JP2010174423A - Inspectable polyethylene-coated epoxy strand - Google Patents

Inspectable polyethylene-coated epoxy strand Download PDF

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JP2010174423A
JP2010174423A JP2009020919A JP2009020919A JP2010174423A JP 2010174423 A JP2010174423 A JP 2010174423A JP 2009020919 A JP2009020919 A JP 2009020919A JP 2009020919 A JP2009020919 A JP 2009020919A JP 2010174423 A JP2010174423 A JP 2010174423A
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Prior art keywords
resin
bridge
polyethylene
steel
strand
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Masashi Oikawa
雅司 及川
Masato Yamada
眞人 山田
Takashi Ichiki
隆志 市来
Motoyasu Nishino
元庸 西野
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Sumitomo SEI Steel Wire Corp
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Sumitomo SEI Steel Wire Corp
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Priority to JP2009020919A priority Critical patent/JP2010174423A/en
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    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
    • D07B1/145—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising elements for indicating or detecting the rope or cable status
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2042—Strands characterised by a coating
    • D07B2201/2044—Strands characterised by a coating comprising polymers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2042—Strands characterised by a coating
    • D07B2201/2045—Strands characterised by a coating comprising multiple layers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2083—Jackets or coverings
    • D07B2201/2087—Jackets or coverings being of the coated type
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2083—Jackets or coverings
    • D07B2201/2088—Jackets or coverings having multiple layers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2083—Jackets or coverings
    • D07B2201/2092—Jackets or coverings characterised by the materials used
    • D07B2201/2093—Jackets or coverings characterised by the materials used being translucent

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  • Ropes Or Cables (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an epoxy strand in which PC-steel-wire strands used as an external cable for a bridge can be easily inspected. <P>SOLUTION: In the external cable 20 for the bridge, in which a plurality of PC-steel-twisted strands 10 coated with a first resin 12 and a second resin 13 are bundled, the second resin 13 of at least one strand out of the plurality of PC-steel-twisted strands 10 is transparent. Preferably, the first resin 12 is an epoxy resin and the second resin 13 is a polyethylene resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、橋梁などのプレストレストコンクリート構造物に使用されるＰＣ鋼より線およびこのＰＣ鋼より線を用いた外ケーブルに関する。   The present invention relates to a PC steel strand used for a prestressed concrete structure such as a bridge, and an outer cable using the PC steel strand.

橋梁などのコンクリート構造物に使用されるプレストレストコンクリート（以下ＰＣと称する）箱桁の軽量化の要求に対し、箱桁部材の薄肉化をはかるために、プレストレス導入用の緊張材をコンクリート部材肉厚断面の外側、すなわち、箱桁断面の内部の空隙に配設する「外ケーブル構造」が採用されている。この外ケーブル構造の採用で、箱桁自体が軽量化されたのに加え、材料費の軽減、施工時の作業量の減少などＰＣケーブルの維持管理や補修が容易となる効果がもたらされた。また、上部工の軽量化はそれを支える下部工（橋脚や基礎）のコスト縮減にもつながった。   Prestressed concrete (hereinafter referred to as PC) used for concrete structures such as bridges. In order to reduce the thickness of box girders, the tension material for introducing prestress is used to reduce the thickness of the box girders. An “outer cable structure” is employed that is disposed outside the thick section, that is, in the gap inside the box girder section. The adoption of this outer cable structure has the effect of facilitating the maintenance and repair of PC cables, such as reducing the cost of materials and reducing the amount of work during construction, in addition to reducing the weight of the box girder itself. . In addition, the weight reduction of the superstructure led to the cost reduction of the substructure (bridge pier and foundation) that supported it.

