EP0799951B1 - Verfahren zur Verstärkung von Konstruktionen durch angeklebte Kohlstofffasern - Google Patents

Verfahren zur Verstärkung von Konstruktionen durch angeklebte Kohlstofffasern Download PDF

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Publication number
EP0799951B1
EP0799951B1 EP97400756A EP97400756A EP0799951B1 EP 0799951 B1 EP0799951 B1 EP 0799951B1 EP 97400756 A EP97400756 A EP 97400756A EP 97400756 A EP97400756 A EP 97400756A EP 0799951 B1 EP0799951 B1 EP 0799951B1
Authority
EP
European Patent Office
Prior art keywords
fabric
resin
carbon fibre
strip
mpa
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
EP97400756A
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English (en)
French (fr)
Other versions
EP0799951A1 (de
Inventor
Alain Raymond Chabert
Roger Lacroix
Jean Georges Luyckx
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.)
Freyssinet International STUP SA
Original Assignee
Laboratoire Central des Ponts et Chaussees
Bostik Findley SA
Freyssinet International STUP SA
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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Publication date
Application filed by Laboratoire Central des Ponts et Chaussees, Bostik Findley SA, Freyssinet International STUP SA filed Critical Laboratoire Central des Ponts et Chaussees
Publication of EP0799951A1 publication Critical patent/EP0799951A1/de
Application granted granted Critical
Publication of EP0799951B1 publication Critical patent/EP0799951B1/de
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Expired - Lifetime 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
    • 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

Definitions

  • the present invention relates to methods of reinforcement of civil engineering structures with fibers bonded carbon, processes that are used to increase the resistance of civil engineering structures in particular when their mechanical characteristics have deteriorated due to aging.
  • document US-A-5 308 430 describes a process of strengthening civil engineering structures in using carbon or other fibers which are coated with resin when applied to the structure.
  • the aforementioned document provides for using fibers that are initially stranded and then to flatten these strands by crushing in order to constitute flat strips of fibers: this manufacturing process presents the disadvantage of risking damaging the fibers during crushing the strands.
  • the object of the present invention is in particular to overcome these various drawbacks.
  • the reinforcement thus obtained is particularly efficient and reliable, in particular because the efforts to resume are transmitted from the civil engineering structure to carbon fibers through a matrix of unique and homogeneous resin, avoiding any layer of intermediate material between this matrix and the structure strengthen.
  • the method according to the invention contributes also to reduce the bending stresses in the resin.
  • Figure 1 shows a particular example of setting work of the process according to the invention, used to reinforce or repair a reinforced concrete beam 1 supporting a floor 2 of building.
  • this app is not limiting, and the invention can be used to reinforce any civil engineering structure, in particular concrete, metal (especially steel) or wood.
  • This reinforcement is obtained by sticking a fabric flexible 3 of carbon fibers on at least one surface of the civil engineering structure: the surface to be reinforced will be generally a surface subjected to tensile forces, in the occurrence the underside 4 of the beam 1, but it would also possible to reinforce in the same way a surface of the civil engineering structure which is subjected to efforts shear, for example the sides 5 of the beam 1 considered here, to the right of the supports 6 of this beam.
  • the resin used may for example be the resin two-component epoxy consisting on the one hand of the resin base of mark "CECA XEP 3935 / A", and on the other hand by the hardener brand "CECA XEP 2919 / B", these two components being manufactured and marketed by CECA S.A., 12 place de l'Iris, La Défense 2, Cédex 54, 92062 PARIS LA DEFENSE (FRANCE).
  • the resin used may be a thermoplastic or thermosetting resin, flame retardant or not, resistant to ultraviolet rays or not, which has the ability to adhere to both the surface of the structure of civil engineering and on carbon fibers and which is able to plug possible cracks in the surface to strengthen 4.
  • This resin has, when applied to fluid state, viscosity at application temperature (i.e. usually at room temperature) included between 1,000 and 100,000 mPa.s.
  • the resin is thixotropic when is in the fluid state, and it does not contain any solvent.
  • a resin which polymerizes is used at room temperature.
  • the fabric 3 of carbon fibers meanwhile, preferably in the form of a flexible strip 7 (see Figure 2) which extends in a longitudinal direction X and which is generally stored in the form of a roll.
  • This strip 7 is made of carbon fibers sized which form on the one hand warp threads 8 substantially continuous extending in the longitudinal direction X, and on the other hand weft yarns 9 (possibly of different size of the warp threads) extending in a transverse direction Y parallel to the width of strip 7 (or possibly in oblong directions).
  • the carbon fibers making up the fabric have tensile strength which is greater than 1,500 MPa, and an elastic modulus between 200 and 400 GPa.
  • the amount of carbon fiber in the fabric 3 in a given direction can be modulated during the manufacture of this fabric, depending on the efforts to take up with carbon fibers.
  • the steering longitudinal X of this strip is preferably parallel to these tensile forces: this is how in the example shown in the drawings, the strip 7 is arranged in parallel to the length of the beam 1.
  • the strip 7 may initially have a face on which the carbon fiber fabric 3 is left bare, and one side covered by a flexible sheet 10 of synthetic material ("polyane”) which is removably glued to the fabric 3 carbon fiber.
  • polyane synthetic material
  • the strip 7 is preferably wound with the flexible sheet 10 directed towards the outside of the roller, so as to protect the carbon fibers during storing said tape.
  • the underlying structure to strengthen risk of cracking, especially when said structure is concrete.
  • the shear forces between the strip of tissue and the underlying structure are distributed under any the length of the tip, measured parallel to the longitudinal direction of the fabric strip. The result that the shear stresses reach values lower than when the ends of the fabric strip are rectangular, so that one can thus avoiding damage and in particular cracking of the underlying structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Reinforced Plastic Materials (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Inorganic Fibers (AREA)
  • Ropes Or Cables (AREA)
  • Woven Fabrics (AREA)
  • Nonwoven Fabrics (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Knitting Of Fabric (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Claims (8)

