KR101790166B1 - Composite Plate Eeinforcement Structure and Construction Method thereof - Google Patents

Abstract

The present invention relates to a composite plate reinforcement structure and a construction method which are implemented to overcome a shortage of strength of a concrete beam by using a reinforcing material composed of aluminum, glass fiber and epoxy material, and a perforated truss structure ; A front end reinforcing portion extending in a direction perpendicular to both sides of the flexural reinforcement portion and having a first clip member formed at one end thereof; And a second clip member which can be fastened to the first clip member of the shear reinforcement part and an additional shear reinforcement part which is fastened to the rigid body together with the shear reinforcement part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite plate reinforcement structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite plate reinforcement structure and a construction method, and more particularly, to a composite plate reinforcement structure and a construction method, which are implemented to overcome a shortage of strength of a concrete beam using a reinforcing material composed of aluminum, glass fiber, will be.

The foundation of modern infrastructure is mostly reinforced concrete (RC). All RC structures are all dynamics considered by the designer to fully perform their functions and are provided to the users with appropriate safety factors according to the circumstances and circumstances.

However, if the structural damage due to unexpected factors or the environmental factors causes the deterioration, it is impossible to fulfill the function of the designed structure. In such a case, the structural safety diagnosis is performed so as to secure the functional range of the structure After repair is done. In addition, if the structure in use has sufficient strength at the time of designing, if the structural strength is to be increased due to the increase in construction due to the structural change or the increase in the working load, reinforcement is again carried out through the structural design.

Reinforcing of RC structure has been used with various materials. Initial repair ㅇ The material used in the reinforcement method is steel. The steel plate reinforcement method is a method of attaching a steel plate to a tensile surface of a concrete structure, and it has been used for a long time since the 1960 's because the bending strength and stiffness enhancement effect of the RC structure can be expected. However, the steel plate reinforcement method has a disadvantage that it is difficult to handle because it uses a steel having a large specific gravity and its weight is large. In addition, adhesion damage to the concrete matrix due to corrosion of steel has been a problem.

In the 1980s, reinforced concrete (FRP), which is superior in mechanical properties, durability and light weight, has been introduced in the repair and reinforcement of RC structures. FRP reinforcement methods have begun to be studied.

Types of FRP include glass fiber, aramid fiber, and carbon fiber. They are used in various reinforcement methods depending on their physical properties. FRP has a great advantage in strength, light weight, corrosion resistance, etc. than other materials, and research on repair and reinforcement using FRP is actively being carried out.

The RC structure reinforced with FRP significantly increased the actual flexural strength, and the stiffness was also increased significantly. In order to maximize the performance of the FRP, which has great merits as a reinforcing material, FRP sheets, FRP plates, FRP NSM (near surface mounted) Etc. have been developed and used.

Older RC structures or RC structures that require reinforcement have been improved in strength through the methods listed above, and these methods are being used as reinforcements for bridges and buildings. However, there are still challenges to be solved.

The Korean Registered Utility Model No. 20-0182826 (Mar. 3, 2000) can be used to increase the rigidity of the facility by applying the pre-plex method which is generally verified and easy to apply, to secure safety, A reinforcing member having a contact portion contacting a central portion of a lower surface of a reinforcing object region of a concrete structure constituting an upper plate of the bridge and being provided at a central portion thereof so as to protrude from both ends; And a tightening means for tightening the reinforcing member at a lower portion of the reinforcing member so as to correct and reinforce the bending of the concrete structure. According to the disclosed technology, since the reinforcing member is disposed at the central portion of the area to be reinforced of the concrete structure so that its central protruding portion is in contact and the both ends are spaced apart and tightened to apply the pre-flexing force, the efficiency of the repairing and reinforcing operation is improved. The rigidity and durability of the structure can be greatly increased since the structure and the stiffener appropriately distribute the load when the dead load and live load are applied to the structure.

