JP2010024620A - Bonded structure of carbon fiber anchor and its forming method - Google Patents

Abstract

An object of the present invention is to use a cage-like carbon fiber tape that not only excels in tape shape stability by bundling carbon fiber yarns into a cage shape, but also has excellent flexibility, handleability and formability. Provided is a carbon fiber anchor adhesion structure capable of obtaining high mechanical properties (particularly adhesive strength) in the carbon fiber anchor.
In an adhesive structure in which a carbon fiber anchor is bonded to a concrete structure which is an adherend or a carbon fiber sheet attached to a concrete structure, the carbon fiber anchor has a carbon fiber bundle parallel in one direction. The cage-like carbon fiber tapes arranged in the above are impregnated with a resin to form fan-shaped fan portions and rod-shaped embedded portions, and the carbon fiber anchor and the adherend are The adhesive layer is formed by bonding with a resin, and the average thickness of the adhesive layer is in the range of 0 to 3 mm, and the maximum thickness is in the range of 0 to 6 mm.
[Selection] Figure 5

Description

  The present invention relates to an adhesion structure of a carbon fiber anchor for repairing and reinforcing an adherend by adhering to an adherend such as a concrete structure or a concrete structure to which a carbon fiber sheet is attached, and a method for forming the same. .

  For concrete structures such as piers, chimneys, and buildings, measures for repair and reinforcement have become necessary due to the review of seismic standards after many years of use. As a typical method for repairing and reinforcing such a concrete structure, a fiber sheet method is used. This fiber sheet construction method is a construction method in which a fiber sheet is impregnated and solidified and bonded on site to be repaired and reinforced with a composite material made of fiber reinforced plastic (hereinafter also abbreviated as “FRP”). When repairing and reinforcing a concrete structure with a fiber sheet, a resin (for example, an epoxy resin, a urethane resin, an acrylic resin, or the like) serving as a matrix resin for FRP is applied to the fiber sheet, and the fiber is coated with the resin. Sheets are laminated, and a fiber sheet is impregnated with a roller or the like so that the resin distribution is uniform, thereby forming a composite material. In some cases, a composite material in which a fiber sheet is impregnated with a matrix such as mortar, concrete, and asphalt and solidified is used.

  Examples of the fiber sheet used in these methods include woven fabrics, knitted fabrics, and mesh fabrics (for example, Patent Documents 1 to 9). Among them, a knitted fabric is preferably used when the sheet is used as a carbon fiber anchor by converging and forming a rod shape or a fan shape (for example, Patent Documents 10 and 11) instead of using the sheet as a sheet. For example, Patent Documents 12 to 15 propose a warp knitting tape in which a plurality of reinforcing fiber yarns are warped and inserted at predetermined intervals into a warp knitted fabric knitted in the vertical direction. In any case, various aspects have been proposed in view of each of form stability, formability, matrix resin impregnation, and reinforcing effect.

  On the other hand, at construction sites, the length and form of use vary depending on the structure (adhered body) that requires repair and reinforcement, and the contractor can use fiber tape (length, width, shape, etc.) according to the situation. Must be cut and shaped on the spot to produce a carbon fiber anchor. Therefore, the handleability of the fiber tape greatly affects not only the workability (time and man-hours) but also the workability, and the reinforcement effect (particularly the bond strength between the carbon fiber anchor and the adherend) is the original purpose. It may be significantly reduced.

However, in the conventional techniques including Patent Documents 12 to 15 described above, a technique has been found that brings out the original reinforcing effect when it becomes a carbon fiber anchor at the time of construction even if the performance of the fiber tape itself is improved. There is no actual situation. In other words, there is a craving for a technology that can satisfy the handling performance as a fiber tape in construction work and that can reinforce the effect of carbon fiber anchors, which is the original purpose of repair and reinforcement, especially the bonding strength between carbon fiber anchors and adherends. Has been.
Japanese Utility Model Publication No. 63-042195 Japanese Utility Model Publication No. 02-106477 Japanese Patent Laid-Open No. 03-028155 JP-A 64-040632 Japanese Patent Laid-Open No. 10-102792 JP 2001-226849 A JP 2001-329466 A JP 2002-020953 A JP 2006-225812 A JP 09-158492 A JP 2004-027728 A Japanese Patent Laid-Open No. 06-101143 Japanese Patent Laid-Open No. 10-037051 JP 2004-360106 A JP 2006-124945 A

  The object of the present invention is to solve the above-mentioned problems, and in particular, by focusing the carbon fiber yarns in a wrinkle shape, it not only has excellent form stability of the tape, but also has flexibility, handleability and formability. Provided carbon fiber anchor adhesion structure that can obtain high mechanical properties (especially adhesive strength) in carbon fiber anchors constructed using saddle-like carbon fiber tapes (particularly in the tape width direction). There is to do.

  Another object of the present invention is to provide a method for forming an adhesive structure using the carbon fiber anchor.

In order to achieve the above object, the present invention has the following constitution. That is,
(1) An adhesive structure in which a carbon fiber anchor is bonded to a concrete structure that is an adherend or a carbon fiber sheet that is attached to the concrete structure, and the carbon fiber anchor has a one-way orientation of the carbon fiber bundle. Are impregnated with a resin in a cage-like carbon fiber tape arranged in parallel, and formed into a shape having a fan portion shaped into a fan shape and an embedded portion converged in a rod shape, the carbon fiber anchor and the The adherend is bonded with the resin to form an adhesive layer, the average thickness of the adhesive layer is in the range of 0 to 3 mm, the maximum thickness is in the range of 0 to 6 mm, Bond structure of carbon fiber anchor.

(2) The carbon fiber anchor is configured by a laminated body of saddle-like carbon fiber tapes, and in the bonded carbon fiber anchor, a part of the carbon fiber bundle of a specific layer enters another layer. Adhesive structure of carbon fiber anchor.

(3) The saddle-like carbon fiber tape is a warp knitting tape comprising a ground knitting yarn and a weft insertion yarn of auxiliary fibers and a warp insertion yarn of carbon fiber, and the ground knitting yarn forms a chain stitch structure And a weft insertion yarn which is a synthetic fiber inserted in a transverse direction between adjacent chain stitch structures, in which a carbon fiber bundle is inserted as a warp insertion thread inserted in the warp direction in the chain stitch structure. The adhesion structure of the carbon fiber anchor according to (1) or (2), wherein the warp knitting tape is formed by integrating the chain stitch structure.

(4) The flatness of the carbon fiber bundle in the bonded carbon fiber anchor has a form of 0.5 or more and less than 2, the average major axis is 3 mm or less, and the affixed to the concrete structure A carbon fiber sheet is formed by arranging carbon fiber bundles in parallel in one direction and integrated with auxiliary fibers in a direction crossing the carbon fiber bundle, and the flatness of the carbon fiber bundle in the bonded carbon fiber sheet. Bonding of carbon fiber anchors according to any one of (1) to (3), wherein the rate is 2 or more and 20 or less, and the average thickness corresponding to the minor axis is 0.1 mm or more and 0.5 mm or less Construction.

(5) The cocoon-like carbon fiber tape has a chain stitch structure of 5 to 10 course / cm, and the ground knitting yarn and the weft insertion yarn are crimped yarns of synthetic fibers (1) to ( 4) The carbon fiber anchor bonding structure according to any one of the above.

