WO2003064789A1

WO2003064789A1 - Reinforcing device

Info

Publication number: WO2003064789A1
Application number: PCT/EP2002/014304
Authority: WO
Inventors: Alexander Bleibler; Reto Clénin
Original assignee: Sika Schweiz Ag
Priority date: 2002-01-29
Filing date: 2002-12-16
Publication date: 2003-08-07
Also published as: RU2004126221A; ATE367494T1; BR0215545A; DE50210529D1; JP2005516136A; EP1481139A1; EP1481139B1; US20050155303A1; KR20040078670A; CN1671932A; CO5601050A2; MXPA04006750A; CA2474170A1; EP1331327A1

Abstract

The invention relates to a reinforcing device for supporting structures, that comprises a lamellar structure that runs into an anchoring device. Said lamellar structure is composed of a plurality of separate or separable individual layers between which intermediate layers are disposed at least in the zone of the anchoring device. The invention also relates to a method for producing such a reinforcing device and to a method for the reconstruction and/or reinforcement of edifices on the basis of such a reinforcing device. Preferably the lamellar structure is provided with carbon-fiber reinforced plastic lamellae (CFK) as the individual layers which are imbedded in a thermoplastic matrix. Preferably the individual layers of the lamellar structure are based on a thermoplastic conventional plastic material and additionally have interposed fabric inserts of metal plates as the intermediate layers, most preferably a bidirectionally oriented fabric, especially a bidirectionally oriented aramide fiber fabric.

Description

VERSTARKUNSVORRICHTUNG

Technical field

The invention relates to a reinforcement device for support structures, which has a lamella structure which opens into an anchoring device, characterized in that the lamella structure consists of a plurality of separate or separable individual layers, between which insert layers are arranged. In addition, methods for producing such a reinforcement device and methods for renovating and / or reinforcing structures on the basis of such a reinforcement device are provided.

State of the art

The international patent application PCT / CH98 / 00346 (published as WO99 / 10613) discloses a generic reinforcement device. There, the ends of CFRP lamellas intended for reinforcing supporting elements, such as concrete beams, are separated into at least two flags of approximately the same thickness and glued into corresponding holding slots, each arranged at an angle to one another, of a terminating element. This arrangement is now glued onto the tension side of the support element, the CFRP lamella preferably being prestressed directly over the end elements relative to the support element. The terminating element can be inserted into a corresponding recess in the supporting element or glued and / or dowelled directly onto the surface of the supporting element, if necessary using a transverse clamping device. Particularly in the area of the opening of such a reinforcement device into the anchoring device, however, as a result of the sudden change in cross-section, there are regularly considerable transverse forces acting transversely to the main axis of the reinforcement device and finally can increasingly impair their strength up to the point of breaking the entire device.

To protect against this problem, a suitable transverse tensioning device is therefore often provided in the region of the opening of such a reinforcement device into the anchoring device. However, this in turn is naturally prone to failure and difficult and also makes the entire construction considerably more expensive. Furthermore, the reinforcement device is often stressed in the direction of the main axis up to the load limit and beyond, so that a break in the load-bearing fastening of the lamellar structure can occur in the region of the anchoring device.

Presentation of the invention

It is therefore an object of the present invention to overcome the disadvantages of the existing state of the art and to provide a reinforcement device which is unbreakable and resilient both in the region of the mouth into the anchoring device and at the same time a maximum load on the main load-bearing anchor in the direction easily withstands the main axis.

This object is achieved with the aid of a reinforcement device according to the invention. According to the features of claim 1, the reinforcement device for support structures according to the present invention has a lamellar structure which is divided into a Anchoring device opens, characterized in that the lamella structure consists of a plurality of separate or separable individual layers, between which insert layers are arranged at least in partial areas, preferably in the area of the anchoring device. In addition, methods for producing such a reinforcement device and methods for renovating and / or reinforcing structures on the basis of such a reinforcement device are provided. The lamellar structure preferably has carbon fiber-reinforced plastic lamellas (CFRP) as individual layers, which are embedded in a thermoplastic matrix. The individual layers of the lamellar structure are preferably based on a thermoplastic commercial plastic and, as insert layers, preferably additionally have fabric inserts or metal plates arranged between them, particularly preferably a bidirectionally oriented fabric, in particular a bidirectionally oriented aramid fiber fabric.

