JP2001279931A - Column reinforcing structure by reinforced fiber material sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure for a concrete structure by using a reinforced fiber material which does not generate degradation of strength at a corner portion of the concrete structure. SOLUTION: A reinforced fiber material sheet 2 is attached to a wall- equipped column consisting of a column portion and a wall portion over an area from the column portion to the wall portion thereof, or to an independent column 51 so as to surround the surface thereof, such that the fiber direction of the reinforced fiber material sheet 2 corresponds to the circumferential direction of the column portion or the independent column 51. The number of layers of the reinforced fiber material sheets 2 at the corner portion of the column portion of the wall-equipped column or the corner portion of the independent column is larger than the number of layers at a portion where the number of the layers of the reinforced fiber material sheets 2 attached to the surface of the column portion of the wall-equipped column or the surface of the independent column 51 is minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for a concrete structure. More specifically, the present invention relates to a reinforcing structure for a concrete structure in which a pillar with a wall and an independent pillar are reinforced with a reinforcing fiber material.

[0002]

2. Description of the Related Art For the purpose of seismic reinforcement of existing concrete structures, it is known that reinforcement is replaced by reinforcing fiber materials instead of steel plate reinforcement, and the practice has been widely implemented. The object to be reinforced by the reinforcing fiber material is a concrete reinforcement such as a beam, a floor slab, a column, a chimney or the like, and the reinforcement according to the purpose such as a shear reinforcement, a bending reinforcement, or the like is performed (for example, JP-A-9-67946). JP-A-9-132852).

[0003] Among the reinforcing fiber materials used here, a reinforcing fiber material using a long fiber is an anisotropic material. Therefore, a reinforcing structure is determined in consideration of the orientation direction of the fiber and the purpose of the reinforcing. When reinforcing a concrete structure such as a reinforcing fiber material with a reinforcing fiber material, a method is adopted in which the fiber axis is rotated so as to coincide with the circumferential direction of the column and the fiber axis is attached (for example, Japanese Patent Laid-Open No.
0-169211, JP-B-6-56060).

As the reinforcing fiber material, a unidirectionally oriented (UD) reinforcing fiber material, a fabric reinforcing fiber material, and the like are known, and in order to make the reinforcing effect effective, a fiber axis direction is a column of a reinforcing portion,
It is common to arrange them so as to match the circumferential direction of the beam.

[0005]

However, this method has the following major problems. That is, there is a problem that the tensile strength of the reinforcing fiber material at the corner portion is lower than the tensile strength of the reinforcing fiber material at the straight portion, and the reinforcing fiber material is easily broken at the corner portion.

In this specification, the term "corner" includes a corner of a pillar and a plane connected to the corner, and the plane may be all or a part.

In order to prevent a decrease in the strength of the corner portion, Japanese Patent Publication No. 6-56061 discloses that the corner portion has a radius of curvature of 30 mm.
As described above, it is recommended to perform the curved surface processing. However, as shown in Japanese Patent Publication No. 6-56061, even if a curved surface is processed to have a radius of curvature of 50 mm, only about 90% of the strength of a linear strand can be exhibited.

[0008] In addition, new tools and the like, experimental research on the toughness of RC columns shear-reinforced by sheet-shaped continuous fiber (Part 3) Summary of the experimental results and results, Summary of the Annual Meeting of the Architectural Institute of Japan (September 1997) As reported in (Mon.), even in an actual reinforcing experiment, the reinforcing fiber material may be broken at the corners.

Therefore, an object of the present invention is to increase the strength of a column with a wall or an independent column.

[0010]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, completed the following invention in order to increase the strength of a walled column or an independent column.

The reinforcing structure of a pillar according to the present invention is characterized in that the fiber direction of the reinforcing fiber sheet and the circumferential direction of the pillar portion or the circumferential direction of the independent pillar are different from those of the walled pillar or the independent pillar composed of the pillar portion and the wall portion. So that the reinforcing fiber material sheet is attached at least from the column portion of the walled column to the wall portion or around the independent column, and is attached to the surface of the column portion of the walled column or the independent column. Characterized in that the number of layers of the reinforcing fiber material sheet at the corners of the column portion of the walled column or at the corners of the independent columns is larger than the number of layers of the portion having the least number of layers of the reinforcing fiber material sheet on the surface And

In the present invention, the "post with wall" refers to a structure in which the post and the wall are integrated. In the present invention, “independent pillar” refers to a pillar that is independent of a wall. When simply saying "pillar", it is usually the case that both meanings may be included. However, the independent columns are sometimes simply referred to as columns for simplicity.

The column to which the reinforcing structure of the present invention is applied includes a column which is generally employed when reinforcing a concrete structure. That is, a state where the corners are chamfered,
Japanese Patent Application Laid-Open No. HEI 10-1692
A column in which a curved surface material is arranged at a corner portion as exemplified in Japanese Patent Publication No. 11 is also included.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The type of the reinforcing fibers used in the reinforcing fiber material of the present invention is not particularly limited, and examples thereof include organic fibers or inorganic fibers such as carbon fibers, glass fibers, and aramid fibers, or a combination of two or more. Preferably, carbon fibers are used to effectively reinforce the concrete structure. Examples of the carbon fiber include an acryl-based carbon fiber and a pitch-based carbon fiber. These carbon fibers are preferably those whose surfaces have been activated by surface treatment in order to increase the affinity with the resin.

