JP2001150433A - Shearing reinforcing thermoplastic resin coated frp rod - Google Patents
Shearing reinforcing thermoplastic resin coated frp rodInfo
- Publication number
- JP2001150433A JP2001150433A JP33192199A JP33192199A JP2001150433A JP 2001150433 A JP2001150433 A JP 2001150433A JP 33192199 A JP33192199 A JP 33192199A JP 33192199 A JP33192199 A JP 33192199A JP 2001150433 A JP2001150433 A JP 2001150433A
- Authority
- JP
- Japan
- Prior art keywords
- frp
- rope
- strand
- thermoplastic resin
- shear reinforcement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Reinforced Plastic Materials (AREA)
- Moulding By Coating Moulds (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はコンクリート補強材
の中で、せん断補強筋として使用される熱可塑性樹脂被
覆繊維強化ＦＲＰ（Ｆｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ
Ｐｌａｓｔｉｃ）筋に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced FRP (Fiber Reinforced) coated with a thermoplastic resin used as a shear reinforcement in concrete reinforcement.
Plastic) muscle.
【０００２】[0002]
【従来の技術】高強度でかつ軽量といった優れた特性を
発揮する構造物を構築する要求は建設業界のみならず多
方面から高まっている。係る要望に応えるべく現在では
特にコンクリート構造物の高強度化及び軽量化等が推進
されている。このような状況を示す一例としては、例え
ばコンクリート梁やコンクリート壁等のコンクリート構
造物の補強材として炭素繊維などの新素材からなるＦＲ
Ｐ補強筋を配筋し活用する動きがある。炭素繊維を補強
繊維とした補強筋として、ＣＦＲＰ（Ｃａｒｂｏｎ Ｆ
ｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ Ｐｌａｓｔｉｃ）が
挙げられ、特にシールド工事における発進・到達工法た
るＮＯＭＳＴ（Ｎｏｖｅｌ Ｍａｔｅｒｉａｌ Ｓｈｉ
ｅｌｄ−ｃｕｔｔａｂｌｅ Ｔｕｎｎｅｌ−ｗａｌｌ
Ｓｙｓｔｅｍ）工法などにおけるせん断補強筋として用
いられている。2. Description of the Related Art There is an increasing demand not only in the construction industry but also in many fields for constructing a structure exhibiting excellent characteristics such as high strength and light weight. In order to respond to such demands, at present, particularly, concrete structures with higher strength and lighter weight are being promoted. One example showing such a situation is, for example, FR made of a new material such as carbon fiber as a reinforcing material for concrete structures such as concrete beams and concrete walls.
There is a movement to arrange and use P reinforcement. CFRP (Carbon F) is used as a reinforcing bar using carbon fiber as a reinforcing fiber.
BER Reinforced Plastic), and in particular, NOMST (Novel Material Shi), which is a starting and arriving construction method in shield construction.
eld-cuttable Tunnel-wall
(System) construction method.
【０００３】このＮＯＭＳＴ工法におけるせん断補強筋
の役割は、発進・到達立坑の坑口開削時において、係る
せん断補強筋が配筋された土留め壁が地下水圧や土圧等
に対抗しうる優れた構造強度を備えつつ、係る土留め壁
をシールドマシンが開削するにあたってはカッタービッ
トにより簡便確実に切断可能であるといった特性を発揮
することにある。上記の如き特性を備えるべく従来から
用いられているせん断補強用ＦＲＰ筋としては、例え
ば、ＣＦＲＰプリプレグ（炭素繊維を引き揃えて熱硬化
性樹脂を含浸したものを半硬化させたものであるプリプ
レグを、ストランドとして撚り合わせたもの）を矩形螺
旋状に成形したもの、また、同様にして作成したテープ
状のプリプレグを金型に巻き付けてリング状に成形した
ものをロッド状ＣＦＲＰと組み合わせ、籠状に構成した
ものなどが挙げられる。[0003] The role of the shear reinforcement in the NOMST method is that an excellent retaining structure in which the shear reinforcement is arranged can withstand groundwater pressure, earth pressure, etc., when opening the opening of the start / reach shaft. The feature is to exhibit such a property that the shield machine can easily and reliably cut the earth retaining wall with a cutter bit while providing the strength. Conventionally used shear reinforcement FRP bars having the above-mentioned properties include, for example, CFRP prepregs (prepregs obtained by semi-curing a thermosetting resin impregnated with aligned carbon fibers). , Strands twisted as strands) formed into a rectangular spiral, and a tape-shaped prepreg formed in the same manner wound around a mold and formed into a ring is combined with a rod-shaped CFRP to form a cage. And the like.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
せん断補強用ＦＲＰ筋は次に述べるような課題を有して
いた。すなわち、係る従来のせん断補強筋はまずその製
造に際して多くの課題を有し、前記プリプレグの製造工
程、ストランドの撚り工程及び硬化工程と工程数が多
く、必要とされる設備、作業時間及び配置される人員等
の全ての面で過大な対価コストを強いられ、良好な作業
効率と経済性とを確保することは困難であった。また、
プリプレグの作成においては各種溶剤が使用される場合
が多く、溶剤使用に際して遵守が求められる各種規定等
に基づく手順に拘束されることとなって、いたずらに作
業の煩雑性を招いていた。 更に、前記硬化工程では、
所定の形状を得るためにプリプレグの状態から金型等に
巻き付けて固定するため、作業中にプリプレグを軟化さ
せるため適宜熱を加えながら各種作業を実施する必要が
あり、作業が煩雑となり加工スピードの著しい低下をみ
ることとなった。一方、この硬化工程においてプリプレ
グの早期硬化を抑制する意味でエポキシ樹脂が使用され
ることがあったが、係る樹脂の硬化にはかなりの長時間
を要し却って生産性に劣る結果となっていた。上述の各
種課題のため、従来のせん断補強筋は一般の鉄筋に比し
て著しくコスト高となり経済的な面において汎用性は低
かった。However, the conventional shear reinforcement FRP bars have the following problems. That is, such a conventional shear reinforcement first has many problems in the production thereof, the prepreg production process, the strand twisting process and the curing process and the number of processes are large, the required equipment, work time and arrangement are required. It was difficult to secure good work efficiency and economic efficiency due to excessive compensation costs in all aspects such as personnel. Also,
In the preparation of the prepreg, various solvents are used in many cases, and the use of the solvent is restricted by procedures based on various regulations and the like that are required to be adhered to, and the operation is unnecessarily complicated. Further, in the curing step,
In order to obtain a predetermined shape, it is necessary to perform various operations while appropriately applying heat to soften the prepreg during the operation in order to soften the prepreg from the state of the prepreg in order to fix the prepreg from the state of the prepreg. A remarkable decrease was observed. On the other hand, in this curing step, epoxy resin was sometimes used in the sense of suppressing early curing of the prepreg, but curing of such a resin required a considerably long time, resulting in poor productivity. . Due to the various problems described above, the conventional shear reinforcement has a remarkably higher cost than general reinforcing steel, and has low versatility in terms of economy.
