KR20050089388A - Fiber reinforced plastics hybrid plate having fiber mat and method for reinforcing the structure using such plate - Google Patents

Abstract

The present invention is a FRP hybrid reinforcement plate of a new structure that enhances the strength in the longitudinal direction as well as in the transverse direction by including the fiber mat in the fiber reinforced plastics used for the reinforcement of the structure or as the bottom plate of the structure And it relates to a method for reinforcing concrete structures using the same.

In the present invention, the fiber mat impregnated in the resin 30 and arranged side by side in the longitudinal direction to form an upper layer and a lower layer, and a fiber mat in which the longitudinal and transverse fibers are arranged in a lattice form to form a mat ( 10) is an FRP hybrid reinforcement plate, characterized in that it has a structure that is integrally provided between the upper and lower one-way fiber layer composed of impregnated in the resin 30, and the structure using the reinforcement plate A method of reinforcement is provided.

Description

Fiber Reinforced Plastics Hybrid Plate having Fiber Mat and Method for Reinforcing the Structure using such Plate}

The present invention relates to a fiber-reinforced plastic hybrid reinforcement plate having a fiber mat and a structure reinforcement method using the same. Specifically, Fiber Reinforced Plastics used for reinforcing a structure or as a bottom plate of a structure; The present invention relates to a FRP hybrid reinforcement plate having a new structure having enhanced strength in the longitudinal direction as well as in the transverse direction by including a fibrous mat), and a method of reinforcing concrete structures using the same.

FRP is produced by impregnating a fiber in a resin, has a light weight and high strength, attracting attention as a material that can replace a heavy weight concrete deck. On the other hand, FRP is expanding not only as a material for the bottom plate, but also as a reinforcing material of the existing structure by utilizing its high strength characteristics.

Figure 7c is a schematic diagram for explaining a conventional method for reinforcing a concrete structure using the FRP, as shown in the figure, the wide surface of the conventional FRP reinforcement plate 300 having a predetermined width is concrete structure A method of attaching to the concrete structure 200 using only the resin adhesive 204 such as epoxy to cover the bottom surface of the 200 was a general reinforcing method. When only the adhesive 204 is attached, there is a risk that the FRP reinforcing plate 300, which is a reinforcing material, may fall prematurely.

In addition, such a conventional FRP reinforcement plate 300 has the following disadvantages structurally. FIG. 7A shows a schematic perspective view of a conventional FRP reinforcement plate 300 such that its cross section is visible. In the conventional FRP reinforcement plate 300, one-way fiber 20 included therein is longitudinally oriented. Only are placed side by side. That is, as shown in the figure, the unidirectional fibers 20 are impregnated with a resin such as epoxy in a state where they are arranged side by side to have a plate shape.

Therefore, the conventional FRP reinforcement plate 300 has a considerable tensile strength by the one-way fiber 20 in the longitudinal direction (longitudinal direction) of the one-way fiber 20, but in a direction perpendicular to the longitudinal direction (the transverse direction) ) Has very weak tensile strength. This is because only the resin in the lateral direction exhibits strength, because the resin is brittle and susceptible to tensile force.

Due to this configuration, the conventional FRP reinforcement plate 300 has a long crack in the longitudinal direction even if only a weak tensile or bending stress in the transverse direction, the phenomenon that the FRP reinforcement plate 300 is easily split as shown in Figure 7b Occurs. The splitting of the FRP reinforcement plate 300 due to such longitudinal cracking results in a sudden cross-sectional change of the wide plate, and an uneven stress distribution occurs in the transverse direction, resulting in a partial fracture shape of the FRP. Even in the longitudinal direction, it causes brittle fracture in which the sheet is sharply cut. Such brittle fracture of the board may cause a sudden destruction of the entire structure.

Therefore, due to the phenomenon in which the conventional FRP reinforcement plate splits rapidly in the longitudinal direction, the use of the FRP reinforcement plate is not expanded, and the reinforcement method of the structure using the same is not practically adopted. to be.

The present invention was developed to overcome the structural limitations of the conventional FRP reinforcing plate as described above, specifically, to improve the lateral strength of the FRP reinforcing plate to prevent the FRP reinforcing plate is sharply broken by longitudinal cracking An object of the present invention is to provide a hybrid type FRP reinforcement plate having a new structure. In addition, an object of the present invention is to provide a new reinforcing method for reinforcing a structure in a manner different from the conventional one by utilizing the improved strength characteristics of the FRP reinforcing plate is enhanced in the transverse tensile strength and bending strength as described above. That is, in the conventional FRP reinforcement plate, the fibers are arranged only in the longitudinal direction, it is difficult to fix by the anchor bolt. It is an object of the present invention to provide a hybrid type FRP reinforcement plate capable of fixing by anchor bolts.

