EP2000609A1 - Barre d'armature - Google Patents

Barre d'armature Download PDF

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Publication number
EP2000609A1
EP2000609A1 EP08008805A EP08008805A EP2000609A1 EP 2000609 A1 EP2000609 A1 EP 2000609A1 EP 08008805 A EP08008805 A EP 08008805A EP 08008805 A EP08008805 A EP 08008805A EP 2000609 A1 EP2000609 A1 EP 2000609A1
Authority
EP
European Patent Office
Prior art keywords
ribs
rib
reinforcing bar
different
material properties
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Withdrawn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
EP08008805A
Other languages
German (de)
English (en)
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.)
Schoeck Bauteile GmbH
Original Assignee
Schoeck Bauteile GmbH
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 Schoeck Bauteile GmbH filed Critical Schoeck Bauteile GmbH
Publication of EP2000609A1 publication Critical patent/EP2000609A1/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Withdrawn legal-status Critical Current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
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • 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, i.e. of essentially one-dimensional [1D] or two-dimensional [2D] extent
    • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance, i.e. of essentially one-dimensional [1D] or two-dimensional [2D] extent with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete

Definitions

  • the invention relates to a reinforcing rod made of fiber-reinforced plastic, provided on its peripheral surface with a radially outwardly projecting profiling in the form of at least over part of the circumference extending ribs.
  • the lateral rib flanks of the ribs of the reinforcing bar should be inclined at an angle of more than 45 ° with respect to the bar axis and that the axial width of the ribs should be greater than the distance between two adjacent ribs.
  • ribs if they do not protrude radially, starting from an inner lateral surface with a smaller diameter to the outside, but also if - as in the case of the incised thread - consist of a part of the rod lateral surface and through this lateral surface introduced recesses are formed.
  • a thread geometry is defined in which the concrete brackets, ie the concrete located adjacent to the bar in the area between two adjacent ribs, fail up to a certain concrete strength between the ribs.
  • a disadvantage of this thread form is that at a higher concrete strength, the ribs shear off completely and thereby the residual composite stress drops drastically. As concrete hardens more and more with increasing aging, this can lead to an abrupt failure of the reinforcement even after a long undamaged time when a threshold value is exceeded.
  • GRP reinforcing bars made of fiber-reinforced plastic
  • GRP reinforcing bars have a lower modulus of elasticity than steel and thus wider cracks in GRP-reinforced concrete structures are to be expected compared to reinforced concrete structures
  • steel reinforcement rods are currently also generally used.
  • the present invention seeks to provide a reinforcing rod made of fiber-reinforced plastic of the type mentioned above, which is characterized by improved properties and is particularly suitable for receiving higher loads. Accordingly, a reinforcing rod made of fiber-reinforced plastic is to be made available in particular, which avoids the disadvantage of conventional GRP reinforcing rods and, for example, helps to reduce the crack spacing and the crack width in the concrete surrounding the reinforcing rod. In this case, instead of some large gaping cracks in the concrete, it is expedient to produce a plurality of smaller cracks, which then, in addition to a better visual impression, also result in improved ductility of the concrete component.
  • the reinforcing rod has ribs with different geometric and / or material properties.
  • an order system of different rib properties can be formed, in which the ribs of different order with respect to the geometric parameters such as rib width, rib spacing, rib depth, angle of the rib flanks, rib division etc. or by varying the glass fiber content, the fiber materials, the fiber orientations, etc. differ and their Properties can complement.