Korean Patent No. 10-0259927 (Mar. 29, 2000) discloses that the bent portions of both sides reliably exert an anchor function in the concrete structure, and the concrete, which improves the structural strength and tensile strength of the constructed concrete structure, And a steel fiber for reinforcing a structure. According to the disclosed technology, there are provided a body portion extending horizontally in a straight line at the center, and bending portions at both sides having a horizontal end portion bent horizontally from the end of the inclined bending portion with inclined bending portions on both sides of the body portion Wherein a ratio of lengths of the bent portions on both sides of the tapered portion inclined from the body portion of the horizontal stepped portion parallel to the body portion is 1: 1.1-1: 1.2.

The steel sheet reinforcing method used in the conventional concrete reinforcing structure as described above is a method of attaching a steel plate to a tensile surface of a concrete structure by using epoxy, and it is expected that the bending strength and stiffness enhancing effect of the RC structure can be expected. However, since it is used for a long period of time, it has a disadvantage that it is difficult to handle due to the use of a heavy specific gravity, its weight is large, and adhesion problems with the concrete matrix due to corrosion of steel have been raised.

Korean Registered Utility Model No. 20-0182826 Korean Patent No. 10-0259927

One aspect of the present invention provides a composite plate reinforcing structure and a method of constructing a reinforcing member made of aluminum, glass fiber, and epoxy material, and a clip-type fastening portion is provided to overcome the shortage of strength of the concrete beam.

The technical problem of the present invention is not limited to the technical problems mentioned above, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

A composite plate reinforcement structure according to an embodiment of the present invention includes: a reinforcement portion having a perforated truss structure in a longitudinal direction; A front end reinforcing portion extending in a direction perpendicular to both sides of the flexural reinforcement portion and having a first clip member formed at one end thereof; And a second clip member which can be fastened to the first clip member of the shear reinforcement part and an additional shear reinforcement part which is fastened to the rigid body together with the shear reinforcement part.

In one embodiment, the first clip member may be formed in the shape of "?" Bent inward from one end of the front end reinforcement portion.

In one embodiment, the second clip member may be formed in the "? "Form bent outward from one end of the additional shear reinforcement.

In one embodiment, the second clip member may be inserted into the " ∩ "shaped groove of the first clip member and engaged with the clip.

In one embodiment, the shear reinforcement may be fastened to the rigid body by a portion where the first clip member and the second clip member are engaged.

In one embodiment, the shear reinforcement may seal the open part of one side and then fill the adhesive with the other side to the rigid body.

In one embodiment, the perforated truss structure may be integrally formed or detachably attached to the lower portion of the bending reinforcement.

The composite plate reinforcing structure according to another embodiment of the present invention may further include an additional bending reinforcement for cross-stacking a plurality of layers formed of GFRP (glass fiber reinforced plastic) on the surface of the bending reinforcement to supplement the bobbin strength .

According to still another aspect of the present invention, there is provided a method of reinforcing a composite plate, comprising: applying an adhesive to an upper portion of a flexural reinforcement or a rigid body requiring reinforcement; Attaching the bending reinforcement to the rigid body; And a step of fastening a front end reinforcing portion extending in a direction perpendicular to both sides of the bending reinforcing portion together with the additional front end reinforcing portion to the bobbin rigid body.

In one embodiment, the step of joining the shear reinforcement comprises: sealing one open portion of the shear reinforcement; Filling the space between the front end reinforcement part and the rigid body with adhesive at the other side of the front end reinforcement part; Inserting the additional shear reinforcement into another side of the shear reinforcement to insert the first clip member and the second clip member in a clip-like manner; And a step of fastening the first clip member and the second clip member together at the engaged portion to the rigid body.

According to one aspect of the present invention, there is provided a composite plate reinforcement structure and a construction method using reinforcement made of aluminum, glass fiber, and epoxy material and a clip type fastening part to overcome a shortage of strength of a concrete beam, It has the effect of increasing the strength and stiffness of the beam and compensating for the disadvantages such as ventilation, early dropout, and workability of the existing reinforcement method.

