JP2002070495A - Reinforced structure of concrete structure having curved surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforced structure that can prevent the separation fall of concrete or the like on an inner wall surface due to the deterioration of a concrete structure having a curved surface, minimize the sectional area reduction rate of the concrete structure due to repair and reinforcement, minimize execute scale and complexity for improving efficiency, be reinforced, and at the same time has better durability than a conventional reinforced fiber sheet. SOLUTION: The reinforced structure is used to reinforce the concrete structure having the curved surface on an inner wall, comprises a buffer material surface whose growth in the tensile maximum load at 23 deg.C is 10-200%, and a layer containing reinforced fiber, and reinforced structure is provided at least on the curved surface of the inner wall surface of the concrete structure so that the layer containing reinforced fiber is arranged along the direction of curvature and the buffer material layer is included the layer for containing reinforced fiber and the inner wall surface of the concrete structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a concrete structure having a curved surface, such as a railway tunnel, a road tunnel, a mountain tunnel, a waterway tunnel for a hydroelectric power plant, an agricultural waterway, a water supply and sewage system, an industrial water, a river discharge channel, and the like. For concrete structures, such as headrace tunnels, pressure headrace tunnels, fume pipes, etc., constructed in the soil and subject to stresses such as pressure from inside or outside, concrete bridges with curved surfaces, U-shaped concrete grooves, etc. And a reinforcing structure for a concrete structure having a curved surface that can be integrally provided and reinforced / repaired.

[0002]

2. Description of the Related Art Among concrete structures having curved surfaces, road tunnels and the like are subject to loosening, freezing and thawing due to a long period of time after completion, freezing and thawing, water leakage from crack generating portions and joints, earthquakes, and ground. It has been pointed out that the concrete on the inner wall of the tunnel may fall off due to fluctuations in the surface of the tunnel. In this way, stress changes occur due to increased pressure, expansive behavior, loosening ground pressure, etc. In tunnels where deformation has occurred, remodeling (all sections, partial sections), renovation, reinforcement, It is necessary to perform repairs and take other measures to prevent concrete from falling off. Conventional reinforcement methods include spraying the concrete surface of the inner wall of the tunnel with concrete, PC board, and the like, and further providing an arched support using a liner plate and H-shaped steel, steel plate attachment, and the like. And the method disclosed in JP-A-7-34784, in which a reinforcing fiber sheet is attached to the inner wall, and the like are known. In addition, in a headrace tunnel or the like, water leakage may occur due to deterioration for various reasons, leading to destruction. In addition, the strength of the pressure headrace tunnel with respect to the internal water pressure or the external pressure is reduced, and the possible water flow is reduced. It is necessary to repair or reinforce the inner surface of the lining concrete layer of the pressure headrace tunnel where such deterioration has occurred. Such repairing and reinforcing methods include a method of spraying steel fiber-mixed mortar, steel fiber-mixed concrete, etc. onto the surface of the existing lining concrete layer, coating (resin mortar, steel fiber-mixed mortar, etc.) on the surface (coating). A construction method, a casting method, a sticking method, and the like are employed. In recent years, in existing reinforced concrete structures and the like, due to deterioration due to aging of structural members, structures that can no longer maintain the performance at the time of design and structures that require better performance are occasionally seen. It has become. 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. As a reinforcing technique for such an existing reinforced concrete structure, a method of attaching a reinforcing fiber sheet to the surface of a concrete frame of an existing concrete structure and integrating the reinforcing fiber sheet with the concrete frame has been generally adopted. And has many achievements. In concrete structures such as beams, columns, slabs, walls, and chimneys, the effect of reinforcing existing reinforced concrete structures by attaching a reinforcing fiber sheet to the outer surface of the concrete frame has been confirmed. .

[0003]

However, headrace tunnels such as railway tunnels, road tunnels, mountain tunnels, waterway tunnels for hydropower stations, agricultural waterways, water supply and sewerage, industrial water, river drainage channels, pressure headrace tunnels, fumes For concrete structures constructed in the soil such as pipes and subjected to stresses such as pressure from inside or outside, it is practically impossible to attach a reinforcing fiber sheet to the surface of the structure's outer wall. In this method, the reinforcing fiber sheet is stuck. However, in this method, the effect of the reinforcing fiber sheet occurs at an early stage and the effect of the reinforcing fiber sheet is not effectively exhibited, and the strength of the structure does not increase, so that it is not effective as a reinforcing method. . For example, the repair / reinforcement by the reinforcing fiber sheet is described in Japanese Unexamined Patent Publication No.
As proposed in Japanese Patent No. 231095, a tunnel structure, particularly an annular tunnel structure, has a small reinforcing effect, and a small displacement causes separation between the inner wall of the tunnel structure and the reinforcing fiber sheet. There is a problem that it is easy. Normally, the reinforcing fiber sheet is adhered to the inner wall surface of the tunnel structure via an adhesive or the like. However, the adhesive layer conventionally used has almost no elongation at 23 ° C. under a maximum tensile load, and at most 2 % Or less, the reinforcing fiber sheet and the tunnel structure do not exhibit a buffering action capable of preventing peeling of the reinforcing fiber sheet and the like. For this reason, such a method of attaching a reinforcing fiber sheet to the inner wall surface of a concrete structure has been carried out for the purpose of restraining cracks and preventing the concrete from coming off, and has been used for the purpose of reinforcing the structure to increase its strength. Has not been implemented.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a method of attaching a reinforcing fiber sheet to the inner wall surface of a concrete structure by a new fixing method, by integrating the reinforcing fiber sheet and the concrete frame. Another object of the present invention is to provide a reinforcing structure capable of sufficiently exerting the ability of a reinforcing fiber sheet and increasing the strength of a concrete structure.

