EP0171965B1 - Procédé pour la réalisation de raccords pour barres de renforcement et jonctions et raccords pour de telles barres - Google Patents

Procédé pour la réalisation de raccords pour barres de renforcement et jonctions et raccords pour de telles barres Download PDF

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Publication number
EP0171965B1
EP0171965B1 EP19850305382 EP85305382A EP0171965B1 EP 0171965 B1 EP0171965 B1 EP 0171965B1 EP 19850305382 EP19850305382 EP 19850305382 EP 85305382 A EP85305382 A EP 85305382A EP 0171965 B1 EP0171965 B1 EP 0171965B1
Authority
EP
European Patent Office
Prior art keywords
bar
screw
thread
end portion
threaded
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
EP19850305382
Other languages
German (de)
English (en)
Other versions
EP0171965A2 (fr
EP0171965A3 (en
Inventor
Christopher Robin Edwards
Michael Stephen Wright
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.)
ASW Ltd
Original Assignee
Allied Steel and Wire 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 Allied Steel and Wire Ltd filed Critical Allied Steel and Wire Ltd
Publication of EP0171965A2 publication Critical patent/EP0171965A2/fr
Publication of EP0171965A3 publication Critical patent/EP0171965A3/en
Application granted granted Critical
Publication of EP0171965B1 publication Critical patent/EP0171965B1/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
    • E04C5/16—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 invention relates to a method of forming a connection for the end portion of a rolled steel reinforcing bar, to a screw-threaded joint between such bars and to other screw-threaded terminations for such bars.
  • Deformed bar is bar which has surface deformations which cause a deviation from a circular cross section and cause irregularities such as transverse ribs which might be inclined to a circumferential line and provide means whereby concrete poured around the bar is locked to the bar against relative axial movement.
  • deformed reinforcing bar or “deformed bar” is intended to refer to such bar as described above.
  • reinforcing bar joint incorporates deformations along the whole length of the bar which are made in such a manner that they can act as a coarse screw thread.
  • GB-A-1 546 824 See GB-A-1 546 824.
  • additional means such as lock nuts, torque loaded to induce bedding of the threads are used.
  • a method of providing a connection for the end portion of a rolled steel deformed bar including the step of rolling a screw-thread in a generally circumferential direction on an end portion of a deformed bar having a non-circular core and ribs projecting from the core, the rolling being carried out in such a manner that the screw-thread is discontinuous insofar as regions of the screw- threaded end portion are without thread or have thread of insufficient depth to carry substantial load.
  • the effect of rolling a screw thread on to a deformed bar is to produce a full depth or substantially full depth screw thread with crests and troughs in some regions while a less deep and incompletely formed screw thread is formed over other parts of the surface of the bar.
  • a thread rolling operation normally produces an accurate screw thread and the screw thread in accordance with the invention is accurate except in that portions thereof are missing or only partly formed. It has been discovered that thread rolling a typical deformed bar produces sufficient screw thread to provide effective contact with the corresponding screw threads of another member so that the threads bed firmly together and do not suffer from excessive elongation under load.
  • a screw-threaded joint between two lengths of deformed rolled steel reinforcing bar comprising an internally screw-threaded sleeve open at both ends and an externally threaded end portion of each of the lengths of bar engaged in the sleeve, wherein the threads on the bar have been rolled directly onto the previously deformed surface of a bar having a non-circular core and transverse ribs projecting from the core, the threads being rolled in such a manner that the screw thread is discontinuous insofar as regions of the screw-threaded end portion are without thread or have thread of insufficient depth to carry substantial load.
