JP2019044542A - Concrete column reinforcement device - Google Patents

Abstract

To provide a concrete column reinforcement device which can complete most of works in a manufacturing plant, can be easily installed by performing works that are not affected by training degrees of workers at a construction site, and can reduce cost, and to provide a concrete column reinforcement device which can be easily removed for maintenance and can be reused after removal, is excellent in economical efficiency and has high strength.SOLUTION: A concrete column reinforcement device 10 includes a strand structure 20 formed by bundling a plurality of reinforcement fiber wire members having a core wire formed of a bundle of long-fiber reinforced fibers, an outer layer coating the core wire and a solidification material impregnated in the core wire and the outer layer, where the solidification material is a thermoplastic epoxy resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete column reinforcement.

  Existing infrastructure, such as road and railway pillars, may become degraded after a considerable amount of time has passed since its installation. However, rebuilding a new infrastructure not only causes traffic problems, but also costs a lot. Therefore, in most cases, the existing infrastructure is reinforced to compensate for their earthquake resistance and strength.

  As a reinforcing tool for reinforcing an infrastructure, one made of a material mainly made of a steel containing metal such as iron is widely used (see, for example, Patent Document 1). However, many metals change in volume (expansion) with temperature. Therefore, when reinforcing a concrete column with a reinforcing device, it is necessary to fasten a screw with a force that is stronger than necessary to fix the auxiliary device to the concrete column. Therefore, in summer and winter, the reinforcing power exerted by the reinforcing device is different, and there are times when the reinforcing device can not exhibit its own strength.

  On the other hand, there is known a reinforcing method using a fiber-reinforced composite material in which a resin is impregnated into a reinforcing fiber as a member replacing metal. For example, there is known a technique of reinforcing a concrete column by winding a carbon fiber material organized in a string shape or a band shape around a concrete column at a predetermined interval (see, for example, Patent Documents 2 and 3).

  Furthermore, thermoplastic resin is mixed with reinforcing fibers and organized, and the reinforcing fibers are heated at the construction site to melt the thermoplastic resin, and the reinforcing fibers are wound around the entire surface of the concrete column to reinforce the concrete column. It is known (for example, refer to patent documents 4).

Japanese Patent Laid-Open No. 2000-352111 JP, 2008-063745, A JP 2007-332667 A JP-A-6-288101

  When reinforcing fibers such as carbon fibers are directly installed on a concrete column, the reinforcing fibers may be broken if the cross section of the concrete column is rectangular. Therefore, it is necessary to chamfer the corners of the concrete column and round the concrete column. Further, when a thermosetting resin is used as a resin to be impregnated into the reinforcing fiber, the operation of impregnating the reinforcing fiber with the resin is complicated, the working efficiency is low, and the process becomes long, resulting in a large cost. Furthermore, when the reinforcing fiber is impregnated with the resin immediately before attaching the reinforcing tool to the concrete column, the reinforcing fiber may not be uniformly impregnated with the resin depending on the degree of training of the worker.

  In addition, in the method of spirally winding reinforcing fibers around the entire surface of a concrete column, it is difficult to check even if an abnormality such as a crack occurs in the concrete column. Also, even if an abnormality is found, since reinforcing fibers are wound around the entire surface of the concrete column, it is not possible to carry out the repair work with a part of the reinforcing device attached to the concrete column, and all reinforcing devices are It must be removed.

  In addition, since the thermosetting resin hardens once it is processed at the construction site, it must be processed reliably. In addition, once the reinforcing fiber impregnated with the thermosetting resin is removed at the time of inspection or the like, the reinforcing fiber can not be reformed, so a new reinforcing tool must be installed. Thus, the reinforcing fiber impregnated with the thermosetting resin is difficult to reuse. Further, a reinforcing fiber impregnated with a general-purpose thermoplastic resin is not preferable because the durability is low.

  The present invention has been proposed in view of such conventional circumstances, and it is possible to complete most of the work in the manufacturing plant, and it is easy to do the work which does not depend on the degree of training of the workers at the construction site It is an object of the present invention to provide a concrete column reinforcement that can be installed on the ground and cost can be reduced. Another object of the present invention is to provide a highly economical high strength concrete column reinforcing device which can be easily removed for maintenance and reused after removal.

In order to solve the said subject, this invention has the following structures.
[1] Strand structure formed by bundling a plurality of reinforcing fiber wires comprising a core wire composed of a bundle of reinforcing fibers of long fibers, an outer layer covering the core wire, and a solidifying material impregnated in the core wire and the outer layer The concrete column reinforcing device, wherein the solidifying material is a thermoplastic epoxy resin.
[2] The concrete column reinforcing device according to the above [1], comprising a corner support made of a fiber reinforced composite material in which bundles of reinforcing fibers are solidified by a solidifying material.
[3] The concrete column reinforcing device according to the above [1] or [2], comprising a joint portion connecting the strand structure.
[4] The concrete column reinforcing device according to any one of the above [1] to [3], wherein the length of the reinforcing fiber is 1 mm or more.
[5] The concrete column reinforcing device according to the above [2], wherein the bundle of reinforcing fibers contained in the corner support is a strip.

  According to the present invention, most of the work can be completed in the manufacturing plant, and it can be easily installed in the construction site by performing the work which does not depend on the degree of training of the worker, thereby reducing the cost. It is possible to provide a concrete column reinforcement that can Further, according to the present invention, it is possible to provide a highly economical high strength concrete column reinforcing device which can be easily removed for maintenance and reused after removal.

It is a top view which shows schematic structure of the concrete pillar reinforcing tool which concerns on 1st Embodiment. It is a perspective view showing a schematic structure of a strand structure in a concrete pillar reinforcing device concerning a 1st embodiment. The schematic structure of the reinforcing fiber wire in the concrete pillar reinforcement instrument which concerns on 1st Embodiment is shown, (a) is a top view, (b) is sectional drawing. It is a perspective view which shows schematic structure of the edge part of the strand structure in the concrete pillar reinforcement instrument which concerns on 1st Embodiment. It is a perspective view which shows schematic structure of the corner support body in the concrete pillar reinforcement tool which concerns on 1st Embodiment. It is a perspective view which shows schematic structure of an example of the reinforcement fiber bundle contained in the corner support body in the concrete pillar reinforcement tool which concerns on 1st Embodiment. It is a perspective view which shows schematic structure of an example of the coupling | joint part in the concrete pillar reinforcement tool which concerns on 1st Embodiment. It is a perspective view which shows schematic structure of the other example of the coupling | joint part in the concrete pillar reinforcement tool which concerns on 1st Embodiment. It is a top view which shows schematic structure of the concrete pillar reinforcement tool which concerns on 2nd Embodiment. It is a top view which shows schematic structure of the edge part of the strand structure in the concrete pillar reinforcement tool which concerns on 2nd Embodiment.

An embodiment of a concrete column reinforcing device of the present invention will be described.
The present embodiment is specifically described in order to better understand the spirit of the invention, and does not limit the present invention unless otherwise specified.

First Embodiment
[Concrete column reinforcement]
FIG. 1 is a plan view showing a schematic configuration of a concrete column reinforcing device of the present embodiment.
As shown in FIG. 1, the concrete column reinforcing device 10 of the present embodiment includes a strand structure 20, a corner support 30, and a joint 40.

  In the concrete column reinforcing device 10 of the present embodiment, the corner supports 30 are disposed at the four corners of the concrete column 1000 as a fitting. In addition, two corner structure U-shaped strand structures 20 are disposed in a direction perpendicular to the axial direction of the concrete column 1000 via the corner support 30. Furthermore, the ends of the two strand structures 20 are connected and fixed to the joint portion 40. At both ends of the strand structure 20, a receiving jig 21 and a screw-shaped fixing tool 22 are provided, and the fixing tool 22 is fixed by a joint portion 40. By installing the strand structure 20, the corner support 30, and the joint portion 40 in this manner, the concrete column reinforcing device 10 can reinforce the concrete column 1000.