[0005]

According to the present invention, there is provided a reinforcing structure for reinforcing a concrete structure having a curved surface on an inner wall, wherein the elongation at a maximum tensile load at 23 ° C. is 10 to 2 times.
A reinforcing fiber-containing layer and a reinforcing fiber-containing layer, wherein the reinforcing fibers are arranged along the bending direction of the reinforcing fiber-containing layer. And a reinforcing structure for a concrete structure, which is provided on at least a curved surface of an inner wall surface of the concrete structure so as to be interposed between the concrete structure and an inner wall surface of the concrete structure. Further, according to the present invention, there is provided a reinforcing structure for reinforcing a concrete structure having an annular inner wall surface, wherein the elongation at the maximum tensile load at 23 ° C. is 10 to 200.
%, And a reinforcing fiber-containing layer, wherein the reinforcing structure is such that the reinforcing fibers of the reinforcing fiber-containing layer are arranged along the circumferential direction of the inner wall, and the buffer material layer is formed of reinforcing fibers. A concrete structure characterized by being provided continuously in the circumferential direction at least partially in the longitudinal direction of the inner wall surface of the concrete structure so as to be interposed between the containing layer and the inner wall surface of the concrete structure. A reinforcement structure is provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The reinforcing structure of the present invention is an existing concrete structure having a curved surface, for example, an existing concrete structure having a curved surface having a radius of 300 mm or more continuous in the longitudinal direction, and an annular inner structure. It can be used for reinforcing an existing concrete structure having a wall surface, for example, an existing concrete structure having an annular inner wall surface having a radius of 300 mm or more. Concretely, headrace tunnels such as railway tunnels, road tunnels, mountain tunnels, waterway tunnels for hydroelectric power plants, agricultural waterways, water supply and sewerage, industrial water, river drainage channels, etc .; underground water pressure tunnels, fume pipes, etc. Concrete structure having an inner wall with a curved surface that is continuous in the longitudinal direction and is subjected to stress such as pressure from inside and outside, and furthermore, a concrete structure having an annular inner wall surface, and a concrete bridge having a curved surface By being provided integrally with a U-shaped concrete groove or the like and using it for reinforcement such as reinforcement and repair, the concrete structure can have a high bending and tensile reinforcement effect. The reinforcing structure of the present invention includes a buffer layer having an elongation at a maximum tensile load at 23 ° C. of 10 to 200%, and a reinforcing fiber-containing layer.

In the present invention, the cushioning material layer has a function of dispersing the stress generated in the concrete structure and transmitting it to the reinforcing fiber sheet layer. Examples of the material of the buffer 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 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,
A resin containing 50 to 100% by mass, particularly 59 to 98% by mass, more preferably 70 to 80% by mass, and 0 to 50% by mass of a filler is preferable. Tensile modulus at 23 ° C. at the time of curing the resin is preferably in a 0.1~50N / mm ^2, further preferably in the 0.5~10N / mm ^2. The tensile modulus can be measured according to JIS K7113.

[0008] In addition to the above-mentioned resin, the cushioning material layer is used in the present invention to improve the work of applying to a structure by maintaining an appropriate viscosity range when forming the cushioning material or preventing run-out. A filler, a thixotropic agent, a non-conformity adjusting agent, and the like can be appropriately contained as long as the purpose is not impaired. The addition of the filler slightly reduces the elongation at the maximum tensile load, but can also improve the tensile strength and the tensile modulus of the cushioning material.

[0009] 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. No.

As the thixotropic agent, there are an organic type and an inorganic type, but an inorganic type is preferable, and fumed silica, layered clay mineral, swellable mica, synthetic smectite, bentonite, carbon black, Hectorite or the like can be used.