  • a screw-threaded termination for a rolled steel reinforcing bar comprising an externally threaded end portion of the bar, a plate carried by the bar and a nut screw threaded to the end portion of the bar to hold the plate in position, wherein the screw thread on the bar has been formed by rolling directly onto the previously deformed surface of a bar having a non-circular core and transverse ribs projecting from the core, the threads being rolled in such a manner that the screw thread is discontinuous insofar as regions of the screw-threaded end portion are without thread or have thread of insufficient depth to carry substantial load.
  • the unmachined bar is subject to a thread rolling operation by thread rolling equipment incorporating three rotary dies set to roll a thread on a bar with a diameter intermediate between D and d.
  • This thread rolling operation results in a fully formed or substantially fully formed thread at two diametrically opposed regions associated with the lines 12 and 13 as shown in figure 1 and also produces a very shallow and only partially formed thread at regions such as 14 where the bar has a smaller transverse dimension. In some cases there may even be no thread at all in the regions 14. There is a tendency for a few threads to be formed completely around the whole or a major part of the circumference of the bar in the region of the crests of the ribs 11, as indicated at 15. Due to the circumferential spreading of the ribs during the rolling operation, the well formed thread extends slightly beyond the original position of the rib itself. A preferred threadform is illustrated in figure 5 and incorporates a relatively wide shallow root 20 and a relatively sharp narrow crest 21. This type of thread facilitates rolling and' leads to good fatigue strength.
  • Figure 6 shows one possible use of the bar with a thread rolled on its end and also provides a pictorial representation of the screw thread.
  • the bar may be used as a rock anchor in which case it is secured in a hole in a rock surface by means such as grout in the usual way.
  • a nut 22 serves to hold a plate 23 against a rock surface (not shown) so that the plate tends to hold rock near the surface in position, taking load on a part of the rock remote from the surface by virtue of the bar being anchored in its hole. The nut is tightened to a desired tension in order to hold the surface rock in position.
  • FIG 7 shows an internally screwthreaded steel sleeve 16 within which two bars 17 and 18 have been engaged.
  • the bars 17 and 18 each correspond to the screw- threaded bar shown in figures 1 to 5.
  • the effective threaded areas are indicated by shading and those areas where there is only a shallow thread or no effective thread are left unshaded.
  • the two bars 17 and 18 have flat ends, and a spacer disc 19 is positioned between them.
  • the two bars can be screwed in to the sleeve 16 until they abut tightly against the spacer disc, thereby ensuring that even when there is no external load on the bars 17 and 18, the threads of the bars are firmly engaged against the threads of the sleeve in a direction corresponding to tensile loading.
  • the threads are not continuous, there is sufficient area of thread to ensure positive bedding of each bar against the sleeve.
  • the extension at the joint may be no more than the elastic extension arising in a corresponding length of reinforcing bar remote from the joint.
  • the tensile strength of the bar at the joint remains substantially the same as that of the bar as a whole because there is no loss of material as a result of the thread rolling. It appears that the discontinuities in the thread in the bars does not result in excessive stress concentrations and presumably because of this the fatigue strength of the joint is particularly good.
  • the invention has been described in relation to a bar having an oval core, it may also be applied to other forms of deformed bar including bars with non-circular cores.

