EP0554972A1 - Système d'accouplement pour barres d'armature - Google Patents

Système d'accouplement pour barres d'armature Download PDF

Info

Publication number
EP0554972A1
EP0554972A1 EP93300020A EP93300020A EP0554972A1 EP 0554972 A1 EP0554972 A1 EP 0554972A1 EP 93300020 A EP93300020 A EP 93300020A EP 93300020 A EP93300020 A EP 93300020A EP 0554972 A1 EP0554972 A1 EP 0554972A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
coupling
threading
bars
engagers
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.)
Withdrawn
Application number
EP93300020A
Other languages
German (de)
English (en)
Inventor
Brian Walter Young
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.)
Metal Bond Technology Ltd
Original Assignee
Metal Bond Technology Ltd
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
Application filed by Metal Bond Technology Ltd filed Critical Metal Bond Technology Ltd
Publication of EP0554972A1 publication Critical patent/EP0554972A1/fr
Withdrawn legal-status Critical Current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
    • E04C5/16—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 reinforcing bar coupling.
  • the radial loading which can be imposed by the bolts is a function of the yield strength of the sleeve material and this determines how many bolts will be required to achieve a desired ultimate tensile strength.
  • a vanadium HFS (hot finish sleeve tube) material for the sleeve.
  • the present invention arises from our endeavour to provide an equivalent strength of coupling at reduced cost.
  • the present invention provides a coupling fitting for making joints in reinforcing bars or wires for structural concrete, comprising a sleeve-like device having means for locating it over and about portions of said bars or wires adjacent said design joint with clearance to said bar or wire portions, wherein the means for locating comprises for each portion engagers at radial spacings relative to the axis of bars or wires to be joined, one of which engagers for each portion is positively adjustable at emplacement through the side wall of the device and the other engagers comprise radially spaced ribs which are profiled to key into at least the bars or wire portions, and in which the positively adjustable engager is received in threading of or associated with the sleeve and in which the threading has a higher yield strength than the sleeve material.
  • the sleeve has a hole which receives an insert having said threading.
  • threading formed directly in the sleeve and is subject to localised hardening.
  • positively adjustable engager employed for each portion and a respective threading for each. The number used is dictated by the size of the bars or wires being joined and the required tensile load.
  • For couplers of equivalent tensile strength to those described in our above patent specification costs are reduced by using inserts which have a higher yield strength than the sleeve material, and by this means the sleeve material can have a lower material specification. For example yield strength may be reduced from say 460N/mm2 to 360N/mm2.
  • HFS instead of vanadium HFS.
  • a preferred embodiment of insert has a cylindrical part to be received in the hole of the sleeve and an enlarged flange to one end having a shoulder which engages with an inner bore of the sleeve.
  • the flange prevents the insert from pulling out under the action of the positive engager and also serves to stabilise the insert to further prevent canting.
  • the enlarged flange may be dispensed with where the insert comprise a frusto-conical sleeve engaging with the correspondingly tapered hole of the sleeve.
  • the flange has a major axis longer than its minor axis and in use the major axis is aligned with the longitudinal direction of the coupling.
  • a coupling fitting for use in securing together ends of reinforcing bars or wires for subsequent embedment in structural concrete, comprises a tubular sleeve 1 having an internal diameter such as to fit about end portions of bars or wires in spaced relation thereto.
  • the sleeve is constructed symmetrically about its mid point and in the illustrated embodiment has, for each half, three holes 3 through the wall of the sleeve which receive a respective threaded insert 4 having a threaded bore 5 to receive positively adjustable engagers, in the form of threaded screws or bolts 7.
