JP2019073672A - Fiber reinforced plastic filament with damage detection function - Google Patents

Fiber reinforced plastic filament with damage detection function Download PDF

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JP2019073672A
JP2019073672A JP2017202811A JP2017202811A JP2019073672A JP 2019073672 A JP2019073672 A JP 2019073672A JP 2017202811 A JP2017202811 A JP 2017202811A JP 2017202811 A JP2017202811 A JP 2017202811A JP 2019073672 A JP2019073672 A JP 2019073672A
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paint
carbon fiber
reinforced plastic
fiber cable
resin
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JP6969973B2 (en
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正治 小出
Shoji Koide
正治 小出
大輔 眞鍋
Daisuke Manabe
大輔 眞鍋
宜正 木村
Yoshimasa Kimura
宜正 木村
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Tokyo Seiko Co Ltd
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Tokyo Seiko Co Ltd
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Abstract

To enable finding damages of a fiber reinforced plastic filament at a construction site or a storage site without need for specific devices.SOLUTION: A carbon fiber cable 1 with damage detection function is constituted by bundling a plurality of fiber toes (fiber strands) 2 to which a thermosetting resin or a thermoplastic resin is impregnated, and is continuously covered by a coating 6 having a trough 2A formed between a neighboring fiber toes 2 with a breaking elongation of 0.5 to 10%, in a longer direction. When an external force over the breaking elongation of the coating 6 (side pressure or surface shear force) (especially strong flexure or impact) is added, the coating 6 is cracked (crack is generated).SELECTED DRAWING: Figure 4

Description

この発明は,繊維強化プラスチック線状体,特に損傷検知機能付の繊維強化プラスチック線状体に関する。   The present invention relates to a fiber-reinforced plastic linear body, particularly to a fiber-reinforced plastic linear body with a damage detection function.

長手方向に連続する繊維および上記繊維に含侵された樹脂(プラスチック)の複合材によって構成されるFRP(Fiber Reinforced Plastics )(繊維強化プラスチック)を用いて作製されたケーブル(ロープ,ロッド)は,鋼材を用いて作成されたものに比べて軽量で,高耐食性,非磁性などの優れた特性を持つ。炭素繊維,ガラス繊維,ボロン繊維,アラミド繊維,ポリエチレン繊維,PBO(polyp-phenylenebenzobisoxazole)繊維,その他の繊維(合成繊維)がFRPに使用する繊維の素材として,エポキシ樹脂,ポリアミド樹脂,フェノール樹脂その他の樹脂がFRPに使用する樹脂の素材として,それぞれ用いられる。FRPケーブルは,たとえばプレストレストコンクリートの緊張材といった土木用途,電線(送電線),光ファイバーケーブル,海底ケーブル等の補強材用途に適している。   A cable (rope, rod) manufactured using FRP (Fiber Reinforced Plastics) (fiber reinforced plastic) composed of a composite material of longitudinally continuous fibers and a resin (plastic) impregnated with the fibers, It is lighter in weight than those made using steel, and has excellent properties such as high corrosion resistance and non-magnetism. Carbon fiber, glass fiber, boron fiber, aramid fiber, polyethylene fiber, PBO (polyp-phenylenebenzobis oxazole) fiber, and other fibers (synthetic fibers) are materials of fibers used for FRP: epoxy resin, polyamide resin, phenol resin, etc. Resin is used as a material of resin used for FRP. FRP cables are suitable, for example, for civil engineering applications such as prestressed concrete tendons, and reinforcement applications such as electric wires (transmission lines), optical fiber cables, and submarine cables.

一般にFRPケーブルは長手方向の高い引張強度に対してこれに直交する強度はさほど高くはない。たとえば外力(側圧,面せん断力)が加わると,局所的な損傷(たとえば繊維の断線)が生じ,FRPケーブルの引張強度が低下することがある。   In general, the strength perpendicular to the high tensile strength in the longitudinal direction of the FRP cable is not so high. For example, when an external force (side pressure, surface shear force) is applied, local damage (for example, breakage of fibers) may occur and the tensile strength of the FRP cable may be reduced.

特許文献1は音波(超音波)を利用したFRPの損傷評価装置を記載する。FRP試験片に損傷があると試験片を通る音波(超音波)の特に低周波帯域の振幅が変化することを利用して試験片の損傷の有無が評価される。しかしながら,特許文献1に記載の損傷評価装置は試験片に引張負荷を加えたり除いたりすることを繰り返しながら検査を行うので,施工現場や保管現場におけるFRPケーブルの損傷評価には向いていない。また,試験片の長さ(超音波発信源から超音波受信センサまでの距離)がかなり短いので,長尺のFRPケーブルの全長の損傷評価を一度に行うこともできない。   Patent Document 1 describes an FRP damage evaluation apparatus using sound waves (ultrasound). If the FRP test piece is damaged, the change in the amplitude of the low frequency band of the sound wave (ultrasound) passing through the test piece is used to evaluate the presence or absence of the damage of the test piece. However, the damage evaluation device described in Patent Document 1 is not suitable for damage evaluation of FRP cables at a construction site or a storage site because the inspection is performed while repeatedly applying and removing a tensile load to and from a test piece. In addition, since the length of the test piece (the distance from the ultrasonic wave source to the ultrasonic wave receiving sensor) is quite short, damage evaluation of the entire length of the long FRP cable can not be performed at one time.