  By installing the concrete column reinforcing device 10 of the present embodiment, the toughness and shear properties of the concrete column 1000 can be reinforced.

In the concrete column reinforcing device 10 of the present embodiment, the strand structure 20 includes a bundle of reinforcing fibers (hereinafter referred to as "reinforcing fiber bundle"). In addition, the corner support 30 preferably includes a reinforcing fiber bundle.
The content of reinforcing fibers in the strand structure 20 and the corner support 30, that is, the fiber volume content (Vf value) is preferably 20% to 80%, and more preferably 30% to 70%. More preferably, it is 40% to 60%.
If the fiber volume content in the strand structure 20 and the corner support 30 is equal to or more than the lower limit value, the strand structure 20 and the corner support 30 can ensure sufficient mechanical strength (tensile strength). On the other hand, if the fiber volume content in the strand structure 20 and the corner support 30 is equal to or less than the upper limit value, the strand structure 20 and the corner support 30 can be stably manufactured. In addition, the reinforcing fiber bundle inside the strand structure 20 is not cut, and the original mechanical strength of the reinforcing fiber bundle can be maintained.

The fiber volume content (Vf value) in the strand structure 20 and the corner support 30 can be calculated by the following equation (1).
Vf value (%) = (W-.rho.3.times.V) / [(. Rho.2-.rho.3) .times.V] (1)

In the above equation (1), W is the mass (g) of the strand structure 20 or the corner support 30, V is the volume (cm ³ ) of the strand structure 20 or the corner support 30, ρ 2 is the density of reinforcing fibers ( g / cm ³ ), ρ ³ represent the density (g / cm ³ ) of the resin used for the strand structure 20 and the corner support 30.

"Strand structure"
FIG. 2: is a perspective view which shows schematic structure of the strand structure in the concrete pillar reinforcement instrument of this embodiment. FIG. 3: shows schematic structure of the reinforcing fiber wire in the concrete pillar reinforcement instrument of this embodiment, (a) is a top view, (b) is sectional drawing. FIG. 4: is a perspective view which shows schematic structure of the edge part of the strand structure in the concrete pillar reinforcement instrument of this embodiment.

As shown in FIG. 2, the strand structure 20 in the concrete column reinforcing device 10 of the present embodiment is formed by bundling and twisting a plurality of reinforcing fiber wires 50.
As shown in FIG. 3, the reinforcing fiber wire 50 includes a core 52 formed by bundling reinforcing fibers 51 of long fibers, an outer layer 53 covering the core 52, and a solidified material 54 impregnated in the core 52 and the outer layer 53. Equipped with

  The number of reinforcing fiber wires 50 constituting the strand structure 20 is not particularly limited as long as it is two or more, and the intended performance of the concrete column reinforcing device 10 of the present embodiment or the concrete column 1000 to be installed It is appropriately determined according to the size and the like. The number of reinforcing fiber wires 50 is usually 2 to 40, and preferably 7 to 37.

The reinforcing fiber bundle is used as a core 52. An outer layer 53 formed by winding fibers around the outer periphery of the core wire 52 is provided on the outer periphery of the core wire 52 so that the core wire 52 does not fall apart. In addition, the solidified material 54 impregnated in the outer layer 53 penetrates between the reinforcing fibers 51 forming the core 52, that is, to the inside of the core 52. Thereby, in the reinforcing fiber wire 50, it is preferable that the reinforcing fiber bundle forming the core 52 and the fibers constituting the outer layer 53 be bonded and integrated by the solidifying material 54. By integrating the core wire 52 and the fibers constituting the outer layer 53, the strength of the reinforcing fiber wire 50 is further improved.
In the strand structure 20, the core wire 52 is solidified by the solidifying material 54 in a state in which a predetermined number of twists are applied. The number of twists of the core wire 52 is the resistance to bending stress of the reinforcing fiber wire 50 to be obtained, the ability of the reinforcing fiber 51 to prevent loose wires, the strength to the twisting of the reinforcing fiber 51 (the reinforcing fiber is not broken by twisting), and It is determined in consideration of preventing the reinforcing fiber bundle from jumping out (eyeing) between the outer layers in the state of being covered with the outer layer before application. The number of twists of the core wire 52 is preferably 2 times / m to 50 times / m, more preferably 5 times / m to 40 times / m, and 10 times / m to 30 times / m Is more preferred. The twisting direction of the core wire 52 is not particularly limited, and may be S (right) twist or Z (left) twist.

The core wire 52 is formed by bundling a plurality of (usually several thousands to several tens of thousands of) reinforcing fibers 51, and is a filament having a circular or flat cross section.
As the reinforcing fiber 51, a fiber also referred to as a super fiber is used. Such fibers include, for example, carbon fibers, basalt fibers, para-aramid fibers, meta-aramid fibers, ultra-high-molecular-weight polyethylene fibers, polyarylate fibers, polyparaphenylene benzoxazole (PBO) fibers, polyphenylene sulfide (PPS) Fibers, polyimide fibers, fluorine fibers, polyvinyl alcohol (PVA fibers) and the like can be mentioned. In the core wire 52, the above-described fibers may be used alone, or two or more types may be mixed and used. Further, in the core wire 52, the above-described fibers and at least one of the organic fibers and the inorganic fibers other than the above may be mixed and used in a range in which the strength and bendability are not impaired.

  As the carbon fiber, for example, a polyacrylonitrile (PAN) -based carbon fiber or a pitch-based carbon fiber is used. It is preferable to use PAN-based carbon fiber from the viewpoint of the balance between the strength and elastic modulus of a molded article containing carbon fiber.

  As the carbon fiber bundle formed by bundling carbon fibers, it is necessary in the concrete column reinforcing device 10 that carbon fiber 6000 (6 K), 12000 (12 K), 24000 (24 K), etc. supplied from a carbon fiber manufacturer is required. Depending on the strength to be made, one or a plurality of bundles are used.

The core 52 may be formed by bundling the reinforcing fibers 51 by impregnating the reinforcing fibers 51 with a sizing agent or a bundling agent so that the reinforcing fibers 51 constituting the core 52 can be easily gathered.
As the sizing agent and the sizing agent, it is preferable to use one having high affinity to the below-described solidifying material.

The core wire 52 obtained by arranging a plurality of reinforcing fibers 51 in one direction is preferably a bundle of 1,000 or more single fibers of the reinforcing fibers 51, and a bundle of 10,000 or more More preferable.
The upper limit of the number of single fibers of the reinforcing fiber 51 is not particularly limited. In the case where the bundle of reinforcing fibers 51 is not opened, the upper limit of the number of single fibers of the reinforcing fibers 51 is about 500,000. When the bundle of reinforcing fibers 51 is opened and used, the number of single fibers of the reinforcing fibers 51 may be more.

  The outer layer 53 is a tubular structure. Examples of the tubular structure include a circular knitting structure in which fibers are knitted up, and a braided structure in which fibers are assembled in a tubular shape. The outer layer 53 preferably has a braided structure from the viewpoint of hardness, strength, form stability and the like as the outer layer 53. By forming the outer layer 53 into a braided structure, the surface of the reinforcing fiber bundle forming the core 52 can be covered to such an extent that it can not be visually confirmed. Thus, the outer layer 53 binds the core 52 and also functions as a protective layer for protecting the reinforcing fibers 51 constituting the core 52 inside the outer layer 53. Therefore, even if the strand structure 20 contacts with a sharp object such as gravel after the concrete column reinforcing tool 10 is installed on the concrete column 1000, the strand structure 20 can be prevented from being broken. Moreover, since it is not necessary to provide a protective layer in the strand structure 20 separately, the strand structure 20 can be made thinner and manufacturing cost can be reduced.

