EP0996797A1 - Bauteil - Google Patents
BauteilInfo
- Publication number
- EP0996797A1 EP0996797A1 EP98943699A EP98943699A EP0996797A1 EP 0996797 A1 EP0996797 A1 EP 0996797A1 EP 98943699 A EP98943699 A EP 98943699A EP 98943699 A EP98943699 A EP 98943699A EP 0996797 A1 EP0996797 A1 EP 0996797A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slot
- component
- reinforcement element
- base body
- reinforcement
- 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.)
- Granted
Links
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 invention relates to a component with at least one reinforcement element that is at least sectionally flat, the main body of the component consisting essentially of a hydraulically bound matrix.
- a component with at least one reinforcement element that is at least sectionally flat, the main body of the component consisting essentially of a hydraulically bound matrix.
- An example of such a component is a concrete component with or without reinforcement.
- German Patent 43 33 782 describes a method for attaching additional reinforcement to a reinforced concrete component, in which grooves are first made in the surface of the concrete component using a high-pressure water jet. Reinforcing steel elements are then arranged in the grooves. The grooves are then filled with concrete again, whereby the reinforcement elements are embedded in the concrete and thus fixed in the grooves.
- German patent specification 43 33 782 proves to be problematic in practice in several respects.
- the grooves created in the concrete component must be relatively large, since the steel reinforcement elements take up a relatively large amount of space.
- filling the grooves with shotcrete requires a minimum order thickness that is adapted to the maximum.
- a minimum thickness of the concrete cover for the reinforcement elements must be observed in order to prevent corrosion of the reinforcement elements.
- the subsequently integrated reinforcement elements should be threaded into any existing reinforcement of the component, which is often very complex. Since large amounts of water are obtained in the known method, in particular when creating the grooves in the component, the method can be used only to a very limited extent. An application inside buildings is practically impossible. Overall, the well-known Processes with a comparatively large effort and therefore associated with relatively high costs.
- lamellae made of carbon fiber reinforced plastics are glued to the surface of the component.
- the surface of the component must be prepared in a suitable manner, namely by blasting, grinding or the like and applying an adhesive bridge or a scratch filler.
- the method can only be used to a limited extent, which is due to the fact that the bond between a concrete component and a glued-on reinforcement is relatively rigid.
- the possible displacements in the adhesive bond up to breakage are in the range of less than 0.2 mm, while the possible displacements of ribbed steel concreted in are in the range of 1 mm.
- the combination of a concrete reinforcement made of concrete is therefore significantly more ductile.
- the adhesive bond allows only a relatively small introduction of force into the lamella. This application of force is also heavily dependent on the existing concrete quality and the resulting adhesive tensile strength.
- the slat can only be used to a maximum of 40% of the tensile strength.
- a further limitation of the possible applications of glued-on fiber-reinforced lamellas as additional reinforcement is that the component surface may only have unevenness of less than 5 mm with a measuring length of 2 m. Also an application for components where shear cracks are computationally possible, i.e. for components with the required shear reinforcement, is problematic because in this case a so-called peeling fracture can occur as a result of a shear crack offset. Finally, it should also be noted that a glued-on reinforcement must always be protected against mechanical damage and that special precautions must be taken in the event of a fire to prevent the reinforcement from failing.
- the invention is based on the object of specifying a component of the type in question with reinforcement in the form of flat reinforcement elements, which is relatively ductile with good wearing behavior.
- the component according to the invention achieves the above object by the features of claim 1.
- the component mentioned at the outset is designed such that the reinforcement element is arranged at least in sections in a slot in the surface of the base body and is fixed at least over an anchoring length in the slot and so on is connected to the base body.
- both the carrying and the deformation properties of a component are determined essentially by the type and arrangement of the reinforcement elements and the type of connection between the base body of the component and the reinforcement elements. Furthermore, it has been recognized that flat reinforcement elements are well suited for reinforcing concrete components. According to the invention, it is proposed to arrange the flat reinforcement elements in suitable recesses in the surface of the component, namely in slots, so that each reinforcement element is bilateral, i.e. can be connected to the base body of the component via its two main surfaces. This type of arrangement of the reinforcement elements proves to be sufficiently close to the surface in order to ensure good wearing behavior of the component. In addition, a ductile bond behavior can be achieved in this way that comes close to that of a concrete reinforcement made of concrete.
- the flat reinforcement elements in the component according to the invention Due to the special arrangement of the flat reinforcement elements in the component according to the invention, relatively large forces can be anchored.
- the reinforcement element is therefore well used here.
- the bond behavior of the component according to the invention is so ductile that no brittle fracture is to be expected. The power transmission is not disturbed by thrust or bending cracks.
