JP3403988B2 - Repair and reinforcement of concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair / reinforcing material using a fiber-reinforced resin molded article.

[0002]

2. Description of the Related Art In order to develop the strength of a fiber-reinforced resin molded article, continuous fibers are often used as a reinforcing material. Continuous fiber reinforcement is mainly used in woven fabrics,
A woven fabric of high-strength fiber such as carbon fiber or aramid fiber does not have a light-transmitting property, and in order to impart light-transmitting properties, it is necessary to form the woven fabric into a mesh shape and provide a gap between the yarns. Was.

In addition, repair and repair of existing concrete structures
For reinforcement, a plate-like repair / reinforcement material such as a steel plate or a fiber-reinforced resin molded body using high-strength fiber that does not have translucency is used to secure a gap between the concrete structure and the repair / reinforcement material. After temporarily fixing it with anchor bolts etc., injecting material is injected into the gap and integrated, but since the plate-shaped repair / reinforcement material has no light transmission, visualization of the injection situation is possible. There was a problem that observation was not possible. If the injection is insufficient, the effect of repair / reinforcement will be insufficient.
It was hit with a test hammer or the like from above the reinforcing material, and the sound of the hit was used to confirm the injection status.

[0004]

However, when the woven body is formed into a mesh and a gap is provided between the yarns, a desired reinforcing effect may not be obtained because the amount of the reinforcing fibers is small. In addition, when only a part of the woven fabric is required to have translucency, if a gap is formed only in that part, the balance of the woven fabric becomes extremely poor, and it may be difficult to maintain the shape in the molding process. Was.

In addition, when a fiber reinforced resin plate is used for repairing and reinforcing a concrete building, it is difficult to judge the injection condition of the injection material by a tapping sound as compared with a visual check. There is also.

An object of the present invention is to provide a fiber-reinforced resin molded article.
Repairing and reinforcing materials in the shape of a plate are used for repairing concrete structures.
Secure the gap between the reinforcements with anchor bolts, etc.
After temporarily fixing, inject the injection material into the gap and integrate it
Repair / reinforcing material used for
Efficient and high strength, and at least one
Since the part has translucency, the injection condition of the injection material
Concrete structure characterized by visual observation
Repair and reinforcement materials.

[0007]

Means for Solving the Problems The invention according to the present application for attaining the above object has been achieved by using a fiber-reinforced resin molded article.
Repair and reinforcement of plate-shaped repair and reinforcement materials with concrete structures
Temporarily secure with anchor bolts etc. in a form to secure a gap between the materials
After that, it is used for the method of injecting the injection material into the gap and integrating
Repairing / reinforcing material , wherein the repairing / reinforcing material has a high-strength fiber and a glass fiber which do not have translucency in at least a part thereof , and a reinforcing fiber woven body which is a unidirectional reinforcing substrate. A thickness of 2 to 6 mm obtained by impregnating a translucent resin
And a fiber-reinforced resin molded article having a surface with irregularities.
And at least a part of the molded body has translucency and
Conch the injection condition of which is characterized in that can be observed visually
Repair / reinforcement material for reed structures .

[0008] A second aspect of the present invention is a unidirectional reinforcing base of the first aspect.
The material is a group of unidirectional reinforcing fibers consisting of high-strength fibers and glass fibers.
And the auxiliary yarn fiber and thermoplastic low melting point polymer
-Heats the woven fabric formed from the composite thread group of yarn as weft
Then, the low-melting polymer yarn is melted to form a unidirectional reinforcing fiber.
Unidirectional reinforcing base that binds the group and auxiliary yarn fiber group at each interlaced part
The third invention is the first invention, the second invention
The high-strength fiber according to any of the above,
Repair and reinforcement of concrete structures made of aramid fiber
It is. According to a fourth aspect of the present invention, a translucent tree according to the first aspect is provided.
Fat is unsaturated polyester resin or vinyl ester
It is a repair and reinforcement material for concrete structures that are resin ,

