JP3806252B2 - Reinforcing method of concrete structure with reinforcing fiber sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for reinforcing a concrete structure, such as a pillar or beam with a wall, or a wall-type pier, which is a building or a civil engineering structure.
[0002]
[Prior art]
Conventionally, as a method of reinforcing a structure such as a concrete pillar constructed by a reinforced concrete (RC) or a steel reinforced concrete (SRC), a concrete pillar has been used. There are a method of winding reinforced concrete around and a method of attaching a steel plate.
[0003]
The method of winding reinforced concrete (RC) has problems such as an increase in weight, a new cross-sectional area, and a long curing period and a long construction period for performing concrete placement on site. The method of affixing a steel plate requires the operations of welding the affixed steel plates together or joining them by bolting, and has a problem that the weight of the steel plate is heavy and workability is poor.
[0004]
Therefore, in recent years, a reinforcing method for winding a carbon fiber sheet around a concrete column has been proposed.
[0005]
That is, as shown in FIG. 7, a continuous long carbon fiber sheet 10 having a width (W _O ) of 20 to 50 cm, which is configured by arranging the carbon fibers f in one direction, is wound around the concrete pillar 100 by a predetermined amount. Each sheet uses a plurality of reinforcing fiber sheets 10 that are wound by the number of pieces or are cut to dimensions of a width (W _O ) of 20 to 50 cm and a length of 1 to 2.5 m, which is shorter than the circumference of the concrete pillar 100. It is carried out by laminating and winding a predetermined number of sheets, if necessary, so as to form a plurality of layers, so that the ends of 10 overlap each other, impregnating the reinforcing fiber sheet 10 with resin, and curing the resin Yes.
[0006]
[Problems to be solved by the invention]
However, for example, as shown in FIG. 8, when reinforcing a column 100 with a wall (sleeve wall) 101, a so-called column with a sleeve wall, the sleeve wall 101 is once broken, and the carbon fiber sheet is formed on the column 100. 10 was continuously wound around the concrete pillar 100 and reinforced, and after the winding, the sleeve wall 101 was restored. Such a reinforcing method is troublesome and has a problem that the construction period becomes long.
[0007]
Accordingly, the reinforcement of the column 100 with the sleeve wall is performed by attaching the carbon fiber sheet 10 to the half of the circumference of the column 100 on both sides of the column 100 divided by the sleeve wall 101 as shown in FIGS. A method is adopted in which the two ends of the carbon fiber sheet 10 are fixed to the pillar 100 with anchor bolts 102, L-shaped angles 103, and the like. Although this method does not require the trouble of breaking and restoring the sleeve wall 101, it requires the processing of the L-shaped angle, and the fixing work of the anchor bolt 102 is complicated, and it takes a lot of work. In addition, the carbon fiber sheet 10 is intermittent on both sides of the column, is not continuous, cannot be wound in a closed shape, and there is a problem in terms of reinforcing effect.
[0008]
The object of the present invention is to provide a reinforcing effect similar to that in the case of winding a continuous reinforcing fiber sheet in a concrete structure such as a column with a sleeve wall and a beam, and the construction is easy and the construction period can be shortened. It is to provide a method for reinforcing a concrete structure with a reinforcing fiber sheet.
[0009]
[Means for Solving the Problems]
The above object is achieved by a method for reinforcing a concrete structure using a reinforcing fiber sheet according to the present invention. In summary, the present invention is a method of reinforcing a pillar part in a concrete structure in which a wall part is integrally formed with the pillar part, comprising:
(A) drilling a through hole in the wall portion connected to the column portion;
(B) a step of attaching a reinforcing fiber sheet to each side of the pillar portion divided by the wall portion; (c) a reinforcing fiber anchor in which a plurality of reinforcing fibers are arranged on the tubular member; Installation process,
(D) injecting resin into the tubular member of the reinforcing fiber anchor, and impregnating the reinforcing fiber with resin;
(E) removing the tubular member within the pot life of the resin;
(F) Both ends of the reinforcing fiber are positioned at each end of the reinforcing fiber sheet, then each end is expanded into a fan shape, and both ends of the reinforcing fiber are bonded to the reinforcing fiber sheet with resin. The process of
(G) a step of curing the resin;
A method for reinforcing a concrete structure, comprising the steps of:
[0010]
According to an embodiment of the present invention, the reinforcing fiber sheet has a support and reinforcing fibers arranged on the support, and the reinforcing fiber anchor is arranged in the tubular member and the tubular member. And reinforcing fiber. The tubular member is a metal or resin pipe.
