KR101013502B1 - Method for manufacturing a structure reinforcing member using aramid strip and the structure reinforcing member using aramid strip manufactured according thereto - Google Patents

Abstract

The present invention relates to a method for producing aramid strip structural reinforcement and aramid strip structural reinforcement prepared according to the above, the method comprises the steps of allowing the resin to penetrate by enclosing a plurality of steel wire in a plurality of aramid fibers in the resin bath; Passing the steel wire and the aramid fiber through a guide plate to form a plate-shaped steel wire embedded aramid fiber layer; Drawing the wire-filled aramid strip by inserting the wire-filled aramid fiber layer, the adhesive peel ply, and the anti-degradation film into a drawing die; And a cutting step of cutting the steel wire-embedded aramid strip integrated into a plate shape into a bar shape having a length suitable for construction. The aramid strip structural reinforcement manufactured according to the above configuration is embedded in the aramid fiber layer. By increasing the ductility of the ultimate load by the PC steel wire it is possible to improve the seismic resistance to the structure, etc., it is possible to prevent deterioration of the aramid fiber layer by the deterioration prevention film attached to the outside.

Aramid, Strip, Structural Reinforcement, Steel Wire, Peel Ply, Anti-Degradation Film

Description

Method for manufacturing a structure reinforcing member using aramid strip and the structure reinforcing member using aramid strip manufactured according according

The present invention relates to a method for producing aramid strip structural reinforcement and aramid strip structural reinforcement prepared according to the present invention, and more specifically, the adhesive peeling on both sides of the steel wire embedded aramid strip composed of several strands of aramid fibers and a plurality of high-strength PC steel wire The present invention relates to a method for producing an aramid strip structural reinforcing material in which a ply-ply and a deterioration preventing film are pressed and integrated, respectively, and an aramid strip structural reinforcing material manufactured accordingly.

The method of structural reinforcement of an existing building or facility should not impose great restrictions on the usability of the existing building and should be economical, and therefore, there is a limitation in the structural reinforcement. Until now, the method of reinforcing the strength of a member using an iron plate has been the most applied method to structural reinforcement. However, the method of structural reinforcement using the iron plate has a problem that the construction is difficult because the load of the iron plate itself in the member is large, and measures against corrosion of the iron plate are necessary.

Fiber reinforcement methods have been developed to compensate for these drawbacks. Examples of the fiber reinforcing material include carbon fiber, aramid fiber, glass fiber, high strength high elastic polyesterylene fiber, vinylon fiber, polypropylene fiber and acrylic fiber. Although these fibers have a small specific gravity compared to steel materials, they have a high tensile strength and excellent corrosion resistance, thereby achieving high durability against rationalization, efficiency, and salting of concrete structures.

As described above, a new technology has been developed that solves the problems of existing methods and satisfies both safety and economical efficiency. Therefore, the general fact that the reinforcement coating method is advantageous to the cross section expansion method and the material properties, workability and durability in the reinforcement coating method A technique has been developed that focuses on the fact that the FRP bonding method using an easy-to- secure composite material may have more strength.

However, while FRP reinforcement has a high breaking strength, there is almost no elongation after fracture of the reinforcement, resulting in rapid brittle fracture. Especially carbon fiber can cause very serious brittle fracture. In order to make up for the failure, the post tension tension material is added to the outside of the FRP reinforcement. However, the construction process is complicated, the construction cost increases, and the appearance is unsatisfactory, so it has to be covered by a separate finishing material.

The present invention has been proposed to solve the problems of the conventional FRP seismic reinforcement as described above, while developing a structural reinforcement and seismic reinforcement using aramid fibers, unlike the existing aramid sheet and rod-shaped aramid rod plate At the same time, it is intended to develop structural reinforcement materials that can improve the ductility that has been a problem in high-strength fibers by high-strength PC steel wire and prevent deterioration caused when aramid fibers are exposed to the outside for a long time. The purpose is.

