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EP2239391A1 - Bewehrungselement für eine Betonkonstruktion - Google Patents

Bewehrungselement für eine Betonkonstruktion Download PDF

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Publication number
EP2239391A1
EP2239391A1 EP09157384A EP09157384A EP2239391A1 EP 2239391 A1 EP2239391 A1 EP 2239391A1 EP 09157384 A EP09157384 A EP 09157384A EP 09157384 A EP09157384 A EP 09157384A EP 2239391 A1 EP2239391 A1 EP 2239391A1
Authority
EP
European Patent Office
Prior art keywords
reinforcing element
protection block
rod
concrete
shaped member
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Withdrawn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
EP09157384A
Other languages
English (en)
French (fr)
Inventor
Aurelio Muttoni
Miguel Fernández Ruiz
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.)
Ecole Polytechnique Federale de Lausanne EPFL
Original Assignee
Ecole Polytechnique Federale de Lausanne EPFL
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 Ecole Polytechnique Federale de Lausanne EPFL filed Critical Ecole Polytechnique Federale de Lausanne EPFL
Priority to EP09157384A priority Critical patent/EP2239391A1/de
Priority to PL10714089T priority patent/PL2417310T3/pl
Priority to US13/262,937 priority patent/US20120066988A1/en
Priority to PCT/IB2010/051483 priority patent/WO2010116323A1/en
Priority to EP10714089A priority patent/EP2417310B1/de
Publication of EP2239391A1 publication Critical patent/EP2239391A1/de
Withdrawn legal-status Critical Current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
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/0645—Shear reinforcements, e.g. shearheads for floor slabs

