KR101524031B1

KR101524031B1 - Improved Structural Reinforcing methods of Concrete Structures by anchoring the Carbon Fibre Sheets to the Carbon Fibre Laminates on both sides

Info

Publication number: KR101524031B1
Application number: KR1020140169694A
Authority: KR
Inventors: 김원기
Original assignee: 김원기
Priority date: 2014-12-01
Filing date: 2014-12-01
Publication date: 2015-05-29

Abstract

The present invention relates to a reinforcing method of a concrete structure which improves a stiffening force by anchoring the carbon fibre sheets to the carbon fibre laminates on both sides configured to anchor the carbon fibre sheets on both sides of the carbon fibre laminates having an early falling-off after attaching the carbon fibre laminates for reinforcing concrete structures. The reinforcing method of a concrete structure comprises: an attachment intensity measurement and attaching surface reparation working stage; a surface processing stage; a carbon fibre laminates position marking stage: an adhesives application stage; a carbon fibre laminates attaching stage; and a carbon fibre sheets attaching stage, wherein physical properties of the carbon fibre laminates can be utilized perfectly, and at an additional anchoring at both sides of the carbon fibre laminates through the carbon fibre sheets, reinforcing ability can be enhanced by executing anchoring strictly not generating deterioration of concrete structures and additionally, reinforcing ability can be enhanced by anchoring the carbon fibre sheets on the carbon fibre laminates.

Description

Technical Field [0001] The present invention relates to a method of reinforcing a concrete structure by anchoring a carbon fiber reinforced sheet to a carbon fiber reinforced plate,

The present invention relates to a carbon fiber reinforced sheet for anchoring a carbon fiber reinforced sheet at both ends of a carbon fiber reinforced plate where early dropping occurs after attaching a carbon fiber reinforced plate for reinforcing concrete structures, And a reinforcing method of a concrete structure.

Generally, as a method of reinforcing a concrete structure, a reinforcement method in which an additional repair material is attached to the structure is most commonly used.

At present, known reinforcing materials include steel sheets and special fiber materials. Examples of the special fiber materials include carbon fiber sheets, carbon plate composites, aramid fibers, and glass fibers.

On the other hand, as a conventional reinforcing method, a method of simply attaching a reinforcing material to a surface of a concrete structure to be reinforced is widely practiced.

More specifically, it includes a chipping step for chipping a part to be reinforced, a high pressure washing step for washing the chipped surface with high pressure, a leveling step for evenly cleaning the high pressure washed surface, An adhering step of applying an adhesive, and an adhering step of adhering a reinforcing material to the surface to which the adhesive is applied.

Epoxy adhesives are widely used as the adhesive, and the above-mentioned special fiber materials are often adopted as the reinforcing material.

On the other hand, the present inventor has proposed Korean Patent No. 10-0426257 (Mar. 31, 2004), a method of reinforcing a reinforcing material horizontally inserted structure prior to this application.

The patent discloses that after a groove is formed in a concrete structure, a reinforcing material and a plaster are successively applied to the groove, and the reinforcing material is not exposed from the outside, so that the appearance is beautiful and the risk of fire is prevented.

Korean Patent Laid-Open No. 10-2003-0081910 (Oct. 22, 2003) discloses a technique in which an epoxy adhesive is applied to the surface of a bridge beam, a carbon plate is attached to the bridge beam, and a steel fixation port is fixed to both ends of the carbon plate have.

(Patent Document 1) KR10-042657 B1, "Reinforcement method of a horizontal insertion type structure"

(Patent Document 2) KR10-2003-0081910 A, "Reinforcing method of a carbon plate using a steel material fixture formed with a shear key"

In Korean Patent No. 10-0426257, since the concrete structure itself must be damaged, the structural strength of the concrete structure often becomes a problem.

In Korean Patent Laid-Open Publication No. 10-2003-0081910, a steel fixation port is used for preventing early detachment of both ends of the carbon plate by shear force. Such a steel fixation fixture is oxidized (rusted) due to the external environment There is a problem in durability, and in order to fix it to the bridge beam, there is a problem that the deterioration of the bridge beam is accelerated because the bolt groove is formed in the bridge beam and the bolt must be connected.

