EP1898017A1 - Dispositif pour relier des extrémités de barre - Google Patents

Dispositif pour relier des extrémités de barre Download PDF

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Publication number
EP1898017A1
EP1898017A1 EP06018851A EP06018851A EP1898017A1 EP 1898017 A1 EP1898017 A1 EP 1898017A1 EP 06018851 A EP06018851 A EP 06018851A EP 06018851 A EP06018851 A EP 06018851A EP 1898017 A1 EP1898017 A1 EP 1898017A1
Authority
EP
European Patent Office
Prior art keywords
internal cavity
bars
longitudinal axis
locking elements
extremity
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Withdrawn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
EP06018851A
Other languages
German (de)
English (en)
Inventor
Jean-Jacques Braun
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.)
Dextra Asia Co Ltd
Original Assignee
Dextra Asia Co 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 Dextra Asia Co Ltd filed Critical Dextra Asia Co Ltd
Priority to EP06018851A priority Critical patent/EP1898017A1/fr
Priority to US11/537,954 priority patent/US20080060291A1/en
Publication of EP1898017A1 publication Critical patent/EP1898017A1/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Withdrawn legal-status Critical Current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

  • this system presents the advantage of not needing any preparation of the bar end. This means that it is not necessary to either transport the bars to a workshop where their ends can be prepared, or transport to the location of the bars the machinery needed to prepare their ends.
  • This system was indeed developed with the aim of enabling a site assembly, with only a pneumatic or electric wrench needed to torque the screws.
  • a site assembly is a great benefit in some industries such as the construction or the oil industry. It is also a great benefit in large countries where transport of bars is an issue, due to long distances.
  • EP 0 554 972 has some drawbacks as follows.
  • the pneumatic and electric tools that are commonly available on the market are of limited capacity, which means that it is not possible to increase the size or strength of the screws beyond a certain limit. The connection of larger or stronger bars is therefore not possible.
  • the effort generated by torquing the screws serves to press the racks into the sleeve as much as to press them into the bars. Less than half of the tightening effort is thus available to actually clamp the bars.
  • its performance under a tensile load is very difficult to maintain and to control.
  • the effectiveness of the fitting of the sleeve onto the bar end wholly depends on the torque applied on the screws, which is the torque at which the screw heads shear off. These screws have their neck reduced so that the shearing occurs outside their threaded area.
  • the precision of this diameter reduction, as well as the radius at the bottom of the reduction, are difficult to achieve.
  • the stress riser at the reduction may vary from 1 to 4, depending on the radius at the bottom of the reduction, which on top of being difficult to produce accurately, is also difficult to measure and control. This variation in stress riser affects directly the torque at which the screws shear off, and consequently the performance of the system.
  • the screws are calculated to shear off under a purely torsion effort.
  • the pneumatic or electric wrench or screwdriver is perfectly aligned on the axis of the screw. Because this tool is manually held, a certain angle between its axis and that of the screw is unavoidable. Such an angle adds a flexural effort to the torsion effect, thereby reducing the torque necessary to shear off the screws, and hence reducing the system performance.
  • EP 1 482 187 Also known is a device as disclosed in EP 1 482 187 that also works essentially in the same way as the ones previously cited, but provides two rows of screws and uses an internal thread rather than racks to produce the gripping effect inside the sleeve. Being so closely related to the two products cited above, it doesn't bring any additional benefit, but suffers from the additional drawback that the angle between the two rows of screws requires extra free space for its installation.
  • the device for connecting bar ends further comprises at least one locking element movably arranged inside the hollow body, and the internal cavity of said body comprises at least one slope, that is inclined relative to the longitudinal axis of said body, while said at least one locking element each comprises an inclined face that matches the profile of said at least one slope, and a gripping face having at least one protrusion.
  • the device according to the present invention allows to achieve a "self-locking effect" in which the clamping/gripping force of the device increases with increased loading of the bar(s) to be connected.
  • the device according to the invention achieves a high loading bearing performance on an improved safety and reliability level.
