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EP3561195B1 - Gerippter bewehrungsstab - Google Patents

Gerippter bewehrungsstab Download PDF

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Publication number
EP3561195B1
EP3561195B1 EP18732226.8A EP18732226A EP3561195B1 EP 3561195 B1 EP3561195 B1 EP 3561195B1 EP 18732226 A EP18732226 A EP 18732226A EP 3561195 B1 EP3561195 B1 EP 3561195B1
Authority
EP
European Patent Office
Prior art keywords
bar
reinforcing bar
protuberances
transverse
reinforcing
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.)
Active
Application number
EP18732226.8A
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English (en)
French (fr)
Other versions
EP3561195A4 (de
EP3561195A2 (de
Inventor
Igor Nikolaevich Tikhonov
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.)
Egorov Dmitrii Ivanovich
Kuzmenko Nadezhda Victorovna
Tikhonov Georgy Igorevich
TIKHONOV, IGOR NIKOLAEVICH
Tikhonova Anna Igorevna
Yatsyuk Sergey Vasilevich
Original Assignee
Egorov Dmitrii Ivanovich
Kuzmenko Nadezhda Victorovna
Tikhonov Georgy Igorevich
Tikhonova Anna Igorevna
Yatsyuk Sergey Vasilevich
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.)
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Application filed by Egorov Dmitrii Ivanovich, Kuzmenko Nadezhda Victorovna, Tikhonov Georgy Igorevich, Tikhonova Anna Igorevna, Yatsyuk Sergey Vasilevich filed Critical Egorov Dmitrii Ivanovich
Publication of EP3561195A2 publication Critical patent/EP3561195A2/de
Publication of EP3561195A4 publication Critical patent/EP3561195A4/de
Application granted granted Critical
Publication of EP3561195B1 publication Critical patent/EP3561195B1/de
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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