【０００５】そして、このような各種問題を抱えた工程
を経て製造されたプリプレグをスパイラル状、或いは籠
状など種々の形状に形成してせん断補強用ＦＲＰ筋とな
すとしても、コンクリートの付着性能や引張り強度等を
確実に得るために特に定まった構造もなく、せん断補強
筋として求められる物性を確実に発現することは困難で
あった。従って、ＮＯＭＳＴ工法等の実際の施工を行う
にあたり、せん断補強筋として期待される補強効果が曖
昧となり、しかもせん断補強筋自体のコストが嵩みいず
れの工事においても汎用可能であるとは言えなかった。[0005] Even if the prepreg manufactured through the process having such various problems is formed into various shapes such as a spiral shape or a cage shape to form an FRP bar for shear reinforcement, it is difficult to improve the adhesion performance of concrete. There is no specific structure for reliably obtaining the tensile strength and the like, and it has been difficult to reliably exhibit the physical properties required for the shear reinforcement. Therefore, when performing the actual construction such as the NOMST method, the reinforcement effect expected as the shear reinforcement becomes ambiguous, and the cost of the shear reinforcement itself increases, and it cannot be said that the reinforcement is versatile in any construction. .
【０００６】そこで、本発明はこのような従来の課題に
着目してなされたもので、コンクリートとの付着性能に
優れ、引っ張り強度等のせん断補強筋としての必要物性
を確実に備えると共に、生産性も良好であるせん断補強
筋を提供するものである。Accordingly, the present invention has been made in view of such conventional problems, and has excellent adhesion performance to concrete, reliably provides necessary physical properties as a shear reinforcing bar such as tensile strength, and has a high productivity. Also provide good shear reinforcement.
【０００７】[0007]
【課題を解決するための手段】この発明は上記目的を達
成するためになされたもので、熱硬化性樹脂が含浸さ
れ、外周面が熱可塑性樹脂で被覆された補強繊維束であ
るＦＲＰストランドを用いたせん断補強用熱可塑性樹脂
被覆ＦＲＰ筋であって、少なくとも一本の前記ＦＲＰス
トランドを芯ストランドとし、その外周に６本の外周ス
トランドがスパイラル状に撚り合わされたＦＲＰロープ
を、コーナー部半径が該ＦＲＰロープ外径の３倍〜５倍
となる矩形螺旋状に成形してなることを特徴とする。DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and is intended to provide an FRP strand which is a reinforcing fiber bundle impregnated with a thermosetting resin and whose outer peripheral surface is coated with a thermoplastic resin. A shear-strengthening thermoplastic resin-coated FRP streak, wherein at least one FRP strand is used as a core strand, and six outer strands are spirally twisted around the outer periphery of the FRP rope. It is characterized by being formed into a rectangular spiral having an outer diameter of 3 to 5 times the outer diameter of the FRP rope.
【０００８】また、他の要旨として、熱硬化性樹脂が含
浸され、外周面が熱可塑性樹脂で被覆された補強繊維束
であるＦＲＰストランドを用いたせん断補強用熱可塑性
樹脂被覆ＦＲＰ筋であって、８本の前記ＦＲＰストラン
ドを八つ打ちロープ状に編組みした八つ打ちＦＲＰロー
プを、コーナー部半径が該八つ打ちＦＲＰロープ外径の
３倍〜５倍となる矩形螺旋状に成形してなることを特徴
とする。In another aspect, the present invention provides a thermoplastic resin-coated FRP streak for shear reinforcement using an FRP strand, which is a reinforcing fiber bundle impregnated with a thermosetting resin and having an outer peripheral surface coated with a thermoplastic resin. An eight-stroke FRP rope formed by braiding the eight FRP strands into an eight-strand rope shape is formed into a rectangular spiral shape having a corner radius of three to five times the outer diameter of the eight-strand FRP rope. It is characterized by becoming.
【０００９】更に、前記ＦＲＰロープ或いは八つ打ちＦ
ＲＰロープを、硬化時張力(g)／（補強繊維の総重量(g/
m)×９０００）により定義される硬化時張力係数が０．
００５以上０．０２５以下であり、かつ、矩形螺旋状の
せん断補強用熱硬化性樹脂被覆ＦＲＰ筋となすと好適で
ある。ここで、硬化時張力係数をｃで表すと、 張力（ｇ）＝補強繊維の総重量（ｇ／ｍ）×９０００×
ｃ の関係式が成り立ち、本発明においては係る式中の関係
で硬化時張力係数たるｃが０．００５以上０．０２５以
下の範囲内となるのである。Further, the above-mentioned FRP rope or eight-strike F
The RP rope is hardened at the time of curing (g) / (total weight of reinforcing fiber (g /
m) × 9000) has a tension coefficient upon curing of 0.