Particularly, in order to generate fixing force for fixing both ends of the carbon plate, it is necessary to maintain a certain thickness. In this case, there is a problem in that it takes much time and expense to add the construction process because additional process for inserting another reinforcement material between the steel fixture and the carbon plate has to be added.

In order to solve the above-mentioned problems, a reinforcing method of a concrete structure in which a reinforcing sheet is anchored to a reinforcing plate of a carbon fiber according to the present invention is applied to a reinforcing plate of a carbon fiber, The purpose of the present invention is to improve the reinforcing ability by utilizing all the inherent physical properties.

Another object of the present invention is to provide a carbon fiber reinforced sheet which is more flexible for anchoring both ends of a carbon fiber reinforced plate than a carbon fiber reinforced plate and improves the ease of installation and strengthening the strength of the construction .

Another object of the present invention is to improve the adhesion strength, water resistance, and chemical resistance of an epoxy resin adhesive component impregnated with a carbon fiber reinforced sheet to improve the mechanical strength of the concrete structure itself .

The present invention relates to a carbon fiber reinforced plate having a high elastic modulus and a tensile strength property, which can reinforce a concrete structure to enhance the strength of the reinforced concrete. In particular, By anchoring using a carbon fiber reinforced sheet impregnated with epoxy having high flexibility in coefficient and tensile strength, it is possible to reinforce utilizing the physical properties possessed by the carbon fiber reinforced plate as much as possible.

In addition, when the both ends of the carbon fiber reinforcing plate are fixed by applying the flexible and thin carbon fiber reinforced sheet, it is not necessary to post-process the concrete structure, and the reinforcing performance can be improved due to no lifting phenomenon and rust.

In addition, when the concrete structure is reinforced by using the carbon fiber reinforced plate, the reinforcing plate of the carbon fiber is formed to have a longer length at the point where the shear force generated at the concrete structure becomes 0 (zero), so that the reinforcement of the concrete structure can be further enhanced.

In addition, it is a useful invention to increase the adhesion of the carbon fiber reinforced plate by using an epoxy coating device capable of forming more adhesive at the central portion when applying the adhesive to the carbon fiber reinforced plate.

1 is a photograph showing a surface treatment process in the present invention.
2 is a photograph of FIG. 1 taken at different angles; FIG.
3 is a photograph showing a carbon fiber reinforcing plate position marking in the present invention.
4 is a photograph of cutting the carbon fiber reinforcing plate in the present invention.
5 is a state view showing a state in which a shearing force acts in the present invention.
Fig. 6 is a photograph of applying an epoxy adhesive to the surface of the carbon fiber reinforcing plate in the present invention. Fig.
7 is a perspective view showing an adhesive applying device according to the present invention.
8 is a front view of Fig.
9 is a photograph showing a carbon fiber reinforced plate according to the present invention attached to a concrete structure.
10 is a photograph showing a carbon fiber reinforced plate adhered to a concrete structure in the present invention.
11 is an enlarged view showing part A of Fig.

Hereinafter, the reinforcement method of the present invention will be described in more detail with reference to the accompanying drawings.

The present invention relates to a method for reinforcing a concrete structure to be reinforced, comprising the steps of: carrying out a load-bearing capacity measurement and reinforcing operation of the concrete structure to be reinforced, surface treating the concrete structure attachment surface, marking a position for installing a carbon fiber- A step of applying an adhesive to the plate, a step of attaching the carbon fiber reinforcing plate, and a step of attaching the carbon fiber reinforcing sheet.

First, it is checked whether there is a load bearing capacity for the concrete structure to be reinforced, and if the load capacity is insufficient, it is checked whether the concrete structure to be reinforced is reinforced This is the step of performing the operation.

That is, in the case where the adhesion surface of the concrete structure to be reinforced is remarkably deteriorated, even when the carbon fiber reinforced plate is attached to the concrete structure using the adhesive (E), the adhesion force between the carbon fiber reinforced plate and the concrete structure becomes low, It is difficult to expect the desired reinforcing ability of the design.

