JP3553865B2 - Method of reinforcing steel structure and buffer layer for reinforcing steel structure - Google Patents

Description

【００８９】
【比較例１】
実施例１で用いたものと同一の試験体であって、何ら補強を施さなかったものについて、実施例１と同様の静的載荷試験を行った。結果を表２に示す。
【００９０】
緩衝材層を形成しなかった以外は、実施例１と同様の静的載荷試験を行った。結果を表２に示す。
【表２】

平成１５年１２月３日付で株式会社ＮＩＰＰＯコーポレーションの出願人名義変更届を提出し、平成１５年１２月４日付で株式会社ＮＩＰＰＯコーポレーションの代理人選任届を提出しました。
【図面の簡単な説明】
【図１】緩衝材層及び１層の強化繊維シート層を設けた本発明の補強方法の施工例を模式的に示す断面図である。
【図２】緩衝材層及び１枚の強化繊維プラスチック板を設けた本発明の補強方法の施工例を模式的に示す断面図である。
【図３】実施例１及び２において行った本発明の補強方法の適用及び補強効果の試験における載荷の態様を説明する模式図である。図３Ａは試験体を側面から見た立面図であり、図３Ｂは試験体を長さ方向に垂直な面に沿って切断した断面図である。図３中において、長さを示す数値の単位は全てｍｍである。
【図４】本発明の補強方法に用いる、強化繊維シートの例を示す斜視図である。
【図５】本発明の補強方法に用いる、強化繊維シートの別の例を示す斜視図である。
【図６】本発明の補強方法に用いる、強化繊維シートのさらに別の例を示す平面図である。
【図７】本発明の補強方法に用いる、強化繊維シートのさらに別の例を示す斜視図である。
【符号の説明】
４：たて方向の強化繊維糸条
５：よこ方向の補助糸
６：たて方向の補助糸
７：よこ方向の強化繊維糸条
８：支持体
９：バインダー
１０：固着部材
イ：炭素繊維糸条群
ロ：たて方向の補助糸群
ハ：よこ方向の補助糸群
１１，３１：鋼製構造物表面
１２，３２：プライマー層
１３，３３：緩衝材層
１４：下塗り層
１５：強化繊維シート
３５：繊維強化プラスチック板
１６：上塗り層
１７，３７：仕上げ層（保護層）
２１：試験体
２２：補強用の鋼板
２３：試験体底面
２４：緩衝材層
２５：強化繊維含有材料層（５層）
２６：支点[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steel structure such as a beam, a column, a chimney, and a pipe made of a reinforcing fiber-containing material such as a reinforcing fiber sheet and / or a fiber-reinforced plastic plate. Complement Strong method and use it For cushioning material layer Related.
[0002]
[Prior art]
In recent years, in steel structures such as existing steel buildings, structural members that cannot maintain the performance at the time of design due to deterioration due to aging of structural members and more excellent performance are required. Structures are beginning to be seen. Therefore, these structures are reinforced and repaired. Specifically, reinforcement for the purpose of improving seismic performance, repair for deterioration of structural members, reinforcement for the purpose of improving the functionality of structures, and the like are being implemented.
[0003]
As a reinforcing technique for such a steel structure, a reinforcing fiber-containing material such as a reinforcing fiber sheet and / or a fiber-reinforced plastic plate is attached to the surface of the steel structure, and the reinforcing fiber-containing material and the steel structure are combined. Can be considered as a reinforcing method for integrating them.
[0004]
In a steel structure subjected to such a reinforcing method, a high reinforcing effect based on the reinforcing fiber-containing material can be obtained as long as the reinforcing fiber-containing material having high tensile strength and the steel structure are not easily broken. Obtainable. However, when a load is applied to the structure and deformation occurs, the reinforcing fiber-containing material separates before breaking, and the integrity of the reinforcing fiber-containing material and the steel structure is lost, thereby losing the reinforcing effect. Things are often destroyed.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a reinforcing fiber-containing material. layer A reinforcing fiber-containing material layer Material that can prevent peeling of reinforced fiber layer Sufficient reinforcement is easily performed by making full use of the strength of Of steel structures It is to provide a reinforcing method.
[0007]
[Means for Solving the Problems]
According to the present invention, a reinforcing fiber-containing material layer containing a matrix resin is provided on a surface of a steel structure via a buffer material layer. Integrally Including a providing step, wherein the buffer material layer has an elongation at a maximum tensile load at 23 ° C. of 10 to 200% and a tensile strength at 23 ° C. of 0.1 to 50 N / mm. ^Two Wherein the elongation of the cushioning material layer at the maximum tensile load is greater than the matrix resin contained in the reinforcing fiber-containing material layer.
[0008]
Further, according to the present invention, the cushioning material layer Contains 50 to 100% by mass of a resin and 0 to 50% by mass of a filler, and the resin has a tensile modulus at 23 ° C. of 0.1 to 50 N / mm when cured. ² And a method for reinforcing the steel structure.
