JP4696431B2 - Reinforcing sheet and reinforcing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing sheet and a reinforcing method for reinforcing a building structure.
[0002]
[Prior art]
Conventionally, as a technique in such a field, there is one described in Japanese Patent Application Laid-Open No. 11-34211. The reinforcing sheet described in this publication is provided with a multiaxial assembly fabric and a fiber layer on one side of a release paper. An adhesive for adhering the release paper and the fiber layer is applied to a part of the release paper with the multiaxial assembly fabric interposed therebetween. And at the time of construction, it is affixed so that the fiber layer side of the reinforcing sheet may be on the building structure side on the surface of the building structure to which the thermosetting resin has been applied in advance. Thereby, the thermosetting resin penetrates into the reinforcing sheet, and the reinforcing sheet is attached to the building structure.
[0003]
[Problems to be solved by the invention]
However, the following problems exist in the conventional reinforcing sheet described above. That is, when the reinforcing sheet is attached to the building structure, the air permeability of the release paper is not good, so that the thermosetting resin hardly penetrates into the sheet. Thereby, there existed a problem that the adhesive force to the building structure of a reinforcement sheet will fall.
[0004]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a reinforcing sheet and a reinforcing method that have enhanced adhesion to a building structure.
[0005]
[Means for Solving the Problems]
The reinforcing sheet according to the present invention is a reinforcing sheet for reinforcing a building structure, in which a warp layer in which warps obtained by bundling a plurality of filaments are arranged in parallel and oblique yarns that are oblique to the warps are arranged in parallel. The first oblique yarn layer and the second oblique yarn layer in which the oblique yarns obliquely intersecting with the warp yarns from the opposite direction to the oblique yarns of the first oblique yarn layer are laminated. The braided fabric and the short fibers are irregularly arranged and a nonwoven fabric having a plurality of holes formed in accordance with a predetermined rule is laminated.
[0006]
In this reinforcing sheet, a so-called triaxial assembly fabric in which a warp layer and first and second oblique yarn layers are laminated, and a nonwoven fabric in which short fibers are irregularly arranged are laminated. For example, a plurality of holes are formed in accordance with a predetermined rule such as an arrangement at regular intervals in the vertical and horizontal directions or a geometric arrangement. Thus, since the multiaxial assembly is adopted as a component of the reinforcing sheet of the building structure, the building structure can be reinforced from multiple directions. In addition, the plurality of holes regularly arranged in the nonwoven fabric can uniformly remove the air from the reinforcing sheet during construction. Furthermore, the nonwoven fabric with irregularly arranged short fibers has good air permeability, so that the resin applied to the building structure during construction is easily replaced with the air in the reinforcing sheet and easily into the reinforcing sheet. Can penetrate.
[0007]
Each of the warp and the oblique yarns includes a heat-bonding filament, and the warp layer, the first oblique yarn layer, and the second oblique yarn layer are bonded to each other by the heat-welding filament. The braided fabric and the nonwoven fabric are preferably bonded by a heat-sealing filament. In this case, it is not necessary to separately prepare an adhesive or the like for bonding the assembled fabric and the nonwoven fabric. Therefore, it is possible to prevent the penetration of the resin into the fabric, which occurs when the adhesive penetrates into the fabric.
[0008]
Further, it is preferable that a weft layer in which wefts orthogonal to the warp are arranged in parallel is further laminated on the braid. In this case, the braided fabric is a so-called four-shaft braided fabric, and the reinforcing sheet on which the four-shaft braided fabric is laminated has higher rigidity than the reinforcing sheet on which the triaxial braided fabric is laminated.
[0009]
Each of the warp, the oblique yarn and the weft includes a heat-bonding filament, and the warp layer, the first and second oblique yarn layers, and the weft layer are bonded to each other by the heat-welding filament. The braided fabric and the nonwoven fabric are preferably bonded by a heat-sealing filament. In this case, it is not necessary to separately prepare an adhesive or the like for bonding the assembled fabric and the nonwoven fabric. For this reason, it is possible to prevent the resin from interfering with the fabric as the adhesive penetrates into the fabric.
[0010]
The reinforcing method according to the present invention is a reinforcing method for reinforcing a building structure, the step of applying a resin to the building structure, and the reinforcing sheet on the side of the reinforcing sheet on the reinforcing sheet from above the resin. It includes a step of pasting so as to be on the building structure side, and a step of bleeding the reinforcing sheet attached to the building structure.
