EP4124703A1 - Structure en béton armé renforcé - Google Patents

Structure en béton armé renforcé Download PDF

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Publication number
EP4124703A1
EP4124703A1 EP21187925.9A EP21187925A EP4124703A1 EP 4124703 A1 EP4124703 A1 EP 4124703A1 EP 21187925 A EP21187925 A EP 21187925A EP 4124703 A1 EP4124703 A1 EP 4124703A1
Authority
EP
European Patent Office
Prior art keywords
grooves
fiber composite
composite material
reinforced concrete
adhesive
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.)
Pending
Application number
EP21187925.9A
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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.)
Sika Technology AG
Original Assignee
Sika Technology AG
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 Sika Technology AG filed Critical Sika Technology AG
Priority to EP21187925.9A priority Critical patent/EP4124703A1/fr
Publication of EP4124703A1 publication Critical patent/EP4124703A1/fr
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off

Definitions

  • the invention relates to a reinforced concrete construction, in particular a reinforced concrete slab or reinforced concrete bending beam, and a method for reinforcing reinforced concrete constructions.
  • fiber composite materials have been used for the static reinforcement of reinforced concrete components as flexural or flexural reinforcement.
  • Such fiber composite materials made of carbon, basalt, aramid or glass fibers are produced as prefabricated laminates and glued to the entire surface of the reinforced concrete with a pasty epoxy resin.
  • unidirectional scrims or bidirectional fabrics made from the aforementioned fibers are laminated directly to the building object.
  • CFRP slats made of carbon fibers
  • CFRP slats the laminate is mechanically fixed on both sides at the end so that the slat can be prestressed.
  • the force is introduced into the concrete on the one hand via the adhesive surface and on the other hand via a mechanical end anchor, which typically consists of metal elements. Even with slack CFRP reinforcements, the force can be introduced via the adhesive bond and, if necessary, via an additional mechanical end anchor.
  • WO 2020/157009 A1 shows a well-known deep anchorage for prestressed CFRP slats. Slots are milled across the entire surface of the slats and filled with adhesive. By slitting in depth, the area for the introduction of force is significantly increased due to the vertical of the slits. This almost doubles the force application area. Thanks to this doubling, it is possible to introduce more tensile force from the laminate into the concrete base.
  • This deep anchoring is used when special thick CFRP slats are prestressed. Thick CFRP slats have a significantly higher tensile strength. Accordingly, full-surface adhesion is not sufficient to transfer these high forces to the supporting base.
  • an additional U-profile is used at the end of the slats in the area of the end anchorage.
  • This U-profile also improves the introduction of force.
  • the tensile force of 3 mm thick CFRP laminations can be introduced into the supporting base.
  • the costs, in particular for a workload, are according to reinforcement WO 2020/157009 A1 however very high.
  • the object of the invention is therefore to provide an improved system for a reinforced concrete structure and an improved method for reinforcing reinforced concrete structures.
  • the costs and/or time required are to be reduced.
  • a reinforced concrete construction in particular a reinforced concrete slab or reinforced concrete bending beam, comprising: a reinforced concrete construction; an adhesive; and an elongated fiber composite material which is loosely applied by means of the adhesive on a tension side of the reinforced concrete structure.
  • the elongate fiber composite material has two end areas and a central area, with the reinforced concrete structure having at least one groove under the end areas of the fiber composite material, and the grooves being filled with the adhesive, so that the fiber composite material can be fixed in its end areas via the adhesive in the grooves in the Reinforced concrete structure is anchored.
  • the solution proposed here initially has the advantage that inexpensive local deep anchoring is possible with local milled slots (grooves) under a fiber composite material. Such short, local milling cuts only in the end areas of the fiber composite material can be produced inexpensively, for example by means of hand milling.
  • the solution proposed here has the advantage that the anchoring of the fiber composite material in the grooves can reliably prevent premature delamination at the ends of the fiber composite material.
  • Such delaminations mean that only insufficient tensile force is transferred from the fiber composite material to the supporting base and must therefore be avoided as far as possible.
  • a core idea of the present invention is that deep anchoring takes place only locally at both ends of the loosely applied lamella (fiber composite material). It has been shown that the effect of such anchoring is greatest in these areas, and that by omitting such anchoring in a central area of the slats, a comparatively large amount of effort and costs can be saved without losing the essential effect of the anchoring .
  • loosely or loosely applied means “not pretensioned” or “not pretensioned”.
  • the reinforcement elements applied to the reinforced concrete structure do not include any metallic components.
  • the same adhesive is used for bonding the fiber composite material to the reinforced concrete structure and for filling the grooves.
  • an epoxy resin adhesive is used as the adhesive.
  • two different adhesives are used as the adhesive, with the grooves being filled with a first adhesive and the fiber composite material being applied to the reinforced concrete structure with a second adhesive.
  • the first adhesive has a lower modulus of elasticity (tensile modulus) than the second adhesive.
  • the reinforced concrete structure comprises a plurality of grooves, in particular running parallel to one another, under each end area of the fiber composite material.