Therefore, investigation of load bearing capacity on the concrete structure attachment surface is essential.

The load-bearing capacity of the concrete structure is first visually inspected by the naked eye, and if there is a necessity of secondary irradiation, the adhesion strength is measured using a pull-off test. If it is less than 1.5 N / ㎟, reinforcement work should be carried out after removing the deterioration part.

Next, the surface treatment step is a step of forming irregularities to increase the adhesive force while smoothly performing flattening of the surface of the attachment surface of the concrete structure in which the adhesion strength measurement and the adhesion surface maintenance work steps are completed, through sandblasting or grinding At this time, the generated dust can be collected by using a separate dust collecting means to improve the working environment.

Of course, high pressure washing may also be performed to remove fine dust remaining on the attachment surface of the concrete structure during the sandblasting or riding operation (see FIGS. 1 to 2).

Next, in the step of marking the position of the carbon fiber reinforced plate, the position is marked by using an ordinary feeder thread to attach the carbon fiber reinforced plate to the precise position of the concrete structure attachment surface to be reinforced. 3)

Next, the adhesive applying step is a step of applying the adhesive (E) to the carbon fiber reinforcing plate to be adhered to the attachment surface of the concrete structure using the adhesive applying device (10).

In order to carry out this step, it is necessary to first cut the carbon fiber reinforced plate wound on the roll to the concrete surface to be reinforced (see FIG. 4).

The reason for reinforcement of the concrete structure is to prevent the damage due to the shear force and the tensile force generated in the concrete structure due to the load applied to the concrete structure and the concrete structure by the external force

In particular, the moment generated in the concrete structure can be represented by a downwardly projecting moment curve. As shown in FIG. 5, a moment curve curved downwardly protrudes from the upper surface of the concrete structure At both points touching the sides, the moment is zero (zero) theoretically, and the interval between them is the reinforcing section of the carbon fiber reinforced plate by design.

However, the zero point in design is the boundary point between the section of the concrete structure where the moment occurs and the section where no moment occurs, and the point at which the concrete structure under the zero A tensile force is generated, and the tensile force is constantly maintained at this portion.

Therefore, in the present invention, the carbon fiber reinforcing plate is attached to the length of 200-300 mm longer than the actual tensile force. Of course, the extended length is formed at both ends of the carbon fiber reinforced plate, and the actual length is preferably 400 to 600 mm longer than the length of the section where the tensile force is generated.

The above-mentioned carbon fiber reinforced plate can be manufactured by S & P Co., Ltd. located in Switzerland. At this time, the carbon fiber reinforced plate has an elastic modulus of 205,000 N / mm 2 and a tensile strength of 2,400 to 2,600 N / The S & P CFK 200/2000 with an adhesive strength of 1.5 N / ㎟ or a modulus of elasticity of 165,000 N / ㎟ and a tensile strength of 2,700 ~ 3,000 N / ㎟ on the adhesion surface of concrete structures, The reinforcing ability of the carbon fiber reinforced plate can be transferred to the concrete structure as designed only by using one of the model name S & P CFK 150/2000 having the adhesion strength of the concrete matrix of 1.5 N / mm 2.

As described above, the carbon fiber reinforced plate cut in the above manner is not manufactured according to the reinforcing length, but the already prepared carbon fiber reinforced plate is packed and stored in the form of a roll, and then cut to a proper size according to the reinforcement length .

At this time, the carbon fiber reinforced plate is contaminated when it is stored, moved, and cut. The foreign matter acts as a cause of deterioration of adhesion force when the carbon fiber reinforced plate is attached to the surface of the concrete structure.

Therefore, in the present invention, after the cutting of the carbon fiber reinforced plate, the surface of the carbon fiber reinforced plate contacting the concrete structure is cleaned by using the solvent, and then the adhesive is applied to the surface of the carbon fiber reinforced plate .

On the other hand, as for the construction of the adhesive applying apparatus 10 described above,

The first and second side plates 12 and 13 are disposed on both sides of the upper side of the lower plate 11 with a predetermined gap therebetween, .