  • it provides improved safety not only to the installer but also to the people working around him on an industrial or construction site.
  • the device may be adapted to receive on bar only, for instance if on part of the device is welded to a structure, it is preferred that the hollow body has at least two insertion openings and that the internal cavity of said body comprises at least two slopes, that are inclined relative to the longitudinal axis of said body, these inclinations being in opposite directions. As a result, plural bars can be reliably connected in a self-locking manner.
  • slopes and inclined faces are not particularly limited in the present invention, as long as cooperating slopes and inclined faces are matching to each other. They may be flat or curved, for example.
  • the gripping surface is generally parallel to the longitudinal axis of said body.
  • the material of the gripping surface is chosen and its teeth are shaped to suitably bite into the material of the bars to be connected.
  • the cross-section area of the internal cavity of said hollow body is not regular but increases from a minimum at the extremity towards a maximum at the middle and then decreases back to a minimum at the other extremity.
  • the cross-section area of the internal cavity may also decrease from a maximum at the extremity towards a minimum at the middle and then increase back to a maximum at the other extremity.
  • the shape and type of the radially-adjustable clamping elements is not specifically limited in the present invention. In many cases, these will be screws which may have pointed or flat ends, depending on the material of the bars to be connected. They may have standard necks or neck reductions designed to shear under a certain torque. Further, there may be provided one or more rows of screws.
  • stop means are provided in the internal cavity of the body.
  • said locking elements are of different radial thickness in order to accommodate bars of different sizes.
  • the locking elements may in the present invention act as "passive" locking elements which develop a "self-locking effect" only after an increase load has been brought on the bars to be connected.
  • the device according to the present invention further comprises pushing means for pushing said locking elements from outside of said body.
  • the locking elements may be prestressed and/or the rish can be reduced during fastening the radially-adjustable clamping elements that the at least one locking element(s) slides away.
  • At least one internal phase of said body comprises ribs or grooves. This will improve the bond and anchoring of the device when it is cast inside another material such as in concrete, for example.
  • a corrosion-protection or binding substance is poured or injected inside said body.
  • the present invention provides a method of connecting bars using the device as described above. Further details on the method of connecting bar ends according to the present invention will be apparent from the following detailed description.
  • a device 1 for connecting the ends 2' of a bar according to a first embodiment of the present invention is schematically shown in a perspective view in Fig. 1 as well as in a cross-section view in Fig. 2.
  • the device is adapted for connecting bar ends of rebars and the like as they are used in construction, for instance in reinforced concrete structures but may also be used for other bars.
  • the device 1 comprises a hollow body 10 having an internal cavity 12 which, in the present embodiment, comprises two insertion openings 14 through which a longitudinal axis extends. The direction of extension of the longitudinal axis coincides with the direction of extension of the bars 2 to be connected (Fig. 2). Further, the device 1 comprises a plurality of clamping screws 16 which are fitted into threaded holes formed in the hollow body 10. The screws may have a reduced neck so as to produce a defined failure. As can be seen in Fig. 2, the screws 16 are adapted to press on the bars 2 inserted into the hollow body 10.
  • the device 1 comprises two locking elements 18 which are movably arranged inside the internal cavity 12 of the hollow body 10.
  • the internal cavity 12 of the body 10 comprises two slopes 12' which are inclined relative to the longitudinal axis of the body 10, and the locking elements 18 each comprise a inclined face 18' which matches the profile of the corresponding slope 12' and is in contact therewith.
  • each locking element 18 has a gripping face 18" having a plurality of rack teeth. The gripping face 18" is adapted to grip and fix the respective bar 2 together with the screws 16. Therefore, it is preferred that the gripping faces 18" are generally parallel to the longitudinal axis of the bars 2/body 10.
  • the device 1 further comprises stop means 20, for example in the form of stop or separation walls. As shown in Fig. 6, this stop or separation wall 20 may also fully separate the internal cavity 12 in two parts.