  • the ribs with different geometric and / or material properties are formed so that they have a different shear stress on the ribbed bottom.
  • the said order system of different rib properties advantageously leads to a distinction with regard to the respective rib loads.
  • the properties of higher order ribs are desirably chosen such that the shear stress at the rib bottom of the higher order rib is greater than the shear stress at the rib bottom of the lower order rib.
  • the ribs with different geometrical and / or material properties are designed so that they do not fail in the load case time and / or load same, as for example in the known reinforcing bars of the prior art (see, for example WO 95/13414 ) with two helically opposed intersecting ribs which are arranged symmetrically in the axial direction, which means a symmetrical shearing stress and thus, as a rule, a simultaneous failure. If failure can be prevented at the same time and / or under the same load, this increases the ductility of the reinforcing bar.
  • ribs having different rib geometries and / or fin materials In order for the ribs having different rib geometries and / or fin materials to support each other in the inventive manner, they should be disposed at least approximately in the same axial portion of the reinforcing bar - either axially adjacent to one another or spaced apart or overlapping one another or overlaid.
  • the contact surface of the reinforcing bar is reduced in the area of the remaining wider first-order rib with the concrete bar surrounding the reinforcing bar and thus initially reducing the stress on the ribbed bottom of this wider first-order rib.
  • the remaining first-order rib can again absorb additional loads until the shear stresses also exceed the shear strength at the ribbed bottom of the first-order ribs and lead to their shearing off.
  • the ribs of different order can be arranged not only synchronously, for example rotationally symmetric, helical or counter-uniformly distributed over the reinforcing rod, but they can also follow different arrangement patterns, for example, with opposite different slopes to a point-like distribution of the ribs highest order, for example Sanding (in the case of positive ribs) or sandblasting (in the case of negative ribs) can be formed, which has the advantage of a higher bond activation with small slip paths.
  • this should be based on defined properties in the sanded or sandblasted areas to prevent undefined randomness and thus negative effects in the stressed state.
  • a rib geometry can thus be provided for a high-load rib, which can also be used for concrete with the highest strength and does not lead to rib failure of the reinforcement, but rather if necessary, a failure of the concrete console between the ribs. While low strength ribs provide a good bond in normal concrete, the high rigidity ribs provide a minimum composite strength, even for highly cured concrete or concrete with overstrength.
  • ribs of different order can be combined in a multi-step rib, which may have discrete angular jumps or continuous angle changes.
  • different rib properties are combined with each other, whereby in turn the ribs of higher order have a lower shear strength and fail earlier than the ribs of lower order.
  • This can prevent that at a certain time, the whole rib shears off; instead, one of the fractal sub-ribs initially shears because the tension in the rib bottom of this sub-rib exceeds the shear strength.
  • Concrete console is reduced and thus reduces the stress on the ribbed bottom of these remaining sub-ribs.
  • these remaining sub-ribs can take up additional loads until the shear stress on the rib bottom of the then smallest sub-rib is exceeded and leads to their shearing.
  • the base profile of the reinforcing rod may also have a non-circular or oval, quadrangular, star-shaped etc. cross section.
  • the milling process can be circular or oval, centric or eccentric.
  • the reinforcing rod 1 in the FIGS. 1a) and 1b ) is a reinforcing rod 1 can be seen with two superimposed ribs.
  • the reinforcing rod 1 consists of a cylindrical basic shape with a circular cross-section, starting from which first recesses 2 and second recesses 3 extend radially inward, whereby they form overlapping ribs 4, 5.
