KR101613430B1 - Rehabilitated Structure Having Anchor Type FRP Layer and Manufacturing Method Thereof - Google Patents

Abstract

The reinforcement structure provided with the anchor type FRP layer according to the present invention includes a civil engineering or building structure having grooves formed on one surface thereof and an FRP layer provided on one surface of the concrete structure having the grooves formed thereon.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcement structure having an anchor type FRP layer,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a reinforcement structure having an anchor FRP layer, and more particularly, to a reinforcement structure having an anchor FRP layer, in which FRP sheets provided on one side of a civil engineering or building structure are led into grooves formed in civil engineering or building structures, And an anchor type FRP layer for improving the frictional force by improving the area and delaying the occurrence and progress of adhesion failure.

Generally, reinforced concrete structures are widely used because they are excellent in durability, fire resistance, workability and dimensionality, and have high rigidity and resistance to horizontal load and deformation, low maintenance cost, and high economic efficiency.

Nonetheless, reinforced concrete structures are less susceptible to cracking, strength degradation, or deformation due to errors during construction, changes in building use, repeated loading, changes in material properties over time, or environmental changes There is a problem that the internal strength is lowered or a problem occurs in use.

In order to reinforce such problems, various reinforcement methods such as a cross sectional enlargement method, a post tension method, a steel plate attaching method, and an adhesive reinforcement method using a fiber sheet have been developed.

Although the sectional enlargement method increases the rigidity of the member, the self weight of the member increases with an increase in the cross section, and the space for securing and utilizing the working space is limited.

The steel plate attachment method has a problem that there is little change in the size of the member cross section and the construction is simple, but the handling is inconvenient, the corrosion and fire resistance performance is weak, and the brittle reinforcing plate is detached.

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SUMMARY OF THE INVENTION The present invention has been made in order to solve the conventional problems, and it is an object of the present invention to improve the frictional force by increasing the contact area of the FRP sheet by allowing the FRP sheet provided on one side of the civil engineering or building structure to be inserted into the groove formed in the civil engineering or building structure like an anchor It is an object of the present invention to provide a reinforcement structure having an anchor-type FRP layer that delays the occurrence and progress of adhesion failure.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the object of the present invention, a reinforcement structure including an anchor-type FRP layer includes a civil engineering or building structure having a groove formed on one surface thereof, and an FRP layer provided on one side of the civil engineering or building structure do.

At this time, the FRP layer is an FRP sheet, and may be provided in a folded state at a position corresponding to the groove.

Further, the grooves may be formed so as to pass through the width direction of the civil engineering or building structure.

Further, the edges of the grooves may be rounded or chamfered.

Further, a resin layer may be further provided between the civil engineering or building structure and the FRP layer.

Further, an auxiliary FRP layer may be further provided on the outer surface of the FRP layer.

Further, the auxiliary FRP layer may be an FRP sheet.

Further, the auxiliary FRP layer may be formed only at a position corresponding to the plurality of grooves.

Also, the auxiliary FRP layer may have an area corresponding to the FRP layer.

Further, a resin layer may be further provided between the FRP layer and the auxiliary FRP layer.

In another category, a method of manufacturing a reinforced structure having an anchor FRP layer for achieving the object of the present invention includes the steps of: forming at least one groove on one side of a civil engineering or building structure; Forming a resin layer on at least one of the one surface and the FRP sheet, and folding the FRP sheet into the grooves formed in the civil engineering or building structure in the resin layer and attaching the FRP sheet in an anchor form.

At this time, it may further include attaching the auxiliary FRP sheet to the other surface of the FRP sheet.

The reinforcing structure provided with the anchor type FRP layer according to the present invention has the following effects.

First, the FRP sheet is inserted into grooves formed in civil engineering or building structures to serve as an anchor, thereby improving the adhesion strength of the FRP sheet and improving the durability against loads of civil engineering or building structures.

Second, the FPR sheet is inserted into a groove formed in a civil engineering or building structure to serve as an anchor, thereby improving the adhesive strength between the civil engineering or building structure and the FRP sheet, thereby suppressing the occurrence time and progress of the adhesion failure.