特許第6165908号公報Patent No. 6165908 gazette

この発明は,特別な装置を必要とすることなく,施工現場や保管現場において繊維強化プラスチック線状体の損傷を見つけることができるようにすることを目的とする。   An object of the present invention is to make it possible to find damage to a fiber-reinforced plastic linear body at a construction site or a storage site without requiring a special device.

この発明はまた,繊維強化プラスチック線状体の引張強度が低下しているまたはその可能性のあることを,外観上分かりやすく示すことを目的とする。   Another object of the present invention is to show that the tensile strength of the fiber-reinforced plastic linear body is lowered or possible, in an easily understandable manner in appearance.

第1の発明による損傷検知機能付繊維強化プラスチック線状体は,樹脂が含侵された複数の繊維トウ(繊維ストランド)を束ねることによって構成されるものであって,隣接する繊維トウ間に形成される谷部が 0.5〜10%の破断伸びを持つ塗料によって長手方向に連続して覆われていることを特徴とする。   The fiber-reinforced plastic linear body with a damage detection function according to the first invention is constituted by bundling a plurality of resin-impregnated fiber tows (fiber strands), and is formed between adjacent fiber tows It is characterized in that the valley portion to be covered is continuously covered in the longitudinal direction with a paint having an elongation at break of 0.5 to 10%.

損傷検知機能付の繊維強化プラスチック線状体は,樹脂(熱硬化性樹脂または熱可塑性樹脂)が含侵された複数の繊維トウを撚り合わせて束ねた撚り線タイプであってもよいし,樹脂が含侵された複数の繊維トウを編んだ組紐タイプであってもよい。樹脂が含侵された複数の繊維トウを撚り合わせることなく束ねた平行線タイプであってもよい。いずれにしてもこの発明による損傷検知機能付の繊維強化プラスチック線状体は,隣接する繊維トウ間に形成される谷部をその表面に有している。   The fiber reinforced plastic linear body with damage detection function may be a stranded wire type in which a plurality of fiber tows impregnated with resin (thermosetting resin or thermoplastic resin) are twisted and bundled, or resin It may be a braid type in which a plurality of impregnated fiber tows are woven. It may be a parallel line type in which a plurality of resin-impregnated fiber tows are bundled without being twisted together. In any case, the fiber reinforced plastic linear body with a damage detection function according to the present invention has valleys formed between adjacent fiber tows on its surface.

線条体は複数の繊維トウを束ねたものであるので,隣接する繊維トウ間に形成される谷部が線条体の長手方向にのび,この長手方向にのびる谷部が塗料によって連続して覆われている。塗料によって谷部を完全に埋めてもよいし,谷部の高さの途中までを塗料によって埋めてもよい。さらに谷部の底に空洞があってもよい(谷部を塗料膜によって覆う態様)。いずれにしても隣接する繊維トウ間に形成される谷部が,塗料によって長手方向に連続して覆われている。   Since the filament is a bundle of a plurality of fiber tows, the valleys formed between adjacent fiber tows extend in the longitudinal direction of the filament and the valleys extending in the longitudinal direction are continuously formed by the paint. It is covered. The valley may be completely filled with paint, or the middle of the height of the valley may be filled with paint. Furthermore, there may be a cavity at the bottom of the valley (an embodiment in which the valley is covered with a paint film). In any case, the valleys formed between adjacent fiber tows are continuously covered with paint in the longitudinal direction.

第1の発明によると,隣接する繊維トウ間に形成される谷部が 0.5〜10%の破断伸びを持つ塗料によって覆われているので,上記塗料の破断伸びを超える伸びを塗料に生じさせる外力(側圧や面せん断力)(典型的には強い曲げや衝撃)が線条体に加わると,塗料がひび割れる(クラックが発生する)。すなわち,隣接する繊維トウ間の谷部を覆っている塗料にひび割れが発生していることが確認されれば,その線条体は損傷を受けたものであることが分かる。引張強度の低下したまたはその可能性がある線条体を誤って使用してしまうことを未然に防ぐことができる。   According to the first aspect of the invention, since the valleys formed between adjacent fiber tows are covered with the paint having a breaking elongation of 0.5 to 10%, the external force causing the paint to have an elongation exceeding the breaking elongation of the paint. The paint cracks (cracks occur) when (lateral pressure or surface shear) (typically strong bending or impact) is applied to the wire. That is, if it is confirmed that the paint covering the valley between adjacent fiber tows is cracked, it can be understood that the striatum is damaged. It is possible to prevent in advance the misuse of the striated body having a reduced tensile strength or its possibility.

0.5%程度の破断伸びを塗料が持てば,たとえばリールやドラムに巻き回すために線条体が緩やかに曲げられても,それによって谷部を覆う塗料にひび割れは発生しない。10%程度の破断伸びを塗料が持てば,引張強度が低下する程度の外力が線条体に加わったときに塗料にひび割れを生じさせることができる。谷部を覆う塗料に発生するひび割れを,線条体に損傷(引張強度の低下)がある事実またはその可能性を示す目印とすることができる。    If the paint has a breaking elongation of about 0.5%, for example, even if the wire is bent gently for winding on a reel or a drum, no crack is generated in the paint covering the valley. If the paint has a breaking elongation of about 10%, the paint can be cracked when an external force that reduces the tensile strength is applied to the wire. The cracks that occur in the paint covering the valleys can be a mark that indicates the fact that the striatum is damaged (decreased tensile strength) or the possibility of it.