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)

Claims (4)

1. Procédé consistant à former un raccordement pour la portion terminale d'une barre déformée en acier laminé (selon la définition donnée dans le présent mémoire), caractérisé par la phase consistant à rouler un filetage (14, 15) dans une direction générale circonférentielle sur une partie terminale d'une barre déformée possédant un noyau non circulaire (10) et des nervures (11) qui font saillie sur le noyau, le roulage étant exécuté de telle manière que le filetage soit discontinu en ce sens que certaines régions (14) de la partie terminale filetée sont dépourvues de filet ou ont un filet d'une profondeur insuffisante pour résister à un effort notable.
2. Longueur de barre d'armature en acier laminé déformée (selon la définition donnée dans le présent mémoire), caractérisée par une partie terminale filetée extérieurement, discontinue, formée par un procédé selon la revendication 1.
3. Joint fileté entre deux longueurs (17, 18) de barres d'armature en acier laminé déformées (selon la définition donnée dans le présent mémoire) qui comprend un manchon fileté intérieurement (16), ouvert à ses deux extrémités, et une partie terminale filetée extérieurement de chacune de deux longueurs de barres vissée dans le manchon, caractérisé en ce que les filets de la barre ont été roulés directement sur la surface antérieurement déformée d'une barre qui possède un noyau non circulaire (10) et des nervures transversales (11) en saillie sur le noyau, les filets étant roulés de telle manière que le filetage soit discontinue en ce sens que certaines régions (14) de la partie terminale filetée sont dépourvues de filet ou ont un filet d'une profondeur insuffisante pour résister à un effort notable.
4. Terminaison filetée pour une barre d'armature en acier laminé (selon la définition donnée dans le présent mémoire), qui comprend une partie terminale filtée extérieurement de la barre, une plaque (23) portée par le fer et un écrou (22) vissé sur la partie terminale de la barre pour maintenir la plaque en position, caractérisée en ce que le filetage de la barre a été formé en roulant directement sur la surface antérieurement déformée d'une barre qui possède un noyau non circulaire (10) et des nervures transversales (11) en saillie sur le noyau, les filets étant roulés de telle manière que le filetage soit discontinu en ce sens que certaines régions (14) de la partie terminale filetée sont dépourvues de filet ou ont un filet d'une profondeur insuffisante pour supporter un effort notable.
EP19850305382 1984-08-09 1985-07-29 Procédé pour la réalisation de raccords pour barres de renforcement et jonctions et raccords pour de telles barres Expired - Lifetime EP0171965B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08420285A GB2162915B (en) 1984-08-09 1984-08-09 Reinforcing bar joints
GB8420285 1984-08-09

Publications (3)

Publication Number Publication Date
EP0171965A2 EP0171965A2 (fr) 1986-02-19
EP0171965A3 EP0171965A3 (en) 1987-02-04
EP0171965B1 true EP0171965B1 (fr) 1990-07-04

Family

ID=10565122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850305382 Expired - Lifetime EP0171965B1 (fr) 1984-08-09 1985-07-29 Procédé pour la réalisation de raccords pour barres de renforcement et jonctions et raccords pour de telles barres

Country Status (7)

Country Link
EP (1) EP0171965B1 (fr)
JP (1) JPH06102233B2 (fr)
AU (1) AU578964B2 (fr)
DE (1) DE3578537D1 (fr)
GB (1) GB2162915B (fr)
HK (1) HK62193A (fr)
ZA (1) ZA855837B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG112795A1 (en) * 1998-03-31 2005-07-28 Gyeng Ok Chung Method of working connection end of deformed bar for reinforcing concrete, deformed bar worked by the method and structure of connecting deformed bar
CN103452246B (zh) * 2013-07-09 2016-08-10 中国建筑股份有限公司 一种钢筋浆锚对接连接的灌浆变形钢管套筒

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU587561B2 (en) * 1986-07-16 1989-08-17 Broken Hill Proprietary Company Limited, The Production of threaded bar
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
GB2238499A (en) * 1989-11-09 1991-06-05 Hy Ten Reinforcement Company L Forming threaded bars
FI922525A0 (fi) * 1992-06-01 1992-06-01 Tartuntamarkkinointi Oy Foerfarande foer skaerning av en gaenga i en staong.
WO1994007619A1 (fr) * 1992-09-25 1994-04-14 Bhp Engineering Pty. Ltd. Barres creuses et procede pour leur fabrication
KR100248963B1 (ko) * 1998-03-31 2000-03-15 정경옥 콘크리트 보강용 이형봉강의 연결부 구조와 그 연결부의 가공방법
DE59900345D1 (de) * 1999-04-22 2001-11-29 Ancotech Ag Dielsdorf Verfahren zur Herstellung eines mit einem Aussengewinde versehenen Armierungsstabes
AU6008099A (en) * 1999-09-27 2001-04-30 Gyeng Ok Chung Method of processing connecting ends of deformed steel bar used for reinforcing concrete, and deformed steel bar processed by this method
JP4236780B2 (ja) * 1999-11-01 2009-03-11 東京鐵鋼株式会社 異形鉄筋定着構造の形成方法
AUPS266202A0 (en) * 2002-05-30 2002-06-20 Industrial Rollformers Pty Limited Threaded bar
CN101554697B (zh) * 2008-08-27 2012-05-23 建研科技股份有限公司 一种提高钢筋接头抗变形能力的螺纹加工装置
CN103276853B (zh) * 2013-05-10 2016-08-24 周兆弟 预应力混凝土构件钢筋联接扣及连接方法