It is suitable to form a rectangular spiral spiral reinforcing thermosetting resin-coated FRP streak of not less than 005 and not more than 0.025. Here, when the tension coefficient at the time of curing is represented by c, tension (g) = total weight of reinforcing fiber (g / m) × 9000 ×
The relational expression of c is established, and in the present invention, c, which is the tension coefficient at the time of hardening, is in the range of 0.005 or more and 0.025 or less in the relation in the expression.
【００１０】[0010]
【発明の実施の形態】以下、本発明の好ましい実施の形
態につき、添付図面を参照して詳細に説明する。図１は
本発明のせん断補強用熱可塑性樹脂被覆ＦＲＰ筋を構成
するＦＲＰロープ１０を示し、（ａ）はその断面図、
（ｂ）は同側面図である。図２は係るＦＲＰロープ１０
を用いた、コーナー部半径が該ＦＲＰロープ１０外径の
３倍となる矩形螺旋状のせん断補強用熱可塑性樹脂被覆
ＦＲＰ筋２０を示す説明図であり、図３は同せん断補強
用ＦＲＰ筋２０のコーナー部Ｒ拡大図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an FRP rope 10 constituting a thermoplastic resin-coated FRP streak for shear reinforcement according to the present invention, and FIG.
(B) is the same side view. FIG. 2 shows such an FRP rope 10.
FIG. 3 is an explanatory view showing a rectangular helical shear-reinforced thermoplastic resin-coated FRP streak 20 whose corner radius is three times the outer diameter of the FRP rope 10, and FIG. 5 is an enlarged view of a corner portion R of FIG.
【００１１】実施例１として、図１に示す様な、補強繊
維Ｆに熱硬化性樹脂１３を含浸させその外周面を熱可塑
性樹脂１４で被覆したＦＲＰストランドＡを基本構成要
素とし、１本のＦＲＰストランドＡを芯ストランド１１
とし、その外周に６本の外周ストランド１２をスパイラ
ル状に撚り合わせたＦＲＰロープ１０を、コーナー部半
径が該ＦＲＰロープ１０外径の３倍となる矩形螺旋状に
成形してなるせん断補強用熱可塑性樹脂被覆ＦＲＰ筋２
０（以下、せん断補強筋と称する。図２、図３参照）に
ついて以下に示す。使用材料、設定寸法、設定単位重
量、製造条件等は下記の通りである。As a first embodiment, as shown in FIG. 1, an FRP strand A in which a reinforcing fiber F is impregnated with a thermosetting resin 13 and whose outer peripheral surface is covered with a thermoplastic resin 14 is used as a basic component. FRP strand A to core strand 11
The heat for shear reinforcement is obtained by forming an FRP rope 10 in which six outer strands 12 are spirally twisted around its outer periphery into a rectangular spiral shape having a corner radius three times the outer diameter of the FRP rope 10. FRP bar 2 coated with plastic resin
0 (hereinafter, referred to as shear reinforcing bars; see FIGS. 2 and 3) is shown below. Materials used, set dimensions, set unit weights, manufacturing conditions, and the like are as follows.
【００１２】−−使用材料−− 強化繊維（商品名：トレカＴ７００Ｓ １２Ｋ、東レ
株式会社製、 １２０００フィラメント、８８０ｄｔｅｘ）、 １２本（ｃ．ｃ＝５５．４ｖｏｌ％） 熱硬化性樹脂１(商品名：エスターＨ２０００ＨＶ、
三井化学株式会社製)、 ８０ブ 熱硬化性樹脂２(商品名：ＮＫエステル３Ｇ、新中村
化学株式会社製)、 ２０ブ 熱硬化性樹脂３(商品名：カドックスＢ−ＣＨ５０、
化薬アクゾ株式会社製)、 ４ブ 熱硬化性樹脂４（商品名：カヤブチルＢ、化薬アクゾ
株式会社製）、 ０．５ブ 被覆樹脂（ナイロン１２、ダイアミド）、８０℃ 一
昼夜乾燥 −−設定寸法−− 被覆外径４ｍｍ、ＦＲＰ径３．５ｍｍ(被覆厚み０．２
５ｍｍ設定)--- Materials used-- Reinforcing fiber (trade name: Torayca T700S 12K, manufactured by Toray Industries, Inc., 12000 filament, 880 dtex), 12 filaments (cc = 55.4 vol%) Thermosetting resin 1 (trade name) : Esther H2000HV,
80B thermosetting resin 2 (trade name: NK ester 3G, manufactured by Shin-Nakamura Chemical Co., Ltd.), 20b thermosetting resin 3 (trade name: Cadox B-CH50,
Kabuyaku Akzo Co., Ltd.), 4b thermosetting resin 4 (trade name: Kayabutyl B, Kayaku Akzo Co., Ltd.), 0.5b coating resin (nylon 12, diamide), drying at 80 ° C all day and night --- setting Dimensions-Coating outer diameter 4mm, FRP diameter 3.5mm (Coating thickness 0.2
(5mm setting)
【００１３】図示しないが、上記の材料を用いてＦＲＰ
ストランドＡを製造する実際工程としては、補強繊維Ｆ
を供給するロービングスタンドをＦＲＰストランド数だ
け（ここでは７箇所）配置し、繊維ガイドを介して未硬
化状熱硬化性樹脂（例えば不飽和ポリエステル樹脂等）
が貯留された樹脂槽に補強繊維Ｆを挿通させることで熱
硬化性樹脂に含浸させ、しかる後に、これを所定の繊維
含有率まで余分な樹脂を絞りながら引き揃えて芯部を形
成した後、クロスヘッドダイ内を通過させ、溶融状の熱
可塑性樹脂を該芯部外周面に被覆することにより、未硬
化状態のＦＲＰストランドＡを形成することとなる。[0013] Although not shown, the above materials are used for FRP.