[0011] The content of each of the filler and the thixotropic agent in the buffer layer is 0 to 50% by mass, preferably 1 to 40% by mass, and more preferably 10 to 20% by mass.
It is preferred that

The buffer material layer has an elongation at a maximum tensile load at 23 ° C. of 10 to 200%, preferably 10 to 100%. In some cases, dripping becomes a problem when applied to the surface of a concrete structure. In such a case, if the elongation at the maximum tensile load is reduced, the dripping may be solved. Further, it is particularly preferable that the cushioning material has a tensile maximum load elongation greater than a resin contained in the reinforcing fiber-containing layer or a matrix resin used for attaching the reinforcing fiber-containing layer. Further, the tensile strength of the buffer material layer is preferably 0.1 to 50 N / mm ² at 23 ° C. The maximum tensile load elongation and tensile strength of the cushioning material layer are determined by JI
It can be measured according to SK7113.

When the resin contained in the cushioning material layer is cured, the tensile modulus at 23 ° C., the maximum tensile load elongation at 23 ° C., and the tensile strength are within the above ranges, whereby the reinforcing fiber-containing layer is formed. Can be prevented, and the strength of the reinforcing fiber-containing layer can be maximized.

[0014] The buffer material layer further has an elongation at a maximum tensile load at 5 ° C of 10 to 200%, more preferably 10 to 200%.
100%, tensile strength at 5 ° C. is 0.1 to 50 N / mm ² ,
Tensile modulus of the cured product of the resin alone at 5 ° C. is 0.1 to 5
It is preferably 0 N / mm ² , more preferably 0.5 to 10 N / mm ² . By using such a buffer material layer that can maintain the above-mentioned material properties even at low temperatures, a good reinforcing effect can be obtained even under cold use conditions. Commercially available products can be used as the material of the buffer material layer. For example, EE50, EE manufactured by Toho Earth Tech
50W, EE60 and the like can be used.

When a thermosetting resin is used as the resin constituting the cushioning material layer, for example, when the thermosetting resin is applied to the inner wall surface of the concrete structure to form the cushioning material layer, the curing temperature is set with a hot roll or a drier. It can be formed by heating and curing until heated. In the case of performing such an operation, it is preferable to use a thermosetting resin that is room-temperature-curable, and it is preferable to use a two-liquid mixture type in terms of the operation process when applying the resin on site. Such coating is performed by using a material such as a roller brush, a rubber spatula, or a gold trowel as a buffer material, and the thickness of the buffer material layer is usually 100 to 2000 μm, preferably 200 to 1000 μm.
It is preferable to apply uniformly so as to obtain m. As the cushioning material layer, a sheet-like material which has been cured and formed in advance may be used as long as it has the above-mentioned material properties and thickness.

The viscosity of the material before the buffer layer is cured is determined to be such that the viscosity at 20 ° C. according to JIS K6833 two-part measurement method is usually 50 to 1,000,000 mPa · s, preferably 5000 to 300,000 mPa · s. Desirable for work. In order to maintain this viscosity range, and to improve the application work to the concrete structure such as sagging prevention, a filler, a thixotropic agent and the like are appropriately added to the buffer material layer within a range that does not impair the object of the present invention. It can also be added in the material.

The surface of the cushioning material layer on the side of the reinforcing fiber-containing layer, which will be described later, can be modified by physical or chemical treatment as necessary to improve the adhesion to the reinforcing fiber-containing layer. Examples of the physical treatment include polishing, roughening with sandpaper or the like, or ultrasonic treatment, and the like.
Examples of the chemical treatment include a method of partially oxidizing the surface and adding a functional group. Specific examples include corona treatment, plasma treatment, and oxidizing agent treatment. These treatments can be preferably applied particularly when a polyethylene resin, a polypropylene resin, or the like is used as a resin forming the buffer material layer. As the method of forming the buffer material layer, (i) a method of applying a raw material of a liquid buffer material layer on a surface to be formed and then curing the material, or (ii) a method of forming the film into a film shape or the like. A method of attaching a buffer material layer and the like can be mentioned.

In the case where the buffer layer is formed by the method (i), a thermosetting resin, particularly a thermosetting resin curable at room temperature, is more preferable because of good workability. Further, a two-component mixed type resin is also preferable.

When a material containing a room-temperature-curable thermosetting resin is used as the material of the buffer layer, the pot life at 20 ° C. is preferably 30 minutes to 5 hours, and more preferably 3 minutes.
A time of 0 minutes to 2 hours is desirable in terms of workability. Also 2
The coating film curing time at 0 ° C. is preferably from 1 hour to 24 hours, more preferably from 1 hour to 12 hours in view of the working process. The design strength development time of the material of the buffer layer is usually 1 to 20 days at 20 ° C., preferably 1 to 7 days.
Day is desirable. The viscosity of the material of the buffer layer is JI
SK6833 measurement method at 20 ° C usually 50 to 10
00000 mPa · s, preferably 5000 to 3000
It is desirable for the coating operation to be 00 mPa · s.

The material for the buffer material layer is applied by using a material such as a roller brush, a rubber wrench, or a gold iron, and the thickness of the buffer material layer is usually 100 to 2000 μm, preferably 200 to 200 μm.
It can be carried out by uniformly coating so as to have a thickness of up to 1000 μm.