- the reinforcement method according to the invention proves to be advantageous for various reasons.
- the quality of the component body in particular the adhesive tensile strength of which is of minor importance for the application of the reinforcement method according to the invention.
- Unevenness in the surface of the base body can be easily corrected by a corresponding slot depth. Slots, as are required for an arrangement of the flat reinforcement elements according to the invention, can be produced simply and inexpensively by cutting in the base body of the component. Such slots can also be produced indoors. A further surface treatment is not necessary here.
- the reinforcement elements are arranged at least in sections in slots in the surface of the component, the reinforcement elements or the bond between the base body of the component and the reinforcement elements are largely protected against mechanical damage, so that the reinforcement elements do not completely lose their functionality even in the event of a fire.
- the reinforcement of the component according to the invention is relatively stable.
- the load-bearing capacity of the component does not only depend on the tensile strength of the material of the base body, but is also largely determined by the reinforcement.
- the reinforcement element is designed in the form of a strip-shaped lamella.
- a reinforcement element can simply be arranged in a slot in such a way that the two main surfaces of the reinforcement element are oriented parallel to the side walls of the slot. If the depth of the slot then corresponds at least to the width of the strip-shaped lamella, the reinforcement element can even be arranged in the slot in such a way that it does not protrude from the surface of the base body, that is to say it is completely protected against mechanical damage or other adverse environmental influences.
- the reinforcement element has an L-shaped or T-shaped profile, at least in sections. Such a reinforcement element is then arranged with a first section of its profile in the slot in the base body of the component, so that at least a further section of its profile rests on the surface of the base body.
- Reinforcement elements of this type have a larger loading than strip-shaped reinforcement elements. reinforcement cross-section, although they do not differ from strip-shaped reinforcement elements in terms of their arrangement and fixation in the base body of the component.
- Reinforcement elements with an L- or T-shaped profile are particularly advantageous if only slots with a relatively small depth can be made in the surface of the base body, for example in the case of components that already have reinforcement close to the surface. Components of this type can then be provided with reinforcement elements which have a relatively large reinforcement cross section, despite the small slot depth. By fixing these reinforcement elements in the slots, the component shows an overall comparatively good ductile behavior.
- the reinforcement element is fixed in the slot at least over an anchoring length. It is particularly advantageous if the reinforcement element is fixed at the end in the slot. As a rule, an end fixation of the reinforcement element is sufficient to introduce the forces that occur.
- the reinforcement element in the slot.
- a bond is created between the reinforcement element and the base body in the area of the slot.
- the reinforcement element can also be mechanically fixed in the slot of the base body. The mechanical fixing of the reinforcement element also enables the reinforcement element to be prestressed, which significantly improves the possible uses of the component according to the invention.
- the reinforcement element could be provided with a thickening which is arranged in a corresponding extension of the slot.
- the slot could be enlarged at one point by a hole. Due to the thickening arranged in the expansion of the slot, the reinforcement element is mechanically held in the slot at one point and can now also be prestressed.
- the reinforcement element comprises at least one anchoring part for mechanical fixing in the slot.
- a lamella with an L- or T-shaped profile could serve as anchoring part, in that a first section of this profile is arranged in the slot in the surface of the base body and fixed there.
- such a reinforcement element comprises at least one section in the form of a strip-shaped lamella.
- This lamella could be connected to the anchoring part, for example, via the section of its profile which rests on the surface of the base body, and could also rest on the surface of the base body.
- the lamella could equally well be connected to the section of the anchoring part arranged in the slot and arranged in a corresponding extension of the slot.
- the anchoring part can be arranged at any point on the reinforcement element; in practice, however, it proves to be advantageous if the anchoring part is arranged at the end of the reinforcement element, or two anchoring parts are provided at the ends of the reinforcement element.
- the slots are oriented essentially perpendicular to the surface of the base body.
- the present invention can also be implemented with a different orientation of the slots.
- the reinforcement elements are fixed in the slot at least over an anchoring length.
- it can also be advantageous to fix a reinforcement element in the slot over its entire length.
- reinforcement elements made of very different materials can be used in the component according to the invention.
- reinforcement elements made of a plastic with a fiber reinforcement preferably in the form of carbon fibers, aramid fibers and / or glass fibers
- Reinforcement elements of this type are corrosion-resistant and have a very high tensile strength with a small cross-section, so that overall only relatively small slot depths are required.
- a reinforcement element can be fixed mechanically in the slot. As a rule, however, a bond is made between the reinforcement element and the base body in the area of the slot. Adhesives based on epoxy resin or polyester resin are suitable for this.