1 and 2 are views for explaining a composite plate reinforcing structure according to an embodiment of the present invention.
3 is a view for explaining the fastening structure of the front end reinforcement portion and the additional shear reinforcement portion.
Fig. 4 is a view showing the reinforcing portion and the shear reinforcement portion shown in Fig. 1. Fig.
5 is a flowchart illustrating a method of constructing a composite plate structure according to another embodiment of the present invention.
FIG. 6 is a flowchart for explaining the step of assembling the shear reinforcement in FIG.
7 and 8 are views showing a test body for evaluating the effect of the composite plate reinforcing structure according to the present invention.
9 is a photograph showing an experimental view for evaluating the effect of the composite plate reinforcing structure.
FIG. 10 is a photograph showing fracture patterns of a pivot rigid body that is not reinforced by the composite plate reinforcing structure of the present invention.
FIG. 11 is a photograph showing the fracture mode of the reinforced rigid body reinforced by the composite plate reinforcing structure of the present invention. FIG.
12 is a graph showing a load-displacement relationship between a rigid body reinforced by the present invention and a rigid rigid body which is not reinforced.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

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

1 and 2 are views for explaining a composite plate reinforcing structure according to an embodiment of the present invention.

Specifically, the composite plate reinforcing structure according to an embodiment of the present invention includes a flexural reinforcement portion 100, a shear reinforcement portion 200, and a short-circuiting steel portion 300.

The bending reinforcement member 100 has a perforated truss structure 110 in the longitudinal direction and is formed with a shear reinforcement 200 in a direction perpendicular to the upper side from both sides and is attached to the bored rigid body, . Herein, the term "reinforced concrete member" refers to a reinforced concrete structure constituting the foundation of most of the modern facilities, but it is not limited to reinforced concrete, but may be other structures that require reinforcement.

In one embodiment, the bending reinforcement 100 is attached to the skin complex after the adhesive is applied to the surface facing the bored rigid body or after the adhesive is applied to the attachment surface of the rigid body to which the bending reinforcement 100 is to be attached, It is possible to reinforce the warping of the skin complex.

In one embodiment, the bending reinforcement 100 can provide the effect of improving the rigidity while reducing its weight by forming the truss structure of the hole.

The shear reinforcement 200 is formed to extend in a direction perpendicular to both sides of the flexural reinforcement 100 and has a first clip member 210 formed at one end thereof to reinforce the front end of the rigid body.

In one embodiment, the shear reinforcement 200 is formed integrally with the flexural reinforcement 100 and is made of an aluminum material, so that the strength and the strength of the shear reinforcement 200 are lower than those of the steel, so that the handling and construction of the reinforcement can be improved.

The additional shear reinforcement 300 has a second clip member 310 at one end which can be fastened to the first clip member 210 of the shear reinforcement 200 and is fastened together with the shear reinforcement 200 (For example, a bolt, an anchor bolt, etc.), and is reinforced with the shear reinforcement 200 in the front end of the rigid body.

The composite plate reinforcing structure having the above-described structure is obtained by using the flexural reinforcement portion 100, the shear reinforcement portion 200 and the short-circuiting steel portion 300 made of aluminum (AL 6063-T5) It can be produced by extrusion processing. At this time, AL 6063-T5 is excellent in formability and corrosion resistance, so that the flexural reinforcement portion 100, the shear reinforcement portion 200, and the short-circuiting steel portion 300 made of AL 6063-T5 are excellent in rigidity , Strength, bending stiffness and strength.

4, unlike the existing reinforcing material, the composite plate reinforcing structure having the above-described structure is formed by extending the shear reinforcement 200 perpendicularly to both ends of the flexural reinforcement 100, And adhesion performance can be improved.

The composite plate reinforcing structure having the above-described construction is characterized in that the end portions of the rigid bodies are attached to both ends of the shear reinforcement 200 for fixing to the rigid bodies so that the shear reinforcement 200 and the concrete matrix The reinforcement performance can be improved by preventing the fracture shape such as peeling of the edge of the shear reinforcement 200 due to the improvement of the adhesion performance by the frictional shear of the shear reinforcement and the stress concentration phenomenon.