The actual process of manufacturing the strand A includes reinforcing fibers F
The number of FRP strands (in this case, seven) is arranged on the roving stand that supplies the uncured thermosetting resin (eg, unsaturated polyester resin) via the fiber guide.
After impregnating the thermosetting resin by penetrating the reinforcing fiber F into the resin tank in which is stored, and thereafter, after squeezing the excess resin while squeezing excess resin to a predetermined fiber content to form a core portion, An uncured FRP strand A is formed by passing through a crosshead die and coating the outer peripheral surface of the core with a molten thermoplastic resin.
【００１４】次に、未硬化状態のＦＲＰストランドＡ
を、１本の芯ストランド１１を中心として６本の外周ス
トランド１２が撚り合わさった計７本撚りの構造をなす
ＦＲＰロープ１０に加工する。本実施例において７本撚
りとした撚り構造について、これ以上の本数からなる撚
り構造は、撚り工程が複雑になり必要とされる機器類も
増加することから実用的ではない。また、構成ストラン
ド数が増加することで断面積が増大し、ねじりやひねり
等の素線の乱れも生じやすくなり硬化時の作業性が低劣
なものとなりやすい（例えば、１９本（１＋６＋１２）
撚り等では、硬化時に撚りが乱れやすいことが分かって
いる）。Next, uncured FRP strand A
Is processed into an FRP rope 10 having a total of seven twisted structures in which six outer strands 12 are twisted around one core strand 11. With respect to the seven-strand structure in this embodiment, a twist structure having more twists is not practical because the twisting process becomes complicated and required equipment increases. In addition, as the number of constituent strands increases, the cross-sectional area increases, and the strands such as twisting and twisting are likely to be disturbed, and the workability at the time of curing tends to be poor (for example, 19 (1 + 6 + 12)).
It is known that twisting tends to be disturbed during curing.
【００１５】図示しないが、加工手順として、未硬化状
ＦＲＰストランドＡを巻き取ったボビン７巻をクリール
スタンドに固定し、該スタンドから供給されるＦＲＰス
トランドＡを撚り機（例えば回転巻き取り機）にてスパ
イラル状に撚り合わせることで、７本撚りＦＲＰロープ
１０（未硬化状）を作成した。ここで、撚りピッチは８
０ｍｍとし、撚り張力は中央の１本を１．１ｋｇ、周囲
の６本を１ｋｇとした（係る撚り張力はクリールスタン
ドが備えるブレーキにて調整する）。Although not shown, as a processing procedure, seven bobbins around which the uncured FRP strand A has been wound are fixed to a creel stand, and the FRP strand A supplied from the stand is twisted (for example, a rotary winder). By twisting in a spiral shape at 7, a seven-strand FRP rope 10 (uncured) was created. Here, the twist pitch is 8
The twist tension was set to 1.1 kg for the central one and to 1 kg for the six strands (the twist tension is adjusted by a brake provided in the creel stand).
【００１６】次に、巻き取った未硬化状ＦＲＰロープ１
０を図４に示す硬化ジグ４０により矩形螺旋状に硬化さ
せ、最終的にせん断補強筋２０を製造した。矩形螺旋形
状におけるコーナー部Ｒの半径をＦＲＰロープ１０外径
の３倍（ここでは３６ｍｍ）とし、硬化時の張力は１０
ｋｇ（ロープ１０の片端末に１０ｋｇの重錘を垂下し
た）とした。この硬化時の硬化張力については構造強度
の上で重要であり、以下の計算式により得られる範囲内
とする必要がある。Next, the wound uncured FRP rope 1
No. 0 was hardened in a rectangular spiral shape by a hardening jig 40 shown in FIG. The radius of the corner portion R in the rectangular spiral shape is set to be three times the outer diameter of the FRP rope 10 (36 mm in this case), and the tension at the time of curing is 10
kg (a 10 kg weight was suspended at one end of the rope 10). The curing tension at the time of curing is important in terms of structural strength, and must be within the range obtained by the following calculation formula.
【００１７】Ｔ（ｇ）＝補強繊維Ｆの総重量（ｇ／ｍ）
×９０００×ｃ ｃ＝０．０２５〜０．００５ この値より硬化張力が大きいと前記コーナー部Ｒが扁平
になり、引張り強力が低下する結果となり、逆に小さい
とＦＲＰストランドＡの弛みが残り、伸びが大きくなっ
て実使用時には歪みが大きくなってしまう上に、直線部
の強力も低下する。T (g) = total weight of reinforcing fiber F (g / m)
× 9000 × cc = 0.025 to 0.005 If the curing tension is larger than this value, the corner R becomes flat and the tensile strength decreases, and if it is smaller, the FRP strand A remains slack, As the elongation increases, the distortion increases during actual use, and the strength of the linear portion also decreases.
【００１８】実施例２ 図示しないが、実施例１と同様にして、７本撚りのＦＲ
Ｐロープ１０を作成し、該ＦＲＰロープ１０のコーナー
部Ｒの半径が６０ｍｍ（ロープ外径の５倍）となる硬化
ジグ４０により曲げ加工を施し、また実施例１と同様の
張力（１０ｋｇ）をかけて硬化させることでせん断補強
筋２０を得た。Example 2 Although not shown, a seven-strand FR was used in the same manner as in Example 1.
A P rope 10 is formed, and a bending process is performed by a hardening jig 40 having a radius R of a corner portion R of the FRP rope 10 of 60 mm (five times the outer diameter of the rope), and a tension (10 kg) similar to that of the first embodiment is applied. Shearing reinforcement was performed to obtain a shear reinforcing bar 20.