[0011]
Preferably, the reinforcing fibers are carbon fibers, glass fibers, inorganic fibers including ceramic fibers, aramid fibers, polyethylene fibers, polypropylene fibers, organic fibers including nylon fibers, or metals including titanium fibers, stainless steel fibers, and iron fibers. Fibers can be used singly or as a mixture of a plurality of types, and the resin is a room temperature curable or thermosetting epoxy resin, a polyester resin, a polyamide resin, a polycarbonate resin, or a radical reaction system. It can be a resin.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the concrete structure reinforcing method using the reinforcing fiber sheet according to the present invention will be described in more detail with reference to the drawings. With reference to FIG. 1, the case where the reinforcement method of this invention is applied to the concrete pillar 100 with a sleeve wall by which a cross section is made into a rectangle is demonstrated.
[0013]
According to the present invention, the reinforcing fiber sheet 10 having a predetermined width W, for example, 25 cm, 33 cm, or 50 cm, is provided on both sides of the concrete pillar 100 divided by the sleeve wall 101 in the concrete pillar 100 having the sleeve wall 101. It is affixed in a U shape over almost half the circumference of the concrete pillar 100. The reinforcing fiber sheet 10 is attached at a predetermined pitch P along the longitudinal direction of the concrete pillar 100. Further, the reinforcing fiber sheets 10 on both sides of the concrete pillar 100 are positioned in a corresponding arrangement relationship, that is, on the same circumference. In the embodiment shown in FIG. 1A, W = P, that is, a series of reinforcing fiber sheets 10 on each side are arranged adjacent to each other, but the present invention is not limited to this, and FIG. As shown in (B), W <P, that is, the reinforcing fiber sheets 10 can be arranged apart from each other.
[0014]
The outer peripheral surface of the concrete pillar 100 is preferably subjected to a surface treatment such as applying a primer, and then the reinforcing fiber sheet 10 is pasted with a resin, that is, an adhesive. As the method, for example,
(1) An adhesive is applied to one side or both sides of the reinforcing fiber sheet 10, and the reinforcing fiber sheet 10 is impregnated with the adhesive, and then attached to the outer peripheral surface of the concrete column 100.
(2) An adhesive is applied to the outer surface of the concrete pillar 100, the reinforcing fiber sheet 10 is wound from above, and the reinforcing fiber sheet 10 is impregnated with the adhesive. If necessary, an adhesive is further applied to the surface of the reinforcing fiber sheet 10.
and so on.
[0015]
Thus, the reinforcing fiber sheet 10 affixed to the concrete pillar 100 by the required number of layers hardens the impregnated adhesive by heating as necessary.
[0016]
5 (a) and 5 (b), one example of the reinforcing fiber sheet 10 is shown. The reinforcing fiber f continuous on the support 11 is unidirectionally connected to the support 11 with an adhesive 12, for example. It is formed by arranging.
[0017]
As the support 11, glass cloth, glass paper (nonwoven fabric), aramid fiber cloth, aramid nonwoven fabric or the like is used. The thickness (t ₁ ) of the support 11 is _{1 to} 500 μm, preferably 5 to 100 μm, and the thickness (t ₂ ) of the adhesive 12 is 1 to 100 μm, preferably 10 to 30 μm.
[0018]
The reinforcing fiber sheet 10 has an overall thickness (T) of 0.05 to 5 mm and a width (W) of 2 to 100 cm, for example, 25 cm, 33 cm, and 50 cm as described above.
[0019]
As the reinforcing fibers f, carbon fibers are suitable, and PAN fibers, pitch fibers, and the like can be used. Reinforcing fiber f is not limited to carbon fiber, but also includes glass fiber, inorganic fiber including ceramic fiber, aramid fiber, polyethylene fiber, polypropylene fiber, organic fiber including nylon fiber, titanium fiber, stainless steel Steel fibers, metal fibers including iron fibers, and the like can also be used. If necessary, a plurality of such fibers can be mixed and used as a hybrid type.