Third, the FPR sheet is inserted into a groove formed in a civil engineering or building structure to serve as an anchor, so that an adhesive failure having the characteristic of brittle fracture can be broken down as close to ductile fracture.

Fourth, since the FRP sheet acts as an anchor, the installation cost is reduced because a separate mechanical device such as a U-shaped strip is not used, and the present invention can be applied even when the FRP sheet fixing device is difficult to use.

Fifth, since the FRP sheet is inserted into the groove of the civil engineering or building structure in an anchor form, the efficiency of attaching the FRP sheet is maximized.

Sixth, because FRP sheet is used instead of injection method, it can be applied to existing civil engineering or building structure.

Seventh, even if tensile deformation occurs in the civil engineering or building structure, it is possible to prevent the FRP sheet, which has been drawn in the folded state, from being folded out while a predetermined length is discharged.

Eighth, there is an effect that rounding or chamfering the corner portion of the groove formed in the civil engineering or building structure improves the bonding efficiency of the FRP sheet and minimizes peeling of the FRP sheet.

Ninth, the auxiliary FRP sheet has the effect of reinforcing the tensile property of the folded portion of the FRP sheet.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, And shall not be interpreted.
1 is a perspective view of a reinforcement structure having an anchor FRP layer according to the present invention;
2 is a side view of a reinforcement structure having an anchor FRP layer according to the present invention;
3 is a partially enlarged view of Fig. 2; Fig.
Fig. 4 is an enlarged view of part A of Fig. 2 according to a modification of the present invention;
5 is a bottom perspective view of a reinforcement structure having an anchor FRP layer according to another embodiment of the present invention;
6 is a flowchart sequentially illustrating a method of manufacturing a reinforcement structure having an anchor FRP layer according to the present invention; And
FIG. 7 is a side view showing a use structure of a reinforcement structure provided with an anchor type FRP layer according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Construction of reinforcement structure with anchor type FRP layer

FIG. 1 is a perspective view of a reinforcement structure having an anchor type FRP layer according to the present invention, and FIG. 2 is a side view of a reinforcement structure having an anchor type FRP layer according to the present invention.

1 and 2, the reinforcement structure 100 including the anchor type FRP layer according to the present invention includes a civil engineering or building structure 100, a resin layer 300, and a fiber reinforced polymer (FRP) sheet (200).

The civil engineering or building structure 100 is a civil engineering or building structure commonly used in the industry. The civil engineering or building structure 100 may be made of various materials such as concrete, steel, and wood, but the concrete structure of the present invention will be described as an example.

The civil engineering or building structure 100 is manufactured by installing a formwork and a reinforcing bar in the same manner as the method of manufacturing a concrete structure conventionally used in the art, and pouring and curing the concrete mixed at a predetermined ratio in the formwork. The civil engineering or building structure 100 uses a concrete structure, preferably a reinforced concrete structure, conventionally used in the art.

At this time, the shape of the civil engineering or building structure 100 can be variously formed according to the use mode. The present invention will be described on the basis of a civil engineering or building structure 100 having a T-shaped longitudinal section, and the drawings are also shown correspondingly. However, it should be understood that the present invention is not limited thereto.

A plurality of grooves spaced from each other along the longitudinal direction are formed on one surface of the civil engineering or building structure 100 constructed as described above. 1 to 3, a plurality of grooves spaced apart from each other along the longitudinal direction are formed on the lower end surfaces of the T-shaped reinforcing bar or the building structure 100. Such a plurality of grooves is intended to increase the contact area between the FRP sheet 200 and the civil engineering or building structure 100 to increase the adhesive strength. This is because the formation of the plurality of grooves not only increases the interface area between the FRP sheet 200 and the civil engineering or building structure 100, but also increases the adhesion strength.

As described above, the plurality of grooves formed on the bottom surface of the civil engineering or building structure 100 are formed to penetrate in the width direction of the civil engineering or building structure 100. This is to facilitate entry of the FRP sheet 200 to be described later. However, it is obvious that the grooves may be formed so as not to penetrate the width direction of the civil engineering or building structure 100 depending on the width and shape of the FRP sheet 200 depending on the use mode.