The reinforcing fiber material is a unidirectionally oriented reinforcing fiber material or a woven structure reinforcing fiber material, and the woven structure is not particularly limited, such as plain weave, twill weave, and satin weave.

These reinforcing fiber materials are circulated so that the fiber axis direction of the reinforcing fiber material coincides with the circumferential direction of the column. `` Fiber axis direction '' means that the orientation direction is the fiber direction when the reinforcing fiber material has a unidirectionally oriented structure, and the warp or warp direction is the fiber axis direction when the reinforcing fiber is a woven structure. However, when the weaving density of the warp is different from that of the warp, it is reasonable to set the higher weaving density as the fiber axis direction. The reinforcing fiber used in the present invention is preferably a unidirectionally oriented reinforcing fiber.

[0018] These reinforcing fiber materials used in the present invention may be a low-weight woven fabric, a nonwoven fabric,
A thing to which a backing material such as a braided cloth is stuck may be used. Such a backing material is effective for preventing the reinforcing fiber material from being disturbed and opening, and for applying a resin, for fuzzing and for maintaining sheet properties. The material of the backing material is an organic fiber, a glass fiber, or the like.
m ² .

Specifically, a thermoplastic resin fiber nonwoven fabric is disposed on at least one surface of a reinforcing fiber material sheet aligned in one direction as exemplified in JP-A-9-132852, Sheet obtained by heat-sealing a material sheet and a thermoplastic resin fiber non-woven fabric, or JP-A-9-6794
No. 6, a thermoplastic resin braided cloth (soft) or the like is arranged on at least one surface of a unidirectionally aligned reinforcing fibrous material sheet, and the reinforcing fibrous material sheet and the thermoplastic resin A sheet to which a cloth (soft) is heat-sealed is preferably used.

The components of a thermoplastic resin fiber sheet such as a thermoplastic resin fiber non-woven fabric or a thermoplastic resin fabric (SOF) include polyamide fibers and polyester fibers.
Particularly, those having a melting temperature of 70 to 200 ° C are suitable. The reason is that fibers that melt at less than 70 ° C. have poor shape retention in summer, when the temperature is high, while if the melting temperature exceeds 200 ° C., much energy is required for heat fusion. That's why.

The form of the thermoplastic resin fiber sheet such as a thermoplastic resin fiber non-woven fabric or a thermoplastic resin fabric (soft) is not particularly limited, but has a through hole through which the resin can pass. Just do it.

The fiber basis weight of the thermoplastic resin fiber sheet is 5
１００100 g / m ² , preferably about 10-50 g / m ² .

Further, in order to positively pass the resin,
Hollow holes can be provided in this fiber sheet in the range of an opening ratio of 5 to 40%. The hollow hole may have an arbitrary shape such as a circular hole, an elliptical hole, a square hole, and a slit hole.

When the reinforcing fiber material of the present invention is applied to the surface of a concrete structure, the surface of the concrete structure is preliminarily subjected to a base treatment, then a matrix resin is applied, the reinforcing fiber material is provided, and a roller or the like is provided. By pressing the reinforcing fiber material with the crimping tool, the matrix resin applied to the lower surface is made to spring up, and while expelling bubbles such as air contained in the fiber layer of the reinforcing fiber material, the matrix resin is sufficiently filled in the fiber layer. Impregnate. A matrix resin is further applied according to the thickness of the fiber layer of the reinforcing fiber material.

When the reinforcing fiber material is multiply laminated on the surface of the concrete structure, a matrix resin is applied and the reinforcing fiber material is arranged for each layer, and the resin impregnation with a pressing tool such as a roller is performed each time. Is good.

The multiple lamination may be a multiple lamination of only unidirectional reinforcing fiber material and woven tissue reinforcing fiber, or a multiple lamination of a combination thereof.

When the thermoplastic resin fiber sheet is disposed on only one side of the reinforcing fiber material, when the reinforcing fiber material is impregnated with the resin, the reinforcing fiber material is used for the concrete structure in order to eliminate the fuzz by the rollers. On the other hand, it is desirable to arrange so that the surface to which the thermoplastic resin fiber sheet is fused is outside.

The matrix resin preferably contains a curing agent component and a resin component, and is preferably adjusted to have a resin viscosity of 100 to 10000 centiboise (25 ° C.) in consideration of the impregnation property of the reinforcing fiber material layer. . Particularly preferably 5
It is 00-5000 centivoise (25 degreeC). In order to adjust the viscosity of the matrix resin to such a viscosity, a solvent can be used. However, in consideration of the working environment, it is preferable that the solvent is solvent-free.

