KR20000070791A - Flat strip lamella for reinforcing building components and method for placing a flat strip lamella on a component - Google Patents

Abstract

The present invention relates to a planar strip lamella 10 for reinforcing a building component that bears or transmits a load such as concrete, wood, steel, natural stone or stone. The planar strip lamella 10 has a composite structure of a plurality of bendable or stretchable reinforcing fibers 26 arranged in parallel and a bonding matrix 28 that connects the reinforcing fibers with each other to be shear resistant. This lamellae can be attached to the building component to be reinforced using an adhesive. The bonding matrix 28 is made of a thermoplastic composite to bend the planar strip lamellae over the corner edges of the building components.

Description

FLAT STRIP LAMELLA FOR REINFORCING BUILDING COMPONENTS AND METHOD FOR PLACING A FLAT STRIP LAMELLA ON A COMPONENT}

Reinforcing lamellae of this type are known from WO96 / 21785. The reinforcing lamella is applied to vertically extending flat building materials. Reinforcing lamellas cured with a binder matrix, especially epoxy resins, cannot bend with a small bending radius and thus cannot form bow-shaped reinforcements that extend beyond the corners of building materials. Bow-shaped stiffeners or sheaths are necessary, for example, to connect the compression zones and tension zones in steel reinforced concrete girders or steel reinforced concrete T-beams and to prevent stress and transverse cracking.

The present invention relates to a planar strip lamella for reinforcing load bearing or load-bearing building materials, comprising a plurality of stretchable reinforcing fibers arranged in parallel with each other and a composite structure of a binder matrix connecting the reinforcing fibers to each other in a shear resistance manner. It can be attached by facing the outer surface of the building material by means of an adhesive. The invention also relates to a method of applying a planar strip lamellae of this type to building materials.

1A is a plan view of a reinforcing lamella.

FIG. 1B is an enlarged cross-sectional view taken along the line B-B in FIG. 1A.

2 is a cross-sectional view of a steel reinforced concrete T-beam to which the bow-shaped reinforcing lamella is applied.

3 is one end of a reinforcing lamella that may be introduced into a recess of building materials.

Figure 4 is a tension control device for applying the reinforcing lamellas pre-tensioned to the building materials.

5 is a side cross-sectional view of a columnar building material to which a spirally wound reinforcing lamellar is applied.

* Code Description

10 ... flat strip lamellar 12 ... construction materials

16 ... adhesive 22 ... cross beam

24 ... corner edge 26 ... elastic reinforcement

28 ... thermoplastic binder matrix 30 ... intermediate region

32, 34 ... free end 35 ... recessed

36 ... free end 38 ... drum-type tensioning element

39 ... arrows

The present invention relates to the development of a flat strip lamella that can extend beyond the corner of the building material to reinforce the building material. The invention also relates to a method of applying a flat strip lamellae of this type to a building material.

For this purpose a combination of the properties described in claims 1 and 6 to 9 is proposed. Further details of the invention can be found in the dependent claims.

The present invention is based on the recognition that the elasticity of planar strip lamellas is largely determined by the binder matrix. In the present invention, the binder matrix is made of thermoplastic resin to guide the flat strip lamella to the outer surface of the bent building material and the corner of the building material. This type of flat strip lamella is applied to the outer contour of the building material to be deformed and reinforced by local temperature increase. The glass transition temperature of the thermoplastic resin used to reinforce the reliable operation is preferably 100 ° C or higher and the melting point should be 160 ° C or higher. Local heating of planar strip lamellas can be done on site using a hot air gun.

The binder matrix is a thermoplastic resin selected from polyolefin vinylpolymers, polyamides, polyesters, polyoxymethylenes, polycarbonates, thermoplastic polyurethanes and ionomers.

The reinforcing fibers are formed from carbon fibers characterized by particularly high elastic modulus. However, the reinforcing fibers may include aramid fibers, glass fibers, polypropylene fibers.

In order to apply the longitudinally extending flat strip lamellae of the invention onto the corners of the building material to be reinforced, the flat strip lamellae are heated to a temperature above the glass transition temperature of the thermoplastic binder in the middle region guided over the corners of the building material and It is bent while heated at an angle corresponding to the corner or edge angle and attached to the building material over the edge of the building material by means of adhesive layers before or after cooling.

The use of a thermoplastic binder matrix makes it possible to apply planar strip lamellae to the exterior of building materials in pretensioned condition. The free end of the flat strip lamella protruding beyond the surface of the building material to be reinforced may be stretched or bent and fixed using a tensioning element in a heated state. The tensioning elements can be tensioned relative to one another so that the flat strip lamella can be attached to the building material outer surface in a pretensioned state. A tension control device may be provided spaced apart from the building material to tension the tension control element. The tensioner is engaged only at the free end of the flat strip lamella when one end of the lamella is fixed to the exterior of the building material by a suitable tensioning element.

The use of the thermoplastic binder matrix of the present invention may compress the free end of the planar strip lamellae in a wave or zigzag form under the action of pressure and heat. The lamellar ends deformed in this way to secure shape retention are introduced into an adhesive-filled building recess so that the zigzag area is filled with a paste-like adhesive material and a conformable connection is made after the adhesive cures.

Flat strip lamellas comprising the thermoplastic binder matrix of the present invention may be used to reinforce columnar building materials. The flat strip lamella heated to a temperature above the glass transition temperature of the binder matrix is spirally wound and wound around the column building material coated with a fluid reactive adhesive on the outer surface, and then cooled to room temperature and the adhesive is cured at the same time. Separation is maintained between the spiral windings of the flat strip lamella to prevent liquid from collecting underneath the wound flat strip lamella.