(6) Ratio W1 / W0 of the standing width W1 when the saddle-like carbon fiber tape is allowed to stand with no external force in the tape width direction and the maximum tape width W0 when an external force is applied in the tape width direction = The adhesion structure of the carbon fiber anchor according to any one of (1) to (5), which is 0.5 to 0.95.

(7) In the saddle-like carbon fiber tape, the awakening fiber having a melting point lower than that of the auxiliary fiber is aligned with the warp insertion yarn, or is covered with the warp insertion yarn or the ground knitting yarn. The adhesion structure of the carbon fiber anchor according to any one of (1) to (6), wherein the squeezing fibers are fused to make a chain stitch structure.

(8) When forming the carbon fiber anchor bonding structure according to any one of (1) to (7), the following steps (A), (B), (C) and (D) are performed. A method for forming an adhesive structure of carbon fiber anchors.
(A) A cutting step of unwinding the cage-like carbon fiber tape wound around the tubular body and cutting it at a predetermined length (B) An impregnation step of impregnating the cut cage-like carbon fiber tape with a resin in advance (C) resin Embedding a fan-shaped carbon fiber tape impregnated with a fan on a concrete structure that is an adherend or a carbon fiber sheet affixed to a concrete structure and fan-shaped fan parts and rods Forming step (D) forming a carbon fiber anchor having a shape having a portion, forming an adhesive layer of the resin between the carbon fiber anchor and the adherend, and an average thickness of the adhesive layer of 0 to 3 mm Adhesion process to make the maximum thickness within the range of 0-6mm within the range

(9) In forming the carbon fiber tape by laminating the saddle-like carbon fiber tape in the shaping step (C), the saddle-like carbon fiber tape is laminated on the adherend one by one, and the specific layer The method for forming a carbon fiber anchor bonding structure according to (8), wherein the carbon fiber anchor is formed so that a part of the carbon fiber bundle enters the other layer.

(10) In forming the carbon fiber anchor by laminating the cage-like carbon fiber tape in the shaping step (C), the resin is applied again to each layer of the cage-like carbon fiber tape to form carbon. The method for forming a carbon fiber anchor bonding structure according to (8) or (9), wherein the fiber anchor is formed.

(11) Through the impregnation step (B) and the shaping step (C), the weight of the resin with respect to the weight of the cage-like carbon fiber tape used is in the range of 1 to 1.8 times that of the cage-like carbon fiber tape. , (8)-(10) The formation method of the adhesion structure of the carbon fiber anchor in any one of.

(12) In the shaping step (C), the number of carbon fiber bundles is adjusted so that the cage-like carbon fiber tape expands and contracts in the tape width direction and falls within a predetermined size range of the adherend. The formation method of the adhesion structure of the carbon fiber anchor in any one of (8)-(11) which forms an anchor.

  The bonding structure of the carbon fiber anchor of the present invention is such that the carbon fiber anchor is impregnated with a resin in a cage-like carbon fiber tape in which carbon fiber bundles are arranged in parallel in one direction, and is formed into a fan shape and a rod shape. The carbon fiber anchor and the adherend are bonded with a resin to form an adhesive layer, and the average thickness of the adhesive layer is in the range of 0 to 3 mm, the maximum thickness. Is within the range of 0 to 6 mm, it is possible to exhibit an excellent repair and reinforcement effect such as suppressing the fragile cohesive failure of the adhesive layer itself and exhibiting high adhesive strength.

  This effect is particularly because the carbon fiber anchor is composed of a laminate of saddle-like carbon fiber tapes, and in the bonded carbon fiber anchor, a part of the carbon fiber bundle of a specific layer enters each other layer, The destruction of the carbon fiber anchor itself can be suppressed, and a higher repair and reinforcement effect can be exhibited.

  Further, in the carbon fiber sheet, the ground knitting yarn forms a chain stitch structure, and the carbon fiber yarn is inserted as a warp insertion thread inserted in the warp direction in the chain stitch structure. If the weft insertion yarn, which is a synthetic fiber inserted in the weft direction, is formed by integrating the chain stitch structure to form a tape, not only the form stability but also flexibility, handleability and formability ( In particular, it is excellent in formability in the tape width direction, and can easily follow the shape of an adherend such as a concrete structure.

  Such an effect is that the flatness of the carbon fiber bundle in the bonded carbon fiber anchor has a form of 0.5 or more and less than 2, and the major axis is 3 mm or less, and / or the above saddle-like carbon The fiber tape has a warp knitting structure of 6 to 10 course / cm, the ground knitting yarn and the weft insertion yarn are crimped yarns of synthetic fibers, and / or the cocoon-like carbon fiber tape has a tape width. The ratio W1 / W0 = 0.5 to 0.95 between the stationary width W1 when stationary with no external force in the direction and the maximum tape width W0 when external force is applied in the tape width direction, Higher expression can be achieved.

  Also, the carbon fiber sheet that is affixed to the concrete structure with resin is an arrangement in which carbon fiber bundles are arranged in parallel in one direction and integrated with auxiliary fibers in a direction across the carbon fiber bundle. If the flatness of the carbon fiber bundle in the obtained carbon fiber sheet has a form of 2 or more and 20 or less, and the thickness corresponding to the minor axis is 0.1 mm or more and 0.5 mm or less, the above-mentioned cage-like carbon fiber It is easy to follow the tape, an adhesive structure that exhibits high adhesive strength can be formed, and a high repair and reinforcement effect can be realized.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing an embodiment of the adhesive structure of the present invention in which an adherend is repaired and reinforced. The bonding structure 10 of the carbon fiber anchor 20 in the present embodiment is a carbon fiber anchor 20 that is made by adhering the carbon fiber anchor 20 to a concrete structure 1a, 1b or a concrete structure 1a, which is an adherend (repair reinforcement), with a resin. This is an adhesive structure bonded to the fiber sheet 1c.

  FIG. 2 is a schematic plan view showing an embodiment of the carbon fiber anchor 20 according to the present invention. 2a, 2b and 2c are warp insertion yarns (carbon fiber bundles), 4a, 4b and 4c are weft insertion yarns (auxiliary). Fiber), 5a indicates resin, 21 and 23 indicate fan portions, and 22 indicates an embedded portion.

  FIG. 3 is a schematic plan view showing another embodiment of the carbon fiber anchor 30 in the present invention. 2g, 2h, 2i are warp insertion yarns (carbon fiber bundles), 4g, 4h, 4i are weft insertion yarns ( Auxiliary fibers), 5b represents resin, 31 represents a fan portion, and 32 represents an embedded portion.

  FIG. 4 is a schematic plan view showing one embodiment of a cage-like carbon fiber tape used in the present invention. The carbon fiber anchor 20 (30) is a cage-like carbon fiber tape 40 in which carbon fiber bundles 2a, 2b, 2c (2d, 2e, 2f) are arranged in parallel in one direction (in parallel in the illustrated example). Are impregnated with resin 5a (5b) to form fan portions 21 and 23 (31) shaped like a fan and embedded portions 22 (32) converged in a rod shape. In FIG. 4, 3a, 3b and 3c are ground knitting yarns (auxiliary fibers), 4d, 4e and 4f are weft insertion yarns (auxiliary fibers), and La is the pitch of the knitting carbon fiber tape ground knitting yarns. ing.