The hardening of the applied material of the buffer layer can be carried out by heating to the hardening temperature with a hot roll or a drier after coating on the surface of the structure when a thermosetting resin is contained. When the thermosetting resin is a thermosetting resin, it can be cured by leaving it at room temperature for the design strength developing time.

When the buffer 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 buffer layer. The thickness of the formed cushioning material layer is usually 100 to 2000 μm.
m, particularly preferably 200 to 1000 μm. As a method for attaching the formed 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 a material capable of adhering the buffer material layer with an adhesive strength equal to or higher than the concrete strength, and specifically, for example, the same material system as the buffer material layer is used. preferable.

In the present invention, the reinforcing fiber-containing layer comprises:
A layer that repairs or reinforces the inner wall surface of the concrete structure, and is basically composed of a matrix fiber and a reinforcing fiber sheet in which reinforcing fibers are laid out in a reinforcing direction that is stuck on the cushioning material layer, and has high toughness. Is given. This reinforcing fiber sheet is basically composed of 1 to 5 layers, but may be arranged so that 6 or more layers are laid as needed to enhance the reinforcing effect. The matrix resin only needs to have good impregnation properties, and in addition to the epoxy resin, an unsaturated polyester resin, an epoxy acrylate resin, a methacrylate resin, a vinyl ester resin, or the like can be used.

In the reinforcing fiber-containing layer, a two-dimensional woven fabric, a unidirectional woven fabric, a unidirectional material, or the like can be used as a reinforcing fiber usage form. As the unidirectional fabric or unidirectional material, the warp is a reinforcing fiber, the weft is an auxiliary yarn (may be used for some warps), and usually, the auxiliary yarn is a glass fiber, for example, a thermoplastic resin-containing fiber ( The warp and the weft are woven in a plain weave, twill weave, entangled weave, or the like, in which the warp and the weft are fixed by the thermoplastic resin in the thermoplastic resin-containing fiber. The cross-shaped material, a prepreg sheet in which reinforcing fibers are arranged in one direction, or a reinforcing grid and a mesh in which the reinforcing fibers are arranged in one direction, and the reinforcing fibers and the lattice are heated in the thermoplastic resin-containing fibers. A prepreg-like sheet fixed by a plastic resin can be used.

The reinforcing fibers in the reinforcing fiber-containing layer include, for example, carbon fibers, glass fibers, ceramic fibers,
Aramid fiber, silicon carbide fiber, vinylon fiber, polyarylate fiber, polyethylene fiber and the like can be mentioned, but carbon fiber which is lightweight and has corrosion resistance is preferable. When a carbon fiber having a high elastic modulus is required, pitch-based carbon fiber such as XN60 manufactured by Nippon Graphite Fiber is usually used. When high strength is required, a T700SC manufactured by Toray is usually used. , T300, UT500 manufactured by Toho Rayon Co., Ltd., and TR30 manufactured by Mitsubishi Rayon Co., etc. are preferably used.

The basis weight of the reinforcing fiber-containing layer is usually from 100 to 8
Preferably having 200 g / m ^2, number of filaments per bundle of reinforcing fibers is preferably present 1,000 to 10,000, tensile strength 2000~5000N / mm ^2, tensile elastic modulus 200000~1000000N / mm ² is preferred.

As a concrete construction method of the reinforcing structure of the present invention, for example, a primer layer, the buffer material layer, the undercoat layer, the reinforcing fiber-containing layer, the overcoat layer, and the like are provided on the inner wall surface of the concrete structure. A method of sequentially forming each layer such as a finishing layer is exemplified. Of these layers, the cushioning material layer and the reinforcing fiber-containing layer are formed indispensable, and the other layers can be formed as necessary. Each of these layers can be usually formed in order from the layer close to the inner wall surface of the concrete structure.However, a composite including a cushioning material layer and a reinforcing fiber-containing layer is formed in advance, and then the concrete structure is formed. It can also be carried out by sticking to the inner wall surface of the car.

An example of a method of constructing a reinforcing structure when a reinforcing fiber sheet is used as the reinforcing fiber-containing layer will be specifically described below. First, if necessary, the surface of the tunnel structure is washed with a disk sander, sand blast, rag, organic solvent, high-pressure water jet, or the like. After cleaning, repair the cracks on the inner wall of the tunnel and treat the head of the ground anchor installation part. Then, a polishing process and a pre-process for a step, a defective portion, and the like using a base adjustment material are performed.

As the base adjustment material, a resin having a compressive strength equal to or higher than the concrete strength, for example, a putty-like epoxy resin, an epoxy resin mortar, or the like can be used. Pretreatment can be performed by filling these resins and the like into steps, defective sites, and the like. Further, in the pretreatment step, it is preferable to perform the R finish of the out-going corner and the in-going corner together. After performing the above-mentioned washing, pretreatment, and the like, as necessary, it is possible to perform blacking-out as a reference for the attachment position of the reinforcing fiber-containing layer, if necessary.