[0009]
Furthermore, according to the present invention, the cushioning material layer The elongation at the maximum tensile load at 5 ° C. is 10 to 200%, and the tensile strength at 5 ° C. is 0.1 to 50 N / mm. ² Cushioning material layer And the resin has a tensile modulus at 5 ° C. of 0.1 to 50 N / mm when cured. ² And a method for reinforcing the steel structure.
[0010]
Furthermore, according to the present invention, it is used in the reinforcing method. Cushioning material layer Wherein the maximum tensile load elongation at 23 ° C. is 10 to 200% and the tensile strength at 23 ° C. is 0.1 to 50 N / mm. ² Cushioning material for reinforcing steel structures layer Is provided.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
In the reinforcing method of the present invention, a specific cushioning material is provided on the surface of the steel structure. layer Via reinforced fiber containing material layer Is provided.
[0012]
The cushioning material layer Examples of the material include a resin containing a resin such as a thermosetting resin and a thermoplastic resin, or a combination thereof. As the thermosetting resin, for example, an epoxy resin, a methyl methacrylate resin, a methacrylate resin, or a combination thereof can be used. As the thermoplastic resin, a nylon resin, a polycarbonate resin, a polyurethane resin, a polyethylene resin, a polypropylene resin, a combination thereof, or the like can be used.
The cushioning material layer When a resin is used as the material of the above, the tensile elastic modulus at 23 ° C. when the resin is cured alone is 0.1 to 50 N / mm. ² , More preferably 0.5 to 10 N / mm ² It is preferable to use a resin that is The tensile modulus can be measured according to JIS K7113.
The cushioning material layer The content of the resin therein can be 50 to 100% by mass, preferably 59 to 98% by mass, and more preferably 70 to 80% by mass.
[0013]
The cushioning material layer Is a cushioning material in addition to the resin layer In order to improve the work of applying to a structure by maintaining an appropriate viscosity range during formation or preventing sagging, etc., it contains a filler, a thixotropic agent and the like as appropriate within a range that does not impair the purpose of the present invention. You can also.
[0014]
Examples of the filler include carbon black, calcium carbonate, talc, silicic acid, silicate, lead white, lead red, graphite, titanium dioxide, strontium chromate, titanium yellow, and other pigments known as inorganic pigments. The cushioning material layer The content ratio of the filler therein may be 0 to 50% by mass, preferably 1 to 40% by mass, and more preferably 10 to 20% by mass.
[0015]
Examples of the thixotropic agent include organic ones and inorganic ones, and inorganic ones are preferable. Fumed silica, layered viscous mineral, swellable mica, synthetic smectite, bentonite, carbon black, hectorite, etc. Can be used.
[0016]
The cushioning material layer The content ratio of the thixotropic agent therein may be 0 to 50% by mass, preferably 1 to 40% by mass, and more preferably 10 to 20% by mass.
[0017]
The cushioning material layer Has a tensile maximum load elongation at 23 ° C. of 10 to 200%, preferably 10 to 100%. Further, the cushioning material layer Is a material containing reinforced fibers layer include matrix Material containing resin or reinforcing fiber layer It is particularly preferable to have an elongation at the time of the maximum tensile load larger than the matrix resin used for adhering. In addition, the cushioning material layer Has a tensile strength of 0.1 to 50 N / mm at 23 ° C. ² It is. The maximum tensile load elongation and the tensile strength of the cushioning material can be measured according to JIS K7113.
[0018]
The cushioning material layer By setting the elongation at the maximum tensile load at 23 ° C. and the tensile strength within the above ranges, the reinforcing fiber-containing material layer Prevents peeling of reinforced fiber-containing material layer To the maximum.
[0019]
The cushioning material layer Further, the elongation at the maximum tensile load at 5 ° C is 10 to 200%, and the tensile strength at 5 ° C is 0.1 to 50 N / mm. ² And the resin has a tensile modulus at 5 ° C. of 0.1 to 50 N / mm when the resin is cured alone. ² , Preferably 0.5 to 10 N / mm ² It is preferable that By using the buffer layer capable of maintaining the above-mentioned material characteristics even at a low temperature, a good reinforcing effect can be obtained even under a cold use condition.
A commercially available product can be used as the buffer material layer. For example, EE50, EE50W, EE60, and the like manufactured by Toho Earth Tech Co., Ltd. can be used.
[0020]
The cushioning material Layer material Can be provided as a layer on the surface of the steel structure directly or via another layer such as a primer layer provided as needed. Although the thickness of the layer is not particularly limited, it can be usually 100 to 2000 μm, preferably 200 to 1000 μm.
[0021]
The cushioning material layer may have a surface, that is, a reinforcing fiber-containing material, if necessary. layer The surface on the side is modified by physical or chemical treatment, layer And the adhesiveness with the adhesive can be improved. Examples of the physical treatment include polishing, roughening with sandpaper, or ultrasonic treatment, and examples of the chemical treatment include a method of partially oxidizing the surface and adding a functional group. . More specifically, for example, a corona treatment, a plasma treatment, an oxidizing agent treatment, and the like can be given. Layer material Is preferably a polyethylene resin, a polypropylene resin, or the like.
