JP3415107B2 - Method for reinforcing concrete structure and reinforcing structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing concrete structures such as beams, columns, slabs, walls, chimneys, tunnels, and fume pipes using a reinforcing fiber-containing material such as a reinforcing fiber sheet and / or a fiber-reinforced plastic plate. , And used for it
That on the reinforcement structure.

[0002]

2. Description of the Related Art Recently, in existing concrete structures such as reinforced concrete buildings, structures that cannot maintain the performance at the time of design due to deterioration due to secular change of structural members, The structures that are needed are becoming more common. Therefore, these structures are being reinforced and repaired. Specifically, reinforcement for the purpose of improving the seismic performance, repair for deterioration of structural members, or reinforcement for the purpose of improving the functionality of structures have been implemented.

As a reinforcing technique for such a concrete 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 concrete structure, and the reinforcing fiber-containing material and the concrete structure are combined. Reinforcement methods that integrate the two have been generally adopted, and they have many achievements.

In a concrete structure subjected to such a reinforcing method, as long as the reinforcing fiber-containing material that is hard to break and has high tensile strength and the concrete structure are integrated, a high reinforcing effect based on the reinforcing fiber-containing material is obtained. Can be obtained. However, at the end of the structure, the reinforcing fiber-containing material peels off before breaking and loses the integrity of the reinforcing fiber-containing material and the concrete structure,
As a result, the reinforcing effect is lost and the structure is often destroyed.

In order to prevent the exfoliation of such a reinforcing fiber-containing material, conventionally, in addition to a reinforcing fiber-containing material for reinforcement, this reinforcing fiber-containing material is added to a concrete structure to further contain another reinforcing fiber. A method of fixing with a material, a method of fixing a reinforcing fiber-containing material on a concrete structure with an anchor, a metal plate, and the like have been proposed. However, even with these methods, it is difficult to easily perform sufficient reinforcement by maximizing the strength of the reinforcing fiber-containing material.

[0006]

The object of the present invention is to solve the above, the maximum in the method for reinforcing a concrete structure by reinforcing fiber-containing material layer, it is possible to prevent peeling of the reinforcing fiber-containing material layer, the strength possessed by the reinforcing fiber-containing material layer The object is to provide a reinforcing method that can be used only for a limited time and can easily perform sufficient reinforcing.

Another object of the present invention is to reinforce a concrete structure with a reinforcing fiber-containing material layer so as to maximize its strength without peeling and to easily perform sufficient reinforcement. and to provide a reinforcement structure of the concrete structure adapted.

[0008]

According to the present invention SUMMARY OF], on the surface of the concrete structure, through the loose衝材layer, Matori'
Including the step of providing a reinforcing fiber-containing material layer containing resin
The elongation of the cushioning material layer at a maximum tensile load of 23 ° C is 10 to
200%, tensile strength at 23 ℃ is 0.1-50N / mm ² , and
The elongation at maximum tensile load of the cushioning material layer includes the reinforcing fiber content.
Provided is a method for reinforcing a concrete structure, which is characterized by being larger than a matrix resin contained in a material layer .

[0009] According to the present invention, except for the concrete structure having a curved surface on the inner wall, a reinforcing structure for reinforcing the concrete structure, the maximum load during tensile elongation at 23 ° C. 10 to 200% Includes a buffer layer having a tensile strength of 0.1 to 50 N / mm ² at 23 ° C and a reinforcing fiber with a matrix resin
A material layer, and the elongation at maximum tensile load of the cushioning material layer,
Tensile of matrix resin contained in material layer containing reinforcing fiber
There is provided a reinforcing structure for a concrete structure, which is characterized by having an elongation at maximum load larger than that.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The reinforcing method of the present invention includes the step of providing a reinforcing fiber-containing material layer on the surface of a concrete structure through a specific cushioning material layer .

Examples of the material of the cushioning material layer include those containing a resin such as a thermosetting resin or a thermoplastic resin, or a combination thereof. As the thermosetting resin, for example, an epoxy resin, a methylmethacrylate resin, a methacrylate resin, or a combination thereof can be used. As the thermoplastic resin, nylon resin, polycarbonate resin, polyurethane resin, polyethylene resin, polypropylene resin, or a combination thereof can be used. When a resin is used as the material of the buffer material layer , it is 23 ° C when the resin is cured by the resin alone.
Tensile elastic modulus at 0.1 to 50 N / mm ² , more preferably
It is preferable to use a resin that is 0.5 to 10 N / mm ² . The tensile modulus can be measured according to JIS K7113. The content ratio of the resin in the cushioning material layer is 50 to 100.
Wt%, preferably 59-98 wt%, more preferably 70
It can be up to 80% by mass.

[0012] The buffer material layer, in addition to the resin, in order to improve the coating operation to a structure such as by preventing sagging or maintaining appropriate viscosity range when the buffer material layer is formed, the present invention A filler, a thixotropic agent, and the like may be appropriately contained within a range that does not impair the purpose. Further, the addition of the filler slightly lowers the elongation at the maximum tensile load, but can also improve the tensile strength and the tensile elastic modulus of the cushioning material layer .