In order to achieve this object, in the present invention, as shown in Figure 1, the upper layer and the lower layer, which is formed by impregnating the resin 30 in the state in which fibers 20 are arranged in one direction side by side in the longitudinal direction, the longitudinal direction and The FRP having a structure in which a fiber mat layer formed by impregnating the resin 30 with a fiber mat 10 having a cross-shaped fiber arranged in a lattice shape and being impregnated with the resin 30 is integrally provided between the upper layer and the lower layer. Hybrid reinforcement plate 100 is provided.

Figure 2 is a simplified view showing the continuous manufacturing process of the FRP hybrid reinforcing plate 100 shown in FIG. Referring to Figure 2 will be described in detail the manufacturing method of the FRP hybrid reinforcing plate 100.

The fibrous mat 10 and the one-way fiber 20 are mounted on a holder in roll form, respectively, and the fibrous mat 10 is supplied to the resin 30 in the resin impregnation tank-a (31-a) via the feed guide 12. After being impregnated in, it is supplied to the mold 50 in the resin impregnated fiber mat 11. The unidirectional fibers 20 are impregnated with the resin 30 in the resin impregnation tank-b 31-b via the fiber distributor 22, and then supplied to the mold 50 in the state of the resin impregnated fibers 21. At this time, the resin impregnated one-way fiber 21 supplied to the upper portion of the resin impregnated fiber mat 11 forms the upper surface of the FRP hybrid reinforcing plate 100, and the resin impregnated one direction supplied to the lower portion of the resin impregnated fiber mat 11. The fibers 21 form the bottom surface of the FRP hybrid reinforcement plate 100. As described above, the material disposed in the order of the one-way fiber 20, the fiber mat 10, and the one-way fiber 20 from the top is bitten by the drawer 60 via the mold 50 in the state impregnated with the resin 30. Lose. When the material bitten by the drawer 60 is drawn into the drawer 60 while the mold 50 is heated to a predetermined temperature as described above, the FRP hybrid reinforcement plate 100 is molded and discharged from the mold 50. . The molded FRP hybrid reinforcement plate 100 discharged as described above is cut to the required length in the cutter 70 past the guide roll 62 and stored in the mounting table 80.

Figure 3 shows a preferred embodiment of the resin impregnation tank used in the manufacturing process. The resin impregnation tanks 31-a and 31-b have a heat generating device built therein to maintain the temperature of the resin so that each material, that is, the fiber mat 10 and the one-way fiber 20, can be impregnated appropriately. In addition, the temperature is controlled by the temperature sensor and the temperature controller to maintain the required temperature. Referring to FIG. 3, the resin impregnation tanks 31-a and 31-b are provided with walls having a predetermined space, and electrical resistance wires 37 are embedded in the walls and filled with water 36. As power is supplied to the electrical resistance line 37, the temperature of the filled water 36 may be increased to increase the temperature of the resin. In order to maintain the temperature of the resin 30 contained in the resin impregnation tanks 31-a and 31-b at a constant temperature, the power regulator 39 is connected to the electrical resistance wire 37 according to the temperature sensed by the temperature sensor 38. Adjust the power supply.

The unidirectional fibers 21 impregnated in the resin impregnation tank 31-b are disposed on the upper surface of the resin impregnated fiber mat 11 and simultaneously disposed on the lower surface of the resin impregnated fiber mat 11 to form the mold 50. While passing through, they are fully integrated with each other.

4 illustrates one preferred embodiment of a mold 50. Referring to FIG. 4, an electrical resistance wire 57 is built into the mold 50, and a temperature sensor 58 is also inserted. In order to maintain the temperature of the mold 50 at a constant temperature, the power regulator 59 adjusts the power supplied to the electric resistance line 57 according to the temperature sensed by the temperature sensor 58.

As the unidirectional fibers 20, carbon fibers, glass fibers and aramid fibers are mainly used, and are arranged in one direction along the longitudinal direction of the FRP hybrid reinforcing plate. It can be used in the form of fiber yarn or fiber sheet. As the fiber mat 10, a fiber mat made of carbon fiber, glass fiber, and aramid fiber is used. Kinds of the unidirectional fibers 20 and the fiber mat 10 constituting the FRP hybrid reinforcing plate may be made of different kinds, or may be made of the same kind. Carbon plates made using only the fibers 20 arranged in one direction are easily cracked along the fiber grain direction. This is especially true for wide carbon plates. In the present invention, the fibrous mat 10 is formed of the FRP hybrid reinforcing plate 100 integrated with the unidirectional fiber 20, thereby preventing the uneven distribution of stress in the transverse direction of the FRP, so that such cracking does not occur. In addition, the fiber mat 10 serves to simultaneously bear the load applied to the FRP hybrid reinforcement plate 100 in any direction, and significantly improves the ground pressure during anchorage construction by the anchor, thereby requiring a lot of ground pressure. It is effective for construction.