塗料は,隣接する繊維トウ間の谷部に設けられれば十分であるが,束ねられた複数の繊維トウの外周面全体を上記塗料によって覆うようにしてもよい。   The paint is sufficient if provided in the valleys between adjacent fiber tows, but the entire outer peripheral surface of a plurality of bundled fiber tows may be covered with the paint.

この発明による繊維強化プラスチック線状体は,次のように規定することもできる。すなわち,第2の発明による損傷検知機能付繊維強化プラスチック線状体は,樹脂が含侵された複数の繊維トウを束ねることによって構成されるものであって,隣接する繊維トウ間に形成される谷部が,隣接する繊維トウ間に所定の大きさ以上の位置ずれが作用したときにひび割れが入る塗料によって,長手方向に連続して覆われていることを特徴とする。   The fiber-reinforced plastic linear body according to the present invention can also be defined as follows. That is, the fiber reinforced plastic linear body with a damage detection function according to the second invention is constituted by bundling a plurality of fiber tows that are impregnated with resin, and is formed between adjacent fiber tows The valley portion is characterized by being continuously covered in the longitudinal direction by a paint which is cracked when positional deviation of a predetermined size or more acts between adjacent fiber tows.

線条体に外力が加わると,隣接する繊維トウ間の間隔が拡がったり,隣接する繊維トウ同士の長手方向の位置がずれたりする。所定の大きさの位置ずれ(隣接する繊維トウ間の拡がりや長手方向の位置ずれ)が作用することで,隣接する繊維トウ間の谷部の塗料にひび割れが発生する。ひび割れによってその線条体は損傷を受けたものであることが分かる。引張強度が低下しているまたはその可能性のあることを把握することができ,そのような線条体を誤って使用してしまうことを未然に防ぐことができる。   When an external force is applied to the filament, the distance between adjacent fiber tows may expand, or the position of the adjacent fiber tows in the longitudinal direction may shift. As a result of the positional deviation of a predetermined size (the spread between the adjacent fiber tows and the positional deviation in the longitudinal direction), the paint in the valley between the adjacent fiber tows is cracked. The cracks show that the striatum is damaged. It is possible to grasp that the tensile strength is lowered or the possibility of it, and to prevent the accidental use of such a striated body.

さらにこの発明による繊維強化プラスチック線条体は次のように規定してもよい。すなわち,第3の発明による損傷検知機能付繊維強化プラスチック線状体は,樹脂が含侵された複数の繊維トウを束ねることによって構成されるものであって,隣接する繊維トウ間に形成される谷部が,上記繊維強化プラスチック線状体に所定の角度以上の曲げが加えられたときにひび割れが入る塗料によって,長手方向に連続して覆われていることを特徴とする。線条体が強く曲げられたたとえば40°〜50°以上の角度に曲げられたときに塗料に生じるひび割れによって,線条体の引張強度の低下の可能性を把握することができる。   Furthermore, the fiber-reinforced plastic filament according to the present invention may be defined as follows. That is, the fiber reinforced plastic linear body with a damage detection function according to the third invention is constituted by bundling a plurality of fiber tows which are impregnated with resin, and is formed between adjacent fiber tows The valley portion is characterized by being continuously covered in the longitudinal direction by a paint which cracks when the fiber reinforced plastic linear body is bent at a predetermined angle or more. It is possible to grasp the possibility of a decrease in the tensile strength of the filament by the cracks occurring in the paint when the filament is bent to an angle of, for example, 40 ° to 50 ° which is strongly bent.

塗料が持つ破断伸びによって塗料にひび割れが発生するときの外力の大きさを異ならせる(調整する)ことができる。たとえば,繊維強化プラスチック線状体の周方向に並ぶ複数の谷部のそれぞれを,破断伸びの異なる複数種類の塗料によって埋めてもよい。線状体に所定の大きさ以上の外力が加わった事実のみならず,線条体に加わった外力の大きさを,いずれの塗料にひび割れが生じているかに応じて確認することができる。谷部の深さ方向に破断伸びの異なる複数種類の塗料を複数層に設けてもよい。たとえば,谷部の深い箇所から浅い箇所に向けて破断伸びが大きい順番に複数の塗装を設けておくと,ひび割れの深さによって線条体に加わった外力の大きさを確認することができる。   The magnitude of external force when a crack occurs in the paint can be made different (adjusted) by the breaking elongation of the paint. For example, each of the plurality of valleys aligned in the circumferential direction of the fiber-reinforced plastic linear body may be filled with a plurality of types of paint having different breaking elongations. Not only the fact that an external force of a predetermined size or more is applied to the linear body, but also the magnitude of the external force applied to the filament can be confirmed according to which paint is cracked. A plurality of types of paint having different breaking elongations in the depth direction of the valley may be provided in a plurality of layers. For example, if a plurality of coatings are provided in order of increasing breaking elongation from the deep part of the valley toward the shallow part, the magnitude of the external force applied to the wire can be confirmed by the depth of the crack.

塗料被覆炭素繊維ケーブルの外観を最外周の塗料の一部を破断して示す。The appearance of a paint coated carbon fiber cable is shown with a portion of the outermost paint broken away. 図1のII−II線沿う拡大断面図である。It is an expanded sectional view which follows the II-II line of FIG. 程度の異なる曲げを加えた炭素繊維ケーブルの引張破断荷重の試験結果を示す。The test result of the tensile breaking load of the carbon fiber cable which added a different degree of bending is shown. 塗料にひび割れが発生している状態を示す写真である。It is a photograph which shows the state which the crack has generate | occur | produced in the coating material.