Examples of the filler include carbon black, calcium carbonate, talc, silicic acid, silicate, lead white known as an inorganic pigment, red lead, yellow lead, titanium dioxide, strontium chromate, titanium yellow, and other pigments. To be The content ratio of the filler in the cushioning material layer may be 0 to 50% by mass, preferably 1 to 40% by mass, and more preferably 10 to 20% by mass.

The thixotropic agent includes organic and inorganic ones, preferably inorganic ones such as fumed silica, layered clay mineral, swelling mica, synthetic smectite, bentonite, carbon black, Hectorite or the like can be used.

The content of the thixotropic agent in the buffer layer may be 0 to 50% by mass, preferably 1 to 40% by mass, more preferably 10 to 20% by mass.

The elongation of the cushioning material layer at a maximum tensile load at 23 ° C. is 10 to 200%, preferably 10 to 100%. Dripping may be a problem when applied to the surface of a concrete structure, and in that case, it may be possible to solve the dripping by making the elongation at maximum tensile load smaller. Further, the cushioning material layer is included in the reinforcing fiber-containing material layer.
It is particularly preferable to have a tensile elongation at maximum load larger than that of the matrix resin used for attaching the matrix resin or the reinforcing fiber-containing material layer . The tensile strength of the buffer material layer is 0.1 to 50 N / mm ² at 23 ° C. The elongation and tensile strength of the cushioning material under the maximum tensile load are JIS K711
It can be measured according to 3.

The elongation and the tensile strength of the cushioning material layer at 23 ° C. under the maximum tensile load, and when the cushioning material layer contains a resin, the tensile elastic modulus of the resin at 23 ° C. should be within the above range. Thereby, peeling of the reinforcing fiber-containing material layer can be prevented, and the strength of the reinforcing fiber-containing material layer can be utilized to the maximum.

The cushioning material layer further has an elongation at 5 ° C. under a tensile maximum load of 10 to 200%, more preferably 10 to 100%,
The tensile strength at 5 ° C is preferably 0.1 to 50 N / mm ² . When the buffer material layer contains a resin, the tensile modulus at 5 ° C when the resin is cured alone is 0.1 to 50 N / m.
It is preferably m ² , more preferably 0.5 to 10 N / mm ² . By using the cushioning material layer capable of maintaining the above-mentioned material characteristics even at a low temperature, a good reinforcing effect can be obtained even under cold use conditions. The cushioning material
A commercial item can be used as a layer . For example, EE50, EE50W, EE60 manufactured by Toho Earthtech Co., Ltd. can be used.

The material of the cushioning material layer can be provided as a layer on the surface of the concrete structure directly or through another layer such as a primer layer provided as necessary. The layer thickness is not particularly limited, but is usually 100 to 200.
The thickness can be 0 μm, preferably 200 to 1000 μm.

[0020] The buffer material layer is optionally modified by physical or chemical treatment of the surface of the surface or the reinforcing fiber-containing material layer side, to improve the adhesion between the reinforcing fiber-containing material layer it can. Examples of the physical treatment include polishing, roughening with sandpaper, or ultrasonic treatment. Examples of the chemical treatment include a method of partially oxidizing the surface and adding a functional group. . More specifically, for example corona treatment, a plasma treatment, there may be mentioned an oxidizing agent treatment, etc. These processes are especially the buffer material layer
The material can be preferably applied when the material is polyethylene resin, polypropylene resin or the like.

As the method of forming the buffer material layer, (i) a method of applying a liquid material for the buffer material layer onto the surface to be formed and then curing it, or (ii) molding into a film shape or the like The method of attaching the said buffer material layer etc. can be mentioned.

When the cushioning material layer is formed by the method (i), the cushioning material layer is made of a material which exhibits the above-mentioned specific maximum tensile load elongation and tensile strength when cured. Specific examples thereof include various thermosetting resins and thermoplastic resins listed above, or those obtained by adding the above-mentioned filler, thixotropic agent and the like. As such a resin, a thermosetting resin, particularly a room temperature curable thermosetting resin is preferable because it has good workability. A two-liquid mixed type resin is also preferable.

When a material containing a room temperature curable thermosetting resin is used as the raw material of the buffer material layer, the one having a pot life at 20 ° C. is preferably 30 minutes to 5 hours, more preferably 30 minutes to 2 hours. It is desirable in terms of workability. Further, the coating film curing time at 20 ° C. is preferably 1 hour to 24 hours, more preferably 1 hour to 12 hours from the viewpoint of the working process. The design strength development time of the raw material of the buffer material layer is usually 1 to 20 days, preferably 1 to 7 days at 20 ° C. The viscosity of the material of the buffer material layer is 20 ° C according to JIS K6833 measurement method.
Is usually 50 to 100,000 mPa · s, preferably 5000 to 300
000 mPa · s is desirable for coating work.

The coating of the material of the buffer material layer, the buffer material layer
It can be carried out by applying the raw material uniformly with a roller brush, a rubber spatula, a gold soldering iron or the like so that the thickness of the cushioning material layer is usually 100 to 2000 μm, preferably 200 to 1000 μm.