  FIG. 5 is a schematic sectional view showing one embodiment of the carbon fiber anchor bonding structure 50 of the present invention, and FIG. 6 is a schematic sectional view showing another embodiment of the carbon fiber anchor bonding structure 60 of the present invention. It is. In the present invention, the carbon fiber anchor composed of the cage-like carbon fiber tape 61 and the adherends (repair reinforcement bodies) 1a and 1c are bonded with a resin to form the adhesive layer 8, and the adhesive layer 8 Is within the range of 0 to 3 mm, and the maximum thicknesses 8a and 8b are within the range of 0 to 6 mm. More preferably, the average thickness is in the range of 0.1 to 2.5 mm, the maximum thickness is in the range of 1 to 5 mm, and still more preferably, the average thickness is in the range of 0.5 to 2 mm, and the maximum thickness is 1.5 to 4 mm. Within range. When the average thickness exceeds 3 mm and the maximum thickness exceeds 6 mm, when a load (mainly shear load) is applied to the bonding structure, brittle cohesive failure of the resin occurs in the bonding layer 8 and excellent bonding strength, that is, repair and reinforcement. Highly effective. When the adhesive layer 8 is formed within the scope of the present invention, the fragile cohesive failure of the resin is suppressed, and mainly at the interface on the adherend (in some cases, the carbon fiber bundles 6a and 6a ′ in the carbon fiber anchors). Fracture occurs at the interface), and an excellent adhesive strength, that is, a repair and reinforcement effect is exhibited. It is not an adhesive structure with a smooth surface as in the conventional adhesive structure, but at least one of the complex structures in which the carbon fiber bundles 6a and 6a 'in the carbon fiber anchor are converged to form an island shape as in the present invention. The point of finding such a point in the adhesive structure is the greatest feature of the present invention.

  Here, the adhesive layer thickness was measured as follows. A cross section in a direction perpendicular to the carbon fiber bundles 6a and 6a ′ in the carbon fiber anchor is observed (for example, FIG. 5 and FIG. 6), and the lower limit of the carbon fiber bundle is exposed in the planar direction from the adherend ( For example, the distances from the lower end of 6a ′) to the upper ends 7b and 7d of the adherend at that location are all measured, and the average value and the maximum thickness are indicated. For example, in FIG. 5, the maximum thickness 8a is the distance from the lower end 7a of the carbon fiber bundle 6a 'to the upper end 7b of the adherend. In FIG. 6, the maximum thickness 8b is the distance from the lower end 7c of the carbon fiber bundle 6a 'to the upper end 7d of the adherend. The cross section to be measured was measured at two locations, 10 mm inside from both ends (fan and embedded) in the adhesive structure, and was represented by the average value and the maximum value. The average thickness and the maximum thickness of 0 mm mean that the carbon fiber bundles 6a and 6a ′ in the carbon fiber anchor are the adherends of the concrete structure 1a (or the carbon fiber sheet 1c bonded to the concrete structure with a resin). ). That is, even when the carbon fiber bundles 6a and 6a ′ are in contact with the adherend, the carbon fiber bundle is bonded to the adherend by the resin present on both sides or around the carbon fiber bundle in contact with the adherend. It is possible.

  Moreover, in FIG. 6, the carbon fiber anchor of this invention is comprised by the laminated body which laminated | stacked the saddle-like carbon fiber tapes 61 and 62 on two layers. As a lamination method, it may be folded or a plurality of layers of bowl-shaped carbon fiber tapes having substantially the same shape may be laminated in order. In the carbon fiber anchor composed of the laminated saddle-like carbon fiber tape, a part of the carbon fiber bundle 6a ′ of the saddle-like carbon fiber tape 61 of a specific layer enters the saddle-like carbon fiber tape 62 of the other layer. Is preferred. From the opposite viewpoint, it is preferable that a part of the carbon fiber bundle 6 b ′ of the saddle-like carbon fiber tape 62 of a specific layer enter the saddle-like carbon fiber tape 61 of the other layer.

  With such an embodiment, each cage carbon fiber tape can be reliably prevented from being broken due to peeling in the carbon fiber anchor constituted by the laminate, and can be structured to be surely broken by the adhesive layer. By forming this structure, there is an advantage that the adhesive strength in the adhesive structure can be reliably estimated. Here, the laminate may be obtained by folding and laminating a single bowl-like carbon fiber tape, or may be a laminate of a plurality of bowl-like carbon fiber tapes. In view of workability at the site, the former, which can improve work efficiency, is more preferable. On the other hand, when aiming at the expression of an excellent repair and reinforcement effect, the latter is preferable, and can be properly used depending on the purpose of using the carbon fiber anchor.

  In the embodiment shown in FIGS. 5 and 6, the flatness of the carbon fiber bundles 6 a, 6 a ′, 6 b, 6 b ′ in the carbon fiber anchor composed of the cage-like carbon fiber tapes 61, 62 is 0.5 or more and 2 It is preferable that the average major axis is 3 mm or less. When the carbon fiber bundle is in such an embodiment, the straightness of the vertical direction of the carbon fiber bundle can be improved, and high strength and elastic modulus can be expressed as a carbon fiber anchor aimed at local repair and reinforcement. Further, it is possible to realize excellent formability to the carbon fiber anchor, handleability as a tape, and flexibility (shape followability to the adherend). The flatness ratio can be calculated by a / b using the major axis a (mm) and the minor axis b (mm). FIG. 6 is a cross-sectional view schematically showing an aspect in which the carbon fiber sheet 1c is attached to a concrete column as a adherend (repair to be repaired) with a resin. In the carbon fiber sheet 1c, carbon fiber bundles are arranged in parallel in one direction, and are integrated with auxiliary fibers in a direction crossing the carbon fiber bundle. It is preferable that the flatness of the carbon fiber bundle 6c in the carbon fiber sheet 1c has a form of 2 or more and 20 or less, and the average thickness corresponding to the minor axis is 0.1 mm or more and 0.5 mm or less. When the carbon fiber bundle is in such a form, the flattened shape can not only reduce thickness unevenness in the adhesive layer, but also suppress fragile cohesive failure of the adhesive layer itself, and can minimize the generation of voids and voids. Can be expected. Furthermore, it is easy to follow the saddle-like carbon fiber tape, and not only can easily form an adhesive structure that exhibits high adhesive strength, but also concrete that has been affixed as a carbon fiber sheet that aims to repair and reinforce the overall planar shape. The repair and reinforcement efficiency of the structure can also be increased. As described above, in the present invention, the carbon fiber bundle in the carbon fiber anchor is converged in the above range to form an island shape, and the carbon fiber sheet as the adherend is flat in the above range. The point which discovered this point in the complicated adhesion structure can be said to be the greatest feature of the present invention.

  The cage-like carbon fiber tape used in the present invention will be described below. The saddle-like carbon fiber tape used in the present invention is a warp knitting tape composed of an auxiliary fiber ground knitting yarn and weft insertion yarn and a carbon fiber warp insertion yarn, and the ground knitting yarn forms a chain stitch structure. The carbon fiber bundle is inserted as a warp insertion thread that is inserted into the chain stitch structure in the warp direction, and the weft insertion thread is a synthetic fiber that is inserted in the lateral direction between adjacent chain stitch structures. It is preferable that the chain stitch structure is integrated to form a tape.