[0020]
Regarding the physical properties of the reinforcing fiber f, the elastic modulus is preferably 0.3 × 10 ⁶ kgf / cm ² or more and 5.0 × 10 ⁶ kgf / cm ² or less.
[0021]
As the adhesive applied to the reinforcing fiber sheet 10, that is, the matrix resin impregnated into the reinforcing fiber f, a thermosetting resin such as a room temperature curing type or a thermosetting type epoxy resin, a polyester resin, or the like, if desired. In addition, thermoplastic resins such as polyamide resin and polycarbonate resin, and radical reaction resins such as MMA resin can be used.
[0022]
At this time, the reinforcing fiber volume content of the reinforcing fiber sheet 10 impregnated with the adhesive (resin), that is, (volume of reinforcing fiber f) / (volume of reinforcing fiber f + volume of adhesive impregnated) × 100. (%) Is 10% (volume) or more and 70% (volume) or less. When the reinforcing fiber content is less than 10% (volume), the thickness (T) of the reinforcing fiber sheet 10 for securing the necessary fiber amount becomes thick.
[0023]
According to the present invention, as can be better understood with reference also to FIGS. 3 and 4, the sleeve wall 101 portion has a diameter of 10 to 30 mm corresponding to the reinforcing fiber sheet 10 affixed to the concrete pillar 100. A certain degree of hole 104 is formed therethrough. This hole 104 is preferably drilled as close to the column 100 as possible. Further, the hole 104 does not need to be circular, and may be a U-shape in which the column 100 side is a flat surface, or may be a rectangular hole.
[0024]
The reinforcing fiber anchor 1 according to the present invention is installed through the hole 104 drilled in the sleeve wall 101. Next, the reinforcing fiber anchor 1 will be described.
[0025]
FIG. 6 shows an embodiment of the reinforcing fiber anchor 1 of the present invention. In this embodiment, the so-called reinforcing fiber anchor 1 includes a reinforcing fiber bundle 2 having a large number of reinforcing fibers f and a tubular member 4 disposed so as to surround the reinforcing fiber bundle 2. That is, the tubular member 4 is arranged so that the reinforcing fiber bundle 2 extends through the center hole 6, and between the tubular member 4 and the reinforcing fiber bundle 2, as described in detail later, Sufficient voids are maintained for the resin to be injected.
[0026]
The reinforcing fiber bundle 2 is generally produced by arranging reinforcing fibers f in a parallel state. That is, it is produced by bundling a plurality of strands (reinforced fiber bundles) produced by twisting a predetermined number of reinforcing fibers f in parallel or loosely by twisting them in parallel or loosely.
[0027]
As the reinforcing fiber f, carbon fibers, glass fibers, inorganic fibers including ceramic fibers, aramid fibers, polyethylene fibers, polypropylene fibers, organic fibers including nylon fibers, or metal fibers including titanium fibers, stainless steel fibers, and iron fibers. It can be used alone or in combination of two or more. By mixing and using fibers having various physical properties, the characteristics of each fiber are exhibited at each level of tensile stress, and good deformation performance can be obtained. For example, when a fiber having a large elongation at break such as an aramid fiber and a fiber having a large elastic modulus such as a carbon fiber are mixed, a composite having a high initial elasticity and a large elongation at break can be formed.
[0028]
Usually, as the reinforcing fiber anchor 1 for a concrete structure, carbon fiber is preferably used, and any type of carbon fiber such as PAN, pitch, or the like may be used. Preferably, high-strength, high-elasticity carbon fibers having a strength of 100 kgf / mm ² or more and an elastic modulus of 10 Tonf / mm ² or more are used. When organic fibers are used, the organic fibers preferably have a strength of 100 kgf / mm ² or more and an elastic modulus of ² Tonf / mm ² or more.
