JP2000167958A - Reinforced fiber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a developing ratio of a strength, to upgrade operability of a building site execution, and to shorten an executing time by adhering reinforcing fibers arranged in one direction to a support having intersecting pluralities of warps and wefts, and arranging the warps of the support at a specific pitch. SOLUTION: This reinforced fiber sheet is obtained by adhering reinforcing fibers arranged in one direction to a support having intersecting pluralities of warps and wefts. As the fibers, carbon fiber, aramid fiber, glass fiber or the like is used, but preferably the carbon fiber is used. As the support, a plurality of the warps of a reinforcing fiber direction and a plurality of the wefts perpendicular to the warps are arranged normally at a pitch of an equal interval. Intersections of the warps and the wefts are obtained by adhering them with an adhesive or arranging the one fibers of two at the same position and sandwiching the other yarns between the two yarns and twisting it to fix it. The warps of the support are arranged at a pitch of 25 mm or above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a reinforced fiber sheet suitably used for reinforcing civil engineering and building structures such as columns and piers of elevated roads, chimneys, and decks of elevated roads.

[0002]

2. Description of the Related Art In recent years, construction methods for reinforcing civil engineering and building structures with a reinforcing fiber sheet using carbon fibers or the like have been rapidly spreading. In general, a reinforcing fiber sheet is attached to a resin that has been applied to the civil engineering and architectural structure, and the cured resin is further overcoated.If necessary, this operation is repeated several times to laminate several layers and cure at room temperature. Finished.
At this time, many reinforcement objects are not planar, but are often prismatic or cylindrical.

[0003] As the reinforcing fiber sheet, a sheet preliminarily impregnated with a part or all of the curing resin (hereinafter, referred to as "prepreg sheet"), a sheet woven with a fiber different from the reinforcing fiber (hereinafter, referred to as "UD cloth"), Alternatively, a sheet (hereinafter, referred to as a “double scrim sheet”) in which a triaxial mesh body or the like is adhered to both surfaces of a reinforcing fiber is used.

[0004]

However, among the above, first of all, the prepreg sheet needs to be stored at a low temperature in order to prevent deterioration during long-term storage. There is a problem that the sheet is hardened due to an increase in the viscosity of the resin, and it is difficult to wind around corners such as prismatic columns.

[0005] In the UD cloth, weaving is performed to form a sheet. Since at least one of the warp and the weft of a fiber different from the reinforcing fiber penetrates in the thickness direction of the sheet, the curing resin used in the on-site construction easily flows to the opposite side through this penetrating portion, and as a result, There is a problem that the rate of strength development is low because of insufficient impregnation. Furthermore, in the double scrim sheet, since the yarns are arranged in the three-axis direction in the mesh-like body, the shape retention as the sheet is excellent, but it is difficult to wind at the corner of the prismatic column like the prepreg sheet. There is a problem to say.

[0006]

SUMMARY OF THE INVENTION With the widespread use of reinforced fiber sheets for reinforcing civil and architectural structures, reinforced fiber sheets that have a high rate of development of strength, have good workability in on-site construction, and can reduce construction time have been developed. It has been demanded. In view of the conventional problems as described above, the present inventors have repeatedly studied workability improvement in on-site construction, and have reached the present invention. That is, in the present invention, the reinforcing fibers arranged in one direction and a support body in which a plurality of warps and wefts intersect are bonded to each other, and the warps of the support are arranged at a pitch of 25 mm or more. A reinforced fiber sheet characterized by the above.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The reinforcing fiber sheet of the present invention is formed by adhering reinforcing fibers arranged in one direction and a support in which a plurality of warps and wefts intersect. As the reinforcing fibers, carbon fibers, aramid fibers, glass fibers and the like are used, and carbon fibers are preferable. In addition, the support usually has a plurality of yarns (warps) in the direction of the reinforcing fibers and a plurality of yarns (wefts) in the direction perpendicular thereto, which are arranged at regular intervals. The crossing point between the warp and the warp is bonded with an adhesive or fixed by arranging two fibers in the same position and twisting the other yarn between the two yarns. Can be used. As the warp and the warp, ordinary inorganic fiber or organic fiber yarn is used, but from the viewpoint of familiarity with the curable resin as an adhesive or cost, preferably,
It is selected from glass fiber, polyester fiber, vinylon fiber, polyamide fiber and the like.