Definitions

  • the present invention relates to a reinforcing element for concrete construction comprising a rod-shaped member having a cross-sectional enlargement on at least one end thereof.
  • Reinforcement in structural concrete is placed to carry tensile forces due to the limited and unreliable tensile strength of concrete. In order to ensure an adequate performance and durability of the reinforcement, two aspects should be taken into account.
  • the bars require sufficient concrete cover to avoid rusting and corrosion problems. Typical values for this cover lay between 35 to 50 mm. Moreover, a minimum embedment length (or development length) has to be provided so that the reinforcement can develop its yield strength. Typical values for this length in ordinary concrete lay between 35 to 40 times the diameter of the bar.
  • a reinforcing element for concrete construction in the form of a set bolt is formed of a rod-shaped section with a cross-sectional enlargement provided on the end.
  • the cross-sectional enlargement is formed of glass-fibre reinforced plastic and has an axial bore in its centre.
  • the cross-sectional enlargement is provided as a separate part engaged in a form-locking manner with the rod-shaped section of the set bolt.
  • the two components are connected by gluing, screwing, fusing, etc.
  • the bar and bolts always lay inside the concrete.
  • the disclosed embodiments do not allow introducing intermediate pieces as suspension points and the significant size of the bolts does not allow using them in all types of configuration, such as for instance thin slabs.
  • shearing force reinforced structure and member discloses the use of a link member to reinforce an existing concrete member.
  • the document discloses a shearing force reinforced structure for an existing reinforced concrete structure body.
  • the structure is configured with a side wall of an existing reinforced concrete structure, shearing force reinforced members arranged inside reinforced member insertion holes with bottoms formed in a direction intersecting a major reinforcing bar of the side wall. Fillers are provided in the holes.
  • Each of the shearing force reinforced members is configured with a shearing force reinforcing bar, a plate head and a ring head respectively fixed at a base end and top end of the reinforcing bar. This technique is exclusively to be post-installed by boring holes in an existing member.
  • a reinforcing element for concrete construction comprising:
  • This reinforcing element provides a single solution in order to solve at the same time the problems of minimum concrete cover, spalling of the concrete cover and development length.
  • Such reinforcing element allows developing the tensile forces of the reinforcing bar within a series of high-performance protection blocks that also protect the bar from corroding or rusting.
  • the protection block material is concrete and preferably high or ultra high performance concrete.
  • the protection block material is selected from the list comprising ceramic, resin. Any of the above mentioned materials may be reinforced with fibers.
  • the protection block is preferably disk-shaped, but several variants, such as parallelepiped shapes may also be provided.
  • the protection block material is substantially impermeable (watertight).
  • at least the outer portion of said protection block is provided with a substantially low permeability of low porosity material.
  • the protection block material provides high adhesion to said rod-shaped member. Optimization of embedment length may be obtained if the protection block surface interfacing with said rod-shaped member provides a substantially high adhesion to the rod-shaped member.
  • the reinforcing element comprises two protection blocks, one at each end thereof.
  • the rod-shaped member is U-shaped with a connecting leg provided between the two axial portions and further comprises a protection block in which said connecting leg is at least partially embedded.
  • the reinforcing element is further provided with a protection channel provided on one axial portion of the rod-shaped member, at the immediate proximity of said protection block. Such a channel may be helpful to provide extended impermeability along the main portion.
  • the elbow portion comprises an angled portion and a radial member extending substantially radially from adjacent axial portion.
  • the angle between the radial member and adjacent axial portion is substantially 90 degrees.
  • Other values can be considered to enhance bond performance, in particular angles lower than 90 degrees.
  • the invention also provides a method for producing a reinforcing element for concrete construction in the form of a rod-shaped member provided with a protection block at one end thereof, comprising the steps of producing said rod-shaped member, bending end portion of said rod member, covering said bent portion with a protection block.
  • the protection block may be provided by molding or by spraying.
  • Figures 1a to 1d illustrates known type reinforcements embedded in concrete constructions.
  • the reinforcement 1 is configured such as to provide a concrete cover having a minimum thickness CC1.
  • the bars require sufficient concrete cover to avoid rusting and corrosion problems. Typical values for this cover lay between 35 to 50 mm.
  • the concrete cover is arranged such as to provide a minimum thickness CC1 between known type T-headed bar reinforcement and the concrete surface, for the same reasons as above.
  • Figure 1b shows the development length DL1 required in a known type installation.
  • the bar shall be embedded in the concrete.
  • DL1 may require significant embedment length. Depending on the specific construction configuration, such a length may sometimes not be provided.
  • Figure 1c illustrates the problem of cover spalling, after spalling cracks 22 have appeared in the reinforced concrete of prior art installations.
  • Figures 2a to 2d illustrate various embodiments of a reinforcing element 10 according to the invention.
  • the reinforcing element 10 is provided with an extended rod-shape member 11.
  • This rod-shaped member is preferably made with steel alloys.
  • the axial portion 16 of the rod-shaped member 11 is substantially elongated, and generally substantially linear.
  • At least one end of the rod-shaped member is provided with an elbow portion 12, having an angled portion 13 joining the axial portion 16 to a radial portion 14.
  • the angle ⁇ between radial member 14 and adjacent axial portion 16 is substantially 90 degrees. Angles near 90 degrees provide high anchoring force between the rod-shaped member and the block. Other angle values may be provided depending on the mechanical requirements of the construction work.
  • the length of the axial and radial portions 16 and 14 depends on the application in which the reinforcing member shall be used. More particularly, the length of the radial portion 14 is defined as a function of the global resistance to be provided in the planned construction. For more convenience and in order to reduce manufacturing costs of the reinforcing elements 10, the most usual standard dimensions may be provided on a large scale manufacturing basis.