  As a braided structure, although a round hit structure, a square hit structure, and a flat hit structure are mentioned, it is preferable to set it as a round hit structure from a viewpoint of a shape and stability. The number of strikes may be, for example, a hard hit, 8 strikes, 16 strikes, 24 strikes, etc. The preferred number of strikes may be appropriately selected according to the desired thickness and width of the reinforcing fiber wire 50.

As a fiber used for the outer layer 53, a flexible thing is preferable. Examples of such fibers include synthetic fibers made of polyamide (nylon etc.), vinylon, polyacrylic, polypropylene, vinyl chloride, aramid, cellulose, polyester, polyacetal, etc., regenerated fibers such as rayon, and semi-synthetics such as acetate The fibers include natural fibers such as fiber, silk, wool, hemp, cotton and the like.
Further, as the fibers used for the outer layer 53, although it depends on the heat resistance and the state of solidification of the solidified material 54, when heat is applied in the manufacturing process or use environment of the reinforcing fiber wire 50, fibers having excellent thermal stability. Is preferred. As a fiber which is excellent in heat stability, polyester fiber, glass fiber, carbon fiber, and basalt fiber are preferred, and glass fiber is more preferred. By using the fiber excellent in thermal stability, when heat is applied, the occurrence of the displacement between the core wire 52 and the outer layer 53 can be suppressed, and the strand structure 20 can exhibit stable tensile strength.

The fibers used for the outer layer 53 may be twisted or untwisted.
By applying the solidifying material 54, the core 52 having the outer layer 53 becomes a reinforced fiber wire 50 in which the core 52 and the outer layer 53 are bonded and integrated, thereby further improving the strength. From the viewpoint of strength, the solidifying material 54 to be applied is impregnated to the inside of the reinforcing fiber wire 50, and the fibers constituting the outer layer 53 and the core 52 inside the reinforcing fiber wire 50 are adhesively bonded and integrated. preferable.

The solidifying material 54 is a thermoplastic epoxy resin.
As a thermoplastic epoxy resin, a reaction type resin which is initiated or reaction is accelerated to be cured by adding a curing agent, an additive such as a catalyst, a polymerization initiator, a polymerization accelerator or the like, or by heating. It has thermoplasticity even after curing. Moreover, as a thermoplastic epoxy resin, the thing of linear molecular structure is more preferable by at least one process of heat processing and pressurization processing, maintaining thermoplasticity.

  By using such a thermoplastic epoxy resin, it is possible to process each fiber-reinforced composite material into any shape at any time after manufacturing a fiber-reinforced resin material consisting of the reinforcing fiber 51 and the thermoplastic epoxy resin Therefore, the risk of holding a large amount of inventory can be reduced. Moreover, you may mix | blend another thermoplastic resin with a thermoplastic epoxy resin in the range which does not deviate from the objective of this invention.

  The reactive thermoplastic epoxy resin is liquid at normal temperature before being cured with a curing agent, and can be dissolved or dispersed in a solvent. Therefore, the interior of the core wire 52 can be impregnated with the thermoplastic epoxy resin. Therefore, since the thermoplastic epoxy resin can be present up to the inside of the core wire 52, the core wire 52 and the thermoplastic epoxy resin are sufficiently entangled (contact with each other). Thus, the concrete column reinforcing device 10 of the present embodiment has excellent strength. In the concrete column reinforcing device 10 of the present embodiment, the core wire 52 is also easily moved (deformed) along with the movement (deformation) of the thermoplastic epoxy resin at the time of at least one of the heat treatment and the pressure treatment. Excellent.

  Since a general thermoplastic resin is melted and used by heat, it is not easy to impregnate the thermoplastic resin to the inside of the core wire 52 even when a thin carbon fiber bundle is used as the core wire 52 . In particular, in the core wire 52 in which the reinforcing fibers 51 are tightly bundled as in the concrete column reinforcing device 10 of the present embodiment, the thermoplastic resin is present only in the vicinity of the surface of the core wire 52. In the concrete column reinforcing device 10 of the present embodiment, a thermoplastic epoxy resin is used as the solidifying material 54, and after impregnating the thermoplastic epoxy resin to the inside of the core 52, the thermoplastic epoxy resin is reacted and cured. Therefore, in the concrete column reinforcing device 10 of the present embodiment, the thermoplastic epoxy resin can be impregnated to the inside of the reinforcing fiber wire 50 and the core wire 52 inside the reinforcing fiber wire 50.

  Some thermoplastic resins change their chemical structure after reaction. For example, epoxy resins become phenoxy resins after reaction. That is, the reaction-type thermoplastic epoxy resin in the present embodiment also includes one that becomes a phenoxy resin after the reaction.

Moreover, you may mix | blend a thermosetting resin with a thermoplastic epoxy resin in the range which does not deviate from the objective of this invention.
In the case where only a thermosetting resin is used, the material in which the thermosetting resin is added to the reinforcing fiber is stored without being cured, and when it is formed into a shape of a concrete column reinforcing instrument at any time, Until curing, freezing or refrigerated storage is required, which increases the storage load.

  Since the concrete column reinforcing device 10 of this embodiment uses a thermoplastic epoxy resin, molding is possible even after curing the thermoplastic epoxy resin, as compared with a fiber reinforced composite material composed only of a thermosetting resin. It is possible, it is not necessary to perform storage at low temperature until molding like thermosetting epoxy resin, it is easy to use without problems of storage period, does not require a long curing time, and is excellent also from the viewpoint of productivity ing.

Furthermore, as shown in FIG. 4, the strand structure 20 in the concrete column reinforcing device 10 of the present embodiment has a receiving jig 21 for fixing at the end 20A. The end portion 20A and the receiving jig 21 are provided at both ends of the strand structure 20.
A screw-shaped fixing tool 22 such as a cut-off bolt is provided on the tip end surface 21 a of the receiving jig 21 in a protruding manner. By connecting and fixing the fixture 22 to the joint portion 40, the concrete column reinforcing device 10 is installed on the concrete column 1000 to reinforce the concrete column 1000.
In addition, as shown in FIG. 1, the strand structure 20 is provided with a receiving jig 21 and is an end portion 20A disposed from the central portion of the outer side surface 1000a of the concrete column 1000 to the vicinity of the corner 1000A of the concrete column 1000. 20A and corner portions 20B and 20B arranged in contact with the rounded surface of the corner support 30 (curved along the surface on the corner 30A side of the corner support 30) and the outer surface of the concrete column 1000 And a central portion 20C disposed over substantially the entire length in the width direction of 1000a. Further, as shown in FIG. 1, the strand structure 20, the length of the end portion 20A _{L 1,} the length _{L 2} of the corner 20B, the length of the central portion 20C and _{L 3.}

As a raw material of the receiving jig 21 and the fixing tool 22, any metal such as iron, chromium, nickel, titanium, molybdenum, zinc, or an alloy thereof is used.
Moreover, as a raw material of the receiving jig 21 and the fixing tool 22, the fiber reinforced composite material which consists of a reinforced fiber bundle and a solidification material is used. As a fiber reinforced composite material, the thing similar to the raw material of the corner support body 30 mentioned later and the coupling part 40 is used.

