KR100791360B1 - Hybrid fiber composite and reinforcing concrete structure using hybrid fiber composite - Google Patents

Abstract

A hybrid fiber reinforcement and a reinforcing method of a concrete structure using the same are provided to prevent sudden brittleness and to increase ductility by placing first reinforcing parts made of a carbon fiber or an aramid fiber, and a glass fiber, and second reinforcing parts made of a glass fiber. First reinforcing parts(311) having 1:5~10 of a volume ratio between a carbon fiber(311a) or an aramid fiber(311c) and a glass fiber(311b) are woven along the width direction in series. Second reinforcing parts(112), which are made of a glass fiber, are woven with a perpendicular direction to the first reinforcing parts in series to form the hybrid fiber reinforcement with a sheet shape. Third reinforcing parts(430) and fourth reinforcing parts(440) are arranged to + 45° of the first reinforcing part and to - 45° of the second reinforcing part respectively.

Description

Hybrid fiber stiffener and reinforcing method of concrete structure using same {Hybrid fiber composite and Reinforcing concrete structure using hybrid fiber composite}

1 is a perspective view showing a state in which a conventional fiber reinforcement is combined to reinforce a concrete structure,

2 is a graph showing the stress-strain of the conventional reinforcing bar and fiber reinforcement used to reinforce the concrete structure,

3 is a plan view showing a sheet-like hybrid fiber reinforcement according to the first embodiment of the present invention,

Figure 4 is a table showing the stress and strain of the glass fiber and carbon fiber of Figure 3,

5 is a perspective view illustrating a state in which the hybrid fiber reinforcement of FIG. 3 is attached to a reinforcement portion of a concrete structure,

Figure 6 is a table showing the type of test specimen for determining the optimum ratio of the hybrid fiber reinforcing materials mixed with various ratios of carbon fiber and glass fiber,

7 and 8 are graphs showing test results of H-alt. 4-2 and H-alt. 5-2, respectively, of the test body of FIG. 6;

9 is a plan view showing a sheet-like hybrid fiber reinforcement according to a second embodiment of the present invention,

10 is a plan view showing a sheet-like hybrid fiber reinforcement according to a third embodiment of the present invention,

11 is a graph showing the stress-strain of the hybrid fiber reinforcement of Figure 10,

12 is a plan view showing a sheet-like hybrid fiber reinforcement according to a fourth embodiment of the present invention,

13 is a view showing a method of reinforcing a concrete structure using a sheet-shaped hybrid fiber reinforcement according to the first to fourth embodiments of the present invention,

14 is a cross-sectional view showing a bar-shaped hybrid fiber reinforcing material according to a fifth embodiment of the present invention,

15 is a cross-sectional view showing a bar-shaped hybrid fiber reinforcing material according to a sixth embodiment of the present invention,

16 is a cross-sectional view showing a bar-shaped hybrid fiber reinforcing material according to a seventh embodiment of the present invention,

FIG. 17 is a perspective view illustrating a first reinforcing method of fixing a bar-shaped hybrid fiber reinforcement material to a concrete structure according to the fifth to seventh embodiments of the present invention.

FIG. 18 is a diagram illustrating the first reinforcing method of FIG. 17 step by step;

19 is a perspective view illustrating a second reinforcing method of fixing a bar-shaped hybrid fiber reinforcement material according to the fifth to seventh embodiments of the present invention to a concrete structure,

20 is a view illustrating the second reinforcement method of FIG. 19 step by step;

FIG. 21 is a perspective view illustrating a third reinforcing method of fixing a bar-shaped hybrid fiber reinforcement material to a concrete structure according to the fifth to seventh embodiments of the present invention.

FIG. 22 is a diagram illustrating the third reinforcement method of FIG. 21 step by step;

23 and 24 (a) and (b) is a bottom surface showing a state in which the bar-shaped hybrid fiber stiffener according to the fifth embodiment of the present invention is fixed to two places and three places each with an adhesive body and a hitch anchor; Degree,

25 is a list of test subjects used in the tests of FIGS. 23 and 24,

(A), (b) and (c) of FIG. 26 are graphs showing the compressive strength of the concrete structure, the repair mortar, and the hybrid fiber reinforcement used in the tests of FIGS. 23 to 24, respectively.

FIG. 27 is a table illustrating test results of FIGS. 23 and 24.

FIG. 28 is a graph showing the test result of FIG. 27. FIG.

* Explanation of symbols for the main parts of the drawings

103: concrete structure

110 ~ 410: sheet fiber hybrid fiber stiffener

111, 211, 311: first reinforcement 112: second reinforcement

430: third reinforcement 440: fourth reinforcement

510 ~ 710: bar-shaped hybrid fiber stiffener

830 anchor

The present invention relates to a hybrid fiber stiffener and a reinforcement method of a concrete structure using the same, and more particularly, a hybrid fiber stiffener and a concrete structure using the same to increase the load capacity of the deteriorated concrete structure to improve the performance of the concrete structure It relates to the reinforcement method of.

In general, concrete is composed of cement, coarse aggregate, fine aggregate, admixture, and the like, unlike other construction materials (reinforcing bars), the composition of the material varies, and different heterogeneous physical properties are combined. Therefore, the quality of concrete is closely related to the quality of constituent materials and depends on the mixing ratio, casting method and curing method.