【００１９】比較例１ 図示しないが、実施例１と同様にして、７本撚りのＦＲ
Ｐロープ１０を作成し、該ＦＲＰロープ１０のコーナー
部Ｒの半径が７２ｍｍ（ロープ外径の６倍）となる硬化
ジグ４０により曲げ加工を施し、また上記同様の張力
（１０ｋｇ）をかけて硬化させることでせん断補強筋２
０を得た。COMPARATIVE EXAMPLE 1 Although not shown, a seven-strand FR was used in the same manner as in Example 1.
The P-rope 10 is made, bent by a curing jig 40 having a radius R of a corner R of the FRP rope 10 of 72 mm (6 times the outer diameter of the rope), and cured by applying the same tension (10 kg) as described above. Shear reinforcement 2
0 was obtained.
【００２０】比較例２ 図示しないが、実施例１と同様にして、７本撚りのＦＲ
Ｐロープ１０を作成し、該ＦＲＰロープ１０のコーナー
部Ｒの半径が２４ｍｍ（ロープ外径の２倍）となる硬化
ジグ４０により曲げ加工を施し、また上記同様の張力
（１０ｋｇ）をかけて硬化させることでせん断補強筋２
０を得た。Comparative Example 2 Although not shown, a seven-stranded FR was used in the same manner as in Example 1.
A P-rope 10 is made, bent by a curing jig 40 having a radius of a corner R of the FRP rope 24 of 24 mm (twice the outer diameter of the rope), and cured by applying the same tension (10 kg) as described above. Shear reinforcement 2
0 was obtained.
【００２１】比較例３ 図示しないが、実施例１と同様にして、７本撚りのＦＲ
Ｐロープ１０を作成し、該ＦＲＰロープ１０のコーナー
部Ｒの半径が３６ｍｍ（ロープ外径の３倍）となる硬化
ジグ４０により曲げ加工を施し、また３０ｋｇ（ｃ＝
０．０５）の張力をかけて硬化させることでせん断補強
筋２０を得た。COMPARATIVE EXAMPLE 3 Although not shown, a seven-stranded FR was used in the same manner as in Example 1.
A P rope 10 is prepared, bent by a hardening jig 40 in which a radius of a corner portion R of the FRP rope 10 becomes 36 mm (three times the outer diameter of the rope), and 30 kg (c =
By applying a tension of 0.05) and curing, the shear reinforcement 20 was obtained.
【００２２】実施例３ 図示しないが、実施例１と同様にして、７本撚りのＦＲ
Ｐロープ１０を作成し、該ＦＲＰロープ１０のコーナー
部Ｒの半径が３６ｍｍ（ロープ外径の３倍）となる硬化
ジグ４０により曲げ加工を施し、また３ｋｇ（ｃ＝０．
００５）の張力をかけて硬化させることでせん断補強筋
２０を得た。Example 3 Although not shown, in the same manner as in Example 1, a seven-stranded FR was used.
The P-rope 10 is prepared, bent by a hardening jig 40 in which the radius of the corner R of the FRP rope 10 is 36 mm (three times the outer diameter of the rope), and 3 kg (c = 0.
By applying a tension of 005) and curing, the shear reinforcement 20 was obtained.
【００２３】実施例４ 図示しないが、実施例１と同様にして、７本撚りのＦＲ
Ｐロープ１０を作成し、該ＦＲＰロープ１０のコーナー
部Ｒの半径が３６ｍｍ（ロープ外径の３倍）となる硬化
ジグ４０により曲げ加工を施し、また１５ｋｇ（ｃ＝
０．０２５）の張力をかけて硬化させることでせん断補
強筋２０を得た。Example 4 Although not shown, a seven-stranded FR was used in the same manner as in Example 1.
A P rope 10 is prepared, bent by a hardening jig 40 in which a radius of a corner R of the FRP rope 10 is 36 mm (three times the outer diameter of the rope), and 15 kg (c = c).
By applying a tension of 0.025) and curing, the shear reinforcement 20 was obtained.
【００２４】比較例４ 図示しないが、実施例１と同様にして、７本撚りのＦＲ
Ｐロープ１０を作成し、該ＦＲＰロープ１０のコーナー
部Ｒの半径が３６ｍｍ（ロープ外径の３倍）となる硬化
ジグ４０により曲げ加工を施し、また１．５ｋｇ（ｃ＝
０．００２５）の張力をかけて硬化させてせん断補強筋
２０を得た。なお本実施例では、直線部の引張り試験で
は、ストランドの弛みのため、負荷がかかる（荷重が立
ち上がる）までに２〜３％の伸びが認められた。COMPARATIVE EXAMPLE 4 Although not shown, a seven-stranded FR was used in the same manner as in Example 1.
A P rope 10 is prepared, bent by a hardening jig 40 in which a radius of a corner portion R of the FRP rope 10 is 36 mm (three times the outer diameter of the rope), and 1.5 kg (c =
0.0025) to obtain a shear reinforcing bar 20. In this example, in the tensile test of the straight portion, elongation of 2 to 3% was observed before the load was applied (the load rose) due to the loosening of the strand.
【００２５】実施例５ 未硬化ＦＲＰストランドを８巻準備し、該未硬化ＦＲＰ
ストランドを用いて編網機により八つ打ちＦＲＰロープ
５０を作成した。八つ打ちＦＲＰロープ５０の構造を図
５に示す。八つ打ちＦＲＰロープ５０の作成に引き続
き、この未硬化状の八つ打ちＦＲＰロープ５０を使用し
て実施例２と同様に硬化ジグにより矩形螺旋状に硬化さ
せてせん断補強筋２０を形成した。硬化時の張力は１
１．５ｋｇ（ｃ＝０．０２２）とし実施例１と同様に引
張強力を評価した。Example 5 Eight uncured FRP strands were prepared, and the uncured FRP
Using a strand, an eight-strike FRP rope 50 was produced by a knitting machine. FIG. 5 shows the structure of the eight-stroke FRP rope 50. Subsequent to the production of the eight-stroke FRP rope 50, the unhardened eight-strand FRP rope 50 was cured in a rectangular spiral using a curing jig in the same manner as in Example 2 to form the shear reinforcement 20. The tension during curing is 1
The tensile strength was evaluated in the same manner as in Example 1 with 1.5 kg (c = 0.022).