  • the grooves run substantially parallel to the elongated fiber composite.
  • the grooves run essentially orthogonally to the elongate fiber composite material.
  • the grooves run in a freely selectable direction and/or the grooves do not run parallel to one another.
  • the grooves at least partially intersect.
  • the grooves have a length of 200 to 2000 mm, preferably 200 to 1500 mm, particularly preferably 200 to 1000 mm.
  • the grooves have a depth of 5 to 30 mm, preferably 10 to 25 mm, particularly preferably 12 to 22 mm.
  • the grooves have a width of 5 to 30 mm, preferably 10 to 20 mm.
  • the grooves have a rectangular cross-section.
  • the grooves have a triangular, or a semicircular, or an irregularly shaped, or a trapezoidal cross-section.
  • the grooves have a cross section which has an undercut.
  • At least two or at least three or at least four or at least five grooves are arranged under the end regions of the fiber composite material.
  • a maximum of ten or a maximum of eight or a maximum of six grooves are arranged under the end regions of the fiber composite material.
  • an anchoring force can be increased by a larger number of grooves under the end regions of the fiber composite material.
  • the anchoring force can be roughly tripled compared to gluing the fiber composite material without grooves.
  • a suitable number, shape and dimensioning of the grooves can be selected.
  • the fiber composite material consists of a prefabricated laminate.
  • the fiber composite material consists of a unidirectional or bidirectional fabric that is manufactured on site.
  • the fiber composite material consists of carbon fibers, in particular high-strength carbon fibers, or of basalt fibers, or of aramid fibers, or of glass fibers, or of a combination of these materials.
  • a fibrous material is arranged across the end areas of the fiber composite material, which is anchored in the reinforced concrete structure to the side of the end areas of the fiber composite material.
  • this fibrous material is a unidirectional fiber fabric or fibrous fabric, and/or this fibrous material consists of high-strength carbon fibers.
  • the object set at the beginning is also achieved by a method for reinforcing reinforced concrete structures, in particular reinforced concrete slabs or reinforced concrete bending beams, the method comprising the steps: milling at least two grooves in a tension side of the reinforced concrete structure, with an intermediate area between the two grooves remaining without milling; applying an adhesive in an elongate pattern, the adhesive covering both the areas of the grooves and the intermediate area, and the grooves being filled with adhesive; applying a flaccid elongate fiber composite to the adhesive such that an end portion of the fiber composite overlies the grooves and a central portion of the fiber composite overlies the intermediate portion between the grooves; so that the fiber composite material is anchored in its end areas via the adhesive in the grooves in the reinforced concrete structure.
  • the method proposed here offers the same advantages that have already been mentioned for the system proposed here.
  • the method can be designed to be more cost-effective, less time-consuming and require fewer tools.
  • a hand mill is used in the milling.
  • the milling operation involves the use of multiple milling blades in a milling machine to form the grooves and gouging away any concrete left between the milling grooves formed thereby.
  • the application of the adhesive forms a continuous adhesive layer which has essentially the same base area as the fiber composite adhesive to be applied thereto.
  • only one adhesive is used when applying the adhesive.
  • two different adhesives are used during application, with the grooves being filled with a first adhesive, and with a second adhesive being applied at least to the intermediate area, in particular after the grooves have been filled with the first adhesive.
  • the first adhesive has a lower modulus of elasticity (tensile modulus) than the second adhesive.
  • an exemplary reinforced concrete structure 1 is shown, which is reinforced with a fiber composite material 4 .
  • the fiber composite material 4 is applied to a tension side 2 of the reinforced concrete structure 1 .
  • the fiber composite material 4 has two end areas 5 and an intermediate central area 6. Under the end areas 5 of the fiber composite material 4 there are grooves in the reinforced concrete structure 1, which is not visible in this figure.
  • FIGS 2a and 2b two exemplary embodiments of grooves 7 are shown schematically.
  • the grooves 7 each have a length 9.
  • the grooves 7 are aligned in a direction which runs essentially parallel to the intended longitudinal direction of the fiber composite material.
  • the grooves 7 are aligned in a direction which is essentially orthogonal to the intended longitudinal direction of the fiber composite material.
  • the intended application locations of the fiber composite material are shown in these figures, with the end regions 5 and the central region 6 of the fiber composite material being identified.
  • FIG 3a three grooves 7 are shown with a rectangular cross section.
  • the grooves 7 have a width 11 and a depth 10.
  • Figure 3b four grooves 7 are shown with a triangular cross-section.
  • the grooves 7 run essentially transversely to a longitudinal direction of the fiber composite material 4.
  • 3c five grooves 7 are shown, the cross section of which is trapezoidal and has an undercut.
  • a fibrous material 8 is arranged over the end areas of the fiber composite material 4 and is anchored in the reinforced concrete structure 2 to the side of the end area of the fiber composite material 4 .
  • the fiber material 8 is anchored by gluing it to the side walls of the reinforced concrete structure 1.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
EP21187925.9A 2021-07-27 2021-07-27 Structure en béton armé renforcé Pending EP4124703A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21187925.9A EP4124703A1 (fr) 2021-07-27 2021-07-27 Structure en béton armé renforcé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21187925.9A EP4124703A1 (fr) 2021-07-27 2021-07-27 Structure en béton armé renforcé