The types of the adhesive and the matrix resin used in the present invention are not particularly limited, but an epoxy resin is preferred. Examples of the epoxy resin preferably used in the present invention include bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, phenol novolak epoxy resin, cresol novolak epoxy resin, alicyclic epoxy resin, and halogenated epoxy resin. Resins, glycidylamine type epoxy resins and the like.

As a reactive diluent for epoxy resin, n-
At least one selected from butyl glycidyl ether, allyl glycidyl ether, 2-ethylhexyl glycidyl ether, styrene oxide, phenyl glycidyl ether, cresyl glycidyl ether, glycidyl methacrylate, and the like can be used. It is effective for

As the curing agent and the curing accelerator for the epoxy resin, those commonly used for epoxy resins can be applied. When the matrix resin is an epoxy resin and the reactive diluent is phenylglycidyl ether, for example, polyamidoamine, amidoamine, aliphatic polyamine such as diethylenetriamine, aromatic polyamine such as meta-xylenediamine, alicyclic polyamine such as mensendiamine, modified Examples thereof include tertiary amines such as polyamine and benzylmethylamine, imidazoles such as 2-methylimidazole, polymercaptans, polythiols, and boron trifluoride amine complexes.

The selection of the curing agent and the curing accelerator is preferably made so that the curing temperature of the matrix resin is cured within several days at room temperature of about 10 to 40 ° C.

The column reinforcing structure of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a reinforcing structure of the present invention for a column with a wall having one corner.
In FIG. 1, reference numeral 1 denotes a pillar with a wall of an existing concrete skeleton, 2-1 and 2-2 denote reinforcing fiber sheets, 3 denotes a pillar portion, and 4 denotes a wall portion. In FIG. 1, each of the terminals 6-1 and 6-2 of the first and second reinforcing fiber material sheets 2-1 and 2-2 is disposed on a different surface of the pillar portion 3, and one of the pillar portions 3 is disposed. It is attached around the corner portion from one corner to the wall portion 4. The two reinforcing fiber material sheets 2-1 and 2-2 are wrapped around and attached so that the fiber direction matches the circumferential direction of the pillar portion 3. The ends of the reinforcing fiber material sheets 2-1 and 2-2 are overlapped at the corners of the pillar portion 3 to form an overlapped portion 5.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 shows a walled column 1 having one corner.
1 is a cross-sectional view of the conventional reinforcing structure for the conventional reinforcing member 1; 1st, 2nd
Terminal 16- of reinforcing fiber material sheets 12-1 and 12-2 of
1 and 16-2 are on the same surface of the wall portion 14, and the ends of both reinforcing fiber sheets 12-1 and 12-2 are
And the overlapping portion 15 is formed.

As described above, in the conventional reinforcing structure of the column with a wall 11 shown in FIG.
2 has only one layer, whereas the reinforcing structure of the walled column 1 of the present invention shown in FIGS. 1 and 2 has two layers of reinforcing fiber material sheets 2-1 and 2-2 at one corner. Therefore, the strength of the pillar portion 3 is higher than that of the conventional reinforcing structure of the walled pillar 11.

FIG. 4 shows a walled column 2 having two corners.
1 is a sectional view of the reinforcing structure of the present invention with respect to FIG. In FIG. 4, the first and second reinforcing fiber material sheets 2-1 and 2-2 are shown.
However, the ends 6-1 and 6-2 of both the reinforcing fiber material sheets 2-1 and 2-2 are different from each other in the pillar portion 3 so that the ends overlap each other over the two corners. Across the wall 4 from two corners,
The reinforcing fiber sheets 2-1 and 2-2 are wound around and attached so that the fiber directions of the reinforcing fiber sheets 2-1 and 2-2 coincide with the circumferential direction of the pillar portion 3.
The ends of the reinforcing fiber material sheets 2-1 and 2-2 are overlapped at the corners of the pillar portion 3 to form an overlapped portion.

FIG. 5 shows a walled column 3 having two corners.
1 is a cross-sectional view of the conventional reinforcing structure for the conventional reinforcing member 1; In FIG. 5, first and second reinforcing fiber material sheets 12-1 and 12-2 are provided.
Terminals 16-1 and 16-2 are on the same surface of the wall portion 14, and the ends of the reinforcing fiber material sheets 12-1 and 12-2 overlap on the surface of the wall portion 14 to form an overlapped portion. are doing.

As described above, the conventional pillar 31 with a wall shown in FIG.
4 has only one layer of reinforcing fiber material sheets 12-1 and 12-2 at the corners of the column portion 13, whereas the reinforcing structure of the walled column 21 of the present invention in FIG. Since two layers of reinforcing fiber material sheets 2-1 and 2-2 are arranged at the corners,
The strength of the column portion 3 is higher than the conventional reinforcing structure of the column 31 with a wall.