The composite plate reinforcing structure having the above-described structure uses a reinforcing material composed of aluminum, glass fiber, and epoxy material, and a clip type fastening portion is provided to overcome the shortage of strength of the concrete beam, thereby increasing the strength and rigidity of the RC beam It is possible to compensate for the disadvantages such as permeability, early dropout, and workability of the existing reinforcement method, and it is possible to reinforce the bending and shear strength at the same time.

2 is a perspective view of a composite plate reinforcement structure according to an embodiment of the present invention.

Referring to FIG. 2, the bending reinforcement member 100 has two through-hole truss structures 110-1 and 110-2 in the longitudinal direction. However, the number of the through-hole trusses 110-1 and 110-2 is not limited to the number of the through- Three or more through-hole truss structures may be formed.

In one embodiment, the perforated truss structure 110 is shown integrally at the lower portion of the flexural reinforcement 100 in the case of FIGS. 1 to 3, but may be formed in a detachable form such as a fastening means, .

3 is a view for explaining the fastening structure of the front end reinforcement portion and the additional shear reinforcement portion.

3, the first clip member 210 is formed in the shape of "∩" bent inward from one end (that is, the upper end of the front end reinforcing portion 200) of the front end reinforcing portion 200, The bent portion of the second clip member 310 is inserted into the space formed by bending.

The second clip member 310 is formed in the shape of "∪" bent outward from one end (that is, the lower end of the additional shear reinforcement 300) of the additional shear reinforcement 300, and the outwardly bent portion And is inserted into the space formed by bending inward of the first clip member (210).

In one embodiment, the second clip member 310 can be inserted into the " ∩ "shaped groove of the first clip member 210 as shown in FIG.

The front end reinforcing portion 200 is formed so that the portion where the first clip member 210 and the second clip member 310 engage is engaged with the rigid body by the fastening means (e.g., bolts, anchor bolts, etc.) Can be fastened together.

In one embodiment, even if there is no separate fastening means in the rigid body, the front end reinforcing portion 200 may be formed by sealing an open portion of one side to be attached to the rigid body, (See FIG. 1).

The composite plate reinforcing structure having the above-described configuration may further include an additional bending reinforcement portion 400. [

The additional flexural reinforcement 400 is formed by alternately stacking a plurality of layers formed of glass fiber reinforced plastic (GFRP) on the surfaces of the flexural reinforcement 100, the shear reinforcement 200, Strength is supplemented (see FIG. 4). In this case, when the fiber arrangement is unidirectional, if a force acts in a direction different from the fiber arrangement direction due to eccentricity or the like, the fiber arrangement is disturbed and the structure performance of the hybrid material can not be fully exhibited. As a result, By having the pattern, the structural performance of the hybrid material can be exerted and the required mechanical properties can be realized.

In one embodiment, the additional flexural reinforcement 400 includes a flexural reinforcement 100 having a relatively low modulus of elasticity, a shear reinforcement 200, and a non-attachable ferroconcrete structure 300, Shear friction can be reduced and the composite behavior can be induced.

The aluminum used in the flexural reinforcement portion 100, the shear reinforcement portion 200, and the short-circuiting steel portion 300 of the present invention can improve the handling and the workability of the reinforcement because the strength is smaller than that of the steel but is lighter. The additional bending reinforcement 400 formed of the bending reinforcement 100 serves to relatively reinforce the low strength aluminum and surrounds the bending reinforcement 100 to improve corrosion resistance and durability. In addition, compared to the reinforcement materials used in existing methods, aluminum and glass fibers with low elastic modulus can induce composite behavior by reducing the shear friction due to non-adhesion with RC structure.

5 is a flowchart illustrating a method of constructing a composite plate structure according to another embodiment of the present invention.