The curing of the material of the applied buffer material layer, when containing a thermosetting resin can be carried out by heating to the curing temperature by heat roll or dryer after the coating on the structure surface, in particular cold-curing In the case of containing a heat-curable resin, it is possible to cure the resin by simply leaving it at room temperature for the above design strength development time.

When the cushioning material layer is formed by the method (ii), it is preferable to use a thermoplastic resin or a flexible thermosetting resin as a raw material of the cushioning material layer . The thickness of the molded cushioning material layer is usually 100 to 2000 μm, especially 20.
The thickness is preferably 0 to 1000 μm. As a method of attaching the molded cushioning material layer , a generally known method can be appropriately used, and for example, fusion by heat, adhesion by an adhesive, or the like can be used. As the adhesive, it is preferable to use one that can adhere the cushioning material layer with an adhesive strength of concrete strength or higher. Specifically, for example, the same material system as that of the cushioning material layer is used. It is preferable.

The reinforcing fiber-containing material layer used in the reinforcing method of the present invention contains reinforcing fibers. As the reinforcing fiber,
Examples thereof include carbon fiber, glass fiber, ceramic fiber, aramid fiber, silicon carbide fiber, and combinations thereof. Particularly, carbon fiber is preferable because it is lightweight and has corrosion resistance. As the carbon fiber, pitch-based carbon fiber, PAN-based carbon fiber, or a combination thereof can be used. When the carbon fiber is required to have a high elastic modulus, a pitch-based carbon fiber such as XN60 manufactured by Nippon Graphite Fiber Co., Ltd. is usually used, and when high strength is required, it is usually T700SC manufactured by Toray.
T300, Toho Rayon UT500, Mitsubishi Rayon TR30
Polyacrylonitrile-based carbon fiber such as is used.

The reinforcing fibers can be provided in the reinforcing fiber-containing material as a two-dimensional woven fabric, a unidirectional woven fabric, a unidirectional fabric, or the like.

As the reinforcing fiber-containing material layer , specifically, a fiber-reinforced plastic plate containing a reinforcing fiber sheet and a matrix resin can be used. The basis weight of the reinforcing fiber sheet is usually preferably 100 to 800 g / m ² , and the number of filaments per bundle of reinforcing fiber yarn is
1000 to 10000 pieces are preferable, tensile strength is 2000 to 5000 N / mm
² , those having a tensile elastic modulus of 2 × 10 ⁵ to 1 × 10 ⁶ N / mm ² are preferable.

As the reinforcing fiber sheet, specifically, for example, one of the warp yarn and the weft yarn is the reinforcing fiber, and the other is a thermoplastic resin-containing fiber (a fiber made of a thermoplastic resin, or a thermoplastic fiber to any fiber). An auxiliary yarn made of a resin or a fiber to which a thermoplastic fiber is attached, wherein the warp yarn and the weft yarn are fixed to each other by the thermoplastic resin in the thermoplastic resin-containing fiber, or the reinforcing fiber It is possible to use a sheet or the like in which the mesh-like lattices containing a thermoplastic resin are stacked in a line in the direction, and these are fixed by the thermoplastic resin in the thermoplastic resin-containing fiber.

As the reinforcing fiber sheet , there may be mentioned one in which a large number of reinforcing fiber yarns are arranged in parallel. In particular, those specifically described below can be mentioned.

[0032] For example, such as that shown in FIG. 4, the arranged in longitudinal reinforcing fibers yarns direction, reinforcing fibers Sea auxiliary yarn are arranged in a laterally crossing the reinforcing fiber yarns
Mention may be made of the door. In FIG. 4, the reinforcing fiber yarns 4 are arranged in parallel in the warp direction and intersect with the auxiliary yarns 5 in the weft direction to form a unidirectional reinforcing fiber fabric.

Further, for example, the reinforcing fiber yarn, such as that shown in FIG. 5, constitutes a yarn group without being substantially bent, and intersects with the reinforcing fiber yarn on both sides of the yarn group. Reinforcement in which weft direction auxiliary yarn groups are located, and the weft direction auxiliary yarn groups and the warp direction auxiliary yarn groups parallel to the reinforcing fiber yarn group form a woven structure and integrally hold the reinforcing fiber yarn groups. fiber
You can also mention the sheet . In FIG. 5, the yarn group (a) of the yarn group (a) in which the reinforcing fiber yarns (4) having substantially no bending are arranged in parallel in one direction in parallel with each other in a sheet shape. Which are positioned in parallel with the weft auxiliary yarn group and the reinforcing fiber yarn group
The yarn groups (6) and (6) form a woven structure and hold the yarn groups together to form a unidirectional reinforcing fiber fabric.

[0034] Furthermore, for example, such as that shown in FIG. 6, may also be mentioned sheet is bidirectional reinforcing fiber fabric.
In FIG. 6, a large number of reinforcing fiber yarns 4 are arranged in parallel in the vertical direction, and the reinforcing fiber yarns 7 are also arranged in parallel in the horizontal direction so as to be orthogonal to the reinforcing fiber yarns 4 in the vertical direction. A bidirectional reinforcing fiber fabric is formed. Alternating interlacing the reinforcing fiber yarns 4 Toyoko direction of the reinforcing fiber yarns 7 in the longitudinal direction,
It forms a flat structure.