FIG. 6 is a sectional view of the reinforcing structure of the present invention for a walled column 41 having two corners on a diagonal line. FIG. 6 shows an example in which the reinforcing structure of the present invention is implemented only on one surface side of one corner of the walled column 41.
In FIG. 6, the first and second reinforcing fiber material sheets 2-1,
2-2, over one corner, with the ends overlapping each other, and both reinforcing fiber material sheets 2-1 and 2-
2 so that the terminals 6-1 and 6-2 of the reinforcing fiber material sheets 2-1 and 6-2 are arranged on different surfaces of the pillar portion 3 and extend from one corner to the wall portion 4. -2 so as to make the circumferential direction of the column portion 3 coincide with the fiber direction of -2. First and second reinforcing fiber material sheets 2-1 and 2-2
Are overlapped at the corners of the pillar portion 3 to form an overlapped portion. Therefore, the strength is high at the corner.

FIG. 7 is a perspective view of a reinforcing structure of the present invention for a column independent of a wall (sometimes referred to as an independent column or simply a column). One column is provided for a column 51 having four structural portions. This is a reinforcing structure by the reinforcing fiber material sheet 2.

FIG. 8 is a sectional view taken along line AA of FIG. 7 and 8, one reinforcing fiber material sheet 2
Of the reinforcing fiber material sheet 2 such that both ends of the pillars overlap each other at the corners of the pillar, and the winding start terminal 6-1 and the winding end terminal 6-2 are arranged on different surfaces of the pillar. The reinforcing fiber material sheet 2 is wound around and attached to the surface of the column 51 such that the fiber direction matches the circumferential direction of the column 51. As shown in FIGS. 7 and 8, both ends of the reinforcing fiber material sheet 2 are overlapped at one corner of the column 51, and the column 51 is attached to another reinforcing fiber material sheet 2. The number of layers of the reinforcing fiber sheet 2 is larger than that of the reinforcing fiber sheet 2, and the strength is increased at the corner.

FIG. 9 is a sectional view of a conventional reinforcing structure for an independent column. The reinforcing fiber material sheet 2 is wrapped around and attached to the surface of the pillar 51, but both ends are overlapped on the same surface of the pillar, and both ends 6-1 and 6 of the reinforcing fiber material sheet 2 are attached.
-2 is located on the same surface of the pillar, and the reinforcement is the reinforcing fiber material sheet 2 having only one layer at the corner, so that the corner has lower strength than the reinforcement structure of FIGS.

FIG. 10 is a sectional view showing a reinforcing structure of the present invention using two reinforcing fiber material sheets for an independent column having four corners. In FIG. 10, the first reinforcing fiber material sheet 2-1 covers three corners of the pillar 51,
Of the first reinforcing fiber material sheet 2
The first and second reinforcing fiber material sheets 2-1 and 2-2 cover three corners including the corners not covered by -1.
2 so that their ends overlap each other, and terminals 6-1, 6-2, 6 of each of the reinforcing fiber sheets 2-1, 2-2.
The reinforcing fiber material sheets 2-1 and 2-2 are adhered around the surface of the column 51 so that -3 and 6-4 are arranged on different surfaces of the column 51, respectively.

The reinforcing fiber material sheets 2-1 and 2-2 shown in FIG.
Are overlapped at two corners of 51 columns, and the strength is particularly high at the corners.

FIG. 11 is a sectional view showing a reinforcing structure using two reinforcing fiber material sheets for an independent column having four corners. In FIG. 11, the first reinforcing fiber material sheet 2-1 is shown.
Cover two corners of the pillar 51, and cover the two corners not covered with the first reinforcing fiber sheet 2-1 with the second reinforcing fiber sheet 2-2. In such a manner that the first and second reinforcing fiber material sheets 2-1 and 2-2 do not overlap each other at their ends, and are connected to one end 6-1 of the first reinforcing fiber material sheet 2-1. One terminal 6-3 of the second reinforcing fiber material sheet 2-2 is arranged on one surface of the pillar 51, and the other terminals 6-2 and 6-4 are placed on another surface of the pillar 51. To be arranged, as well as the reinforcing fiber material sheets 2-1, 2-2
The reinforcing fiber material sheets 2-1 and 2-2 are attached around the surface of the column 51 so that the fiber direction of the column 51 matches the circumferential direction of the column 51. On the surface of such a reinforcing structure, further reinforcing fiber material sheets 2-3 and 2-4 are arranged in the same arrangement state as described above, and the reinforcing fiber material sheets 2-1 and 2 which have already been disposed. -2 terminals 6-1 and 6
The terminal is attached so that the terminal is disposed on a surface different from the arrangement surface of -2, 6-3 and 6-4 to form a reinforcing structure. The attachment may be repeated one or more times.

In the reinforcing structure shown in FIG. 11, both ends of the lower and upper reinforcing fiber material sheets are overlapped at the four corners of the independent pillar, and the strength is increased at the corners. Further, in the reinforcing structure of FIG. 11, in the laminated structure of the reinforcing fiber material sheet, a space is generated inside, and this space generates a step of the reinforcing fiber material sheet, and it becomes difficult to maintain the linearity. It is desirable to fill the space with the step eliminating material 10 in order to prevent the occurrence of a step. A fiber reinforced material or a matrix resin for preventing occurrence of a step can be used as the step eliminating material 10.