図1は塗料被覆炭素繊維ケーブルの外観を示している。図2は図1のII−II線に沿う炭素繊維ケーブルの拡大断面図である。図2において,後述する被覆材5の厚さがかなり強調されて描かれている。   FIG. 1 shows the appearance of a paint-coated carbon fiber cable. FIG. 2 is an enlarged cross-sectional view of the carbon fiber cable taken along line II-II of FIG. In FIG. 2, the thickness of the covering material 5 to be described later is drawn with a considerable emphasis.

塗料被覆炭素繊維ケーブル1は炭素繊維ケーブル10の外周面を塗料6によって覆ったものである。この実施例の炭素繊維ケーブル10は,中心に配置された1本の炭素繊維トウ2(心線,心ストランド)と,その周囲に撚り合わされた6本の炭素繊維トウ2(側線,側ストランド)の,合計7本の炭素繊維トウ2から構成されている(1×7構造)。断面からみて,炭素繊維ケーブル10および炭素繊維トウ2はいずれもほぼ円形の形状を有しており,炭素繊維ケーブル10はたとえば5mm〜20mm程度の直径を持つ。炭素繊維ケーブル10の外層の6本の炭素繊維トウ2は炭素繊維ケーブル10の長手方向にらせん状にのびており,隣接する炭素繊維トウ2の間にはらせん状にのびる谷部2Aが形成されている。   The paint-coated carbon fiber cable 1 is obtained by covering the outer peripheral surface of a carbon fiber cable 10 with a paint 6. The carbon fiber cable 10 of this embodiment has one carbon fiber tow 2 (fiber core, core strand) disposed at the center, and six carbon fiber tows 2 (side wire, side strand) twisted around the periphery thereof. It consists of a total of 7 carbon fiber tows 2 (1 x 7 structure). In cross section, the carbon fiber cable 10 and the carbon fiber tow 2 both have a substantially circular shape, and the carbon fiber cable 10 has a diameter of, for example, about 5 mm to 20 mm. The six carbon fiber tows 2 of the outer layer of the carbon fiber cable 10 are spirally extended in the longitudinal direction of the carbon fiber cable 10, and the spirally extending valleys 2A are formed between the adjacent carbon fiber tows 2 There is.

炭素繊維ケーブル10を構成する炭素繊維トウ2は,いずれも熱硬化性樹脂(たとえばエポキシ樹脂)または熱可塑性樹脂(たとえばポリアミド)4を含浸させた多数本たとえば数万本の長尺の炭素繊維(炭素繊維製の素線)3を断面円形に束ねたもので,炭素繊維ケーブル10の全体で数十万本程度の炭素繊維3が含まれる。炭素繊維3のそれぞれは非常に細く,たとえば5μm〜7μmの直径を持つ。炭素繊維ケーブル10および炭素繊維トウ2は,炭素繊維強化プラスチック(CFRP)(Carbon Fiber Reinforced Plastics)製のものと言うこともできる。以下,炭素繊維3に含侵される熱硬化性または熱可塑性樹脂4を,単に樹脂4と呼ぶ。   The carbon fiber tow 2 constituting the carbon fiber cable 10 is a large number of, for example, several tens of thousands of long carbon fibers impregnated with a thermosetting resin (for example, epoxy resin) or a thermoplastic resin (for example, polyamide) 4 A carbon fiber strand 3 is bundled in a circular cross section, and the whole of the carbon fiber cable 10 contains several hundreds of thousands of carbon fibers 3. Each of the carbon fibers 3 is very thin, for example having a diameter of 5 μm to 7 μm. The carbon fiber cable 10 and the carbon fiber tow 2 can also be said to be made of carbon fiber reinforced plastic (CFRP). Hereinafter, the thermosetting or thermoplastic resin 4 impregnated into the carbon fiber 3 is simply referred to as the resin 4.

炭素繊維トウ2のそれぞれの外周に被覆材5が巻き付けられており,炭素繊維トウ2を構成する多数本の炭素繊維3の束は被覆材5によってその周囲が拘束されている。被覆材5はたとえば樹脂4が完全に硬化していない状態の炭素繊維トウ2に繊維糸を緊密に巻き付けることによって形成され,この場合には被覆材5にも樹脂4が含侵する(染み込む)。繊維糸は無機繊維糸であっても有機繊維糸であってもよい。もっとも被覆材5に樹脂4を含侵させる必要は必ずしもない。   The covering material 5 is wound around the outer periphery of each of the carbon fiber tows 2, and the bundle of many carbon fibers 3 constituting the carbon fiber tow 2 is restrained by the covering material 5 at the periphery thereof. The covering material 5 is formed, for example, by tightly winding a fiber yarn around the carbon fiber tow 2 in a state where the resin 4 is not completely cured. In this case, the covering material 5 is also impregnated with the resin 4 . The fiber yarn may be an inorganic fiber yarn or an organic fiber yarn. However, it is not necessary to impregnate the covering material 5 with the resin 4.