[0011]
In this reinforcing method, after a resin is applied to a building structure, a reinforcing sheet is attached from above the resin. However, the reinforcing sheet is affixed so that the assembly side is the building structure side. And the reinforcement sheet affixed on the building structure is air-bleeded with a roller etc., for example. In this way, by attaching the reinforcing sheet to the building structure, the resin applied to the building structure at the time of construction can easily penetrate into the reinforcing sheet.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a reinforcing sheet and a reinforcing method according to the present invention will be described in detail with reference to the accompanying drawings.
[0013]
As shown in FIG. 1, the reinforcing sheet 10 has a braided fabric 12. This braid 12 is a so-called triaxial braid, and in order from the top, a warp layer 16 in which a plurality of warps 14 extending in the longitudinal direction (X direction in the figure) are arranged, and a slant that crosses the warp 14 obliquely. A first oblique yarn layer (first oblique yarn layer) 20 formed by arranging a plurality of yarns 18 in parallel, and a plurality of oblique yarns 22 obliquely intersecting the warp yarn 14 from the opposite direction to the oblique yarn 18 are arranged. A second oblique yarn layer (second oblique yarn layer) 24 is laminated. The yarns of the respective layers 16, 20, and 24 are arranged in parallel at a pitch of about 1 mm to about 25 mm. In the present embodiment, the oblique yarn 18 has an inclination of +45 degrees with respect to the longitudinal direction (X direction), and the oblique yarn 22 has an inclination of −45 degrees with respect to the longitudinal direction. However, the oblique yarn 18 may be inclined by +30 degrees and +60 degrees with respect to the longitudinal direction, and the oblique yarn 22 may be inclined by -30 degrees and -60 degrees with respect to the longitudinal direction.
[0014]
Next, the yarns forming each of the warp layer 16, the first oblique yarn layer 20, and the second oblique yarn layer 24 will be described in detail. The warp yarns 14 and the oblique yarns 18 and 22 are both glass fiber bundles formed by bundling glass fibers that are reinforcing fibers and having a flat cross section. Therefore, each thread | yarn 14,18,22 has high tensile strength in each axial direction. The diameter of the glass fiber is preferably in the range of about 3 μm to about 25 μm, and preferably 10 μm to 13 μm. The number of converged glass fibers forming one yarn is about 800 to about 8000. Further, the thickness (count) of the fiber bundle is 200 g / km to 1200 g / km. The warp yarns 14 and the oblique yarns 18 and 22 can be formed of fibers such as carbon, aramid, and vinylon in addition to glass fibers.
[0015]
In addition, the layers 16, 20, and 24 that overlap one above the other are bonded with a thermoplastic resin. As exemplarily shown in the rightmost warp 14 of FIG. 1, each warp 14 is composed of glass fibers and heat-seal filaments 26 (shown in broken lines) extending along the glass fibers. Similarly, the oblique yarns 18 and 22 also extend so that the heat-sealing filaments extend along the glass fibers. The heat-sealing filament 26 is obtained by fiberizing a thermoplastic resin, and for example, nylon, polyester, or the like is employed.
[0016]
A nonwoven fabric 28 is laminated and bonded to the lower surface of the triaxial assembly fabric 12 described above. The nonwoven fabric 28 has a structure in which short fibers are irregularly arranged. Examples of the short fiber material include vinylon and polyester. The air permeability of the nonwoven fabric 28 is 150 cm ³ / (cm ² · s) to 800 cm ³ / (cm ² · s).
[0017]
As shown in FIG. 2, elliptical holes 28 a having the longitudinal direction (X direction) as a major axis are regularly formed in the nonwoven fabric 28. That is, in the nonwoven fabric 28 has a hole 28a is longitudinally equidistant vertical pitch P1, also formed in the lateral direction in a grid is equally spaced transverse pitch P _2. A hole 28a is also formed at the center position of each lattice. That is, the column of the vertical pitch P ₁ arranged at regular intervals in the hole 28a is, only the vertical pitch of a half pitch (P _1/2) with the displaced longitudinally, transversely of a half pitch (P _2/2) only They are shifted in the horizontal direction and arranged sequentially. Such holes 28a are formed so as to penetrate the nonwoven fabric 28 by punching or needle processing. By mechanically and intentionally forming the holes 28a aligned in this manner, that is, regularly arranged, the air permeability of the reinforcing sheet 10 can be improved while maintaining the smoothness of the surface. At the time of construction of the reinforcing sheet 10 to be described later, the air bleeding of the reinforcing sheet 10 is made uniform.