[0035] Furthermore, for example, such as that shown in FIG. 7, a sheet in which the reinforcing fiber yarns is adhered to the support in a binder may be elevation gel. In FIG. 7, a large number of reinforcing fiber yarns 4 are arranged in parallel in the vertical direction, and these reinforcing fiber yarns are bonded by a mesh-shaped support 8 and a binder 9 located on one side thereof. There is. The material of the binder is not particularly limited, but the same material as the material of the matrix resin described later can be used.
The amount of the binder attached may be 3 to 7 parts by weight based on 100 parts by weight of the reinforcing fiber.

In the examples of the various reinforcing fiber sheets described above,
Reinforcing fiber yarns 4, and the auxiliary yarn 5, but it may also have been fixed by fixing members 10 made of low-melting polymer. The material of the prior SL low melting point polymer is not particularly limited, nylon, copolymerized nylon, polyester, vinylidene chloride, vinyl chloride, polyurethane, or combinations thereof. Copolymerized nylon is particularly preferable.

The material of the auxiliary yarn 5 is preferably glass fiber.

The fiber-reinforced plastic plate is obtained by impregnating the reinforcing fiber sheet in the form of a two-dimensional woven fabric, a unidirectional fabric, a unidirectional material, etc. with a material containing a matrix resin, followed by heat curing to form a plate. Etc. can be mentioned.

As the matrix resin contained in the fiber reinforced plastic plate, a thermosetting resin, a thermoplastic resin, or a combination thereof can be used. The thermosetting resin may be an epoxy resin, a methylmethacrylate resin, a methacrylate resin, or a combination thereof, and the thermoplastic resin may be a nylon resin, a polycarbonate resin, a polyurethane resin, a polyethylene resin, a polypropylene resin, or a combination thereof. Combinations and the like can be used, but those having good adhesion are desirable.

In the reinforcing method of the present invention, the reinforcing fiber-containing material layer is provided on the surface of the concrete structure through the cushioning material layer . Here, the reinforcing fiber-containing material
The layer may be provided directly on the surface of the cushioning material layer , or may be provided via another layer such as an undercoat layer if necessary. Also,
The reinforcing method of the present invention, the reinforcing fiber-containing materials layer,
If necessary, other layers such as an overcoat layer and a finishing layer can be provided. Specifically, for example, by the matrix resins is applied as a subbing layer prior to the application of strengthening fibrous sheet of reinforcing fiber-containing material layer, applying a matrix resins as overcoat layer after application of the reinforcing fiber sheet,
High strength can be obtained by forming a layer in which the reinforcing fiber sheet and the matrix resin are combined. When a fiber-reinforced plastic plate is used as the reinforcing fiber-containing material layer ,
A fiber reinforced plastic plate can be attached to the surface of the cushioning material layer using an adhesive.

The thickness of the reinforcing fiber-containing materials layer is not particularly limited. Further, as the reinforcing fiber-containing material layer ,
The elongation at break is preferably 0.5 to 3.0%, particularly preferably 0.6 to 2.0 % .

The concrete structure to which the reinforcing method of the present invention is applied is not particularly limited, but various structures such as pillars, beams, slabs, walls, chimneys, tunnels, and fume pipes can be mentioned. Not only the building of the above, but also the structure before it becomes a building such as concrete parts produced in factories. Further, in the present invention, the reinforcement includes not only the reinforcement of the concrete structure which has not deteriorated but also the repair of the deteriorated concrete structure.

[0043] As a specific method of constructing the reinforcing method of the present invention, on the surface of the concrete structure, said primer layer, said buffer material layer, the undercoat layer, wherein the reinforcing fiber-containing materials, overcoat layers, A method of sequentially forming each layer such as a finishing layer can be mentioned. Among these layers, the cushioning material layer and the reinforcing fiber-containing material layer are indispensable, and the other layers can be formed as needed. The formation of each of these layers is
Usually, it can be formed in order from the layer closer to the surface of the concrete structure, but by forming a composite including a cushioning material layer and a reinforcing fiber-containing material layer in advance and applying it to the surface of the concrete structure. You can also do it.

An example of the reinforcing method of the present invention when a reinforcing fiber sheet layer is used as the reinforcing fiber-containing material layer will be described below more specifically with reference to the construction example shown in FIG.

First, if necessary, the surface 11 of the concrete structure is subjected to cleaning, polishing, and pretreatment such as a step using a base adjusting material and a defective portion.

As the cleaning method, a disk sander, sand blast, high pressure cleaning, a method of removing with a waste cloth, an organic solvent or the like can be used.

As the base adjusting material, a resin having a compressive strength equal to or higher than the concrete strength, such as putty-like epoxy resin or epoxy resin mortar, can be used. Pretreatment can be performed by filling these steps or the like with a step or a defective portion. In addition, in the pretreatment step, it is preferable to perform R finishing of the projected corner and the projected corner together.

After carrying out the above-mentioned washing, pretreatment, etc., if necessary, marking can be carried out, if necessary, for reference such as the sticking position of the reinforcing fiber-containing material layer .

Next, a step of forming a primer layer 12 by applying a primer on the surface of the structure with a roller brush or the like and drying it.

