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
  • 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
  • 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

• Reinforcing element method for producing such a reinforcing element and component, equipped with a
• the invention relates to a reinforcing element, as it can be used preferably for stabilizing and reinforcing components on buildings, a method for producing such a reinforcing element and a component equipped with a reinforcing element.
• Reinforcing elements of the type in question here are on the one hand in a new building of considerable importance, for example, to ensure the seismic safety of the building.
• older buildings can be retrofitted with such reinforcing elements, because a component to be reinforced, for example, due to excessive stresses damage that must be corrected.
• materials with high tensile strength for the reinforcement of components.
• fiber-reinforced plastics are particularly suitable. These have in addition to the high tensile strength mentioned also a very low weight and are easy to handle.
• fiber-reinforced plastics can be processed very easily. Subsequent reinforcement of reinforced concrete is thus possible without difficulty.
• CFRP materials Carbon fiber-reinforced plastics (CFRP materials), for example, can be used in lamellar form for the transverse reinforcement of bridges, for increasing the payload of ceilings and for stiffening wooden structures. Columns and pillars are also secured with CFRP laminates only a few millimeters thick.
• reinforcing elements such as steel straps and carbon or glass fiber fabrics, are also used to provide stabilization
• the subsequent steel reinforcement of components in the construction sector is characterized by a very complex production. Furthermore, this sometimes results in considerable corrosion problems. Due to the relatively high weight of a steel reinforcement, the applications are difficult, that is, the adaptation to the component is not readily possible. In addition, optical impairments result from such steel reinforcements, which are undesirable for certain components of buildings.
• the invention has for its object to provide reinforcing elements for reinforcing components, which avoid the disadvantages of previous reinforcing elements.
• a method is provided which allows the production of such a reinforcing element.
• a reinforcing element which consists of a fiber-reinforced profile and in which the forming region is located in a section of an imaginary perpendicular to the raw profile level, said plane at an acute angle ⁇ against the longitudinal direction of the profile is twisted.
• the fibers of the reinforcing element is hardly loaded and stretched by the forming process, so that pre-damage within the reinforcing element can be effectively avoided.
• the reinforcing element acts like a free tension member without composite. It can be used both to prevent fractures of components in the construction sector, as well as to prevent these components as a precaution from damage to protect themselves against aging processes.
• the reinforcing element according to the invention makes it possible to increase the load capacity of the components equipped with this reinforcing element.
• the reinforcing element can be used flexibly and can be provided without great effort on the components to be reinforced.
• the reinforcing element according to the invention can be brought into the desired shape by a forming process before it is fastened to a component.
• a reinforcing element is available, which can be placed directly on the component to be amplified and connected to this.
• the reinforcing element can be prefabricated, the production cost is not incurred in the construction phase, so not on site on the building, so that this results in the construction phase considerable time and cost advantages.
• the profile may be a flat profile, a U-profile, a T-profile or an L-profile.
• Decisive for the choice of the profile is exclusively to be achieved by means of the reinforcing element strength and adaptability to the component to be reinforced.
• the reinforcing element is attachable at an angle ⁇ with respect to the longitudinal extent and thus fulfills the general inventive concept.
• a component in the context of the present invention are in particular structures, parts of structures or beams to be understood as parts of buildings in the construction sector.
• the said beams are provided on reinforced concrete ceilings, bridge girders, for example in the longitudinal and / or transverse direction and serve, for example, the reinforcement of wall outbreaks or wall openings.
• a reinforcing element according to the invention can be used when displacing falls, such as window or door lintels.
• the reinforcing element can have an anchoring part at least at one of its ends. This anchoring part serves for additional attachment of the reinforcing element to the component to be reinforced.
• the anchoring part can proceed from the cross-section of the profile, starting in a polygonal or cycloidal cross-section.
• the anchoring part has a polygonal or cycloidal cross-section.
• the anchoring part is made Stationaryrig. Multi-limbed here means that the end of the anchoring part into individual segments or sections is divided or in the simplest case has at least one recess. This can be used, for example, to receive a fastener or to guide such a fastener through the thus formed openings or recesses.