[0022]
The method of forming the buffer material layer includes: (i) a liquid buffer material layer A method in which the raw material is applied on the surface to be formed and then cured, or (ii) the cushioning material is formed into a shape such as a film. layer And the like.
[0023]
When the buffer material layer is formed by the method (i), the buffer material layer As a raw material of the above, a material exhibiting the above-described specific tensile elongation at maximum load and tensile strength when cured is used. Specifically, for example, those made of the various thermosetting resins and thermoplastic resins listed above, or those obtained by adding the filler, the thixotropic agent and the like to these can be used. As such a resin, a thermosetting resin, in particular, a thermosetting resin having a room temperature curability is preferable because of good workability. Further, a two-component mixed type resin is also preferable.
[0024]
Cushioning material layer When using a material containing a room-temperature-curable thermosetting resin as a raw material, a pot life at 20 ° C. is preferably 30 minutes to 5 hours, and more preferably 30 minutes to 2 hours in terms of workability. . Further, a coating film curing time at 20 ° C. is preferably from 1 hour to 24 hours, and more preferably from 1 hour to 12 hours in terms of working steps. Cushioning material layer It is desirable that the design strength development time of the material at 20 ° C. is usually 1 to 20 days, preferably 1 to 7 days. Cushioning material layer The raw material has a viscosity of usually 50 to 1,000,000 mPa · s, preferably 5000 to 300,000 mPa · s at 20 ° C. according to JIS K6833 measurement method, which is desirable for coating operation.
[0025]
The cushioning material layer The application of the raw material is a cushioning material Layer raw material With a roller brush, rubber spatula, gold iron, etc., cushioning material layer Can be carried out by uniformly coating such that the thickness is usually 100 to 2000 μm, preferably 200 to 1000 μm.
[0026]
Coated cushioning material layer Curing of the raw material, when containing a thermosetting resin, can be performed by heating to a curing temperature with a hot roll or a drier after application to the surface of the structure, particularly including a room temperature curable thermosetting resin In this case, it can be cured simply by leaving it at room temperature for the above-mentioned design strength developing time.
[0027]
When the buffer material layer is formed by the method (ii), the buffer material Layer raw material It is preferable to use a thermoplastic resin or a flexible thermosetting resin. The molded cushioning material layer Is preferably 100 to 2000 μm, particularly preferably 200 to 1000 μm. The molded cushioning material layer Any known method can be used as appropriate as a method for attaching the adhesive, for example, fusion by heat, adhesion by an adhesive, or the like can be used. As the adhesive, it is preferable to use an adhesive that can be adhered with an adhesive strength equal to or higher than the strength of the buffer material layer. Layer material It is preferable to use the same material as that described above.
[0028]
The reinforcing fiber-containing material used in the reinforcing method of the present invention layer Contains reinforcing fibers. Examples of the reinforcing fibers include carbon fibers, glass fibers, ceramic fibers, aramid fibers, silicon carbide fibers, and combinations thereof. In particular, carbon fibers are preferred because they are lightweight and have corrosion resistance. As the carbon fiber, pitch-based carbon fiber, PAN-based carbon fiber, or a combination thereof can be used.
When a carbon fiber having a high elastic modulus is required, a pitch-based carbon fiber such as Nippon Graphite Fiber XN60 is usually used, and when a high strength is required, usually a Toray T700SC, Toho Rayon UT500, Mitsubishi Rayon TR30 For example, polyacrylonitrile-based carbon fibers are used.
[0029]
The reinforcing fibers may be a two-dimensional woven fabric, a unidirectional woven fabric, a unidirectional material, or the like, as the reinforcing fiber-containing material. layer It can be provided inside.
[0030]
The reinforcing fiber-containing material layer Specifically, Including reinforced fiber sheet and matrix resin A fiber reinforced plastic plate can be used.
The reinforcing fiber Sheet Is usually 100 to 800 g / m ² Preferably, the reinforcing fiber Thread The number of filaments per bundle is preferably 1,000 to 10,000, and the tensile strength is 2,000 to 5,000 N / mm. ² , Tensile modulus 200-100 × 10 ³ N / mm ² Are preferred.
[0031]
As the reinforcing fiber sheet, specifically, for example, one of the warp and the weft is the reinforcing fiber, and the other is a thermoplastic resin-containing fiber (a fiber made of a thermoplastic resin, or a thermoplastic resin or a thermosetting fiber. A cross-shaped sheet in which the warp and the weft are fixed by the thermoplastic resin in the thermoplastic resin-containing fiber, or the reinforcing fibers are arranged in one direction. Further, a sheet or the like in which a mesh-like lattice containing a thermoplastic resin is overlapped, and these are fixed by the thermoplastic resin in the thermoplastic resin-containing fibers can be used.
[0032]
The reinforcing fiber Sheet Examples thereof include those in which many reinforcing fiber yarns are arranged in parallel. In particular, those specifically described below can be mentioned.