炭素繊維トウ2および被覆材5に含侵されている樹脂4は,熱処理(樹脂4が熱硬化性樹脂の場合)または冷却処理(樹脂4が熱可塑性樹脂の場合)を経ることで硬化される。   The resin 4 impregnated in the carbon fiber tow 2 and the covering material 5 is cured through heat treatment (when the resin 4 is a thermosetting resin) or cooling treatment (when the resin 4 is a thermoplastic resin) .

炭素繊維ケーブル10の外周面の全体を被覆する塗料6には,たとえばエポキシ樹脂を主成分とする白色塗料を用いることができる。   For example, a white paint containing an epoxy resin as a main component can be used as the paint 6 for covering the entire outer circumferential surface of the carbon fiber cable 10.

炭素繊維ケーブル10は,長手方向の高い引張強度と比較して,これと直交する方向から加わる外力に対する強度はさほど高くはない。たとえば,施工現場や保管現場において炭素繊維ケーブル10が不用意に蹴られたり,踏まれたりする,または大きな曲げ角度で炭素繊維ケーブル10が曲げられると,その箇所の炭素繊維ケーブル10(炭素繊維トウ2)が損傷する(典型的には断線する)ことがあり,炭素繊維ケーブル10が損傷することでその引張強度は低下する。   The carbon fiber cable 10 is not so high in strength against an external force applied from the direction orthogonal to it, as compared with the high tensile strength in the longitudinal direction. For example, if carbon fiber cable 10 is inadvertently kicked or stepped on a construction site or a storage site, or if carbon fiber cable 10 is bent at a large bending angle, carbon fiber cable 10 at that point 2) may be damaged (typically broken), and the tensile strength of the carbon fiber cable 10 may be reduced due to the damage.

炭素繊維ケーブル10は樹脂4が含侵された多数本の炭素繊維3を束ねた炭素繊維トウ2を複数本撚り合わせることによって構成されているので,炭素繊維ケーブル10が真っ二つ完全に分断される(ぽっきりと折れる)ことはほとんどなく,炭素繊維ケーブル10の損傷の有無を外観から判別するのは簡単ではない。   Since the carbon fiber cable 10 is formed by twisting together a plurality of carbon fiber tows 2 in which a large number of carbon fibers 3 in which the resin 4 has been impregnated is bundled, the carbon fiber cable 10 is completely divided into two It is not easy to distinguish from the appearance whether the carbon fiber cable 10 is damaged or not.

図3は,程度の異なる曲げを加えた図1および図2に示す構造を備える直径15.2mmの炭素繊維ケーブル10の引張破断荷重の試験結果(複数の試験結果の平均)を示している。曲げが加えられた炭素繊維ケーブル10は隣接する炭素繊維トウ2間に位置ずれ(隣接する繊維トウ2間の間隔の拡がりや隣接する繊維トウ2同士の長手方向の位置ずれ)が作用し,曲げ角度が大きくなるほど位置ずれは大きくなる。   FIG. 3 shows the test results (average of test results) of tensile breaking load of a 15.2 mm diameter carbon fiber cable 10 having the structure shown in FIGS. 1 and 2 with different degrees of bending. The carbon fiber cable 10 to which bending has been applied is affected by displacement between adjacent carbon fiber tows 2 (the spread of the distance between the adjacent fiber tows 2 and the displacement of the adjacent fiber tows 2 in the longitudinal direction). The larger the angle, the larger the misalignment.

2,200mmの全長を持つ炭素繊維ケーブルを用意し,その中心を治具を用いて固定する。治具の端部から300mm離れた箇所を手で掴んで一方向に力を加えることで,半長の1,100mmの長さの炭素繊維ケーブルに曲げを加えた。曲げを加えることで移動する炭素繊維ケーブルの端部から曲げを加える前の炭素繊維ケーブルのライン位置に至る垂線の長さxを計測する。曲げ角度は,曲げが加えられる炭素繊維ケーブルの長さ( 1,100mm)と上記垂線の長さxとを用いて,逆正弦によって,すなわち θ=arcsin(x/1,100)によって算出した。    Prepare a carbon fiber cable with a total length of 2,200 mm, and fix its center using a jig. A half length of 1,100 mm long carbon fiber cable was bent by holding a 300 mm distance from the end of the jig by hand and applying a force in one direction. Measure the length x of the perpendicular from the end of the moving carbon fiber cable by applying bending to the line position of the carbon fiber cable before applying bending. The bending angle was calculated by the inverse sine, that is, by θ = arcsin (x / 1, 100), using the length (1, 100 mm) of the carbon fiber cable to which the bending is applied and the length x of the perpendicular.

50°程度までの曲げ角度の曲げを加えるにとどまれば,炭素繊維ケーブル10の引張破断荷重の低下はない。曲げ角度が50°を超える(60°近く)と,炭素繊維ケーブル10の引張破断荷重の低下が生じ始めている。また,50°を超えて曲げ角度が大きくなればなるほど炭素繊維ケーブル10の引張破断荷重は大きく低下している。すなわち,曲げ角度が50°を超えると炭素繊維ケーブル10に損傷が発生し始め,損傷のない炭素繊維ケーブル10の引張強度を保つことができなくなる。   There is no reduction in the tensile breaking load of the carbon fiber cable 10 if bending at a bending angle of up to about 50 ° is applied. When the bending angle exceeds 50 ° (near 60 °), the decrease in the tensile breaking load of the carbon fiber cable 10 starts to occur. Moreover, the tensile breaking load of the carbon fiber cable 10 is greatly reduced as the bending angle becomes larger than 50 °. That is, if the bending angle exceeds 50 °, damage to the carbon fiber cable 10 starts to occur, and the tensile strength of the undamaged carbon fiber cable 10 can not be maintained.