FIG. 12 is a sectional view showing a reinforcing structure using four reinforcing fiber material sheets for an independent column having four corners. In FIG. 12, the first reinforcing fiber material sheet 2-
1 so as to cover the three corners of the column 51, and the second reinforcing fiber material sheet 2-2 is used to cover the first reinforcing fiber material sheet 2-
The first and second reinforcing fiber material sheets 2 cover the corners not covered with 1 and the corners adjacent to the corners.
1 and 2-2 so that their ends overlap each other, and
And the four terminals 6-1, 6-2, 6-3, and 6-4 of the second reinforcing fiber material sheets 2-1 and 2-2 are arranged on different surfaces of the pillar 51, respectively, and Reinforced fiber sheet 2
The reinforcing fiber material sheets 2-1 and 2-2 are attached around the surface of the column 51 so that the fiber directions of -1 and 2-2 coincide with the circumferential direction of the column 51. On the surface of such a reinforcing structure, another reinforcing fiber material sheet 2-3, 2
-4 are attached so as to be in the same arrangement state as described above, forming a reinforcing structure. The attachment may be repeated one or more times.

In the reinforcing structure shown in FIG. 12, both ends of each reinforcing fiber material sheet are overlapped at four corners of the independent pillar, and the strength is increased at the corners. In FIG. 12, reference numerals 10-1 and 10-2 denote step-eliminating materials for filling the space in order to prevent the space generated inside the laminated structure of the reinforcing fiber material sheet. Step eliminating material 10-1, 10-2
Is preferably used to maintain the linearity of the reinforcing fiber material sheet.

FIG. 13 is a sectional view showing a reinforcing structure using four reinforcing fiber sheets for an independent column having four corners. In FIG. 13, one reinforcing fiber material sheet 2-
1 so that both ends overlap each other at the corners of the pillar 51, and the winding start terminal 6-1 and the winding end terminal 6-2.
Are arranged on different surfaces of the pillar 51, and the fiber direction of the reinforcing fiber material sheet 2-1 matches the circumferential direction of the pillar, so that the reinforcing fiber sheet 2-1 It is attached around the surface. Another reinforcing fiber material sheet is further attached to the surface of such a reinforcing structure so as to be in the same arrangement as described above to form a reinforcing structure.
The attachment may be repeated one or more times. When the winding start terminal 6-1 and the winding end terminal 6-2 are rotated about 450 ° and the four reinforcing fiber material sheets are wound in the same manner, a surface structure having no step is obtained.

FIG. 13 shows a state in which the terminal at the end of winding and the terminal at the start of winding are brought into close contact with each other by using four reinforcing fiber material sheets 2-1, 2-2, 2-3, and 2-4. It is a formed reinforcement structure. With this configuration, the step caused by the terminal at the beginning of the first winding can be eliminated at the terminal at the end of the fourth winding. Moreover, since the four corners are reinforced with four layers of the reinforcing fiber material sheet, the strength is high.

FIG. 14 is a sectional view showing a conventional four-layer reinforcing structure for an independent column having four corners. FIG.
The length of the overlapping portion of the reinforcing fiber material sheet used for the reinforcing structure in FIG. 14 is the same as the length of one side of the column 51.
The winding start terminal 6-1 of the first reinforcing fiber material sheet 2-1 in FIG. 13 is a corner portion of the pillar 51, and the winding end terminal 6-2 is another corner portion. Subsequently, the winding start end 6-3 of the second reinforcing fiber material sheet 2-2 is started in close contact with the first winding end end 6-2, and the winding end end 6-4 is further cornered. It is. Similarly, the third and fourth reinforcing fiber material sheets 2-3 and 2-4 are wound.

Comparing the reinforcing structures of FIGS. 13 and 14, in FIG. 13, there are five layers of continuous reinforcing fiber material sheets at the four corners of the independent columns, but in FIG. There are only four layers of material sheet and one layer of discontinuous reinforcing fiber material sheet with seams. Therefore, the reinforcing fiber sheet shown in FIG. 13 and the reinforcing structure in FIG. 14 use the same amount of reinforcing fiber sheet, but the reinforcing structure in FIG.

FIGS. 15 to 17 conceptually show sectional views of columnar bodies having various cross sections to which the present invention can be applied. FIG. 15 shows a concrete pillar whose corner is curved. FIG. 16 shows a square pillar made of concrete made by chamfering corners. FIG. 17 shows a concrete column in which the outer surface is processed.
The flat plate 8 is laminated on one flat surface portion. The curved surface material 7 and the flat plate 8 are composed of one or a combination of two or more selected from precast concrete, wood, plastic and the like.

[0056]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
9 shows a schematic diagram of a tensile test of a bent portion of a reinforcing fiber material sheet 2 of a conventional material, and FIG. 20 shows a schematic diagram of a tensile test of a bent portion of a reinforcing fiber material sheet 2 of the present invention.