[0033]
For example, reinforcing fibers such as those shown in FIG. 4 in which the reinforcing fiber yarns are arranged in the warp direction, and auxiliary yarns are arranged in the weft direction so as to cross the reinforcing fiber yarns. Sheet Can be mentioned. In FIG. 4, the reinforcing fiber yarns 4 are arranged in parallel in the warp direction and intersect with the weft-direction auxiliary yarns 5 to form a unidirectional reinforcing fiber fabric.
[0034]
Further, for example, as shown in FIG. 5, the reinforcing fiber yarn constitutes a yarn group without substantially bending, and a weft direction auxiliary crossing the reinforcing fiber yarn on both sides of the yarn group. A reinforcing fiber in which a yarn group is located, and the weft direction auxiliary yarn group and the warp direction auxiliary yarn group parallel to the reinforcing fiber yarn group form a woven structure and integrally hold the reinforcing fiber yarn group. Sheet Can also be mentioned. In FIG. 5, the yarn group C of the weft assisting yarn 5 is provided on both sides of the sheet surface of the yarn group A in which the reinforcing fiber yarns 4 having substantially no bending are aligned in one direction in parallel with each other in a sheet shape. The weft auxiliary yarn group and the yarn group B of the warp direction auxiliary yarn 6 parallel to the reinforcing fiber yarn group form a woven structure to hold the yarn group integrally, and the unidirectional reinforcing fiber Forming a woven fabric.
[0035]
Further, for example, a sheet that is a bidirectional reinforced fiber fabric, such as that shown in FIG. Raise You can also In FIG. 6, a large number of reinforcing fiber yarns 4 are arranged in parallel in the warp direction, and also in the weft direction, the reinforcing fiber yarns 7 are arranged in parallel so as to be orthogonal to the reinforcing fiber yarns 4 in the warp direction. Thus, a bidirectional reinforcing fiber fabric is formed. With the reinforcing fiber yarn 4 in the warp direction and the reinforcing fiber yarn 7 in the weft direction Is exchange Interlaced with each other to form a flat organization.
[0036]
Further, for example, a sheet formed by bonding the reinforcing fiber yarn to a support with a binder, such as the one shown in FIG. Raise You can also In FIG. 7, a large number of reinforcing fiber yarns 4 are arranged in parallel in the warp direction, and these reinforcing fiber yarns are bonded to a mesh-shaped support member 8 located on one side thereof by a binder 9. I have. The material of the binder is not particularly limited, but may be the same as the material of the matrix resin described later. The adhesion amount of the binder can be 3 to 7 parts by weight based on 100 parts by weight of the reinforcing fiber.
[0037]
Various types of reinforcing fibers Sheet In the example, the reinforcing fiber yarn 4 may be fixed to the auxiliary yarn 5 by a fixing member 10 made of a low melting point polymer or the like. No. Previous The material of the low melting point polymer is not particularly limited, and examples thereof include nylon, copolymerized nylon, polyester, vinylidene chloride, vinyl chloride, polyurethane, and combinations thereof. Particularly, copolymerized nylon is preferable.
[0038]
The material of the auxiliary yarn 5 is preferably glass fiber.
[0039]
As the fiber-reinforced plastic plate, the reinforcing fibers in the form of a two-dimensional woven fabric, a one-way woven fabric, a one-way material, etc. Sheet To matrix A material obtained by impregnating a material containing a resin and curing by heating to form a plate can be used.
[0040]
As the matrix resin contained in the fiber reinforced plastic plate, a thermosetting resin, a thermoplastic resin, a combination thereof, or the like can be used. As the thermosetting resin, an epoxy resin, a methyl methacrylate resin, a methacrylate resin, or a combination thereof can be used.As the thermoplastic resin, a nylon resin, a polycarbonate resin, a polyurethane resin, a polyethylene resin, a polypropylene resin, or a mixture thereof. Combinations and the like can be used, but those having good adhesion are desirable.
[0041]
In the reinforcing method of the present invention, the reinforcing fiber-containing material layer Is the cushioning material layer And on the surface of the steel structure. Here, the reinforcing fiber-containing material layer Is the cushioning material layer It may be provided directly on the surface, or may be provided via another layer such as an undercoat layer as needed. Further, in the reinforcing method of the present invention, the reinforcing fiber-containing material Tier On top of this, if necessary, another layer such as an overcoat layer and a finishing layer can be provided. Specifically, If the strength of the reinforcing fiber-containing material layer Matrix resin as a subbing layer prior to application of Fat After applying and reinforcing fiber sheet, matrix tree Fat By applying, a layer in which the reinforcing fiber sheet and the matrix resin are composited is formed, and high strength can be obtained. In addition, reinforcing fiber-containing materials layer When using a fiber reinforced plastic plate as the layer A fiber reinforced plastic plate can be attached to the surface.
[0042]
The reinforcing fiber-containing material Tier Is not particularly limited. Further, as the reinforcing fiber-containing material layer, those having an elongation at break of preferably 0.5 to 3.0%, particularly preferably 0.6 to 2.0 can be used.