[0029]
On the other hand, the tubular member 4 can be made of various materials and sizes. Generally, the inner diameter of the center hole 6 is 2 to 100 mm, the wall thickness is 0.01 mm to 50 mm, and a metal pipe such as a steel pipe. However, a pipe made of a resin material such as polyethylene, polypropylene, nylon, vinyl chloride, or rubber-based resin can also be used.
[0030]
According to the method for reinforcing a concrete structure according to the present invention, the reinforcing fiber anchor 1 not impregnated with resin is cut to a desired size, and at this time, the reinforcing fiber bundle 2 is, as shown in FIGS. For example, L ₁ = _{1 to} 10 cm protrudes from both ends. In this state, the reinforcing fiber anchor 1 is inserted into the wall hole 104 formed in the sleeve wall 101. This state is shown in FIG.
[0031]
Next, resin is injected into the tubular member 4 of the reinforcing fiber anchor 1, and the reinforcing fiber bundle 2 in the tubular member 4 is impregnated with resin. The resin used can be the same as the resin impregnated in the reinforcing fiber sheet 10 described above, and is a room temperature curing type or thermosetting type epoxy resin, or vinyl ester resin, MMA resin, unsaturated polyester. A radical reaction resin such as a resin or a urethane resin can be preferably used.
[0032]
When the resin injection into the tubular member 4 is completed, only the tubular member 4 is taken out from the wall hole 104 while the resin is usable. Next, both end portions 3 projecting outward from the wall holes 104 of the resin-impregnated reinforcing fiber anchor 1 are pressed onto both end portions of the reinforcing fiber sheet 10 attached to the concrete structure, as shown in FIG. Thus, it opens in the shape of a fan, and affixes on the reinforcing fiber sheet 10 with the same resin as the reinforcing fiber sheet-impregnated resin, and is cured. The operation of attaching the reinforcing fiber anchor 1 to the reinforcing fiber sheet 10 is preferably performed while the resin in which the reinforcing fiber bundle 2 is impregnated with resin is usable.
[0033]
Thereby, the reinforced fiber sheet 10 affixed to the concrete pillar 100 is mutually connected by the reinforced fiber anchor 1, is integrated, and can achieve the same effect as when the reinforced fiber sheet 10 is wound around the pillar. That is, according to the present invention, both the U-shaped reinforcing fiber sheets 10 attached to both sides of the concrete column 100 are connected by the reinforcing fiber anchor 1 by simply making a small hole 104 in the wall, and the pseudo-closed type It is possible to reinforce. Also, the construction period can be shorter than in the prior art.
[0034]
In the present invention, the width of the reinforcing fiber sheet 10, the length of the end portion 3 of the reinforcing fiber anchor 1, the number of reinforcing fiber bundles 2, and the like are obtained by opening the reinforcing fiber anchor end portion 3 into a fan shape. It is appropriately selected so as to be effectively fixed above. At this time, the sector shape is determined from the following points.
(1) If the angle of the fan is too large, the efficiency of the force transmitted to the yarn is reduced, and consequently the tension generated on the sheet cannot be borne.
(2) If the length of the fan is increased, a relatively large sheet width (W) can be shared even at a small angle. However, since the RC pillar width of a building is usually about 70 to 90 cm, the fan position depends on the wall position. Length is limited.
[0035]
For example, the reinforcing fiber anchor 1 has an outer diameter (D1) of 20 mm, an inner diameter (D2) of 10 mm, and a length (L1) of 500 mm in FIG. 85 fiber bundles (strands) composed of 24,000 carbon fibers were arranged in parallel in one direction. The strength of the carbon fiber was 490 kgf / mm2, the elastic modulus was 24 Tonf / mm2, and the protruding lengths (L2) at both ends were 100 mm.
[0036]
In the said Example, although both the reinforcing fiber sheets 10 affixed on the both sides of the concrete pillar 100 shall be connected using the one reinforcing fiber anchor 1, it can also connect using two or more. It is.
[0037]
Moreover, in the said Example, although the pillar part which has a wall part demonstrated as the concrete pillar 100 with a sleeve wall, a walled pillar part may be a beam and a girder which has a wall, and also wall type. It can also be used as a bridge pier, etc., and the reinforcing method of the present invention can be applied to these walled pillar portions to achieve the same effects as described in the above embodiments.