As the primer, one having good adhesion to the surface of the structure and the buffer layer, for example, solvent type epoxy resin or solventless epoxy resin can be used. From the viewpoint of workability, it is preferable that the mixed viscosity of the primer is usually 1 to 10000 mPa · s at 20 ° C., and preferably 10 to 5000 mPa · s.

The temperature at which the primer is applied is usually preferably -10 ° C to 50 ° C. The amount of the primer applied is usually 0.01 to 1 kg / m ² , preferably 0.1.
It is desirable to be 0.5 kg / m ² .

The time for drying the primer is 20 ° C.
It is desirable that the period is usually 1 to 24 hours, preferably 1 to 12 hours.

After the primer layer 12 is formed, if necessary, an unsteady adjusting material such as putty material is applied to adjust the unevenness of the surface of the layer, and then the cushioning material layer 13 is formed thereon. It is formed by a method or the like. At this time, instead of applying the unprepared material such as putty material, the cushioning material layer may be formed so as to adjust the unevenness of the layer surface. In this case, if necessary, the cushioning material layer may be used by containing the component of the uncontrollable material. Further, if necessary, the surface of the buffer material layer 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.

As the matrix resin material, a material containing a thermosetting resin, a room temperature curable resin, or a combination thereof can be used, but a material containing a room temperature curable resin is preferable from the viewpoint of workability. . The thermosetting resin may be an epoxy resin, a methyl methacrylate resin, a methacrylate resin, or a combination thereof, and the thermoplastic resin may be a nylon resin, a polycarbonate resin, a polyurethane resin, a polyethylene resin,
Polypropylene resin, a combination thereof, or the like can be used, but one having good adhesiveness with the cushioning material is desirable.

In addition to the above-mentioned resins, the above-mentioned matrix resin material is used in order to maintain an appropriate viscosity range at the time of coating and prevent sagging, so long as it does not impair the object of the present invention. Can also be included.

Examples of the filler include carbon black, calcium carbonate, talc, silicic acid, silicate, lead white known as an inorganic pigment, red lead, yellow lead, titanium dioxide, strontium chromate, titanium yellow, and other pigments. To be

The thixotropic agent includes an organic type and an inorganic type, but an inorganic type is preferable, and fumed silica, layered viscosity mineral, swelling mica, synthetic smectite, bentonite, carbon black, Hectorite or the like can be used.

The content of the filler and / or thixotropic agent in the matrix resin material is preferably 1 to 20% by mass.

When a material containing the room temperature curable resin is used as the matrix resin material, the pot life at 20 ° C. is preferably 30 minutes to 5 hours, more preferably 30 minutes.
Minutes to 2 hours are desirable in terms of workability. Also 20 ℃
The coating film curing time is preferably 1 hour to 24 hours, more preferably 1 hour to 12 hours from the viewpoint of working steps.

The design strength development time of the matrix resin material at 20 ° C. is usually 1 to 20 days, preferably 1 to 7 days. The viscosity is usually 10 at 20 ℃.
It is desirable that it is ˜100,000 mPa · s, preferably 100 to 50,000 mPa · s, since the impregnation property and the defoaming property are good.

In the step of applying the matrix resin material as the undercoat layer, the matrix resin material is applied with a roller brush, a rubber spatula, etc., and the application amount is usually 0.1 to ² kg / m ² .
It can be carried out by uniformly applying the solution in a range of preferably 0.2 to 1 kg / m ² .

Next, the reinforcing fiber sheet 15 is formed on the undercoat layer 14.
Is performed. In this step, the reinforcing fiber sheet is pasted along the marking position immediately after the application of the undercoat layer 14, 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. Along with a rubber spatula, a heat roll, a defoaming roll, etc. to impregnate the reinforcing fibers with the matrix resin , and expel air in the reinforcing fibers to finish the surface smoothly.

In the step of attaching the reinforcing fiber sheet 15, if the length of the sheet is too long, the work is difficult.
Reinforcing fiber sheets can be cut into appropriate lengths and spliced together. In this case, in order to secure the strength, it is preferable that the overlapping portions are attached so as to overlap each other by 100 mm or more in the direction of securing the strength.

Next, on the reinforcing fiber sheet, a step of applying the matrix resins such as overcoat layer 16. This process, using the one used in the undercoating step similar to matrix resins such as, typically 0 a roller brush or spatula or the like.
It can be carried out by uniformly applying a coating amount of 05 to ² kg / m ² , preferably 0.1 to 1 kg / m ² .

In each of the above steps, it is preferable to immediately correct any swelling, wrinkling, or twisting of the fibers. In addition, it is preferable to sufficiently protect from adhesion of dirt and rainfall.

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.

In the construction examples described above, only one layer of reinforcing fiber sheet was provided, but in the reinforcing method of the present invention, it is possible to provide two or more layers of reinforcing fiber sheet. 2
A reinforcing fiber sheet having more than one layer can be provided by repeating the undercoating step, the step of attaching the reinforcing fiber sheet, and the overcoating step as many times as necessary.

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 the construction example shown in FIG.