The upper rear surface of the lower plate 11 is opened, and the front plate 14 is formed on the upper front surface.

Therefore, on the upper side of the lower plate 11, an adhesive receiving groove 15 capable of receiving a semi-solid adhesive by the first and second side plates 12 and 13 and the front plate 14 is formed.

In addition, a rounded height adjustment groove 14a is formed at the lower end of the front plate 14 so that the cross section becomes narrower from the center to both edges.

The height adjustment groove 14a allows a large amount of the adhesive E to be applied to the center portion of the adhesive agent applying device 10 when the adhesive agent E is coated on the surface of the carbon fiber reinforcing plate 10, Of the adhesive (E).

That is, when the carbon fiber reinforced plate coated with the adhesive (E) is adhered to the concrete structure, the center portion is usually firstly pressed first and then the side is pressed to completely adhere. When the adhesive is applied in the same amount, (E) detaches from the carbon fiber reinforcing plate and is buried or falls on the concrete structure, thereby deteriorating the workability and the consumption of the adhesive (E) is increased. In the present invention, (E) can be applied so as to reduce the consumption amount of the adhesive (E) and to minimize the amount of the adhesive (E) deviating from the carbon fiber reinforcing plate.

The first side plate 12 of the adhesive applicator 10 is fixedly coupled to the lower plate 11 and the second side plate 13 is formed with a width adjusting portion 16, The distance between the first and second side plates 12 and 13, that is, the width of the adhesive storage groove 15 can be adjusted according to the width of the fiber reinforced plate.

That is, the width adjusting unit 16 is coupled to the second side plate 13 formed on the adhesive applicator 10 and has a width adjusting bolt B1 And a first frame 16b which is coupled to the lower side of the lower plate 11 and includes a movable groove h1 in the form of a rail on the inner side, The width adjusting bolt B1 is engaged with the groove h1 so that the width adjusting bar 16a combined with the second side plate 13 is moved and fixed so that the width of the adhesive storing groove 15 can be adjusted.

Here, the width adjusting bar 16a and the first frame 16b of the width adjusting part 16 may be formed at one or more positions.

The height and center adjuster 17 may be formed in the adhesive applicator 10 to adjust the height of the front plate 14 so that the amount of the adhesive E applied may be adjusted according to the thickness and size of the carbon fiber reinforcing plate .

That is, one side of the height and center adjuster 17 is formed on the front surface of the front plate 14 by being coupled by the width adjusting bar 16a of the width adjuster 16 and the center adjusting bolt B3 And a second frame 17a having a height fixing bolt B2 formed at a position where it abuts against the front plate 14. A plurality of The position of the front plate 14 can be adjusted and fixed by locking and unlocking the height fixing bolt B2 and the height adjusting hole h2 of the height adjusting bolt B2 can be fixed by using the center adjusting bolt B3, The center of the height adjustment groove 14a formed in the round shape of the front plate 14 can be aligned with the center of the carbon fiber reinforcing plate by varying the position of the frame 17a.

The second frame 17a of the height and center adjuster 17 is connected to the first frame 16b of the width adjuster 16 adjacent to the front plate 14 of the at least one width adjuster 16. [ As shown in FIG.

The effect of applying the adhesive (E) to the carbon fiber reinforced plate using the adhesive applying apparatus 10 having the above-described structure will be described below.

First, the carbon fiber reinforcing plate is inserted into the back surface of the adhesive applicator 10 and placed in the adhesive storage groove 15.

At this time, after the width fixing bolts B2 formed on the width adjusting portion 16 of the adhesive applying device 10 are unlocked, the width adjusting bar 16a and the connecting portion The width fixing bolt B1 formed on the width adjusting bar 16a moves along the movable groove h1 formed in the first frame 16b The distance between the first and second side plates 12 and 13, that is, the width of the adhesive storage groove 15 is adjusted in accordance with the width of the carbon fiber reinforcing plate.

When the width of the adhesive receiving groove 15 is adjusted, the width fixing bolts B2 are tightened to be locked.