この外ケーブル構造においては、プレストレスを導入するため、ＰＣ鋼より線を複数本束ねて構成される外ケーブルが緊張材として使用されている。例えば、特許文献１には、７本撚りの裸のＰＣ鋼より線の表面にエポキシ樹脂を被覆し、更にその表面にポリエチレンを被覆してなるポリエチレン被覆エポキシストランドを１９本束ねてなる外ケーブルが開示されている。このポリエチレン被覆エポキシストランドは、エポキシ樹脂及びポリエチレンによって２重に被覆されているので防食性に優れており、塩害対策橋など特に高耐食性を要求される用途におおいて多く用いられている。   In this outer cable structure, in order to introduce prestress, an outer cable configured by bundling a plurality of PC steel wires is used as a tension material. For example, Patent Document 1 discloses an external cable in which 19 strands of polyethylene-coated epoxy strands are formed by coating a surface of a 7-strand bare PC strand with an epoxy resin and further coating the surface with polyethylene. It is disclosed. Since this polyethylene-coated epoxy strand is double-coated with an epoxy resin and polyethylene, it has excellent anticorrosion properties and is often used in applications requiring high corrosion resistance, such as a salt damage bridge.

特開２０００−０９６４７０号公報JP 2000-096470 A

上記したように、ポリエチレン被覆エポキシストランドは高い耐久性を有しているが、より万全を期すためには、定期的に保全状態を点検することが望ましい。しかしながら、従来のポリエチレン被覆エポキシストランドは、耐候性及び経済性の観点から黒色のポリエチレンで表面が被覆されているため、内部のＰＣ鋼より線の状態を目視にて点検することはできなかった。   As described above, the polyethylene-coated epoxy strand has high durability, but it is desirable to periodically check the maintenance state in order to ensure completeness. However, since the surface of the conventional polyethylene-coated epoxy strand is coated with black polyethylene from the viewpoint of weather resistance and economy, the state of the strand of the internal PC steel cannot be visually inspected.

本発明は、上記課題を解決するためになされたものであり、橋梁用外ケーブルに使用されているＰＣ鋼より線の点検を容易に行うことが可能なエポキシストランドを提供することを目的としている。   The present invention has been made to solve the above-described problems, and an object thereof is to provide an epoxy strand capable of easily inspecting a strand of PC steel used for an external cable for a bridge. .

上記目的を達成するため、本発明が提案する橋梁用外ケーブルは、第１の樹脂及び第２の樹脂によって被覆されたＰＣ鋼より線を複数本束ねて構成されており、これら複数本のＰＣ鋼より線のうちの少なくとも１本は第２の樹脂が透明であることを特徴としている。上記本発明の橋梁用外ケーブルにおいては、第１の樹脂がエポキシであり、第２の樹脂がポリエチレンであることが好ましい。   In order to achieve the above object, the bridge outer cable proposed by the present invention is configured by bundling a plurality of strands of PC steel coated with a first resin and a second resin. At least one of the steel strands is characterized in that the second resin is transparent. In the bridge external cable of the present invention, it is preferable that the first resin is epoxy and the second resin is polyethylene.

本発明によれば、複数本のＰＣ鋼より線のうちの少なくとも１本は第２の樹脂が透明であるので、エポキシ樹脂等の第１の樹脂によって被覆されているＰＣ鋼より線の経年劣化の有無を目視によって確実に識別することができるので、橋梁用外ケーブルの点検を容易に行うことができる。   According to the present invention, since the second resin is transparent in at least one of the plurality of PC steel strands, the aging of the PC strand covered with the first resin such as epoxy resin is aged. Since the presence or absence of this can be reliably identified visually, it is possible to easily inspect the bridge outer cable.

本発明の橋梁用外ケーブルを構成するＰＣ鋼より線の一具体例を示す断面図である。It is sectional drawing which shows one specific example of the PC steel strand which comprises the outer cable for bridges of this invention. 本発明の橋梁用外ケーブルの一具体例を示す断面図である。It is sectional drawing which shows one specific example of the outer cable for bridges of this invention. 本発明の橋梁用外ケーブルが橋梁に用いられている例を示す模式図である。It is a schematic diagram which shows the example in which the outer cable for bridges of this invention is used for the bridge. 図３に示す偏向部の部分断面図である。It is a fragmentary sectional view of the deflection | deviation part shown in FIG. 図４のＢ−Ｂ部分で橋梁用外ケーブルを切断したときの断面図である。It is sectional drawing when the outer cable for bridges is cut | disconnected in the BB part of FIG.