According to a fifth aspect of the present invention, there is provided the fiber reinforced material according to the first aspect.
Resin molded body is made of unidirectional reinforcing base material and chopped strand
After laminating the mat, the molded body obtained by impregnating the resin
Repair / reinforcement material for a concrete structure . A sixth invention is directed to the fiber strength according to any one of the first invention and the fifth invention.
Both ends or one end of the plasticized resin
The shape that can fit each other or the shape of the tip is the same
Conch characterized by having an oblique shape
It is a repair / reinforcing material for reed structures ,

In a seventh aspect , the first member is formed by using a fitting member.
The concrete structure according to any one of the inventions to the sixth invention.
Concrete fitting characterized by fitting repair / reinforcement material
It is a repair / reinforcement material for structural structures .

[0011]

[0012]

[0013]

[0014]

The fiber-reinforced resin molded article of the present invention is obtained by impregnating a light-transmitting resin into a fiber woven body having at least a portion of high-strength non-light-transmitting fiber and glass fiber. By impregnating the glass fiber of the fiber woven fabric with a resin having a refractive index close to that of the glass fiber, for example, an unsaturated polyester resin or a vinyl ester resin, a fiber reinforced resin molding in which the glass fiber portion has translucency is formed. The body is obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below in more detail. The configuration of the reinforcing fiber woven fabric used in the fiber-reinforced resin molded article of the present invention is a unidirectional fiber having at least a portion of a high-strength non-light-transmitting fiber and a glass fiber.
It is not particularly limited as long as it is a reinforcing substrate

Specifically, a woven fabric formed by forming a unidirectional reinforcing fiber group consisting of high-strength fiber and glass fiber as a warp and a composite yarn group of an auxiliary yarn fiber and a thermoplastic low-melting polymer yarn as a weft is heated. Preferably, a unidirectional reinforcing base material obtained by melting the low-melting polymer yarn and binding the unidirectional reinforcing fiber group and the auxiliary yarn fiber group at each entangled portion is used. This is excellent in that when forming the fiber-reinforced resin molded body, the reinforcing fibers can be efficiently arranged in a sheet shape and can be molded without disturbing the arrangement of the reinforcing fibers. In particular, when producing a molded product having an irregular cross section, the effect is remarkable because disturbance of the orientation of the fiber and a change in the width are prevented, and the material has a drape property that facilitates molding.

The high-strength fibers having no translucency of the unidirectional reinforcing fiber group include, for example, carbon fibers, graphite fibers, aramid fibers,
High strength such as silicon carbide fiber and alumina fiber,
It is a highly elastic multifilament or spun yarn, and it is a preferable configuration to employ one or two or more kinds of fibers selected from these. Among them, carbon fiber or aramid fiber is particularly preferable because of its high strength and light weight.

The glass fibers forming the unidirectional reinforcing fiber group are not particularly limited, but specific examples include yarns of E glass, alkali-resistant glass, C glass, and S glass, and roving yarns. The thickness of the glass fiber used is preferably closer to the thickness of the high-strength fiber in terms of weaving.

The ratio of the high-strength fiber to the glass fiber is preferably 20/1 to 1/1. If either one becomes excessive, it becomes difficult to balance the properties of light transmission and light shielding.

The auxiliary yarn fibers constituting the weft are supplied as a composite yarn group of the auxiliary yarn fibers and a thermoplastic low-melting polymer during weaving, and then the thermoplastic low-melting polymer yarn is melted to be unidirectionally reinforced. A method of binding the fiber group and the auxiliary yarn fiber group at each entangled portion is preferable. The auxiliary yarn fibers constituting such a composite yarn group are preferably fibers having the same or lower strength and elastic modulus as the unidirectional reinforcing fibers, and the auxiliary yarn group is less than the density of the unidirectional reinforcing fibers, and The cross-sectional area of the auxiliary yarn fiber is preferably a half or less of the cross-sectional area of the unidirectional reinforcing fiber.