First, similar to the construction example shown in FIG. 1, if necessary, pretreatment of the surface 31 of the concrete structure, marking out, formation of the primer layer 32, adjustment of unevenness of the layer surface, etc. are performed. After that, a cushioning material layer 33 is formed, and after modifying the cushioning material layer surface and applying an undercoat layer (not shown) as necessary,
An adhesive is used to attach the fiber reinforced plastic plate 35 on the surface of the cushioning material layer 33, and a finishing layer is further formed thereon.
By forming the (protective layer) 37, the reinforcing method of the present invention can be performed.

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 cushioning material layer and the fiber reinforced plastic plate is sufficiently higher than the tensile strength of concrete.

As the adhesive, one containing a resin such as a thermosetting resin or a room temperature curable resin can be used, but one containing a room temperature curable resin is preferable from the viewpoint of workability. The thermosetting resin may be an epoxy resin, a methylmethacrylate resin, a methacrylate resin, or a combination thereof, and the thermoplastic resin may be a nylon resin, a polycarbonate resin, a polyurethane resin, a polyethylene resin, a polypropylene resin, or a combination thereof. Combinations etc. can be used. The adhesive contains, in addition to the resin, a filler, a thixotropic agent, and the like as appropriate in order to maintain an appropriate viscosity range at the time of application and prevent sagging, so long as the object of the present invention is not impaired. You can also

Examples of the filler include carbon black, calcium carbonate, talc, silicic acid, silicate, lead white known as an inorganic pigment, red lead, yellow lead, titanium dioxide, strontium chromate, titanium yellow, and other pigments. To be

The thixotropic agent includes organic and inorganic ones, preferably inorganic ones such as fumed silica, layered viscosity mineral, swelling mica, synthetic smectite, bentonite, carbon black, Hectorite or the like can be used.

The content of the filler and / or thixotropic agent in the adhesive is preferably 1 to 20% by mass.

When the adhesive containing the room temperature curable resin is used, the pot life at 20 ° C. is preferably 30 minutes to 5 hours, more preferably 30 minutes to 2 hours in view of workability. desirable. Further, the coating film curing time at 20 ° C. is preferably 1 hour to 24 hours, more preferably 1 hour to 12 hours from the viewpoint of the working process.

The adhesive is a roller brush or a rubber spatula, and the application amount is usually 0.05 to 3 kg / m ² , preferably 0.2 to ² kg.
It can be applied uniformly so as to be in the range of / m ² .

In the construction examples 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. Fiber-reinforced plastic plates with two or more layers
It can be provided by repeating the step of attaching the fiber-reinforced plastic plate with the adhesive as many times as necessary. The reinforcing structure of the present invention is a reinforcing structure that reinforces a concrete structure such as the concrete structure, and has a tensile maximum load elongation at 23 ° C. of 10 to 200% and 23 ° C.
A buffer material layer having a tensile strength of 0.1 to 50 N / mm ² and a reinforcing fiber-containing material layer. Here, the buffer material layer described above can be used as the buffer material layer . The reinforcing fiber-containing material layer may be the reinforcing fiber-containing material layer .

[0078]

Industrial Applicability The reinforcing method of the present invention comprises a reinforcing fiber-containing material on the surface of a concrete structure through a specific buffer layer.
Since a layer, are integrated with the concrete structure with the reinforcing fiber-containing material layer stable, it can prevent peeling of the reinforcing fiber-containing material layer, using the strength possessed by the reinforcing fiber-containing material layer to the maximum, sufficient Reinforcement can be easily performed. Therefore, it can be applied to reinforcement and repair of existing concrete structures such as columns, beams, slabs, walls, chimneys, tunnels, and fume pipes, and the ultimate strength and energy absorption performance of the structures can be improved.

[0079] This onset Ming reinforcing structure is to maximize their strength without peeling, it can be carried out easily enough reinforcement.

[0080]

The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited thereto.

[0081]

[Example 1] A reinforcing method of the present invention using a cushioning material layer and a reinforcing fiber sheet layer was applied to a concrete test piece in which main bars and stirrups were arranged, and its reinforcing effect was tested.

As a test piece, a length of 2200 mm and a width of 2 shown in FIG.
It has a size of 00 mm and a height of 200 mm, and SD29 of D13 as the main bar 22
A beam 21 having four 5 steel rods and having SD295 steel rods of D6 at 150 mm intervals as the stirrup 23 was used. The bottom surface 24 of this specimen, length 1740 mm (center portion), over the entire width, after forming a primer layer (not shown) by applying an epoxy-based primer,
Epoxy cushioning material (epoxy resin, trade name Tohodaito EE50, manufactured by Toho Earthtech Co., Ltd., elongation 95% at maximum tensile load at 23 ° C during curing (measured by JIS K7113), tensile strength 1.4N / mm ² (Measured by JIS K7113), elongation at maximum load at 5 ° C. of 65%, tensile strength of 6.5 N / mm ² ) is applied to a film thickness of 500 μm to form a buffer material layer 25,
Further reinforcing fiber sheet 26 (trade name: HT300, Nisseki Mitsubishi Corp.)
(Manufactured) was adhered and attached with an epoxy-based room temperature curable resin so that the direction of the single-layer reinforcing fiber was the main bar direction.

