WO2013065625A1 - Self-supporting optical fiber cable and mid-span access method - Google Patents

Self-supporting optical fiber cable and mid-span access method Download PDF

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Publication number
WO2013065625A1
WO2013065625A1 PCT/JP2012/077850 JP2012077850W WO2013065625A1 WO 2013065625 A1 WO2013065625 A1 WO 2013065625A1 JP 2012077850 W JP2012077850 W JP 2012077850W WO 2013065625 A1 WO2013065625 A1 WO 2013065625A1
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Prior art keywords
cable
optical fiber
sheath
self
slot
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PCT/JP2012/077850
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French (fr)
Japanese (ja)
Inventor
由人 工藤
岡田　直樹
山中　正義
富川　浩二
大樹 竹田
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株式会社フジクラ
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Publication of WO2013065625A1 publication Critical patent/WO2013065625A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4431—Protective covering with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • G02B6/4433—Double reinforcement laying in straight line with optical transmission element

Definitions

  • the present invention relates to a self-supporting optical fiber cable having a slot core with a C-shaped cross section, and an intermediate post branching method thereof.
  • a self-supporting optical fiber cable described in Patent Document 1 has a slot having a circular cross section in which a plurality of slot grooves are provided on a peripheral surface, and a plurality of optical fiber ribbons are stacked in the slot groove.
  • a cable part in which a core is covered with a sheath is connected to a support line part via a neck part.
  • the neck portion is cut to separate the cable portion from the support wire portion, and the cable portion sheath is cut along the longitudinal direction of the cable with a cutter or the like.
  • the optical fiber core wire is taken out from the exposed slot groove of the slot core and connected to the drop cable.
  • an object of the present invention is to provide a self-supporting optical fiber cable that can easily perform an intermediate post-branching operation and an intermediate post-branching method.
  • a cable portion in which a slot core having a C-shaped cross section having a slot groove in which an optical fiber is accommodated is covered with a sheath, and a support line provided along the longitudinal direction of the cable portion
  • a self-supporting optical fiber cable having a support line portion covered with a cable and a neck portion that integrally connects the cable portion and the support line portion, on a neutral line connecting the center of the cable portion and the center of the support line portion
  • Two strength members are provided in the longitudinal direction of the cable, one strength member is embedded in the slot core corresponding to the bottom of the slot groove, and the other strength member is the cable corresponding to the opening of the slot groove. It is characterized by being embedded in the sheath of the part.
  • the second invention is characterized in that, in the first invention, the opening of the slot groove is provided toward the support line portion or toward the opposite side to the support line portion.
  • the sheath at the time of intermediate rear branching is located on a line passing through the center of the cable part and perpendicularly intersecting the neutral line, and on the sheath surface of the cable part.
  • a feature is that a removal mark is provided.
  • the fourth invention is characterized in that, in the third invention, a tear string for tearing the sheath of the cable portion is embedded in a portion corresponding to the mark for removing the sheath.
  • a cable portion in which a slot core having a C-shaped cross section provided with a slot groove in which an optical fiber is accommodated is covered with a sheath, and a support line provided along the longitudinal direction of the cable portion And a neck part that integrally connects the cable part and the support line part, and the two strength members are placed in the longitudinal direction of the cable on the neutral line connecting the center of the cable part and the center of the support line part.
  • a self-supporting optical fiber cable in which one strength member is embedded in a slot core corresponding to the bottom of the slot groove, and the other strength member is embedded in a sheath of the cable portion corresponding to the opening of the slot groove.
  • the neck portion is cut to separate the cable portion from the support wire portion, and then the separated cable portion is separated. Incision to a position where the scan reaches the slot core, after the cut to remove sheath portion was placed a predetermined length in the cable longitudinal direction, it is characterized by taking out the optical fiber from the slot groove.