  More specifically, the saddle-like carbon fiber tape 40 of the present invention shown in FIG. 4 includes warp insertion yarns 2d, 2e, and 2f made of carbon fiber bundles arranged in the warp direction, and auxiliary fibers. The knitting yarns 3a, 3b, 3c and the weft insertion yarns 4d, 4e, 4f are made up of. In the cage-like carbon fiber tape 40, the carbon fiber bundles that are the warp insertion yarns 2d, 2e, and 2f are inserted into the chain stitch structure formed by the auxiliary fibers that are the ground knitting yarns 3a, 3b, and 3c. The auxiliary fibers as the weft insertion yarns 4d, 4e, and 4f integrate the chain stitch structure of the base knitting yarn in the tape width direction to form a warp knitting tape. In other words, the weft insertion yarns 4d, 4e and 4f have integrated the chain stitch structures of the ground knitting yarns 3a, 3b and 3c into which the carbon fiber bundles of the warp insertion yarns 2d, 2e and 2f are inserted. A knitted tape is formed. That is, in the warp knitting tape, the warp knitting yarns 2d, 2e, and 2f made of carbon fiber bundles are used as core yarns, and the auxiliary fibers that are the ground knitting yarns 3a, 3b, and 3c are arranged in the width direction of the carbon fiber bundle. The auxiliary fibers of the weft insertion yarns 4d, 4e, and 4f form a warp knitting structure that connects the base knitting yarns. Here, the warp knitting yarn, the ground knitting yarn, and the weft insertion yarn constituting the warp knitting tape can be textured by a series of knitting operations in the warp knitting machine.

  When the cage-like carbon fiber tape 40 of the present invention has the above-described configuration, the carbon fiber bundles 6a, 6a ′, 6b, 6b ′ in the carbon fiber anchors constituted by the cage-like carbon fiber tapes 61, 62 as described above. The aspect ratio is 0.5 or more and less than 2, and the long diameter can be easily controlled within a range of 3 mm or less.

  Although not shown in FIG. 4, in addition to the carbon fiber bundle of the warp insertion yarns 2d, 2e and 2f and the auxiliary fibers of the ground knitting yarns 3a, 3b and 3c and the weft insertion yarns 4d, 4e and 4f. Furthermore, it is preferable to use an awakening fiber having a melting point lower than that of the auxiliary fiber. The crushing fibers are aligned with the carbon fiber bundles of the warp insertion yarns 2d, 2e, and 2f, and are integrated with the carbon fiber bundles to form the auxiliary fibers that are the ground knitting yarns 3a, 3b, and 3c. It is preferable. Such squeezing fibers are melted at the time of producing the cage-like carbon fiber tape, and squeeze the warp woven structure (the chain stitch structure in FIG. 4). By adopting such an aspect, the awakening fiber further suppresses the warp knitting structure of the auxiliary fibers of the ground knitting yarns 3a, 3b, and 3c from being collapsed or unraveled when cutting the saddle-like carbon fiber tape 40. Can fulfill the function.

  In order to further increase the effect of the squeezing, the squeezing fiber does not align the squeezing fiber with the carbon fiber bundle. For example, S or Z single covering in the twisting process or S and Covering may be performed like double covering in the Z direction, and the fiber for crushing may be wound in advance around the carbon fiber bundle in a spiral shape, and then the auxiliary fiber and the warp knitted structure may be formed. In addition to or in place of covering the carbon fiber bundle, if the filling fiber is covered with the ground knitting yarn, the filling effect can be further enhanced.

  In the cage-like carbon fiber tape 40 of the present invention, the fineness of the auxiliary fibers is preferably thin, and it is preferable that the fineness of the carbon fiber bundle is 1/5 or less. More preferably, it is 1/10 or less, and more preferably 1/20 or less. There is no particular lower limit to the fineness of the auxiliary fiber, but if it is too thin, it becomes difficult to form a warp knitted structure. Therefore, the fineness is preferably 1/500 or more of the fineness of the carbon fiber bundle. The lower limit of the fineness of the auxiliary fiber is not particularly limited, but it is preferably 1/1000 or more in order to minimize the cause of stoppage such as yarn breakage during knitting. More preferably, it is 1/750 or more. From another viewpoint, the fineness of the auxiliary fiber is preferably 1.5 to 150 TEX, more preferably 3 to 100 TEX, and still more preferably 5 to 50 TEX. When a bundle having a fineness at least 5 times larger than that of the auxiliary fiber is used as the carbon fiber bundle, the auxiliary fiber is relatively bent in the warp knitted structure, and the carbon fiber bundle is crimped or bent. Thus, the characteristics that the carbon fiber bundle should originally express can be fully utilized. In addition, when the auxiliary fibers constituting the ground knitting yarn and the weft insertion yarn are those having a thin total fineness of 1/5 or less of the reinforcing fiber yarn, the intersection of the ground knitting yarn and the weft insertion yarn in the warp knitting structure is also thick. In other words, the mechanical properties can be minimized.

  In the present invention, from the viewpoint of enhancing the mechanical properties, that is, improving the straightness of the carbon fiber bundle, the saddle-like carbon fiber tape of the present invention includes the ground knitting yarns 3a, 3b, and 3c shown in FIG. The pitch La is preferably in the range of 1 to 2 mm, more preferably in the range of 1.1 to 17 mm. That is, the chain stitch structure is preferably in the range of 5 to 10 course / cm, more preferably in the range of 6 to 9 course / cm. Here, warp insertion yarn, ground knitting yarn and weft insertion yarn can be formed into a structure by a series of knitting operations in a warp knitting machine. Here, a loop is formed and the warp insertion yarn is focused. We are paying attention to the chain structure that plays a role. If it is less than 5 courses / cm, the straightness of the vertical direction in the tape plane of the carbon fiber bundle may not be improved. As a preferable measure of straightness, the center line of the carbon fiber bundle has an amplitude in the transverse direction with respect to the vertical direction within 5 mm, more preferably within 2 mm. When the carbon fiber anchor is the effect of the present invention within the above range, high strength and elastic modulus can be expressed. Such an effect is remarkably manifested when an auxiliary fiber that is 1/5 or less than the carbon fiber bundle is used. On the other hand, if it exceeds 10 courses / cm, the production speed may become extremely slow.

  The weft insertion yarns 4d, 4e, and 4f in FIG. 4 preferably have a frequency of reciprocating between adjacent chain stitch structures once every 2 to 10 courses. More preferably, once every 3 to 6 courses. Here, the frequency is expressed by the number of courses required for one reciprocation of the weft insertion yarn. The weft insertion yarn plays an important role in maintaining the shape of the cage-like carbon fiber tape, and means that the amount of the weft insertion yarn connecting between the chain stitch structures increases as the frequency decreases, It is preferable that it is the frequency within the said range from a viewpoint of the shape maintenance property of a cage-like carbon fiber tape, and a handleability. In addition, due to the mechanism of the warp knitting machine, at least two courses are required for the reciprocation of the weft insertion yarn, and less than that is practically impossible. On the other hand, when the frequency exceeds 10 courses, the stretchability in the tape width direction of the warp knitted tape is likely to be inferior, the form stability when cutting the saddle-like carbon fiber tape, and the handleability are poor. The parallelism cannot be maintained and the reinforcing effect may not be ensured.