Referring to FIG. 5, first, an adhesive is applied to an upper portion of the flexural reinforcement 100 or a rigid body requiring reinforcement (S510).

In one embodiment, the adhesive applied to the rigid body is a thermosetting resin adhesive having an epoxy adhesive (an epoxy resin, a curing agent, a filler, a diluent, and other additives as a basic base, excellent mechanical properties after curing, , And excellent electrical insulation characteristics) can be used.

When the adhesive is applied in the above-described step S510, the flexural reinforcement 100 is attached to the rigid body as shown in FIG. 1 (S520)

When the bending reinforcement 100 is attached to the bending reinforcement 100 in step S520 as described above, the shear reinforcement 200 extending in the direction perpendicular to both sides of the bending reinforcement 100 is fastened to the rigid body together with the additional shear reinforcement 300. [ (S530).

The method of constructing the composite plate structure having the above-described steps may include a grinding operation on the surface of the pivoted body reinforced by the present invention before the step S510, an operation of removing the finished mortar of the pivoted body, And performing a pre-processing operation to perform at least one of a work of repairing the irregular surface of the rigid body, and a work of flattening the irregular surface of the rigid body. Further, the primer may be applied to the rigid body after the pre-treatment process is performed.

By performing the pretreatment process as described above and applying the primer, the adhesion force between the rigid body and the flexural reinforcement 100 can be increased.

Fig. 6 is a flowchart for explaining the step of assembling the shear reinforcement in Fig.

Referring to FIG. 6, one side of the shear reinforcement 200 is sealed (S531). The first clip member 210 and the second clip member 310 are engaged with each other at one side of the shear reinforcement member 200 so that the rigid body and the shear reinforcement member 200 do not closely contact each other, (See Figs. 1 to 3). By sealing the gap, the adhesive filled from the other side is prevented from flowing out through the gap.

In the case of sealing in the above-described step S531, adhesive is filled in the space between the front end reinforcing portion 200 and the pivot rigid body to the other side of the front end reinforcing portion 200 (S532).

When the adhesive is filled in step S532, the additional shear reinforcement 300 is slid into the other side of the shear reinforcement 200 so that the first clip member 210 and the second clip member 310 are clipped (S533). 3, after the additional shear reinforcement 300 is adjusted so that the first clip member 210 and the second clip member 310 are engaged with each other in the form of a clip, 2, the additional shear reinforcement 300 is fastened to the shear reinforcement 200 by slidingly inserting the additional shear reinforcement 300 so that the additional shear reinforcement 300 can be inserted in the longitudinal direction while being engaged with the member 210. [ .

When the clip is fastened in the above-described step S533, the first clip member 210 and the second clip member 310 are engaged with each other using a fastening means (for example, an anchor bolt or the like) And tightened together with the rigid body (S534).

Figs. 7 to 12 are views for explaining experiments for evaluating the effect of the composite plate reinforcing structure according to the embodiment of the present invention. Fig.

FIG. 7 is a view showing a test body for evaluating the effect of the composite plate reinforcing structure according to the present invention, FIG. 9 is a photograph showing an experimental foreground for evaluating the effect of the composite plate reinforcing structure, FIG. 11 is a photograph showing a fracture mode of a reinforced body reinforced by the composite plate reinforcing structure of the present invention, and FIG. 12 is a photograph showing a fracture surface of a composite plate reinforced structure Fig. 3 is a graph showing the load-displacement relationship between the reinforced rigid body and the unfitted rigid body.

First, to verify the bending and shear reinforcement capability of the composite plate reinforcing structure according to the present invention, an RC beam was manufactured. After that, reinforced with the present invention, bending and shearing tests were performed. The behavioral characteristics of the specimens reinforced by the present invention and the specimens not reinforced are experimentally compared and analyzed through various variable analyzes. The reliability of the specimens was confirmed through a general structure design program, and the behavior of the structures reinforced by the present invention was predicted Respectively.

7 and 8, a total of three specimens including a reference specimen (BU) were fabricated to confirm the reinforcing effect of the beam reinforced by the present invention (BE-2) Details are shown in Fig.