  The strand structure 20 is formed in a U-shape in a plan view according to the length of the outer periphery of the reinforcing concrete column 1000, and is installed along the outer periphery of the concrete column 1000. That is, as shown in FIG. 1, the two U-shaped strand structures 20 in plan view are used for both end screws such as turnbuckles and spacers at the center portions of the opposing outer surfaces 1000 a and 1000 a of the concrete column 1000. Is connected to the joint portion 40 of the

  The strand structure 20 is a core wire 52 made of reinforcing fiber bundles and an outer layer 53 that covers the core wire 52, and the reinforcing fiber wire 50 impregnated with the solidifying material 54 is twisted together, so the temperature difference It does not expand or contract, and does not need to be fixed with a stronger force than necessary.

The tensile strength of the strand structure 20, that is, the tensile strength in the longitudinal direction of the strand structure 20 is preferably 20 kN to 220 kN, and more preferably 40 kN to 200 kN. If the tensile strength of the strand structure 20 is 20 kN or more, the strand structure 20 has sufficient reinforcing performance to the concrete column 1000 and does not break. On the other hand, if the tensile strength of the strand structure 20 is 220 kN or less, the balance between productivity and strength of the strand structure 20 can be maintained.
In the concrete column reinforcing device 10 of the present embodiment, the tensile strength is measured in accordance with JIS K7164 "plastic-test method of tensile properties-".

As a method of forming the strand structure 20, for example, a method of bundling a necessary number of reinforcing fiber wires 50 and twisting the whole of the bundled reinforcing fiber wires 50, one reinforcing fiber wire 50 to be a core, Or a method of twisting the reinforcing fiber wire 50 as a core and the other fiber reinforced composite material (reinforcing fiber wire 50) so as to form a structure surrounded by a plurality of other fiber reinforced composite materials (reinforcing fiber wire 50) It can be mentioned.
The number of twists of the strand structure 20 is preferably 1.1 times / m to 50 times / m.

"Corner support"
FIG. 5 is a perspective view showing a schematic configuration of a corner support in the concrete column reinforcing device of the present embodiment. FIG. 6 is a perspective view showing a schematic configuration of an example of the reinforcing fiber bundle included in the corner support in the concrete column reinforcing device of the present embodiment.

The corner support 30 in the concrete column reinforcing device 10 of the present embodiment is formed in an L shape so as to be in close contact with the corner 1000A of the concrete column 1000 and the outer surface 1000a connecting with the corner 1000A.
As shown in FIG. 5, the corner support 30 in the concrete column reinforcing device 10 of the present embodiment is made of a fiber reinforced composite material in which the reinforcing fiber bundle 31 is solidified by the solidifying material 32. In addition, the corner support 30 is one in which reinforcing fiber bundles 31 are randomly stacked in the solidifying material 32. In detail, each reinforcing fiber bundle 31 is in a state of being slightly inclined at random and slightly folded with respect to the shape of the corner support 30. The reinforcing fiber bundle 31 is formed by arranging a plurality of reinforcing fibers in one direction.

  In the concrete column reinforcing device 10 of the present embodiment, the strand structure 20 is formed in a U-shape in a plan view. Therefore, the corner support 30 is also used as a fitting for dispersing the pressure applied from the strand structure 20 to the four corners of the concrete column 1000 at each corner 20B of the strand structure 20 at the four corners of the concrete column 1000. .

  When the corner support 30 is used as a fitting, the outer side of the corner support 30 (the side in contact with the strand structure 20) in order to enhance the tensile strength of the strand structure 20 in the fitting portion of the corner support 30. It is preferable to round off the corner 30A of. The radius R of the corner portion 30A of the corner support 30 is preferably 5 mm to 1000 mm, more preferably 50 mm to 900 mm, and still more preferably 100 mm to 800 mm. If R is 5 mm or more, the strand structure 20 has sufficient tensile strength in the fitting portion of the corner support 30. On the other hand, if R is 1000 mm or less, it is preferable from the viewpoint of formability and productivity of the corner support 30. In addition, R of corner | angular part 30A is a curvature radius of corner | angular part 30A.

  The reinforcing fiber bundle 31 in which a plurality of reinforcing fibers are arranged in one direction is obtained by aligning the fiber axial directions of the plurality of reinforcing fibers constituting the reinforcing fiber bundle 31. The reinforcing fiber bundle 31 and the reinforcing fibers constituting the reinforcing fiber bundle 31 may be bent or meandered as long as the fiber axial directions of the reinforcing fibers constituting the reinforcing fiber bundle 31 are substantially aligned. In particular, in the case of a molded body formed by heat treatment and pressure treatment, it has a shape that bends, meanders, or partially collapses and spreads due to the concavo-convex shape of the molded body, the reinforcing fibers and the entanglement of bundles thereof. There are many reinforcing fibers and reinforcing fiber bundles 31. Further, the concept that the reinforcing fiber bundles 31 are randomly stacked includes the reinforcing fibers and the reinforcing fiber bundles 31 in a state of being bent or meandering and deformed by the pressure treatment or the like. Also, the reinforcing fiber bundles in the corner support 30 are not short cut and randomly laminated like the reinforcing fiber bundles 31, but are obtained by arranging reinforcing fibers of long fibers in one direction and laminating them. It may be

The reinforcing fiber bundle 31 may be one that has been subjected to an opening treatment, and may be a non-twisted yarn, a twisted yarn, or a flame-retardant yarn.
As a reinforcing fiber which comprises the reinforcing fiber bundle 31, the thing similar to the reinforcing fiber which comprises the strand structure 20 is used.

  The length of the reinforcing fibers contained in the fiber-reinforced composite material constituting the corner support 30 is preferably 1 mm or more, more preferably 5 mm or more, and still more preferably 5 mm to 500 mm. If the length of the reinforcing fibers included in the fiber reinforced composite material is 1 mm or more, the corner support 30 has sufficient tensile strength.

The reinforcing fiber bundle 31 contained in the corner support 30 is preferably a strip-shaped reinforcing fiber bundle (hereinafter, referred to as a “strip-like reinforcing fiber bundle”) 33, as shown in FIG.
The strip-like reinforcing fiber bundle 33 is a composite in which a plurality of reinforcing fibers are arranged in one direction, and the reinforcing fibers are integrated with the solidifying material.
The strip reinforcing fiber bundle 33 preferably has a length in the fiber axis direction of 5 mm to 500 mm, and preferably a width of 1 mm to 300 mm. In addition, it is preferable that the length of the reinforcing fiber bundle 33 in the form of a strip is in the form of a strip that is longer than the length in the width direction. If the length in the fiber axial direction of the strip-like reinforcing fiber bundle 33 is 5 mm or more, the strip-like reinforcing fiber bundle 33 has sufficient strength. On the other hand, when the length in the fiber axial direction of the strip-like reinforcing fiber bundle 33 is 500 mm or less, the variation in tensile strength and the anisotropy of the tensile strength do not occur in the strip-like reinforcing fiber bundle 33.

  From the viewpoint of mechanical strength of the corner support 30 and its stability, the length in the fiber axial direction of the strip reinforcing fiber bundle 33 is more preferably 10 mm to 100 mm, and the width of the strip reinforcing fiber bundle 33 is More preferably, it is 3 mm to 30 mm.

  The length of the reinforcing fibers constituting the strip-shaped reinforcing fiber bundle 33 is preferably 1 mm or more, more preferably 5 mm or more, and still more preferably 5 mm to 500 mm. That is, the length of each reinforcing fiber constituting the strip-shaped reinforcing fiber bundle 33 is substantially the same as the length of the strip-shaped reinforcing fiber bundle 33 formed by bundling a plurality of reinforcing fibers in one direction. preferable.