  Furthermore, in the saddle-like carbon fiber tape 40, the carbon fiber bundles constituting the warp insertion yarn are arranged and arranged in a saddle shape at substantially the same interval, and the gap between the warp insertion yarns is 1.3 to 30 mm. It is preferable that Specifically, in the cage-like carbon fiber tape 40, even if the gaps between the warp insertion yarns (2d and 2e, 2e and 2f) shown in FIG. Formability to the carbon fiber anchor, shape retention as a tape, and handleability can be realized. From another viewpoint, the warp knitting structure is excellent in flexibility (shape followability to adherend). In such a cage-like carbon fiber tape, the gap between the carbon fiber bundles of the warp insertion yarn is preferably 1.3 to 30 mm, more preferably 2 to 20 mm, still more preferably 3 as described above. ~ 15 mm. When the spacing is less than 1.3 mm, not only the significance of the present invention that realizes excellent shape retention and handling properties tends to be weakened, but also when a carbon fiber yarn having a large total fineness is used, the resin It may be difficult to impregnate. On the other hand, if it exceeds 30 mm, the function of repairing and reinforcing the adherend may not be achieved as the cage-like carbon fiber tape 40.

  Further, in the cage-like carbon fiber tape 40 of the present invention, the ratio W1 / the ratio W1 / the standing width W1 when left with no external force in the tape width direction and the maximum tape width W0 when the external force is given in the tape width direction. It is preferable that W0 = 0.5 to 0.95. More preferably, it exists in the range of 0.7-0.9. When W1 / W0 is less than 0.5, the stretchability is too strong when repairing and reinforcing the adherend as a saddle-like carbon fiber tape, and the form retainability and the carbon fiber anchor after impregnating the resin Shaping may be difficult. On the other hand, if W1 / W0 exceeds 0.95, the stretchability is too weak, and it may be difficult to maintain the shape and shape the carbon fiber anchor after impregnating the resin. Within such a range, when the bowl-shaped carbon fiber tape is wound around the tubular body and handled as a scroll as described later, the width of the tubular body is longer than the width of the bowl-shaped carbon fiber tape. It becomes easy, and it can greatly contribute to the improvement of workability when forming an adhesive structure described later. When the cage-like carbon fiber tape is made into a scroll shape, a uniform cage-like carbon fiber tape can be obtained wherever it is cut out and used, especially when a large amount of cage-like carbon fiber tape is cut out from the scroll and used for repair and reinforcement. Easy to use.

  In the present invention, the carbon fibers used as the warp insertion yarn include polyacrylonitrile (PAN) -based carbon fibers, pitch-based carbon fibers, cellulose-based carbon fibers, and yarns formed by blending two or more of these. Is given as an example. In the case where the strength and elastic modulus of the composite material are further emphasized, it is preferable to use PAN-based carbon fibers among these.

  Moreover, since the effect of the present invention is particularly remarkable when a carbon fiber bundle having a large fineness is used as a multifilament, the number of filaments of the carbon fiber bundle is preferably 12,000 to 100,000. The number is preferably 24,000 to 50,000, and the total fineness is preferably 700 to 8,000 TEX, more preferably 1,500 to 4,000 TEX. Further, such a carbon fiber bundle having a large fineness can be produced not only with a high productivity but also at a low cost. In addition, what is usually called a graphite fiber is included in the carbon fiber said by this invention.

  In the present invention, the auxiliary fiber used as the ground knitting yarn and the weft insertion yarn preferably has a total fineness of 1/5 or less of the fineness of the carbon fiber bundle. As the auxiliary fiber, glass fiber, polyester fiber, polyamide Threads made of synthetic fibers such as fibers, aramid fibers, polyarylate fibers, polyvinyl alcohol fibers, polyethylene fibers, PBO fibers and polyurethane fibers are preferably used. With ground knitting yarns and weft insertion yarns composed of supplementary fibers, the ground knitting yarn used for warp knitting has a greater negative impact on productivity when yarn breaks during knitting, so the yarn during knitting surely From the viewpoint of suppressing breakage, it is preferable to use a yarn having a fineness greater than the weft insertion yarn.

  In particular, as the auxiliary fibers used for the ground knitting yarn, those which are less likely to generate fluff during weaving because of warp knitting are preferably used. Further, in order to bundle the carbon fibers so as to form a cocoon shape, auxiliary fibers having particularly high stretchability are preferably used. From such a viewpoint, it is preferable to use synthetic fibers as auxiliary fibers used for the ground knitting yarn, and more preferably, processed yarns of polyester fiber, polyamide fiber or polyurethane fiber are used. As the processed yarn capable of increasing the stretchability, a crimped yarn such as a woolen yarn is preferable. Among them, a polyester fiber crimped yarn that is particularly inexpensive and excellent in dimensional stability is preferable. Here, the crimping process refers to a process that becomes bulky by false twisting or the like, and refers to a process that imparts large stretchability in the longitudinal direction of the auxiliary fiber. The crimped yarn preferably has a crimp rate of 10 to 70%. On the other hand, in terms of knitting, if raw silk (especially multifilament yarn) is used to improve sliding with a ridge or a guide, the knitting performance can be improved. Polyester fiber raw silk or polyamide fiber raw silk is particularly preferable. Used. The number of filaments is not particularly limited, but is preferably 10 to 1,000, more preferably 30 to 400. On the other hand, the auxiliary fiber used for the weft insertion yarn is not as severely scratched as the ground knitting yarn, but dimensional stability is extremely important. If the dimensions of the weft yarn change, the number of reinforcing fiber bundles per unit area (corresponding to the basis weight of the reinforcing fiber yarn) will fluctuate, making it difficult to design the composite material so as to obtain the desired repair and reinforcement effect. There is a case. From this point of view, it is preferable to use raw fibers (particularly multifilament yarns) that are not processed with glass fibers or synthetic fibers as auxiliary fiber yarns used in the weft direction yarns, and glass fiber yarns are particularly preferably used. . On the other hand, in terms of handleability, use of crimped yarn (especially Woolened yarn) can improve handleability and formability, and polyester fiber processed yarn or polyamide fiber processed yarn is preferably used. In addition, although there is no restriction | limiting in particular as a filament number, It is preferable that it is 10-1,000, More preferably, it is 30-400.

  It is preferable that the awakening fiber used in the present invention is melted at a temperature at which the auxiliary fiber does not melt. For example, when a polyester fiber is used as the auxiliary fiber, a fiber having a melting point lower than 255 ° C. of the polyester fiber is preferable, and specifically, a low-melting copolymer polyester fiber having a melting point of 80 to 200 ° C. Polymerized polyamide fibers and polyolefin fibers are preferably used. From another viewpoint, when glass fiber is used as the auxiliary fiber, normal polyester fiber having a melting point of 255 ° C. can be used as the awakening fiber.

  The formation method of the adhesion structure of the carbon fiber anchor of the present invention goes through the following steps (A), (B), (C) and (D). Each step will be described below.

(A) Cutting process The said saddle-like carbon fiber tape wound around the tubular body is unwound, and it cuts by predetermined length. When the cage-like carbon fiber tape is wound around a tubular body and can be handled as a scroll, it can greatly contribute to the improvement of workability even when an adhesive structure is formed. When the cage-like carbon fiber tape is made into a scroll shape, a uniform cage-like carbon fiber tape can be obtained wherever it is cut out and used, especially when a large amount of cage-like carbon fiber tape is cut out from the scroll and used for repair and reinforcement. Easy to use. In addition, it is preferable that the width of the tubular body is longer than the width of the bowl-shaped carbon fiber tape because the workability is further improved.