Example 1 Carbon fiber HTA (tensile strength: 4
00 kgf / mm ² , tensile modulus 24,000 kgf /
mm ² , manufactured by Toho Rayon Co., Ltd.) orientated in one direction, and a modified polyester nonwoven fabric having a melting point of 115 ° C. (having a basis weight of 25 g / m ² , manufactured by Mitsui Tosho Chemical Co., Ltd.) was pressed on one side to obtain a carbon fiber basis weight of 300 g. / M ² of the reinforcing fiber material.

This unidirectional reinforced textile material was flexible and could be wound on a drum having a diameter of 300 mm.
When the drape property of this reinforcing fiber material was evaluated using a feel meter used to measure the feel of natural fibers and synthetic fibers, the feel was 20 g (measurement temperature 25
° C), and drapability was excellent.

Epicoat 834 (bisphenol A type epoxy resin, manufactured by Yuka Shell Epoxy Co., Ltd., having a viscosity of about 2
5,000 centipoise), YED205 (manufactured by Yuka Shell Epoxy Co., Ltd., polyglycol diglycidyl ether, viscosity of about 25 centipoise) and a modified polyamine, and a matrix resin is used so that the viscosity becomes 4,000 centipoise (25 ° C.). It was adjusted.

As a concrete material, a cross section of 300 mm ×
A column having a height of 300 mm and a height of 900 mm was used. After performing the base treatment, the matrix resin was added at 400 g / m 2.
^{2 were} applied. On this, the reinforcing fiber material obtained by the above-mentioned manufacturing method was arranged so that the circumferential direction of the pillar and the fiber axis direction of the reinforcing fiber material coincided with each other. Then, the reinforcing fiber material was pressed by a hand roller, and the matrix resin was blown out from the lower surface to expel air contained in the fiber layer and impregnate the fiber layer with the resin.

After the matrix resin applied to the lower surface of the terminal at the beginning of winding of the reinforcing fiber material springs out on the surface of the reinforcing fiber material,
400 g / m ² of the matrix resin was applied to the overlapped portion, and the end of the winding was overlapped and pressed with a hand roller to form the overlapped portion. Here, as shown in FIG. 7, both ends of the reinforcing fiber material were overlapped at the corners of the pillar, and the winding start terminal and the winding end terminal were arranged on different surfaces of the pillar.

Example 2 Step of impregnating one layer of the reinforcing fiber material of Example 1 with the matrix resin of Example 1 above and having drapability before completely curing (curing at 25 ° C. for 4 hours) L-shaped (the radius of curvature of the L-shaped part is 30m
m) was placed on the aluminum plate and superimposed on the shape shown in FIG. 20 to produce a test piece (bending piece length 350 mm + 250 mm). As shown in FIG. 20, the length of the overlapping portion is 100 mm vertically from the corner and 100 mm horizontally.
And Thereafter, it was cured at 25 ° C. for 7 days.

The tensile strength of this bent test piece was determined by JI
It was measured under test conditions in accordance with SK7073. The tensile strength at the bent portion was 382 kgf / mm ² .

[Comparative Example 1] A step in which the matrix resin of Example 1 was impregnated into one layer of the reinforcing fiber material of Example 1 and which had a drapability before being completely cured (cured at 25 ° C for 4 hours). L-shaped (the radius of curvature of the L-shaped part is 30m
m), and a test piece (bending piece length 350 mm + 250 mm) having the shape shown in FIG. 19 was prepared.
Thereafter, it was cured at 25 ° C. for 7 days.

The tensile strength of this bent test piece was determined by JI
It was measured under test conditions in accordance with SK7073. The tensile strength at the bent portion was 329 kgf / mm ² .

Comparison between Example 2 and Comparative Example 1 reveals that a material obtained by laminating two layers of reinforcing fiber material at a corner has a higher tensile strength than a reinforcing fiber material having only one layer. Was.

Example 3 Carbon fiber HTA (tensile strength 4
00 kgf / mm ² , tensile modulus 24,000 kgf /
mm ² , manufactured by Toho Rayon Co., Ltd.) and oriented in one direction, and a modified polyester nonwoven fabric having a melting point of 115 ° C. (having a basis weight of 25 g / m ² , manufactured by Mitsui Tosho Chemical Co., Ltd.) is pressure-bonded to both surfaces to obtain a carbon fiber basis weight of 600 g. / M ² of the reinforcing fiber material.

The matrix resin of Example 1 was impregnated into one layer of the reinforcing fiber material, and had a drape property (cured at 25 ° C. for 4 hours) before being completely cured. The sample was placed on an aluminum plate having a radius of curvature of 30 mm) and overlapped with the shape shown in FIG. 20 to prepare a test piece (bending piece length 350 mm + 250 mm). Then 25
Cured at 7 ° C. for 7 days.

The tensile strength at the bent portion of the bent test piece was measured under test conditions in accordance with JIS K7073. The tensile strength at the bent portion was 374 kgf / mm ² .