After curing the reinforcing fiber sheet layer for 1 week or more, a fulcrum 27 is applied as shown in FIG. 2, and a four-point monotonic load having a fulcrum distance of 1800 mm and a loading point distance of 300 mm is loaded,
A static loading test was conducted. Table 1 shows the measured fracture load, maximum displacement and maximum strain of the reinforcing fiber sheet, and the fracture mode of the reinforcing fiber sheet observed at the time of fracture. In addition, the strain distribution (relationship between the distance from the center of the specimen and strain) of the reinforcing fiber sheet was measured at the time when various loads were applied. The results are shown in Figure 8. Furthermore, Fig. 9 shows the relationship between the applied load and the displacement.

[0084]

[Example 2] The reinforcing method of the present invention using a cushioning material layer and a fiber reinforced plastic plate was applied to a concrete test piece in which main bars and stirrups were arranged, and the reinforcing effect was tested.

The same beam as that used in Example 1 was used as a test piece. As the fiber reinforced plastic plate, TU plate TYPE-S (trade name, manufactured by Nisseki Mitsubishi Corp.) was used.

The same epoxy-based primer as used in Example 1 was applied over the entire length, 1740 mm (central portion), and the entire width of the bottom surface of the sample to form a primer layer, and then an epoxy-based buffer material was used. (Epoxy resin, trade name "Tohodite EE50", manufactured by Toho Earthtech Co., Ltd., 95% elongation at maximum tensile load at 23 ° C during curing (JIS K7113
(Measured according to JIS K7113), tensile strength 1.4 N / mm ² (measured according to JIS K7113), elongation at tensile maximum load at 5 ° C of 65%, tensile strength 6.
5 N / mm ² ) is applied to form a buffer layer with a film thickness of 500 μm, and one fiber-reinforced plastic plate is used. It was attached by adhering it with an epoxy type room temperature curing resin.

After attaching the fiber reinforced plastic plate 1
After curing for more than a week, the distance between fulcrums is 1800m as shown in Fig. 2.
A static loading test was performed by loading a 4-point monotonic load with m and a distance between loading points of 300 mm. Table 1 shows the measured fracture load, maximum displacement and maximum strain of the reinforcing fiber sheet, and the fracture mode of the reinforcing fiber sheet observed at the time of fracture.

[0088]

[Example 3] A static load test was carried out in the same manner as in Example 1 except that the thickness of the buffer material layer was 1000 µm. The results are shown in Table 1 and FIG.

[Table 1]

[0089]

Comparative Example 1 The same test piece as that used in Example 1 but without any reinforcement was tested in Example 1
The same static load test was performed. The results are shown in Table 2 and FIG.

[0090]

Comparative Example 2 Example except that the cushioning material layer was not formed
The specimen was reinforced in the same manner as in 1, and a static load test was performed. The results are shown in Table 2 and FIGS. 9 and 10.

[0091]

[Comparative Example 3] As a cushioning material, a cushioning material layer of epoxy resin (elongation at maximum tensile load of 5% at 23 ° C (measured by JIS K7113), tensile strength 40 N / mm ² (measured by JIS K7113)) was formed. The specimen was reinforced in the same manner as in Example 1 except for the above, and a static load test was performed. The results are shown in Table 2.

[0092]

[Table 2]

[0093]

[Example 4] EE50W as a cushioning material (epoxy resin, trade name "Tohodite EE50W", manufactured by Toho Earthtech Co., Ltd., elongation at maximum tensile load at 23 ° C at curing 56% (J
IS K7113), Tensile strength 1.2N / mm ² (Measurement according to JIS K7113) Same as Example 1 except using 55% elongation at 5 ° C under maximum tensile load, and 5N / mm ² tensile strength. Then
The reinforcing method of the present invention was applied to the test piece and a static load test was performed. Table 1 shows the measured fracture load, maximum displacement and maximum strain of the reinforcing fiber sheet, and the fracture mode of the reinforcing fiber sheet observed at the time of fracture.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing a working example of the reinforcing method of the present invention in which a cushioning material layer and one reinforcing fiber sheet layer are provided.

[Fig. 2] Fig. 2 is a schematic diagram for explaining a mode of loading in the application of the reinforcing method of the present invention performed in Examples 1 and 2 and a test of the reinforcing effect. FIG. 2A is an elevation view of the test piece as seen from the side surface, and FIG. 2B is a cross-sectional view of the test piece taken along a plane perpendicular to the length direction. In FIG. 2, all units of numerical values indicating length are mm.

FIG. 3 is a cross-sectional view schematically showing a construction example of the reinforcing method of the present invention in which a cushioning material layer and one reinforcing fiber plastic plate are provided.

FIG. 4 is a perspective view showing an example of a reinforcing fiber sheet used in the reinforcing method of the present invention.

FIG. 5 is a perspective view showing another example of a reinforcing fiber sheet used in the reinforcing method of the present invention.

FIG. 6 is a perspective view showing still another example of a reinforcing fiber sheet used in the reinforcing method of the present invention.

FIG. 7 is a perspective view showing still another example of a reinforcing fiber sheet used in the reinforcing method of the present invention.