炭素繊維ケーブル10の損傷の有無を外観から判別するために塗料6が用いられる。   The paint 6 is used to determine from the appearance whether or not the carbon fiber cable 10 is damaged.

図4の写真は,炭素繊維ケーブル10の表面全体を1%の破断伸びを持つ塗料6によって被覆した塗料被覆炭素繊維ケーブル1に50°の曲げを加えたときの外観を示している。塗料6,特に隣り合う炭素繊維トウ2の間の谷部2Aを覆っている塗料6に複数のひび割れ6Aが発生していることが確認される。他方,谷部2Aではない炭素繊維トウ2の表面を覆っている塗料6にはひび割れ6Aが発生していないことも確認される。   The photograph of FIG. 4 shows the appearance when a 50 ° bend is applied to the paint-coated carbon fiber cable 1 in which the entire surface of the carbon fiber cable 10 is coated with the paint 6 having a breaking elongation of 1%. It is confirmed that a plurality of cracks 6A are generated in the paint 6, particularly the paint 6 covering the valleys 2A between adjacent carbon fiber tows 2. On the other hand, it is also confirmed that the paint 6 covering the surface of the carbon fiber tow 2 which is not the valley portion 2A does not have the crack 6A.

1%の破断伸びを有する塗料6を被覆した塗料被覆炭素繊維ケーブル1では,曲げ角度が40°を超えたあたりで谷部2Aを覆っている塗料6にひび割れ6Aが発生し始め,曲げ角度50°を超えると,図4に示すように多数のひび割れ6Aが目立つようになる。すなわち,40°を超える曲げが加えられたまたはそれに相当する外力(側圧,面せん断力)が加えられた塗料被覆炭素繊維ケーブル1であることを,塗料6に発生しているひび割れ6Aによって視覚的に把握することができる。   In paint-coated carbon fiber cable 1 coated with paint 6 having a 1% elongation at break, cracks 6A begin to occur in paint 6 covering valley portion 2A when the bending angle exceeds 40 °, and bending angle 50 When the angle is exceeded, a large number of cracks 6A become noticeable as shown in FIG. That is, the paint-covered carbon fiber cable 1 to which a bending force exceeding 40 ° or an equivalent external force (side pressure, surface shear force) is applied is visually recognized by the crack 6A generated in the paint 6 Can be grasped.

塗料被覆炭素繊維ケーブル1は,搬送のためにリールやドラムに巻き回され,このときに緩やかに曲げられるが,リールやドラムに巻き回されたときの曲げ角度は数度から十数度程度の曲げ角度に相当し,この程度の曲げから生じる外力では炭素繊維ケーブル10の引張強度は低下せず(図3参照),塗料6にひび割れ6Aは発生しない。すなわち,谷部2Aを覆う塗料6に発生するひび割れ6Aを,引張強度の低下が発生し得る程度の大きさの外力が塗料被覆炭素繊維ケーブル1に加わった事実またはその可能性を示す目印とすることができる。   The paint-coated carbon fiber cable 1 is wound around a reel or drum for transportation, and is gently bent at this time, but the bending angle when wound around a reel or drum is several degrees to several tens of degrees The external force resulting from this degree of bending does not reduce the tensile strength of the carbon fiber cable 10 (see FIG. 3), and no cracks 6A occur in the coating material 6. That is, the crack 6A generated in the paint 6 covering the valley portion 2A is used as a mark indicating the fact that an external force having a magnitude that can cause a reduction in tensile strength is applied to the paint-covered carbon fiber cable 1 be able to.

破断伸びの異なる塗料6を用いることによって,ひび割れ6Aが発生しはじめる曲げ角度(外力の大きさ)を調整することができる。たとえばより小さい破断伸び(たとえば 0.5%)を有する塗料6であれば,40°よりも小さい曲げ角度でひび割れ6Aを発生させることができるし,より大きい破断伸び(たとえば10%)を有する塗料6であれば,40°よりも大きな曲げ角度に至ったときにひび割れ6Aを発生させることができる。 0.5〜10%の範囲の破断伸びを持つ塗料6を用いれば,リールやドラムに巻き回すために緩やかに曲げられたときに塗料6にひび割れ6Aを発生させずに,かつ引張強度が低下した可能性があるときに塗料6にひび割れ6Aを発生させることが可能である。   By using the paint 6 having a different breaking elongation, it is possible to adjust the bending angle (the magnitude of the external force) at which the crack 6A starts to occur. For example, with paint 6 having a smaller breaking elongation (eg 0.5%), cracks 6A can be generated at a bending angle smaller than 40 °, and with paint 6 having a larger breaking elongation (eg 10%) If so, the crack 6A can be generated when a bending angle larger than 40 ° is reached. If paint 6 with a breaking elongation in the range of 0.5 to 10% is used, it is possible that the paint 6 does not generate cracks 6A when it is gently bent for winding on a reel or drum, and that the tensile strength is lowered It is possible to cause the paint 6 to crack 6A when there is a tendency.