(B) Impregnation step A cut carbon fiber tape is impregnated with a resin in advance. It is preferable that the weight of the resin with respect to the weight of the cage-like carbon fiber tape to be used is within a range of 1 to 1.8 times that of the cage-like carbon fiber tape through this step and the shaping step (C) described later. If it is less than 1 time, the absolute amount of the resin to be impregnated is insufficient, and the carbon fiber bundle may not be sufficiently impregnated with the resin, and the effect of repair and reinforcement may be reduced. On the other hand, if it exceeds 1.8 times, the thickness of the resin layer exceeds 3 mm on average and exceeds 6 mm on the maximum, resulting in adhesive strength not being exhibited or variations in adhesive strength. May not be able to solve the problem. By forming the carbon fiber anchor with such a resin amount, an adhesive layer described later can be easily controlled within an average thickness of 0 to 3 mm and a maximum thickness of 0 to 6 mm.

(C) Shaping process Shaped carbon fiber tape impregnated with resin in advance in the shape of a fan on a concrete structure that is an adherend or a concrete structure with a carbon fiber sheet affixed with resin. A carbon fiber anchor is formed which forms the fan part and the embedded part concentrated in a rod shape.

  In this step, when forming the carbon fiber anchor using the saddle-like carbon fiber tape as a laminate, the saddle-like carbon fiber tape is laminated on the adherend one by one, and a part of the carbon fiber bundle of the specific layer is formed. It is preferable to form the carbon fiber anchor so as to enter each of the other layers. Here, the laminate may be obtained by folding and laminating a single bowl-like carbon fiber tape, or may be a laminate of a plurality of bowl-like carbon fiber tapes. In view of workability at the site, the former, which can improve work efficiency, is more preferable. On the other hand, when aiming at the expression of an excellent repair and reinforcement effect, the latter is preferable, and can be properly used depending on the purpose of using the carbon fiber anchor.

  In this step, when forming a carbon fiber anchor using the saddle-like carbon fiber tape as a laminate, it is preferable to form a carbon fiber anchor by re-applying a resin for each layer of the saddle-like carbon fiber tape. By forming the carbon fiber anchor by such a procedure, an adhesive layer described later can be easily controlled within an average thickness of 0 to 3 mm and a maximum thickness of 0 to 6 mm. More preferably, the average thickness is in the range of 0.1 to 2.5 mm, the maximum thickness is in the range of 1 to 5 mm, and still more preferably, the average thickness is in the range of 0.5 to 2 mm, and the maximum thickness is 1.5 to 4 mm. Within range.

  Further, in this step, it is preferable that the carbon fiber anchors are formed by adjusting the number of carbon fiber bundles within a predetermined adherend by expanding and contracting the cage-like carbon fiber tape in the tape width direction. By using the above-mentioned saddle-like carbon fiber tape, it can be easily expanded and contracted in the tape width direction. Therefore, when repairing and reinforcing the adherend as a saddle-like carbon fiber tape, it is impregnated with form retainability and resin. The subsequent shaping to the carbon fiber anchor can be facilitated.

  In the carbon fiber anchor formed by cutting and shaping the cage-like carbon fiber tape into a predetermined length, the ratio of the fan portion and the embedded portion within the predetermined length is determined by the covering. It can be appropriately selected depending on the structure of the kimono. From the viewpoint of balancing the adhesive strength, it is preferable to distribute the predetermined length between the fan portion and the embedded portion at a ratio that balances the adhesive strength at the fan portion and the drawing strength at the embedded portion. . From the viewpoint of increasing the adhesive strength, it is effective to widen the width of the fan tip or fan root, particularly the fan root at the fan portion as much as possible. In the present invention, the width of the fan root is 2 to 5 cm. The aspect which makes it in the range of is preferable, More preferably, it exists in the range of 3-4 cm.

(D) Adhesion process An adhesion layer is formed between the carbon fiber anchor and the adherend, and the average thickness of the adhesion layer is in the range of 0 to 3 mm, and the maximum thickness is in the range of 0 to 6 mm. When the average thickness exceeds 3 mm and the maximum thickness exceeds 6 mm, when a load (mainly shear load) is applied to the adhesive structure, cohesive failure of the resin occurs in the adhesive layer, and the excellent adhesive strength, that is, the repair and reinforcement effect is high. Not expressed. If the adhesive layer is formed within the scope of the present invention, the cohesive failure of the resin is suppressed, and the failure mainly occurs at the interface of the adherend (in some cases, the interface of the carbon fiber bundle in the carbon fiber anchor). Thus, excellent adhesive strength, that is, a repair and reinforcement effect is exhibited at a high level.

Hereinafter, the present invention will be described more specifically with reference to examples. In the examples of the present invention, the following materials were used.
Carbon fiber bundle: PAN-based carbon fiber bundle (“Torayca” manufactured by Toray Industries, Inc., tensile strength 4,900 MPa, tensile elastic modulus 230 GPa, number of filaments 24,000, total fineness 1,650 TEX)
Auxiliary fiber yarn: Crimped yarn of polyester fiber ("Tetron" manufactured by Toray Industries, Inc., 10 filaments, fineness 3.3TEX, melting point 255 ° C, woolen yarn)
Awakening fiber: Copolyamide fiber (“Elder” manufactured by Toray Industries, Inc., fineness 3.3 TEX, melting point 110 ° C.)
Room temperature curing type epoxy resin: “TS Resin SRCF” manufactured by Toray Industries, Inc.

Example 1
As a warp insertion thread, a carbon fiber bundle (38 fibers) was prepared, in which the above-mentioned fibers for alignment were aligned with the carbon fiber bundle. While forming a chain knitting structure using the above auxiliary fibers (arrangement density of 1.9 / cm) as a ground knitting yarn, each of the chain knitting structures is awakened with one carbon fiber bundle (arrangement density of 1.9 / cm cm) and the above auxiliary fibers (arrangement density 1.9 / cm) as the weft insertion thread, the chain stitch structure is 7 courses / cm as shown in FIG. 4, and the weft insertion thread is the adjacent chain. A warp knitting structure was formed at a frequency of one reciprocation between three knitting structures and knitted. After knitting and before winding on the knitting machine, it was heated to a temperature of 150 ° C., and only the fiber for crushing was melted and clogged.

  The obtained cocoon-like carbon fiber tape constitutes a warp woven structure in which one carbon fiber bundle and one auxiliary fiber 2 of the ground knitting yarn are integrated with auxiliary fibers of the weft insertion yarn. The gap between the carbon fiber bundles was 3 mm, which was excellent not only in form retention and handling properties but also in flexibility. In addition, the chain stitch structure is struck by the squeezing fiber, which suppresses the breakage of the structure at the time of handling and the unraveling at the time of cutting.

FIG. 7 is a schematic plan view showing one embodiment of the joint test piece 70 in the embodiment of the present invention.
A carbon fiber sheet 9b ("Torayca" cross UT70-30 manufactured by Toray Industries, Inc.) is cut into a width of 10 cm and a length of 40 cm on a steel sheet 9a having a width of 10 cm and a length of 60 cm, and the longitudinal direction is set as the orientation direction of the carbon fiber bundle. Then, two sheets were attached by hand lay-up using the normal temperature curing type epoxy resin based on one end of the steel plate 9a.