以下、本発明の橋梁用外ケーブルの一具体例を図面を参照しながら説明する。図１に示すように、橋梁用外ケーブルを構成するＰＣ鋼より線１０は、複数本の素線１１を撚り合わせたものの表面に第１の樹脂１２及び第２の樹脂１３が被覆されている。具体的には、外径１５.２ｍｍの７本より線の表面に、第１の樹脂１２として厚さ０.６ｍｍのエポキシ樹脂が被覆されている。エポキシ樹脂による被覆は、好適には粉体塗装によって行うことができる。   Hereinafter, a specific example of the bridge outer cable of the present invention will be described with reference to the drawings. As shown in FIG. 1, the PC steel stranded wire 10 constituting the bridge outer cable has a first resin 12 and a second resin 13 coated on the surface of a plurality of strands 11 twisted together. . Specifically, the surface of seven strands having an outer diameter of 15.2 mm is coated with an epoxy resin having a thickness of 0.6 mm as the first resin 12. The coating with the epoxy resin can be preferably performed by powder coating.

エポキシ樹脂で被覆することによって高い防食性を得ることができるが、更に防食性を高め且つ施工時に生じやすい損傷を防止するため、エポキシ樹脂の表面に、更に第２の樹脂１３として厚さ１.２５ｍｍのポリエチレンが被覆されている。このポリエチレンによる被覆は、好適には押し出し加工によって行うことができる。このようにして、耐久性が高められた外径１８.９ｍｍのＰＣ鋼より線１０が得られる。   High anticorrosion properties can be obtained by coating with an epoxy resin, but in order to further enhance the anticorrosion properties and prevent damage that is likely to occur during construction, a thickness of 1. 25 mm polyethylene is coated. The coating with polyethylene can be preferably performed by extrusion. In this way, the wire 10 is obtained from PC steel having an outer diameter of 18.9 mm with improved durability.

上記ＰＣ鋼より線１０を複数本束ねることによって橋梁用外ケーブル２０が構成される。例えば、図２には１９本のＰＣ鋼より線１０を束ねた橋梁用外ケーブル２０が示されている。尚、束ねられる本数は１９本に限定するものではなく、２７本や３７本のＰＣ鋼より線１０が束ねられることもある。   The bridge outer cable 20 is configured by bundling a plurality of the strands 10 of the PC steel. For example, FIG. 2 shows an external cable 20 for a bridge in which 19 PC steel strands 10 are bundled. The number of bundles is not limited to 19, and the wire 10 may be bundled from 27 or 37 PC steels.

本発明においては、上記橋梁用外ケーブル２０を構成する複数本のＰＣ鋼より線１０のうち、少なくとも１本は第２の樹脂１３が透明であることを特徴としている。例えば、第２の樹脂１３としてポリエチレンを使用する場合は、少なくとも１本のＰＣ鋼より線には透明なポリエチレンが使用されており、残りのＰＣ鋼より線には、カーボンブラック等を添加して黒色にしたポリエチレンが使用されている。   In the present invention, at least one of the plurality of PC steel stranded wires 10 constituting the bridge outer cable 20 is characterized in that the second resin 13 is transparent. For example, when polyethylene is used as the second resin 13, transparent polyethylene is used for at least one PC steel wire, and carbon black or the like is added to the remaining PC steel wire. Blackened polyethylene is used.

橋梁用外ケーブル２０を構成する各ＰＣ鋼より線１０は、ほぼ同程度に経年劣化すると考えることができるので、第２の樹脂１３を透明にしたＰＣ鋼より線のみを点検することによって、橋梁用外ケーブル２０の保全状態を確認することができる。よって、煩雑でコストのかかる非破壊検査等を行うことなく信頼性の高い点検を簡易に行うことができる。   Since the PC steel strands 10 constituting the bridge outer cable 20 can be considered to deteriorate over time to approximately the same level, the inspection can be performed only by checking only the PC strands with the second resin 13 made transparent. The maintenance state of the external cable 20 can be confirmed. Therefore, a highly reliable inspection can be easily performed without performing a complicated and costly nondestructive inspection.

