KR100624761B1 - Device and Method for Reinforcing Concrete Structure - Google Patents

Abstract

The present invention provides a new structure for reinforcing concrete structures using FRP hybrid reinforcing materials or steels having a new structure that increases strength in longitudinal as well as transverse directions by including fiber mat in Fiber Reinforced Plastics (FRP). It relates to a reinforcing member of the form and a reinforcing method using the same.

In the present invention, as a reinforcing member attached to the concrete structure to reinforce the concrete structure, the reinforcing member 1 is a flat horizontal portion 11, a vertical portion 12 protruding at a predetermined height in the center of the horizontal portion (11) ) Has an inverted T-shaped cross section and has a predetermined length in the longitudinal direction; The horizontal portion 11 or the vertical portion 12 of the reinforcing member 1 is provided with a reinforcing member, characterized in that the shear connector 14 is provided.

Hybrid, resin, reinforcement member, reinforcement, fiber reinforcement, concrete reinforcement

Description

Reinforcing member for reinforcement of concrete structure and reinforcing method using same {Device and Method for Reinforcing Concrete Structure}             

1A and 1B are schematic perspective views of reinforcing members made of steel, respectively, according to the present invention.

Figure 2a is a schematic perspective view of a reinforcing member according to an embodiment made of a new structure of the hybrid FRP material developed by the applicant.

Figure 2b is a schematic exploded perspective view of the reinforcing member shown in Figure 2a.

3A and 3B are schematic perspective views for explaining a method of reinforcing concrete molds by using a reinforcing member made of steel shown in FIG. 1A and a reinforcing member made of hybrid FRP shown in FIG. 2A.

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* Explanation of symbols for the main parts of the drawings *

 1 reinforcing member 2 longitudinal fibers

 3 resin 4 upper layer

 5 Underlayer 6 Fiber Mat

 7 Fiber mat layer 11 Horizontal section

12 vertical section

The present invention relates to a reinforcing member for reinforcing a concrete structure and a reinforcing method using the same. Specifically, the fiber mat is included in fiber reinforced plastics (hereinafter referred to as "FRP"), so that the longitudinal direction as well as The present invention relates to a new type of reinforcing member for reinforcing a concrete structure by using a FRP hybrid reinforcing material or steel of a new structure having enhanced strength in the transverse direction, and a reinforcing method using the same.

The reinforcement method of the concrete structure that has been most commonly practiced before is, the wide surface of the plate-shaped reinforcement member having a predetermined width is positioned so as to cover the bottom surface of the concrete mold, and then using a resin adhesive such as epoxy or anchor bolt The reinforcing member of the jacket was attached to the concrete mold.

However, when the plate-shaped reinforcing member is attached horizontally, it is difficult to expect a large reinforcing effect because the cross-sectional difference moment of the reinforcing member is small. In addition, since the reinforcing member is only attached to the surface by the resin adhesive, when the adhesion state is poor, there is a problem that the reinforcing effect is sharply lowered.

As the material of the reinforcing member as described above, FRP may be used. In the conventional FRP, the fibers contained therein are arranged side by side only in the longitudinal direction, and in the transverse direction, they have only a binding force by resin. In the transverse direction it has very weak tensile strength. This is because the restraining force in the transverse direction is expressed only by the resin, because the resin is a material that causes brittle fracture and is very vulnerable to tensile force. Therefore, even if only a weak tensile force or bending stress is applied in the transverse direction, such a long crack occurs in the longitudinal direction, so that the FRP easily breaks. The phenomenon of FRP due to the longitudinal cracking results in a sharp cross-sectional change of the sheet, which in turn causes brittle fracture in which the sheet is sharply cut in the longitudinal direction.

Therefore, when the plate-shaped reinforcing member made of the conventional FRP is simply attached to the surface of the concrete structure to reinforce, there is always a risk of sudden destruction of the FRP and loss of the reinforcing effect.

The present invention was developed in order to overcome the limitations of the conventional reinforcement method as described above, specifically provides a reinforcement member having a new shape and structure to reinforce the concrete structure more safely and effectively, and a reinforcement method using the same. It aims to do it.

In addition, in the present invention, by utilizing the characteristics of the hybrid type FRP having a new structure that improves the lateral strength of the FRP reinforcement plate to prevent the FRP reinforcement plate is sharply broken by the longitudinal cracking, the light weight, high strength It is an object of the present invention to provide a new reinforcement member and a reinforcement method using the same to fully exhibit the advantages of the reinforcing material.