• the anchoring part has a geometry suitable for receiving or carrying out a fastening element.
• a fastener may represent a dowel, a screw, a rivet or a similar means. This must only be suitable to produce a detachable or permanently fixed connection between the reinforcing element and the component to be reinforced in the region of the anchoring part.
• the anchoring part can be inserted into a recess of the component.
• a cohesive connection can be, for example, an adhesive connection.
• the reinforcing element is produced from thermoplastic or thermosetting matrix resin, then this is liquid in the raw state and solidifies during or after processing.
• the matrix resin is applied to the component to be reinforced and integrally bonds to it by hardening.
• the connection thus created is weather-resistant and corresponds to the requirements placed on the component to be reinforced.
• the reinforcing element is formed by high-modulus carbon fibers, wherein the fiber direction of the reinforcing element can be unidirectionally aligned.
• an FRP element fiber-reinforced polymer element
• the reinforcing element is a FRP tension element or an FRP shear angle.
• Reinforcing element can be made prior to application to the component to be reinforced and not only at the construction site or on the component must be generated.
• the reinforcing element consists in particular of carbon, glass, aramid or basalt fiber material with a high Exa value and high tensile strength.
• Reinforcing element is formed.
• the Anformung can be done in one or more consecutive steps.
• the anchoring part is worked out directly from the reinforcing element. This results in a uniform fabric structure, which has an overall positive effect on the strength values of the reinforcing element.
• a component with a reinforcing element according to the invention is the subject of the invention, wherein the reinforcing element is attached to the component at an angle ⁇ relative to the longitudinal extent of the component.
• Reinforcing element and component are integrally connected to one another according to an embodiment of this component.
• the cohesive connection can be produced by the adhesive effect inherent in the fiber-reinforced plastic or a separate adhesive material.
• a component according to the invention with a reinforcing element is also characterized in that the reinforcing element has at least one anchoring part provided on the reinforcing element and a connection between the reinforcing element and the component is formed via this anchoring part by means of a fastening element.
• This compound can be a detachable or permanently solid compound.
• the component with the reinforcing element has at least one anchoring part provided on the reinforcing element, which can be inserted into a recess of the component.
• FIG. 1A shows an inventive reinforcing element in the form of a
• FIG. 3 shows the production of a further inventive device
• Reinforcing element which is made of two round profiles; 4 shows another reinforcing element with a specially shaped
• Anchoring part; 5 shows a component equipped with an inventive
• a reinforcing element as a blank is shown schematically in FIG. 1A.
• the blank is a flat profile 1, also referred to below as raw profile, produced from a so-called prepreg based on thermoplastic or thermosetting matrices.
• the fiber course is preferably unidirectional in such a component.
• the profile 1 shown has a forming area 2. This forming area is rotated at an angle ⁇ relative to the longitudinal direction of the profile 1.
• the forming area 2 is defined as being the intersection of an imaginary plane perpendicular to the plane formed by the profile, this plane being rotated at an angle ⁇ to the longitudinal direction of the profile and thus the possible unidirectional fibers.
• the angle ⁇ is an acute angle and is in the range of 20 to 70 °, preferably in the range of 30 to 60 °, more preferably in the range of 40 to 50 °, most preferably 45 °.
• FIG. 1B shows a stage plan for producing a first embodiment of a reinforcing element according to the invention.
• a profile 1 produced as a flat profile is produced from a so-called prepreg based on thermoplastic or thermosetting matrices.
• the fiber course is preferably unidirectional in such a component.
• the profile 1 shown has a forming region 2, which results from a local short-term heating.
• a localized portion can be changed in material properties to thereby produce the ⁇ -tilted FRP profile.
• the individual layers of the prepreg can be stacked discontinuously or continuously one above the other and pressed together under the influence of temperature and pressure or formed into a one-piece component. If a warming has taken place, a final cooling is necessary.