Comparative Example 2 One layer of the reinforcing fiber material of Example 3 was impregnated with the matrix resin of Example 1 and had a drape property before being completely cured (cured at 25 ° C. for 4 hours). L-shaped (the radius of curvature of the L-shaped part is 30m
m), and a test piece (bending piece length 350 mm + 250 mm) having the shape shown in FIG. 19 was prepared.
Thereafter, it was cured at 25 ° C. for 7 days.

The tensile strength at the bent portion of the bent test piece was measured under test conditions in accordance with JIS K7073. The tensile strength at the bent portion was 281 kgf / mm ² .

A comparison between Example 3 and Comparative Example 2 reveals that a material obtained by laminating two layers of reinforcing fiber material at a corner has a higher tensile strength than a single layer of reinforcing fiber material. Was.

The above results are summarized in Table 1 below. Comparing the conventional methods, Comparative Example 1 and Comparative Example 2, shows that the carbon fiber weight is 600 g / m ² rather than 300 g / m ^2. Although the strength of the system using the sheet of Example 2 is reduced, as is clear from the comparison between Example 2 and Example 3, in the present invention, the reduction in strength is slight even at a carbon fiber weight of 600 g / m ² .

[0074]

[Table 1]

[0075]

When a compressive load or a bending moment acts on a prismatic concrete structure, a tensile force is applied to the reinforcing fiber material, and the reinforcing fiber material sheet may be broken at corners of the column. In the reinforcing structure of a concrete structure using the reinforcing fiber material sheet of the present invention, since the strength of the corners of the walled columns or the independent columns is increased, the corners can be prevented from breaking.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reinforcing structure of the present invention for a walled pillar having one corner.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of a conventional reinforcing structure for a walled pillar having one corner.

FIG. 4 is a cross-sectional view of a reinforcing structure of the present invention for a walled pillar having two corners.

FIG. 5 is a cross-sectional view of a conventional reinforcing structure for a walled pillar having two corners.

FIG. 6 is a cross-sectional view of a reinforcing structure of the present invention for a walled pillar having two corners.

FIG. 7 is a perspective view of the reinforcing structure of the present invention for an independent pillar having four corners.

8 is a cross-sectional view taken along the line AA in FIG.

FIG. 9 is a cross-sectional view of a conventional reinforcing structure for an independent pillar having four corners.

FIG. 10 is a cross-sectional view of the reinforcing structure of the present invention for an independent pillar having four corners.

FIG. 11 is a cross-sectional view of a reinforcing structure of the present invention for an independent column having four corners.

FIG. 12 is a cross-sectional view of the reinforcing structure of the present invention for an independent pillar having four corners.

FIG. 13 is a cross-sectional view of the reinforcing structure of the present invention for an independent column having four corners.

FIG. 14 is a cross-sectional view of a conventional reinforcing structure for an independent pillar having four corners.

FIG. 15 is a cross-sectional view of a pillar whose corner is curved.

FIG. 16 is a sectional view of a column in which a corner is chamfered.

FIG. 17 is a sectional view of a column in which a curved surface material is arranged at a corner.

FIG. 18 is a schematic diagram of a bending portion tensile test.

FIG. 19 is a schematic view of a bending portion tensile test of a reinforcing fiber material sheet in a conventional reinforcing structure.

FIG. 20 is a schematic diagram of a tensile test of a bent portion of a reinforcing fiber material sheet in the reinforcing structure of the present invention.

[Explanation of symbols]

1, 11, 21, 31, 41 Pillar with wall 2, 2-1, 2-2, 2-3, 2-4, 12-1, 12
-2 reinforcing fiber material sheet 3,13 pillar part 4,14 wall part 5,15 overlapping part 6-1, 6-2,6-3,6-4,6-5,6-6,6
-7, 6-8, 16-1, 16-2 Terminal 7 Curved surface material 8 Flat plate 10, 10-1, 10-2 Step eliminating material 51 columns

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Ando 234, Kazuchikari, Nagaizumi-cho, Sunto-gun, Shizuoka Prefecture Inside of the Toho Rayon Co., Ltd. (72) Inventor Kazuyuki Kado 2-5-8 Kitaaoyama, Minato-ku, Tokyo F-term (reference) 2E176 AA04 BB29

Claims (11)