In order to achieve the above object, the resin accommodated in the resin bath as a gap between the steel wire and the aramid fibers by putting a plurality of steel wires spaced at regular intervals wrapped in a plurality of aramid fibers to the resin bath. Resin impregnation step to be penetrated; A steel wire-embedded aramid fiber layer forming step of forming a plate-shaped steel wire-embedded aramid fiber layer by being pressed while passing the steel wire and the aramid fiber impregnated with the resin in the resin impregnation step between the guide plates; The steel wire embedded aramid fiber layer, the adhesive peel ply, and the anti-deterioration film for attaching the adhesive peel ply and the anti-degradation film on one side and the other side of the steel wire embedded aramid fiber layer integrated in the plate-shaped aramid fiber layer forming step A strip drawing step of drawing a wire into a draw die to form a steel wire embedded aramid strip; And a cutting step of cutting the steel wire embedded aramid strip integrated into a plate shape in the strip drawing step into a bar shape having a length suitable for construction.

In addition, the present invention is a plurality of steel wire which is arranged at a predetermined interval in the transverse direction extending along the axis; A plate-shaped aramid fiber layer made of a resin impregnated with a plurality of aramid fibers and the gap therebetween while extending along the plurality of steel wires; An adhesive peel ply composed of a nonwoven fabric and an adhesive bonded to one side of the steel wire embedded aramid fiber layer in which the steel wire is embedded in the aramid fiber layer; And a deterioration prevention film pressed against the other side of the steel wire embedded aramid fiber layer to prevent deterioration.

Therefore, according to the method for producing aramid strip structural reinforcement of the present invention and the aramid strip structural reinforcement prepared according to the present invention, as can be seen from FIG. 6 showing the relationship between tensile stress and strain of PC steel wire and high strength fiber, Since the stress and strain of all fibers are in a straight line until fracture and do not exhibit the same yielding effect as rebar, various fibers are suddenly broken after fracture, but have several times higher tensile strength than rebar. As can be seen, when the PC steel wire is integrally embedded in the aramid strip as in the present invention, it is possible to improve the ductility of the reinforcing material at the extreme load, it is possible to significantly improve the reinforcement performance, such as shock resistance to the structure.

In addition, according to the structural reinforcing material of the present invention, it is excellent in workability and can be constructed even in a narrow space, there is almost no work requiring skill, and since it is an organic fiber, it is easy to impregnate the resin. And the efficiency can be greatly increased.

In addition, when the PC steel wire is used as a steel wire embedded in the structural reinforcement, it has a tensile strength of up to 5 times that of the steel, so the reinforcement amount is small and does not change the shape of the structure after the reinforcement is completed. As light as / 5, there is no increase in weight even after reinforcement, which not only affects the foundation of the structure, but also is sufficiently stable against corrosion, resulting in improved performance against fatigue.

In addition, when constructing the structural reinforcement of the present invention, when peeling the non-woven fabric of the peel ply attached to one side of the structural reinforcement from which the non-woven fabric is separated, while the adhesive component remains, the adhesion to the surface of the structure is improved, the adhesive component Since the foreign matter does not adhere to the remaining adhesive surface, it is possible to dramatically improve the adhesion of the structural reinforcing material bonded to the structure as if the adhesive is applied to the clean surface.

In addition, by attaching a deterioration prevention film on the opposite side to which the peel ply is attached, it is possible to prevent deterioration of aramid fibers due to long-term external exposure, thereby improving overall durability, so that no deterioration prevention paint work or other finishing is required. Therefore, the construction period can be shortened and the cost can be reduced.

Hereinafter, the aramid strip structure reinforcing material according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The aramid strip structural reinforcement of the present invention, as shown in Figure 1, a plurality of steel wire 10, aramid fiber layer 20, the adhesive peel ply 50, and the anti-deterioration film (60).

Here, the plurality of steel wires 10 are arranged at intervals in the transverse direction in the inside of the plate-shaped aramid fiber layer 20, as shown in Figures 1 and 4 extend along the axis. As a material of the steel wire 10, a high strength PC steel wire is preferable. The high strength PC steel wire 10 is slightly lower than the aramid fiber 15, but has a high strength, and has excellent ductility in the action of extreme loads. It has the net function of converting brittle fracture into soft fracture.

Therefore, when the aramid fibers 15 and the high-strength PC steel wire 10 are used at the same time, not only can the structure reinforcement by the aramid strip structural reinforcing material 1 can be effectively effective, but also deformed by the ductility of the PC steel wire 10. As the energy absorption capacity of the city is improved, it has excellent performance as a seismic reinforcing material.