The invention relates to a reinforcement device for supporting structures, which has a lamellar structure which opens into an anchoring device, characterized in that the lamellar structure consists of a plurality of separate or separable individual layers, between which insert layers are arranged. In addition, methods for producing such a reinforcement device and methods for renovating and / or reinforcing structures on the basis of such a reinforcement device are provided. The lamella structure preferably has, as individual layers, carbon fiber-reinforced plastic lamellae (CFRP) which are embedded in a thermoplastic matrix. The individual layers of the lamellar structure are preferably based on a thermoplastic commercial plastic and, as insert layers, preferably additionally have fabric inserts or metal plates arranged in between, and particularly preferably a bidirectionally oriented fabric, in particular a bidirectionally oriented aramid fiber fabric. Way of carrying out the invention

The present invention relates to a reinforcement device for support structures, which has a lamella structure which opens into an anchoring device, characterized in that the lamella structure consists of a plurality of separate or separable individual layers, between which insert layers are arranged. In such a reinforcement device, both ends of the lamellar structure preferably open into an anchoring device. According to a preferred embodiment, such a reinforcement device has a lamellar structure which has carbon fiber-reinforced plastic lamellas (CFRP) as individual layers. According to a preferred embodiment, the individual layers of the reinforcement device are embedded in a thermoplastic matrix. According to a preferred embodiment, the individual layers of the lamella structure of such a reinforcement device are based on a thermoplastic consumer plastic. According to a further preferred embodiment of the reinforcement device, fabric inserts or metal plates are additionally arranged as insert layers between the individual layers of the lamella structure, a bidirectionally oriented fabric preferably being arranged as the insert layer, in particular a bidirectionally oriented aramid fiber fabric. According to a preferred embodiment of the reinforcement device, the anchoring device is a plurality, preferably two, of hollow body segments connected to a hollow body which spatially surrounds the slat end. These hollow body segments can be connected, preferably screwed, with the aid of cylindrical bores that run through the entire lamella thickness. The use of a thermoplastic material has the additional, considerable advantage that a heated instrument can be used to create very targeted and carefully positioned openings in the material, so that the embedded carbon fibers can avoid the instrument and therefore in no way through the hole be damaged, which is correspondingly advantageous affects the stability and thus in particular the axial strength of the entire reinforcement device.

In an alternative embodiment, such an anchoring device is at least one axially adjustable cylinder, particularly preferably at least one axially rotatably mounted cylinder made of steel or in particular fiber-reinforced plastic, which can be provided with an adjusting screw. According to a preferred embodiment, the anchoring device is a clamping head, which can preferably be adjusted and locked using an axially guided threaded rod.

In addition, the present invention relates to a method for producing a reinforcement device described above, which is characterized in that it has the following steps (a) to (d):

(a) splicing conventional lamellae into a plurality of individual layers in a manner known per se;

(b) inserting a plurality of interlayers between the individual layers produced according to (a); (c) fusing the lamellar structure into a sandwich-like package, preferably by exposure to heat and / or pressure; (d) Attaching the anchoring device, preferably using a suitable clamping device.

According to a further embodiment, a method according to the invention is characterized in that it has the following steps (a) to (c):

(a) combining a plurality of customary individual layers of a customary lamella structure with a plurality of insert layers to form a lamella structure which is preferably arranged alternately, in a manner known per se; (b) fusing the lamellar structure into a sandwich-like package, preferably by exposure to heat and / or pressure;

(c) Attaching the anchoring device, preferably using a suitable clamping device.

A preferred embodiment of such a method is characterized in that the method additionally has a step in which the cross section of the lamella structure is increased in the area of the connection to the anchoring device, in that additional individual layers and / or insert layers are preferably applied alternately to the lamella structure.

Another preferred embodiment of such a method is characterized in that both ends of the lamellar structure open into an anchoring device.

Another preferred embodiment of such a method is characterized in that the lamella structure has carbon fiber reinforced plastic lamellae (CFRP) as individual layers.

Another preferred embodiment of such a method is characterized in that the individual layers of the lamella structure are embedded in a thermoplastic matrix.

Another preferred embodiment of such a method is characterized in that the individual layers of the lamella structure are based on a thermoplastic consumer plastic.

A further, preferred embodiment of such a method is characterized in that additional fabric inlays or metal plates are arranged between the individual layers of the lamella structure as inlay layers, preferably a bidirectionally oriented fabric, in particular a bidirectionally oriented aramid fiber fabric. A further preferred embodiment of such a method is characterized in that the anchoring device is a plurality, preferably two, of hollow body segments connected to a hollow body which spatially surrounds the slat end.

Another preferred embodiment of such a method is characterized in that the anchoring device is at least one axially adjustable cylinder, preferably at least one axially rotatably mounted steel cylinder with an adjusting screw.

A further, preferred embodiment of such a method is characterized in that the anchoring device is a clamping head, which can preferably be adjusted and locked with the aid of an axially guided threaded rod.