[0043]
Examples of the steel structure to which the reinforcing method of the present invention is applied include, but are not particularly limited to, various structures such as columns, beams, chimneys, and pipes, and include not only existing buildings but also factories and the like. Includes structures before building, such as steel bars, steel pipes, etc. In addition, in the present invention, the term “reinforcement” includes not only the reinforcement of a steel structure that has not deteriorated, but also the repair of a steel structure that has deteriorated.
[0044]
As a concrete construction method of the reinforcing method of the present invention, on the surface of the steel structure, the primer layer, the buffer Material layer , The undercoat layer, the reinforcing fiber-containing material Tier , An overcoat layer, a finishing layer, and the like. Among these layers, the cushioning material layer and the reinforcing fiber-containing material layer are indispensably formed, and the other layers can be formed as necessary. The formation of each of these layers can usually be formed in order from the layer close to the surface of the steel structure, but the cushioning material layer and Strengthen It can also be performed by forming a composite containing the fiber-containing material layer in advance and attaching it to the surface of the steel structure.
[0045]
Reinforcing fiber sheet as the reinforcing fiber-containing material layer layer An example of the reinforcing method of the present invention when using the method will be described in more detail below with reference to the construction example shown in FIG.
[0046]
First, if necessary, a pretreatment such as cleaning is performed on the surface 11 of the steel structure.
[0047]
As the washing method, a method of removing with a disk sander, sand blast, high pressure washing, rag, organic solvent or the like can be used.
[0048]
After performing the washing or the like as necessary, the reinforcing fiber-containing material as necessary layer Can be performed for reference such as a pasting position.
[0049]
Next, a step of applying a primer to the surface of the structure with a roller brush or the like, drying the primer, and forming a primer layer 12 is performed.
[0050]
As the primer, those having good adhesion to the surface of the structure and the buffer material layer, for example, a solvent type epoxy resin or a solventless type epoxy resin can be used. The mixing viscosity of the primer at 20 ° C. is generally from 1 to 10,000 mPa · s, preferably from 10 to 5000 mPa · s, from the viewpoint of workability.
[0051]
The use temperature at the time of applying the primer is usually preferably from -10 ° C to 50 ° C. The coating amount of the primer is usually 0.01 to 1 kg / m ² , Preferably 0.1 to 0.5 kg / m ² It is desirable that
[0052]
The time for drying the primer is generally 1 to 24 hours, preferably 1 to 12 hours at 20 ° C.
[0053]
After forming the primer layer 12, a buffer material layer 13 is formed thereon by the above-described method and the like. layer The surface is modified by physical or chemical treatment, and then, if necessary, a step of applying a matrix resin material or the like as the undercoat layer 14 is performed.
[0054]
As the matrix resin material, a thermosetting resin, a room temperature curable resin, or a material containing a combination thereof can be used, but a material containing a room temperature curable resin is preferable in view of workability. As the thermosetting resin, an epoxy resin, a methyl methacrylate resin, a methacrylate resin, or a combination thereof can be used.As the thermoplastic resin, a nylon resin, a polycarbonate resin, a polyurethane resin, a polyethylene resin, a polypropylene resin, or a mixture thereof. Combinations and the like can be used, but those having good adhesion to the cushioning material are desirable.
[0055]
The matrix resin material contains, in addition to the resin, a filler, a thixotropic agent and the like as appropriate within a range that does not impair the purpose of the present invention, in order to maintain an appropriate viscosity range during application or to prevent sagging. You can also.
[0056]
Examples of the filler include carbon black, calcium carbonate, talc, silicic acid, silicate, lead white, lead red, graphite, titanium dioxide, strontium chromate, titanium yellow, and other pigments known as inorganic pigments.
[0057]
Examples of the thixotropic agent include organic ones and inorganic ones, and inorganic ones are preferable. Fumed silica, layered viscous mineral, swellable mica, synthetic smectite, bentonite, carbon black, hectorite, etc. Can be used.
[0058]
The content ratio of the filler and / or the thixotropic agent in the matrix resin material is preferably 1 to 20% by mass.
[0059]
When the matrix resin material containing the cold-setting resin is used, a pot life at 20 ° C. is preferably 30 minutes to 5 hours, and more preferably 30 minutes to 2 hours in view of workability. Further, a coating film curing time at 20 ° C. is preferably from 1 hour to 24 hours, and more preferably from 1 hour to 12 hours in terms of working steps.
[0060]
It is desirable that the matrix resin material has a design strength developing time at 20 ° C. of usually 1 to 20 days, preferably 1 to 7 days. Further, the viscosity is preferably from 10 to 100,000 mPa · s at 20 ° C., and more preferably from 100 to 50,000 mPa · s, because of good impregnation and defoaming properties.
[0061]
In the step of applying the matrix resin material as the undercoat layer, the matrix resin material is applied with a roller brush or a rubber spatula, and the application amount is usually 0.1 to 2 kg / m. ² , Preferably 0.2-1 kg / m ² Can be carried out by applying the solution uniformly so as to fall within the range of (1).