In the present invention, the warps of the support are arranged at a pitch of 25 mm or more. Further, in the warp and the weft, it is preferable that at least the pitch interval of the warp alone is 25 mm or more, or that the pitch interval of both the warp and the weft is 25 mm or more.
The upper limit of the pitch interval is not particularly limited, but is usually 100 mm.
It is as follows. The pitch ratio between the warp and the weft forming the support (warp pitch / weft pitch) is preferably 1.2.
As mentioned above, it is particularly preferably 1.5 to 3.

As a well-known method, the spacing (pitch) of the yarns constituting the biaxial or triaxial mesh-like body in the double scream sheet as described in the section of the prior art is almost the same between all axes. The interval is, for example, in Japanese Patent Application Laid-Open No. 8-142238,
Although it is defined in the range of 20 mm, such a type has sufficient rigidity in any direction, but reinforcement of a prismatic column having a corner radius of curvature of about 20 to 30 mm or a flat surface with irregularities In this case, there is a problem that the ability to follow the reinforcing surface is not sufficient. In the above-mentioned publication, the reason why the yarn interval is preferably 2 to 20 mm is as follows. However, in the present invention, if the yarn has a moderate fiber weight,
It has been found that it is more economical to make the pitch interval larger than 20 mm, especially 25 mm or more.

Further, the basis weight of the warp and the weft of the support of the reinforcing fiber sheet of the present invention is usually not more than 80 mg / m, preferably 10 to 40 mg / m. The basis weight is usually 120 mg / m or less,
Preferably it is 20 to 80 mg / m. The basis weight ratio (warp basis weight / weft basis weight) of the warp and the weft forming the support is preferably 0.8 or less, and particularly preferably 0.2 to 0.2.
0.6. That is, in the reinforcing fiber sheet of the present invention, it is most desirable that the warp direction in the reinforcing fiber direction is very flexible and the weft direction has appropriate rigidity. In addition, as the basis weight of the warp and the weft, the weight per unit area of the fiber is usually 1 to 30 g / m ² , preferably ^{2 to} 10 g.
/ M ² .

On the other hand, in the reinforcing fiber sheet of the present invention, the basis weight of the reinforcing fiber is also selected depending on the necessary degree of reinforcement, but is usually about 200 to 800 g / m ² . In the reinforcing fiber sheet of the present invention, the support can be bonded to both sides of the reinforcing fiber to reinforce the sheet structure. However, when the basis weight of the reinforcing fiber is 300 g / m ² or more, the support is bonded to both sides of the reinforcing fiber. Is preferred.

The method for producing the reinforcing fiber sheet of the present invention is not particularly limited. For example, after an adhesive such as an epoxy resin is applied on a support to form an adhesive layer, the reinforcing fiber bundle is arranged in one direction. And the support, optionally heating,
What is necessary is just to pressure-bond with a press roller etc.

[0013]

According to the present invention, there is provided a reinforcing fiber sheet having a very flexible warp direction in the reinforcing fiber direction and a moderate rigidity in the weft direction. This reinforced fiber sheet is
Civil engineering such as elevated road pillars and piers, chimneys, elevated road decks, etc.
It is suitable for reinforcing building structures. In particular, it has excellent followability to a reinforcing surface when reinforcing a prismatic column or a plane having irregularities.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takeshi Watanabe 370 Enzo, Chigasaki, Chigasaki-shi, Kanagawa Prefecture Inside the Chemicals Composite Co., Ltd. F term (reference) 4F100 AA37A AD11A AG00A AG00B AG00C AK41B AK41C AK46B AK46C AK47A AK53G BA03 BA06 BA10B BA10C CB00 DG01A DG13B DG13C GB07 JA13B JA13C YY00B YY00C

Claims (4)

[Claims] 1. A reinforcing fiber which is arranged in one direction and a support body in which a plurality of warps and wefts cross each other are adhered, and the warps of the support are arranged at a pitch of 25 mm or more. A reinforced fiber sheet characterized by the above-mentioned. 2. The reinforcing fiber sheet according to claim 1, wherein the pitch ratio between the warp and the weft forming the support (warp pitch / weft pitch) is 1.2 or more. 3. The weight ratio of the warp and the weft forming the support (the weight of the warp / the weight of the weft) is 0.8 or less.
Or the reinforced fiber sheet of 2. 4. The reinforcing fiber sheet according to claim 1, wherein the support is adhered to both sides of the reinforcing fibers arranged in one direction.