ひび割れ6Aが発生している塗料被覆炭素繊維ケーブル1は引張強度が低下しているまたはその可能性のある塗料被覆炭素繊維ケーブル1である。引張強度が低下しているまたはその可能性のあることが,ひび割れ6Aによって外観上分かりやすく示されるので,引張強度の低下した塗料被覆炭素繊維ケーブル1を誤って使用してしまうことを未然に防ぐことができる。ひび割れ6Aの有無に着目した外観検査であるから,長尺の塗料被覆炭素繊維ケーブル1を,必要な長さにわたって,さらには全長にわたって検査することができる。また,引張強度の低下検知(損傷検知)のための特別な装置は一切必要とされないので,施工現場や保管現場において塗料被覆炭素繊維ケーブル1の損傷チェックを効率的に行うことができる。   The paint-coated carbon fiber cable 1 in which the crack 6A is generated is the paint-coated carbon fiber cable 1 having a reduced tensile strength or the possibility of the reduction. The fact that the tensile strength is lowered or the possibility of it is clearly shown in appearance by the crack 6A, so that the paint-covered carbon fiber cable 1 with the lowered tensile strength is prevented from being mistakenly used be able to. Since the appearance inspection focuses on the presence or absence of the crack 6A, the long paint-coated carbon fiber cable 1 can be inspected over the required length and further over the entire length. In addition, since no special device for detecting a drop in tensile strength (damage detection) is required, damage check of the coated carbon fiber cable 1 can be efficiently performed at a construction site or a storage site.

引張強度の低下が発生し得る程度の外力が塗料被覆炭素繊維ケーブル1に加わったときに谷部2Aの塗料6に生じるひび割れ6Aであっても,その外力が塗料被覆炭素繊維ケーブル1に加わらなくなると,ひび割れ6Aは目立たなくなる。しかしながら,一度発生したひび割れ6Aは塗料6に残るので,たとえば塗料被覆炭素繊維ケーブル1を緩く曲げるだけで,ひび割れ6Aの存在を容易に確認する(目立たせる)ことができる。   Even if the crack 6A generated in the paint 6 of the valley portion 2A when an external force to the extent that a reduction in tensile strength may occur is applied to the paint-covered carbon fiber cable 1, the external force is not applied to the paint-coated carbon fiber cable 1 And, the crack 6A becomes inconspicuous. However, since the crack 6A that has occurred once remains in the paint 6, the presence of the crack 6A can be easily confirmed (noticeable), for example, only by gently bending the paint-coated carbon fiber cable 1.

上述したように,ひび割れ6Aは,炭素繊維ケーブル10の表面に形成されるらせん状の谷部2Aを覆っている塗料6に発生するので,炭素繊維ケーブル10の全体を塗料6によって覆う必要は必ずしもなく,谷部2Aに沿って,谷部2Aのみを塗料6によって覆うようにしてもよい。もっとも,塗料6の塗布のやり易さやひび割れ6Aをより目立たせることを考慮すれば,谷部2Aのみならず炭素繊維ケーブル10の全体を塗料6によって覆う方がよい。   As described above, since the crack 6A is generated in the paint 6 covering the spiral valley portion 2A formed on the surface of the carbon fiber cable 10, the whole carbon fiber cable 10 need not necessarily be covered with the paint 6 Instead, only the valley portion 2A may be covered with the paint 6 along the valley portion 2A. However, considering the ease of applying the paint 6 and making the cracks 6A more noticeable, it is better to cover the whole of the carbon fiber cable 10 with the paint 6 as well as the valley portion 2A.

上述した実施例では,炭素繊維トウ2を撚り合わせた撚り線タイプの塗料被覆炭素繊維ケーブル1を説明したが,表面に谷部が形成される構造をもつものであれば撚り線タイプ以外のケーブルにも上述した塗料6を用いた損傷検知は適用することができる。たとえば塗料被覆炭素繊維ケーブルは複数の炭素繊維トウ2を編んだ組紐タイプのものであってもよいし,複数の炭素繊維トウ2を撚り合わせることなく束ねた平行線タイプのものであってもよい。   Although in the above-described embodiment, the strand type paint-coated carbon fiber cable 1 in which the carbon fiber tows 2 are twisted is described, any cable other than the strand type may be used if it has a structure in which valleys are formed on the surface. The damage detection using the paint 6 described above can also be applied. For example, the paint-coated carbon fiber cable may be a braided type in which a plurality of carbon fiber tows 2 are knitted, or may be a parallel line type in which a plurality of carbon fiber tows 2 are bundled without twisting. .

たとえば,炭素繊維ケーブル10の周方向に並ぶ複数の谷部2Aのそれぞれを,破断伸びの異なる塗料6のそれぞれによって覆ってもよい。上述したように塗料6が持つ破断伸び特性によって塗料6にひび割れ6Aが生じるときの外力の大きさを異ならせることができるので,炭素繊維ケーブル10に所定の大きさ以上の外力が加わった事実のみならず,炭素繊維ケーブル10に加わった外力の大きさを,いずれの塗料6にひび割れ6Aが生じているかを確認することで把握することができる。さらに,谷部2Aに破断伸びの異なる複数種類の塗料6を複数層に設けてもよい。たとえば,谷部2Aの深い箇所から浅い箇所に向けて破断伸びが大きい順番に複数の塗料6を設けておくと,ひび割れ6Aの深さによって炭素繊維ケーブル10に加わった外力の大きさを確認することができる。   For example, each of the plurality of valleys 2A aligned in the circumferential direction of the carbon fiber cable 10 may be covered with each of the paints 6 having different breaking elongations. As described above, the magnitude of the external force when the crack 6A occurs in the paint 6 can be made different depending on the fracture elongation property of the paint 6, so only the fact that the carbon fiber cable 10 has an external force of a predetermined size or more In addition, the magnitude of the external force applied to the carbon fiber cable 10 can be grasped by confirming in which paint 6 the crack 6A is generated. Furthermore, a plurality of types of paint 6 having different breaking elongations may be provided in a plurality of layers in the valley portion 2A. For example, if a plurality of paints 6 are provided in order of increasing breaking elongation from the deep part of valley 2A to the shallow part, the magnitude of external force applied to carbon fiber cable 10 is confirmed by the depth of crack 6A. be able to.