[0038]
【The invention's effect】
As described above, the method for reinforcing a concrete structure using the reinforcing fiber sheet according to the present invention includes a through-hole formed in a wall portion connected to a pillar portion in a concrete structure in which a wall portion is integrally formed on a pillar portion. The reinforcing fiber anchor is installed in the through hole, and both ends of the reinforcing fiber of the reinforcing fiber anchor are made of resin, and the reinforcing fiber sheet attached to the concrete column portion is connected. Even in concrete structures such as supporting pillars and beams, the same reinforcing effect as that obtained when the continuous reinforcing fiber sheet is wound can be obtained, the construction is easy, and the construction period can be shortened.
[Brief description of the drawings]
FIG. 1 is a perspective view of a concrete column with a sleeve wall for explaining a reinforcing method according to the present invention, and FIG. 1 (A) shows a mode in which reinforcing fiber sheets are attached adjacent to each other, and FIG. B) shows a mode in which the reinforcing fiber sheets are pasted apart from each other.
FIG. 2 is a plan view of the concrete pillar with a sleeve wall shown in FIG.
FIG. 3 is a diagram illustrating a mode in which reinforcing fiber sheets attached to both sides of a concrete column are connected by reinforcing fiber anchors.
FIG. 4 is a diagram illustrating a mode in which reinforcing fiber sheets attached to both sides of a concrete column are connected by reinforcing fiber anchors.
5A and 5B are views for explaining the structure of a reinforcing fiber sheet, in which FIG. 5A is a cross-sectional view and FIG. 5B is a perspective view.
FIG. 6 is a perspective view for explaining the structure of a reinforcing fiber anchor.
FIG. 7 is a perspective view for explaining a conventional method for reinforcing a concrete column.
FIG. 8 is a perspective view for explaining a conventional method for reinforcing a concrete pillar with a sleeve wall.
FIG. 9 is a plan view for explaining a conventional method for reinforcing a concrete pillar with a sleeve wall.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcing fiber anchor 2 Reinforcing fiber bundle 4 Tubular member 10 Reinforcing fiber sheet 11 Support body 12 Adhesive 100 Concrete pillar 101 Sleeve wall 104 Wall hole

Claims (6)

A method of reinforcing a pillar part in a concrete structure in which a wall part is integrally formed with a pillar part,
(A) drilling a through hole in the wall portion connected to the column portion;
(B) a step of attaching a reinforcing fiber sheet to each side of the pillar part divided at the wall part;
(C) a step of installing a reinforcing fiber anchor in which a plurality of reinforcing fibers are arranged in a tubular member through the through hole;
(D) injecting resin into the tubular member of the reinforcing fiber anchor, and impregnating the reinforcing fiber with resin;
(E) removing the tubular member within the pot life of the resin;
(F) Both ends of the reinforcing fiber are positioned at each end of the reinforcing fiber sheet, then each end is expanded into a fan shape, and both ends of the reinforcing fiber are bonded to the reinforcing fiber sheet with resin. The process of
(G) a step of curing the resin;
A method for reinforcing a concrete structure comprising the steps of: 2. The method for reinforcing a concrete structure according to claim 1, wherein the reinforcing fiber sheet includes a support and reinforcing fibers arranged on the support. The method of reinforcing a concrete structure according to claim 1 or 2, wherein the reinforcing fiber anchor includes a tubular member and reinforcing fibers arranged in the tubular member. 4. The method for reinforcing a concrete structure according to claim 3, wherein the tubular member is a pipe made of metal or resin. The reinforcing fiber is an inorganic fiber including carbon fiber, glass fiber, ceramic fiber, aramid fiber, polyethylene fiber, polypropylene fiber, organic fiber including nylon fiber, or metal fiber including titanium fiber, stainless steel fiber, iron fiber alone. The method for reinforcing a concrete structure according to claim 2, 3 or 4, wherein a plurality of types are used in combination. 6. The method for reinforcing a concrete structure according to claim 2, wherein the resin is a room temperature curable or thermosetting epoxy resin, a polyester resin, a polyamide resin, a polycarbonate resin, or a radical reaction resin. .

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