Then, the width fixing bolt B2 is fixed in the movable groove h1 of the first frame 16b, so that the width is fixed.

On the other hand, when the width adjustment is completed, the height and the center adjuster 17 are used to adjust the amount of the adhesive E applied to the surface of the carbon fiber reinforcing plate.

That is, the height and center adjuster 17 may be configured to be movable in a state of unlocking the height fixing bolt B2 that can be engaged with any one of the plurality of height adjusting holes h2 formed in the front plate 14 The height of the front plate 14 is adjusted and then fixed to the height adjusting hole h2 formed on the front plate 14 by using the height fixing bolt B2.

The second frame 17a formed on the height and center adjuster 17 and the first frame 16b of the width adjuster 16 are aligned with each other according to the adjustment of the width adjuster 16. [ The adjustment bolt B3 is unlocked to fix the center of the rounded height adjustment groove 14a of the front plate 14 to the center of the carbon fiber reinforcing plate.

After the setting of the adhesive applicator 10 is completed as described above, a semi-solid adhesive (E) is placed on the surface of the carbon fiber reinforcing plate stored in the adhesive storage groove 15, and then the carbon fiber reinforcing plate Direction.

Then, the semi-solid adhesive (E) disposed on the carbon fiber reinforcing plate is applied to the surface of the carbon fiber reinforcing plate to move. At this time, the carbon fiber reinforcing plate is moved along the front plate So that a certain amount of the adhesive E can be applied by the height adjusting groove 14a.

In general, when attaching a carbon fiber reinforced plate for reinforcement of a concrete structure, the center portion of the carbon fiber reinforced plate is pressed first, and both sides are pressed while the carbon fiber reinforced plate is adhered to the concrete structure. Finally, Respectively.

When the amount of the adhesive (E) applied to the center portion and both edges of the carbon fiber reinforced plate is the same, the adhesive (E) applied to the center portion is pushed to both sides and the adhesive (E) is less than the amount of the adhesive (E) on both edge portions, and the adhesive force is lowered. In addition, the adhesive (E) pushed at the center portion and the adhesive E are combined, a large amount of the adhesive E is formed, and a part of the adhesive E thus formed is detached from the carbon fiber reinforcing plate and buried or falls on the concrete structure, It may lead to waste of the adhesive (E).

Accordingly, in the present invention, the height adjustment groove 14a is formed in a round shape having a smaller cross-sectional area from the center to both edges, so that a large amount of the adhesive agent E is applied to the central portion of the carbon fiber reinforcing plate, So that a small amount of the adhesive (E) is applied to both sides, thereby solving the above-mentioned problems.

Next, the step of attaching the carbon fiber reinforced plate is a step of attaching the carbon fiber reinforced plate coated with the adhesive to the concrete structure at the marking position by attaching it to the concrete structure using a compression roller (see FIGS. 9 to 10) .

Next, in the step of attaching the carbon fiber reinforced sheet, the carbon fiber reinforced plate is attached to the concrete structure as described above, and then the carbon fiber reinforced sheet is bonded to both ends of the carbon fiber reinforced plate where early dropping may occur.

That is, as described above, when a concrete structure is reinforced by using a carbon fiber reinforced plate as in the present invention, a shear force and a tensile force are generated due to a load due to self weight and external force, Both ends of the plate are dropped first by the shear force and tensile force of the concrete structure.

Such detachment of the carbon fiber reinforcing plate prevents 100% of the physical properties of the carbon fiber reinforcing plate from being exerted. In the present invention, the step of anchoring both ends of the carbon fiber reinforcing plate using a carbon fiber reinforcing sheet This problem has been solved by adding.

Here, the carbon fiber-reinforced sheet has higher physical properties than the carbon fiber reinforced plate.

(T = 0.10 to 0.13 mm) or 300 g / m < 2 > (t = 0.161 to 0.169 mm) Thereby preventing the fall of the reinforcing plate at both ends.