[0018]
Next, a method of bonding the triaxial assembly fabric 12 and the nonwoven fabric will be described with reference to FIG. As described above, the fusion yarns 26A and 26B are included in the lower portions of the oblique yarns 18 and 22, respectively. Accordingly, the oblique yarn 22 under the oblique yarn 18 is bonded to the oblique yarn 18 by the heat-sealing filament 26 </ b> A included in the oblique yarn 18 in the contact area 30 with the oblique yarn 18. Then, the respective oblique yarns 22 constituting the triaxial assembly fabric 12 are bonded to the contacting oblique yarns 18 in the contact region 30, whereby the first oblique yarn layer 20 and the second oblique yarn layer. 24 is bonded.
[0019]
Further, in the region other than the contact region 30 of the oblique yarn 18, that is, in the region of the portion not involved in the adhesion with the oblique yarn 22, the oblique yarn 22 does not exist under the oblique yarn 18. The oblique yarn 18 is elastically deformed and comes into contact with the nonwoven fabric 28. As a result, the heat-sealing filament 26A and the non-woven fabric 28 included in the lower part of the oblique yarn 18 are partially bonded, and the first oblique yarn layer 20 sandwiches the second oblique yarn layer 24 therebetween. The nonwoven fabric 28 is bonded. Similarly, the warp layer 14 is bonded to the first oblique yarn layer 20 and to the nonwoven fabric 28 with the first oblique yarn layer 20 and the second oblique yarn layer 24 interposed therebetween. Thus, the warp layer 16, the oblique yarn layer 20, and the oblique yarn layer 24 are bonded in this order from the top by the heat-sealing filaments 26, 26A, 26B included in the first warp yarn 14 and the oblique yarns 18, 22. In addition, the triaxial fabric 12 is bonded to the nonwoven fabric 28. Therefore, it is not necessary to separately prepare an adhesive other than the heat fusion filament 26 for bonding the triaxial assembly fabric 12 and the nonwoven fabric 28.
[0020]
Next, the reinforcement method which reinforces a building structure using the reinforcement sheet demonstrated above is demonstrated, referring FIG.
[0021]
First, the resin 34 for bonding the building structure 32 and the reinforcing sheet 10 is applied on the reinforcing surface 32a of the building structure 32 (step 1). As this resin, for example, alkali-resistant methyl methacrylate (MMA) is used. Then, for example, after the resin 34 is applied at 0.8 kg / m 2, the reinforcing sheet 10 is pasted thereon so that the braid 12 side contacts the reinforcing surface 32a of the building structure 32 (step 2). Thereafter, the reinforcing sheet 10 is pressed against the building structure 32 from the nonwoven fabric 28 side with a roller or the like (step 3). Thereby, the resin 34 applied on the reinforcing surface 32a penetrates into the reinforcing sheet 10, that is, the air is removed from the reinforcing sheet 10, and the degree of adhesion between the building structure 32 and the reinforcing sheet 10 is improved. . When this air venting is performed, the air in the reinforcing sheet 10 and the resin 34 are easily replaced by the holes 28a formed in the nonwoven fabric 28 described above, so that the resin 34 easily penetrates into the reinforcing sheet 10. can do.
[0022]
In this way, when the building structure 32 is reinforced using the reinforcing sheet 10, it is possible to reinforce the yarns 14, 18, and 22 of the triaxial assembly fabric 12 from three directions in the axial direction. Further, since the triaxial assembly fabric 12 and the nonwoven fabric 28 are adhered by the heat-sealing filaments 26, 26A, and 26B included in the yarns 14, 18, and 22, the adhesion between the triaxial assembly fabric 12 and the nonwoven fabric 28 is achieved. Therefore, the adhesive does not hinder the penetration of the resin 34 into the triaxial fabric 12. Furthermore, since the holes 28a are formed in the non-woven fabric 28 in a regular arrangement, the resin 34 easily penetrates sufficiently into the reinforcing sheet 10 and the adhesion of the reinforcing sheet 10 to the building structure 34 is improved. To do.
[0023]
Moreover, as another aspect of this embodiment, as shown in FIG. 5, the building structure 32 can also be reinforced with the reinforcement sheet | seat 10A using a 4-axis assembly fabric. The four-axis assemblage 40 is composed of a weft layer 44 in which a plurality of wefts 42 extending in the lateral direction (Y direction in the figure) are arranged on the lower surface of the triaxial assemblage 12 by the heat-seal filament 26. Furthermore, the laminated fabric is laminated. The weft yarn 42 has the same configuration as the warp yarn 14 and the oblique yarns 18 and 22 described above. This reinforcing sheet 10A has a high tensile strength not only in the axial direction of the warp yarn 14 and the oblique yarns 18 and 22, but also in the axial direction of the weft yarn 42, and the building structure 32 is reinforced from four directions. And the rigidity of the reinforcing sheet itself is improved.