  • the holes 3 are spaced along the length of the coupling.
  • the inserts have a yield strength of at least 800N/mm2 whilst the sleeve will have a lower yield strength typically less then 460N/mm2 and more usually in the region of 360N/mm2.
  • the bolts are preferably cap screws and with a reduced shank as at 8 so that the head shears off at a predetermined torque on screwing them in place.
  • the end of the bolt 7 is formed with indentation means 9 to penetrate into the bar or wires on doing up, either as a tapered point, or a convex or concave formation providing either a biting point or an annular biting edge.
  • the bolts are hardened to 52 Rockwell C.
  • the inserts are illustrated further in Figures 4 and 5 and comprise a cylindrical sleeve portion 19 dimensioned to fit in the holes 3 as push fit and one end of the sleeve has an enlarged flange portion 21.
  • the flange portion is generally elliptical with its major and minor axis dimensions larger than the diameter of the cylindrical portion 19 so as to provide a shoulder 22 which, when the insert is placed in the hole 3, engages against the inner wall of the sleeve.
  • the major axis is aligned with the longitudinal axis of the coupling.
  • the inserts are made from a material having a yield strength of the order of 850 newtons per mm2 and the sleeve is made from a HFS specification material.
  • the length of the threaded holes 5 is greater than the wall thickness of the sleeve and this allows an increased radial loading to be employed on the bolts without the threads stopping whilst utilising a reduced wall thickness for the sleeve.
  • two longitudinal ribs 13 are provided acting as radial engagers to which the bar or wire portions abut in use.
  • the ribs are spaced apart circumferentially by angle A, preferably of the order of 1200.
  • the ribs are positioned straddling the axis 15 of a positively adjustable engager 7 and in the opposite half of the sleeve.
  • the ribs run substantially the length of the sleeve with soft tack welding 17 at each end which provides a convenient means of locating the ribs to the sleeve longitudinally and circumferentially during emplacement before doing up of the positively adjustable engagers.
  • the ribs are profiled to both sides in the illustrated embodiment so as to key into the wires and the sleeve when tightening of the positively adjustable engagers.
  • the coupling sleeve is fitted over and about adjacent ends (butting up to one another for a straight sleeve) of the coupling bars or wires to be joined so centering the bars within the sleeve and causing the radial engagers to key into the bars, also the sleeve where the ribs are profiled to both sides.
  • the ends of the positively adjustable engagers also bite into the bars.
  • the bolts shear off at the outer surface of the sleeve at a torque determined to give required cooperating engagement of the engagers with the bar and/or sleeve. Such an arrangement provides the required mechanical strength.
  • Increased radial loading of the bolts is made possible by the use of higher yield strength material for the inserts but this means the number of bolts required for each half of the coupling can be reduced for a given coupling strength. This also facilitates reduction of the length of the coupling.
  • the invention has been described with reference to straight put joint in which a straight sleeve is employed. This is probably the most common joint configuration, but the invention also extends to sleeve-like devices for coupling bars or wires at angles to one another by suitable configuration of the sleeve to receive appropriately orientated ends of bars or wires.
  • the arrangement of the combination of two profiled engagers (ribs) and positively adjustable engagers (bolts) may also be produced using a casting.
  • a suitable end section is shown in Figure 6.
  • the sleeve threads 5' and the rib profiles 13' are integral with the sleeve 1' and are hardened to 52 Rockwell C units by induction heat treatment and water quenching.
  • the aforedescribed inserts may be used as already described above.