  • ribs or grooves 24 may be provided on the external surface of said body 10.
  • connection is achieved by inserting the ends 2' of bars 2 until they hit the wall 20.
  • the screws 16 are then tightened either until a given torque, or until their heads shear off, thereby forcing the ends 2' of bars 2 against the gripping face 18" of the locking elements 18, and locking themselves into the surface material of said bars 2.
  • the bars 2 are then put in use and sustain a tensile load.
  • This tensile load tends to pull both bars apart, along with the locking elements 18 thanks to the gripping achieved on their gripping faces 18" .
  • the locking elements 18 move apart by sliding over the slopes 12', they force their grip 18" further into the material of the bars 2.
  • the resistance of the device increases with the load applied on the bars.
  • Fig. 3 relates to a second embodiment for applications where it is necessary to fill up said cavity 12 with a corrosion-protection or binding substance, end caps 26 may be provided to close the spaces at each extremity of the connection, and a hole 28 may be provided in said body 10, through which said substance may be poured or injected.
  • Figs. 4 and 5 show that the external shape of the hollow body 10 may be widely varied within the present invention. Further, the device 1 may comprise one row or also plural rows of screws 16, as shown in FIG. 5.
  • the shape of the locking elements 18 is not specifically limited in the present invention.
  • Various examples of suitable locking elements 18 are shown in FIGS. 7A to 7G.
  • the inclined face 18' may be flat or curved just like the gripping face 18" .
  • further designs are possible.
  • Fig. 8 shows an embodiment which is adapted to connecting bars 2 having different diameters.
  • the locking elements 18 have a different radial thickness.
  • the locking element 18 on the left handside is adapted to grip a bar 2 having a smaller diameter and, therefore, itself has a smaller radial thickness than the locking element 18 on the right handside.
  • Figs. 9 and 10 show a sixth and seventh embodiment, respectively, with additional pushing means 22 for pushing the locking elements 18 against the ends 2' of bars 2 prior to the tightening of screws 16.
  • This feature is illustrated in Fig. 9 with a cam 23 that is rotated around its axis.
  • the pushing means 22 comprises a central screw 25 that pushes on the rear faces of the locking elements 18.
  • Fig. 11 schematically shows an eighth embodiment of the present invention for cases where the connection must withstand not tensile, but mainly compression efforts.
  • the slopes 12' are diverging towards the insertion openings 14.
  • the locking elements 18 are moving towards the center of the body, thereby securing the clamping of the bars 2.
  • Fig. 12 schematically shows an ninth embodiment of the present invention for the cases where the connection must withstand alternate tensile and compression efforts.
  • a total of four locking elements 18a, 18b are provided, namely two locking elements 18a, 18b per bar 2.
  • the locking elements 18a, 18b of each bar have their respective slopes 18' inclined in opposite directions.
  • the locking elements 18a are moving towards the extremities of the body, thereby securing the clamping of the bars.
  • Under a compression effort the locking elements 18b are moving towards the centre of the body, thereby securing the clamping of the bars.
  • connection of the bars 2 is achieved by inserting the device 1 over the end 2' of a first bar 2, said bar end 2 being received by the cavity 12 between the locking element 18 and the screws 16.
  • a second bar 2 is then inserted into the other side of the device 1.
  • the device can now be oriented in the radial direction deemed most suitable either for access purpose or for space optimisation.
  • the pushing means 22 may then be used to reduce the clearance between the bars 2 and the device 1.
  • the screws 16 are finally torqued so that they press the bar 2 against the locking elements 18 and themselves penetrate into the surface of the bars 2.
  • the initial resistance comes from the gripping effect between the screws 16 and the locking elements 18.
  • the locking elements 18 move along the slopes 12' of the body 10, and further lock the bar ends 2' inside the cavity, thereby greatly improving the tensile performance: the stronger the pull on the bars, the stronger the lock.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
EP06018851A 2006-09-08 2006-09-08 Dispositif pour relier des extrémités de barre Withdrawn EP1898017A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06018851A EP1898017A1 (fr) 2006-09-08 2006-09-08 Dispositif pour relier des extrémités de barre
US11/537,954 US20080060291A1 (en) 2006-09-08 2006-10-02 Device for connecting bars end-to-end