  The thickness of the strip-shaped reinforcing fiber bundle 33 is not particularly limited, but is preferably shorter than the length and width of the strip-shaped reinforcing fiber bundle 33 in the fiber axial direction. The thickness of the strip-like reinforcing fiber bundle 33 is preferably 0.02 mm to 10 mm, and more preferably 0.2 mm to 5 mm from the viewpoint of the mechanical strength of the corner support 30.

  Similar to the strand structure 20 and the corner support 30, the fiber volume content (Vf value) in the corner support 30 is preferably 20% to 80%, and more preferably 30% to 70%. And 40% to 60%.

  As the solidifying material 32, one similar to the solidifying material 54 constituting the strand structure 20 is used.

"Joint"
FIG. 7 is a perspective view showing a schematic configuration of an example of a joint portion in the concrete column reinforcing device of the present embodiment. FIG. 8 is a perspective view showing a schematic configuration of another example of the joint portion in the concrete column reinforcing device of the present embodiment.

  The joint portion 40 in the concrete column reinforcing device 10 of the present embodiment is for fixing and reinforcing the strand structure 20 to the concrete column 1000.

  As the joint part 40, for example, a turnbuckle type for both end screws shown in FIG. 7 or a spacer type for both end screws shown in FIG. 8 can be mentioned.

  As described above, in the case where the strand structure 20 having a U-shape in plan view is installed along the outer periphery of the concrete column 1000, the ends of the strand structure 20 are the opposing outer surfaces 1000 a of the concrete column 1000. , 1000a are connected to the joint portion 40 and fixed to the concrete column 1000.

  As a raw material of the joint part 40, arbitrary metals, such as iron, chromium, nickel, titanium, molybdenum, zinc, or its alloy are used. Moreover, as a raw material of the joint part 40, the fiber reinforced composite material which consists of the reinforcement fiber bundle 31 which comprises the corner support body 30, and the solidification material 32 is used.

  When a fiber reinforced composite material is used as the material of the joint portion 40, the fiber volume content (Vf value) in the joint portion 40 is 20% to 80% as in the strand structure 20 and the corner support 30. Preferably, it is 30% to 70%, and more preferably 40% to 60%.

  In the concrete column reinforcing device 10 of the present embodiment, since at least the strand structure 20 includes reinforcing fibers and is excellent in mechanical strength, it is the same as the steel reinforcing device used for reinforcing existing concrete columns. Can be attached to a concrete column to reinforce the concrete column.

  The concrete column reinforcing device 10 of the present embodiment includes a strand structure 20, a corner support 30, and a joint portion 40, and the joint portion 40 connects the two strand structures 20. Therefore, the concrete column reinforcing device 10 of this embodiment not only needs a large-scale installation when attaching to a concrete column, but also performs pretreatment such as chamfering on an existing concrete column having a rectangular cross section. It can be installed without. Further, the concrete column reinforcing device 10 of the present embodiment can be easily removed from the concrete column when inspecting an abnormality such as a crack generated in the concrete column or performing maintenance.

  In the concrete column reinforcing device 10 of the present embodiment, since the strand structure 20 is made of the reinforcing fiber bundle and the solidifying material, it does not expand or shrink due to the temperature difference like metal, and the concrete column is made stronger than necessary. There is no need to fix it. Thereby, the burden on the concrete column by the concrete column reinforcing device 10 can be reduced.

  The concrete column reinforcing device 10 of the present embodiment uses a thermoplastic epoxy resin as a solidifying material that constitutes the strand structure 20 and the like. Therefore, while maintaining sufficient strength, according to the shape of the intended concrete column, once manufactured, it can be deformed into any shape, and can be reused after removal. In addition, the concrete column reinforcing device 10 of the present embodiment can complete almost all operations except attachment to a concrete column in a manufacturing plant, and can be easily bent according to the shape of a target concrete column. It is also possible to perform only the necessary work at the construction site. In addition to being able to reduce the burden on the operator at the construction site, the concrete column reinforcing device 10 of the present embodiment is lighter in weight as compared with a conventional steel-reinforcement device, so the work of installation Efficiency can be improved.

[Method of manufacturing concrete column reinforcement]
Next, a method of manufacturing the concrete column reinforcing device of the present embodiment will be described. In addition, the manufacturing method of the concrete pillar reinforcement instrument which concerns on this embodiment is not limited to the following method.

"Production method of strand structure"
The long fiber reinforcing fibers are bundled to form a reinforcing fiber bundle.
Next, the fiber is wound around the reinforcing fiber bundle to form a tubular braided structure, whereby an outer layer composed of the tubular braided structure is obtained. Thereby, a braided structure in which the reinforcing fiber bundle is covered with the outer layer is obtained.

As the reinforcing fibers and the fibers constituting the outer layer, the same ones as the concrete column reinforcing device of the above-mentioned embodiment are used.
Moreover, as a braided structure, the structure similar to the concrete pillar reinforcement device of the above-mentioned this embodiment is mentioned.

  The braided structure is then provided with a thermoplastic epoxy resin. Specifically, a thermoplastic epoxy resin solution is used to impregnate the reinforcing fiber bundle constituting the braided structure with the thermoplastic epoxy resin.

  The thermoplastic epoxy resin solution contains at least a reactive thermoplastic epoxy resin, a solvent for dissolving or dispersing the thermoplastic epoxy resin, and a curing agent. The thermoplastic epoxy resin solution in the present embodiment is not limited to a solution in which a solute is completely dissolved in a solvent, and may be an emulsion or dispersion.

  Examples of the solvent contained in the thermoplastic epoxy resin solution include water, dimethylformamide, toluene, xylene, cyclohexane, methyl acetate, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, methanol and ethanol. Butanol, isopropyl alcohol, methyl cellosolve, cellosolve, anone and the like.

  Examples of the curing agent contained in the thermoplastic epoxy resin solution include aliphatic polyamines, polyaminoamides, ketimines, aliphatic diamines, aromatic diamines, imidazoles, amine compounds such as tertiary amines, phosphoric acid compounds, and acid anhydrides. Compounds, mercaptan compounds, phenol resins, amino resins, dicyandiamide, Lewis acid complex compounds and the like can be mentioned.

  The thermoplastic epoxy resin solution does not deviate from the object of the present invention, and additives such as a catalyst, a polymerization initiator, a polymerization accelerator, an antioxidant, an ultraviolet absorber, a pigment, a thickener, an emulsifier, and a dispersant are included. May be included.

The viscosity of the thermoplastic epoxy resin solution is preferably 5 mPa · s to 1000 mPa · s. The viscosity of the thermoplastic epoxy resin solution is more preferably 10 mPa · s or more, and still more preferably 50 mPa · s or more, from the viewpoint of the amount of the thermoplastic epoxy resin applied to the braid structure. The viscosity of the thermoplastic epoxy resin solution is more preferably 500 mPa · s or less, and still more preferably 200 mPa · s or less.
If the viscosity of the thermoplastic epoxy resin solution is 5 mPa · s or more, a sufficient amount of the thermoplastic epoxy resin can be easily applied to the braid structure. On the other hand, if the viscosity of the thermoplastic epoxy resin solution is 1000 mPa · s or less, the thermoplastic epoxy resin can be easily penetrated to the inside of the reinforcing fiber bundle constituting the braided structure.

  As a method of applying the thermoplastic epoxy resin to the braid structure, for example, a dip method in which the braid structure is dipped in a thermoplastic epoxy resin solution, a dip after immersing the braid structure in a thermoplastic epoxy resin solution and then squeezing with a mangle or the like. Nip method, transfer method to make thermoplastic epoxy resin solution adhere to kiss roll or gravure roll and transfer thermoplastic epoxy resin to braid structure from kiss roll etc., thermoplastic epoxy resin solution in mist form to braid structure The spray method etc. which are given are mentioned.