  Next, the cage-like carbon fiber tape wound around a tubular body is unwound and cut into a stationary width of 21 cm (maximum width when an external force is applied) × 40 cm in length. It was impregnated in advance using the same epoxy resin as the fiber tape. A carbon fiber sheet 9b (resin cured for 1 day) affixed to the steel plate 9a is used as an adherend, and a saddle-like carbon fiber tape impregnated with resin in advance is folded in the width direction to form a two-layer laminate (width 10 cm). A fan part 72 shaped into a fan shape having a width of 10 cm and a length of 20 cm and an embedding part 73 converged in a rod shape having a width of 3 cm and a length of 20 cm were formed. In that case, the fan part 72 was formed so that the embedding part 73 might be arrange | positioned on the same edge part side as the carbon fiber sheet affixed on the basis of one edge part of a steel plate, and the carbon fiber anchor 71 was formed. The weight of the resin used was 1.5 times that of the cage-like carbon fiber tape, and the laminate-like cage-like carbon fiber tape was re-coated with the resin for each layer to form a carbon fiber anchor.

  When forming a carbon fiber anchor, the cage-like carbon fiber tape is bundled so that the carbon fiber bundle is a cage-like shape with auxiliary fibers having a large stretchability, and particularly when the tape width direction is bent (for example, lamination) ) And the shapeability when expanding and contracting, and the carbon fiber bundle can be neatly oriented and its straightness is also very good (the center line of the carbon fiber yarn is perpendicular to the vertical direction) The amplitude in the horizontal direction is within 2 mm). Therefore, as a result, a carbon fiber anchor excellent in quality was obtained.

  The resin was cured for 13 days, and the adhesive layer thickness of the obtained adhesive structure was measured. The average thickness was 1.6 mm, and the maximum thickness was 3.5 mm. Moreover, the laminated saddle-like carbon fiber tape had an embodiment as shown in FIG. 6 in which the respective carbon fiber bundles entered the other layers. Furthermore, the flatness of the carbon fiber bundle in the carbon fiber anchor 71 was 1.2, and the average major axis was 2.2 mm. On the other hand, the flatness of the carbon fiber bundle in the bonded carbon fiber sheet 9b was 4, and the average thickness corresponding to the minor axis was 0.3 mm.

  Using this test piece 70, five joint tests (tensile on the other end of the steel plate 9a and the carbon fiber anchor embedded portion and applying shear to the adhesive layer) were conducted, and as a result, the breaking load was averaged. The expression of 125 kN, standard deviation 7.9 kN, extremely high adhesive strength and low standard deviation (high stability) could be confirmed.

(Example 2)
A cage-like carbon fiber tape was obtained in the same manner as in Example 1 except that the fiber for squeezing in Example 1 was not used and it was not heated to a temperature of 150 ° C. after knitting but before winding of the knitting machine. . Since the obtained cage-like carbon fiber tape was not agitated, it was not as good as that of Example 1 in suppressing tissue breakage during handling and cracking during cutting, but it was at a level that could withstand use. Moreover, since there was no awakening, it was more flexible than that of Example 1.

  Further, in Example 1, the carbon fiber anchor 71 was formed by folding the bowl-shaped carbon fiber tape to form a two-layer laminate. In Example 2, the bowl-shaped carbon fiber tape was not laminated, but the bowl-shaped carbon fiber tape was not laminated. Taking advantage of the stretchability in the width direction, a one-layer carbon fiber anchor was formed by shrinking to a width of 10 cm in the width direction. As in Example 1, the shapeability when stretched was very excellent, the carbon fiber bundle could be neatly oriented, and its straightness was also very good (the center line of the carbon fiber yarn was The amplitude in the horizontal direction with respect to the direction is within 2 mm). Therefore, as a result, a carbon fiber anchor excellent in quality was obtained.

  When the adhesive layer thickness of the obtained adhesive structure was measured, the average thickness was 1.9 mm, and the maximum thickness was 4 mm. The flatness of the carbon fiber bundle in the carbon fiber anchor 71 was 1.2, and the average major axis was 2.1 mm.

(Reference Examples 1-7)
In the same manner as in Example 2, the chain knitting structure was formed at 4, 5, 6, 7, 8, 9, 10 course / cm and knitted to obtain 7 types of saddle-like carbon fiber tapes (in order of reference example) 1-7). Each of these seven types was impregnated with one of the above room temperature curing type epoxy resins by hand lay-up, shaped into a rectangular shape with a width of 10 cm and a length of 20 cm, and the resin was cured for 13 days. A carbon fiber tape tensile test specimen was molded. Using this, the elastic modulus was measured in accordance with JIS-A1191-2004 (tensile test method for continuous fiber sheet for concrete reinforcement), and the results were 158, 251, 257, 260, 253, 257, and 251 GPa in order. That is, it was confirmed that an extremely high elastic modulus, that is, excellent straightness of the carbon fiber bundle, was obtained within the range of 5 to 10 course / cm, more preferably 6 to 9 course / cm.
In addition, when the warp knitting structure was knitted at 11 courses / cm, there was a problem that the production speed was extremely slow, so that it was not used for measuring the elastic modulus.

(Comparative Example 1)
A cage-like carbon fiber tape was obtained in the same manner as in Example 2 except that the chain stitch structure in Example 2 was formed at 3 courses / cm and knitted. The obtained cage-like carbon fiber tape has a coarse warp knitting structure and loose carbon fiber bundle restraint, so that the flexibility is too large and the stiffness is insufficient compared to Example 2, and the form retainability and handleability are improved. Not only was it inferior, but the straightness of the carbon fiber bundle was also inferior.

  Further, a carbon fiber anchor was formed in the same manner as in Example 2, but the straightness of the carbon fiber bundle was inferior (the center line of the carbon fiber yarn had an amplitude of 3 mm or more in the transverse direction with respect to the warp direction), As a result, only carbon fiber anchors with poor quality were obtained.

  When the adhesive layer thickness of the obtained adhesive structure was measured, the average thickness was 3.5 mm, and the maximum thickness was 5.7 mm. The flatness of the carbon fiber bundle in the carbon fiber anchor 71 was 2.1, and the average major axis was 3.3 mm.

  Further, five joint tests were conducted using the test pieces obtained in the same manner as in Example 1. As a result, the breaking load averaged 70 kN, standard deviation 17.3 kN, extremely low adhesive strength and high standard deviation (low stability) It was confirmed that the properties were significantly inferior to those of Example 1.

(Comparative Example 2)
A carbon fiber tape (plain fabric) was obtained in a plain weave structure with the same arrangement pitch as in Examples 1 and 2, using the carbon fiber bundle as the warp and the auxiliary fiber as the weft. The obtained plain woven fabric could not be bundled because the carbon fiber bundles could not be converged, the carbon fiber bundles were misaligned, the structure was easily broken, and the shape retention and handling properties were inferior.

  Next, an attempt was made to form a carbon fiber anchor in the same manner as in Example 1 using the above-described carbon fiber plain fabric, but when the resin was impregnated by hand layup, the carbon fiber tape was not wrinkled. Therefore, the arrangement of the carbon fiber bundles is likely to be disturbed, and not only the handling property and the shapeability are significantly inferior to those of Example 1 and Example 2, but also the carbon fiber yarns cannot be neatly aligned and the straightness thereof is improved. Also greatly inferior. For this reason, the quality of the carbon fiber anchor obtained as a result was inferior, and a beautiful fan-shaped part or embedded part could not be formed.