Next, a primer is applied to the surface of the structure with a roller brush or the like, and dried to form a primer layer. 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 non-solvent-type epoxy resin can be used. The mixed viscosity of the primer is usually 1 to 10,000 mPa · s at 20 ° C., preferably 10 to 5 mPa · s.
000 mPa · s is preferable in terms of workability. The use temperature at the time of applying the primer is usually preferably from -10 ° C to 50 ° C. The amount of the primer applied is usually 0.01 to 1 kg / m ² , preferably 0.1 to 0.5 kg / m ² . The time for drying the primer is generally 1 to 24 hours, preferably 1 to 12 hours at 20 ° C. The primer may be treated with an impregnating adhesive resin such as an aqueous silane-based osmotic water-absorbing agent.

After the formation of the primer layer, the material of the buffer material layer made of, for example, epoxy resin (for example, EE50 manufactured by Toho Earth Tech Co., Ltd.) is applied at a rate of 300 to 600 g / m ² for 300 times.
It is applied to a thickness of about 400 μm to form a buffer material layer. The buffer material layer may include a non-adjustment material such as a putty material if necessary, and may include a non-adjustment material layer in which the non-adhesion of the layer surface is adjusted. A material for a buffer layer made of epoxy resin is applied on the material layer. Further, if necessary, the surface of the buffer material layer may be modified by physical or chemical treatment, and then, if necessary, a step of applying a matrix resin material or the like as an undercoat layer may be performed.

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 combination thereof can be used, but a resin having good adhesion to the buffer layer is desirable.

In addition to the above-mentioned resin, the matrix resin material may be appropriately filled with a filler, a thixotropic agent, etc. within a range that does not impair the object of the present invention, in order to maintain an appropriate viscosity range upon application and prevent sagging. Can also be contained.

Examples of the filler include carbon black, calcium carbonate, talc, silicic acid, silicate, and lead white, lead red, graphite, titanium dioxide, strontium chromate, titanium yellow, and other pigments known as inorganic pigments. No. As the thixotropic agent, there are an organic type and an inorganic type, but an inorganic type is preferable, and fumed silica, layered viscosity mineral, swellable mica, synthetic smectite, bentonite, carbon black, hectorite Etc. can be used. The content ratio of the filler and / or the thixotropic agent in the matrix resin material is preferably 1 to 20% by mass.

When the matrix resin material containing the above-mentioned cold-setting resin is used, the pot life at 20 ° C. is preferably 30 minutes to 5 hours, more preferably 30 minutes to 2 hours. Desirable in point.
Further, the coating film curing time at 20 ° C. is usually from 1 to 24 hours, and preferably from 1 to 12 hours in terms of working steps.

The matrix resin material has a design strength development time at 20 ° C. of usually 1 to 20 days, preferably 1 to 20 days.
Preferably, it is seven days. The viscosity is usually 10 to 100,000 mPa · s at 20 ° C., preferably 10 to 100,000 mPa · s.
A pressure of 0 to 50,000 mPa · s is desirable because of good impregnation and defoaming.

Matrix resin material as the undercoat layer
In the step of applying a material, the matrix resin material is rolled.
With a brush or rubber spatula, the application amount is usually 0.1 to 2 kg
/ M ^Two, Preferably 0.2 to 1 kg / m^TwoIt will be in the range of
This can be achieved by applying the coating uniformly.

Next, a reinforcing fiber sheet is stuck on the undercoat layer. In this step, immediately after the application of the undercoat layer, the reinforcing fiber sheet is stuck along the blacking-out position, preferably the surface of the sheet in the reinforcing fiber direction, more preferably in the reinforcing fiber direction from the center to the end of the sheet. A rubber spatula, along
It can be performed by ironing with 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.
Reinforcing fiber sheet, the concrete structure has a curved surface continuous in the longitudinal direction on the inner wall, particularly, when having a circular inner wall surface, when laid on the curved surface or the like, the desired reinforcing effect. In order to obtain, it is necessary to lay the reinforcing fibers so as to be arranged along the curved direction or the circumferential direction of the inner wall. At this time, when the reinforcing fibers of the reinforcing fiber sheet are arranged in two or more directions, the reinforcing fibers may be laid so that one direction is arranged along the bending direction or the circumferential direction. After laying out, it can be rolled with a hot roll or a brush and embedded in a matrix resin to form a reinforcing fiber-containing layer.

In the step of attaching the reinforcing fiber sheet,
If the length of 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 stuck together. In this case, in order to secure the strength, it is preferable that the joint portions are attached so as to overlap by 100 mm or more in the direction in which the strength is secured.

Next, a matrix resin material or the like as an overcoat layer is applied on the reinforcing fiber sheet. This step is
Using the same matrix resin material and the like as used in the undercoat, usually with a roller brush or rubber spatula etc.
~2kg / m ^2, preferably it can be carried out by uniformly applied by a coating amount of 0.1~1kg / m ^2.

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.