The thermoplastic low-melting polymer yarns constituting the composite yarn group are, for example, monofilaments, multifilaments, slit yarns made of nylon, copolymerized nylon, polyester, vinyl chloride, polyurethane and the like. . Among them, the copolymerized nylon yarn is suitable for molding a fiber-reinforced resin molded article because it has an extremely good adhesiveness to a resin even if it is melted in a step described later and remains in the woven fabric. The low-melting polymer yarn is preferably a material that can be fused at about 110 to 150 ° C., and specific examples thereof include copolymerized nylon yarn “Elder” manufactured by Toray Industries, Inc.

The reinforcing fiber woven body may be impregnated with a resin in a single layer, or may be impregnated with a resin after being laminated with a glass fiber material such as a chopped strand mat or a glass fiber woven or knitted fabric.

The translucent resin impregnating the woven fabric is
Although not particularly limited, a resin having a refractive index value close to that of glass fiber is preferable when imparting light-transmitting properties. Since the refractive index of the glass fiber is about 1.51 to 1.55, the refractive index of the resin is preferably about 1.50 to 1.57. Specifically, unsaturated polyester resin, vinyl ester resin,
Epoxy resins may be mentioned, and among them, unsaturated polyester resins and vinyl ester resins having a fast curing time are particularly preferable.

The fiber-reinforced resin molding can be used for repairing and reinforcing existing concrete structures. Specifically, a fiber-reinforced resin molded body is adhered to the surface of the building with an adhesive to reinforce the structure. At this time, irregularities are imparted to the surface of the fiber-reinforced resin molded body, that is, an adhesive surface with the building. Is preferred. This is intended to improve the adhesiveness by providing irregularities on the adhesive surface and increasing the surface area. In the case where the existing building is a resin plate or plate-like glass having a light-transmitting property, a material having a light-transmitting property is selected for the adhesive with the building, and the fiber-reinforced resin molded article of the present invention is used. If reinforced, translucency can be imparted to at least a part. Further, by selecting the ratio between the high-strength fiber having no light-transmitting property and the glass fiber, a light-shielding property can be imparted.

The method of providing such irregularities is not particularly limited, but it can be provided by rough processing such as sanding, blasting, and buffing.

[0027]

[0028]

Since the fiber-reinforced resin molded article of the present invention has at least a part of a light-transmitting property, not only the state of injection can be visually observed from above the repair / reinforcement material, but also the formation of an air pocket due to pressure bonding. Since the presence can be confirmed, there is no defect in the injection condition, and the method is excellent in that a sufficient repair / reinforcement effect can be obtained.

Further, both ends or one end of the fiber-reinforced resin molded article have the same shape such that the ends can be fitted to each other as shown in FIGS. By forming the plate into an oblique shape, connecting the plates with each other, and connecting the connecting portion with an adhesive, it is possible to withstand the pressure when the injection material is injected. Fig. 5
And a male / female shape as shown in FIG. The fitting shape of the connecting portion is not limited to the above, but it is preferable that the area of the bonding surface is as large as possible. The method of processing into such a fitting shape is not particularly limited, but after forming the fiber-reinforced resin molded body, cutting is performed using a processing machine for cutting metal or wood, such as an NC lathe, an end mill, and a planar. Alternatively, a spacer may be attached to obtain a fitting shape when the resin is impregnated with a translucent resin and molded.

As another method of fitting, fitting members 2 and 3 can be used as shown in FIGS. For example, by selecting the fitting member 3 as shown in FIG. 9, the fitting can be performed without processing the end of the fiber-reinforced resin molded body 1 into a complicated shape. The fitting member shown in the figure is an example, and its shape is not particularly limited.

The thickness of the fiber-reinforced resin molded product is 2 to 6 mm
Is preferred. If the thickness is less than 2 mm, the fiber-reinforced resin molded body bulges due to the injection pressure of the injection agent, and the appearance becomes poor. Further, when the thickness exceeds 6 mm, there is a problem that the fiber-reinforced resin molded article becomes expensive or the weight of the fiber-reinforced resin molded article increases.