  According to the adhesion structure of the carbon fiber anchor of the present invention, an excellent repair and reinforcement effect such as particularly high adhesive strength can be exhibited. In addition, by using the cage-like carbon fiber tape, a composite material having excellent woven fabric flexibility, handleability and shapeability (particularly shapeability in the width direction of the cage-like carbon fiber tape) and excellent mechanical properties can be obtained. Therefore, it is particularly suitable as a repair reinforcing material that adheres to the surface, such as repair and reinforcement of a concrete structure or a building, and is useful as a repair reinforcing material in the field of civil engineering and construction, particularly in the construction field.

It is a schematic perspective view of the adhesion structure which repaired and reinforced the adherend according to one embodiment of the present invention. It is a schematic plan view of the carbon fiber anchor which concerns on one embodiment of this invention. It is a schematic plan view of the carbon fiber anchor which concerns on another embodiment of this invention. It is a schematic plan view which shows one embodiment of the cage-like carbon fiber tape used in this invention. It is a schematic sectional drawing of the adhesion structure of the carbon fiber anchor concerning one embodiment of the present invention. It is a schematic sectional drawing of the adhesion structure of the carbon fiber anchor which concerns on another embodiment of this invention. It is a schematic plan view which shows the joint test piece in the Example of this invention.

Explanation of symbols

1a Pillar (concrete structure)
1b Wall (concrete structure)
1c, 9b Carbon fiber sheets 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, warp insertion yarn (carbon fiber bundle)
3a, 3b, 3c Ground knitting yarn (auxiliary fiber)
4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i Weft insertion thread (auxiliary fiber)
5a, 5b Resins 6a, 6b Carbon fiber bundles 6a 'and 6b' in carbon fiber anchors Among carbon fiber bundles in carbon fiber anchors, carbon fiber bundles 6c related to the measurement of the adhesive layer thickness were pasted with resin. Carbon fiber bundles 7a, 7c in carbon fiber sheet Lower end 7b, 7d of carbon fiber anchor Upper end 8 of adherend Adhesive layer 8a, 8b Maximum thickness of adhesive layer 9a Steel plate 10, 50, 60 Adhesive structure 20, 30, 71 Carbon Fiber anchor 21, 23, 31, 72 Fan section 22, 32, 73 Embedded section 40, 61, 62 Saddle-like carbon fiber tape 70 Joint test piece La Pitch of ground knitting yarn of bowl-like carbon fiber tape

Claims (12)

  It is an adhesive structure in which a carbon fiber anchor is bonded to a concrete structure that is an adherend or a carbon fiber sheet attached to a concrete structure, and the carbon fiber anchor has a carbon fiber bundle aligned in one direction. The carbon fiber anchor and the adherend are formed by impregnating a cage-like carbon fiber tape arranged with a resin with a resin to form a fan-shaped fan part and a bar-shaped embedded part. Are bonded by the resin to form an adhesive layer, and the carbon fiber anchor is characterized in that the average thickness of the adhesive layer is in the range of 0 to 3 mm and the maximum thickness is in the range of 0 to 6 mm. Adhesive structure.   2. The carbon fiber according to claim 1, wherein the carbon fiber anchor is composed of a laminate of cage-like carbon fiber tapes, and in the bonded carbon fiber anchor, a part of a carbon fiber bundle of a specific layer enters another layer. Anchor adhesion structure.   The saddle-like carbon fiber tape is a warp knitting tape composed of an auxiliary fiber ground knitting yarn and a weft insertion yarn, and a carbon fiber warp insertion yarn, wherein the ground knitting yarn forms a chain stitch structure, A carbon fiber bundle is inserted as a warp insertion thread inserted into the chain stitch structure in the warp direction, and the weft insertion thread is a synthetic fiber inserted in the lateral direction between adjacent chain stitch structures. The carbon fiber anchor bonding structure according to claim 1 or 2, wherein the warp knitted tape is formed by integrating a tissue.   The carbon fiber sheet having a form in which the flatness of the carbon fiber bundle in the bonded carbon fiber anchor is 0.5 or more and less than 2, the average major axis is 3 mm or less, and is attached to a concrete structure However, the carbon fiber bundles are arranged in parallel in one direction and integrated with auxiliary fibers in a direction crossing the carbon fiber bundle, and the flatness of the carbon fiber bundle in the bonded carbon fiber sheet is 2 The carbon fiber anchor bonding structure according to any one of claims 1 to 3, wherein the carbon fiber anchor has a form of 20 or less and an average thickness corresponding to the minor axis is 0.1 mm or more and 0.5 mm or less.   The crimped carbon fiber tape has a chain stitch structure of 5 to 10 course / cm, and the ground knitting yarn and the weft insertion yarn are crimped yarns of synthetic fibers. Bonding structure of carbon fiber anchor as described in 1.   The ratio W1 / W0 = 0.5 between the standing width W1 when the saddle-like carbon fiber tape is left with no external force in the tape width direction and the maximum tape width W0 when the external force is given in the tape width direction. The adhesion structure of the carbon fiber anchor in any one of Claims 1-5 which is -0.95.   In the saddle-like carbon fiber tape, the fiber for closing whose melting point is lower than that of the auxiliary fiber is aligned with the warp insertion yarn, or is covered with the warp insertion yarn or the ground knitting yarn. The adhesion structure of the carbon fiber anchor in any one of Claims 1-6 in which the fiber for dough fuse | melts and the chain-knitting structure is awakened. When forming the adhesion structure of the carbon fiber anchor according to any one of claims 1 to 7, carbon is characterized by undergoing the following steps (A), (B), (C) and (D). A method for forming an adhesive structure of a fiber anchor.
(A) A cutting step of unwinding the cage-like carbon fiber tape wound around the tubular body and cutting it at a predetermined length (B) An impregnation step of impregnating the cut cage-like carbon fiber tape with a resin in advance (C) resin Embedding a fan-shaped carbon fiber tape impregnated with a fan on a concrete structure that is an adherend or a carbon fiber sheet affixed to a concrete structure and fan-shaped fan parts and rods Forming step (D) forming a carbon fiber anchor having a shape having a portion, forming an adhesive layer of the resin between the carbon fiber anchor and the adherend, and an average thickness of the adhesive layer of 0 to 3 mm Adhesion process to make the maximum thickness within the range of 0-6mm within the range   In the shaping step (C), when forming the carbon fiber anchor by laminating the saddle-like carbon fiber tape, the saddle-like carbon fiber tape is laminated on the adherend one by one to form a specific layer of carbon fiber. The method for forming an adhesive structure of a carbon fiber anchor according to claim 8, wherein the carbon fiber anchor is formed so that a part of the bundle enters another layer.   In forming the carbon fiber anchor by laminating the cage carbon fiber tape in the shaping step (C), the resin is re-applied to each of the layers of the cage carbon fiber tape to form the carbon fiber anchor. The formation method of the adhesion structure of the carbon fiber anchor of Claim 8 or 9 formed.   Through the said impregnation process (B) and the said shaping process (C), the weight of the resin with respect to the weight of the cage carbon fiber tape to be used exists in the range of 1 to 1.8 times of the cage carbon fiber tape. The formation method of the adhesion structure of the carbon fiber anchor in any one of 8-10.   In the shaping step (C), carbon fiber anchors are formed by adjusting the number of carbon fiber bundles so that the cage-like carbon fiber tape expands and contracts in the tape width direction and falls within a predetermined size range of the adherend. The formation method of the adhesion structure of the carbon fiber anchor in any one of Claims 8-11.

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