High-quality concrete has been used for construction and civil engineering materials for a long time because it is economical and semi-permanent. However, when the concrete is produced and used with low quality, or when the concrete structure is exposed to the harsh external environment, the concrete is rapidly damaged.

On the other hand, as the shape of concrete structures is diversified and complicated recently, more loads are applied than the original design loads, and thus often the strength of concrete structures needs to be improved, especially in the case of bridges. As vehicles become larger in size, a structure that can withstand heavy vehicles is required, so the need for performance improvement is urgently needed.

In order to solve this problem, in the past, many reinforcement methods were mainly used, but due to the weight of the steel plate, the weight of the steel plate increased the self-weight of the concrete structure, and corrosion caused over time, resulting in unsightly appearance and environmental pollution. Had been the cause.

Therefore, in order to solve the above problem, a reinforcing method using a fiber sheet (glass fiber, aramid fiber, carbon fiber, etc.), which is light in weight and has no risk of corrosion, has been applied in recent years.

That is, according to Figure 1, the fiber sheet reinforcing material 10 made of a single fiber (any one of glass fiber, aramid fiber, carbon fiber, etc.) by using the adhesive (5) to the reinforcement portion of the concrete structure (3) I attach it.

However, the conventional fibrous sheet reinforcing material 10, unlike the reinforcing bar, as shown in Figure 2, behaves linearly, the strain is extremely limited to cause brittle fracture. Due to the properties of these materials, when the load is excessively acting on the concrete structure 3, there is a problem that is rapidly broken and the stability of the concrete structure 3 is sharply lowered.

Accordingly, an object of the present invention is not only to achieve a reduction in weight by using fibers that are lighter than rebar, but also to manufacture two or more fibers at an appropriate ratio to prevent sudden brittle fracture due to linear behavior, thereby increasing ductility. It is to provide a reinforcing method of the fiber reinforcement and concrete structures using the same.

According to the present invention, in the hybrid fiber reinforcement provided in the concrete structure to reinforce the concrete structure, the first reinforcing portion having a volume ratio of carbon fiber or aramid fiber and glass fiber in the range of 1: 5 to 10 along the width direction Woven in a row, a second reinforcement made of glass fibers is achieved by weaving in a row in a direction orthogonal to the first reinforcement to produce a sheet. Here, the volume ratio of the carbon fiber and the glass fiber is more preferably 1: 9. And a third reinforcement part which is woven on one side of the first reinforcement part facing the second reinforcement part and arranged in the directions of +45 degrees and -45 degrees respectively of the first reinforcement part and the second reinforcement part; It is preferable to include a 4th reinforcement part. At this time, the third reinforcement portion and the fourth reinforcement portion is made of glass fiber.

In addition, according to the present invention, in the hybrid fiber reinforcing material provided in the concrete structure to reinforce the concrete structure, the first reinforcing portion having a volume ratio of carbon fibers and aramid fibers of 1: 1 to 1 in a line along the width direction Woven, a second reinforcement part made of glass fibers is achieved by being woven in a line in a direction orthogonal to the first reinforcement part to be manufactured in a sheet shape. Here, the third reinforcing portion is woven on one side of the first reinforcing portion facing the second reinforcing portion, the first reinforcing portion and the second reinforcing portion arranged in the direction of +45 degrees, -45 degrees, respectively; and Preferably, a fourth reinforcement part is included, and the third reinforcement part and the fourth reinforcement part are made of glass fibers.

And, the above object, according to the present invention, in the hybrid fiber reinforcing material provided in the concrete structure to reinforce the concrete structure, the first reinforcement of the volume ratio of carbon fiber, glass fiber and aramid fiber 1: 5 to 10: 1-3 It is achieved by weaving in a line along the width direction of the addition, and forming a sheet shape by weaving a second reinforcement part made of glass fibers in a line in a direction orthogonal to the first reinforcement part. Here, the third reinforcing portion is woven on one side of the first reinforcing portion facing the second reinforcing portion, the first reinforcing portion and the second reinforcing portion arranged in the direction of +45 degrees, -45 degrees, respectively; and It includes a fourth reinforcement, wherein the third reinforcement and the fourth reinforcement is preferably made of glass fiber.

On the other hand, according to the present invention, in the hybrid fiber reinforcing material provided in the concrete structure to reinforce the concrete structure, the volume ratio of carbon fiber or aramid fiber and glass fiber is provided in the range of 1: 5 to 10, the carbon fiber Alternatively, the aramid fibers are provided on both sides of the glass fibers disposed in the central portion, and is achieved by the epoxy, which is one times the volume of the fibers, is impregnated into the fibers and manufactured in a bar shape. Here, it is preferable that grooves having a predetermined depth are formed at intervals of 2 to 5 mm in the plate surface along the longitudinal direction, so that the repair mortar is filled into the grooves when filling the repair mortar to increase the bonding force with the concrete structure.

And, the object is, according to the present invention, in the hybrid fiber reinforcing material provided in the concrete structure to reinforce the concrete structure, the volume ratio of carbon fibers and aramid fibers is provided in the range of 1: 1 to 3, the volume of the fibers 1 Bain epoxy is achieved by impregnating the fibers into a bar shape. Here, it is preferable that grooves having a predetermined depth are formed at intervals of 2 to 5 mm in the plate surface along the longitudinal direction, so that the repair mortar is filled into the grooves when filling the repair mortar to increase the bonding force with the concrete structure.

