (fi)
ES (1) ES2039677T5 (fi)
FI (1) FI90457C (fi)
FR (1) FR2639054B2 (fi)
GR (1) GR3026255T3 (fi)
HK (1) HK119693A (fi)
MY (1) MY103809A (fi)
NO (1) NO176848C (fi)
PT (1) PT89599B (fi)

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US9010165B2 (en) 2011-01-18 2015-04-21 Nucor Corporation Threaded rebar manufacturing process and system
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US20140271034A1 (en) * 2013-03-14 2014-09-18 John D. Pryor Post installed concealable concrete anchor
CN104060770B (zh) * 2013-03-22 2016-03-30 中冶建筑研究总院有限公司 钢筋机械连接方法
FR3006351B1 (fr) 2013-05-29 2015-05-29 Magnetude Barre d'armature a haute adherence pour beton arme
CN104251797A (zh) * 2014-09-30 2014-12-31 任红 一种玻璃筋材抗拉实验用的夹具
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Also Published As

Publication number Publication date
DE3877739T3 (de) 1999-01-14
DK48189D0 (da) 1989-02-02
NO176848B (no) 1995-02-27
NO890432L (no) 1989-08-04
HK119693A (en) 1993-11-12
KR890013297A (ko) 1989-09-22
ES2039677T3 (es) 1993-10-01
MY103809A (en) 1993-09-30
AU2890189A (en) 1989-08-03
CN1035834C (zh) 1997-09-10
FR2639054B2 (fr) 1992-07-03
US5158527A (en) 1992-10-27
JPH083238B2 (ja) 1996-01-17
EP0327770B1 (fr) 1993-01-20
FI890509A0 (fi) 1989-02-02
JPH01295958A (ja) 1989-11-29
FI890509A (fi) 1989-08-04
EP0327770A1 (fr) 1989-08-16
ES2039677T5 (es) 1998-05-01
PT89599A (pt) 1989-10-04
DK48189A (da) 1989-08-04
FR2639054A2 (fr) 1990-05-18
CN1046205A (zh) 1990-10-17
NO176848C (no) 1995-06-07
FI90457C (fi) 1994-10-14
GR3026255T3 (en) 1998-05-29
DE3877739T2 (de) 1993-08-19
NO890432D0 (no) 1989-02-02
CA1327893C (en) 1994-03-22
DK169359B1 (da) 1994-10-10
PT89599B (pt) 1994-01-31
DE3877739D1 (de) 1993-03-04
FI90457B (fi) 1993-10-29
AU610686B2 (en) 1991-05-23
KR940008311B1 (ko) 1994-09-12

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