  • the self-supporting optical fiber cable of the present invention since there is one slot groove, it is not necessary to search for which slot groove the optical fiber to be taken out is stored in the intermediate post branching operation, and the slot can be easily A specific optical fiber can be taken out from the groove. For this reason, the intermediate post-branching operation can be easily performed.
  • the optical fiber mounting position and the cable bending neutral line position coincide with each other, It is difficult for the optical fiber accommodated in the slot groove to be compressed or pulled, and the optical fiber meanders in the slot groove to avoid affecting cable characteristics such as transmission loss.
  • the two strength members provided in the cable part are embedded in the slot core and the other is embedded in the sheath, it is possible to avoid an increase in the slot core.
  • FIG. 1 is a cross-sectional view of a self-supporting optical fiber cable according to the present embodiment.
  • 2A to 2D are process diagrams showing an intermediate post-branching method of the self-supporting optical fiber cable shown in FIG.
  • FIG. 3 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a groove is formed as a mark for removing the sheath at the time of intermediate post branching.
  • FIG. 4 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a protrusion is formed as a mark for removing the sheath at the time of intermediate branching.
  • FIG. 1 is a cross-sectional view of a self-supporting optical fiber cable according to the present embodiment.
  • 2A to 2D are process diagrams showing an intermediate post-branching method of the self-supporting optical fiber cable shown in FIG.
  • FIG. 3 is a cross-sectional view of a self-supporting optical fiber cable showing an
  • FIG. 5 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a tear string is embedded in a portion corresponding to the mark for removing the sheath.
  • FIG. 6 is a cross-sectional view of a self-supporting optical fiber cable in which the opening of the slot groove is directed to the side opposite to the support line portion.
  • the self-supporting optical fiber cable 1 of this embodiment includes a cable portion 2, a support wire portion (also referred to as a hanging wire portion) 3, and the cable portion 2 and the support wire portion 3. And a neck portion 4 connected to the head.
  • the cable portion 2 includes a slot core 7 having a C-shaped cross section having a slot groove 6 in which an optical fiber 5 is housed, a pressing tape 8 that covers the opening 10 of the slot groove 6, and a sheath 9 that covers the slot core 7.
  • the optical fiber 5 is, for example, a collection of single-core fibers, a single-core optical fiber core (coated with a nylon, polyester elastomer, UV curable resin, etc. for reinforcement on a 250-micron optical fiber strand (tight buffer), 500 micron and 900 micron optical fiber cores), tape cores, and optical fiber strands fixed intermittently.
  • the optical fiber 5 in FIG. 1 is a tape core wire, and a plurality of tape core wires are mounted in the slot groove 6.
  • the slot core 7 is a holding member that accommodates and holds the optical fiber 5 therein, and has a slot groove 6 that is a circular arc having a center point at a position shifted from the center point O 1 of the cable portion 2.
  • the slot groove 6 is provided with the opening 10 facing the support line portion 3.
  • the slot core 7 is formed by extrusion molding, and a cross section perpendicular to the longitudinal direction has a C-shaped cross section.
  • the slot core 7 is not uniform in thickness, and gradually increases in thickness from the portion where the opening 10 is formed to the portion opposite to the opening 10. In other words, the thickness of the slot core 7 is gradually reduced from the portion corresponding to the bottom of the slot groove 6 to the portion where the opening 10 is formed.
  • the slot core 7 has a tension member for preventing the sheath 9 from being thermally contracted due to the influence of heat received at the place where the self-supporting optical fiber cable 1 is laid and the optical fiber cable itself being deformed.
  • one strength member 11 is embedded.
  • the one strength member 11 is formed in the longitudinal direction of the cable when two orthogonal lines passing through the cable center O1 in the cross section perpendicular to the longitudinal direction of the self-supporting optical fiber cable 1 are defined as the X axis and the Y axis. Along the Y axis.
  • the Y axis functions as a neutral line of the self-supporting optical fiber cable 1.
  • the position of the tensile body 11 is embedded in the slot core 7 along the longitudinal direction of the cable in the portion corresponding to the bottom of the slot groove 6 on the Y axis.