橋梁用外ケーブル２０を構成する複数本のＰＣ鋼より線１０の全ての第２の樹脂１３を透明なものにしても良いが、黒色は一般に耐候性の点において優れており且つ経済的でもあるので、１〜数本だけを透明にすることが好ましい。尚、複数本を透明にする場合は、束ねられたときに透明にしたもの同士が適度に分散して配置されるのが好ましい。   Although all the second resins 13 of the plurality of PC steel strands 10 constituting the bridge outer cable 20 may be transparent, black is generally excellent in weather resistance and economical. Therefore, it is preferable to make only one to several transparent. In addition, when making several transparent, it is preferable that what was made transparent when bundled is disperse | distributed moderately.

また、図２の例えば位置Ａのように、ＰＣ鋼より線１０の束の一番外側に透明にしたものが来るようにするのが好ましい。これにより、施工時及び施工後の定期点検をより容易に行うことができる。尚、図２においては、位置ＡはＰＣ鋼より線の束の最下部に位置しているが、かかる位置に限定されるものではなく、束の最上部や横に位置しても良い。   Moreover, it is preferable to make the transparent thing come to the outermost side of the bundle | flux of the strand 10 of PC steel like the position A of FIG. Thereby, the periodic inspection at the time of construction and after construction can be performed more easily. In FIG. 2, the position A is located at the bottom of the bundle of strands of PC steel, but is not limited to this position, and may be located at the top or side of the bundle.

図３には、上記橋梁用外ケーブル２０を橋梁１に使用したときの一例が示されている。図３に示されるように、橋梁用外ケーブル２０は、橋梁１の箱桁の両端部に設けられた定着部２によって緊張力が加えられており、これにより、コンクリート構造からなる橋梁１の耐荷力の維持、及びひび割れなどによる破壊の防止が行われている。   FIG. 3 shows an example when the bridge outer cable 20 is used for the bridge 1. As shown in FIG. 3, the bridge outer cable 20 is tensioned by the fixing portions 2 provided at both ends of the box girder of the bridge 1, whereby the load resistance of the bridge 1 made of a concrete structure is applied. The maintenance of force and the prevention of destruction due to cracks are carried out.

橋梁１の箱桁内部の中央部には複数の偏向部３が設けられている。この偏向部３で橋梁用外ケーブル２０が偏向せしめられている。図４は図３の偏向部３を拡大した部分断面図である。この図４から分るように、偏向部３には橋梁用外ケーブル２０が挿通されるデビエータ管４が設けられている。デビエータ管４内には、更に、摩擦抵抗を少なくしてプレストレス導入時にスムーズに橋梁用外ケーブル２０が移動可能となるように、ポリエチレン管５が設けられている。   A plurality of deflecting portions 3 are provided in the central portion inside the box girder of the bridge 1. The deflection cable 3 deflects the bridge outer cable 20. 4 is an enlarged partial cross-sectional view of the deflection unit 3 of FIG. As can be seen from FIG. 4, the deflector 3 is provided with a deviator tube 4 through which the bridge outer cable 20 is inserted. A polyethylene pipe 5 is further provided in the deviator pipe 4 to reduce the frictional resistance so that the bridge outer cable 20 can be moved smoothly when prestress is introduced.

この偏向部３では、橋梁用外ケーブル２０に上向きの力が働くので、図５に示すように、橋梁用外ケーブル２０は若干横に広がったような形状となる。この場合においても、図２に示す位置Ａは束になっている複数のＰＣ鋼より線１０の一番外側に位置しており、容易に点検することができる。   In this deflecting portion 3, an upward force acts on the bridge outer cable 20, so that the bridge outer cable 20 has a shape that slightly spreads sideways as shown in FIG. 5. Even in this case, the position A shown in FIG. 2 is located on the outermost side of the bundled PC steel wires 10 and can be easily inspected.

以上、本発明の橋梁用外ケーブルの一具体例について説明したが、本発明は係る一具体例に限定されるものではなく、本発明の主旨から逸脱しない範囲内で種々の実施態様が可能であることはいうまでもない。すなわち、本発明は、その技術的範囲が特許請求の範囲及びその均等物に及ぶことを企図している。   The specific example of the bridge outer cable according to the present invention has been described above. However, the present invention is not limited to the specific example, and various embodiments are possible without departing from the gist of the present invention. Needless to say. That is, the present invention contemplates that the technical scope extends to the claims and their equivalents.