Figure 7 shows a simplified representation of the experimental method. The load capacity of all specimens was displaced 300 mm from both sides of the specimen, and displacement control was performed until the specimen was destroyed at a speed of 0.02 mm / sec. Two linear variable differential transformers (LVDT) were installed at the center of the specimen to measure the displacement of the specimen. In addition, two strain gauges were attached to the center of the reinforcing bars to examine the behavior of each material during the flexural failure test. Seven strain gauges were attached as shown in Fig. All the data were measured by using a data logger until the end of the experiment and the strain of the composite plate stiffener at the center of the specimen and the stiffener of the reinforced bar and the hollow truss were measured at each load step. In addition, the initial cracks and crack progress of the test specimens, and the dropout and fracture of the stiffener of the perforated truss composite plate were visually observed and recorded. The cracks generated at each loading step were recorded on the member side, And the panoramic view of the experiment is shown in the photograph of FIG.

Referring to FIG. 10, the BU specimen is a RC system in which the present invention is not reinforced, and the mechanical mechanism is a system in which the compressive force of the concrete and the tensile force of the reinforcing bar are combined to resist the flexure. In the equilibrium relation between the two forces, It was designed as a rebar. As a result of the load test of the reference specimen, the flexural failure due to the yielding of the steel bar in accordance with the design intent was found. At the initial stage of the test, flexural cracks occurred in the center load zone, and cracks occurred in the center direction in both directions as the load increased. As the load continued to increase, the load did not increase as the rebar yielded, and the center deflection of the specimen was large and the experiment ended with the compression failure of the concrete.

As can be seen from Fig. 10, the final destruction of the B-U specimen can be confirmed.

Referring to FIG. 11, the structural behavior of the specimen reinforced by the present invention is a system in which the tensile force of the present invention is added in addition to the compressive force of the concrete and the tensile force of the tensile reinforcing bar to resist bending. Compared with unreinforced specimens, the tensile strength is increased, which can lead to an increase in flexural strength and rigidity, and can suppress the cracks in the concrete tensile section.

In addition, when the load is loaded, the fracture mode of the test specimen subjected to the flexural reinforcement according to the present invention causes the tensile force to be simultaneously applied to the hybrid material beam and the tensile reinforcement. Then, when the random load is reached, the rebar first surrenders, and soon, a large load is imposed on the perforated truss composite plate stiffener, and the rupture occurs at the maximum flexural section.

As can be seen from FIG. 11, flexural cracks occurred and developed as the displacement increased from the center of the reinforced RC bore of the present invention, and the final fracture was terminated by fracture of the compression portion due to slip between the cast iron and concrete The adhesion between the reinforcement and the concrete is considered to be sufficient.

The cracks of the reference specimen (B-U) (Fig. 10) and the specimen of flexural strengthening specimen (BE-2) (Fig. It can be judged that the specimen reinforced by the present invention suppresses cracking and prevents crack propagation. Further, until the end of the experiment, the fracture of the present invention, which is a reinforcing material, and the separation from RC beams did not occur

Referring to FIG. 12, the initial crack load, stiffness and maximum load of the specimens reinforced by the present invention were increased on the basis of the reference specimen B-U. The initial crack load of the B-U standard specimen was 11.6 kN and the specimen of the reinforced specimen was 18.1 kN. It is believed that the initial crack is restrained by strengthening the tensile part of the concrete. The stiffness of the reference and reinforced specimens did not show any significant difference until the initial crack occurred. However, the stiffness difference after the initial crack appeared, and the maximum load was also significantly increased compared with the reference specimen B-U. In addition, the flexural reinforcement effect can be expected by yielding more ductile section while yielding at higher load than the reference specimen.

As a result, in order to reinforce the flexure, shear strength and rigidity of the present invention, the bending failure test was carried out by attaching the reinforcing plate of the perforated truss composite plate made of the two materials to the tensile portion of the RC beam. For the analysis, failure modes, specimen cracking behavior, effects on experimental parameters, and deformation characteristics of stiffened composite plate stiffeners were investigated. Thus, the following conclusions were obtained.