- the reinforcement element can also be fixed in the slot with the aid of a cement suspension, preferably a fine cement milk.
- the invention also relates to a method for attaching additional reinforcement to a concrete component, in which at least one slit is created in the surface of the concrete component, the slit being filled at least in regions with a binder, an at least sectionally flat reinforcement element made of a fiber-reinforced Plastic is arranged at least in sections in the slot and the binder which is displaced and emerges from the slot is removed.
- the slot could advantageously either be cut or milled.
- a suitable adhesive or a self-setting cement suspension could be used as the binder.
- FIG. 1 is a perspective view of a first embodiment for a component according to the invention
- Fig. 2 is a perspective view of a second embodiment of a component according to the invention.
- FIG. 3 shows a perspective illustration of a third exemplary embodiment of a component according to the invention.
- 1 shows a component 1, the base body 2 of which consists of a hydraulically set matrix - here concrete.
- the component 1 further comprises a flat reinforcement element 3.
- This reinforcement element 3 is arranged in a slot 4 which is introduced into the surface 5 of the base body 2.
- the reinforcement element 3 is also fixed at least over an anchoring length in the slot 4 and thus connected to the base body 2.
- the reinforcement element 3 shown in FIG. 1 is a strip-shaped lamella, the width of which essentially corresponds to the depth of the slot 4.
- the reinforcement element 3 is now arranged in the slot 4 so that it does not protrude from the surface 5 of the base body 2.
- the slot 4 is oriented essentially perpendicular to the surface 5 of the base body 2.
- the reinforcement element 3 is fixed in the slot 4 over its entire length with the aid of a suitable binding agent 6.
- a cement suspension or an adhesive matched to the material of the reinforcement element 3 can be used as the binder 6.
- a fiber-reinforced plastic has proven itself as the material for the reinforcement element, in particular a carbon fiber plastic or also a plastic with a reinforcement made of aramid fibers and / or glass fibers. Reinforcement elements of this type can be easily fixed using epoxy resin adhesives or polyester resin adhesives.
- the component 1 shown in FIG. 1 is a concrete component subsequently provided with additional reinforcement in the form of the flat reinforcement element 3.
- the slot 4 was first created in the surface 5 of the component 1.
- the slot 4 can be cut or milled, for example.
- the slot 4 was then filled at least in regions with a binder 6, namely a suitable adhesive or a cement suspension.
- the flat reinforcement element 3, which in the present case is formed by a fiber-reinforced plastic lamella was arranged in the slot 4. At least one was Part of the binder 6 displaced from the slot 4. This leaked binder has finally been removed.
- the slot 4 is about 3 mm wide and about 3 cm deep. It extends to a maximum of any internal reinforcement of the component 1.
- the plastic lamella 3 has a thickness of approximately 1.5 mm and a height of approximately 27 mm.
- the dimensioning and arrangement of the reinforcement element 3 in the slot 4 shown in FIG. 1 ensures that the reinforcement element 3 is completely embedded in the binding agent 6 in the slot 4. In this way, a particularly good bond between the reinforcement element 3 and the base body 2 of the component 1 is produced. In addition, the reinforcement element 3 is also protected against mechanical and other adverse external influences.
- the reinforcement element used here is not a strip-shaped lamella, as in the case of the component shown in FIG. 1, but a combination of one or more anchoring parts 8 and a strip-shaped lamella 9.
- the anchoring part 8 has a T-shaped profile. A first section of this profile is glued in the slot 4, while the other two sections of the profile are arranged on the surface 5 of the base body 2. In addition, there can also be an adhesive connection between these two sections of the profile and the surface 5 of the base body 2.
- the strip-shaped lamella 9 is now connected to the two sections of the profile of the anchoring part 8 arranged on the surface 5 of the base body 2.
- the strip-shaped lamella 9 can also be glued to the surface 5 of the base body 2.
- the reinforcement element can also be attached to the component 7 as a whole in a prestressed manner.
- the slot 4 in the base body 2 of the component 10 shown in FIG. 3 has an extension 11 in the form of a bore at the end.
- this extension 11 the end of a strip-shaped reinforcement element 3, provided with a thickening 12, is attached. arranges. This mechanical fixation of one end of the reinforcement element 3 allows the reinforcement element 3 to be pretensioned as a whole.