  • the strength member 11 is made of a wire such as a steel wire or FRP, and is a cable having a circular cross-sectional shape.
  • the sheath 9 has an uneven thickness sheath structure in which the sheath thickness facing the opening 10 side of the slot groove 6 is thicker than the sheath thickness on the side opposite to the opening 10 side.
  • the sheath thickness of the portion corresponding to the portion where the strength member 11 is provided is the thinnest, and the sheath thickness is gradually increased toward the portion facing the opening 10 of the slot groove 6.
  • the sheath thickness of the opposing part is the largest.
  • the sheath 9 is formed by extrusion molding so that the entire periphery of the slot core 7 containing the optical fiber 5 is covered with polyethylene resin.
  • a pressing tape 8 for preventing the polyethylene resin from entering the slot groove 6 is attached so as to close the opening 10.
  • the surface of the sheath 9 is provided with a sheath removal mark 12 which is a mark that becomes a tearing portion when the intermediate rear branch is made.
  • the sheath removal marks 12 are provided at two positions on the X axis, which is a line that passes through the center O1 of the cable portion 2 and perpendicularly intersects the Y axis that is a neutral line.
  • the sheath removal mark 12 is provided in the longitudinal direction of the cable as a color band having a color different from that of the sheath 9.
  • the other strength member 13 is embedded in the sheath 9.
  • the other strength member 13 is provided in the sheath 9 of the cable portion 2 corresponding to the opening 10 of the slot groove 6.
  • the other strength member 13 is provided on the Y axis, which is a neutral line, like the one strength member 11.
  • the same two tensile strength members 11 and 13 are used.
  • the support line portion 3 has a shape in which a plurality of support lines 14 are arranged so as to surround the periphery of the support line 14 in a circular arc shape with a single support line 14 as a center. Further, the support wire 14 is provided such that its longitudinal direction coincides with the longitudinal direction of the cable portion 2.
  • the support wire 14 are covered with the same sheath 9 as the cable portion 2, thereby forming a circular cross section smaller than the diameter of the cable portion 2.
  • the support wire 14 may have a structure in which a plurality of support wires are twisted, or may be a single steel wire or a wire material such as FRP.
  • the neck portion 4 integrally connects the cable portion 2 and the support wire portion 3 and is provided on the Y axis with respect to the cable portion 2 and the support wire portion 3.
  • the neck portion 4 may be formed continuously from one end to the other end in the entire cable longitudinal direction with respect to the cable portion 2 or may be intermittently connected to the cable portion 2.
  • the length of the support wire portion 3 is made shorter than the length of the cable portion 2 in order to give an extra length to the length of the cable portion 2. May be.
  • the two strength members 11 and 13 and the support line portion 3 are provided on the Y axis that is a neutral line, and therefore the cable bending direction is restricted. Is done.
  • FIG. 2 is a process diagram showing an intermediate post-branching method.
  • the intermediate post-branching operation for tearing the self-supporting optical fiber cable 1 from the middle of the cable to take out the specific optical fiber 5 and pulling the optical fiber 5 into the home corresponds to a part for taking out the optical fiber 5 first. Cut the neck 4 in the area. When the neck portion 4 is cut, the cable portion 2 is separated from the support wire portion 3.
  • the neutral line of the cable part 2 is on the Y axis even when it is cut off from the support line part 3 and coincides with the mounting position of the optical fiber 5. That is, the cable portion 2 is provided with two strength members 11 and 13, and these strength members 11 and 13 are both Y of two intersecting straight lines passing through the center position O1 of the cable portion 2. It is arranged on the axis (neutral line). Therefore, even if the cable part 2 cut off from the support line part 3 is bent, the optical fiber 5 is stretched or compressed, or the optical fiber 5 meanders in the slot groove 6 to cause a cable such as transmission loss. The possibility of affecting the properties is extremely low.