In addition, the longitudinal cross-section of the plurality of grooves can be formed variously according to the use mode such as a square shape, a circular shape, The grooves may be formed by using a formwork at the stage of placing the civil engineering or building structure 100 using concrete, or may be formed by using an electric saw or the like for concrete after the concrete installation of the civil engineering or building structure 100 is completed It is possible to form the groove through the operation of FIG. Such a groove forming method may also be selectively and variously used depending on the user's selection.

Since the resin layer 300 and the FRP sheet 200 to be described later are to be drawn and the FRP sheet 200 to be introduced is not bent at right angles, the grooves are formed in the grooves so as to maximize the contact area with the FRP sheet 200 It is possible to maximize the contact area with the FRP sheet 200 by rounding or chamfering the FRP sheet 200, and prevent the FRP sheet 200 from rising at the corner.

The depth and number of such grooves may take into account the use of the civil engineering or building structure 100, the load generated in the structurally calculated civil engineering or building structure 100 and the placement of the reinforcing bars inserted into the civil engineering or building structure 100, And can be selectively formed in various ways.

The resin layer 300 is formed on one side of the civil engineering or building structure 100, preferably on one side of the civil engineering or building structure 100 having a plurality of grooves. The resin layer 300 may be formed by spraying a resin solution or by attaching a resin sheet or the like. When the resin layer 300 is formed, the resin layer 300 may be uniformly formed on the lower end surface of the civil engineering or building structure 100 and the inner wall surface of the plurality of grooves.

3 is an enlarged view of a portion A in Fig. That is, when the resin layer 300 is formed by spraying, the resin layer 300 is sprayed on the inner surface of the groove so that the resin layer 300 can be formed. In the case of using the resin sheet, It is preferable that the resin sheet is led into the groove so as to be folded into the groove.

The resin layer 300 may be made of any material as long as it can improve the adhesive strength and adhesion between the civil engineering or building structure 100 and the FRP sheet 200. It is preferable to use an epoxy resin .

The FRP sheet 200 is attached to one side of a civil engineering or building structure 100 through a resin layer 300 such as epoxy to complement and improve the structural performance of the civil engineering or building structure 100. [

FRP is lightweight, has high tensile strength, is resistant to corrosion and is used mainly in the aerospace industry, and is also being applied to civil engineering structures (100). These FRP shapes are the same as fibers, and are used as reinforcing materials for reinforcing civil engineering or building structures (100) by attaching epoxy to fibers and attaching them to concrete. FRP is CFRP using carbon fiber and GFRP using glass fiber depending on fiber type.

The FRP sheet 200 described above can be used as the FRP sheet 200 commonly used in the art.

The FRP sheet 200 may have a plurality of FRP sheets 200 each having an area corresponding to the area of the civil engineering or building structure 100 to be attached or having a relatively thinner width than the mounting surface of the civil engineering or building structure 100 Can be used. The use of the FRP sheet 200 is selectively used depending on the shape of the groove formed in the civil engineering or building structure 100.

For example, when a groove formed on one surface of a civil engineering or building structure 100 is formed to penetrate in the width direction of a civil engineering or building structure 100, the same area as the area of the civil engineering or building structure 100 in which the groove is formed The FRP sheet 200 can be used. The groove of the civil engineering or building structure 100 is formed so as to penetrate in the width direction, so that even if the FRP sheet 200 is folded into the groove, it can be drawn into the groove without wrinkling in the width direction.

5 is a bottom perspective view of a reinforcement structure having an anchor FRP layer according to another embodiment of the present invention. As another example, as shown in FIG. 5, the grooves formed on one surface of the civil engineering or building structure 100 may be formed at the center of one surface of the civil engineering or building structure 100 so as not to penetrate in the width direction of the civil engineering or building structure 100 When the FRP sheet 200 is designed to have an area corresponding to the area of the civil engineering or building structure 100, the FRP sheet 200 ) Is wrinkled, and therefore, the attachment is not smooth. In this case, the width of the FRP sheet 200 is formed to have a width corresponding to the width of grooves formed in the civil engineering or building structure 100, so that the FRP sheet 200 is folded in.