Particularly, since the carbon fiber-reinforced sheet described above is impregnated with an epoxy resin adhesive and does not form a groove in the concrete structure when anchoring both ends of the carbon fiber reinforcing plate, it is possible to prevent deterioration of the concrete structure And it is made of a nonmetallic material. Therefore, it is advantageous in that oxidation due to environmental factors does not occur, and it has more physical properties than a carbon fiber reinforced plate, so that it is possible to prevent both ends of the carbon fiber reinforced plate from falling off stably.

The carbon fiber-reinforced sheet is composed of a plurality of carbon fiber yarns. The length of the carbon fiber-reinforced sheet is 300 to 400 mm x 200 to 300 mm .

More specifically, the entire length of the carbon fiber reinforcing plate can be covered with an epoxy-impregnated one-side sheet having a length of 300 to 400 mm in the direction in which the fiber yarns are extended and a length of 200 to 300 mm in the direction perpendicular to the fiber yarn extending direction It is preferable to arrange the carbon fiber reinforcing sheet so that the fiber yarn of the carbon fiber reinforcing sheet extends in a direction perpendicular to the longitudinal direction of the carbon fiber reinforcing plate so as to sufficiently cope with the shear force and tensile force generated in the concrete structure.

Particularly, since the carbon fiber-reinforced sheet is light and flexible in thickness and weight, lifting of the ends of the carbon fiber reinforcing plate at anchoring does not occur.

As described above, the carbon fiber-reinforced sheet is impregnated with an epoxy resin adhesive, wherein the epoxy resin adhesive is a two-pack type room temperature curing adhesive in which the base and the curing agent are mixed at a weight ratio of 2: 1.

1. Topic

The subject matter includes 30 to 40% by weight of diglycidyl ether of bisphonol A, 1 to 10% by weight of Silica Furm, 55 to 65% by weight of Silica Flour, 0.8% by weight.

The bisphenol A diglycidyl ether is an epoxy resin having a high heat distortion temperature and a high glass transition temperature so that it is free from deformation and excellent in strength and workability. In particular, an affinity with a carbon fiber-reinforced sheet made of carbon fibers is high, and an effect of improving the adhesiveness can be obtained.

When the amount of the bisphenol A diglycidyl ether is less than the critical value, there is a problem that the adhesiveness is deteriorated. When the content exceeds the critical value, the content of the silica fume and the silica ply to be described later is lowered so that the mechanical properties such as compressive strength and bending strength Can be lowered.

Next, silica fume is fine silica particles obtained by collecting and filtering silicon dioxide (SiO ₂ ) contained in waste gas generated in the production of silicon (Si), ferrosilicon (FeSi), silicon alloy and the like with a dust collector.

The above silica fume adjusts the viscosity of the subject and when the carbon fiber reinforced sheet is adhered to the concrete structure, the pores and the discontinuous areas between the cements constituting the concrete structure are filled to improve the water resistance and chemical resistance through the fine filling effect Therefore, it is possible to further improve the adhesion between the carbon fiber-reinforced sheet impregnated with the epoxy resin adhesive and the concrete structure.

Particularly, the effect of improving the strength of the contact surface of the concrete structure abutting the carbon fiber reinforced sheet due to the pozzolanic reaction with the calcium hydroxide which occurs upon hydration of the concrete structure made of cement can be obtained.

When the silica fume is mixed below the critical value, the viscosity adjustment and the fine filling effect can not be obtained. If the silica fume is exceeded, the viscosity becomes high, and the workability is lowered and the content of bisphenol A diglycidyl ether is relatively decreased There is a problem that the adhesive force is lowered.

Next, the silica flower is a fine powder obtained by crushing silica, having a particle size of 80 to 325 mesh and containing 99.5% of silica. These silica flowers are used as fillers.

If the silica flower is below the critical value, it can not function as a filler. If the silica flower is exceeded, the stability of the epoxy resin adhesive becomes problematic.

Next, in the present invention, a white pigment is added to the subject.

2. Hardener

The curing agent is preferably selected from the group consisting of 20 to 30 wt% of polyamidoamine, 1 to 10 wt% of tertiary amine, 1 to 10 wt% of silica fume, 60 to 70 wt% of silica flower, 0.1 to 0.2% by weight.