  • one strength member 11 is provided in the slot core 7, and another strength member 13 is provided in the sheath 9. Therefore, the two strength members 11, 13 are connected to the same slot core.
  • the outer diameter of the cable portion 2 can be reduced compared to the structure provided in FIG.
  • the sheath 9 of the separated cable portion 2 is cut with a cutter 15 or the like from both sides to the position where it reaches the slot core 7.
  • the position where the cut is made is the sheath removal mark 12 provided in the cable portion 2, and the cutter 15 is moved along the sheath removal mark 12 in the cable longitudinal direction by a predetermined length.
  • the cutting by the cutter 15 may be performed by cutting along the sheath removal mark 12 provided as a belt-like line, so that the sheath 9 can be cut without misplacement.
  • the cut sheath 9 is opened with a nipper 16 or the like and cut at an intermediate portion.
  • the sheath 9 at a site that has been torn over a predetermined length is removed.
  • a specific optical fiber 5 is taken out from the slot groove 6 and fusion-connected to a drop cable (not shown) for drawing the optical fiber 5 into the house. This operation completes the intermediate post-branch operation.
  • the self-supporting optical fiber cable of the present embodiment since there is one slot groove 6, there is no need to search for which slot groove the optical fiber 5 to be taken out is accommodated during the intermediate post branching operation.
  • the specific optical fiber 5 can be easily taken out from the slot groove 6. For this reason, the intermediate post-branching operation can be easily performed.
  • the self-supporting type optical fiber cable of the present embodiment even if the neck part 4 is cut and the cable part 2 is separated from the support line part 3 in the intermediate post-branching operation, the cable part 2 alone can Since the neutral position of the cable bend coincides with the optical fiber 5 accommodated in the slot groove 6, it is difficult for compression or tension to act, and the optical fiber 5 meanders in the slot groove 6 and transmission loss. Such as affecting the cable characteristics.
  • the opening 10 of the slot groove 6 is provided toward the support line portion 3, it is possible to prevent the optical fiber 5 from inadvertently jumping out of the slot groove 6. can do.
  • the cable portion 2 is located on a line (X axis) passing through the center O1 of the cable portion 2 and perpendicularly intersecting the neutral line (Y axis). Since the sheath removal mark 12 at the time of intermediate post-branching is provided on the surface of the sheath 9, anyone can definitely cut the sheath 9 accurately.
  • the intermediate post-branching method of the self-supporting optical fiber cable of the present embodiment even if the neck portion 4 is cut and the cable portion 2 is separated from the support wire portion 3, the cable portion 2 alone can Since the neutral line position of the cable bend matches, it is possible to prevent the optical fiber 5 from meandering in the slot groove 6.
  • the sheath 9 of the separated cable portion 2 is cut and the sheath 9 is removed, the optical fiber 5 can be taken out from the slot groove 6 without causing transmission loss.
  • the sheath removal mark 12 provided in the cable portion 2 is not a color band but a groove along the longitudinal direction of the cable.
  • these grooves serve as the sheath removal marks 12 at the time of intermediate rear branching.
  • a plurality of protrusions are formed along the longitudinal direction of the cable, and these protrusions are used as the sheath removal marks 12 at the time of intermediate rear branching.
  • a tear string 17 for tearing the sheath 9 of the cable portion 2 is embedded in a portion corresponding to the sheath removal mark 12.
  • the tear string 17 is embedded in the sheath 9 so as to be in contact with or close to the slot core 7 and is disposed along the longitudinal direction of the cable.
  • the neck portion 4 is cut to separate the cable portion 2 from the supporting wire portion 3, and then the sheath 9 at the site of the sheath removal mark 12 is removed.
  • the tear string 17 is taken out with a blade. Then, by pulling the tear string 17, the sheath 9 is torn in the longitudinal direction of the cable, and the sheath 9 having a predetermined length is removed. Since the tear string 17 is on the slot core 7, it can be taken out without damaging the optical fiber 5.