【００２６】以上各実施例及び比較例において引き抜き
耐力測定試験を実施し、その結果を表１に示す。引き抜
き耐力として、コーナー部Ｒにおける引張り強度を図６
に示す試験装置６０により以下の方法にて測定を行っ
た。せん断補強筋２０のコーナー部Ｒをコンクリート基
底部Ｃ（圧縮強度４０Ｎ／ｍｍ２）内に埋設して引き抜
き耐力を主に担う付着部分を設定し、もう片端末を塩化
ビニールパイプＰ内の粘度質ＣＬ中に挿通させコンクリ
ート基底部Ｃとの付着防止を図りつつグラウト定着させ
るとともにその先端部の定着具６１とコンクリート基底
部Ｃとの間に油圧ジャッキ６２を設けて該定着具６１を
押し上げてロードセル６３によりコーナー部Ｒの引張り
強度を評価した。With respect to the above Examples and Comparative Examples, a pull-out resistance measurement test was performed, and the results are shown in Table 1. As the pullout strength, the tensile strength at the corner R is shown in FIG.
Was measured by the following method using a test device 60 shown in FIG. The corner portion R of the shear reinforcement 20 is embedded in the concrete base portion C (compression strength of 40 N / mm 2) to set an adhesion portion mainly responsible for pull-out strength, and the other end is connected to the viscous material CL in the vinyl chloride pipe P. The grout is fixed there while preventing adhesion to the concrete base portion C, and a hydraulic jack 62 is provided between the fixing device 61 at the tip and the concrete base portion C to push up the fixing device 61 to load cell 63. The tensile strength of the corner R was evaluated by the following.
【００２７】[0027]
【表１】 [Table 1]
【００２８】φ４−３．５未硬化状ＦＲＰストランドＡ
を７本撚り合わせた、もしくは８本編組みしたせん断補
強筋２０（実施例１、２、３、５等）は、コーナー部Ｒ
をＦＲＰロープ１０（或いは八つ打ちＦＲＰロープ５
０）外径の３倍もしくは５倍（３６Ｒ、６０Ｒ）として
硬化させた場合に、係るせん断補強筋２０におけるコー
ナー部Ｒの引張強力は約５ｔｏｎと実用上十分な（カー
ボンの引張強力から計算した理論引張強力の３０％程
度）強力が得られることがわかった。一方、その他の場
合（ＦＲＰロープ１０及び八つ打ちＦＲＰロープ５０の
コーナー部Ｒの半径が該ロープ１０外径の３倍〜５倍の
範囲外）においては、十分な引張強力が得られずせん断
補強筋２０として必要な性能が確保されないこととなっ
た。Φ4-3.5 uncured FRP strand A
7 or 8 braided shear reinforcements 20 (Examples 1, 2, 3, 5 etc.)
To the FRP rope 10 (or 8 hit FRP rope 5
0) When hardened to three or five times the outer diameter (36R, 60R), the tensile strength of the corner R of the shear reinforcement 20 is about 5 tons, which is practically sufficient (calculated from the tensile strength of carbon). (About 30% of the theoretical tensile strength). On the other hand, in other cases (where the radius of the corner R of the FRP rope 10 and the eight-strand FRP rope 50 is out of the range of 3 to 5 times the outer diameter of the rope 10), sufficient tensile strength cannot be obtained, and shearing is not performed. The required performance as the reinforcing bar 20 was not secured.
【００２９】[0029]
【発明の効果】以上詳細に説明したように、本発明のせ
ん断補強用熱可塑性樹脂被覆ＦＲＰ筋は、熱硬化性樹脂
が含浸され、外周面が熱可塑性樹脂で被覆された補強繊
維束であるＦＲＰストランドを用いたせん断補強用熱可
塑性樹脂被覆ＦＲＰ筋であって、少なくとも一本の前記
ＦＲＰストランドを芯ストランドとし、その外周に６本
の外周ストランドがスパイラル状に撚り合わされたＦＲ
Ｐロープ、もしくはＦＲＰストランド８本を編組みして
八つ打ちロープ状にした八つ打ちＦＲＰロープを、コー
ナー部半径が該ＦＲＰロープもしくは八つ打ちＦＲＰロ
ープ外径の３倍〜５倍となる矩形螺旋状に成形してなる
ことを特徴とするものである。更に、本発明のせん断補
強用熱硬化性樹脂被覆ＦＲＰ筋は、前記ＦＲＰロープ或
いは八つ打ちＦＲＰロープを、硬化時張力係数について
０．００５以上０．０２５以下の範囲内と設定して硬化
させてなるものである。As described above in detail, the thermoplastic resin-coated FRP streak for shear reinforcement of the present invention is a reinforcing fiber bundle impregnated with a thermosetting resin and having an outer peripheral surface coated with the thermoplastic resin. A thermoplastic resin-coated FRP streak for shear reinforcement using FRP strands, wherein at least one of the FRP strands is a core strand, and six outer strands are spirally twisted around its outer periphery.
An eight-stroke FRP rope formed by braiding P rope or eight FRP strands to form an eight-stroke rope has a corner radius that is three to five times the outer diameter of the FRP rope or the eight-strand FRP rope. It is characterized by being formed into a rectangular spiral. Further, the thermosetting resin-coated FRP streak for shear reinforcement of the present invention sets and cures the FRP rope or the eight-strand FRP rope with a tension coefficient at the time of curing within a range of 0.005 to 0.025. It is.