In addition, an FRP hybrid reinforcing plate manufactured by laminating two or more layers of fiber mat 10 may be provided by the present invention. That is, the unidirectional fiber 20 layer at the center, the fiber mat 10 layer on the unidirectional fiber 20 layer, the unidirectional fiber 20 layer on the fiber mat 10 layer, and the central unidirectional fiber 20 layer. FRP hybrid reinforcing plate composed of a layer of fiber mat 10, a layer of one-way fiber 20 in the lower layer of the lower fiber mat 10 may be provided, by repeating the above configuration to the fiber mat 10 and A FRP hybrid reinforcement plate in which multiple layers of unidirectional fiber 20 are laminated may be provided.

FRP hybrid reinforcement plates may also be provided in which a layer of fibrous mat 10 forms the top and bottom surfaces. That is, the FRP hybrid reinforcement plate may be provided that is composed of a unidirectional fiber 20 layer in the center, a fiber mat 10 layer on the unidirectional fiber 20 layer, and a fiber mat 10 layer below the unidirectional fiber 20 layer. In addition, an FRP hybrid reinforcement plate may be provided in which the fiber mat 10 and the unidirectional fiber 20 layers are laminated by repeating the above configuration, and the fiber mat 10 layer forms an outer surface.

The lower layer is made of a fibrous mat 10 layer, and the upper layer is composed of a unidirectional fiber 20 layer arranged side by side in the longitudinal direction, so that all the fiber 20 layer and the fiber mat 10 layer are impregnated in the resin 30. FRP hybrid reinforcement plate, characterized in that the laminated and heat-hardened after being laminated

The lower layer is composed of a fibrous mat 10 layer, and the upper layer is composed of a unidirectional fiber 20 layer arranged side by side in the longitudinal direction, and the two layers are laminated at least two layers so that the lowermost layer is a fibrous mat 10 layer. And the top layer consists of a unidirectional fiber 20 layer; The FRP hybrid reinforcement plate may be provided by the present invention, in which all of the one-way fiber 20 layer and the fiber mat 10 layer are impregnated with the resin 30 and then laminated by heat curing.

5 and 6 as an embodiment of the structure reinforcement method according to the present invention using the FRP hybrid reinforcement plate 100, using the adhesive and anchor bolt on the outer surface of the concrete structure to be reinforced using the FRP hybrid reinforcement plate 100 A structure arranged horizontally on the outer surface of the structure to reinforce is shown in a schematic perspective view.

After polishing the outer surface of the concrete structure 200 to be reinforced, the anchor hole in accordance with the bolt insertion hole is processed in the lower fixing plate 206 in the concrete portion corresponding to both ends of the FRP hybrid reinforcement plate 100 to be used as a reinforcement ( 201) and the anchor bolt 202 is inserted into the anchor hole 201 and fixed by hitting. After the dust and foreign matter on the polishing surface is removed, the adhesive 204 is applied. The lower fixing plate 206 is brought into close contact with the concrete surface by inserting the bolt insertion hole processed in the lower fixing plate 206 into the anchor bolt 202. Both ends of the anchor bolt 202 is inserted into the FRP hybrid reinforcement plate 100 to be used as a reinforcement. The adhesive 204 is applied to any one surface of the FRP hybrid reinforcement plate 100 formed with the anchor bolt insertion hole. FRP hybrid reinforcement plate 100 is coated with the adhesive is face to face with the adhesive 204 applied to the concrete structure 200 is attached. At this time, the anchor bolt 202 is inserted into the anchor bolt insertion hole which is processed in the FRP hybrid reinforcement plate 100. After the bolt insertion hole processed in the upper fixing plate 205 is fitted to the anchor bolt 202 and closely adhered to the FRP hybrid reinforcing plate 100, the state in which the above process is completed is illustrated in FIG. 5. ), Tighten the nut 203 to the top of the anchor bolt 202 and tighten. (The state in which the above process is completed and construction is completed is shown in FIG. 6).