In addition, according to the present invention, in the hybrid fiber reinforcing material provided in the concrete structure to reinforce the concrete structure, the volume ratio of carbon fiber, glass fiber and aramid fiber is provided in the range of 1: 5 to 10: 1-3 , The carbon fiber is provided on both sides of the glass fiber and the aramid fiber, it is achieved by the epoxy is impregnated into the fibers to be a bar shape of 1 times the volume of the fibers. Here, it is preferable that grooves having a predetermined depth are formed at intervals of 2 to 5 mm in the plate surface along the longitudinal direction, so that the repair mortar is filled into the grooves when filling the repair mortar to increase the bonding force with the concrete structure.

The object is, according to another field of the present invention, the step of chipping (chipping) the reinforcement of the concrete structure; Preparing a hybrid fiber stiffener made of a sheet shape in accordance with the area of the reinforcement portion of the concrete structure; And affixing the hybrid fiber reinforcement to a reinforcement portion of the chipped concrete structure via a predetermined amount of epoxy. At this time, the volume of the epoxy is preferably one to two times the volume of the hybrid fiber reinforcement.

The object is, according to another field of the present invention, the step of chipping (chipping) the reinforcement of the concrete structure; Providing a plurality of hybrid fiber stiffeners manufactured in a bar shape according to areas of reinforcement portions of the concrete structure; Forming an anchor hole in the hybrid fiber stiffener using a drill; Disposing the hybrid fiber reinforcement material in the axial direction on the reinforcement portion of the concrete structure; Fixing the hybrid fiber reinforcement to the reinforcement portion of the concrete structure by striking an anchor to the anchor hole by using a hitting tool; The hybrid fiber reinforcement is achieved by the step of filling the repair mortar to the reinforcement portion of the concrete structure is fixed.

The object is, according to another field of the present invention, the step of chipping (chipping) the reinforcement of the concrete structure; Providing a plurality of hybrid fiber stiffeners manufactured in a bar shape according to areas of reinforcement portions of the concrete structure; Making the hybrid fiber reinforcement to be perpendicular to each other to form a lattice, and then forming an anchor hole at an overlapping portion using a drill; Fixing the hybrid fiber reinforcing material of the lattice type to the reinforcement part of the concrete structure by striking an anchor to the anchor hole by using a striking tool; The hybrid fiber reinforcement is achieved by the step of filling the repair mortar to the reinforcement portion of the concrete structure is fixed.

The object is, according to another field of the present invention, the step of chipping (chipping) the reinforcement of the concrete structure; Providing a plurality of hybrid fiber stiffeners manufactured in a bar shape according to the area of the reinforcement portion of the concrete structure; Bonding the overlapping portions so that the hybrid fiber reinforcement materials are orthogonal to each other in a lattice shape, and forming an anchor hole in the hybrid fiber reinforcement material in contact with the concrete structure using a drill; Fixing the hybrid fiber reinforcing material of the lattice type to the reinforcement part of the concrete structure by striking an anchor to the anchor hole by using a striking tool; The hybrid fiber reinforcement is achieved by the step of filling the repair mortar to the reinforcement portion of the concrete structure is fixed.

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

Prior to the description, in various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, only the configuration different from the first embodiment will be described.

Hybrid fiber reinforcing material according to the present invention can be largely produced in two types, one is to be produced in a sheet shape (first embodiment to the fourth embodiment) described with reference to FIGS. And a bar shape (fifth to seventh embodiments) described with reference to FIGS. 14 to 28. In addition, the reinforcement method of the concrete structure using the hybrid fiber reinforcement is also made to meet the characteristics according to the sheet shape or bar shape.

(1) First, a sheet-shaped hybrid fiber stiffener and a method of reinforcing concrete structures using the same will be described.

The hybrid fiber reinforcement 110 according to the first embodiment of the present invention is provided in two axes consisting of a first reinforcement 111 and a second reinforcement 112 orthogonal to each other.

The first reinforcing portion 111 is a carbon fiber 111a and a glass fiber 111b are woven in a line along the width direction, wherein the volume ratio of the carbon fiber (111a) and the glass fiber (111b) is 1: 5 ~ 10 to be. At this time, the first reinforcing portions 111 are connected to each other by a connecting member 113 such as a thread. In the first embodiment, only the case where the first reinforcement portion 111 is composed of carbon fibers 111a and glass fibers 111b, the first reinforcement portion 111 is composed of carbon fibers and aramid fibers, and The volume ratio may be made of 1: 5 to 10, which is the same ratio as that of glass fiber.

The second reinforcement part 112 is woven in a line in a direction orthogonal to the first reinforcement part 111, and the second reinforcement part 112 functions not only to connect the first reinforcement part 111, Together with the first reinforcement portion 111 serves to ensure ductility. At this time, the second reinforcement 112 is made of inexpensive glass fiber.

As shown in FIG. 4, the physical properties of the carbon fiber 111a and the glass fiber 111b used in the first reinforcement part 111 and the second reinforcement part 112 are the stresses of the glass fiber 111b. Tensile strength) is approximately 792 MPa, the strain is 1.76%, the stress (tensile strength) of the carbon fiber 111a is 1,283 MPa, and the strain is about 1.13%.