In order to improve the bonding between the planar strip lamellae and an adhesive such as an epoxy resin, it may be advantageous to expose, by polishing, the reinforcing fibers on the face to be bonded.

The planar strip lamellas 10 are designed for post reinforcement of building materials 12 such as steel reinforced concrete structures and stone structures. The lamellae is fixed to the building material 12 at the free ends 32 and 34 and supplementally to the one side 14 with respect to the outer surface of the building material using an adhesive 16 such as epoxy resin (FIG. 2).

The building material 12 according to FIG. 2 is formed as a steel reinforced concrete T-beam, where the lamella 10 extends over the cross beam 22 of the building component 12 in a bow shape so that It is bent over the corner edge 24.

The planar strip lamella 10 has a composite structure of a binder matrix that connects the plurality of bendable or stretchable carbon reinforcing fibers 22 arranged in parallel with the reinforcing fibers in a shear resistance manner, wherein the binder matrix is made of thermoplastic resin. do. Thanks to the thermoplastic binder matrix 28, the planar strip lamellas are relatively hard at service temperatures and plastically deformable upon heating to temperatures above the glass transition temperature. To initially guide the flat strip lamella 10 extending longitudinally over the corner 24, the lamella in the intermediate region 30 is heated to a temperature above the glass transition temperature of the thermoplastic binder matrix and bent at about 90 ° to the edge angle. All. These bends remain after cooling to service temperature.

In Fig. 2, the side end 32 of the planar strip lamella is plastically deformable under increased temperature, which is an advantage in the fixing process. The bent end 32 is secured to the building component 12 using an adhesive 16. At the other free end 34 the planar strip lamellae undergo a zigzag deformation which is under the action of pressure and heat. Using this end 34, the flat lamella 10 penetrates into the adhesive filling recess 35 of the building component 10, enabling a secure fit to the shape during curing of the adhesive in the recess.

In FIG. 4 the free end 36 of the planar strip lamella 10 is heated on the drum-like tensioning element 38 and stretched and fixed in a plastically deformed state. The tensioning element 38 is displaced in the direction of the double arrow 39 towards each other under the action of a suitable tensioning device, so that the planar strip lamella 10 is preliminary during attachment to the building component 12 using the adhesive 16. Can be tensioned. The reinforcing effect is improved if pre-tensioning is maintained until the adhesive cures.

In the embodiment shown in FIG. 5, the planar strip lamella is spirally wound on and attached to the columnar building component 12. For easy winding, the flat strip lamellas can be heated and spiraled easily during winding.

In summary, the present invention relates to a planar strip lamella 10 for reinforcing load bearing or load transfer building materials such as concrete, wood, steel, natural stone or stone structures. This planar strip lamella 10 has a composite structure of a plurality of bendable or stretchable reinforcing fibers 26 and reinforcing fibers arranged in parallel and a bonding matrix 28 that connects to each other to be shear resistant. The lamellas can be attached to the surface of the building material to be reinforced using an adhesive 16. In order to bend the flat strip lamellae over the corner edges of the building materials, the present invention manufactures a bonding matrix 28 composed of a flexible plastic material.

Claims (10)

A composite structure of a plurality of bendable or stretchable reinforcing fibers 26 arranged in parallel and a binder matrix 28 connecting the reinforcing fibers in a shear-resistant manner and reinforced by means of an adhesive 16. In a planar strip lamella for reinforcing a building component 12 that bears or transmits a load, such as concrete that can be attached to an outer surface of the building component 12 to be constructed, it is noted that the binder matrix 28 is composed of thermoplastic resin. Featuring lamellas. The lamella of claim 1, wherein the thermoplastic resin has a glass transition temperature of 100 ° C or higher and a melting point of 160 ° C or higher. The lamella of claim 1 or 2, wherein the thermoplastic resin is selected from polyolefins, vinylpolymers, polyamides, polyesters, polyacetals, polycarbonates, polyurethanes or ionomers. The lamella according to any one of claims 1 to 3, wherein the reinforcing fibers are or comprise carbon fibers. 5. The lamella according to any one of claims 1 to 4, wherein the reinforcing fibers comprise aramid fibers, glass fibers or polypropylene fibers. A method of fastening a prefabricated and longitudinally extending planar strip lamella according to one of the preceding claims over a corner edge (24) to the building component (12), In the intermediate region 30 to be applied over the corners of the building components, the planar strip lamella is heated to a temperature above the glass transition temperature of the thermoplastic binder and bent in a heated state at an angle corresponding to the corner or edge angle of the building components and before cooling. Or later applied to the building component, characterized in that it is fixed to the building component over the edge by means of an adhesive layer (16). A method of securing a prefabricated flat strip lamella according to any one of claims 1 to 5 to a building component surface, wherein the flat strip lamella (10) having a free end is bent or stretched on a tensioning element in a heated state. And the planar strip lamellas (10) are fixed to the building components with the tensioning elements (36) being tensioned with respect to one another and pretensioned. A method of fixing a flat strip lamella according to any one of claims 1 to 5 using an adhesive, wherein a wave or zigzag shape is formed on the free end 34 of the flat strip lamella 10 under the application of pressure and heat and the lamellae. Wherein the wave or zigzag portion is filled with an adhesive while the (34) is inserted into the recess of the building component to form a conforming connection. A method of fixing a planar strip lamella according to any one of claims 1 to 5 using an adhesive, wherein the planar strip lamella heated to a temperature above the glass transition temperature of the binder is spirally wound around the columnar component. Cooling to room temperature in a wound state and at the same time curing the adhesive. 10. Method according to one of the claims 6 to 9, characterized in that the reinforcing fibers (26) are exposed by removing the binder (28) from the side to be connected with the building component.