In order to achieve this object, in the present invention is a reinforcing member attached to the concrete structure to reinforce the concrete structure, the reinforcing member is composed of a flat horizontal portion, and a vertical portion protruding at a predetermined height in the center of the horizontal portion of the inverted T-shaped Has a cross section and has a predetermined length in the longitudinal direction; The reinforcing member is provided in the horizontal portion or the vertical portion of the reinforcing member is provided with a shear connecting material.

In addition, in the present invention, as a specific embodiment of the reinforcing member, the reinforcing member is a half of the horizontal portion and the vertical portion each form a "b" shape and then the vertical portions are combined with each other to form an inverted T-shaped cross section Reinforcing members are provided.

In addition, in the present invention, as a specific embodiment of the reinforcing member, the reinforcing member, the upper layer and the lower layer and the longitudinal and transverse fibers formed by impregnating the resin in a state in which fibers are arranged side by side in the longitudinal direction, lattice There is provided a reinforcing member comprising a hybrid fiber reinforced plastic having a structure in which a fibrous mat layer formed in a shape and impregnated with a resin-like fiber mat is integrally provided between the upper layer and the lower layer.

In addition, in the present invention, as a reinforcing method for attaching and reinforcing a concrete member to a concrete structure, comprising a flat horizontal portion and a vertical portion protruding at a predetermined height in the center of the horizontal portion having an inverted T-shaped cross section and predetermined in the longitudinal direction A reinforcing member having a length, the shearing member being provided in a horizontal portion or a vertical portion of the reinforcing member; A longitudinal concave portion and a transverse concave portion are formed on a surface in need of reinforcement of the concrete structure in accordance with the vertical portion of the reinforcement member, the mounting position and the insertion size of the shear connector; Placing a vertical portion of the reinforcement member and a shear connecting member in the concave portion, respectively, and installing a reinforcement member so that the surface of the horizontal portion contacts the outer surface of the concrete structure; Prefilling or applying an adhesive such as epoxy in the recess and between the horizontal portion and the outer surface of the concrete structure, the installed reinforcing member acts on the concrete structure by integrating the reinforcing member with the concrete structure by curing the adhesive material. The reinforcing method is provided by reinforcing the concrete structure by causing the reinforcing member to bear the stress.

In the reinforcing method of the present invention, the reinforcing member is made of steel or hybrid FRP.

Hereinafter, with reference to the accompanying drawings will be described the configuration and effect of the present invention.

1A and 1B show an embodiment of the reinforcing member according to the present invention, respectively.

As shown in the figure, the reinforcing member 1 according to the present invention has a shape having a reverse T-shaped cross section and a predetermined length in the longitudinal direction. Specifically, the reinforcing member 1 is composed of a flat horizontal portion 11 and a vertical portion 12 protruding at a predetermined height in the center of the horizontal portion 11 to have a length necessary for reinforcement in the longitudinal direction. do.

A plurality of holes 13 are formed in the vertical portion 12 of the reinforcing member 1, and when the holes 13 are coupled to a concrete structure requiring reinforcement, as described below, the filler may fill the holes 13. By hardening in the flow state through the reinforcing member 1 performs a function to be more firmly coupled with the filler, and may also be used to install a protruding shear connector 14 as described below. Of course, the shear connector 14 may be mounted by welding or adhesive in addition to the method of inserting and inserting it into the hole 13 described above.

As illustrated in FIG. 1A, the horizontal portion 11 and the vertical portion 12 may be formed of a plate material, and may be integrally formed with each other to form an integral reinforcing member 1, but as illustrated in FIG. 1B, the horizontal portion 11 ) And the half of the vertical portion 12 may each form a "b" shape and then be joined to each other by welding, adhesive, or the like, to form an inverted T-shaped reinforcing member 1.

On the other hand, Figure 2a is shown an embodiment of the reinforcing member 1 made of a hybrid FRP material of the new structure developed by the applicant. The reinforcing member 1 made of a hybrid FRP material also has an inverted T-shaped cross section composed of a horizontal portion 11 and a vertical portion 12, as in the embodiment shown in FIG. 1A.

Looking specifically at the structure of the hybrid FRP, the hybrid FRP, unlike the conventional FRP in which only the longitudinal fibers are arranged side by side in the resin, the longitudinal and transverse fibers are arranged in a lattice, the mat shape It has a structure in which a fibrous mat forming a resin is further included in the resin.