First, polyimidoamine is used as a curing agent in the present invention, and improves adhesion and flexibility with silica fume and silica flower, and delays reaction to extend working time, thereby facilitating field workability. Such polyamide-amides are excellent in adhesiveness, water resistance and impact resistance.

If the polyamide-amine is below the critical value, mechanical properties of the epoxy resin adhesive due to lack of adhesion and flexibility of the epoxy resin adhesive are lowered, so that reliability of anchoring of both ends of the carbon fiber reinforcing plate through the carbon fiber reinforcing sheet can not be secured, If it exceeds the critical value, there is a fear that the workability due to the delay of the curing time when mixed with the base becomes poor and the chemical resistance is lowered.

Next, tertiary amines are used as curing accelerators.

The silica fume adjusts the viscosity of the curing agent, and when the carbon fiber-reinforced sheet is adhered to the concrete structure, voids and discontinuities between the cements constituting the concrete structure are filled to improve the water resistance and chemical resistance Therefore, it is possible to further improve the adhesion between the carbon fiber-reinforced sheet impregnated with the epoxy resin adhesive and the concrete structure.

Next, the curing agent further contains a black pigment.

The black pigment is mixed with the white pigment contained in the subject, and serves to allow the user to visually confirm the agitation state of the subject and the curing agent.

As described above, the epoxy resin adhesive composed of a main component and a curing agent has excellent mechanical properties, water resistance and chemical resistance when it is attached to a carbon fiber reinforced plate attached to a concrete structure in a state impregnated with a carbon fiber reinforced sheet, It is possible to obtain an effect of increasing the strength of the contact surface and increasing the adhesion strength of the concrete structure itself.

As described above, according to the reinforcing method of the present invention, since the inherent physical properties of the carbon fiber reinforced plate are 100% demonstrated by using the carbon fiber reinforced sheet, the reinforced concrete structure is excellent, It is possible to obtain an effect of improving the reinforcing ability by eliminating the factor causing further deterioration of the concrete structure during anchoring.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10: Adhesive application device
11:
12: first side plate
13: second side plate
14: front plate 14a: height adjustment groove
15: Adhesive storage groove
16:
16a: width adjusting bar 16b: first frame h1: movable groove B1: width fixing bolt
17: height and center adjuster
17a: second frame h2: height adjustment hole
B2: height fixing bolt B3: center adjusting portion

Claims

It is investigated whether the bond strength of the concrete structure body to be reinforced with carbon fiber reinforced plate is more than 1.5N / ㎟. When the bond strength of the concrete structure body is less than 1.5N / ㎟, And a bonding strength measurement step for performing a reinforcing operation and a mounting surface repairing step;
A surface treatment step of sandblasting or grinding the surface of the carbon fiber reinforced plate of the concrete structure after the adhesion strength measurement and the repairing of the adhesion surface, and simultaneously cleaning the adhesion surface using the dust collecting means to form the surface roughness;
A marking step of marking the carbon fiber reinforcing plate at the precise position to which the carbon fiber reinforcing plate is to be attached after the surface treatment step, using marking;
The carbon fiber reinforcing plate to be attached to the attachment surface of the concrete structure is cut to a required length and the adhesion surface of the carbon fiber reinforced plate is removed by using an adhesive applying device for applying epoxy after removing the foreign substances on the attachment surface contacting the concrete structure An adhesive applying step of applying an adhesive;
Attaching the carbon fiber reinforcing plate coated with the adhesive to the concrete structure where the marking is performed, and then bonding the carbon fiber reinforcing plate using a pressing roller;
A step of attaching a carbon fiber reinforced sheet to the carbon fiber reinforced sheet attached to the concrete structure to prevent early detachment of both ends of the carbon fiber reinforced plate attached to the concrete structure;
The carbon fiber reinforced plate in the step of applying the adhesive has an elastic modulus of 205,000 N / mm 2 and a tensile strength of 2,400 to 2,600 N / mm 2. The adhesion strength of the concrete base on the adhesion surface of the concrete structure is 1.5 N / A tensile strength of 2,700 to 3,000 N / mm < 2 >, and an adhesion strength of the concrete matrix on the adhesion surface of the concrete structure is 1.5 N / mm < 2 & The fiber-reinforced sheet had a modulus of elasticity of 240,000 N / mm 2, a tensile strength of 3,800 N / mm 2, a unit weight and a thickness of 200 g / m 2 (t = 0.10 to 0.13 mm) or 300 g / m 2 (t = 0.161 to 0.169 mm)
In the step of attaching the carbon fiber-reinforced sheet, the carbon fiber-reinforced sheet may contain 30 to 40% by weight of diglycidyl ether of bisphonol A, 1 to 10% by weight of silica fume, silica flour, (A), 55 to 65% by weight of a white pigment and 0.1 to 0.8% by weight of a white pigment, 20 to 30% by weight of a polyamidoamine, 1 to 10% by weight of a tertiary amine and 1 to 10 of a silica fume Characterized in that it is impregnated with an epoxy resin adhesive prepared by mixing a curing agent consisting of 60 to 70% by weight of silica powder, 60 to 70% by weight of silica flower and 0.1 to 0.2% by weight of a black pigment in a weight ratio of 2: 1, Wherein the carbon fiber reinforced sheet is anchored to the carbon fiber reinforced sheet to reinforce the reinforced concrete structure.