Finally, finishing 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 a protective layer. FIG. 1 shows an example in which the reinforcing structure of the present invention is integrally formed on the inner wall surface of the concrete structure. In FIG. 1, 10 is a concrete structure having a curved surface in the longitudinal direction, 11 is a primer layer, 12 is a cushioning material layer, 13 is an undercoat layer, 14
Is a reinforcing fiber layer, 15 is an overcoat layer, and 16 is a surface finishing layer.

In the working example described above, only one layer of the reinforcing fiber sheet is provided, but in the present invention, two or more layers of the reinforcing fiber sheet can 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. The reinforcing structure composed of the cushioning material layer and the reinforcing fiber-containing layer thus formed can exhibit strength and rigidity several times higher than that of the conventional reinforcing fiber sheet after construction. Further, the reinforcing structure of the present invention can be applied to a portion of the inner wall surface where reinforcement of the concrete structure is required, and can be applied to almost the entire surface. In particular, when reinforcing a concrete structure having an inner wall having a curved surface continuous in the longitudinal direction, or a concrete structure having an annular inner wall surface, the reinforcing fibers of the reinforcing fiber-containing layer are formed in the bending direction or the circumferential direction. By arranging along, a higher reinforcement effect is obtained, and furthermore,
In the case of a concrete structure having an annular inner wall surface, by providing at least part or all of the inner wall surface in the longitudinal direction of the structure continuously in the circumferential direction, a tensile stress that cannot be obtained by a conventional reinforcing fiber sheet is obtained. Excellent performance can also be exhibited.

In the case where the concrete structure is a road tunnel, the tunnel is hardly closed during construction, and construction can be performed while passing through one lane. Moreover, the tunnel can be used immediately after the completion of the construction. Further, an earth anchor can be driven into the ground at a predetermined interval from the outer surface of the constructed reinforcing fiber-containing layer, and the head of the earth anchor can be fixed and treated with an iron plate and bolts. The driving of the earth anchor may be performed prior to the application of the reinforcing fiber-containing layer. Combining the driving of such an earth anchor further ensures the safety of the concrete block from falling off.

In the above construction, dedicated construction equipment having a bogie is used according to the cross-sectional size, construction extension, scale, conditions, etc. of the concrete structure, but a versatile work bogie, a simple scaffold, or the like is used. It can be constructed by robotized machines or human power. When the cross section of the concrete structure is large, attaching a reinforcing fiber sheet,
Mechanical construction may be performed by a robot capable of applying epoxy resin or the like. In addition, small cross-section reduction rate by repair, reduction of construction scale and high water stopping effect especially in headrace tunnel, etc. obtained by the conventional reinforcing fiber sheet method,
Excellent effects such as maintaining tensile resistance against internal water pressure and maintaining small wall resistance can be maintained. As a result, for example, the strength of the existing concrete structure can be positively utilized, the economy can be improved, and the service life can be prolonged.

In addition to the reinforcing structure of the present invention, ground reinforcement by anchor members, suspension of the structure, formation of arches, etc. are combined to further cover the void filler on the concrete surface, the soil improving agent, and the like. By injecting into concrete and ground, the internal stress acting on the lining concrete layer can be balanced and the reinforcing effect can be made more efficient. In addition, according to the degree and scale of reinforcement required for the concrete structure, it can be extremely flexibly supported, can be constructed with relatively small-scale temporary facilities, and widely supports special forms according to various conditions. it can.

As described above, the reinforcing structure of the present invention can be formed while being constructed on site, and can be formed by laminating a laminate, which has been cured and molded to a desired size and thickness in advance, via an adhesive layer or the like. It can be attached to the inner wall of a concrete structure for construction. Further, when constructing the reinforcing structure of the present invention, if necessary, it may be provided via another layer such as an undercoat layer, or may be provided with another layer such as an overcoat layer and a finishing layer. it can. As such other layers, known layers can be appropriately combined and used.

[0048]

The reinforcing structure of the present invention includes a specific buffer material layer and a reinforcing fiber-containing layer, and the buffer material layer is interposed between the reinforcing fiber-containing layer and the inner wall surface of the concrete structure. Since the reinforcing structure is provided on at least a part of the inner wall surface of the concrete structure, the inner wall surface due to the deterioration of the concrete structure having the curved surface or the concrete structure having the annular inner wall surface Of concrete, etc. can be prevented, the reduction rate of the cross-sectional area of the concrete structure due to repair and reinforcement can be minimized, construction scale and complexity can be minimized, reinforcement can be performed efficiently, and its durability performance Is also superior to conventional reinforced fiber sheet construction. In particular, when reinforcing the concrete structure, by arranging the reinforcing fibers of the reinforcing fiber-containing layer along the curved direction or the circumferential direction of the inner wall, more excellent strength can be imparted to the concrete structure. Furthermore,
By providing at least part of the inner wall surface longitudinal direction of the concrete structure having an annular inner wall surface in a continuous manner in the circumferential direction, the conventional reinforcing fiber sheet is also excellent in tensile stress that the reinforcing effect cannot be expected with the conventional reinforcing fiber sheet. Strength can be obtained. In addition, the concrete structure of the present invention is reinforced and used for any existing or new concrete structure.
Can be repaired.