• thermoplastic flat profiles should be mentioned as starting materials, which are heated only in the intended range of curvature and converted accordingly.
• the height of the heating temperature is adjusted so that the plastic matrix can soften locally and for a limited time, wherein the softening state can take place in a liquefaction region.
• After the forming of the flat profile to the inclined by ⁇ FRP shear angle is a brief cooling, so that the profile 1 remains in its final position and can be applied directly to the component to be amplified.
• the fibers, in particular high modulus carbon fibers are not damaged.
• the efficiency is improved by the inventive reinforcing elements and provided a system that combines all advantages in terms of cost and material usage.
• Reinforcing element is shown in detail as a stadium plan in Figure 2.
• unidirectionally reinforced thermoplastic round profiles which have the same cross-sectional area as the final product.
• Such round profiles are heated again with the exception of the anchoring part and pressed into a flat profile.
• the profile 1 in the left part of the figure 2 represents the round profile as a blank and the profile 1 in the middle of Figure 2, the already pressed flat profile with the still undeformed anchoring part 4.
• the temperature and the pressure conditions are adjusted during the forming such that the plastic matrix can be softened or liquefied in the forming region 2 for a limited period of time.
• the cooling of the profile takes place 1.
• the anchoring part 4 is brought into its final form.
• the section A is shown enlarged in the last, lower part of the image.
• the anchoring part 4 initially having a cycloidal cross-section has now been pressed into a flat shape.
• the reinforcing element according to the invention as a whole can also be produced from two individual round profiles 1.1 and 1.2. Different approaches are available.
• a layered application of flat strips of the fiber composite material can take place between the round profiles 1.1 and 1.2 so that overall the flat profile 1 shown in the middle of FIG. 3 is produced which has only two finger-like anchoring parts 4.1 and 4.2 at its ends. Between these finger-like anchoring parts 4.1 and 4.2, a recess 6 provided for the fastening element 5 is present.
• a local and temporally limited heating of the forming region 2 takes place, as described in detail in the abovementioned variants, so that the profile 1 can be brought into its end position in the region of this forming region 2.
• the reinforcing element according to the invention can be produced easily and simply with a few process steps.
• a further variant is also to convert the original round profiles 1.1 and 1.2 by a suitably suitable forming process in a flat profile 1. In this case, a heating can be provided.
• the special design of the reinforcing element according to Figure 4 is that the anchoring part 4 has a circular cross-section.
• this anchoring part 4 was again bent in relation to the profile 1, which was already reshaped in FIG. 4 in the area of the forming region 2, so that a multi-curved profile 1 results. That is, here, the profile 1, a second forming region 2, which was not designated in detail in Figure 4, on.
• a use case for the present invention is shown by way of example in FIG. 5.
• a component 3 which in the present case consists of a simple beam which is rectangular in cross-section, is provided with a reinforcing element according to the invention.
• the reinforcing element consists of the profile 1 and two anchoring parts 4.1 and 4.2. These anchoring parts 4.1 and 4.2 are introduced in the embodiment shown in recesses of the component 3 and anchored therein.
• the profile 1 in each case has the same angle ⁇ with respect to the longitudinal extension of the component 3 to be reinforced as the deformation region 2. This angle in each case refers to the longitudinal extension of the side surface of the component 3 to be reinforced provided with the reinforcement element.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Mechanical Engineering (AREA)
• Moulding By Coating Moulds (AREA)
• Reinforced Plastic Materials (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

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• 2006
  • 2006-07-21 EP EP06117647A patent/EP1881125A1/fr not_active Ceased
• 2007
  • 2007-07-20 DE DE502007003614T patent/DE502007003614D1/de not_active Expired - Fee Related
  • 2007-07-20 AT AT07787774T patent/ATE466149T1/de active
  • 2007-07-20 WO PCT/EP2007/057524 patent/WO2008009744A1/fr not_active Ceased
  • 2007-07-20 EP EP07787774A patent/EP2047046B1/fr active Active

Non-Patent Citations (1)

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