１ 橋梁
２ 定着部
３ 偏向部
４ デビエータ管
５ ポリエチレン管
１０ ＰＣ鋼より線
１１ 素線
１２ 第１の樹脂
１３ 第２の樹脂
２０ 橋梁用外ケーブル DESCRIPTION OF SYMBOLS 1 Bridge 2 Fixing part 3 Deflection part 4 Deviator pipe 5 Polyethylene pipe 10 PC steel strand 11 Strand 12 First resin 13 Second resin 20 Outside cable for bridge

Claims (2)

第１の樹脂及び第２の樹脂によって被覆されたＰＣ鋼より線を複数本束ねてなる橋梁用外ケーブルにおいて、前記複数本のＰＣ鋼より線のうちの少なくとも１本は前記第２の樹脂が透明であることを特徴とする橋梁用外ケーブル。   In an outer cable for a bridge formed by bundling a plurality of PC steel wires covered with a first resin and a second resin, at least one of the plurality of PC steel wires is made of the second resin. An outer cable for bridges that is transparent. 前記第１の樹脂がエポキシであり、前記第２の樹脂がポリエチレンであることを特徴とする、請求項１に記載の橋梁用外ケーブル。   The bridge outer cable according to claim 1, wherein the first resin is epoxy and the second resin is polyethylene.
JP2009020919A 2009-01-30 2009-01-30 Inspectable polyethylene-coated epoxy strand Pending JP2010174423A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2519960A (en) * 2013-11-01 2015-05-13 Bridon Ltd Sheathed cable
JP2016125330A (en) * 2015-01-08 2016-07-11 住友電工スチールワイヤー株式会社 Coated prestressing steel strand

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000096470A (en) * 1998-09-16 2000-04-04 Sumitomo Electric Ind Ltd Prestressed concrete steel strand wire and cable excellent in fatigue
JP2000291205A (en) * 1999-04-01 2000-10-17 Nippon Mentekku Kk Protection pipe for outer cable
JP2001032211A (en) * 1999-05-17 2001-02-06 Anderson Technology Kk Box girder structure of bridge having external cable, and building method of box girder
JP2002115370A (en) * 2000-10-10 2002-04-19 Sumitomo Electric Ind Ltd Structure of coupler for connecting pc steel material
JP2003193622A (en) * 2001-12-25 2003-07-09 Sumitomo Electric Ind Ltd Resin coated anti-corrosive pc steel member
JP2003268717A (en) * 2002-03-16 2003-09-25 Hiromu Rokusha Outer cable and box beam structure of bridge having the outer cable disposed therein

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000096470A (en) * 1998-09-16 2000-04-04 Sumitomo Electric Ind Ltd Prestressed concrete steel strand wire and cable excellent in fatigue
JP2000291205A (en) * 1999-04-01 2000-10-17 Nippon Mentekku Kk Protection pipe for outer cable
JP2001032211A (en) * 1999-05-17 2001-02-06 Anderson Technology Kk Box girder structure of bridge having external cable, and building method of box girder
JP2002115370A (en) * 2000-10-10 2002-04-19 Sumitomo Electric Ind Ltd Structure of coupler for connecting pc steel material
JP2003193622A (en) * 2001-12-25 2003-07-09 Sumitomo Electric Ind Ltd Resin coated anti-corrosive pc steel member
JP2003268717A (en) * 2002-03-16 2003-09-25 Hiromu Rokusha Outer cable and box beam structure of bridge having the outer cable disposed therein

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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WO2016111290A1 (en) * 2015-01-08 2016-07-14 住友電工スチールワイヤー株式会社 Covered pc steel twisted wire
EP3243972A4 (en) * 2015-01-08 2018-10-31 Sumitomo (SEI) Steel Wire Corp. Covered pc steel twisted wire
EP3486394A1 (en) * 2015-01-08 2019-05-22 Sumitomo (SEI) Steel Wire Corp. Coated pc steel stranded cable
US10815664B2 (en) 2015-01-08 2020-10-27 Sumitomo Electric Industries, Ltd. Coated PC steel stranded cable

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