[0049]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below, but the present invention is not limited thereto. Example 1 Concrete fume tube (JIS A5303B type 1)
Seed, inner diameter 1200mm, thickness 95mm, length 2430m
m) The inner wall was washed with a high-pressure water jet, and an epoxy-based primer was applied over the entire inner wall to form a primer layer. Next, a material for a cushioning layer made of epoxy resin (EE5 manufactured by Toho Earth Tech Co., Ltd.) is applied to the entire inner wall.
0) was applied at a rate of 600 g / m ² to form a buffer layer having a thickness of 500 μm. Physical properties of the molded article in the same manner as this buffer material layer were measured.
Elongation at maximum tensile load according to IS K7113 is 95%,
JIS K711 at a tensile strength of 1.4 N / mm ² at 5 ° C
3. The tensile elongation at maximum load according to No. 3 is 65%, and the tensile strength is 6.
It was 5 N / mm ² . Subsequently, a matrix resin (trade name: Bond E2500, manufactured by Konishi Co., Ltd.) is formed on the cushioning material layer.
Is applied with a roll, and a reinforcing fiber sheet (TU cloth ST200-50 manufactured by Nisseki Mitsubishi Co.,
m ² , sheet width 50 mm, design thickness 0.11 mm, tensile strength 3430 N / mm ² , tensile elasticity 2.3 × 10 ⁵ N /
mm ² ). The reinforcing fiber sheet was arranged along the circumferential direction of the fume tube, and was rolled with an impregnating roll. As a result, the reinforcing fiber sheet was embedded in the matrix resin. Further, application of the matrix resin and lamination of the reinforcing fiber sheet were repeated, and finally a reinforcing fiber sheet layer having two reinforcing fiber sheet layers was formed on the entire inner wall surface of the fume tube. About the obtained reinforced fume tube,
A load P was applied until a fracture occurred in accordance with IS A5303 “Centrifugal reinforced concrete pipe”, and a loading test was performed.
The state of reinforcement and the outline of the test are shown in FIGS. 2 and 3, and the results are shown in Table 1. 2 and 3, reference numeral 20 denotes a concrete fume pipe, 21 denotes a buffer layer, 22 denotes a reinforcing fiber sheet, and 23 denotes a loading jig. The obtained reinforced fume pipe has improved proof strength compared to the unreinforced pipe, and it can be observed that the tensile stress generated above and below the pipe is dispersed in the left and right circumferential direction of the pipe due to the presence of the buffer material layer. And had better performance than those of the following comparative examples.

Comparative Example 1 A reinforced fume tube was prepared and subjected to a loading test in the same manner as in Example 1 except that the cushioning material layer was not formed. Table 1 shows the results.

Comparative Example 2 A load test was performed on the fume tube before reinforcement used in Example 1 in the same manner as in Example 1. Table 1 shows the results.

[0052]

[Table 1]

Example 2 Concrete fume tube (JIS A5303B type 1)
Seed, inner diameter 1200mm, thickness 95mm, length 2430m
Using m), the fume tube was cut out so as to be exactly a semicircle. The inner wall of the semicircular fume tube was washed with a high-pressure water jet, and an epoxy-based primer was applied over the entire inner wall to form a primer layer. Next, a material for the cushioning layer made of epoxy resin is formed on the entire inner wall.
(EE50 manufactured by Toho Earth Tech Co., Ltd.) was applied at a rate of 600 g / m ² to form a buffer layer having a thickness of 500 μm.
When the physical properties of the molded article in the same manner as the cushioning material layer were measured, the elongation at the maximum tensile load according to JIS K7113 at 23 ° C. was 95%, and the tensile strength was 1.4 N / mm.
^2. Tensile modulus according to JIS K7113 is 1.5 N / m
The elongation at the maximum tensile load according to JIS K7113 at m ² and 5 ° C. was 65%, and the tensile strength was 6.5 N / mm ² .
Subsequently, a matrix resin (trade name: Bond E2500, manufactured by Konishi Co., Ltd.) is applied on the cushioning material layer by a roll, and a reinforcing fiber sheet (TU cloth ST2 manufactured by Nisseki Mitsubishi Corp.) is applied thereon.
00-50, basis weight 200 g / m ² , sheet width 50 mm,
Design thickness 0.11mm, tensile strength 3430N / mm ² ,
Tensile modulus of 2.3 × 10 ⁵ N / mm ² ) was laid. The reinforcing fiber sheet was arranged along the circumferential direction of the fume tube, and was rolled with an impregnating roll. As a result, the reinforcing fiber sheet was embedded in the matrix resin.
Further, application of the matrix resin and lamination of the reinforcing fiber sheet were repeated, and finally a reinforcing fiber sheet layer having two reinforcing fiber sheet layers was formed on the entire inner wall surface of the fume tube. Regarding the obtained reinforced semicircular fume tube, JIS A530
3 A load P was applied until a breakage occurred in accordance with "Centrifugal Reinforced Concrete Pipe", and a loading test was performed. The state of reinforcement and the outline of the test are shown in FIGS. 4 and 5, and the results are shown in Table 2. 4 and 5, 30 is a semicircular fume pipe made of concrete, 31 is a cushioning material layer, 32 is a reinforcing fiber sheet, 33
Indicates a loading jig. The obtained reinforced fume pipe has improved proof strength compared to the unreinforced pipe, and it can be observed that the tensile stress generated above and below the pipe is dispersed in the left and right circumferential direction of the pipe due to the presence of the buffer material layer. Was. Further, it had excellent performance as compared with those of the following comparative examples.