1 塗料被覆炭素繊維ケーブル(損傷検知機能付炭素繊維ケーブル)
2 炭素繊維トウ
2A 谷部
3 炭素繊維(素線)
4 樹脂(熱硬化性樹脂,熱可塑性樹脂)
5 被覆材
6 塗料
6A ひび割れ
10 炭素繊維ケーブル
1 Paint coated carbon fiber cable (carbon fiber cable with damage detection function)
2 carbon fiber tow 2A valley 3 carbon fiber (wire)
4 Resin (thermosetting resin, thermoplastic resin)
5 Coating material 6 Paint 6A crack
10 carbon fiber cable

Claims (4)

樹脂が含侵された複数の繊維トウが束ねられており,
隣接する繊維トウ間に形成される谷部が,0.5〜10%の破断伸びを持つ塗料によって長手方向に連続して覆われている,
損傷検知機能付繊維強化プラスチック線状体。
Multiple fiber tows impregnated with resin are bundled,
The valleys formed between adjacent fiber tows are continuously covered longitudinally with a paint having a breaking elongation of 0.5 to 10%,
Fiber reinforced plastic linear body with damage detection function.
樹脂が含侵された複数の繊維トウが束ねられており,
隣接する繊維トウ間に形成される谷部が,隣接する繊維トウ間に所定の大きさ以上の位置ずれが作用したときにひび割れが入る塗料によって,長手方向に連続して覆われている,
損傷検知機能付繊維強化プラスチック線状体。
Multiple fiber tows impregnated with resin are bundled,
The valleys formed between adjacent fiber tows are continuously covered in the longitudinal direction by a paint that cracks when a displacement greater than a predetermined size acts between the adjacent fiber tows.
Fiber reinforced plastic linear body with damage detection function.
樹脂が含侵された複数の繊維トウが束ねられており,
隣接する繊維トウ間に形成される谷部が,上記繊維強化プラスチック線状体に所定の角度以上の曲げが加えられたときにひび割れが入る塗料によって,長手方向に連続して覆われている,
損傷検知機能付繊維強化プラスチック線状体。
Multiple fiber tows impregnated with resin are bundled,
The valleys formed between adjacent fiber tows are continuously covered in the longitudinal direction by a paint which cracks when the fiber reinforced plastic linear body is bent over a predetermined angle,
Fiber reinforced plastic linear body with damage detection function.
束ねられた複数の繊維トウの外周面全体が上記塗料によって覆われている,
請求項1から3のいずれか一項に記載の損傷検知機能付繊維強化プラスチック線状体。
The entire outer peripheral surface of the plurality of bundled fiber tows is covered with the above-mentioned paint,
The fiber reinforced plastic linear body with a damage detection function according to any one of claims 1 to 3.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0351384A (en) * 1989-04-27 1991-03-05 Ube Nitto Kasei Co Ltd Twist structural body made of fiber reinforced thermosetting resin and production thereof
JPH04161835A (en) * 1990-10-25 1992-06-05 Mitsubishi Heavy Ind Ltd Detection of looseness of bolt
JPH10267866A (en) * 1997-03-26 1998-10-09 Nkk Corp Method for inspecting crack of structure body
JP2002173881A (en) * 2000-09-19 2002-06-21 Tokyo Seiko Co Ltd Wire rope having external damage sensing function
JP2004300609A (en) * 2003-03-31 2004-10-28 Tokyo Seiko Co Ltd Fiber rope for running rig
JP2008081607A (en) * 2006-09-27 2008-04-10 Railway Technical Res Inst Conductive coating, conductive coating film, coating for detecting crack and coating film for detecting crack
JP2019073839A (en) * 2017-10-19 2019-05-16 東京製綱株式会社 Fiber-reinforced plastic filament with damage detecting function

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0351384A (en) * 1989-04-27 1991-03-05 Ube Nitto Kasei Co Ltd Twist structural body made of fiber reinforced thermosetting resin and production thereof
JPH04161835A (en) * 1990-10-25 1992-06-05 Mitsubishi Heavy Ind Ltd Detection of looseness of bolt
JPH10267866A (en) * 1997-03-26 1998-10-09 Nkk Corp Method for inspecting crack of structure body
JP2002173881A (en) * 2000-09-19 2002-06-21 Tokyo Seiko Co Ltd Wire rope having external damage sensing function
JP2004300609A (en) * 2003-03-31 2004-10-28 Tokyo Seiko Co Ltd Fiber rope for running rig
JP2008081607A (en) * 2006-09-27 2008-04-10 Railway Technical Res Inst Conductive coating, conductive coating film, coating for detecting crack and coating film for detecting crack
JP2019073839A (en) * 2017-10-19 2019-05-16 東京製綱株式会社 Fiber-reinforced plastic filament with damage detecting function

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