The adhesive applying apparatus according to claim 1, wherein the adhesive agent applying device in the adhesive applying step is configured to adjust the distance between the bottom plate contacting the carbon fiber reinforcing plate and the first side plate fixed to the side face and the first side plate, A second side plate connected to the at least one width adjusting unit so as to be adjustable so as to be movable left and right, and a height adjusting groove formed in a round shape such that the rear surface is open and the amount of adhesive applied decreases from the center toward both edges Wherein the reinforcing plate is anchored to the carbon fiber reinforcing plate by an adhesive holding groove capable of receiving an adhesive in a semi-solid state by the front plate on which the reinforcing plate is formed.

The carbon fiber reinforced plate according to claim 2, wherein the front plate of the adhesive applicator has a height and a height for adjusting the center of the carbon fiber reinforcing plate while moving the front plate upward and downward, A method for reinforcing a concrete structure in which a carbon fiber reinforced sheet is anchored to a carbon fiber reinforced plate characterized in that the amount of the adhesive is adjusted.

The apparatus of claim 2, wherein the width adjusting portion formed in the adhesive applicator comprises a width adjusting bar having one side connected to the second side plate and the other side coupled with a width fixing bolt, Wherein the frame is coupled to the bottom plate and the width fixing bolts are coupled to the movable grooves. The height and center adjusters formed on the adhesive applicator are coupled by the first frame and the center adjusting bolt, A carbon fiber reinforced sheet that is anchored to a carbon fiber reinforced plate having a plurality of height adjusting holes corresponding to height fixing bolts formed on a second frame including a height fixing bolt and a height fixing bolt formed on the front plate, Method of reinforcing a structure.

The method of claim 1, wherein the length of the carbon fiber reinforced plate in the adhesive applying step is 200 to 300 mm longer than the point at which the moment generated in the concrete structure is zero. A method of reinforcing a concrete structure by anchoring a carbon fiber reinforced sheet to a plate.

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The carbon fiber-reinforced sheet according to claim 1, wherein the carbon fiber-reinforced sheet has a length of 300 to 400 mm in the direction in which the fiber yarns are extended, and a length of 200 to 300 mm in the direction perpendicular to the direction in which the fiber yarns are extended. Wherein the carbon fiber reinforcing sheet is attached so as to cover both ends of the carbon fiber reinforcing plate with a single directional sheet so that the fiber yarn of the carbon fiber reinforcing sheet is extended in a direction perpendicular to the longitudinal direction of the carbon fiber reinforcing plate. Wherein the carbon fiber reinforced sheet is anchored to the carbon fiber reinforced sheet to reinforce the reinforced concrete structure.

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