Definitions

  • This invention relates to the building art, and more particularly to structural concrete reinforcing bars, as well as to ground anchors, formwork fasteners, pipeline fasteners, and other construction components.
  • One known spiral-shaped reinforcing bar comprises a circular cross-section core and two rows of inclined transverse ribs (protuberances) that are arranged on its surface and extend along a single-start right-hand or left-hand spiral line /1/.
  • Another known ribbed reinforcing bar has on its surface oppositely arranged longitudinal ribs and spirally oriented inclined ribs which at their one end are adjacent to the longitudinal ribs and at the other end are gapped therefrom, the inclined ribs' adjunction to each longitudinal rib is being provided with alternating gaps between them, the gaps amounting to 0.15 to 0.3 of the distance between the longitudinal ribs along the bar cross-section arc /2/.
  • This approach is disadvantageous in that there are longitudinal ribs and intersections between the longitudinal and the inclined ribs.
  • the longitudinal ribs reduce the strength of bond to the concrete due to the inclined ribs' reduced surface area in contact with the concrete and prevent formation of a spiral thread on the bar surface, which could have been used for the bar splicing and anchoring with sockets and nuts. Concentration of stresses when dynamic loads are applied to the bars at the intersections between the longitudinal and the inclined ribs reduces their strength under alternate and cyclic loads.
  • a reinforcing bar with four rows of ribs, where the peaks of adjacent rows of crescent-shaped transverse protuberances are arranged in mutually perpendicular axial planes with an angle of the core surface coverage by a protuberance of 140 to 180° and a ratio of the transverse protuberance maximum height to pitch of 0.12 to 0.3 /3/.
  • transverse protuberances in the adjacent rows are distinct in their form and their peaks are arranged in mutually perpendicular horizontal (x) and vertical (y) coordinate axial planes of the bar.
  • the bar's horizontal axis (x) coincides with the reinforcing bar horizontal axial rolling plane, resulting in formation of longitudinal ribs that reduce the relative rib area of transverse ribs in these rows (according to G. Rehm criterion) separating them into two half-crescents with a lesser total area, reducing cyclic and dynamic load strength, and preventing formation of a spiral thread for screwing on splicing sockets and retainer nuts on the bar surface.
  • a further reinforcing bar is known from EP 1 231 331 A2 .
  • the disclosed reinforcing bar has ribs whose angle of inclination ⁇ to the longitudinal axis of the reinforcing bar is 25 to 55°, preferably 37 to 42°, wherein the rib head width b is greater than 0.2 times and preferably less than 0.5 times the nominal diameter, and wherein the ratio of the rib width in the longitudinal direction b' to the rib spacing c in the direction of the axis of the reinforcing bar is greater than 0.35, and the degree of rib coverage is greater than 45%, preferably greater than 50%, more preferably greater than 55%.
  • the low rib inclination angle ⁇ relative to the reinforcing bar axis has several advantages: Investigations have shown that significantly improved fatigue properties can be achieved with such a low rib inclination angle, i.e. fatigue fracture of the reinforcing steel occurs less frequently or only after a longer period of time than with a conventional reinforcing bar with a larger rib inclination angle. In the case of the reinforcing bar with a reduced rib inclination angle, there are fewer prominent edges in the longitudinal direction of the reinforcing bar. As a result, there is less excess stress or notch stress in the reinforcing steel and in the concrete, which usually occurs at such edges.
  • the inclined position results in a smaller slope in the direction of the longitudinal axis than in the case of a rib with the same height but a larger rib inclination angle. In this way, excess stresses or the notch effect of the reinforcing bar can be reduced. Furthermore, the surface distribution on the coating of the reinforcing bar in the direction of the longitudinal axis is more uniform than in the case of a ribbed reinforcing bar with a steeper rib inclination angle.
  • the technical problem is to provide a ribbed circular cross-section reinforcing bar without longitudinal ribs, with inclined crescent-shaped equiform transverse ribs uniformly arranged on the bar surface for efficient bonding between the reinforcing bars and the concrete, and to enable formation of a spiral threaded shape by rolling in a two-high mill.
  • a ribbed reinforcing bar having a circular cross-section core and inclined open crescent-shaped transverse protuberances arranged along its surface in four rows, produced by rolling in a two-high mill without longitudinal rib formation, the peaks of the transverse protuberances being arranged in a checkerboard fashion along a spiral line over the core surface, the peaks of adjacent longitudinal rows of transverse protuberances being situated in the bar's inclined axial planes whose adjoining angles of inclination to the axial planes, coinciding with the reinforcing bar rolling axes, are 20° to 70°, preferably 45°.
  • the crescent-shaped transverse protuberances are arranged on the core surface such as to form a screw thread.
  • its transverse protuberances' dimensions are defined in height by outer circular contours with the radii of 0.5 to 0.6d whose centers are displaced from the bar core symmetry axes to a distance of 0.07 to 0.1d.
  • the reinforcing bar of the present invention is different from the prior art in that it is produced by rolling in a two-high mill without longitudinal rib formation, the peaks of the transverse protuberances are arranged in a checkerboard fashion along a spiral line over the core surface, the peaks of adjacent longitudinal rows of transverse protuberances being situated in the bar's inclined axial planes whose adjoining angles of inclination to the axial planes, coinciding with the reinforcing bar rolling axes, are 20° to 70°, preferably 45°.
  • the reinforcing bar is configured such that the transverse crescent-shaped protuberances form a screw thread on its surface.
  • its transverse protuberances' dimensions are defined in height by outer circular contours with the radii of 0.5 to 0.6d whose centers are displaced from the bar core symmetry axes to a distance of 0.07 to 0.1d.