  • the opening 10 of the slot groove 6 is provided facing away from the support line portion 3.
  • the optical fiber 5 sags under its own weight when the sheath 9 of the cable portion 2 is removed and the optical fiber 5 is taken out. Therefore, the operation of taking out the specific optical fiber 5 from the slot groove 6 becomes easy.
  • the present invention can be used for a self-supporting optical fiber cable having a slot core having a C-shaped cross section.

Abstract

Provided is a self-supporting optical fiber cable with which it is possible to easily carry out a mid-span access operation. In a self-supporting optical fiber cable (12) in which a cable part (2) in which a C-shaped cross-section slot core (7) is covered with a sheath (9) is connected to a support wire part (3) via a neck part (4), two tensile bodies (11, 13) are disposed in the longitudinal direction of the cable upon a neutral line (y-axis) which joins the center (O1) of the cable part (2) with the center (O2) of the support wire part (3). One of the tensile bodies (11) is embedded in the slot core (7) corresponding to the bottom part of a slot depression (6), and the other of the tensile bodies (13) is embedded in the sheath (9) of the cable part (2) corresponding to an aperture (10) of the slot depression (6).

Description

自己支持型光ファイバケーブル及びその中間後分岐方法Self-supporting optical fiber cable and intermediate post-branching method
　本発明は、Ｃ字状断面のスロットコアを有した自己支持型光ファイバケーブル及びその中間後分岐方法に関する。 The present invention relates to a self-supporting optical fiber cable having a slot core with a C-shaped cross section, and an intermediate post branching method thereof.
　自己支持型光ファイバケーブルの一例として、例えば、特許文献１に記載された構造のものが提案されている。特許文献１に記載された自己支持型光ファイバケーブルは、周面に複数個のスロット溝を有し、そのスロット溝内に複数本の光ファイバテープ心線を積層配置させた断面円形状のスロットコアをシースで被覆したケーブル部を、首部を介して支持線部で連結した構造とされている。 As an example of a self-supporting optical fiber cable, for example, a structure described in Patent Document 1 has been proposed. A self-supporting optical fiber cable described in Patent Document 1 has a slot having a circular cross section in which a plurality of slot grooves are provided on a peripheral surface, and a plurality of optical fiber ribbons are stacked in the slot groove. A cable part in which a core is covered with a sheath is connected to a support line part via a neck part.
　この自己支持型光ファイバケーブルを中間後分岐するには、首部を切断して支持線部からケーブル部を切り離し、ケーブル部のシースにカッター等でケーブル長手方向に沿って切り込みを入れ、その切れ込みを入れた部位のシースをニッパー等で取り除いた後、露出したスロットコアのスロット溝から光ファイバ心線を取り出してドロップケーブルと接続を行う。 In order to branch the self-supporting optical fiber cable after the middle, the neck portion is cut to separate the cable portion from the support wire portion, and the cable portion sheath is cut along the longitudinal direction of the cable with a cutter or the like. After removing the sheath of the inserted portion with a nipper or the like, the optical fiber core wire is taken out from the exposed slot groove of the slot core and connected to the drop cable.
特開平１１－７２６６６号公報JP-A-11-72666
　しかしながら、特許文献１に記載の自己支持型光ファイバケーブルを中間後分岐すると、スロット溝が複数あるため、取り出すべき光ファイバが収納されたスロット溝を特定し難く、中間後分岐作業がし難い。 However, when the self-supporting optical fiber cable described in Patent Document 1 is branched after the middle, since there are a plurality of slot grooves, it is difficult to specify the slot groove in which the optical fiber to be taken out is stored, and the middle rear branching work is difficult.
　そこで、本発明は、中間後分岐作業が容易に行える自己支持型光ファイバケーブル及びその中間後分岐方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a self-supporting optical fiber cable that can easily perform an intermediate post-branching operation and an intermediate post-branching method.
