JPH08303018A - Concrete structure reinforcing material and concrete structure reinforcing method using the material - Google Patents

Abstract

PURPOSE: To easily execute an aseismatic reinforcement work by applying the constitution that long-sized materials of fiber reinforced resin jointed to each other with a flexible material in a plate form are wound around a concrete column or the like, and the external surfaces of the materials is lashed with a reinforced fiber bundle impregnated with uncured resin. CONSTITUTION: A plurality of long-sized materials 1 formed out of thermoplastic resin or photo-curing resin such as epoxy resin and polyester resin strengthened with inorganic fiber such as carbon fiber, or organic fiber such as aramid fiber, are jointed to each other via flexible nonwoven fabric, a film or the like, thereby forming a plate type reinforcing material. The cross section of the material 1 may be rectangular, circular, elliptic, polygonal, hollow or the like. The plate type reinforcing material so made is, then, wound around an existing concrete structure, and the external surface thereof is lashed with a reinforced fiber bundle 4 impregnated with uncured resin. Thereafter, the resin is cured and the bundle 4 is secured, thereby reinforcing a section having an insufficient aseismatic function. Thus, even an unskilled person can easily reinforce the concrete structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure reinforcing material used for reinforcing existing concrete structures and a concrete structure reinforcing method using the same.

[0002]

2. Description of the Related Art Since existing concrete structures are constructed based on old design standards and guidelines, they have insufficient seismic resistance in light of the current current design standards, and it is necessary to reinforce them. Further, in many cases, reinforcement is required because a load larger than the design load is taken along with the reconstruction of the structure.

Conventionally, for the above-mentioned reinforcement, (a) the surroundings of an existing concrete structure are surrounded by a steel plate, a welded wire mesh, an iron basket, etc., and the loading capacity is not reduced even if some damage such as cracks occurs. Attempts have been made to do so.
In addition, (b) a method in which a prepreg obtained by impregnating an uncured resin into a reinforcing fiber is attached to an existing concrete structure and then cured after winding, and (c) an existing reinforced fiber sheet impregnated with a small amount of resin to maintain its shape A method of impregnating and hardening a resin after being applied to a concrete structure has been proposed.

[0004]

However, (a)
In the reinforcing member and method of welding, welding fusing of steel sheets, etc. at the site of reinforcement is indispensable, and not only reliable work by an expert who has acquired welding skills is required, but The use of heavy equipment is essential for carrying in.
In the methods of (b) and (c), it is not necessary to use heavy machinery, but it is laborious to attach a non-rigid sheet-like material to a vertical surface, and the same applies to impregnating the attached sheet with resin. It requires a great deal of labor and drips, so that uniform resin impregnation cannot be expected due to unskilled workers.

The object of the present invention is to solve the above-mentioned problems, that is, concrete used for reinforcing existing concrete structures which does not require construction by a skilled person and has a certain reinforcing effect regardless of the skilled person. It is to provide a reinforcing material for a structure and a reinforcing method using the same.

[0006]

The present inventors have completed the present invention as a result of intensive studies to achieve the above object. That is, the first gist of the present invention is a concrete structure reinforcing material formed by connecting adjacent fiber-reinforced resin elongated bodies of a plurality of fiber-reinforced resin elongated bodies arranged in the width direction with a flexible material. Yes, the second gist is the concrete structure to be reinforced,
The outer periphery of a concrete structure reinforcement made by connecting adjacent fiber-reinforced resin elongate members of a plurality of fiber-reinforced resin elongate members arranged in the width direction with a flexible material so that their longitudinal directions are aligned. A method of reinforcing a concrete structure comprises winding a reinforcing fiber bundle impregnated with an uncured resin, and then hardening the resin.

The present invention will be described in detail below. In the concrete structure reinforcing material of the present invention, the fiber-reinforced resin elongated bodies described later are arranged in the width direction, and it is necessary that adjacent fiber-reinforced resin elongated bodies are connected by a flexible material. For connecting the flexible material and the long fiber-reinforced resin body using the flexible material, for example, the following (1) to (3) are obtained.

(1) A long fiber-reinforced resin body is entangled and woven with fibers. (2) A non-woven fabric in which a long fiber-reinforced resin long body is arranged on at least one surface of the long fiber-reinforced resin long body arranged with an adhesive, and the long fiber-reinforced resin long body is arranged.
Adhere the film or sheet. (3) A nonwoven fabric, a film or a sheet is laminated on at least one surface of an array of elongated fiber reinforced resin and heated to fuse the elongated fiber reinforced resin with the nonwoven fabric, film or sheet.