The aramid fiber layer 20 is composed of a plurality of strands of aramid fiber 15, as shown in Figure 3, the aramid fiber 15, although the specific gravity is small compared to the steel material has a high tensile strength, and corrosion resistance It is also excellent in rationalization, efficiency and salt resistance of concrete structures, and it is possible to achieve high durability, as well as excellent water resistance, weather resistance, chemical resistance, abrasion resistance, and electrical insulation, bulletproof width, fire fighting suit, spacecraft, airplane It has been used in various fields such as fuselage, transformer insulators, automobile brakes and automobile tires. In particular, the elongation is 2 to 5%, the ductility is better than the carbon fiber, the elastic modulus is only 2/3 to 1/3 of the steel, there is no conductivity and is a suitable material for structural reinforcement. In addition, aramid fiber is not only light, but also has ductility necessary for seismic performance and easy construction, so it has excellent physical properties as a seismic reinforcing material.

Accordingly, the aramid fiber layer 20 made of such aramid fibers 15 is impregnated with a resin such as a urethane resin with a plurality of steel wires 10 wrapped around the guide plate 45, as shown in FIG. After passing through, the steel wire is integrated into the aramid fiber layer 40, and then, in the subsequent process, it is introduced into the drawing die 80 together with the adhesive peel ply 50 and the anti-deterioration film 60 to be drawn and crimped into the steel wire embedding aramid strip 70. do.

Meanwhile, as shown in FIGS. 1 and 5, the adhesive peel ply 50 is attached to the structure to reinforce the steel wire embedded aramid fiber layer 40 in which the steel wire 10 is embedded in the plate-shaped aramid fiber layer 20. As a means for imparting adhesion to the steel wire embedded aramid fiber layer 40, for example, the outer nonwoven fabric 51 made of a polyester fabric or the like, and the adhesive 53 inside the nonwoven fabric 51 It is made, and is pressed by the drawing die 80 as shown in Figure 3 on one side 41 of the steel wire embedded aramid fiber layer (40). When the aramid strip structural reinforcing material (1) is installed on-site, the nonwoven fabric 51 is detached to generate irregularities on the surface of the steel wire-embedded aramid fiber layer 40 to which the nonwoven fabric 51 is attached, thereby adhering the aramid to the structure together with the adhesive 53. It serves to significantly increase the adhesion of the strip structure reinforcing material (1).

As shown in FIGS. 1 and 5, the anti-deterioration film 60 is pressed out on the other side 43 of the steel wire embedded aramid fiber layer 40 to the outside of the aramid strip structural reinforcement 1 attached to the structure to be reinforced. As a means of preventing the exposed exposed surface from being deteriorated, it is pressed by the drawing die 80 to the other side 43 of the steel wire-embedded aramid fiber layer 40, and the aramid strip structural reinforcement 1 is constructed as shown in FIG. After construction in the aramid strip structure reinforcement (1) it is possible to prevent the surface degradation of the aramid fiber layer 20 without applying a separate anti-deterioration paint on the surface.

It describes a method for producing an aramid strip structure reinforcing material according to a preferred embodiment of the present invention configured as described above.

As shown in Figure 2, the aramid strip structure reinforcing method of the present invention, the resin impregnation step (S10), steel wire embedded aramid fiber layer forming step (S20), strip drawing step (S30), and cutting step (S40) As one drawing method made, first, in the resin impregnation step (S10), as shown in Figures 3 and 4, arranged a plurality of steel wires 10 spaced apart at regular intervals to extend in the longitudinal direction, each steel wire A plurality of steel wires 10 and aramid in a resin such as, for example, a urethane resin contained in the resin bath 30 is put into the resin bath 30 in a state in which one or more strands of aramid fibers 15 are wound thereon to surround 10 The fiber 15 is impregnated.

Next, in the steel wire embedded aramid fiber layer forming step (S20), as shown in FIGS. 3 and 5, the plurality of steel wires 11 and aramid fibers (15) impregnated with a resin through the resin impregnation step (S20). ) Is passed through the guide plate 45 to be pressed in a plate shape in accordance with the interval of the guide plate 45 to form a steel wire embedded aramid fiber layer 40.

Then, in the strip drawing step (S30), the adhesive fill ply 50 is formed on one side 41 of the steel wire embedded aramid fiber layer 40 integrated in a plate shape in the steel wire embedded aramid fiber layer forming step (S20). As shown in FIG. 3, the adhesive peel ply 50 and the anti-degradation film 60 are stacked on both sides of the steel wire-embedded aramid fiber layer 40 so as to attach the anti-deterioration film 60 to the 43. 80), the steel wire-embedded aramid strip 70 is formed by drawing.