- reinforcement elements in the form of fiber-reinforced plastic slats are particularly well suited for realizing the component according to the invention or for subsequently attaching additional reinforcement to a concrete component. This is due in particular to the very high tensile strength of such slats, even with small cross sections.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Joining Of Building Structures In Genera (AREA)
- Rod-Shaped Construction Members (AREA)
- Glass Compositions (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Braking Arrangements (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19730174 | 1997-07-15 | ||
DE19730174A DE19730174C2 (de) | 1997-07-15 | 1997-07-15 | Bauteil |
PCT/DE1998/001974 WO1999004116A1 (de) | 1997-07-15 | 1998-07-15 | Bauteil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0996797A1 true EP0996797A1 (de) | 2000-05-03 |
EP0996797B1 EP0996797B1 (de) | 2001-09-12 |
Family
ID=7835687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98943699A Expired - Lifetime EP0996797B1 (de) | 1997-07-15 | 1998-07-15 | Bauteil |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0996797B1 (de) |
AT (1) | ATE205568T1 (de) |
DE (2) | DE19730174C2 (de) |
PL (1) | PL198884B1 (de) |
WO (1) | WO1999004116A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2711484A3 (de) * | 2012-09-19 | 2015-11-18 | Bilfinger Construction GmbH | Bauteil mit einem flächigen Bewehrungselement |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19815823C2 (de) * | 1998-04-08 | 2000-11-30 | Bilfinger Berger Bau | Verankerungsvorrichtung für Zugglieder |
DE19914847A1 (de) * | 1999-04-01 | 2000-10-26 | Bilfinger Berger Bau | Verankerung für ein flächiges Bewehrungselement aus Kunststoff |
DE102012210877A1 (de) * | 2012-06-26 | 2014-03-27 | Bilfinger SE | Bauteil und Verfahren zur Bewehrung eines Bauteils |
US20140099456A1 (en) * | 2012-10-09 | 2014-04-10 | Venkatkrishna Raghavendran | Fiber reinforced polymer strengthening system |
US10801221B2 (en) * | 2017-01-09 | 2020-10-13 | Robert Luke Secrest | Device for stabilizing and repairing cracks in concrete structures and a method for its use |
DE102021103589B4 (de) | 2021-02-16 | 2024-01-18 | Hans Graf Bauunternehmung GmbH & Co. KG | Betonbewehrungselement |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2451639B2 (de) * | 1974-10-30 | 1979-08-23 | Hans 8501 Behringersdorf Binker | Verfahren zum Restaurieren von Holzbalken |
NL190245C (nl) * | 1986-03-25 | 1993-12-16 | Dick Klapwijk En Elsa Louise K | Werkwijze voor het repareren van een houten balk. |
FR2606057B1 (fr) * | 1986-11-04 | 1990-10-12 | Wolf Philippe | Renforcement d'elements de charpente par insertion de plaques a haute resistance |
FR2691739B1 (fr) * | 1992-06-02 | 1999-09-17 | Renofors France | Procede de renforcement d'une poutre deterioree en beton arme et poutre obtenue selon ce procede. |
DE4333782C2 (de) * | 1993-10-04 | 1999-10-21 | Roedl Gmbh | Verfahren und Vorrichtung zur Anbringung einer Zusatzbewehrung an einem armierten Betonbauteil |
FR2728293A1 (fr) * | 1994-12-14 | 1996-06-21 | Brochard Francois Xavier | Perfectionnement aux dispositifs de renforcement des charpentes en bois |
US5476340A (en) * | 1994-12-21 | 1995-12-19 | Contrasto; Sam | Method of using internal metal stitching for repairing cracks in concrete |
DK0803020T3 (da) * | 1995-01-09 | 1999-06-14 | Empa | Befæstigelse af forstærkningslameller |
-
1997
- 1997-07-15 DE DE19730174A patent/DE19730174C2/de not_active Expired - Fee Related
-
1998
- 1998-07-15 EP EP98943699A patent/EP0996797B1/de not_active Expired - Lifetime
- 1998-07-15 WO PCT/DE1998/001974 patent/WO1999004116A1/de active IP Right Grant
- 1998-07-15 AT AT98943699T patent/ATE205568T1/de not_active IP Right Cessation
- 1998-07-15 PL PL338141A patent/PL198884B1/pl not_active IP Right Cessation
- 1998-07-15 DE DE59801466T patent/DE59801466D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9904116A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2711484A3 (de) * | 2012-09-19 | 2015-11-18 | Bilfinger Construction GmbH | Bauteil mit einem flächigen Bewehrungselement |
Also Published As
Publication number | Publication date |
---|---|
DE19730174A1 (de) | 1999-02-11 |
DE19730174C2 (de) | 2001-12-06 |
ATE205568T1 (de) | 2001-09-15 |
PL338141A1 (en) | 2000-09-25 |
PL198884B1 (pl) | 2008-07-31 |
EP0996797B1 (de) | 2001-09-12 |
DE59801466D1 (de) | 2001-10-18 |
WO1999004116A1 (de) | 1999-01-28 |
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