[0033]

The present invention will be described below in detail with reference to examples.

Example 1 Carbon fiber trading card T7 was used as the high-strength fiber of the unidirectional reinforcing base material.
00SC (24000 filaments: manufactured by Toray Industries, Inc.), E glass fiber ER1150TM as glass fiber
(1150 tex: manufactured by Asahi Fiberglass Co., Ltd.) A unidirectional reinforcing fiber group is arranged at a density of 10.5 fibers / 25 mm to form a warp, and E glass fiber E is used as an auxiliary yarn fiber.
Heating the woven fabric formed as a weft using a composite thread group of CE 225 1/0 1Z (22.5 tex: manufactured by Nitto Boseki Co., Ltd.) and a thermoplastic low melting point polymer yarn elder (50 denier: manufactured by Toray Industries, Inc.) A low-melting polymer yarn was melted to prepare a unidirectional reinforcing base material in which a unidirectional reinforcing fiber group and an auxiliary yarn fiber group were bound at each entangled portion. The area occupied by the high-strength fiber and the glass fiber of the unidirectional reinforcing substrate is 10/1.
Was adjusted to

Next, the one-way reinforcing base material and the chopped strand mat (manufactured by Nitto Boseki Co., Ltd.) are laminated, molded with an unsaturated polyester resin so that the fiber content becomes 30%, and fiber-reinforced to a thickness of 4 mm. A resin molding was obtained. The obtained fiber-reinforced resin molded product partially had a light-transmitting property.

Example 2 One side of the fiber-reinforced resin molded product obtained in Example 1 was subjected to rough sanding processing to give irregularities, and then epoxy resin was applied to a concrete plate having the shape shown in FIG. Used and glued. At the time of bonding, since the fiber-reinforced resin molded product had a light-transmitting property, the injection condition could be visually observed from above the fiber-reinforced resin molded product, and it was confirmed that there was no defect in the injection condition. The measurement results of the bending strength of the concrete plate reinforced by the fiber-reinforced resin molded product were as shown in FIG.

(Comparative product 1) The concrete plate described in Example 2 was measured for flexural strength without reinforcement by a fiber-reinforced resin molded product. The measurement results were as shown in FIG.

Comparative Example 1 A concrete plate reinforced with an iron plate was prepared in the same manner as in Example 2 except that a 2 mm-thick iron plate was used instead of the fiber-reinforced resin molded product. Since the reinforcing material did not have a light-transmitting property, the injection condition could not be visually observed from above the reinforcing material, and it could not be confirmed that there was no defect in the injection condition.

(Comparative Example 2) 4 mm thick molded with an unsaturated polyester resin so that the fiber content of the chopped strand mat is 30%.
Was prepared. A concrete board reinforced with a fiber-reinforced resin molded body was obtained in the same manner as in Example 2, except that the fiber-reinforced resin molded body was changed as described above. At the time of bonding, since the fiber-reinforced resin molded product had a light-transmitting property, the injection condition could be visually observed from above the fiber-reinforced resin molded product, and it was confirmed that there was no defect in the injection condition.
However, the measurement results of the bending strength of the concrete plate reinforced by the fiber-reinforced resin molded product were less effective as compared with Example 2 as shown in FIG.

[0040]

The fiber-reinforced resin molded article of the present invention has both light-transmitting and light-shielding properties and excellent properties such as high strength, and can be suitably used as a repair / reinforcement material. .

[0041]

[Brief description of the drawings]

FIG. 1 is a drawing showing the shape of a concrete plate in an example.

FIG. 2 is a drawing showing a load-displacement curve showing a result of a bending strength test of a concrete plate of Example 2.

FIG. 3 is a drawing showing a load-displacement curve showing a result of a bending strength test of a control concrete plate.

FIG. 4 is a drawing showing a load-displacement curve showing a result of a bending strength test of a concrete plate of Comparative Example 2.