  1. Verfahren zur Verstärkung einer Hoch- bzw. Tiefbaukonstruktion (1), das darin besteht, dass mindestens eine Schicht aus Kohlenstofffasergewebe auf eine zu verstärkende Fläche (4) geklebt wird, die zu dieser Konstruktion gehört, welches Verfahren folgende Schritte umfasst:
    a) Vorbereitung der zu verstärkenden Fläche (4),
    b) Beschichtung der Fläche (4) mit einer Epoxidharzschicht in flüssigem Zustand, die geeignet ist, an der Baukonstruktion und den Kohlenstofffasern zu haften und in der zu verstärkenden Fläche (4) eventuell vorhandene Haarrisse zu verschließen, wobei dieses Harz, wenn es im flüssigen Zustand aufgebracht wird, eine Viskosität von 1 000 bis 100 000 mPa.s hat und ferner nach dem Aushärten eine Zugfestigkeit von 5 bis 100 MPa mit einer Bruchdehnung von 0,5 bis 10 % und einer Bruchfestigkeit unter Druck von 5 bis 100 MPa mit einer Bruchverkürzung von 0,5 bis 10 % hat,
    c) und Aufbringen eines trockenen, dehnbaren Gewebes (3), das aus geschmälzten Kohlenstorffasern besteht, auf die noch flüssige Harzschicht durch Ausüben eines Drucks auf dieses Gewebe, der ausreicht, um es mit Harz zu imprägnieren und den Harzfilm zu glätten, wobei das Gewebe in mindestens einer Richtung eine Bruchfestigkeit von über 1 500 Mpa und ein Elastizitätsmodul von 200 bis 400 GPa hat, und wobei das Kohlenstofffasergewebe (3) die Form eines Streifens (7) hat, der sich entlang einer Längsrichtung (X) erstreckt, und die Kohlenstofffasern dieses Gewebes einerseits im Wesentlichen ununterbrochene und zur Längsrichtung (X) parallele Kettfäden (8) und andererseits quer verlaufende Schussfäden (9) bilden.
  2. Verfahren nach Anspruch 1, bei dem die zu verstärkende Fläche (4) Zugkräften ausgesetzt ist, wobei die Kettfäden (8) des Kohlenstofffasergewebes parallel zu diesen Kräften angeordnet sind.
  3. Verfahren nach Anspruch 2, bei dem der Streifen (7) aus Kohlenstofffasergewebe mindestens ein Längsende (7a) aufweist, das spitz zugeschnitten ist.
  4. Verfahren nach Anspruch 3, bei dem der Streifen (7) aus Kohlenstofffasergewebe zwei spitz zugeschnittene Längsenden (7a) aufweist.
  5. Verfahren nach einem der vorstehenden Ansprüche, bei dem das Kohlenstofffasergewebe (3) zunächst eine unbestückte und eine mit einer biegsamen, abnehmbaren Folie (10) versehene Seite aus Synthetikmaterial umfasst, wobei das Gewebe (3) auf den Harzfilm mit seiner unbestückten Seite aufgebracht und die Folie (10) aus Synthetikmaterial nach der Imprägnierung dieses Gewebes mit dem Harz vom Gewebe abgenommen wird.
  6. Verfahren nach einem der vorstehenden Ansprüche, bei dem das Harz im Flüssigzustand thixotrop ist.
  7. Verfahren nach einem der vorstehenden Ansprüche, bei dem das Harz kein Lösungsmittel umfasst.
  8. Verfahren nach einem der vorstehenden Ansprüche, bei dem die Baukonstruktion (1) aus einem Material besteht, das aus Beton, Metall und Holz ausgewählt ist.
EP97400756A 1996-04-04 1997-04-02 Verfahren zur Verstärkung von Konstruktionen durch angeklebte Kohlstofffasern Expired - Lifetime EP0799951B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9604250A FR2747146B1 (fr) 1996-04-04 1996-04-04 Procede de renforcement de structures de genie civil au moyen de fibres de carbone collees
FR9604250 1996-04-04