Publications (1)

Publication Number Publication Date
EP4124703A1 true EP4124703A1 (fr) 2023-02-01

Family

ID=77398375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21187925.9A Pending EP4124703A1 (fr) 2021-07-27 2021-07-27 Structure en béton armé renforcé

Country Status (1)

Country Link
EP (1) EP4124703A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5937606A (en) * 1995-01-09 1999-08-17 Eidgenossische Materialprufungs-Und Forschungsanstalt Empa Securing of reinforcing strips
EP1016767A1 (fr) * 1997-09-16 2000-07-05 Nippon Steel Corporation Structure de renfort d'elements de beton et procede associe
JP3220540B2 (ja) * 1992-12-25 2001-10-22 新日本製鐵株式会社 一方向配列強化繊維シートによるコンクリート補修方法
KR20030037117A (ko) * 2001-11-02 2003-05-12 한국건설기술연구원 전단키와 섬유보강쉬트를 이용한 구조물 보강공법
US20120110940A1 (en) * 2010-11-04 2012-05-10 Garland Industries, Inc. Method and apparatus for repairing concrete
WO2020157009A1 (fr) 2019-02-01 2020-08-06 S&P Clever Reinforcement Company Ag Procédé de renforcement de structures en béton ou en bois à l'aide de bandes cfrp et structures en béton ou en bois renforcées par ce procédé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3220540B2 (ja) * 1992-12-25 2001-10-22 新日本製鐵株式会社 一方向配列強化繊維シートによるコンクリート補修方法
US5937606A (en) * 1995-01-09 1999-08-17 Eidgenossische Materialprufungs-Und Forschungsanstalt Empa Securing of reinforcing strips
EP1016767A1 (fr) * 1997-09-16 2000-07-05 Nippon Steel Corporation Structure de renfort d'elements de beton et procede associe
KR20030037117A (ko) * 2001-11-02 2003-05-12 한국건설기술연구원 전단키와 섬유보강쉬트를 이용한 구조물 보강공법
US20120110940A1 (en) * 2010-11-04 2012-05-10 Garland Industries, Inc. Method and apparatus for repairing concrete
WO2020157009A1 (fr) 2019-02-01 2020-08-06 S&P Clever Reinforcement Company Ag Procédé de renforcement de structures en béton ou en bois à l'aide de bandes cfrp et structures en béton ou en bois renforcées par ce procédé

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