[0062]
Next, a step of attaching the reinforcing fiber sheet 15 to the undercoat layer 14 is performed. In this step, immediately after the application of the undercoat layer 14, the reinforcing fiber sheet is adhered along the inking position, and preferably the surface of the sheet is in the reinforcing fiber direction, and more preferably the reinforcing fiber direction is from the center to the end of the sheet. By rubbing with a rubber spatula, a hot roll, a defoaming roll, or the like, impregnating the matrix resin material into the reinforcing fibers, and expelling the air in the reinforcing fibers to finish it smoothly.
[0063]
In the step of attaching the reinforcing fiber sheet 15, if the sheet is too long, it is difficult to perform the operation. Therefore, the reinforcing fiber sheet can be cut into an appropriate length, and can be joined together. In this case, in order to secure the strength, it is preferable that the overlapped portion is attached so as to overlap by 100 mm or more in the direction in which the strength is secured.
[0064]
Next, a step of applying a matrix resin material or the like as the overcoat layer 16 on the reinforcing fiber sheet is performed. In this step, the same matrix resin material as that used in the above-mentioned undercoating step is used, and usually 0.05 to 2 kg / m2 with a roller brush or a rubber spatula. ² , Preferably 0.1 to 1 kg / m ² Can be carried out by uniformly applying the coating amount.
[0065]
In each of the above steps, it is preferable to correct the fiber immediately after swelling, wrinkling, warping, or the like occurs. In addition, it is preferable to sufficiently perform protection from adhesion of dirt, rainfall, and the like.
[0066]
Finally, a finishing process is performed. This step can be performed by applying a weather-resistant paint such as urethane resin or fluororesin or a polymer cement-based material on the overcoat layer to form the protective layer 17.
[0067]
In the construction example described above, only one layer of the reinforcing fiber sheet is provided, but in the reinforcing method of the present invention, two or more layers of the reinforcing fiber sheet may be provided. The reinforcing fiber sheet having two or more layers can be provided by repeating the undercoating step, the step of sticking the reinforcing fiber sheet, and the overcoating step as many times as necessary.
[0068]
Next, an example of the reinforcing method of the present invention when a fiber-reinforced plastic plate is used as the reinforcing fiber-containing material layer will be described with reference to a working example shown in FIG.
[0069]
First, similarly to the construction example shown in FIG. 1, after performing pretreatment of the surface 31 of the steel structure, blackening, formation of the primer layer 32, adjustment of unevenness of the layer surface, etc., as necessary. , A buffer material layer 33 is formed, layer After modifying the surface and applying an undercoat layer (not shown), the fiber-reinforced plastic plate 35 is attached to the surface of the cushioning material layer 33 using an adhesive, and a finishing layer ( By forming the protective layer 37, the reinforcing method of the present invention can be performed.
[0070]
As the adhesive for adhering the fiber reinforced plastic plate 35, it is preferable to use an adhesive such that the adhesive strength between the buffer material layer and the fiber reinforced plastic plate is sufficiently higher than the tensile strength of the buffer material.
[0071]
As the adhesive, those containing a resin such as a thermosetting resin and a room temperature curable resin can be used, but those containing a room temperature curable resin are preferable from the viewpoint of workability. As the thermosetting resin, an epoxy resin, a methyl methacrylate resin, a methacrylate resin, or a combination thereof can be used.As the thermoplastic resin, a nylon resin, a polycarbonate resin, a polyurethane resin, a polyethylene resin, a polypropylene resin, or a mixture thereof. Combinations and the like can be used. The adhesive, in addition to the resin, in order to maintain an appropriate viscosity range at the time of application or to prevent sagging, appropriately contain a filler, a thixotropic agent and the like within a range that does not impair the purpose of the present invention. You can also.
[0072]
Examples of the filler include carbon black, calcium carbonate, talc, silicic acid, silicate, lead white, lead red, graphite, titanium dioxide, strontium chromate, titanium yellow, and other pigments known as inorganic pigments.
[0073]
Examples of the thixotropic agent include organic ones and inorganic ones, and inorganic ones are preferable. Fumed silica, layered viscous mineral, swellable mica, synthetic smectite, bentonite, carbon black, hectorite, etc. Can be used.
[0074]
The content of the filler and / or the thixotropic agent in the adhesive is preferably 1 to 20% by mass.
[0075]
When using the adhesive containing the room-temperature-curable resin as the adhesive, the pot life at 20 ° C. is preferably from 30 minutes to 5 hours, more preferably from 30 minutes to 2 hours, from the viewpoint of workability. Further, a coating film curing time at 20 ° C. is preferably from 1 hour to 24 hours, and more preferably from 1 hour to 12 hours in terms of working steps.
[0076]
The adhesive is a roller brush or a rubber spatula, and the amount of application is usually 0.05 to 3 kg / m. ² , Preferably 0.2 to 2 kg / m ² Can be applied uniformly.