Publications (2)

Publication Number Publication Date
EP0799951A1 EP0799951A1 (de) 1997-10-08
EP0799951B1 true EP0799951B1 (de) 2002-11-27

Family

ID=9490915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400756A Expired - Lifetime EP0799951B1 (de) 1996-04-04 1997-04-02 Verfahren zur Verstärkung von Konstruktionen durch angeklebte Kohlstofffasern

Country Status (7)

Country Link
EP (1) EP0799951B1 (de)
AT (1) ATE228603T1 (de)
DE (1) DE69717337T2 (de)
DK (1) DK0799951T3 (de)
ES (1) ES2187734T3 (de)
FR (1) FR2747146B1 (de)
PT (1) PT799951E (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2788542B1 (fr) 1999-01-19 2003-01-31 Freyssinet Int Stup Reservoir de liquide pourvu d'un revetement de renforcement et d'etancheite, et procede de realisation
BE1013230A3 (nl) * 2000-01-13 2001-11-06 Immo Emergo Nv Uitwendige wapening voor balken, kolommen, platen en dergelijke.
TWI225116B (en) * 2000-06-29 2004-12-11 Nippon Oil Corp Structure reinforcing method, structure-reinforcing reinforcing fiber yarn-containing material, reinforcing structure material and reinforced structure
JPWO2003027416A1 (ja) * 2001-09-25 2005-01-06 構造品質保証研究所株式会社 構造物の補強構造、補強材料、免震装置および補強方法
FR2836502B1 (fr) 2002-02-25 2004-05-21 Freyssinet Int Stup Procede de renforcement d'une structure par un materiau composite et renfort obtenu par ce procede
CN100363585C (zh) * 2004-03-04 2008-01-23 北京特希达科技有限公司 预应力碳纤维片张拉装置
DE102006047460A1 (de) * 2006-10-07 2008-04-10 Andreas Kufferath Gmbh & Co. Kg Verstärkungsvorrichtung für den Einsatz bei Bauteilen aus vergießfähigen, aushärtenden Materialien, wie Betonwerkstoffen, sowie damit hergestellte Bauteile
FR2918689B1 (fr) * 2007-07-09 2012-06-01 Freyssinet Procede de renforcement d'un ouvrage de construction, et ouvrage ainsi renforce.
FR2948712B1 (fr) 2009-08-03 2015-03-06 Soletanche Freyssinet Procede de renforcement d'une structure de construction, et ouvrage ainsi renforce
JP6528268B2 (ja) * 2015-03-09 2019-06-12 清水建設株式会社 鉄筋コンクリート構造体の補強構造及び鉄筋コンクリート構造体の補強方法
CN109944459A (zh) * 2019-04-11 2019-06-28 华侨大学 一种采用碳纤维布加固变截面梁的加固装置及加固方法
CN110514496B (zh) * 2019-09-02 2022-07-12 卡本科技集团股份有限公司 一种碳纤维网格加固混凝土梁端部的锚固试验方法
MX2022004404A (es) * 2019-10-28 2022-05-20 Sika Tech Ag Resina de impregnacion para una tela tejida o cosida.
FR3139149A1 (fr) 2022-08-26 2024-03-01 Soletanche Freyssinet Procédé pour renforcer un ouvrage de construction et dispositif pour un tel procédé

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1490102A (en) * 1975-09-08 1977-10-26 Balfour Beatty Ltd Artificial and natural structures
DE69001440T2 (de) * 1989-01-12 1993-12-09 Mitsubishi Chem Ind Verfahren zur Verstärkung von Betonstrukturen.
US5308430A (en) * 1990-01-30 1994-05-03 Makoto Saito Reinforcing fiber sheet, method of manufacturing the same, and the method of reinforcing structure with the reinforcing fiber sheet
US5218810A (en) * 1992-02-25 1993-06-15 Hexcel Corporation Fabric reinforced concrete columns
US5649398A (en) * 1994-06-10 1997-07-22 Hexcel-Fyfe L.L.C. High strength fabric reinforced walls
GB9501193D0 (en) * 1995-01-21 1995-03-15 Devonport Management Ltd Reinforced material

Also Published As

Publication number Publication date
EP0799951A1 (de) 1997-10-08
FR2747146A1 (fr) 1997-10-10
DE69717337T2 (de) 2003-10-16
FR2747146B1 (fr) 1998-07-10
DK0799951T3 (da) 2003-03-24
ATE228603T1 (de) 2002-12-15
DE69717337D1 (de) 2003-01-09
PT799951E (pt) 2003-03-31
ES2187734T3 (es) 2003-06-16

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