First, the specimens reinforced by the present invention have increased stiffness and maximum load as compared with the reference specimens without reinforcement. The reinforced specimens showed a maximum load increment of 32.4% ~ 86.2% and 30% of ductility. Therefore, it is judged that the reinforcing performance of the present invention is excellent.

In addition, when the reinforcing effect is considered through the strength, displacement, and crack pattern of the test specimen, the reinforcing according to the present invention is efficient, and the end vertical plate installation for preventing the corners of the concrete edge and improving the adhesion performance is more effective for reinforcing the structure Able to know.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

100:
200: shear reinforcement
210: first clip member
300: additional shear reinforcement
310: second clip member
400: additional bending reinforcement

Claims (15)

A bending reinforcement in which a perforated truss structure is formed in the longitudinal direction;
A front end reinforcing portion extending in a direction perpendicular to both sides of the flexural reinforcement portion and having a first clip member formed at one end thereof; And
And an additional shear reinforcement unit having a second clip member at one end thereof which can be fastened to the first clip member of the shear reinforcement unit and fastened to the rigid body together with the shear reinforcement unit,
Wherein the first clip member is formed in a shape of "?"Bent inward from one end of the front end reinforcing portion.
delete The apparatus of claim 1, wherein the second clip member comprises:
Is formed in a "?" Form bent outward from one end of the additional shear reinforcement.
4. The apparatus of claim 3, wherein the second clip member comprises:
Is inserted into the groove of the "?"Shape of the first clip member and is engaged with the clip in the clip shape.
5. The apparatus according to claim 4, wherein the shear-
And the portion where the first clip member and the second clip member are engaged is fastened together with the rigid body.
6. The apparatus according to claim 5, wherein the shear-
And a fastening means for fastening the engaged portion of the first clip member and the second clip member together with the rigid body.
2. The apparatus according to claim 1, wherein the shear-
Wherein the open portion of one side is sealed and then the adhesive is filled between the other side and the rigid body.
2. The structure of claim 1,
Wherein the reinforcing plate is formed integrally or detachably at a lower portion of the flexural reinforcement.
The method according to claim 1,
Wherein the flexural reinforcement portion, the shear reinforcement portion, and the additional shear reinforcement portion are made of aluminum.
The method according to claim 1,
Further comprising an additional bending reinforcement for reinforcing the bobbin strength by stacking glass fiber reinforced plastic (GFRP) on the surface of the bending reinforcement.
11. The apparatus of claim 10, wherein the additional bending reinforcement comprises:
Wherein a plurality of layers formed of GFRP are cross-laminated.
Applying an adhesive to an upper portion of the bending reinforcement or a rigid body requiring reinforcement;
Attaching the bending reinforcement to the rigid body; And
And a step of fastening a front end reinforcing portion extending in a direction perpendicular to both sides of the bending reinforcing portion to the pivot rigid body together with the additional front end reinforcing portion,
The step of joining the shear reinforcement may include sealing the one open portion of the shear reinforcement; Filling the space between the front end reinforcement part and the rigid body with adhesive at the other side of the front end reinforcement part; Inserting the additional shear reinforcement into another side of the shear reinforcement to insert the first and second clip members in a clip-like manner; And engaging the engaged portion of the first clip member and the second clip member together with the rigid body,
Wherein the first clip member is formed in a shape of "?&Quot; bent inward from one end of the front end strengthening portion.
13. The method of claim 12,
Prior to the step of applying the adhesive, at least one of grinding operation on the surface of the rigid body, removing the mortar of the rigid body, repairing the crack of the rigid body, or planarizing the uneven surface of the rigid body And a pretreatment step of performing a pretreatment of the composite plate structure.
14. The method of claim 13,
Further comprising the step of applying a primer to the rigid body after performing the pretreatment step.
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