[0077]
In the construction example described above, only one layer of fiber reinforced plastic plate is provided, but in the reinforcing method of the present invention, two or more layers of fiber reinforced plastic plate can be provided. The two or more layers of the fiber reinforced plastic plate can be provided by repeating the step of attaching the fiber reinforced plastic plate with the adhesive as many times as necessary.
[0078]
【The invention's effect】
The reinforcing method according to the present invention comprises the steps of: layer Via reinforced fiber containing material layer The steel structure and the reinforcing fiber-containing material layer And reinforced fiber-containing material layer Material that can prevent peeling of reinforced fiber layer Sufficient reinforcement can be easily performed by making full use of the strength of the steel. Therefore, it can be applied to reinforcement and repair of existing steel structures such as columns, beams, chimneys, pipes, etc., and the strength and energy absorption performance of the structures can be improved.
[0080]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
[0081]
Embodiment 1
Buffer material on steel specimen layer And reinforced fiber sheet layer Was applied to the present invention, and the reinforcing method was tested.
[0082]
As a test body, an I-steel 21 for beams having dimensions of 200 mm × 100 mm × 2000 mm shown in FIG. 3 and having a loading point and a fulcrum part reinforced with a steel plate 22 having a thickness of 5.5 mm was used. An epoxy-based primer is applied over the entire bottom surface 23 of the test body to a length of 1600 mm (central portion) and a width to form a primer layer (not shown), and then an epoxy-based buffer material (epoxy resin, trade name) Toho Dite EE50, manufactured by Toho Earth Tech Co., Ltd., elongation at the maximum tensile load at 23 ° C. during curing of 95% (measured by JIS K7131), tensile strength 1.4 N / mm ² (Measured according to JIS K7131) 65% elongation at the maximum tensile load at 5 ° C, tensile strength 6.5 N / mm ² ) Is applied to a thickness of 500 μm to form a buffer layer 24, and a reinforcing fiber sheet 25 (trade name: HT300, manufactured by Mitsubishi Nisseki Co., Ltd.) is applied so that the direction of the reinforcing fibers is the longitudinal direction. Then, five layers were laminated and adhered using an epoxy-based room temperature curing resin.
[0083]
After curing for at least one week after the reinforcing fiber sheet was attached, a static loading test was carried out by applying a fulcrum 26 as shown in FIG. 3 and applying a monotonous load having a distance between the fulcrums of 1800 mm. Table 1 shows the measured breaking loads and maximum displacements.
[0084]
Embodiment 2
Buffer material on steel specimen layer And the reinforcing method of the present invention using a fiber-reinforced plastic plate was applied, and the reinforcing method was tested.
[0085]
The same I steel for beams as that used in Example 1 was used as a test body. As the fiber reinforced plastic plate, TU plate TYPE-S (trade name, manufactured by Mitsubishi Nisseki Co., Ltd.) was used.
[0086]
The same epoxy primer as that used in Example 1 was applied over the entire bottom surface of the test specimen to a length of 1600 mm (central portion) and a width to form a primer layer. , Trade name: Toho Dite EE50, manufactured by Toho Earth Tech Co., Ltd .; elongation at the time of hardening at 23 ° C. under tensile maximum load of 95% (measured by JIS K7131); tensile strength: 1.4 N / mm ² (Measured according to JIS K7131)) to form a buffer layer by applying a film thickness of 500 μm, and further apply the fiber-reinforced plastic plate to the fiber-reinforced plastic plate in the same manner as in Example 1 so that the direction of the reinforcing fibers is the longitudinal direction. Adhesion was made with an epoxy-based room-temperature curing resin, and five sheets were laminated and stuck.
[0087]
After curing for one week or more after attaching the fiber reinforced plastic plate, a monotonous load having a distance between fulcrums of 1800 mm was applied as shown in FIG. 3 and a static load test was performed.
[0088]
[Table 1]

[0089]
[Comparative Example 1]
The same static loading test as in Example 1 was performed on the same test piece used in Example 1 but without any reinforcement. Table 2 shows the results.
[0090]
The same static loading test as in Example 1 was performed except that the buffer layer was not formed. Table 2 shows the results.
[Table 2]

On December 3, 2003, the Company submitted a notification of the change of the applicant name of NIPPO Corporation, and on December 4, 2003, submitted a notification of the appointment of an agent of NIPPO Corporation.
[Brief description of the drawings]
Fig. 1 Buffer material layer And one-layer reinforced fiber sheet layer It is sectional drawing which shows typically the execution example of the reinforcement method of this invention provided with.
FIG. 2 Buffer material layer FIG. 2 is a cross-sectional view schematically showing an example of the application of the reinforcing method of the present invention provided with one reinforcing fiber plastic plate.
FIG. 3 is a schematic diagram illustrating a loading mode in a test of an application of the reinforcing method of the present invention and a reinforcing effect performed in Examples 1 and 2. FIG. 3A is an elevational view of the specimen viewed from the side, and FIG. 3B is a cross-sectional view of the specimen cut along a plane perpendicular to the length direction. In FIG. 3, the units of the numerical values indicating the length are all mm.