  • the elbow portion 12 is embedded in a protection block 15.
  • This protection block provides a very efficient protection against corrosion and rusting of the rod-shaped member 11. It also contributes to reduce the required embedment length.
  • the block 15 is preferably made with a material having low porosity or permeability. The material is to be such that protection to corrosion, considering the bar cover within the block (typically equal to the diameter of the bar), is the same as the protection with ordinary cover in traditional reinforced concrete members.
  • the block 15 may be made with concrete, preferably high or ultra-high performance concrete or similar cementitious materials, preferably reinforced with fibers, such as Ductal, a well known UHPFRC (Ultra High Performance Fiber Reinforced Concrete).
  • the block 15 may also be made with other materials, such as ceramic, resin or synthetic material.
  • the selected material should also preferably provide high adherence between the material and the rod-shaped member 11.
  • Typical average values of bond strength measured in standard pull-out tests lay between 40 to 60 MPa.
  • a block 15 comprises two materials, one for the outer surfaces, having very low permeability, and one for the inner volume of the block, offering less permeability protection, but allowing producing at lower global costs.
  • the material providing the interfacing surface with the rod-shaped member 11 is specifically selected to provide high adherence with the latter.
  • the protection block 15 shape or profile may vary depending on the type of use, the mechanical properties, manufacturing costs, etc.
  • the blocks 15 have disk profiles. Other profiles such as parallelepiped may also be used.
  • the block dimensions are determined in order to optimize the global mechanical properties of the construction work using the reinforcing elements. For best results, a minimum thickness of material covering the elbow portion 12 is provided.
  • the elbow portions 12 are fully embedded in the blocks 15.
  • a protection block may entirely or partly embed the radial portion 14 only, while the angled portion 13 is not embedded. This would allow protecting the reduced embedded area against rusting and corrosion.
  • Figure 2b shows a variant of the embodiment of Figure 2a in which two protection blocks 15 are provided, one at each end, in an arrangement similar to the previously described arrangement of Figure 2a , involving elbow portions 12 imbedded in protection blocks 15 at both ends of the reinforcing element 10.
  • Figure 2c and Figure 2d illustrate embodiments with U-shaped reinforcing elements 10 in which two axial portions 16 are provided on each side of a connecting leg 17.
  • the connecting leg 17 is not covered or embedded. Both free ends of the axial portions 16 are provided with embedded elbow arrangement similar to the previously described arrangement in relation with Figure 2a .
  • the embodiment of Figure 2d differs from the latter in that the connecting leg 17 is at least partially embedded in a protection block 15. In the example shown in Figure 2d , the connecting leg 17 is entirely embedded.
  • the rod-shaped members 11 to be used can either be ordinary or high-strength reinforcing bars or pre-stressing bars or tendons to be fully or partly embedded in structural concrete members where at least one end is embedded in a protection block 15.
  • Figure 3 presents a comparison between the standard concrete cover required minimal thickness CC1 and minimal concrete cover CC2 resulting from the invention.
  • the protection block of the reinforcement element may be placed into the CC1 zone of prior art installations, thus reducing considerably the concrete cover minimal thickness.
  • Figure 4 depicts a comparison between the standard embedment length required DL1 and embedment length DL2 resulting from the invention.
  • the use of an elbow portion 15 embedded in a protection block allows to significantly reduce the embedment length from DL1 (prior art configuration) to DL2.
  • Typical values of DL2 lay between 10% and 15% of DL1
  • the reinforcing element 10 can be used as a high performance shear and punching shear reinforcing system.
  • the figures show that the compression face of the slab is suitably confined and that all reinforcements are suitably developed.
  • U-shaped reinforcing elements are used.
  • An example of punching shear crack 21 is provided in the Figure.
  • U-shaped reinforcing elements in which the connecting legs 17 are provided with protection blocks are used.
  • inclined reinforcements can also be used.
  • Figure 7 shows a further application in which the confinement reinforcement for members cast with brittle (high strength or lightweight) concrete.
  • the struts developing close to the compression face are suitably confined and premature spalling of the piece is avoided. Examples of cover spalling crack 22 are provided in the Figure.
  • the protection blocks 15 are not embedded in the concrete. Protection channels 20 are provided adjacent to protection blocks and provide further corrosion protection.
  • the protection channels 20 are preferably made with the same material as the blocks. In such a case, they may be molded together with the blocks during manufacturing. Partial embedment of the blocks is also possible.
  • Figure 8 illustrates an application in which a reinforcing element 10 is used to provide anchorage points for structural concrete members.
  • the reinforcing element configuration is designed to leave a portion of the element outside the structural concrete member, allowing using the free portion as tension anchorage reinforcement.
  • a protection block 15 is provided to protect the rod-shaped member 11 in order not to leave it in direct contact with the outer atmosphere.
  • Figure 9 shows that the reinforcing element 10 may further be used as a link member to connect two parts of a structural concrete member cast at different ages or two different concrete members 40 and 41.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Lining And Supports For Tunnels (AREA)
EP09157384A 2009-04-06 2009-04-06 Bewehrungselement für eine Betonkonstruktion Withdrawn EP2239391A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09157384A EP2239391A1 (de) 2009-04-06 2009-04-06 Bewehrungselement für eine Betonkonstruktion
PL10714089T PL2417310T3 (pl) 2009-04-06 2010-04-06 Element zbrojeniowy do strukturalnej konstrukcji betonowej
US13/262,937 US20120066988A1 (en) 2009-04-06 2010-04-06 Reinforcement element for structural concrete construction
PCT/IB2010/051483 WO2010116323A1 (en) 2009-04-06 2010-04-06 Reinforcement element for structural concrete construction
EP10714089A EP2417310B1 (de) 2009-04-06 2010-04-06 Bewehrungselement für einen konstruktionsbetonbau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09157384A EP2239391A1 (de) 2009-04-06 2009-04-06 Bewehrungselement für eine Betonkonstruktion