  • the recesses 2, 3 are arranged in opposite directions, that is, the one recess runs on the right-hand side and the other recess extends left-handed along the reinforcing rod helically around it.
  • the recesses 2 are formed deeper than the wells 3.
  • the wells 2 leave between each ribs 4 (rather, a helical circumferential continuous rib 4); in a corresponding manner leave the wells 3 between them wells 5, which partially overlaps with the ribs 4 due to the mutual overlap of the wells.
  • FIG. 1b is the surface of the reinforcing rod according to the invention from the vertical section recognizable with the rod diameter d 2 in the region of the recess 2 and the rod diameter d 3 in the region of the recess 3.
  • the different ribs or recesses illustrate: Both recesses have the same flank angles ⁇ and the same radii of curvature R 1 in the transition region between recessed bottom 2a, 3a and rib flanks 2b, 3b. Only the rib depths t 2 , t 3 and the recess widths b 2 , b 3 are just as different as the rib pitches T 2 , T 3 (see FIG FIG. 1a )).
  • FIGS. 2a) and 2b show an alternative reinforcing bar 21 with recesses 22, 23 which extend helically along the reinforcing bar 21 in the same direction and have different slopes. This also makes it possible to produce ribs with different geometric properties, which have different shear stresses on the ribbed bottom.
  • FIGS. 3a) and 3b A reinforcing bar 31 is shown in which ribs with different geometric properties merge into each other: while the rib pitch T 4 , ie the distance between adjacent screw flights of the helical circumferential rib is the same across the entire reinforcing bar, the depth t 4 , t 5 changes the recess 22 over the axial length of the rod.
  • quasi ribs 24, 25 with different geometric properties are continuous and stepless into each other and have due to the different rib depth t 4 , t 5 accordingly different load capacities.
  • FIGS. 4 to 7 can illustrate the system of rib designs: So shows FIG. 4 a reinforcing bar 41 having a first order rib 42 and a recess 43 having a rib depth t 42 , a blade pitch angle ⁇ , a pitch T 42 composed of the rib width B 42 plus the distance b 42 between two adjacent ribs.
  • FIG. 5 is now at a reinforcing rod 51 of the first-order rib 42 from FIG. 4 corresponding rib and one of the recess 43 FIG. 4 corresponding recess a narrower rib 52 second order and narrower recesses 53 superimposed, which together with the first-order rib form an order system of narrow ribs of higher order 52, 54, 55, 56 and a wide rib 57 lower order, which carries the narrow ribs. It is easy to see that in a load case, the narrow ribs shear off faster and that their shearing the wide rib 57 still forms a bond with the concrete surrounding the reinforcing rod and thus the rod 51 does not suddenly fail in all anchoring sections simultaneously.
  • FIG. 6 and FIG. 7 Finally, even with rebars 61, 71 are multi-stage ribs 62, 72, which are also the result of the superposition of multiple ribs, the rib portions 62a, 62b, 62c different edge slopes ⁇ 0 , ⁇ 1 and ⁇ 2 and different rib widths B 0 , B 1 , B 2 have.
  • the multi-stage rib 72 is off FIG. 7 the transition between the sections of the rib continuously with continuous width and angle change.
  • the multistage ribs also lead to the fact that, in case of doubt, first the narrowest sub-rib 62c shears off earlier than the widest sub-rib 62a and thus likewise provides for an improvement in the loading capacity of the associated reinforcing rod 61.
  • the present invention offers the advantage of improving the composite behavior of fiber-reinforced plastic reinforcing rods by forming ribs with different geometric and / or material properties, to optimize their application behavior under load and thus to make such plastic reinforcing rods further applications possible. Accordingly, a fiber reinforced plastic reinforcing bar is provided which helps reduce the crack spacing and crack width in the concrete surrounding the reinforcing bar, resulting in the advantages described.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Moulding By Coating Moulds (AREA)
EP08008805A 2007-06-08 2008-05-10 Barre d'armature Withdrawn EP2000609A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007027015A DE102007027015A1 (de) 2007-06-08 2007-06-08 Bewehrungsstab