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06018851A EP1898017A1 (fr) 2006-09-08 2006-09-08 Dispositif pour relier des extrémités de barre

Publications (1)

Publication Number Publication Date
EP1898017A1 true EP1898017A1 (fr) 2008-03-12

Family

ID=37714521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06018851A Withdrawn EP1898017A1 (fr) 2006-09-08 2006-09-08 Dispositif pour relier des extrémités de barre

Country Status (2)

Country Link
US (1) US20080060291A1 (fr)
EP (1) EP1898017A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700069007A1 (it) * 2017-06-21 2018-12-21 Tecnaria S P A Dispositivo per la giunzione meccanica di barre di acciaio
US11293182B2 (en) 2016-09-12 2022-04-05 Coupler Solutions Limited Coupling device, associated parts and a method of use thereof
US20230057280A1 (en) * 2021-08-23 2023-02-23 Jeffrey Marshall Impalement hazard protective cap

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WO2009092019A1 (fr) * 2008-01-16 2009-07-23 Weaver Jason M Appareil et procédés de couplage de fers
WO2009152412A2 (fr) * 2008-06-12 2009-12-17 University Of Utah Research Foundation Eléments de renforcement allongés pour ancrage, raccordement et mise en tension
US8904721B2 (en) * 2008-06-12 2014-12-09 University Of Utah Research Foundation Anchoring, splicing and tensioning elongated reinforcement members
US9404254B2 (en) 2013-12-24 2016-08-02 Reigstad & Associates, Inc. Post-tension concrete leave out splicing system and method
US20150176276A1 (en) * 2013-12-24 2015-06-25 Reigstad & Associates, Inc. Post-tension concrete leave out splicing system and method
US9644369B2 (en) * 2013-12-24 2017-05-09 Reigstad & Associates, Inc. Post-tension concrete leave out splicing system and method
US9410316B2 (en) 2013-12-24 2016-08-09 Reigstad & Associates, Inc. Post-tension concrete leave out splicing system and method
US9598891B2 (en) * 2015-03-23 2017-03-21 Jk Worldwide Enterprises Inc. Thermal break for use in construction
US10787809B2 (en) * 2015-03-23 2020-09-29 Jk Worldwide Enterprises Inc. Thermal break for use in construction
US9863137B2 (en) * 2015-03-23 2018-01-09 Jk Worldwide Enterprises Inc. Thermal break for use in construction
WO2018207109A1 (fr) * 2017-05-11 2018-11-15 Eggenweiler Florian N Dispositif de connexion pour barres de stores
US12049765B2 (en) 2021-07-20 2024-07-30 Life Coded, Llc Portable hot swaged coupling device for connecting articles

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JPH09228556A (ja) * 1996-02-20 1997-09-02 Mineichi Iwamoto 棒状体の継手
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JPH09228556A (ja) * 1996-02-20 1997-09-02 Mineichi Iwamoto 棒状体の継手
WO2002064907A1 (fr) * 2001-02-14 2002-08-22 Yong-Keun Kim Accouplement de barres d'armature

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11293182B2 (en) 2016-09-12 2022-04-05 Coupler Solutions Limited Coupling device, associated parts and a method of use thereof
US11332935B2 (en) 2016-09-12 2022-05-17 Coupler Solutions Limited Coupling device, associated parts and a method of use thereof
US11773595B2 (en) 2016-09-12 2023-10-03 Coupler Solutions Limited Coupling device, associated parts and a method of use thereof
IT201700069007A1 (it) * 2017-06-21 2018-12-21 Tecnaria S P A Dispositivo per la giunzione meccanica di barre di acciaio
US20230057280A1 (en) * 2021-08-23 2023-02-23 Jeffrey Marshall Impalement hazard protective cap
US11988001B2 (en) * 2021-08-23 2024-05-21 Jeffrey Marshall Impalement hazard protective cap

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Publication number Publication date
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