Finally, in the cutting step (S50), as shown in Figure 3, in the drawing step (S40) in the construction of the structure to be reinforced by the cutter 90 the steel wire-buried aramid strip 70 integrated into a plate shape By cutting to have a suitable length, a bar-shaped aramid strip structural reinforcement 1 is obtained.

1 is a cross-sectional view of the aramid strip structural reinforcement according to the present invention.

Figure 2 is a block diagram sequentially showing a method for producing aramid strip structural reinforcement according to the present invention.

3 is a view schematically showing a method for manufacturing the aramid strip structural reinforcement shown in FIG.

4 is a cross-sectional perspective view schematically showing a steel wire embedded aramid fiber layer in which a steel wire is embedded in the aramid fiber layer.

FIG. 5 is a cross-sectional perspective view schematically illustrating a state in which an adhesive peel ply and a degradation prevention film are respectively attached to both sides of the steel wire embedded aramid fiber layer of FIG. 4; FIG.

Figure 6 is a graph showing the relationship between the strain and the tensile stress of the various fibers.

Description of the Related Art

1: Aramid strip structural reinforcement 10: Steel wire

15: aramid fiber 20: aramid fiber layer

30: resin bath 40: steel wire embedded aramid fiber layer

50: adhesive peel ply 60: deterioration prevention film

70: steel wire purchase aramid strip 80: inbalddai

90: cutter

Claims (6)

The plurality of steel wires 10 spaced apart at intervals are wrapped in a plurality of aramid fibers 15 and introduced into the resin bath 30 so that the gap between the steel wires 10 and the aramid fibers 15 is increased. Resin impregnation step (S10) to allow the resin accommodated in the resin bath 30 to penetrate; Steel wire embedded aramid to form a plate-shaped steel wire embedded aramid fiber layer 40 by being pressed while passing the steel wire 10 and the aramid fiber 15 impregnated with a resin in the resin impregnating step (S10) between the guide plate 45. Fiber layer forming step (S20); An adhesive peel ply 50 and a deterioration prevention film 60 on one side 41 and the other side 43 of the steel wire embedded aramid fiber layer 40 integrated in a plate shape in the steel wire embedded aramid fiber layer forming step (S20). The steel wire embedded aramid fiber layer 40, the adhesive peel ply 50, and the anti-deterioration film 60 are introduced into the drawing die 80 so as to attach the respective wire-filled aramid fiber layers 40 to form the steel wire embedded aramid strip 70. Strip drawing step (S30) to; And Aramid strip structural reinforcement manufacturing method comprising a; cutting step (S50) for cutting the steel wire-buried aramid strip 70 integrated into a plate shape in the strip drawing step (S30) in the form of a bar suitable for construction . The method of claim 1, The steel wire 10 is aramid strip structural reinforcement manufacturing method, characterized in that the PC steel wire. The method according to claim 1 or 2, The resin contained in the resin bath 30 is a method for producing aramid strip structure reinforcement, characterized in that the urethane resin. A plurality of steel wires 10 arranged laterally at intervals and extending along an axis; A plate-shaped aramid fiber layer 20 made of a resin impregnated with a plurality of aramid fibers 15 and a gap therebetween while extending along the plurality of steel wires 10 and surrounding the steel wire 10; Adhesion made of a nonwoven fabric 51 and an adhesive 53, which is provided in a state in which the steel wire 10 is embedded in the aramid fiber layer 20 in a state where the steel wire embedded in the aramid fiber layer 40 is pressed into one side 41 of the aramid fiber layer 20. Fill ply 50; And Aramid strip structure reinforcement, characterized in that consisting of; a deterioration prevention film (60) provided in a crimped state to prevent deterioration on the other side (43) of the steel wire embedded aramid fiber layer (40). The method of claim 4, wherein The steel wire 10 is aramid strip structure reinforcement, characterized in that the PC steel wire. The method according to claim 4 or 5, Aramid strip structure reinforcing material, characterized in that the resin impregnated with the gap between the aramid fibers 15 of the plate-shaped aramid fiber layer 20 is urethane resin.

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