Publications (1)

Publication Number Publication Date
EP2000609A1 true EP2000609A1 (fr) 2008-12-10

Family

ID=39766860

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08008805A Withdrawn EP2000609A1 (fr) 2007-06-08 2008-05-10 Barre d'armature

Country Status (4)

Country Link
US (1) US20080302063A1 (fr)
EP (1) EP2000609A1 (fr)
CA (1) CA2633986C (fr)
DE (1) DE102007027015A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100031607A1 (en) * 2008-08-11 2010-02-11 Oliva Michael G Splice System for Fiber-Reinforced Polymer Rebars
RU2405092C2 (ru) * 2008-12-26 2010-11-27 Общество с ограниченной ответственностью "Коммерческое научно-производственное объединение "Уральская армирующая компания" Композитная арматура
US8413396B2 (en) * 2009-08-11 2013-04-09 Wisconsin Alumni Research Foundation Splice system for connecting rebars in concrete assemblies
US8511038B2 (en) * 2011-02-15 2013-08-20 Randel Brandstrom Concrete panel with fiber reinforced rebar
DE102011109122A1 (de) * 2011-08-01 2013-02-07 B.T. Innovation Gmbh Mehrschichtiges Bauelement
DE102012019125B4 (de) * 2011-10-06 2016-07-07 Peter Markwirth Strahlenschutzcontainer für leicht- und mittelschwere radioaktiv belastetes Material.
EP2857607A1 (fr) 2013-10-01 2015-04-08 Latvijas Universitates agentura "Latvijas Universitates Polimeru mehanikas Instituts" Barre de renforcement FRP
EP3091135A1 (fr) 2015-05-04 2016-11-09 Evonik Degussa GmbH Barre d'armature, procédé de fabrication et utilisation
US11041309B2 (en) * 2018-10-29 2021-06-22 Steven T Imrich Non-corrosive micro rebar
EP3884123A1 (fr) 2018-11-19 2021-09-29 Owens-Corning Intellectual Capital, LLC Barre d'armature composite
CA3174452A1 (fr) * 2020-03-17 2021-09-23 Owens Corning Intellectual Capital, Llc Barre d'armature composite a traitement de surface post-meulage
DE202021000006U1 (de) 2021-01-03 2022-04-05 Herchenbach Industrial Buildings GmbH Erdnagel für ein lndustriezelt
DE102021003798A1 (de) 2020-07-24 2022-01-27 Herchenbach lndustrial Buildings GmbH Erdnagel für ein lndustriezelt

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE857269C (de) * 1941-02-26 1952-11-27 Emil Dipl-Ing Rossmann Profil fuer einen gedrillten Betonbewehrungsstahl
GB1102148A (en) * 1964-06-20 1968-02-07 Hoesch Ag Improvements in or relating to a reinforcing bar for concrete
DE1409168A1 (de) * 1959-06-10 1969-01-30 Tor Isteg Steel Corp Betonbewehrungsstab
DE2622524A1 (de) * 1976-05-20 1977-11-24 Janovic Kassian Anton Dipl Ing Gerippter betonstahl und spannstahl
EP0199348A2 (fr) 1985-04-26 1986-10-29 Societe Nationale De L'amiante Barre de construction pour le renforcement de matériau en béton
EP0306887A1 (fr) * 1987-09-11 1989-03-15 Dyckerhoff & Widmann Aktiengesellschaft Barre d'armature pour béton laminée à chaud, en particulier barre nervurée pour béton
EP0560362A2 (fr) * 1992-03-13 1993-09-15 KOMATSU PLASTICS INDUSTRY CO., Ltd. Armature en matière plastique renforcée de fibre pour béton
WO1998031891A1 (fr) 1997-01-16 1998-07-23 Camplas Technology Limited Ameliorations apportees aux barres d'armatures

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Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE857269C (de) * 1941-02-26 1952-11-27 Emil Dipl-Ing Rossmann Profil fuer einen gedrillten Betonbewehrungsstahl
DE1409168A1 (de) * 1959-06-10 1969-01-30 Tor Isteg Steel Corp Betonbewehrungsstab
GB1102148A (en) * 1964-06-20 1968-02-07 Hoesch Ag Improvements in or relating to a reinforcing bar for concrete
DE2622524A1 (de) * 1976-05-20 1977-11-24 Janovic Kassian Anton Dipl Ing Gerippter betonstahl und spannstahl
EP0199348A2 (fr) 1985-04-26 1986-10-29 Societe Nationale De L'amiante Barre de construction pour le renforcement de matériau en béton
EP0306887A1 (fr) * 1987-09-11 1989-03-15 Dyckerhoff & Widmann Aktiengesellschaft Barre d'armature pour béton laminée à chaud, en particulier barre nervurée pour béton
EP0560362A2 (fr) * 1992-03-13 1993-09-15 KOMATSU PLASTICS INDUSTRY CO., Ltd. Armature en matière plastique renforcée de fibre pour béton
WO1998031891A1 (fr) 1997-01-16 1998-07-23 Camplas Technology Limited Ameliorations apportees aux barres d'armatures

Also Published As

Publication number Publication date
CA2633986A1 (fr) 2008-12-08
US20080302063A1 (en) 2008-12-11
CA2633986C (fr) 2012-08-21
DE102007027015A1 (de) 2008-12-11

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