When the grooves of the civil engineering or building structure 100 are formed so as to be arranged in the width direction rather than in the width direction of the civil engineering or building structure 100, the width of each FRP sheet 200 ) Are preferably used in plural.

As described above, the FRP sheet 200 is provided so that it can be folded into grooves formed on one side of the civil engineering or building structure 100 as a whole, with a difference in the number of the FRP sheets 200 used. As such, when the FRP sheet 200 is folded and inserted into the grooves like an anchor, it is possible to improve the adhesion of the FRP sheet 200 to the civil engineering or building structure 100 when the FRP sheet 200 is in surface contact. That is, the FRP sheet 200 folded into the grooves of the civil engineering or building structure 100 serves as an anchor without a separate device such as nails or bolts.

When the thickness of the groove of the civil engineering or building structure 100 is larger than the folded state of the FRP sheet 200, that is, twice the thickness of the FRP sheet 200, the folded FRP sheet 200 is anchored The FRP sheet 200 can be stacked more than two sheets, or the folded portion can be repeatedly used.

Although the present invention has been described on the basis of the use of the FRP sheet 200, it is also possible to form the FRP layer by spraying the FRP using an injection device, depending on the usage.

4 is an enlarged view of a portion A of Fig. 2 according to a modification of the present invention. As an alternative, the FRP sheet 200 further includes an auxiliary FRP sheet 400 at the bottom. At this time, the auxiliary FRP sheet 400 may have an area corresponding to that of the FRP sheet 200, or may have an area corresponding to the grooved portion of the civil engineering or architectural structure 100, that is, Or may be formed long along the width direction of the building structure 100.

At this time, the auxiliary FRP sheet 400 may use the same sheet as the FRP sheet 200, or may use a different sheet.

A resin layer 300 may also be formed between the FRP sheet 200 and the auxiliary FRP sheet 400 for the attachment of the auxiliary FRP sheet 400.

Method and method of manufacturing a reinforced structure having an anchor FRP layer

The construction method and use of the reinforcement structure having the anchor FRP layer according to the present invention will be described in detail as follows.

6 is a flowchart sequentially illustrating a method of manufacturing a reinforcement structure having an anchor FRP layer according to the present invention. First, as shown in FIG. 6, at least one groove is formed on one surface of the civil engineering or building structure 100 (S100). At this time, the civil engineering or building structure 100 to be used may be a previously installed civil engineering or building structure 100 or a civil engineering or building structure 100 newly installed and not used at a construction site.

In the case of a newly installed civil engineering or building structure 100, two methods can be used as a groove forming method. One may form a groove using a concrete cutting saw, or a groove may be formed using a form in a concrete pouring step.

In the case of the installed civil engineering or building structure 100, a groove is formed by using a concrete cutting saw.

When a plurality of grooves are formed, the depths of the grooves may be different from each other. For example, when reinforcing bars are inserted into the civil engineering or building structure 100, the grooves formed at positions corresponding to the reinforcing bars are formed relatively low, and the grooves formed at positions where the reinforcing bars are not inserted are relatively deeply formed can do. Since the anchoring performance of the FRP sheet 200 is improved as the depth of the groove is increased, it is preferable that the groove is formed at a certain depth or more.

Next, the resin layer 300 is formed on at least one side of the grooved civil engineering or building structure 100 or the FRP sheet 200 (S200). The resin layer 300 is preferably formed on both sides of the mounting surface of the civil engineering or building structure 100 and the FRP sheet 200. [ The resin layer 300 is formed using a spray or a resin sheet.

At this time, when the civil engineering or building structure 100 is made of a structure having low surface strength such as concrete, it is preferable to use sand blasting or grinding to remove impurities on the surface of the civil engineering or building structure 100 It is preferable to form the resin layer 300 after removing other weak lumps. As described above, when the resin layer 300 is formed after surface treatment using sandblasting or grinding, the adhesion strength can be improved.

Next, the FRP sheet 200 is attached to one side of the civil engineering or building structure 100 having the grooves (S300). At this time, the resin layer 300 facilitates the attachment of the FRP sheet 200 between the FRP sheet 200 and the civil engineering or building structure 100.