FIG. 5 is a drawing showing an example of a preferred end shape of the fiber-reinforced resin molded article of the present invention.

FIG. 6 is a drawing showing an example of a preferred end shape of the fiber-reinforced resin molded article of the present invention.

FIG. 7 is a drawing showing an example of a preferred end shape of the fiber-reinforced resin molded article of the present invention.

FIG. 8 is a drawing showing an example of a preferable fitting member of the present invention.

FIG. 9 is a view showing an example of a preferable fitting member of the present invention.

[Explanation of symbols]

1 Fiber-reinforced resin molded body 2 Fitting member 3 Member for fitting

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Akimitsu Ouchi 1204 Oizumi-cho, Oizumi-cho, Gunma Pref.Kanebo Co., Ltd. Katsuharu Yamaga, Inventor, Katsuharu Yamaga 1-17, Sakura, Tsukuba City, Ibaraki Prefecture Shobond Construction Co., Ltd. (72) Inventor Tadashi Sano 1-17, Sakura, Tsukuba City, Ibaraki Prefecture Katsumi Hino, Inventor, Research Institute of Repair Engineering, Construction Co., Ltd. 2-2-7 Minamisuna, Koto-ku, Tokyo SHOBOND Masatoshi Nakayama, 2-2-7 Minamisuna, Koto-ku, Tokyo SHOBO (56) References JP-A-9-3745 (JP, A) JP-A-7 JP-A-243149 (JP, A) JP-A-10-25856 (JP, A) JP-A-10-292462 (JP, A) JP-A-4-149351 (JP, A) JP-B-52-37295 (JP, B2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04C 5/07 E04C 23/02

Claims (7)

(57) [Claims] 1. A plate-like repair such as a fiber-reinforced resin molded article
・ Gap between reinforcement and concrete structure
After securing temporarily with anchor bolts etc. in a form to secure the space,
Injecting grout into the gap, it is used in a method of integrating repairing and
A stiffener, the repair and reinforcement, having at least a portion of the high-strength fibers and glass fibers does not have a light-transmitting property, 且
The thickness is 2 to 6 mm obtained by impregnating a translucent resin into a reinforcing fiber woven body that is
It is a fiber-reinforced resin molded article provided with irregularities, and at least a part of the molded article has a light-transmitting property and an injection state of an injection material.
Concrete structure characterized by being visually observable
Repair and reinforcement materials . 2. The unidirectional reinforcing base material comprises a unidirectional reinforcing fiber group comprising high-strength fiber and glass fiber as a warp, and a composite yarn group of an auxiliary yarn fiber and a thermoplastic low-melting polymer yarn as a weft. The unidirectional reinforcing substrate according to claim 1, wherein the woven fabric is heated to melt the low-melting polymer yarn, and the unidirectional reinforcing fiber group and the auxiliary yarn fiber group are bound at each interlaced portion.
Repair and reinforcement for concrete structures . Wherein said high-strength fiber according to any one of claims 1 and 2, repair and reinforcement material according to claim 1 or 2 concrete structure according carbon fibers or aramid fibers. 4. A resin having a light transmitting property according to claim 1, the complement of claims 1 to 3 concrete structure according unsaturated polyester resin or vinyl ester resin
Repair and reinforcement materials . 5. The fiber-reinforced resin molded article according to claim 1 , obtained by laminating the unidirectional reinforcing base material according to claim 1 and a chopped strand mat and then impregnating the resin. moldings in a claims 1 to 4 Conch according
Repair / reinforcing materials for reed structures 6. The fiber-reinforced resin molded article according to claim 1 , wherein both ends or one end of the fiber-reinforced resin molded body has a shape such that the ends can be fitted to each other or a shape of a tip end. repair and reinforcement of claims 1 to 5 concrete structure of wherein a is obtained by the oblique shape is the same. 7. Using the fitting member, according to claim 1-6 noise
Repair and reinforcement of the concrete structure, characterized in that fitting the repair and reinforcement of concrete structures according to any Re
Wood .