In order to derive the optimum ratio 1: 5 to 10, wherein the carbon fibers 111a and the glass fibers 111b having such physical properties have the maximum ductility, various test specimens as shown in FIG. Attached to (103), the flexural load test was performed. At this time, the beam which is the concrete structure 103 used about 90 mm in width, 100 mm in height, and about 800 mm in length. As a result of the bending test, according to FIG. 6, the maximum load (Pmax) of the hybrid fiber (carbon fiber (C) + glass fiber (G)) is much higher than that of a test body composed of a single fiber (carbon fiber (C) or glass fiber (G) only). When the volume ratio of the carbon fiber 111a and the glass fiber 111b was about 1: 5 to 10, the ductility effect was improved as shown in Figs. -alt.4-2 is shown, and FIG. 8 shows a case of H-alt.5-2 in the test body, and the softening effect is higher when H-alt.5-2 than H-alt.4-2. That is, in Fig. 7, the strain by the glass fiber 111b is a maximum of 1.35% at 8.5kN load, the strain by the glass fiber 111b is up to 1.4% at 8.5kN load in Figure 8 Since it is high, the volume ratio 1: 9 of carbon fiber (C) and glass fiber (G) of H-alt.5-2 will be more preferable in ensuring high ductility.

As a result of the test, unlike the conventional brittle fracture made of a single fiber, in the case of the present invention, the carbon fiber 111a and glass fiber 111b having different stresses (tensile strength) are mixed to have high rigidity carbon fiber ( The 111a) resists the tension and then breaks at a constant strain rate, and then the glass fiber 111b resists the tension instead of the carbon fiber 111a, thereby securing high ductility. That is, the hybrid fiber reinforcement 110 according to the present invention to ensure a similar ductile behavior, such as reinforcing bars, to secure the properties of high strength + intermediate ductility to reinforce the concrete structure 103 of a large area such as walls, slabs to ensure safety Can be. Therefore, it is lighter than rebars and can be reduced in weight, and can be applied to concrete structures 103 requiring high ductility, such as seismic reinforcement, through ductile behavior similar to that of rebars.

Meanwhile, in the hybrid fiber reinforcement 110 of the first embodiment, although the first reinforcement part 111 and the second reinforcement part 112 are provided in two axes orthogonal to each other, as in the fourth embodiment shown in FIG. The third reinforcement portion (see 430 of FIG. 12) and the fourth reinforcement portion (see 440 of FIG. 12) are further formed in the +45 and −45 degrees directions of the first reinforcement 111 and the second reinforcement 112, respectively. It is preferable to provide a shear force.

As described above, in the first embodiment, the hybrid fiber reinforcement 110 is made of carbon fiber 111a and glass fiber 111b, but may be variously configured as in the second to fourth embodiments. Of course.

In the second embodiment, as shown in FIG. 9, the first reinforcing portion 211 of the hybrid fiber reinforcement 210 is made of carbon fibers 211a and aramid fibers 211c and the second reinforcing portion 112. It may be made of glass fiber. In the second embodiment, the volume ratio of the carbon fibers 211a and the aramid fibers 211c is composed of 1: 1 to 3, and is woven in a line along the width direction, and the second reinforcement 112 is the first reinforcement 211. ) Is provided to be orthogonal to the first reinforcement 211 to improve the ductility effect together with the first reinforcement 211. In this case, the third reinforcement part (see 430 of FIG. 12) and the fourth reinforcement part (440 of FIG. 12) in the +45 degree and -45 degree directions of the first reinforcement part 211 and the second reinforcement part 112, respectively. It is preferable to provide a further) to reinforce the shear force.

 In the third embodiment, as shown in FIG. 10, the first reinforcement 311 of the hybrid fiber reinforcement 310 is woven from carbon fiber 311a, glass fiber 311b, and aramid fiber 311c, and The second reinforcement part 112 is made of glass fiber and connects the first reinforcement part 311 by being perpendicular to the first reinforcement part 311. Here, the volume ratio of the carbon fiber 311a, the glass fiber 311b, and the aramid fiber 311c, which are the first reinforcing parts 311, is 1: 5 to 10: 1 to 3. As such, when the first reinforcing portion 311 is composed of three fibers, as shown in FIG. 11, the carbon fiber 311a, the aramid fiber 311c, and the glass fiber 311b are sequentially broken in high strength + high By achieving ductile behavior, it will be more suitable for structures requiring high ductility, such as seismic reinforcement.

On the other hand, as shown in Figure 12, the hybrid fiber reinforcement 110 of the fourth embodiment is the third reinforcement in the +45 degree, -45 degree direction of the first reinforcing portion 111 and the second reinforcing portion 112, respectively The portion 430 and the fourth reinforcement 440 may be further disposed to secure the ductility in the shear direction to reinforce the concrete structure 103.

A method of reinforcing the concrete structure 103 using the sheet-shaped hybrid reinforcing members 110 to 410 of the first to fourth embodiments described above will be briefly described with reference to FIG. 13.

First, chipping the reinforcement portion of the concrete structure 103 using a grinder (S1). This step is for the hybrid fiber reinforcement (110 ~ 410) is to be well adhered to the concrete structure 103, of course, it is also possible to further add the operation to smooth the surface by washing the reinforcement with water or the like.