[Claims] Claims: 1. With respect to a walled column composed of a pillar portion and a wall portion or an independent pillar, the fiber direction of the reinforcing fiber material sheet and the circumferential direction of the pillar portion or the circumferential direction of the independent pillar are made to coincide with each other, The reinforcing fiber material sheet is attached at least from the column portion to the wall portion of the walled column or around the independent column, and the reinforcing fiber material sheet at the surface of the column portion of the walled column or the surface of the independent column is attached. A reinforcing structure for a pillar, wherein the number of layers of the reinforcing fiber material sheet at the corner portion of the pillar portion of the walled pillar or at the corner portion of the independent pillar is larger than the number of layers of the portion having the smallest number of layers. 2. A reinforcing structure in which at least one surface side of a walled column including a column portion and a wall portion is reinforced with a reinforcing fiber material sheet, and (2) first and second reinforcing fibers. So that the ends of the material sheets overlap each other, and each end of each reinforcing fiber material sheet is arranged on a different surface of the pillar portion, and the fiber direction of each reinforcing fiber material sheet and the circumferential direction of the pillar portion (3) a reinforcing structure for a pillar, wherein each reinforcing fiber material sheet is attached around at least one corner of the pillar portion to the wall portion. 3. A reinforcing structure in which the surfaces of the independent columns are reinforced with a reinforcing fiber sheet, and (2) both ends of one reinforcing fiber sheet are mutually opposed at corners of the independent columns. In such a manner that the winding start terminal and the winding end terminal are arranged on different surfaces of the independent pillar, and that the fiber direction of the reinforcing fiber material sheet and the circumferential direction of the independent pillar coincide with each other, 3) A reinforcing structure for a pillar, wherein the reinforcing fiber material sheet is attached around the surface of the independent pillar. 4. A reinforcing structure in which the surfaces of the independent pillars are reinforced with a reinforcing fiber sheet, and (2) both ends of one reinforcing fiber sheet are mutually opposed at corners of the independent pillars. In such a manner that the winding start terminal and the winding end terminal are arranged on different surfaces of the independent pillar, and that the fiber direction of the reinforcing fiber material sheet and the circumferential direction of the independent pillar coincide with each other, 3) a reinforcing fiber material sheet is attached around the surface of the independent pillar, and (4) a surface of the reinforcing structure of (1) to (3),
A reinforcing structure for a pillar, characterized in that another reinforcing fiber material sheet is attached so as to satisfy the above (2) and (3), and the attachment is repeated at least once. 5. A reinforcing structure in which (1) the surface of an independent pillar is reinforced by a reinforcing fiber material sheet, and (2) three corners of the independent pillar are formed by a first reinforcing fiber material sheet. (3) the second reinforcing fiber material sheet covers a corner portion not covered by the first reinforcing fiber material sheet and a corner portion adjacent to the corner portion; (4) Such that the ends of the first and second reinforcing fiber material sheets overlap each other, and that the terminals of each of the first and second reinforcing fiber material sheets are arranged on different surfaces of the independent columns, and (5) Reinforcement of a pillar characterized in that the fiber direction of the reinforcing fiber material sheet and the circumferential direction of the independent pillar are made to coincide with each other, and (5) the reinforcing fiber material sheet is attached around the surface of the independent pillar. Construction. 6. A reinforcing structure in which the surface of an independent pillar is reinforced with a reinforcing fiber material sheet, and (2) three corners of the independent pillar are formed with a first reinforcing fiber material sheet. (3) the second reinforcing fiber material sheet covers a corner portion not covered by the first reinforcing fiber material sheet and a corner portion adjacent to the corner portion; (4) So that the ends of the first and second reinforcing fiber material sheets overlap each other, and that the four terminals of the first and second reinforcing fiber material sheets are respectively arranged on different surfaces of the independent pillars. (5) The reinforcing fiber material sheet is attached around the surface of the independent pillar so that the fiber direction of the reinforcing fiber material sheet matches the circumferential direction of the independent pillar. (5) Further on the surface of the reinforcing structure,
A reinforcing structure for a pillar, characterized in that another reinforcing fiber material sheet is attached so as to satisfy the above (2) to (4), and the attachment is repeated at least once. 7. A reinforcing structure in which (1) the surface of an independent pillar is reinforced with a reinforcing fiber material sheet, and (2) the first reinforcing fiber material sheet has two corners of the independent pillar.
(3) The second reinforcing fiber material sheet covers two corners that are not covered by the first reinforcing fiber material sheet, and (4) the first and the second reinforcing fiber material sheets. One end of the first reinforcing fiber sheet and one end of the second reinforcing fiber sheet are arranged on one surface of the independent pillar so that the ends of the reinforcing fiber sheet do not overlap with each other, (5) The reinforcing fiber material sheet is arranged such that the remaining terminals are arranged on another surface of the independent pillar, and that the fiber direction of the reinforcing fiber material sheet and the circumferential direction of the independent pillar match. Is attached around the surface of the independent column. (6) The surface of the reinforcing structure of (1) to (5) is further attached to
In such a manner that another reinforcing fiber material sheet is arranged in the above (2) to (4), and the terminal is arranged on a surface different from the terminal arrangement surface of the reinforcing fiber material sheet already arranged. A column reinforcement structure, wherein the column is attached and the attachment is repeated at least once. 8. The laminated structure of a reinforcing fiber material sheet,
8. The column reinforcing structure according to claim 4, wherein a space formed inside is filled with a step-eliminating material. 9. The column reinforcing structure according to claim 1, wherein the walled column or the independent column is a concrete structure. 10. The pillar according to claim 1, wherein the reinforcing fiber material sheet is one or two or more kinds selected from a unidirectionally oriented reinforcing fiber material and a woven tissue reinforcing fiber material. Reinforcement structure. 11. The woven structure is a plain woven structure, a twill woven structure,
The reinforcing structure for a pillar according to claim 10, which is selected from a satin weave and a satin weave.