  • the reinforcing bar produced by rolling in a two-high mill is ribbed without longitudinal ribs, with the transverse protuberance peaks of the same asymmetric crescent-like shape arranged in a checkerboard fashion, wherein the maxim height points, i.e. the peaks of adjacent longitudinal rows of transverse protuberances, lie in the bar's inclined axial planes whose adjoining angles ( ⁇ ) of inclination to the bar rolling horizontal (x) and vertical (y) axial planes are 20 0 to 70 0 .
  • the axial planes' inclination angle is preferably 45°, and the transverse protuberances are arranged over the core surface such as to form a screw thread configuration.
  • the technical result consists in providing optimal conditions for the reinforcing bar bonding with the concrete through reducing the thrusting forces by evenly distributing the transverse protuberances over the bar surface, in improved cyclic and short-term dynamic load strength due to the absence of longitudinal protuberances and, therefore, their intersections with transverse protuberances, in the possibility to mechanically splice and anchor the bars, without welding or overlapping, via threaded screw sockets and nuts, and the possibility to produce the bars using the two-high rolling mill process commonly used for reinforcing bar production.
  • Fig. 1 shows a ribbed reinforcing bar
  • Fig. 2 is View A of Fig. 1
  • Figs. 3 , 4 , 5 show View B of Fig. 1 (reinforcing bar embodiments with various angles ⁇ ).
  • a reinforcing bar has a core 1 with a circular cross-section and the diameter d, transverse protuberances 2 with the maximum height h max and a coverage angle smaller than 180°, whose peaks 3 are arranged along the bar in a checkerboard fashion along a spiral line with the pitch t.
  • the peaks 3 (the maximum height points) of adjacent transverse protuberances lie in the bar's inclined axial planes whose adjoining angles ( ⁇ x and ⁇ y ) to the horizontal (x) 4 and vertical (y) 5 axes of the bar's longitudinal axial rolling plane are 20 0 to 70°, preferably 45°.
  • the crescent-shaped transverse protuberances are arranged over the core surface such as to form a screw thread configuration. (ref. to Fig. 1 , Fig. 2 ).
  • the parameter commonly used to evaluate a ribbed reinforcing bar efficiency in terms of bonding with concrete is the relative area of reinforcing bar rib bearing on concrete or the G.
  • the reinforcing bar efficiency in terms of the strength of its bond with concrete may be improved by increasing the h value, by displacing the rib peaks with respect to the cross-section axes x and y, and/or by reducing the pitch t.
  • the protuberances along the length of one pitch in the projection on a plane normal to the bar's longitudinal axis are of a crescent-like asymmetric shape ( Figs. 3 , 4 , 5 ).
  • Asymmetric shape of the crescent-like transverse ribs of the present invention with adjacent ribs' peaks situated on opposite sides with respect to the x axis ( Fig. 3 , 4 , 5 ) of the horizontal axial reinforcing bar rolling plane allows spiral reinforcing bars to be produced by the hot rolling process which is common in the metals industry and uses two-high mills, in particular that used for rolling single-start spiral bars without longitudinal ribs /1/.
  • the peaks of asymmetric equiform ribs are arranged with respect to each other over the bar core surface in a checkerboard fashion, thus making it possible to change, with various positions of the peaks relative to the x and y axes, the ribs' configuration, to minimize their thrusting action by distributing them over the reinforcing bar perimeter and length while retaining a high level of the f R value, and, therefore, to provide for the required strength, firmness and reliability of bonding between the bar and the concrete, specifically in its plastic deformation area, to improve reinforced concrete structure reliability.
  • the transverse protuberances they are arranged along a discontinuous spiral line such as to form a bar surface configuration suitable for providing threaded connections with sockets and end anchor nuts.
  • the transverse protuberances shall be defined in height by outer circular contours with the radii of 0.5 to 0.6d whose centers are displaced from the bar core symmetry axes to a distance of 0.07 to 0.1d.
  • optimum engagement of the bar shape with sockets and nuts' threads and bonding with concrete will be provided. Due to the absence of longitudinal ribs on the bar surface and of their intersections with transverse ribs, as well as the absence of any stress concentration locations, the reinforcing bars' fatigue strength is improved.
  • threaded splice connections may be provided along the bar length via sockets, and end anchors may be provided in the form of reusable nuts with low thrusting action and, therefore, high strength.
  • Finishing passes for the new reinforcing bars shall be cut on the roll groove surface by milling transverse recesses at both sides of a groove such as to arrange neighboring recesses in a checkerboard fashion along the groove length and to provide the necessary constant angle of recess inclination relative to the groove longitudinal axis.
  • the transverse recesses may be milled either in a row-by-row, or in a mixed manner.
  • the thread-like spiral shape of the bars is provided by synchronized rotation of rolls within a stand during rolling.
  • the amount of metal necessary to form the thread may be reduced and the threaded connection strength may be increased due to an increased contact surface evenly distributed over the perimeter and length.
  • reinforcing bars of this type may be provided with weldless connections via threaded sockets and may be anchored via nuts. Screw-shaped reinforcing bars may also be widely used as ground anchors, formwork panel tie members for cast-in-place construction, and as anchoring and fastening members for various process and household applications. It is proposed to produce reinforcing bars of the new type according to the present invention on a large scale to substitute the existing types of ribbed reinforcing bars.
  • the ribbed reinforcing bar of the present invention is configured and geometrically arranged such as to improve interaction between the reinforcing bars and the concrete within a finished structure, to improve ribbed reinforcing bars' functional capabilities and to expand their application fields.
  • the novel reinforcing bar meets the requirements to manufacturability applicable in the rolled product and hardware production industries, as well as those applicable to reinforcement installation and other operations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Piles And Underground Anchors (AREA)