Fiber (1) or (2), (3)
Examples of the fibers constituting the non-woven fabric include organic fibers such as polyamide fibers, polyester fibers and aramid fibers, and inorganic fibers such as glass fibers and carbon fibers, which can be selected and used according to the application, but are not particularly limited.

As the adhesive used in the method (2), known adhesives can be used, and a sheet-like adhesive containing a non-woven fabric as a carrier is preferably used although it is not particularly limited.

The fiber-reinforced resin elongated body and the flexible material may be connected to each other over the entire length in the longitudinal direction of the elongated body,
A form in which a certain pitch is determined and the pitches are connected may be adopted.

In the present invention, the cross-sectional shape of the long fiber-reinforced resin body may be any of rectangle, circle (including hollow), ellipse and polygon, and it is formed by combining plural circles like a twisted wire. It may be one.

The method for molding the long fiber-reinforced resin body is not particularly limited as long as it can obtain the above-mentioned shape, and examples thereof include pultrusion molding, sheet wrapping, hand layup, spray up and the like. Pultrusion molding and sheet wrap are preferable because the long fiber-reinforced resin has high strength and a uniform shape is easily obtained.

Examples of the reinforcing fibers constituting the long fiber-reinforced resin body include inorganic reinforcing fibers such as carbon fibers, glass fibers, boron fibers and alumina fibers, and organic reinforcing fibers such as aramid fibers and polyethylene fibers. It is not limited. As the reinforcing fiber, a single reinforcing fiber may be used, or a plurality of reinforcing fibers may be used in combination. Carbon fiber is preferable because of its high specific strength and high specific elastic modulus.

The reinforcing fibers in the long fiber-reinforced resin body are preferably oriented in the longitudinal direction of the long body. As the resin constituting the fiber reinforced resin, epoxy resin, unsaturated polyester resin, vinyl ester resin, phenol resin, silicone resin, polyimide resin, thermosetting resin such as maleimide resin, acrylic resin, polyamide resin, polyester resin, etc. Examples of the resin include a thermoplastic resin and a photocurable resin that starts to cure upon irradiation with ultraviolet rays or visible light, but is not limited thereto.

Next, a concrete structure reinforcing method using the concrete structure reinforcing material of the present invention will be described. In the reinforcing method of the present invention, so as to align the longitudinal direction of the concrete structure to be reinforced with the longitudinal direction of the fiber-reinforced resin elongated body constituting the concrete structure reinforcing material, the concrete structure reinforcing material, It is necessary to wind the resin around the concrete structure to be reinforced, further wind the reinforcing fiber bundle impregnated with the uncured resin around the outer periphery thereof, and then cure the resin.

The resin impregnated into the reinforcing fiber bundle wound around the outer periphery may be the same as or different from the resin forming the above-mentioned long fiber-reinforced resin body, and the resin forming the long body. However, the examples are not limited to these.

The reinforcing fiber bundle may be the same as or different from the reinforcing fibers constituting the long body of the fiber-reinforced resin, and is exemplified in the description of the reinforcing fibers constituting the long body. However, the present invention is not limited to these.

[0019]

The present invention will be described more specifically with reference to the following examples. (Example 1) Carbon fibers having an elastic modulus of 24 t / mm ² (TR30G manufactured by Mitsubishi Rayon Co., Ltd.) were aligned in one direction, and 1
Prepreg impregnated with 30 ° C. curing epoxy resin (TR340G125SML manufactured by Mitsubishi Rayon Co., Ltd., resin content 33% by weight, carbon fiber basis weight 125 g / m ² , thickness 0.
13 mm) with eight fiber axes aligned and laminated at 130 ° C x 1
It was molded under the condition of time to obtain a carbon fiber reinforced epoxy resin molded plate. This plate, so that the fiber axis direction is the longitudinal direction,
A long fiber-reinforced resin body having a rectangular cross section was cut into a length of 600 mm and a width of 20 mm. Twenty-four long bodies are arranged in the width direction, and a non-woven fabric composed of nylon 12 fibers (manufactured by Daicel Chemical Industries, Ltd., basis weight 30 g / m ² ) is placed on the width 50
The tape cut into mm was arranged at a pitch of 70 mm, and the tape was thermocompression bonded by a press heated to 100 ° C. to obtain the concrete structure reinforcing material of FIG.