【００３０】したがって、本発明のせん断補強用熱可塑
性樹脂被覆ＦＲＰ筋であれば、様々な条件において求め
られる補強筋形状及び寸法に対応して補強筋としての性
能を柔軟に発揮することが可能で、従来より製造工程も
縮減可能となったから生産性にも優れる。また、構成素
材の有する物性により高い引張り強度等を備えて構造物
を確実に補強する一方で、該補強筋の切断はシールドマ
シーンの備えるカッタービット等によれば比較的容易で
あり、例えば地下工事等で汎用されるＮＯＭＳＴ工法に
おける発進・到達立坑の隔壁付近でのせん断補強筋とし
て適している。Therefore, the thermoplastic resin-coated FRP rebar for shear reinforcement of the present invention can flexibly exhibit performance as a rebar according to the rebar shape and dimensions required under various conditions. In addition, since the manufacturing process can be reduced, the productivity is excellent. Moreover, while the structure is reliably reinforced by providing high tensile strength and the like due to the physical properties of the constituent materials, cutting of the reinforcing bars is relatively easy according to the cutter bit or the like provided in the shield machine. It is suitable as a shear reinforcement near the bulkhead of the starting and arriving shaft in the NOMST method widely used in the above.
【００３１】更に、本発明の補強筋は全体として比重が
約１．４前後で一般の鋼材の約１／５と非常に軽く、取
り扱い性に格段に優れる上に、補強筋を覆う熱可塑性樹
脂の被覆材が保護膜となって、劣悪な腐食性環境等にお
いても耐候性、耐腐食性、耐アルカリ性に優れ補強筋と
しての役務を完遂しえるのである。このため、通常の鉄
製補強筋を適用すればほぼ確実に問題が生じるであろ
う、かぶりの浅いコンクリート補強筋としての使用や、
海岸などの腐食性環境下での使用にも全く問題がない。Furthermore, the reinforcing bar of the present invention has a specific gravity of about 1.4 as a whole and is about 1/5 that of a general steel material, which is very light, is extremely excellent in handleability, and has a thermoplastic resin covering the reinforcing bar. The coating material serves as a protective film, and has excellent weather resistance, corrosion resistance, and alkali resistance even in a poor corrosive environment or the like, and can complete its service as a reinforcing bar. For this reason, the use of ordinary steel reinforcement will almost certainly cause problems, such as the use of concrete reinforcement with shallow coverage,
There is no problem for use in corrosive environments such as coasts.
【図１】本発明のせん断補強用熱可塑性樹脂被覆ＦＲＰ
筋を構成するＦＲＰロープを示し、（ａ）はその断面
図、（ｂ）は同側面図である。FIG. 1 is a thermoplastic resin-coated FRP for shear reinforcement of the present invention.
The FRP rope which comprises a muscle is shown, (a) is sectional drawing, (b) is the same side view.
【図２】図１におけるＦＲＰロープを用いた、コーナー
部半径が該ＦＲＰロープ外径の３倍となる矩形螺旋状の
せん断補強用熱可塑性樹脂被覆ＦＲＰ筋を示す説明図で
ある。FIG. 2 is an explanatory view showing a rectangular spiral spiral reinforcing thermoplastic resin-coated FRP streak having a corner radius three times the outer diameter of the FRP rope, using the FRP rope in FIG. 1;
【図３】図２に示すせん断補強用ＦＲＰ筋におけるコー
ナー部拡大図である。FIG. 3 is an enlarged view of a corner portion of the shear reinforcing FRP bar shown in FIG. 2;
【図４】本発明のせん断補強用熱可塑性樹脂被覆ＦＲＰ
筋を構成する未硬化状ＦＲＰロープを硬化させる硬化ジ
グを示す説明図である。FIG. 4 is a thermoplastic resin-coated FRP for shear reinforcement of the present invention.
It is explanatory drawing which shows the hardening jig which hardens the unhardened FRP rope which comprises a muscle.
【図５】実施例５における８本編組みした八つ打ちＦＲ
Ｐロープを示し、（ａ）はその側面図であり、（ｂ）は
同断面図である。FIG. 5 is an eight-strand FR with eight braids according to the fifth embodiment.
Fig. 3 shows a P rope, (a) is a side view thereof, and (b) is a sectional view thereof.
【図６】引き抜き耐力測定試験を実施する試験装置概要
を示す説明図であるFIG. 6 is an explanatory view showing an outline of a test apparatus for performing a pullout strength measurement test.