  In the dip method, transfer method, spray method, etc., the thermoplastic epoxy resin is pushed to the inside of the braid structure and the reinforcing fiber bundle by bringing the braid structure to which the thermoplastic epoxy resin solution adheres into contact with a die roll or the like. The amount of the thermoplastic epoxy resin applied to the braid structure can be adjusted by removing the excess thermoplastic epoxy resin.

  In addition, the thermoplastic epoxy resin in the thermoplastic epoxy resin solution is adjusted by adjusting the application amount of the thermoplastic epoxy resin solution to the braid structure so that the reinforcing fiber wire has the above-mentioned suitable Vf value or by the compounding ratio of the solvent. It is preferable to adjust the content of

In this embodiment, since the viscosity of the thermoplastic epoxy resin solution is low, the thermoplastic epoxy resin can penetrate to the inside of the reinforcing fiber bundle that constitutes the braided structure.
After applying the thermoplastic epoxy resin to the braided structure, it is preferable to perform at least one of drying and heat treatment. Drying and heat treatment may be performed simultaneously or separately. By subjecting the braided structure to which the thermoplastic epoxy resin has been applied, at least one of drying and heat treatment, a reinforced fiber wire can be obtained.

The drying temperature and the drying time are appropriately adjusted according to the type of thermoplastic epoxy resin, curing agent or solvent.
The drying temperature is preferably 40 ° C to 120 ° C, and more preferably 50 ° C to 100 ° C. The drying time is preferably 1 minute to 1 hour, and more preferably 10 minutes to 30 minutes.
The heat treatment temperature and the heat treatment time are appropriately adjusted according to the type of thermoplastic epoxy resin, curing agent or solvent.
The heat treatment temperature is preferably 120 ° C. to 250 ° C., and more preferably 120 ° C. to 180 ° C. The heat treatment time is preferably 1 minute to 1 hour, and more preferably 3 minutes to 40 minutes.
The ranges of the above-mentioned drying temperature, drying time, heat treatment temperature and heat treatment time are preferable from the viewpoint of the grade and productivity of the reinforcing fiber wire.

Next, a plurality of reinforcing fiber wires are bundled and set in a twisting machine, and while being heated, the entire bundled reinforcing fiber wires are twisted to form a strand structure.
The heating temperature of the bundled reinforcing fiber wire is preferably 80 ° C. to 200 ° C., and the heating time is preferably 3 minutes to 40 minutes.
The twisting direction of the strand structure is not particularly limited, and may be S (right) twist or Z (left) twist.

  In this manner, a plurality of reinforcing fiber wires, each including the core wire made of a bundle of reinforcing fibers of long fibers, the outer layer covering (binding) the core wire, and the solidified material impregnated in the core wire and the outer layer, are bundled A strand structure is obtained.

"Method of manufacturing corner support"
First, a fiber reinforced composite material to be a corner support is produced.
A fiber reinforced composite material is produced by impregnating a reinforcing fiber bundle with a thermoplastic epoxy resin. Specifically, a fiber reinforced composite material is produced by impregnating a reinforcing fiber bundle with a thermoplastic epoxy resin using a thermoplastic epoxy resin solution.

As a thermoplastic epoxy resin solution, the thing similar to the thing in the manufacturing method of the above-mentioned strand structure is used.
As a method of applying the thermoplastic epoxy resin to the reinforcing fiber bundle, the same method as the method of applying the thermoplastic epoxy resin to the braided structure in the method of manufacturing a strand structure described above is used.

  Then, the fiber reinforced composite material is formed into an arbitrary length to obtain, for example, a strip-like fiber reinforced composite material.

  Next, the strip-like fiber-reinforced composite material is laminated to form a laminate, and the laminate is formed into a desired shape of a corner support by heating and pressing to form a corner support by cooling. Get

  In the corner support, it is preferable to randomly laminate strip-like fiber reinforced composite materials. Specifically, a strip-shaped fiber-reinforced composite material including a plurality of reinforcing fiber bundles and a thermoplastic epoxy resin which are independent of each other may be freely dropped or stacked and then vibrated to be laminated. preferable.

Examples of the method of heating and pressing the laminate of the fiber reinforced composite material include a die pressing method, an autoclave method, heating, a cold pressing method, injection molding, and extrusion molding.
Alternatively, the fiber-reinforced composite material may be formed into a plate, and then the plate-like fiber-reinforced composite material may be formed into a desired shape by heating and pressing again using a roll forming method.

  The heating temperature is, for example, 150 ° C to 400 ° C. The heating time is, for example, 1 minute to 24 hours. The pressure at the time of pressurization is, for example, 1 MPa to 500 MPa. In addition, if pressurization is performed in a vacuum state, generation of voids (voids) in the fiber-reinforced composite material can be suppressed.

  At the stage of obtaining the fiber reinforced composite material, the thermoplastic epoxy resin may be completely reacted, but the reaction of the thermoplastic epoxy resin is stopped at a certain level (or the reaction rate of the thermoplastic epoxy resin is decreased) Remaining in position, the laminate of fiber reinforced composite material may be molded to fully react the thermoplastic epoxy resin in making the corner support.

"Manufacturing method of joint part"
When the joint portion is made of a fiber-reinforced composite material including a reinforcing fiber bundle and a solidifying material, the joint portion is manufactured by the same manufacturing method as the above-described corner support.

[How to reinforce concrete columns]
Next, with reference to FIG. 1, the reinforcement method of the concrete column 1000 using the concrete column reinforcement 10 of this embodiment is demonstrated.

First, corner supports 30 are disposed at the four corners of the concrete column 1000 to be reinforced.
Next, two corner structure U-shaped strand structures 20 are arranged in a direction perpendicular to the axial direction of the concrete column 1000 via the corner support 30. The strand structure 20 is formed in a shape corresponding to the width and the shape of the outer side surface 1000 a of the concrete column 1000.

  Next, the end portions of the two strand structures 20 are temporarily connected to the joint portion 40 at the central portions of the opposing outer surfaces 1000 a and 1000 a of the concrete column 1000 by the fixture 22, and two concrete columns 1000 are obtained. The strand structure 20 is temporarily fixed.

  Finally, the fixtures 22 of the strand structure 20 temporarily connected to the joint portion 40 are tightened to fix the two strand structures 20 to the concrete column 1000. Thus, the reinforcement of the concrete column 1000 by the concrete column reinforcing device 10 is completed.

When fastening the fixing tool 22 of the strand structure 20 temporarily connected to the joint part 40 and fixing the two strand structure 20 to the concrete column 1000, the tightening torque for the fixing tool 22 is 150 N · m to 350 N ··· It is preferably m.
If the torque is 150 N · m or more, the tensile strength of the strand structure 20 can be sufficiently exhibited. On the other hand, when the torque is 350 N · m or less, breakage of the joint portion 40 and the fixture 22 provided in the strand structure 20 can be prevented.

  According to the method of reinforcing a concrete column of the present embodiment, the concrete column reinforcing device 10 is installed on the concrete column 1000 without providing a large work space or performing complicated work at a construction site. Thus, the durability of the concrete column 1000 can be reinforced more easily than a method using a conventional metal reinforcing device or a reinforcing device containing reinforcing fibers. Further, according to the method of reinforcing a concrete column of the present embodiment, not only is it easy to visually recognize changes such as cracks in the concrete column 1000 after the concrete column reinforcing device 10 is installed, but also removal of the concrete column reinforcing device 10 It can be easily reused.