Claims (4)

  1. Ein gerippter Bewehrungsstab mit einem Kern (1) mit kreisförmigem Querschnitt und geneigten, offenen, sichelförmigen Quervorsprüngen (2), die entlang seiner Oberfläche in vier Reihen angeordnet sind, wobei
    Scheitelpunkte (3) der Quervorsprünge (2) schachbrettartig entlang einer spiralförmigen Linie über der Kernoberfläche angeordnet sind,
    die Scheitelpunkte (3) benachbarter Längsreihen von Quervorsprüngen (2) in den geneigten Axialebenen des Stabes liegen, deren aneinandergrenzende Neigungswinkel zu den Axialebenen, die mit den Rollachsen des Bewehrungsstabes zusammenfallen, 20° bis 70° betragen,
    dadurch gekennzeichnet, dass
    der Bewehrungsstab durch Walzen in einem Duo-Walzwerk ohne Längsrippenbildung hergestellt ist, wobei die geneigten, offenen, sichelförmigen Quervorsprünge (2) auf der Kernoberfläche so angeordnet sind, dass sie ein Schraubgewinde bilden, das zum Verankern und Verbinden von Bewehrungsstäben geeignet ist.
  2. Bewehrungsstab nach Anspruch 1, dadurch gekennzeichnet, dass die Scheitelpunkte (3) benachbarter Längsreihen der Quervorsprünge (2) in den geneigten Axialebenen des Stabes liegen, deren benachbarte Neigungswinkel zu den Axialebenen, die mit den Bewehrungsstab-Rollachsen zusammenfallen, vorzugsweise 45° betragen.
  3. Bewehrungsstab nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Quervorsprünge (2) in der Höhe durch äußere kreisförmige Konturen mit den Radien 0,5 bis 0,6d definiert sind, deren Mittelpunkte in einem Abstand von 0,07 bis 0,1d zu den Stabkernsymmetrieachsen versetzt sind.
  4. Bewehrungsstab nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass die Vorsprünge (2) entlang der Länge einer Teilung in der Projektion auf eine Ebene senkrecht zur Stablängsachse eine sichelförmige, asymmetrische Form aufweisen.
EP18732226.8A 2016-12-23 2018-02-21 Gerippter bewehrungsstab Active EP3561195B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2016150953A RU2680153C2 (ru) 2016-12-23 2016-12-23 Арматурный стержень периодического профиля
PCT/RU2018/000103 WO2018117916A2 (ru) 2016-12-23 2018-02-21 Арматурный стержень периодического профиля