The width of the FRP sheet 200 corresponds to the width of the groove formed on one side of the civil engineering or building structure 100 and is provided along the longitudinal direction of the civil engineering or building structure 100. At this time, the FRP sheet 200 is folded and drawn in the grooved portion, so that the FRP sheet 200 performs an anchor function. As described above, since the FRP sheet 200 serves as an anchor, it is possible to slow the adhesion failure time of the FRP sheet 200 and the civil engineering or building structure 100, and to prevent the development of the adhesion failure. This allows the destruction of existing brittle fracture to proceed as close to ductile fracture as possible.

The FRP sheet 200 is pressurized using a roller or the like and attached to the civil engineering or building structure 100. Even if the position of the FRP sheet 200 is disturbed or changed by pressing the FRP sheet 200 into the groove, the FRP sheet 200 is attached by applying a pressure using a roller or the like to correct the position of the FRP sheet 200 Stable attachment is possible.

FIG. 7 is a side view showing a use structure of a reinforcement structure provided with an anchor type FRP layer according to the present invention. 7, when the deformation of the civil engineering or building structure 100 occurs, the FRP sheet 200, which has been drawn into the inside of the groove, is deformed by the deformation length of the civil engineering or building structure 100, So that it is possible to suppress occurrence of adhesion failure.

Next, a resin layer 300 and an auxiliary FRP sheet 400 are additionally provided on the lower surface of the FRP sheet 200 (S400 and S500). Since the auxiliary FRP sheet 400 supports the entire or folded portion of the FRP sheet 200, it is possible to reinforce the folded FRP sheet 200 to suppress the breakage of the FRP sheet 200.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: civil or architectural structure
200: FRP sheet
300: resin layer
400: Secondary FRP sheet

Claims (12)

A civil engineering or building structure having a plurality of grooves spaced apart from each other along a longitudinal direction on a lower surface spaced apart at a predetermined distance from an end; And
An FRP layer provided on one surface of the concrete structure having the grooves along the longitudinal direction of the civil engineering or building structure;
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Wherein the FRP layer is composed of FRP sheets corresponding to the grooves or having a relatively narrow width and having a longitudinal direction corresponding to the longitudinal direction of the civil engineering or building structure, An anchor type FRP layer that is drawn in a folded state at a position corresponding to the plurality of grooves so as to serve as an anchor and is provided so as to fill the grooves while adjacent FRP layers arranged to face each other while being in contact with each other Reinforced structures. delete The method according to claim 1,
Wherein the groove has an anchor-shaped FRP layer formed to penetrate through the width direction of the civil engineering or building structure. The method according to claim 1,
And an edge of the groove is rounded or chamfered. The method according to claim 1,
And an anchor FRP layer having a resin layer between the civil engineering or building structure and the FRP layer. The method according to claim 1,
And an anchor FRP layer provided on the outer surface of the FRP layer. The method according to claim 6,
Wherein the auxiliary FRP layer is an FRP sheet. The method according to claim 6,
Wherein the anchor FRP layer is formed only at a position corresponding to the plurality of grooves. The method according to claim 6,
Wherein the auxiliary FRP layer has an anchor FRP layer having an area corresponding to the FRP layer. The method according to claim 6,
And an anchor FRP layer having a resin layer between the FRP layer and the auxiliary FRP layer. Forming a plurality of grooves spaced apart from each other along a longitudinal direction on a lower surface spaced apart at a predetermined distance from an end of a civil engineering or building structure;
Forming a resin layer on at least one of a surface of the civil engineering or building structure on which the grooves are formed and an FRP sheet; And
The FRP sheet having a longitudinal direction corresponding to the longitudinal direction of the civil engineering or building structure and having a width corresponding to the groove or a relatively narrow width is attached to the resin layer along the longitudinal direction of the civil engineering or building structure, Folding the FRP sheet at a position corresponding to the plurality of grooves so that the sheet can serve as an anchor, and adhering the FRP sheets so that adjacent FRP layers arranged to face each other when they are pulled in contact with each other to fill the grooves;
And an anchor FRP layer formed on the anchor FRP layer. 12. The method of claim 11,
Further comprising the step of attaching an auxiliary FRP sheet to the other surface of the FRP sheet.

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