Second Embodiment
[Concrete column reinforcement]
FIG. 9 is a plan view showing a schematic configuration of the concrete column reinforcing device of the present embodiment. FIG. 10: is a top view which shows schematic structure of the edge part of the strand structure in the concrete pillar reinforcement instrument of this embodiment. 9 and FIG. 10, the same code | symbol is attached | subjected to the structure same as the concrete column reinforcement instrument of 1st Embodiment shown in FIG. 1, and the overlapping description is abbreviate | omitted.
As shown in FIG. 9, the concrete column reinforcing device 100 of the present embodiment includes a strand structure 110, a corner support 30, and a joint portion 120.

  In the concrete column reinforcing device 100 of the present embodiment, the corner supports 30 are disposed at the four corners of the concrete column 1000 as a fitting. A joint portion 120 is provided on each of the two outer side surfaces (the side surface opposite to the surface in contact with the concrete column 1000) 30a of the corner support 30. That is, the corner support 30 and the joint portion 120 are integrated. In addition, as shown in FIG. 10, the strand structure 110 has receiving jigs 111 for fixing at both ends 110A. On the tip end surface 111 a of the receiving jig 111, a screw-shaped fixing tool 112 such as a cut-off bolt is protruded. In addition, the strand structure 110 is linearly formed in accordance with the width of the outer side surface 1000 a of the concrete column 1000. Furthermore, in the strand structure 110, both ends 110A are connected and fixed to the joint portion 120. Specifically, fixtures 112 provided at both ends 110 A of the strand structure 110 are connected and fixed to the joint portion 120. By installing the strand structure 110, the corner support 30, and the joint portion 120 in this manner, the concrete column reinforcing device 100 can reinforce the concrete column 1000.

  As the strand structure 110, the same one as the strand structure 20 described above is used.

As the joint part 120, the thing of the turnbuckle type for one end screw, the spacer type for one end screw, etc. are mentioned.
As a raw material of the joint part 120, the thing similar to the above-mentioned joint part 40 is used.

  According to the concrete column reinforcing device 100 of the present embodiment, the same effect as the concrete column reinforcing device 10 of the first embodiment described above can be obtained.

[Method of manufacturing concrete column reinforcement]
The concrete column reinforcing device 100 of the present embodiment can be manufactured by the same manufacturing method as that of the concrete column reinforcing device 10 of the first embodiment described above.

[How to reinforce concrete columns]
According to the concrete column reinforcing device 100 of the present embodiment, similar to the concrete column reinforcing device 10 of the first embodiment described above, the concrete column 1000 can be reinforced.

  Hereinafter, the present invention will be more specifically described by way of examples, but the present invention is not limited to the following examples. Also, in the following examples, "parts" refers to parts by mass.

Example 1
"Manufacture of strand structure"
The Example 1 corresponding to the concrete pillar reinforcement shown in FIG. 9 is shown.
As a reinforcing fiber bundle, one obtained by twisting 30 times a bundle of 24000 single fibers of carbon fiber (carbon fiber: bundle 24K of PAN-based carbon fiber (Toray Industries, Inc., Torayca T700 SC)) Was used.
Glass fiber was used as the fiber of the outer layer.
A braiding machine is used to cover the entire outer periphery of the carbon fiber bundle in a braided manner with 12 × 2 batting using a braiding machine (24 hammering machine), and a braid consisting of a carbon fiber bundle and glass fiber covering it I got a structure.
In the obtained braided structure, the coverage of the surface of the carbon fiber bundle by the outer layer was approximately 100%, and the carbon fiber bundle inside was not visible.

  Next, while drawing out the braided structure wound around the drum, the thermoplastic epoxy resin solution shown below was applied to the braided structure by the dip nip method.

Viscosity of thermoplastic epoxy resin solution: 15 mPa · s or less (less than the measurement limit of the device)
Composition of thermoplastic epoxy resin solution: 100 parts by mass of thermoplastic epoxy resin (Reactive resin: DENATITE XNR 6850 V, manufactured by Nagase ChemteX Co., Ltd.), Curing agent (DENATITE XNH 6850 V, manufactured by Nagase ChemteX Co., Ltd.) 6.5 parts by mass, 1.6 parts by mass of methyl ethyl ketone

  The viscosity of the thermoplastic epoxy resin solution was measured using a B-type viscometer (TVB-15 type viscometer, manufactured by Toki Sangyo Co., Ltd.) and rotor No. It is a value measured at room temperature with the rotational speed of the rotor set to 12 rpm using 20.

  After applying a thermoplastic epoxy resin solution to the braided structure, heat treatment was carried out at 150 ° C. for 120 minutes, followed by cooling to obtain a reinforced fiber wire having a braided outer layer.

  Another reinforcing fiber wire similarly formed is cut perpendicular to its length direction, and the cut surface is cut 100 times using a scanning electron microscope (trade name: S3000H, manufactured by Hitachi Science Systems, Inc.) As a result of observation, it was confirmed that the thermoplastic epoxy resin penetrated to the center of the carbon fiber bundle.

Then, seven strands of the obtained reinforcing fiber wire were bundled to obtain a strand structure of Example 1. Specifically, one reinforcing fiber wire is used as a core, which is disposed so as to be surrounded by six reinforcing fiber wires, and the bundle of the reinforcing fiber wires is heated to 120 ° C. in the Z direction 5 times / The strand structure was obtained by twisting at m.
The obtained strand structure was cut to each length according to the width of the outer surface of the concrete column. Next, a steel pipe having an outer diameter of 27 mm, an inner diameter of 18 mm, and a length of 240 mm is fixed as the receiving jig at both ends of the strand structure, and the end of the receiving jig (the end opposite to the strand structure) Section) was connected to the M20 sectioning bolt. Moreover, it was 40% when Vf value of the obtained strand structure was measured.

"Production of corner support"
Next, the same carbon fiber bundle as that used for manufacturing the strand structure was used without opening.
While drawing out the carbon fiber bundle wound around the drum, the reaction type thermoplastic epoxy resin solution was applied to one side of the carbon fiber bundle by a kiss roll.
As the thermoplastic epoxy resin solution, the same one as used in the production of the strand structure was used.

The upper and lower surfaces of the carbon fiber bundle to which the thermoplastic epoxy resin solution is applied are brought into contact with four rolls (two times the upper surface of the carbon fiber bundle and two times the lower surface: the upper surface and the lower surface are alternately contacted twice) After sinter, it was dried at 60 ° C. for 20 minutes, and then heat treatment was carried out at 150 ° C. for 20 minutes to react the thermoplastic epoxy resin.
Thereafter, the carbon fiber bundle to which the thermoplastic epoxy resin solution was applied was cooled at normal temperature, and was wound on a drum to apply the thermoplastic epoxy resin to a carbon fiber bundle having a length of 50 m, a width of 4 mm, and a thickness of 0.38 mm. A tape-like fiber reinforced composite material was obtained.

Next, the tape-like fiber-reinforced composite material is cut so as to have a length of 20 mm to 30 mm almost perpendicularly to the fiber axis direction of carbon fibers, and the length is 20 mm to 30 mm, width 4 mm, thickness 0.38 mm A strip-like fiber reinforced composite material was obtained.
The Vf value of the obtained strip-like fiber-reinforced composite material was 40%.
In addition, since the carbon fiber is a long fiber, the length of the carbon fiber in the obtained strip-like fiber reinforced composite material was the same as the length of the fiber reinforced composite material, and was 20 mm to 30 mm.

  As a result of observing the cut surface of another strip-like fiber-reinforced composite material similarly formed by using the above-mentioned scanning electron microscope at 100 times, the thermoplastic epoxy resin penetrates to the center of the carbon fiber bundle. Was confirmed.