 Figure 2b schematically shows an exploded perspective view of the inverted T-shaped reinforcing member (1) produced by the hybrid FRP, the hybrid FRP is a resin (3) in a state in which the fibers (2) are arranged side by side in the longitudinal direction A fibrous mat formed by impregnating the resin 3 with an upper layer 4 and a lower layer 5 impregnated in the < RTI ID = 0.0 >), < / RTI > The layer 7 has a structure in which it is integrally provided between the upper layer 4 and the lower layer 5. In FIG. 2B, the resin 3 is shown in dashed lines so that the longitudinal fibers 2 and the fiber mat 6 are easily seen for convenience.

The upper layer 4, the lower layer 5 and the fibrous mat layer 7 are merely for illustrative purposes only and are not attached after their respective layers are formed separately. In the manufacturing process of the hybrid FRP, the longitudinal fibers 2 and the fiber mat 6 are impregnated in the liquid resin 3 at the same time so that each layer is formed to be integral.

The longitudinal fibers 2 disposed in the longitudinal direction in the upper layer 4 and the lower layer 5 are arranged side by side in the longitudinal direction of the hybrid FRP reinforcing member 1, that is, in the longitudinal direction, whereas the fiber mat 6 is Since the fibers are already formed in a mat shape arranged to form a lattice shape in the longitudinal direction and the transverse direction, the hybrid FRP reinforcement member 1 according to the present invention is also arranged in the transverse direction reinforcing fibers. Various fibers may be used as the fibers constituting the fiber mat 6, and glass fibers, carbon fibers, and the like may be used as examples. In addition, various fibers may also be used as the longitudinal fibers 2 disposed on the upper layer 4 and the lower layer 5, for example, carbon fibers, aramid fibers, and the like.

In the hybrid FRP having the above configuration, since the lateral fibers of the fiber mat 6 are also present in the lateral direction, the reinforcement is performed by the fibers in the lateral direction, and thus the stress is evenly distributed throughout the fiber. Even if a direct tensile force or a tensile force by bending acts in the transverse direction of the member, the reinforcing member has rigidity against it, so that the crack does not occur rapidly due to long cracks in the longitudinal direction as in the conventional FRP. do.

In the conventional FRP, the reverse T-shaped reinforcing member 1 cannot be made as shown in FIG. 2A (in the conventional FRP, the vertical part can be easily split by the longitudinal crack and separated from the horizontal part). Since the reinforcement is also performed in the direction, the reverse T-shaped reinforcement member 1 can be achieved.

On the other hand, as shown in Figure 2a, when manufacturing the reinforcing member 1 with a hybrid FRP, the shear connecting member 14 may have an inverted T-shape, not a rod-shaped. The inverted T-shaped shear connector 14 may also be manufactured by hybrid FRP, and the shear connector 14 may be integrally attached to the reinforcing member 1 using an adhesive.

Next, a concrete method of installing and reinforcing the reinforcing member 1 according to the present invention having the inverted T-shape as described above will be described.

3A and 3B respectively show a reinforcement member 1 made of steel shown in FIG. 1A and a reinforcement member 1 made of a hybrid FRP shown in FIG. 2A with respect to a concrete mold 20 as an example of a structure requiring reinforcement. A schematic exploded perspective view and a combined perspective view for explaining the method of reinforcement using the is shown. Although the concrete mold 20 is illustrated as an example of the structure that needs to be reinforced, the present invention is not necessarily limited thereto.

First, the height of the vertical portion 12, such that the vertical portion 12 of the reinforcing member 1 can be inserted into the outer surface of the concrete structure (in the illustrated embodiment, the lower surface of the concrete mold) that requires reinforcement for tensile force. The longitudinal recesses 21 are formed to the corresponding depths. In addition, on the surface of the concrete structure, a transverse recess 22 is formed at the corresponding position so that the shear connecting member 14 provided in the form protruding in the vertical portion 12 of the reinforcing member 1 can be inserted. do.

In this way, after the recesses 21 and 22 are formed on the outer surface of the concrete structure, the reinforcing member 1 according to the present invention having an inverted T-shape, the vertical part 12 and the shear connecting member 14, respectively, Located in the recesses (21, 22) is installed so that the surface of the horizontal portion 11 is in contact with the outer surface of the concrete structure. At this time, in the recesses 21 and 22 and between the horizontal portion 11 and the outer surface of the concrete structure, an adhesive 31 such as epoxy is filled or applied in advance. When the adhesive 31 is completely cured after installing the reinforcing member 1 as described above, the reinforcing member 1 and the concrete structure, that is, the concrete mold 20 are structurally integrated, and the stress acting on the concrete mold 20 is reduced. The reinforcement member 1 is divided and burdened to exert the effect of reinforcing the concrete mold 20.