１０ ＦＲＰロープ １１ 芯ストランド １２ 外周ストランド １３ 熱硬化性樹脂 １４ 熱可塑性樹脂 ２０ せん断補強用熱可塑性樹脂被覆ＦＲＰ筋（せん断
補強筋） ５０ 八つ打ちＦＲＰロープ Ｆ 補強繊維（補強繊維束） Ａ ＦＲＰストランド Ｒ コーナー部DESCRIPTION OF SYMBOLS 10 FRP rope 11 Core strand 12 Peripheral strand 13 Thermosetting resin 14 Thermoplastic resin 20 Thermoplastic resin-coated FRP rebar for shear reinforcement (shear reinforcement) 50 Eight-strike FRP rope F Reinforcing fiber (reinforcing fiber bundle) A FRP strand R corner
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２９Ｋ 105:08 Ｂ２９Ｋ 105:08 (72)発明者 小野寺 章夫 東京都中央区東日本橋１−１−７ 宇部日 東化成株式会社内 Ｆターム(参考） 2E164 AA05 AA11 CA14 4F072 AA04 AA07 AA08 AB10 AD38 AD44 AG06 AG14 AH31 AH51 AK16 AK17 AL01 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (Reference) B29K 105: 08 B29K 105: 08 (72) Inventor Akio Onodera 1-1-7 Higashi-Nihonbashi, Chuo-ku, Tokyo Ube Nitto Kasei F term (for reference) 2E164 AA05 AA11 CA14 4F072 AA04 AA07 AA08 AB10 AD38 AD44 AG06 AG14 AH31 AH51 AK16 AK17 AL01
Claims (3)
塑性樹脂で被覆された補強繊維束であるＦＲＰストラン
ドを用いたせん断補強用熱可塑性樹脂被覆ＦＲＰ筋であ
って、 少なくとも一本の前記ＦＲＰストランドを芯ストランド
とし、その外周に６本の外周ストランドがスパイラル状
に撚り合わされたＦＲＰロープを、コーナー部半径が該
ＦＲＰロープ外径の３倍〜５倍となる矩形螺旋状に成形
してなることを特徴とするせん断補強用熱硬化性樹脂被
覆ＦＲＰ筋。1. A thermoplastic resin-coated FRP streak for shear reinforcement using an FRP strand, which is a reinforcing fiber bundle impregnated with a thermosetting resin and having an outer peripheral surface coated with a thermoplastic resin, comprising at least one strand. The FRP strand is used as a core strand, and an FRP rope in which six outer strands are twisted in a spiral shape around the outer periphery thereof is formed into a rectangular spiral shape having a corner portion radius of 3 to 5 times the outer diameter of the FRP rope. A thermosetting resin-coated FRP bar for shear reinforcement characterized by comprising:
塑性樹脂で被覆された補強繊維束であるＦＲＰストラン
ドを用いたせん断補強用熱可塑性樹脂被覆ＦＲＰ筋であ
って、 ８本の前記ＦＲＰストランドを八つ打ちロープ状に編組
みした八つ打ちＦＲＰロープを、コーナー部半径が該八
つ打ちＦＲＰロープ外径の３倍〜５倍となる矩形螺旋状
に成形してなることを特徴とするせん断補強用熱硬化性
樹脂被覆ＦＲＰ筋。2. A thermoplastic resin-coated FRP streak for shear reinforcement using an FRP strand which is a reinforcing fiber bundle impregnated with a thermosetting resin and having an outer peripheral surface coated with a thermoplastic resin, wherein: An eight-strand FRP rope obtained by braiding an FRP strand into an eight-strand rope is formed into a rectangular spiral shape having a corner radius of three to five times the outer diameter of the eight-strand FRP rope. Thermosetting resin-coated FRP streaks for shear reinforcement.
ロープを、硬化時張力(g)／（補強繊維の総重量(g/m)×
９０００）により定義される硬化時張力係数が０．００
５以上０．０２５以下であり、かつ、矩形螺旋状に成形
してなることを特徴とする請求項１または２に記載のせ
ん断補強用熱硬化性樹脂被覆ＦＲＰ筋。3. The FRP rope or the eight-stroke FRP.
The rope is cured by tension (g) / (total weight of reinforcing fiber (g / m) x
9000) is 0.00.
The thermosetting resin-coated FRP streak for shear reinforcement according to claim 1 or 2, which is 5 or more and 0.025 or less and is formed in a rectangular spiral shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33192199A JP4336432B2 (en) | 1999-11-22 | 1999-11-22 | Production method of thermoplastic resin-coated FRP bar for shear reinforcement and thermoplastic resin-coated FRP bar for shear reinforcement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33192199A JP4336432B2 (en) | 1999-11-22 | 1999-11-22 | Production method of thermoplastic resin-coated FRP bar for shear reinforcement and thermoplastic resin-coated FRP bar for shear reinforcement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001150433A true JP2001150433A (en) | 2001-06-05 |
| JP4336432B2 JP4336432B2 (en) | 2009-09-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010528908A (en) * | 2007-06-12 | 2010-08-26 | ヘクセル ランフォルセマン | Method for producing a composite material in which at least one twisted yarn is arranged |
| KR101151395B1 (en) * | 2009-09-24 | 2012-06-08 | 한국복합섬유 주식회사 | High strength reinforced for concrete structure |
| JP2014108898A (en) * | 2012-11-30 | 2014-06-12 | Ube Exsymo Co Ltd | Composite frp-made short linear material for cement reinforcement and method for manufacturing the same |
| KR101764693B1 (en) | 2015-07-15 | 2017-08-07 | 한국건설기술연구원 | Manufacturing Method and Apparatus of FRP Bar |
| JP2023006204A (en) * | 2021-06-30 | 2023-01-18 | 東京製綱株式会社 | Concrete reinforcement bar with irregularity |
-
1999
- 1999-11-22 JP JP33192199A patent/JP4336432B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010528908A (en) * | 2007-06-12 | 2010-08-26 | ヘクセル ランフォルセマン | Method for producing a composite material in which at least one twisted yarn is arranged |
| KR101151395B1 (en) * | 2009-09-24 | 2012-06-08 | 한국복합섬유 주식회사 | High strength reinforced for concrete structure |
| JP2014108898A (en) * | 2012-11-30 | 2014-06-12 | Ube Exsymo Co Ltd | Composite frp-made short linear material for cement reinforcement and method for manufacturing the same |
| KR101764693B1 (en) | 2015-07-15 | 2017-08-07 | 한국건설기술연구원 | Manufacturing Method and Apparatus of FRP Bar |
| JP2023006204A (en) * | 2021-06-30 | 2023-01-18 | 東京製綱株式会社 | Concrete reinforcement bar with irregularity |
| JP7335924B2 (en) | 2021-06-30 | 2023-08-30 | 東京製綱株式会社 | Concrete reinforcing bars with unevenness |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4336432B2 (en) | 2009-09-30 |
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