Next, the hybrid fiber reinforcement (110 ~ 410) of the sheet shape is cut to fit the area of the reinforcement portion of the concrete structure (103) (S2).

Finally, after applying epoxy (not shown) to the reinforcement portion of the concrete structure 103, the hybrid fiber reinforcement (110 ~ 410) is adhered to the reinforcement portion of the concrete structure 103 to complete the reinforcement (S3) . Here, the optimal volume of the epoxy used is 1 to 2 times the volume of the hybrid fiber reinforcement (110 ~ 410) is sufficient. Thereafter, the top coating agent or the like may be applied to a predetermined thickness, and reinforcement or aesthetically necessary steps may be further added.

(2) Hereinafter, a bar-shaped hybrid fiber reinforcement and a method of reinforcing the concrete structure 103 will be described.

The hybrid fiber stiffeners 510 to 710 illustrated in FIGS. 14 to 16 illustrate cross sections of the hybrid fiber stiffeners 510 to 710 formed of a combination of two or more fibers.

The hybrid fiber reinforcement 510 of the fifth embodiment shown in FIG. 14 has a volume ratio of 1: 5 to 10 of the carbon fiber 511 and the glass fiber 512, and is prepared by using epoxy to bind the fibers. (Not shown) is impregnated and manufactured. The bar-shaped hybrid fiber stiffener 510 is made of a volume ratio of the fibers (511, 512) and the epoxy is 1: 1, 10 to 100mm in width, 1 to 10mm in height.

Carbon fiber 511 is provided on both sides of the glass fiber 512 disposed in the center, because the lower cost by applying a plurality of inexpensive glass fiber 512 in the center and the carbon fiber 511 on both sides Can produce products. On the other hand, in general, since the anchor 830 (see FIG. 17) installation portion becomes the center portion of the hybrid fiber stiffener 510 of the fifth embodiment, the economical efficiency of the hybrid fiber stiffener 510 by using an inexpensive glass fiber 512 in the center portion It can be maximized.

At this time, it is preferable that a groove 510a of about 0.2 to 2 mm is formed long along the longitudinal direction at one side surface of the hybrid fiber reinforcement 510 at intervals of 2 to 5 mm. Thus, after fixing the hybrid fiber reinforcement 510 to the concrete structure 103 using the anchor 830, when reconstructing the concrete structure 103 and the hybrid fiber reinforcement 110 with a repair mortar (not shown), By filling the repair mortar into the groove 510a, the bonding force between the concrete structure 103 and the hybrid fiber reinforcement 110 may be improved.

Here, instead of glass fiber may be manufactured in place of aramid fiber, in this case, the volume ratio of carbon fiber and aramid fiber is not only provided in the range of 1: 1 to 3, but also the volume ratio of the impregnated epoxy is the same as the fifth embodiment Since other configurations are also the same, a description thereof will be omitted.

On the other hand, the hybrid fiber reinforcement 610 of the sixth embodiment shown in Figure 15 is produced by providing a volume ratio of 1: 1 to 3 of the carbon fiber 611 and aramid fiber 613, wherein the fibers (611, Epoxy (not shown) is impregnated to fabricate 613. At this time, the volume ratio of the fibers (611, 613) and the epoxy is made of 1: 1, as in the fifth embodiment, the width 10 ~ 100mm, the height is produced 1 ~ 10mm.

In addition, it is preferable that a groove 610a having a length of about 0.2 to 2 mm is formed along the longitudinal direction at one side of the plate surface of the hybrid fiber stiffener 610 of the sixth embodiment at intervals of 2 to 5 mm. Thus, after fixing the hybrid fiber reinforcement 110 to the concrete structure 103 using the anchor 830, when reassessing the concrete structure 103 and the hybrid fiber reinforcement 110 with a repair mortar, the groove 610a As the repair mortar is filled in, the bonding force between the concrete structure 103 and the hybrid fiber reinforcement 610 may be improved.

16 is a cross-sectional view of the hybrid fiber stiffener 710 of the seventh embodiment, unlike the hybrid fiber stiffeners 510 and 610 of the fifth and sixth embodiment consisting of two fibers, three fibers, that is, carbon fiber 711, aramid fiber 713, there is a difference in that the glass fiber 712.

In the hybrid fiber stiffener 710 of the seventh embodiment, the volume ratio of the carbon fiber 711 and the glass fiber 712 and the aramid fiber 713 is provided in 1: 5 to 10: 1 to 3, wherein the fibers Epoxy (not shown) is impregnated to fabricate 711, 712, 713. Hybrid fiber stiffener 710 of the seventh embodiment is made of a volume ratio of the fibers (711, 712, 713) and epoxy of 1: 1, and is made of a width of 10 ~ 100mm, a height of 1 ~ 10mm.

In the hybrid fiber stiffener 710 in the seventh embodiment, the carbon fiber 711 is provided on both sides, the aramid fiber 713 and the glass fiber 712 is composed of a structure arranged inside the carbon fiber 711 However, the arrangement of the fibers 711, 712, 713 is not limited thereto and may be variously configured. However, in general, the fabrics 711, 712, and 713 are disposed and manufactured so that the anchor holes 800a to 800c may be formed in the glass fiber 713 in consideration of the positions where the anchor holes 800a to 800c are formed. As a result, the glass fibers 712, which are relatively inexpensive as compared with the carbon fibers 711 and the aramid fibers 713, may be lost when the anchor holes 800a to 800c are formed, thereby securing economical efficiency.