Publications (3)

Publication Number Publication Date
EP3561195A2 EP3561195A2 (de) 2019-10-30
EP3561195A4 EP3561195A4 (de) 2020-11-11
EP3561195B1 true EP3561195B1 (de) 2022-03-30

Family

ID=62627509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18732226.8A Active EP3561195B1 (de) 2016-12-23 2018-02-21 Gerippter bewehrungsstab

Country Status (5)

Country Link
EP (1) EP3561195B1 (de)
CN (1) CN110392759A (de)
EA (1) EA037229B1 (de)
RU (1) RU2680153C2 (de)
WO (1) WO2018117916A2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115754211B (zh) * 2021-01-04 2024-08-23 广西柳钢华创科技研发有限公司 加强带肋钢筋强度的方法
WO2025239789A1 (ru) * 2024-05-14 2025-11-20 Общество С Ограниченной Ответственностью "Металлопрокатный Завод" Арматурный стержень периодического профиля

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
DE2704819C2 (de) * 1977-02-05 1985-03-21 Dyckerhoff & Widmann AG, 8000 München Betonbewehrungsstab mit schraubenlinienförmig verlaufenden und Teile eines Gewindes bildenden Rippen
SU1188287A2 (ru) * 1984-05-11 1985-10-30 Челябинский Политехнический Институт Им.Ленинского Комсомола Арматурный стержень периодического профил
SU1325151A1 (ru) 1986-03-26 1987-07-23 Днепропетровский Металлургический Институт Им.Л.И.Брежнева Арматурный стержень периодического профил
FR2647372A1 (fr) * 1989-05-26 1990-11-30 Acor Const Rationalises Fil d'acier nervure a haute adherence et son procede de fabrication
DE10105667A1 (de) * 2001-02-08 2002-09-26 Badische Stahlwerke Gmbh Betonstahl mit Rippen, Stahlbeton
CN2529934Y (zh) * 2002-03-13 2003-01-08 吴英剑 高强冷轧带肋钢筋
RU2252991C2 (ru) 2003-07-03 2005-05-27 Государственное унитарное предприятие "Научно-исследовательский, проектно-конструкторский и технологический институт бетона и железобетона " (ГУП "НИИЖБ") Арматурный стержень периодического профиля
UA82725C2 (uk) * 2003-07-03 2008-05-12 Федеральное Государственное Унитарное Предприятие "Научно-Исследовательский Центр "Строительство" Арматурний стержень періодичного профілю
RU69540U1 (ru) * 2007-01-18 2007-12-27 Крылов Владимир Иванович Арматурный стержень периодического профиля
CN201474174U (zh) * 2009-08-05 2010-05-19 江阴市华金交通建材有限公司 三面带肋钢筋焊接网
CN101942887A (zh) * 2010-09-09 2011-01-12 天津市建科机械制造有限公司 四面带肋钢筋
CN204152087U (zh) * 2014-08-25 2015-02-11 江苏永钢集团有限公司 防止制箍时翘曲的公称直径不超过20mm的螺纹钢筋
RU2602251C1 (ru) * 2015-09-09 2016-11-10 Акционерное общество "Научно-исследовательский центр "Строительство", АО "НИЦ "Строительство" Арматурный стержень периодического профиля
CN106049763B (zh) * 2016-07-27 2018-08-31 中国建筑第八工程局有限公司 横肋错开的带肋钢筋

Also Published As

Publication number Publication date
EA037229B1 (ru) 2021-02-24
EA201900335A1 (ru) 2019-11-29
RU2016150953A (ru) 2018-06-25
RU2016150953A3 (de) 2018-07-20
RU2680153C2 (ru) 2019-02-18
EP3561195A4 (de) 2020-11-11
CN110392759A (zh) 2019-10-29
WO2018117916A3 (ru) 2018-08-02
EP3561195A2 (de) 2019-10-30
WO2018117916A2 (ru) 2018-06-28

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