The above fiber-reinforced resin elongated body is embedded in a concrete cylinder having a diameter of 150 mmφ and a length of 600 mm, in which a 5 mmφ reinforcing bar is embedded and tension (prestress of 350 kgf / cm ² is applied when the tension is removed) is applied to this reinforcing bar. Was wound (FIG. 2; a concrete cylinder is not shown). At this time, the long body that remained unwound could be easily removed by inserting a cutter into the connecting portion made of the non-woven fabric and cutting. The beginning and end of the winding were temporarily fixed with packing tape to prevent the winding from collapsing.

Carbon fiber having an elastic modulus of 24 t / mm ² (TR30G manufactured by Mitsubishi Rayon Co., Ltd.) and a low-viscosity room temperature curing epoxy resin having a viscosity of 20 poise at 20 ° C. (Ep801P / B002W manufactured by Yuka Shell Epoxy Co., Ltd. = 100/48)
(Parts by weight) was wound while being impregnated so that the resin content was about 45% by weight (FIG. 3; concrete cylinder not shown). This was left to cure at room temperature for 24 hours.

Example 2 Carbon fibers having an elastic modulus of 24 t / mm ² (TR30G manufactured by Mitsubishi Rayon Co., Ltd.) were aligned in one direction and impregnated with a 100 ° C.-cured vinyl ester resin.
It is hardened while being drawn from a 10 mmφ mold heated to 130 ° C., and then drawn out (with a carbon fiber volume content of 61%,
A diameter of 9.5 mmφ) was obtained. 40 pultrusion molding rods were arranged in the width direction and entwined with polyester fibers (manufactured by Mitsubishi Rayon Co., Ltd., number of filaments 48, fineness 150 denier) at a pitch of 12 mm to obtain a concrete structure reinforcing material shown in FIG.

The fiber-reinforced resin elongated body was embedded in a concrete cylinder having a diameter of 150 mmφ and a length of 600 mm, in which a 5 mmφ rebar was embedded and tension (prestress of 350 kgf / cm ² was applied when the tension was removed) was applied to the rebar. Was wound (FIG. 5; a concrete cylinder is not shown). At this time, the unwound elongated body could be easily removed by inserting a cutter into the connecting portion made of the non-woven fabric and cutting. The beginning and end of the winding were temporarily fixed with packing tape to prevent the winding from collapsing.

Carbon fiber having an elastic modulus of 24 t / mm ² (TR30G manufactured by Mitsubishi Rayon Co., Ltd.) and a low-viscosity room temperature curing epoxy resin having a viscosity of 20 poise at 20 ° C. (Ep801P / B002W manufactured by Yuka Shell Epoxy Co., Ltd. = 100/48)
(Parts by weight) was wound while being impregnated so that the resin content was about 45% by weight (FIG. 6; concrete cylinder not shown). This was left to cure at room temperature for 24 hours.

[0025]

According to the present invention constructed as described above,
It is possible to obtain a concrete structure reinforcing material used for reinforcing an existing concrete structure and a reinforcing method using the same, which does not require construction by a skilled person and has a certain reinforcing effect regardless of the skilled person.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a plurality of elongated fiber-reinforced resin bodies (rectangular cross section) arranged in the width direction, which are connected by a nonwoven fabric.

FIG. 2 is a conceptual diagram in which a long fiber-reinforced resin body is arranged around concrete (not shown).

FIG. 3 is a conceptual diagram of winding a resin-impregnated reinforcing fiber bundle around the outside of a long fiber-reinforced resin body.

FIG. 4 is a conceptual diagram in which a plurality of long fiber-reinforced resin bodies (circular cross sections) arranged in the width direction are entwined with fibers and connected.

FIG. 5 is a conceptual diagram in which a long fiber-reinforced resin body is arranged around concrete (not shown).

FIG. 6 is a conceptual diagram of winding a resin-impregnated reinforcing fiber bundle around the outside of a long fiber-reinforced resin body.

[Explanation of symbols]

 1 Fiber-reinforced resin long body 2 Non-woven fabric 3 Fiber 4 Reinforced fiber impregnated with resin

Claims (2)

[Claims] 1. A concrete structure reinforcing material comprising a plurality of long fiber-reinforced resin elongated bodies arranged in the width direction, which are adjacent to each other, and which are connected by a flexible material. 2. A concrete structure for reinforcing a concrete structure to be reinforced, wherein a plurality of long fiber reinforced resin members arranged in the width direction and adjacent to each other are connected by a flexible material. A method for reinforcing a concrete structure, comprising winding a reinforcing fiber bundle impregnated with an uncured resin around the outer periphery of a material wound in such a manner that the longitudinal directions of both are aligned, and then hardening the resin.