In addition, as in the fifth and sixth embodiments, grooves 710a having a length of about 0.2 to 2 mm are formed long along the longitudinal direction at intervals of 2 to 5 mm on one side surface of the hybrid fiber stiffener 710 of the seventh embodiment. It is preferable. Thus, after fixing the hybrid fiber reinforcement 710 to the concrete structure 103 using the anchor 830, when reassessing the concrete structure 103 and the hybrid fiber reinforcement 710 with a repair mortar, the groove 710a As the repair mortar is filled in, the bonding force between the concrete structure 103 and the hybrid fiber reinforcement 710 may be improved.

Hereinafter, the bar-shaped hybrid fiber stiffeners 510, 610, and 710 of the fifth embodiment to the seventh embodiment (510 ′, 610 ′, 710 ′), 510 ″, 610 ″, 710 ″, 510 510. Three methods for reinforcing the concrete structure 103 using '' ', 610' '', 710 '' 'will be briefly described. Here, prime (') is the same fiber reinforcement produced on the same principle as (510, 610, 710), was used for convenience in explaining each reinforcement method.

17 and 18 are views showing a first reinforcement method.

First, chipping the reinforcement portion of the concrete structure 103 using a grinder (S11). This step is to ensure that the hybrid fiber reinforcement (510, 610, 710) is well fixed to the concrete structure 103, of course, it is possible to further add to the smooth surface by washing the reinforcement with water or the like.

Next, after cutting the plurality of hybrid fiber stiffeners (510, 610, 710) to fit the area of the reinforcement portion of the concrete structure 103 (S12), the anchor hole 800a by using a drill in the required portion of the anchor hole (800a) ) Is formed (S13).

Thereafter, the hybrid fiber reinforcement (510, 610, 710) having the anchor hole (800a) is arranged in one axial direction to contact the concrete structure (103) (S14), the anchor using the impact tool (850) 830 hits the anchor hole (800a) to fix the hybrid fiber reinforcement (510, 610, 710) to the reinforcement portion of the concrete structure 103 (S15).

Finally, the reinforcement is completed by filling the repair mortar in the reinforcement portion of the concrete structure 103 so that the hybrid fiber reinforcement (510, 610, 710) is sufficiently fixed to the concrete structure 103 (S16). At this time, the repair mortar uses a polymer mortar, after which a top coating agent or the like may be applied to a predetermined thickness, and reinforcement or aesthetically necessary steps may be further added.

19 and 20 are views showing a second reinforcement method.

The second reinforcement method is different from the first reinforcement method in which the hybrid fiber reinforcement materials 510, 610, and 710 are fixed to the concrete structure 103 in the uniaxial direction. , 710 ') is orthogonal to each other in the concrete structure 103, and is fixed in the biaxial direction.

First, chipping the reinforcement portion of the concrete structure 103 by using a grinder (S21). This step is for the hybrid fiber stiffeners (510, 610, 710) (510 ', 610', 710 ') to be well fixed to the concrete structure 103, the work to smooth the surface by washing the reinforcement with water or the like Of course, you can add more.

Next, the bar-shaped hybrid fiber stiffeners (510, 610, 710) (510 ', 610', 710 ') is cut to fit the area of the reinforcement site of the concrete structure 103, at this time is prepared to be a grid (S22) ).

Thereafter, the hybrid fiber reinforcing materials (510, 610, 710) (510 ', 610', 710 ') are overlapped so as to be orthogonal to each other, an anchor hole (800b) is formed in the overlapping portion using a drill (S23). Thus, by hitting the anchor 830 to the anchor hole 800b by using the hammering tool 850, the hybrid fiber reinforcement 110 made of a lattice shape is fixed to the reinforcement portion of the concrete structure 103 (S24). .

Finally, the repairing mortar is filled in the reinforcement portion of the concrete structure 103 so that the hybrid fiber reinforcement materials 510, 610, 710 (510 ′, 610 ′, 710 ′) are sufficiently fixed and coupled to the concrete structure 103. To complete the reinforcement (S25). Thereafter, the top coating agent or the like may be applied to a predetermined thickness, and reinforcement or aesthetically necessary steps may be further added.

21 and 22 are views showing a third reinforcement method.

The third reinforcement method is to make the hybrid fiber reinforcement (510 '', 610 '', 710 '') (510 '' ', 610' '', 710 '' ') into a grid to reinforce the concrete structure 103 It is the same as the second reinforcement method in that it is fixed in the second reinforcement method, but in the second reinforcement method, lattice-type hybrid fiber reinforcement materials (510 '', 610 '', 710 '') '') Is coupled by the anchor 830 when the anchor 830 is fixed to the concrete structure 103, but in the third reinforcement method, hybrid fiber stiffeners (510 '', 610 '', 710 '') ( 510 '' ', 610' '', 710 '' '), the hybrid fiber reinforcement (510' ', 610' ', 710'), which is pre-bonded with epoxy and then in contact with the concrete structure 103 when lattice-shaped There is a difference in that ') is fixed to the reinforcement portion of the concrete structure 103.