In addition, the present invention also relates to a method for reinforcing and / or renovating buildings, which is characterized in that, in the context of this method, at least one of the load-bearing structural elements of this building is equipped with a reinforcing device described above.

Finally, the present invention relates to the use of a reinforcement device as described above for the reinforcement and / or renovation of structures, preferably load-bearing construction elements based on concrete, in particular for the reinforcement of bridge structures.

In the following text section, preferred embodiments of the present invention are described in more detail with reference to the typical exemplary embodiments disclosed in FIGS. 1 to 3: embodiments

FIG. 1 shows an example of a reinforcement device according to the invention and at the same time illustrates the production method, a longitudinal sectional view being shown in the upper area of the figure and a cross-sectional view being shown below. This embodiment of the reinforcement device can preferably be produced as follows in accordance with process steps 1 to 5 (metal plates can also be used instead of the fabric inserts (1)):

1.Divide the slats in the thickness to enlarge the surface (in e.g. 2-7 parts): a) Splicing of commercially available slats:

• For example, the slat can be cut into the desired number of slats using a heated cutting tool (e.g. knife, hot wire)

Thickness can be divided. This process is more gentle on the fibers than the already known process of splicing thermoset fins (see disclosure of WO 00/50706).

• The fibers of the slat ends can be exposed from the matrix by heating. The fibers can then be laid out in the desired shape and fused in a clamping head.

b) An alternative manufacturing method works as follows:

• A lamella is composed of several thin layers (so-called tapes). These individual thin tapes are under heat and

Pressure pressed together into a single lamella. Inserting release films in the manufacturing process in the anchoring areas (no bonding of the individual tapes in the desired areas).

• First manufacture the anchoring head from the tapes, only then weld the tapes along the free length into a lamella.

• The lamella, preferably over its entire thickness, is provided with bidirectional tissue between the tapes (see step 2.). 2. Insert bidirectional fabric (preferably aramid fabric with an orientation of +/- 45 °) with a thermoplastic matrix. A tissue is placed in every 1st separating layer.

3. In addition, the cross-section in the anchoring area can be enlarged if necessary by alternately gluing a fabric and a thin (approx. 0.2mm) thick slat tape on the outside.

4. The sandwich-like lamellar structure thus obtained is fused into a package under the action of heat and pressure. This process may have to be carried out in several stages (per individual shift).

5. In the transition between lamella and head, transverse tensile forces can arise as a result of the change in cross-section. These can preferably be made using a suitable device (e.g. steel / or carbon fiber profile)

Can be clamped together using screws (3).

FIG. 2 shows possible further variants of the end anchoring of a reinforcement device according to the invention in the anchoring device, a longitudinal sectional view being shown in the left figure area and a cross sectional view being shown in the right figure area.

Literature EP 1 000 208 B1 (= WO 99/06651) discloses the generic embodiment of the zigzag shape of the slat end shown in FIG. 2. According to a preferred embodiment of the invention, the zigzag-shaped slat end is additionally bent in such a way that a tension-adapted bending radius is realized in the anchoring device due to the variation of the slat radii, which additionally increases the risk of “predetermined breaking points” in the mouth area of the anchoring device discussed above reduced.) Possible manufacturing methods for this preferred embodiment of the invention can be described as follows, wherein the anchoring parts can be made of a common plastic or metal:

1.Zig-zag shape: a) First, the zig-zag shape of the slat end piece is produced (e.g. by heating and pressing in a suitable shape), followed by subsequent fitting into a suitable positive and negative shape.

b) Pressing the end into a heated positive-negative mold, which brings the lamella into the desired zigzag shape. This shape is then left as an anchoring part on the slat.

2. Attach the mold to the zigzag fin end piece:

The form of sheathing (made from a common plastic or metal) can be glued (B1), screwed (B2), or tied over the entire surface (B3, e.g. with aramid, glass, or preferably carbon fibers).

According to a further preferred embodiment, the anchoring device of a reinforcement device as described above can be based on a steel cylinder, as shown schematically in FIG. 3 (a longitudinal sectional view is shown in the upper area and a top view is shown below).

Possible manufacturing methods for this preferred embodiment of the invention can be described as follows

1. In order for the lamella to be wound to such a small radius, it must be split (or have been split). This can be done analogously to the embodiment according to FIG. 1 (division of the lamella thickness to enlarge the surface) (see above). 2. Winding up the lamella structure on a cylinder made of steel or preferably fiber-reinforced plastic. The various individual layers of the lamellar structure can be guided through a slot for fastening or held mechanically (using cross bolts and screws). The tension is reduced by the static friction between the cylinder and the CFRP plate. The surface of the cylinder should therefore preferably be chosen as rough as possible.