By using the adhesive 204 and the anchor bolt 202 at the same time as described above to fix the FRP hybrid reinforcement plate 100 of the reinforcement concrete structure 200 and the FRP hybrid reinforcement plate 100 of the reinforcement is integrated behavior Will be

In the case of the conventional FRP reinforcing plate is not reinforced in the transverse direction, when penetrating the reinforcing plate with a fixing anchor, etc., a sudden longitudinal crack is caused, the sharp cross-sectional change of the reinforcing plate occurs due to such a crack Because of the above reinforcement method could not be applied. However, in the present invention, since the FRP hybrid reinforcing plate 100 is provided with the fiber mat 10 and has sufficient strength in the transverse direction, even though it penetrates the anchor for anchoring as described above, longitudinal cracking as in the conventional case is not induced. Therefore, the reinforcement method as proposed above is possible. This is illustrated in FIG. 8. Figure 8a shows that the anchor bolt is installed in the FRP hybrid reinforcement plate of the present invention, except for the one-way fiber layer which is a top layer of the fiber mat for convenience. In the FRP hybrid reinforcing plate of the present invention as shown in Figure 8a, when the tensile load occurs in the T direction in the reinforcing plate, the transverse fibers of the fiber mat 10 is to support the anchor bolt 202. On the other hand, Figure 8b shows that the anchor bolt is installed in the conventional FRP reinforcement plate, as shown in Figure 8b, in the case of the conventional FRP reinforcement plate, anchor bolt 202 when a tensile load occurs in the T direction to the reinforcement plate Can't support it, tears or cracks.

As described above, in the FRP hybrid reinforcing plate 100 of the present invention, since the lattice-like fiber mat 10 in which fibers are disposed not only in the longitudinal direction but also in the transverse direction is integrally provided therein, The stiffness of is increased, and has an excellent effect of preventing brittle fracture due to rapid cracking in the longitudinal direction, which has been pointed out as a problem of the conventional FRP reinforcement plate 300.

In addition, the FRP hybrid reinforcing plate 100 of the present invention has the advantage that can be applied to the reinforcement method installed through the anchor for fixing. In the case of the conventional FRP reinforcement plate, it is intended to integrate with the concrete structure 200 to be reinforced only by the adhesive 204, because it is difficult to use the anchor bolt for fixing. When the anchor bolt is installed in the conventional FRP reinforcement plate, since the fiber 20 is disposed only in one direction in the longitudinal direction, when the load is applied to the FRP reinforcement plate which is the reinforcing material, the anchor bolt portion is torn or split. In contrast, the FRP hybrid reinforcing plate of the present invention supports the load without tearing because the fibers arranged laterally of the fiber mat 10 in the anchor bolt portion support the load. Therefore, by fixing the FRP hybrid reinforcing plate as a reinforcing material using the adhesive 204 and the anchor bolt 202 at the same time, it is possible to ensure more improved integration behavior with the structure to be reinforced, and also the reinforcing material is dropped early to enhance the reinforcing effect It can prevent the loss.

Although the embodiments of the present invention have been described above, the present invention is not limited to the described embodiments, and free modifications and improvements can be made within the spirit and claims of the present invention.

1 shows an example of the FRP hybrid reinforcing plate of the present invention.

Figure 2 is a simplified view showing an embodiment of the manufacturing process of the FRP hybrid reinforcing plate of FIG.

Figure 3 shows an example of the fiber impregnation bath in the manufacturing process of FIG.

Figure 4 shows an example of the mold in the manufacturing process of FIG.

5 is a view showing an embodiment of a reinforcing method for reinforcing a structure using the FRP hybrid reinforcing plate of FIG.

FIG. 6 is a view illustrating a state in which reinforcement of FIG. 6 is completed.

7 is a schematic view showing a conventional FRP reinforcement plate and the appearance that the reinforcement plate is broken.

8 is a view showing an embodiment of a state in which anchor bolts are installed on the FRP hybrid reinforcement plate and the conventional FRP reinforcement plate of the present invention, respectively.

(Explanation of symbols for the main parts of the drawing)

10: fiber mat 11: resin impregnated fiber mat 12: supply guide

20: unidirectional fiber 21: resin impregnated unidirectional fiber 22: fiber distributor

30: resin 31-a, 31-b: resin impregnation tank 32: guide bar

36: water 37: resistance wire 38: temperature sensor

39: power regulator 50: mold 57: electrical resistance wire

58: temperature sensor 59: power regulator 60: drawing machine

62: guide roll 70: cutter 80: loading table

100: FRP hybrid gusset

200: concrete structure 201: anchor hole 202: anchor bolt

203: nut 204: adhesive 205: upper fixing plate

206: lower fixing plate 300: conventional FRP reinforcing plate

Claims (9)