FIG. 8 is a graph showing measurement results of strain distribution of the reinforcing fiber sheet in Example 1.

9 is a graph showing the relationship between load and displacement in Example 1, Example 3, Comparative Example 1 and Comparative Example 2. FIG.

10 is a graph showing the measurement results of strain distribution of the reinforcing fiber sheet in Comparative Example 1. FIG.

[Explanation of symbols]

4: Reinforcing fiber yarn in the vertical direction 5: Weft direction auxiliary thread 6: Auxiliary thread in the vertical direction 7: Horizontal reinforced fiber yarn 8: Support 9: Binder 10: Fixed member B: Carbon fiber yarn group B: Auxiliary thread group in the vertical direction C: Auxiliary thread group in the weft direction 11,31: Surface of concrete structure 12,32: Primer layer 13,33: cushioning material layer 14: Undercoat layer 15: Reinforcing fiber sheet 35: Fiber reinforced plastic plate 16: Overcoat layer 17,37: Finishing layer (protective layer) 21: Beam 22: Main line 23: Belt 24: Bottom of beam 25: cushioning material layer 26: Reinforcement fiber-containing material layer 27: Support point

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mori Etsue 1-chome, Sakuragi-cho, Naka-ku, Yokohama-shi, Kanagawa 8 Nisseki Yokohama Building, Nisseki Ryoyu Engineering Ring Co., Ltd. (72) Inventor Hideyuki Komaki Kanagawa 8 Chidori-cho, Naka-ku, Yokohama Hishishi Mitsubishi Corporation Central Technology Research Institute (56) Reference JP-A-10-237742 (JP, A) JP-A-8-158665 (JP, A) JP-A-10-102792 (JP, A) JP-A-11-959 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04G 23/02

Claims (13)

(57) [Claims] To 1. A surface of the concrete structure, slow衝材
Reinforcement fiber-containing material containing matrix resin through layers
It looks including the step of providing a layer, tensile at 23 ° C. of the buffer material layer the outermost
Elongation under heavy load is 10-200%, tensile strength at 23 ℃ is 0.1-50
N / mm ² and elongation of the cushioning material layer under maximum tensile load
Is a matrix tree contained in the reinforcing fiber-containing material layer
A method for reinforcing a concrete structure characterized by being larger than fat . 2. The cushioning material layer has an elongation at maximum tensile load of 10 to 200% at 5 ° C. and a tensile strength of 0.1 to 50 N / mm ² at 5 ° C. reinforcing method claim 1 Symbol placement of the concrete structure. 3. The cushioning material layer contains 50 to 100 mass% of a resin and 0 to 50 mass% of a filler, and the resin has a tensile elastic modulus at 23 ° C. of 0.1 to 50 N / mm ² when cured. characterized in that it is a resin having a reinforcing method according to claim 1 or 2 Symbol placement of the concrete structure. 4. 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 elastic modulus at 5 ° C. of 0.1 to 50 N / mm ² when cured. The method for reinforcing a concrete structure according to any one of claims 1 to 3 , wherein the method is the resin according to any one of claims 1 to 3 . 5. The buffer material layer having a thickness of 100 to 2000 μm
According to any one of claims 1 to 4, characterized in that
Reinforcement method. Wherein said strong fiber-containing material layer, many present parallel
A contraction characterized by having reinforced fiber yarns arranged in a line
The reinforcing method according to any one of claims 1 to 5 . 7. The reinforcing fiber yarns are arranged in a vertical direction,
7. The reinforcing method according to claim 6, wherein the auxiliary yarns are arranged so as to intersect the reinforcing fiber yarns in the weft direction. 8. The reinforcing fiber yarns constitute a yarn group without being substantially bent, and a weft direction auxiliary yarn group intersecting with the reinforcing fiber yarns is located on both sides of the yarn group. 7. The reinforcing method according to claim 6, wherein the weft direction auxiliary yarn group and the warp direction auxiliary yarn group parallel to the reinforcing fiber yarn group form a woven structure to integrally hold the reinforcing fiber yarn group. 9. The reinforcing fiber-containing material layer is bidirectionally strong.
Reinforcement according to any one of claims 1 to 5, comprising a synthetic fiber fabric.
Method. 10. The reinforcing method according to claim 1, wherein the reinforcing fiber-containing material layer includes a sheet in which reinforcing fiber yarns are bonded to a support with a binder. 11. The reinforcing fiber yarn and the transverse direction auxiliary yarn
The intersection of the above is adhered by a fixing member.
Reinforcement method of loading. 12. The reinforcing method according to claim 7, wherein the auxiliary yarn is glass fiber . 13. A reinforcing structure for reinforcing a concrete structure excluding a concrete structure having a curved surface as an inner wall, wherein the elongation at maximum tensile load at 23 ° C. is 10 to 200%, 2
Tensile strength at 3 ° C. is 0.1~50N / mm ² and the buffer material layer, Ma
A reinforcing fiber-containing material layer having a Trix resin ,
Elongation at maximum tensile load of the cushioning material layer is a reinforcing fiber-containing material.
Elongation of the matrix resin contained in the layer at maximum tensile load
Reinforced structure of concrete structure characterized by being larger .