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)
EP93300020A 1992-01-10 1993-01-04 Système d'accouplement pour barres d'armature Withdrawn EP0554972A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9200446 1992-01-10
GB929200446A GB9200446D0 (en) 1992-01-10 1992-01-10 Reinforcing bar coupling

Publications (1)

Publication Number Publication Date
EP0554972A1 true EP0554972A1 (fr) 1993-08-11

Family

ID=10708363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93300020A Withdrawn EP0554972A1 (fr) 1992-01-10 1993-01-04 Système d'accouplement pour barres d'armature

Country Status (5)

Country Link
EP (1) EP0554972A1 (fr)
JP (1) JPH05230936A (fr)
CA (1) CA2086956A1 (fr)
GB (1) GB9200446D0 (fr)
NO (1) NO930064L (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721641A1 (fr) * 1994-06-28 1995-12-29 Mure Ets Tête de tirant d'ancrage.
GB2334743A (en) * 1998-08-07 1999-09-01 Mouchel Consulting Limited System for prestressing structures
NL1012499C2 (nl) 1999-07-02 2001-01-03 Novitec Internat B V Koppelorgaan voor wapeningsstaven.
WO2003093602A2 (fr) * 2002-05-01 2003-11-13 Ultimate Design Solutions Ltd Dispositif de couplage
SG117487A1 (en) * 2003-05-26 2005-12-29 Halfen Gmbh & Co Kg Device for connecting ends of bars
EP1898017A1 (fr) * 2006-09-08 2008-03-12 Dextra Asia Dispositif pour relier des extrémités de barre
WO2018207109A1 (fr) * 2017-05-11 2018-11-15 Eggenweiler Florian N Dispositif de connexion pour barres de stores

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687181A (en) * 1967-08-31 1972-08-29 Threadline Fastener Corp Fastener and method of making the same
US3864806A (en) * 1971-11-08 1975-02-11 Le Roy P Hanson Method of repairing stripped spark plug threads in engine heads
EP0198275A1 (fr) * 1985-04-16 1986-10-22 Ludwig Kraemer Ecrou à river
EP0272020A1 (fr) * 1986-12-10 1988-06-22 Harry Francis Cole Pièce pour création d'une vis dans un trou de forage
GB2220241A (en) * 1988-06-21 1990-01-04 Metal Bond Reinforcing bar coupling system.
FR2645922A1 (fr) * 1989-04-18 1990-10-19 Gouy Jean Claude Organe d'assemblage destine a etre insere dans un materiau fragile notamment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687181A (en) * 1967-08-31 1972-08-29 Threadline Fastener Corp Fastener and method of making the same
US3864806A (en) * 1971-11-08 1975-02-11 Le Roy P Hanson Method of repairing stripped spark plug threads in engine heads
EP0198275A1 (fr) * 1985-04-16 1986-10-22 Ludwig Kraemer Ecrou à river
EP0272020A1 (fr) * 1986-12-10 1988-06-22 Harry Francis Cole Pièce pour création d'une vis dans un trou de forage
GB2220241A (en) * 1988-06-21 1990-01-04 Metal Bond Reinforcing bar coupling system.
FR2645922A1 (fr) * 1989-04-18 1990-10-19 Gouy Jean Claude Organe d'assemblage destine a etre insere dans un materiau fragile notamment

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721641A1 (fr) * 1994-06-28 1995-12-29 Mure Ets Tête de tirant d'ancrage.
WO1996000819A1 (fr) * 1994-06-28 1996-01-11 Ancon Clark Limited Ensemble tirant de raccordement
GB2334743A (en) * 1998-08-07 1999-09-01 Mouchel Consulting Limited System for prestressing structures
NL1012499C2 (nl) 1999-07-02 2001-01-03 Novitec Internat B V Koppelorgaan voor wapeningsstaven.
WO2003093602A2 (fr) * 2002-05-01 2003-11-13 Ultimate Design Solutions Ltd Dispositif de couplage
WO2003093602A3 (fr) * 2002-05-01 2004-01-08 Ultimate Design Solutions Ltd Dispositif de couplage
EP1501989B1 (fr) * 2002-05-01 2006-07-26 Ultimate Design Solutions Ltd. Dispositif d'assemblage
US7093402B2 (en) 2002-05-01 2006-08-22 Ultimate Design Solutions Ltd. Coupling device
US7107735B2 (en) 2002-05-01 2006-09-19 Ultimate Design Solutions Ltd. Coupling device
SG117487A1 (en) * 2003-05-26 2005-12-29 Halfen Gmbh & Co Kg Device for connecting ends of bars
EP1898017A1 (fr) * 2006-09-08 2008-03-12 Dextra Asia Dispositif pour relier des extrémités de barre
WO2018207109A1 (fr) * 2017-05-11 2018-11-15 Eggenweiler Florian N Dispositif de connexion pour barres de stores

Also Published As

Publication number Publication date
CA2086956A1 (fr) 1993-07-11
GB9200446D0 (en) 1992-02-26
NO930064L (no) 1993-07-12
NO930064D0 (no) 1993-01-08
JPH05230936A (ja) 1993-09-07

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