On the other hand, Figure 3b is a perspective view of a state in which the reinforcing member 1 made of a hybrid FRP coupled to the concrete mold 20 is shown, using a reinforcement member 1 made of a hybrid FRP as shown in the figure In the case of reinforcing 20, the corner portion of the concrete mold 20 has a "b" shape and additional reinforcing member 30 made of hybrid FRP is further reinforced by the adhesive material 31 to reinforce the reinforcing effect. You can even double it.

As described above, when reinforcing the concrete structure using the inverted T-shaped reinforcement member 1 according to the present invention, the conventional plate-shaped reinforcement member by the shape of the reinforcement member 1 called the inverted T-shape Compared with the larger cross-sectional moment, the reinforcement effect is doubled.

In particular, in the case of the conventional plate-shaped reinforcing member is only attached to the surface of the concrete structure, the surface and the reinforcing member of the concrete structure can be easily detached, in the present invention, the vertical portion 12 of the reinforcing member 1 is concrete Since it is embedded in the structure to be integrated, the reinforcing member 1 and the concrete structure is more fully coupled, so that the reinforcing member 1 and the concrete structure behave as a single structure, so that the reinforcing effect is excellent.

In addition, the reinforcing member of the present invention can also be manufactured as a hybrid FRP, such hybrid FRP has the same advantages as the previous FRP has the advantages, such as light weight, high strength, high durability, workability, etc. All the advantages of the T-shape can be exhibited, so the reinforcing effect is more excellent.

Although the embodiments of the present invention have been described above, the present invention is not limited to the described embodiments, and various modifications and improvements can be made without departing from the spirit and scope of the present invention.

Claims (4)

As a reinforcing member attached to the concrete structure to reinforce the concrete structure, The reinforcing member 1 consists of a flat horizontal part 11 and a vertical part 12 protruding at a predetermined height in the center of the horizontal part 11 and inserted into a concave part 21 formed in a concrete structure. Has a T-shaped cross section; Reinforcing member, characterized in that the shear connector (14) is provided in the horizontal portion (11) or vertical portion (12) of the reinforcing member (1). The method of claim 1, The reinforcing member (1) is a reinforcing member, characterized in that the half of the horizontal portion (11) and the vertical portion (12) each form a "b" shape and then coupled to each other to form an inverted T-shaped cross section. The method according to claim 1 or 2, wherein the reinforcing member 1, The upper layer 4 and the lower layer 5 impregnated with the resin 3 in the state in which the fibers 2 are arranged side by side in the longitudinal direction, and the fibers in the longitudinal and transverse directions are arranged in a lattice shape to form a mat shape. It is characterized in that the fiber mat layer 7 formed by impregnating the fiber mat 6 with the resin 3 is made of a hybrid fiber reinforced plastic having a structure in which the fiber mat 6 is integrally provided between the upper layer 4 and the lower layer 5. Reinforcing member. Reinforcement method to reinforce by attaching reinforcement member to concrete structure, A flat horizontal portion 11 and a vertical portion 12 protruding at a predetermined height in the center of the horizontal portion 11 has an inverted T-shaped cross section and has a predetermined length in the longitudinal direction, and the reinforcing member 1 A reinforcing member 1 is manufactured in the horizontal portion 11 or the vertical portion 12 of the c) such that the shear connecting member 14 is provided; On the surface in need of reinforcement of the concrete structure, the longitudinal recesses 21 and the transverse recesses 22 are formed in accordance with the installation position and the insertion size of the vertical portion 12 and the shear connector 14 of the reinforcement member 1. Forming; The reinforcing member 1 is positioned so that the vertical portion 12 and the shear connecting member 14 of the reinforcing member 1 are positioned in the recesses 21 and 22, respectively, and the surface of the horizontal portion 11 contacts the outer surface of the concrete structure. ); In the recesses 21 and 22 and between the horizontal part 11 and the outer surface of the concrete structure, an adhesive material such as epoxy is pre-filled or applied, so that the installed reinforcing member 1 is formed by curing the adhesive material. Reinforcement method, characterized in that the reinforcing the concrete structure by 1) to be integrated with the concrete structure to the stress to the reinforcing member (1) acting on the concrete structure.

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