Publications (1)

Publication Number Publication Date
EP2239391A1 true EP2239391A1 (de) 2010-10-13

Family

ID=41008204

Family Applications (2)

Application Number Title Priority Date Filing Date
EP09157384A Withdrawn EP2239391A1 (de) 2009-04-06 2009-04-06 Bewehrungselement für eine Betonkonstruktion
EP10714089A Not-in-force EP2417310B1 (de) 2009-04-06 2010-04-06 Bewehrungselement für einen konstruktionsbetonbau

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10714089A Not-in-force EP2417310B1 (de) 2009-04-06 2010-04-06 Bewehrungselement für einen konstruktionsbetonbau

Country Status (4)

Country Link
US (1) US20120066988A1 (de)
EP (2) EP2239391A1 (de)
PL (1) PL2417310T3 (de)
WO (1) WO2010116323A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2851479A3 (de) * 2013-02-12 2015-06-03 Ancotech Ag Verstärkungssystem gegenüber der Strebenlage mit Stangen auf Querstangen, die mit Ankerköpfen ausgestattet sind
EP2653627A3 (de) * 2012-04-21 2016-10-05 Thomas Friedrich Schubbewehrungselement für eine Tragplatte und Tragplatte mit eingebautem Schubbewehrungselement
AT521549A1 (de) * 2018-07-23 2020-02-15 Univ Wien Tech Verfahren zur Herstellung einer Verankerung für ein Zugglied in einer Betonplatte