First, chipping of the reinforcement portion of the concrete structure 103 using a grinder (S31). This step is to ensure that the hybrid fiber reinforcement (510 '', 610 '', 710 '') (510 '' ', 610' '', 710 '' ') is well fixed to the concrete structure 103, Of course, it is possible to add more to smooth the surface by washing the site with water or the like.

Next, by cutting a plurality of hybrid fiber stiffeners (510 '', 610 '', 710 '') (510 '' ', 610' '', 710 '' 'to the area of the reinforced portion of the concrete structure 103 Prepare (S32).

Thereafter, the overlapping portions of the hybrid fiber reinforcement materials 510 '', 610 '', 710 '' (510 '' ', 610' '', 710 '' ') are orthogonal to each other to form a lattice shape. After bonding to the), using the drill to form an anchor hole (800c) in the hybrid fiber reinforcement (510 ", 610", 710 ") in contact with the concrete structure 103 (S33).

And, by hitting the anchor 830 to the anchor hole (800c) using the blow tool 850, the grid-like hybrid fiber reinforcement (510 '', 610 '', 710 '') (510 '' ', 610 '' ', 710' '') is fixed to the reinforcement part of the concrete structure 103 (S34).

Finally, the hybrid fiber reinforcement (510 '', 610 '', 710 '') (510 '' ', 610' '', 710 '' ') is concrete enough to be fixed to the concrete structure 103 to be combined Filling the reinforcement portion of the structure 103 to the repair mortar to complete the reinforcement (S35). Thereafter, the top coating agent or the like may be applied to a predetermined thickness, and reinforcement or aesthetically necessary steps may be further added.

As such, one of the characteristics of the present invention is to apply a hybrid fiber reinforcement (510, 610, 710) having a good ductility effect by using an anchor 830 instead of the adhesive or clip and bolt method hybrid fiber reinforcement (510, 610, By fixing the 710, the strength of the concrete structure 103 is increased because a lot of holes must be drilled in the concrete structure 103 in order to fix the clip to the concrete structure 103 with bolts or bolts due to the problem of adhesion deterioration when the adhesive is used. This is to solve the problem of deterioration.

Hereinafter, the bar-shaped hybrid fiber reinforcement (510, 610, 710) to form a lattice, as shown in Figs. 23 and 24, two places on the concrete structure 103 with an adhesive (not shown), anchor 830 Or to fix each of the three places to perform a stress-strain test in the P direction to find the usefulness of the anchoring method 830 according to the present invention.

23 (a) and 23 (b) show a state in which the hybrid fiber reinforcement material (see specimens C2, C3, and FIG. 25) is fixed in a lattice form with an adhesive and then fixed in two places and three places with an adhesive to the concrete structure 103, respectively. 24 (a) and (b) show a state in which the anchor 830 is fixed to a portion where the hybrid fiber stiffener (experiments H2, H3, see FIG. 25) overlap by applying the second reinforcement method. will be. In order to test the strain according to the load (stress), after fixing the specimens as shown in Figs. 23 and 24 to the concrete structure 103, after filling the reinforcement with a repair mortar (using a polymer mortar) in the P direction Tensile tests were performed respectively.

A detailed table of the test specimen is shown in FIG. 25, and the test results for the strength of the concrete structure 103, the repair mortar (not shown), and the grid (fiber stiffeners 510, 610, and 710) used in the test are shown in FIG. 25. As shown in 26. That is, the test was carried out using the compressive strength of the concrete structure 103 18.4MPa, the repair mortar compressive strength 51.6MPa, the grid tensile strength of 1975MPa.

As a result, the same results as in FIG. 27 were obtained. According to FIG. 27, when the number of fixing is large regardless of the fixing method (adhesive or anchor), the tensile stress (or the maximum strength) increases when the test piece is deformed. Could.

In addition, according to FIG. 28, the increase / decrease ratio according to the tensile stress was found to be generally higher when the number of fixings in each fixing method (adhesive, anchor) was large, and the increase / decrease ratio was higher than the hitting anchor method than the adhesive. appear.

As described above, according to the present invention, the hybrid fiber reinforcement (510, 610, 710) having good ductility by performing brittle fracture of multiple stages, and by applying the same to reinforce the concrete structure 103 by the impact anchor reinforcement method, the maximum ductility Since it can ensure the safety of the concrete structure 103 can be maximized.

Of the embodiments described above, the dimensions indicated in the sheet-shaped hybrid fiber reinforcement is not limited thereto and may be changed as necessary.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit and scope of the present invention. It will be apparent to those skilled in the art that such modifications belong to the claims of the present invention. .

As described above, according to the present invention, it is possible to increase the ductility by preventing the brittle fracture due to the linear behavior by not only reducing the weight by using the fiber lighter than the reinforcement, but also by manufacturing two or more fibers at an appropriate ratio. Hybrid fiber stiffeners and concrete structures using the same are provided.