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DE1026509B (de) * 1952-06-16 1958-03-20 Duesseldorfer Eisenhuettengese Vorrichtung zum Verankern von Spannstaeben mit Endgewinde, insbesondere fuer Spannbeton-Eisenbahnschwellen
DE1194552B (de) * 1961-06-26 1965-06-10 Beton & Monierbau Ag Zugbolzenmuffe zum Anschluss an walzprofilierte Vorspannstaebe mit kreisrundem Kernquerschnitt
US3415552A (en) * 1966-11-29 1968-12-10 Howlett Machine Works Splicing metallic reinforcing rods with a threaded coupling sleeve
US3492908A (en) * 1969-01-17 1970-02-03 Microdot Inc Thread swaging screw or bolt
JPS523297Y2 (fr) * 1972-08-31 1977-01-24
US3928998A (en) * 1973-11-28 1975-12-30 Aurelio Leonardo Francisco Metal rod for reinforced concrete and process for producing said rod
JPS5412894Y2 (fr) * 1974-09-05 1979-06-04
US3942406A (en) * 1974-10-07 1976-03-09 Textron Inc. Slab-sided self-tapping screw
JPS521918A (en) * 1975-06-23 1977-01-08 Kobe Steel Ltd Special form steel bar for strengthening concrete
JPS5318214A (en) * 1976-07-31 1978-02-20 Konoikegumi Kk Method of joining reinforcement
BE874197A (nl) * 1979-02-15 1979-05-29 Penen Jozef Werkwijze voor het aanbrengen van een mofverbinding tussen bewapeningsstaven en analoge staven en hierbij gebruikte sleutel
JPS55136899U (fr) * 1979-03-20 1980-09-29
JPS5613566A (en) * 1979-07-13 1981-02-09 Fujitsu Ltd Generating circuit for track-crossing pulse
AU536627B2 (en) * 1980-08-22 1984-05-17 Dywidag-Systems International Pty. Limited Bar
JPS5837259A (ja) * 1981-08-29 1983-03-04 住友金属工業株式会社 ねじ鉄筋の継手工法
JPS5894546A (ja) * 1981-11-30 1983-06-04 新日本製鐵株式会社 鉄筋の接続方法
JPS5927299U (ja) * 1982-08-10 1984-02-20 北越メタル株式会社 ロツクボルト
JPS5930441U (ja) * 1982-08-19 1984-02-25 三菱重工業株式会社 コンクリ−ト構造物
BE895952A (nl) * 1983-02-18 1983-06-16 Penen & Co N V J Mofverbinding tussen de van schroefdraad voorziene uiteinden van bewapeningsstaven of gelijkaardige staven
JPS59222612A (ja) * 1983-05-31 1984-12-14 大同特殊鋼株式会社 棒鋼接合構造

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG112795A1 (en) * 1998-03-31 2005-07-28 Gyeng Ok Chung Method of working connection end of deformed bar for reinforcing concrete, deformed bar worked by the method and structure of connecting deformed bar
CN103452246B (zh) * 2013-07-09 2016-08-10 中国建筑股份有限公司 一种钢筋浆锚对接连接的灌浆变形钢管套筒

Also Published As

Publication number Publication date
JPH06102233B2 (ja) 1994-12-14
JPS6171142A (ja) 1986-04-12
ZA855837B (en) 1986-03-26
DE3578537D1 (de) 1990-08-09
AU578964B2 (en) 1988-11-10
GB2162915B (en) 1988-06-02
GB2162915A (en) 1986-02-12
EP0171965A2 (fr) 1986-02-19
AU4573685A (en) 1986-02-13
HK62193A (en) 1993-07-09
GB8420285D0 (en) 1984-09-12
EP0171965A3 (en) 1987-02-04

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