FIG. 4 is used in the reinforcing method of the present invention. Strong Synthetic fiber Sheet It is a perspective view which shows the example of.
FIG. 5 is a reinforcing fiber used in the reinforcing method of the present invention. Sheet It is a perspective view which shows another example of.
FIG. 6 is used in the reinforcing method of the present invention. Strong Synthetic fiber Sheet It is a top view which shows another example.
FIG. 7 is used in the reinforcing method of the present invention. Strong Synthetic fiber Sheet It is a perspective view which shows another example.
[Explanation of symbols]
4: Reinforcing fiber yarn in warp direction
5: Weft auxiliary yarn
6: Warp auxiliary yarn
7: Weft direction reinforcing fiber yarn
8: Support
9: Binder
10: fixing member
B: Carbon fiber thread group
B: Warp direction auxiliary yarn group
C: Weft direction auxiliary yarn group
11, 31: Steel structure surface
12, 32: primer layer
13, 33: cushioning material layer
14: Undercoat layer
15: Reinforced fiber sheet
35: Fiber reinforced plastic plate
16: Top coat layer
17, 37: Finishing layer (protective layer)
21: Specimen
22: Steel plate for reinforcement
23: Specimen bottom surface
24: cushioning material layer
25: Reinforcing fiber-containing material layer (5 layers)
26: fulcrum

Claims (15)

A step of integrally providing a reinforcing fiber-containing material layer containing a matrix resin on the surface of the steel structure with a buffer material layer interposed therebetween, wherein the buffer material layer has an elongation at a maximum tensile load at 23 ° C. of 10 -200%, the tensile strength at 23 ° C is 0.1-50 N / mm ² , and the elongation at the maximum tensile load of the buffer material layer is larger than the matrix resin contained in the reinforcing fiber-containing material layer. Characteristic method of reinforcing steel structures. The buffer material layer contains 50 to 100% by mass of a resin and 0 to 50% by mass of a filler, and the resin has a tensile modulus at 23 ° C. of 0.1 to 50 N / mm ² when cured. The method for reinforcing a steel structure according to claim 1, wherein the method is a resin. The buffer material layer is a buffer material layer having an elongation at a maximum tensile load at 5 ° C. of 10 to 200% and a tensile strength at 5 ° C. of 0.1 to 50 N / mm ² , and the resin is cured. 3. The method for reinforcing a steel structure according to claim ² , wherein the resin is a resin having a tensile modulus at 5 ° C. of 0.1 to 50 N / mm ² . The reinforcing method according to claim 1, wherein the thickness of the buffer material layer is 100 to 2000 μm. The reinforcing method according to any one of claims 1 to 4, wherein the reinforcing fiber-containing material layer includes a plurality of reinforcing fiber yarns arranged in parallel. The reinforcing method according to claim 5, wherein the reinforcing fiber yarns are arranged in the warp direction, and auxiliary yarns are arranged in the weft direction so as to cross the reinforcing fiber yarns. The reinforcing fiber yarns constitute a yarn group without being bent substantially, and a weft direction auxiliary yarn group that intersects with the reinforcing fiber yarns is located on both sides of the yarn group. 6. The reinforcing method according to claim 5, wherein the warp direction auxiliary yarn group parallel to the reinforcing fiber yarn group forms a woven structure and integrally holds the reinforcing fiber yarn group. The reinforcing method according to any one of claims 1 to 4, wherein the reinforcing fiber-containing layer includes a bidirectional reinforcing fiber fabric. The reinforcing method according to any one of claims 1 to 4, wherein the reinforcing fiber-containing material layer includes a sheet in which a reinforcing fiber thread is bonded to a support with a binder. The reinforcing method according to any one of claims 1 to 4, wherein the reinforcing fiber-containing material layer includes a sheet in which reinforcing fiber yarns orthogonal to each other are bonded by a fixing member. The reinforcing method according to claim 6 or 7, wherein the intersections of the reinforcing fiber yarns and the weft direction auxiliary yarns are bonded by a fixing member. 8. The reinforcing method according to claim 6, wherein the auxiliary yarn is a glass fiber. It is a buffer material layer used for the reinforcement method of any one of Claims 1-12, Comprising: Elongation at a maximum tensile load at 23C of 10-200%, and tensile strength at 23C of 0.1-50N. / Mm ² , a buffer layer for reinforcing a steel structure. The resin contains 50 to 100% by mass of a resin and 0 to 50% by mass of a filler, and the resin has a tensile modulus at 23 ° C. of 0.1 to 50 N / mm ² when cured. The cushioning material layer according to claim 13, wherein The buffer material layer has an elongation at maximum tensile load at 5 ° C. of 10 to 200% and a tensile strength at 5 ° C. of 0.1 to 50 N / mm ² , and the resin is cured at 5 ° C. cushioning layer as claimed in claim 14, wherein the tensile modulus is equal to or is a resin of 0.1~50N / mm ^2.

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