Claims (15)

In the hybrid fiber reinforcement provided in the concrete structure to reinforce the concrete structure, The first reinforcement having a volume ratio of carbon fiber or aramid fiber and glass fiber in the range of 1: 5 to 10 is woven in a line along the width direction, and the second reinforcement made of glass fiber is orthogonal to the first reinforcement. Hybrid fiber stiffener, characterized in that the woven in a row to produce a sheet (sheet) shape. In the hybrid fiber reinforcement provided in the concrete structure to reinforce the concrete structure, The first reinforcement having a volume ratio of carbon fibers and aramid fibers in the range of 1: 1 to 3 is woven in a line along the width direction, and the second reinforcement made of glass fibers is woven in a line perpendicular to the first reinforcement. Hybrid fiber stiffener, characterized in that the sheet (sheet) is manufactured in the form. In the hybrid fiber reinforcement provided in the concrete structure to reinforce the concrete structure, A first reinforcing part having a volume ratio of carbon fiber, glass fiber and aramid fiber in a range of 1: 5 to 10: 1 to 3 is woven in a line along the width direction, and a second reinforcing part made of glass fiber Hybrid fiber reinforcement, characterized in that the woven in a line in the direction perpendicular to the sheet (sheet). The method according to any one of claims 1 to 3, A third reinforcement part and a fourth weave on one side of the first reinforcement part facing the second reinforcement part and arranged in the directions of +45 degrees and -45 degrees respectively of the first reinforcement part and the second reinforcement part; Hybrid fiber reinforcement comprising a reinforcement. The method of claim 4, wherein The third reinforcement portion and the fourth reinforcement portion is a hybrid fiber reinforcement, characterized in that made of glass fibers. The method of claim 1, The volume ratio of the carbon fiber and the glass fiber is 1: 9 hybrid fiber reinforcing material. In the hybrid fiber reinforcement provided in the concrete structure to reinforce the concrete structure, The volume ratio of carbon fiber or aramid fiber and glass fiber is provided in the range of 1: 5 to 10, the carbon fiber or the aramid fiber is provided on both sides of the glass fiber disposed in the center, Epoxy, which is one-times the volume of the fibers, is impregnated into the fibers to produce a bar shape. In the hybrid fiber reinforcement provided in the concrete structure to reinforce the concrete structure, A volume ratio of carbon fibers and aramid fibers is provided in the range of 1: 1 to 3, and the hybrid fiber reinforcement, characterized in that the epoxy is impregnated into the fibers to be formed in a bar shape (bar) of 1 times the volume of the fibers. In the hybrid fiber reinforcement provided in the concrete structure to reinforce the concrete structure, The volume ratio of carbon fiber, glass fiber and aramid fiber is provided in the range of 1: 5 to 10: 1 to 3, and the carbon fiber is provided on both sides of the glass fiber and the aramid fiber, and the epoxy is one times the volume of the fibers. The hybrid fiber reinforcement is characterized in that the impregnated in the fibers are produced in the shape of a bar. The method according to any one of claims 7 to 9, Hybrid fiber reinforcement, characterized in that the groove of a predetermined depth is formed in the plate surface along the longitudinal direction at 2 to 5mm intervals. Chipping a reinforcing portion of the concrete structure; Comprising the hybrid fiber reinforcement prepared by any one of claims 1 to 3 to the area of the reinforcement portion of the concrete structure; Reinforcing the concrete structure comprising the step of adhering the hybrid fiber reinforcement to the reinforcement portion of the chipped concrete structure via a predetermined amount of epoxy. The method of claim 11, The volume of the epoxy reinforcement method of the concrete structure, characterized in that 1 to 2 times the volume of the hybrid fiber reinforcement. Chipping a reinforcing portion of the concrete structure; Providing a plurality of hybrid fiber stiffeners prepared according to claim 10 according to the area of the reinforcement portion of the concrete structure; Forming an anchor hole in the hybrid fiber stiffener using a drill; Disposing the hybrid fiber reinforcement material in the axial direction on the reinforcement portion of the concrete structure; Fixing the hybrid fiber reinforcement to the reinforcement portion of the concrete structure by striking an anchor to the anchor hole by using a hitting tool; Reinforcing method of the concrete structure comprising the step of filling the repair mortar in the reinforcement portion of the concrete structure is fixed to the hybrid fiber reinforcement. Chipping a reinforcing portion of the concrete structure; Providing a plurality of hybrid fiber stiffeners prepared according to claim 10 according to the area of the reinforcement portion of the concrete structure; Making the hybrid fiber reinforcement to be perpendicular to each other to form a lattice, and then forming an anchor hole at an overlapping portion using a drill; Fixing the hybrid fiber reinforcing material of the lattice type to the reinforcement part of the concrete structure by striking an anchor to the anchor hole by using a striking tool; Reinforcing method of the concrete structure comprising the step of filling the repair mortar in the reinforcement portion of the concrete structure is fixed to the hybrid fiber reinforcement. Chipping a reinforcing portion of the concrete structure; Providing a plurality of hybrid fiber stiffeners prepared according to claim 10 according to the area of the reinforcement portion of the concrete structure; Bonding the overlapping portions of the hybrid fiber reinforcement so that they are orthogonal to each other in a lattice form with epoxy, and forming anchor holes in the hybrid fiber reinforcement in contact with the concrete structure using a drill; Fixing the hybrid fiber reinforcing material of the lattice type to the reinforcement part of the concrete structure by striking an anchor to the anchor hole by using a striking tool; Concrete reinforcement method comprising the step of filling the repair mortar to the reinforcement portion of the concrete structure is fixed to the hybrid fiber reinforcement.

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