An upper layer and a lower layer made of unidirectional fibers 20 formed by being impregnated with the resin 30 in a state of being disposed side by side in the longitudinal direction, and a fibrous mat 10 in which the longitudinal and transverse fibers are arranged in a lattice form to form a mat. FRP hybrid reinforcing plate, characterized in that the fiber mat layer is impregnated in the resin (30) is integrally provided between the upper layer and the lower layer of the one-way fiber (20), and heat-hardened. The lower layer is a unidirectional fiber 20 layer; Two or more layers composed of a fibrous mat (10) layer on the unidirectional fiber (20) layer and a unidirectional fiber (20) layer on the fibrous mat (10) layer; The final top layer is a unidirectional fiber 20 layer; FRP hybrid reinforcement plate, characterized in that all the one-way fiber (20) layer and the fiber mat (10) layer is impregnated in the resin (30) and then laminated by heat curing. In the state in which the fiber mat layer formed by impregnating the resin mat 30 with the fibrous mat 10 in which the longitudinal and transverse fibers are arranged in a lattice shape and constitutes an upper layer and a lower layer, are arranged side by side in the longitudinal direction. FRP hybrid reinforcement plate, characterized in that the one-way fiber (20) layer impregnated in the resin (30) is integrally provided between the upper layer and the lower layer of the fiber mat (10), and heat-hardened. The lower layer is a fibrous mat 10 layer; Two or more layers comprising a unidirectional fiber (20) layer on the fibrous mat (10) layer and a fibrous mat (10) layer on the unidirectional fiber (20) layer; The final top layer is a fibrous mat 10 layer; FRP hybrid reinforcement plate, characterized in that all the one-way fiber (20) layer and the fiber mat (10) layer is impregnated in the resin (30) and then laminated by heat curing. The lower layer is composed of a fibrous mat 10 layer, and the upper layer is composed of a unidirectional fiber 20 layer disposed side by side in the longitudinal direction; FRP hybrid reinforcement plate, characterized in that all the one-way fiber (20) layer and the fiber mat (10) layer is impregnated in the resin (30) and then laminated by heat curing. The lower layer is composed of a fibrous mat 10 layer, and the upper layer is composed of a unidirectional fiber 20 layer disposed side by side in the longitudinal direction; The two layers are laminated in two or more layers so that the bottom layer becomes a fibrous mat layer 10 and the top layer consists of a unidirectional fiber 20 layer; FRP hybrid reinforcement plate, characterized in that all the one-way fiber (20) layer and the fiber mat (10) layer is impregnated in the resin (30) and then laminated by heat curing. As the unidirectional fibers 20 used in the FRP hybrid reinforcing plate of claim 1; FRP hybrid reinforcement plate manufactured by using carbon fibers, glass fibers, aramid fibers alone or in combination of two or more in the form of fiber yarn or fiber sheet. Fiber mat 10 used in the FRP hybrid reinforcing plate of claim 1; FRP hybrid reinforcement plate manufactured using a fiber mat 10, which is composed of a single or a mixture of two or more carbon fibers, glass fibers, aramid fibers. After polishing the outer surface of the concrete structure 200 to be reinforced, the anchor hole 201 is formed in the concrete portion corresponding to both ends of the FRP hybrid reinforcement plate to be used as the reinforcement, in accordance with the bolt insertion hole processed in the lower fixing plate 206. Processing and fixing by anchoring the anchor bolt 202 into the anchor hole 201; After removing dust and foreign matter from the polishing surface, the adhesive 204 is applied, and the lower fixing plate 206 is concrete so that the bolt insertion hole processed in the lower fixing plate 206 is fitted to the anchor bolt 202. Contacting the surface; After processing the anchor bolt 202 insertion hole in accordance with the anchor hole 201 at both ends of the FRP hybrid reinforcement plate to be used as a reinforcement material, and then apply an adhesive 204 to any one surface of the FRP hybrid reinforcement plate formed with the anchor bolt insertion hole Doing; The adhesive is applied to the FRP hybrid reinforcing plate surface facing the adhesive 204 surface applied to the concrete structure 200 (Anchor bolt 202 to the anchor bolt insertion hole is processed in the FRP hybrid reinforcement plate) To be inserted); The bolt fixing hole processed in the upper fixing plate 205 is fitted to the anchor bolt 202 so that the upper fixing plate 205 is brought into close contact with the FRP hybrid reinforcing plate, and then the nut 203 is placed on the upper end of the anchor bolt 202. Fastening and tightening); A construction method for reinforcing concrete structures using the FRP hybrid reinforcing plate of claim 1, including.