Comparative Example 3 A reinforced semicircular fume tube was prepared in the same manner as in Example 2 except that the cushioning material layer was not formed, and a load test was performed. Table 2 shows the results.

Comparative Example 4 A loading test was performed on the semicircular fume tube before reinforcement used in Example 2 in the same manner as in Example 2. Table 2 shows the results.

[0056]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a schematic diagram conceptually showing an example in which a reinforcing structure of the present invention is integrally provided on an inner wall surface of a concrete structure having a curved surface in a longitudinal direction.

FIG. 2 is a schematic front view showing an apparatus and a reinforced concrete structure used in a loading test performed in Example 1 and the like.

FIG. 3 is a schematic side view of the apparatus and the reinforced concrete structure shown in FIG. 2;

FIG. 4 is a schematic front view showing an apparatus and a semicircular reinforced concrete structure used for a loading test performed in Example 2 and the like.

FIG. 5 is a schematic side view of the device and the semicircular reinforced concrete structure shown in FIG. 4;

[Explanation of symbols]

 10: Concrete structure having a curved surface 11: Primer layer 12, 21, 31: Buffer material layer 13: Undercoat layer 14: Reinforcement fiber layer 15: Overcoat layer 16: Surface finish layer 20: Concrete fume pipe 22, 32: Reinforcing fiber sheet 23, 33: Loading jig 30: Concrete semicircular fume tube

Continued on the front page (72) Inventor Toshiya Maeda 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kentaro Tsubouchi 1-3-12 Nishishinbashi, Minato-ku, Tokyo Mitsui Nishiishi Co., Ltd. (72) Inventor Hideyuki Komaki Inventor Hideyuki Komaki 8 Chidoricho, Naka-ku, Yokohama-shi, Kanagawa Pref.

Claims (6)

[Claims] 1. A reinforcing structure for reinforcing a concrete structure having a curved surface on its inner wall, comprising: a buffer material layer having a maximum tensile load elongation at 23 ° C. of 10 to 200%; Wherein the reinforcing structure is such that the reinforcing fibers of the reinforcing fiber-containing layer are arranged along the bending direction, and the buffer material layer is interposed between the reinforcing fiber-containing layer and the inner wall surface of the concrete structure. A reinforcement structure for a concrete structure, which is provided on at least a curved surface of an inner wall surface of the concrete structure. 2. A reinforcing structure for reinforcing a concrete structure having an annular inner wall surface, comprising: a buffer material layer having a maximum tensile load elongation at 23 ° C. of 10 to 200%; Wherein the reinforcing structure is such that the reinforcing fibers of the reinforcing fiber-containing layer are arranged along the circumferential direction of the inner wall, and the buffer material layer is between the reinforcing fiber-containing layer and the inner wall surface of the concrete structure. A reinforcing structure for a concrete structure, wherein the reinforcing structure is provided at least partly in the longitudinal direction of the inner wall surface of the concrete structure so as to be interposed therebetween in the circumferential direction. 3. The tensile strength of the cushioning material layer at 23 ° C.
0.1-50N / mm ^TwoClaims characterized in that
3. A reinforcing structure for a concrete structure according to 1 or 2. 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 modulus of elasticity of 0.1 to 50 N at 23 ° C. when cured. / M
reinforcing structure according to any one of the preceding concrete structure according to claim 1 which is a resin of m ^2. 5. The buffer material layer has 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 5%.
0N / mm ² , and the cushioning material layer is made of resin 50-1
The resin has a tensile modulus of 0.1 to 50 at 5 ° C. when cured.
4. A resin of N / mm ^2.
The reinforcing structure for a concrete structure according to any one of the above. 6. The buffer material layer has 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 200%.
50 N / mm ² , and the buffer material layer is made of resin
The resin contains 100% by mass and 0 to 50% by mass of a filler, and the resin has a tensile elasticity at 23 ° C. of 0.1 to 0.1% when cured.
50 N / mm ² , tensile modulus at 5 ° C. is 0.1 to 50
4. A resin of N / mm ^2.
The reinforcing structure for a concrete structure according to any one of the above.