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2236686A1 (de) * 2009-04-03 2010-10-06 F.J. Aschwanden AG Bewehrungselement für die Aufnahme von Kräften von betonierten Platten im Bereich von Stützelementen
WO2016049758A1 (en) 2014-09-30 2016-04-07 UNIVERSITé LAVAL Built-up system, connector thereof, and method of making same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987004208A1 (en) * 1986-01-14 1987-07-16 Nill, Werner Process for producing concrete consisting of cement, aggregate and water, a tension-resisting concrete and a concrete reinforcing element
US5038545A (en) * 1988-05-09 1991-08-13 Heribert Hiendl Reinforcing steel rod with improved reverse bendability
DE4409707A1 (de) * 1994-03-22 1995-09-28 Zellner Wilhelm Stütze aus Stahlbeton
WO2001051731A1 (en) * 2000-01-13 2001-07-19 The Dow Chemical Company Small cross-section composites of longitudinally oriented fibers and a thermoplastic resin as concrete reinforcement
WO2002048476A1 (en) * 2000-12-13 2002-06-20 N.V. Bekaert S.A. Reinforcement fiber bundle and production method of such reinforcement fiber bundle
US20060090416A1 (en) 2004-10-29 2006-05-04 Schock Bauteile Gmbh Reinforcing element for concrete construction
US20070175127A1 (en) 2004-08-18 2007-08-02 Taisei Corporation Shearing force reinforced structure and member
EP1905923A2 (de) 2006-09-28 2008-04-02 HILTI Aktiengesellschaft Ankerstab und Anordnung zum Verstärken von bestehenden Bauteilen gegen Durchstanzen mit einem solchen Ankerstab

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6041561A (en) * 1997-08-22 2000-03-28 Wayne Leblang Self-contained molded pre-fabricated building panel and method of making the same
CA2314417C (en) * 1999-11-04 2003-05-20 Gordon Graham Concrete block for elevating and retaining surfaces
EP1767729A1 (de) * 2005-09-23 2007-03-28 Sika Technology AG Turmkonstruktion
US20100107536A1 (en) * 2006-07-14 2010-05-06 Ryan Douglas Tautari Thermo tech mark ii limited
US20100154332A1 (en) * 2008-12-23 2010-06-24 Chevron U.S.A. Inc. Base mat assembly and method of constructing the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987004208A1 (en) * 1986-01-14 1987-07-16 Nill, Werner Process for producing concrete consisting of cement, aggregate and water, a tension-resisting concrete and a concrete reinforcing element
US5038545A (en) * 1988-05-09 1991-08-13 Heribert Hiendl Reinforcing steel rod with improved reverse bendability
DE4409707A1 (de) * 1994-03-22 1995-09-28 Zellner Wilhelm Stütze aus Stahlbeton
WO2001051731A1 (en) * 2000-01-13 2001-07-19 The Dow Chemical Company Small cross-section composites of longitudinally oriented fibers and a thermoplastic resin as concrete reinforcement
WO2002048476A1 (en) * 2000-12-13 2002-06-20 N.V. Bekaert S.A. Reinforcement fiber bundle and production method of such reinforcement fiber bundle
US20070175127A1 (en) 2004-08-18 2007-08-02 Taisei Corporation Shearing force reinforced structure and member
US20060090416A1 (en) 2004-10-29 2006-05-04 Schock Bauteile Gmbh Reinforcing element for concrete construction
EP1905923A2 (de) 2006-09-28 2008-04-02 HILTI Aktiengesellschaft Ankerstab und Anordnung zum Verstärken von bestehenden Bauteilen gegen Durchstanzen mit einem solchen Ankerstab

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2653627A3 (de) * 2012-04-21 2016-10-05 Thomas Friedrich Schubbewehrungselement für eine Tragplatte und Tragplatte mit eingebautem Schubbewehrungselement
EP2851479A3 (de) * 2013-02-12 2015-06-03 Ancotech Ag Verstärkungssystem gegenüber der Strebenlage mit Stangen auf Querstangen, die mit Ankerköpfen ausgestattet sind
AT521549A1 (de) * 2018-07-23 2020-02-15 Univ Wien Tech Verfahren zur Herstellung einer Verankerung für ein Zugglied in einer Betonplatte
AT521549B1 (de) * 2018-07-23 2020-07-15 Univ Wien Tech Verfahren zur Herstellung einer Verankerung für ein Zugglied in einer Betonplatte

Also Published As

Publication number Publication date
US20120066988A1 (en) 2012-03-22
EP2417310B1 (de) 2013-01-16
EP2417310A1 (de) 2012-02-15
PL2417310T3 (pl) 2013-06-28
WO2010116323A1 (en) 2010-10-14

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