  Thereafter, strip-like fiber-reinforced composite materials were randomly stacked in a stainless steel mold, and heat treatment and pressure treatment were performed at 200 ° C. and 20 MPa for 5 minutes using a vacuum press. Then, after cooling, the molded body was taken out from the stainless steel mold.

  As a result, each strip-like fiber-reinforced composite material is randomly stacked inside the thermoplastic epoxy resin (a little random inclination to the shape of the corner support on which each strip-like fiber-reinforced composite material is formed) To obtain a corner support which is folded over one another.

  Another corner support similarly formed is cut, and the cut surface is observed using the above-mentioned scanning electron microscope. As a result, the carbon fiber is closely packed in the thermoplastic epoxy resin, and the corner It was confirmed that the inside of the support was fine. Moreover, it was 40% when Vf value of the strand structure was measured.

  Thereafter, a stainless steel jig corresponding to the M20 cut-off bolt was attached to the outer surface of the corner support and fixed with a bolt. Thereby, the joint part integral with the corner support was obtained.

  A joint integral with the above-mentioned strand structure, corner support and corner support was connected to obtain a concrete column reinforcement and the concrete column reinforcement was attached to the concrete column.

Example 2
"Manufacture of strand structure"
The Example 2 corresponding to the concrete pillar reinforcement shown in FIG. 1 is shown.
As the reinforcing fiber bundle, a bundle of 24000 single fibers of carbon fiber (carbon fiber: bundle 24K of PAN-based carbon fiber (Pyrophile (registered trademark) MR60H24P manufactured by Mitsubishi Chemical Corporation)) was used.
The strand structure of Example 2 was obtained in the same manner as Example 1 except that this carbon fiber bundle was used. A reinforcing fiber wire forming another strand structure similarly formed is cut perpendicularly to the length direction, and the cut surface is cut with a scanning electron microscope (trade name: S3000H, manufactured by Hitachi Science Systems, Ltd.) As a result of observation using the above, it was confirmed that the thermoplastic epoxy resin penetrated to the center of the carbon fiber bundle. Moreover, it was 40% when Vf value of the strand structure was measured.
The obtained strand structure was cut to a length that is U-shaped in a plan view according to the width of the outer side surface of the concrete column. That is, as shown in FIG. 1, the length of the strand structure (the length of a portion (end portion 20A arranged from the central portion of the outer surface 1000a of the concrete column 1000 to the vicinity of the corner 1000A of the concrete column 1000) A portion (corner portion 20B) length L _{2 of the} L ₁ + corner support 30 disposed in contact with the R-face of the corner support 30 × 2 + substantially the entire length of the lateral surface 1000 a of the concrete column 1000 It cut | disconnected to the length used as length L _{3 of} site | part (central part 20C). Next, a steel pipe having an outer diameter of 27 mm, an inner diameter of 18 mm, and a length of 240 mm is fixed as the receiving jig at both ends of the strand structure, and the end of the receiving jig (the end opposite to the strand structure) Section) was connected to the M20 sectioning bolt.

"Production of corner support"
Next, the same carbon fiber bundle as that used for manufacturing the strand structure was used without opening.
While drawing out the carbon fiber bundle wound around the drum, the reaction type thermoplastic epoxy resin solution was applied to one side of the carbon fiber bundle by a kiss roll.
As the thermoplastic epoxy resin solution, the same one as used in the production of the strand structure was used.

The upper and lower surfaces of the carbon fiber bundle to which the thermoplastic epoxy resin solution is applied are brought into contact with four rolls (two times the upper surface of the carbon fiber bundle and two times the lower surface: the upper surface and the lower surface are alternately contacted twice) After sinter, it was dried at 60 ° C. for 20 minutes, and then heat treatment was carried out at 150 ° C. for 20 minutes to react the thermoplastic epoxy resin.
Thereafter, the carbon fiber bundle to which the thermoplastic epoxy resin solution was applied was cooled at normal temperature, and was wound on a drum to apply the thermoplastic epoxy resin to a carbon fiber bundle having a length of 50 m, a width of 40 mm and a thickness of 0.38 mm. A tape-like fiber reinforced composite material was obtained.

Next, the tape-like fiber-reinforced composite material is cut so as to have a length of 20 mm to 30 mm almost perpendicularly to the fiber axis direction of carbon fibers, and the length is 20 mm to 30 mm, width 4 mm, thickness 0.38 mm A strip-like fiber reinforced composite material was obtained. Further, the Vf value of the obtained strip-like fiber-reinforced composite material was measured and found to be 40%.
In addition, since the carbon fiber is a long fiber, the length of the carbon fiber in the obtained strip-like fiber reinforced composite material was the same as the length of the fiber reinforced composite material, and was 20 mm to 30 mm.

  Thereafter, strip-like fiber-reinforced composite materials are randomly stacked in a stainless steel mold having a corner R of 100 mm, and heat treatment at 200 ° C. and 20 MPa for 5 minutes using a vacuum press and Pressure treatment was performed. Then, after cooling, the molded body was taken out from the stainless steel mold.

  As a result, each strip-like fiber-reinforced composite material is randomly stacked inside the thermoplastic epoxy resin (a little random inclination to the shape of the corner support on which each strip-like fiber-reinforced composite material is formed) To obtain a corner support which is folded over one another.

  The other corner support similarly formed is cut, and the cut surface is observed using a scanning electron microscope (trade name: S3000H, manufactured by Hitachi Science Systems, Inc.). As a result, the carbon fiber is thermoplastic. It was confirmed that the epoxy resin was tightly packed, and the inside of the corner support was compact.

"Joint"
As a joint part, a stainless steel spacer of M20 female screw type on both sides was used.

  The above-mentioned strand structure, corner support and joints were connected to obtain a concrete column reinforcement and the concrete column reinforcement was attached to the concrete column.

  The concrete column reinforcing device of the present invention can compensate for the corrosion resistance, shear resistance and toughness of the concrete column at a high level, since the problem such as rust does not occur depending on the use environment like metal. Furthermore, the concrete column reinforcing device of the present invention can be reused because it can be reshaped after removal as well as easy to perform maintenance. Therefore, the concrete column reinforcing device of the present invention has a high industrial applicability because it can be constructed at a lower cost than constructing a new concrete column and without stopping traffic.

DESCRIPTION OF SYMBOLS 10 ... Concrete column reinforcement, 20 ... Strand structure, 20A ... End part, 20B ... Corner part, 21 ... Receiving jig, 22 ... Fixture, 30 ... Corner support body 30A: corner portion 31: reinforcing fiber bundle 32: solidifying material 33: strip-like reinforcing fiber bundle 40: joint portion 50: reinforcing fiber wire , 51: reinforcing fiber, 52: core wire, 53: outer layer, 54: solidifying material, 100: concrete column reinforcing device, 110: strand structure, 120: joint portion , 1000 ... concrete column, 1000 A ... corner part.

Claims (5)

A strand structure comprising a plurality of core fibers each comprising a bundle of reinforcing fibers of long fibers, an outer layer covering the core strands, and a reinforcing material impregnated with the core core and the outer layer, bundled together
The concrete column reinforcing device according to claim 1, wherein the solidifying material is a thermoplastic epoxy resin.   The concrete column reinforcing device according to claim 1, further comprising a corner support made of a fiber reinforced composite material in which bundles of reinforcing fibers are solidified by a solidifying material.   The concrete column reinforcing device according to claim 1 or 2, further comprising a joint portion connecting the strand structure.   The concrete pillar reinforcing device according to any one of claims 1 to 3, wherein a length of the reinforcing fiber is 1 mm or more.   The concrete column reinforcing device according to claim 2, wherein the bundle of reinforcing fibers contained in the corner support is a strip shape.

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