[0024]
Further, the present invention is not limited to the above embodiment, and various modifications are possible. For example, the arrangement of the holes 28a formed in the nonwoven fabric 28 may be an arrangement that allows the reinforcing sheet to be uniformly vented, and may be a simple lattice arrangement, a honeycomb arrangement, or the like. Further, the shape of the hole 28a may be a perfect circle shape, a polygonal shape, or the like in addition to the elliptical shape.
[0025]
【The invention's effect】
The reinforcing sheet according to the present invention is a reinforcing sheet for reinforcing a building structure, in which a warp layer in which warps obtained by bundling a plurality of filaments are arranged in parallel and oblique yarns that are oblique to the warps are arranged in parallel. The first oblique yarn layer and the second oblique yarn layer in which the oblique yarns obliquely intersecting with the warp yarns from the opposite direction to the oblique yarns of the first oblique yarn layer are laminated. Strengthening adhesion to building structure because it is characterized by laminated fabric and non-woven fabric having a plurality of holes formed according to a predetermined rule, with irregular fibers arranged irregularly Can do.
[0026]
Further, the reinforcing method according to the present invention is a reinforcing method for reinforcing a building structure, the step of applying a resin to the building structure, and the reinforcing sheet from the top of the resin. A step of attaching the fabric side to the building structure side and a step of bleeding the reinforcing sheet attached to the building structure. Strength can be strengthened.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a reinforcing sheet according to an embodiment of the present invention.
FIG. 2 is a rear view of the reinforcing sheet shown in FIG.
3 is a view showing an adhesion region of a reinforcing sheet shown in FIG. 1. FIG.
FIG. 4 is a view showing an example of use of a reinforcing sheet according to an embodiment of the present invention.
FIG. 5 is a view showing another aspect of the reinforcing sheet according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10,10A ... Reinforcement sheet, 12 ... Triaxial braiding (weaving), 14 ... Warp, 16 ... Warp layer, 18 ... Oblique yarn, 20 ... First oblique yarn layer (first oblique yarn layer) , 22 ... oblique yarns, 24 ... second oblique yarn layer (second oblique yarn layer), 26, 26A, 26B ... heat fusion filament, 28 ... non-woven fabric, 28a ... hole, 32 ... building structure, 34 ... resin, 40 ... 4-axis braided fabric (braided fabric), 42 ... weft, 44 ... weft layer.

Claims (5)

A reinforcing sheet for reinforcing a building structure,
A warp layer in which warps formed by bundling a plurality of filaments are arranged in parallel, a first oblique yarn layer in which oblique yarns oblique to the warp are arranged in parallel, and the diagonal of the first oblique yarn layer A braided fabric in which a second oblique yarn layer in which oblique yarns obliquely intersecting with the warp yarns from the opposite direction to the opposite yarns are laminated,
Short fibers are arranged irregularly and laminated with a nonwoven fabric having a plurality of holes formed according to a predetermined rule ,
Each of the warp and the oblique yarn includes a heat-sealing filament,
The warp layer, the first oblique yarn layer, and the second oblique yarn layer are bonded to each other by the heat fusion filament,
The yarns of each of the warp layer, the first oblique yarn layer, and the second oblique yarn layer are elastically deformed in a portion where no other layer exists on the nonwoven fabric side, and contact with the nonwoven fabric, A reinforcing sheet that is bonded to the nonwoven fabric by the heat-sealing filament . The yarns of each of the warp layer, the first oblique yarn layer, and the second oblique yarn layer have a count of 200 g / km to 1200 g / km, and are juxtaposed at a pitch of 1 mm to 25 mm. The reinforcing sheet according to claim 1, wherein: The reinforcing sheet according to claim 1, wherein a weft layer in which wefts perpendicular to the warps are arranged in parallel is further laminated on the braid. Each of the warp, the oblique yarn and the weft includes a heat-sealing filament,
The warp layer, the first and second oblique yarn layers, and the weft layer are bonded to each other by the heat-sealing filament,
The reinforcing sheet according to claim 3, wherein the braided fabric and the non-woven fabric are bonded together by the heat-sealing filament. A reinforcing method for reinforcing a building structure, the step of applying a resin to the building structure;
From the top of the resin, attaching the reinforcing sheet according to any one of claims 1 to 4 such that the braided fabric side of the reinforcing sheet is on the building structure side;
And a step of bleeding the reinforcing sheet affixed to the building structure.

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