3. Warming the head creates a compact component.

According to a further preferred embodiment, it is also possible to wrap each individual layer of the lamella structure around a cylinder made of steel or preferably fiber-reinforced plastic and thus to construct the anchoring device on the basis of several cylinders.

Claims

claims

1. Reinforcement device for support structures, comprising a lamella structure which opens into an anchoring device, characterized in that the lamella structure consists of a plurality of separate or separable individual layers, between which insert layers are arranged at least in the region of the anchoring device.

2. Reinforcement device according to claim 1, characterized in that in each case both ends of the lamella structure open into an anchoring device.

3. Reinforcement device according to one of claims 1 or 2, characterized in that the lamella structure as individual layers

Has carbon fiber reinforced plastic fins (CFRP).

4. Reinforcement device according to one of claims 1 to 3, characterized in that the individual layers of the lamella structure are embedded in a thermoplastic matrix.

5. Reinforcement device according to one of the preceding claims, characterized in that the individual layers of the lamellar structure are based on a thermoplastic consumer plastic.

6. Reinforcement device according to one of the preceding claims, characterized in that between the individual layers of the lamellar structure as insert layers, additional fabric inserts or metal plates are arranged, preferably a bidirectionally oriented fabric, in particular a bidirectionally oriented aramid fiber fabric.

7. Reinforcement device according to one of the preceding claims, characterized in that it is the anchoring device a plurality, preferably two, of hollow body segments connected to form a hollow body which spatially surrounds the lamella end, which have optionally been connected, preferably screwed, with the aid of cylindrical bores through the entire lamella thickness.

8. Reinforcement device according to one of the preceding claims, characterized in that the anchoring device is at least one axially adjustable cylinder, preferably at least one axially rotatably mounted cylinder made of steel or particularly preferably fiber-reinforced plastic, which is optionally provided with an adjusting screw.

9. Reinforcement device according to one of the preceding claims, characterized in that the anchoring device is a clamping head, which is preferably adjustable and lockable with the aid of an axially guided threaded rod.

10. A method for producing a reinforcement device according to one of the preceding claims, characterized in that the method comprises the following steps:

11. A method for producing a reinforcement device according to one of claims 1 to 9, characterized in that the method comprises the following steps: (a) combination of a plurality of customary individual layers of a customary lamella structure with a plurality of insert layers to form a lamella structure which is preferably arranged alternately, in a manner known per se; (b) fusing the lamellar structure into a sandwich-like package, preferably by exposure to heat and / or pressure; (c) Attaching the anchoring device, preferably using a suitable clamping device.

12. The method for producing a reinforcement device according to one of claims 10 or 11, characterized in that the method additionally comprises a step in which the cross section of the lamella structure in the area of the connection to the anchoring device is increased by additional individual layers and / or insert layers are preferably applied alternately to the lamella structure.

13. The method according to any one of claims 10 to 12, characterized in that in each case both ends of the lamella structure open into an anchoring device.

14. The method according to any one of claims 10 to 13, characterized in that the lamella structure has carbon fiber reinforced plastic lamellae (CFRP) as individual layers.

15. The method according to any one of claims 10 to 14, characterized in that the individual layers of the lamella structure are embedded in a thermoplastic matrix.

16. The method according to any one of claims 10 to 15, characterized in that the individual layers of the lamella structure are based on a thermoplastic consumer plastic.

17. The method according to any one of claims 10 to 16, characterized in that between the individual layers of the lamellar structure additional fabric inlays or metal plates are arranged as inlay layers, preferably a bidirectionally oriented fabric, in particular a bidirectionally oriented aramid fiber fabric.

18. The method according to any one of claims 10 to 17, characterized in that the anchoring device is a plurality, preferably two, of hollow body segments connected to a hollow body which spatially surrounds the slat end.

19. The method according to any one of claims 10 to 18, characterized in that the anchoring device is at least one axially adjustable cylinder, preferably at least one axially rotatably mounted cylinder made of steel or particularly preferably fiber-reinforced plastic, which is optionally provided with an adjusting screw ,

20. The method according to any one of claims 10 to 19, characterized in that the anchoring device is a clamping head, which is preferably adjustable and lockable with the aid of an axially guided threaded rod.

21. A method for reinforcing and / or renovating buildings, characterized in that in the context of this method, at least one of the load-bearing structural elements of this building is equipped with a reinforcing device according to one of claims 1 to 9.

22. Use of a reinforcement device according to one of claims 1 to 9 for the reinforcement and / or renovation of buildings, preferably load-bearing construction elements based on concrete, in particular bridge constructions.