　第１の発明は、光ファイバを内部に収納したスロット溝を備えた断面Ｃ字状のスロットコアをシースで被覆したケーブル部と、該ケーブル部の長手方向に沿って設けられ且つ支持線をシースで被覆した支持線部と、これらケーブル部と支持線部を一体的に連結する首部とを有した自己支持型光ファイバケーブルにおいて、前記ケーブル部の中心と前記支持線部の中心を結ぶ中立線上に２本の抗張力体をケーブル長手方向に設け、一方の抗張力体を、前記スロット溝の底部に対応する前記スロットコアに埋設し、他方の抗張力体を、前記スロット溝の開口と対応する前記ケーブル部の前記シースに埋設したことを特徴としている。 According to a first aspect of the present invention, there is provided a cable portion in which a slot core having a C-shaped cross section having a slot groove in which an optical fiber is accommodated is covered with a sheath, and a support line provided along the longitudinal direction of the cable portion In a self-supporting optical fiber cable having a support line portion covered with a cable and a neck portion that integrally connects the cable portion and the support line portion, on a neutral line connecting the center of the cable portion and the center of the support line portion Two strength members are provided in the longitudinal direction of the cable, one strength member is embedded in the slot core corresponding to the bottom of the slot groove, and the other strength member is the cable corresponding to the opening of the slot groove. It is characterized by being embedded in the sheath of the part.
　第２の発明は、第１の発明において、前記スロット溝の開口を、前記支持線部に向けて設ける又は前記支持線部とは反対側に向けて設けることを特徴としている。 The second invention is characterized in that, in the first invention, the opening of the slot groove is provided toward the support line portion or toward the opposite side to the support line portion.
　第３の発明は、第１または第２の発明において、前記ケーブル部の中心を通り前記中立線と垂直に交差する線上の位置であって前記ケーブル部のシース表面に、中間後分岐時のシース除去用目印を設けたことを特徴としている。 According to a third invention, in the first or second invention, the sheath at the time of intermediate rear branching is located on a line passing through the center of the cable part and perpendicularly intersecting the neutral line, and on the sheath surface of the cable part. A feature is that a removal mark is provided.
　第４の発明は、第３の発明において、前記シース除去用目印と対応する部位に、前記ケーブル部のシースを引き裂くための引き裂き紐が埋設されていることを特徴としている。 The fourth invention is characterized in that, in the third invention, a tear string for tearing the sheath of the cable portion is embedded in a portion corresponding to the mark for removing the sheath.
　第５の発明は、光ファイバを内部に収納したスロット溝を備えた断面Ｃ字状のスロットコアをシースで被覆したケーブル部と、該ケーブル部の長手方向に沿って設けられ且つ支持線をシースで被覆した支持線部と、これらケーブル部と支持線部を一体的に連結する首部とを備え、ケーブル部の中心と支持線部の中心を結ぶ中立線上に２本の抗張力体をケーブル長手方向に設け、一方の抗張力体を、前記スロット溝の底部に対応するスロットコアに埋設し、他方の抗張力体を、スロット溝の開口と対応するケーブル部のシースに埋設した自己支持型光ファイバケーブルの中間後分岐方法であって、ケーブルの途中で中間後分岐するに際して、前記首部を切断して前記支持線部から前記ケーブル部を分離させた後、その分離したケーブル部のシースに前記スロットコアに達する位置まで切り込みを入れ、その切れ込みをケーブル長手方向で所定長さ入れた部位のシースを除去した後、前記スロット溝から光ファイバを取り出すことを特徴としている。 According to a fifth aspect of the present invention, there is provided a cable portion in which a slot core having a C-shaped cross section provided with a slot groove in which an optical fiber is accommodated is covered with a sheath, and a support line provided along the longitudinal direction of the cable portion And a neck part that integrally connects the cable part and the support line part, and the two strength members are placed in the longitudinal direction of the cable on the neutral line connecting the center of the cable part and the center of the support line part. A self-supporting optical fiber cable in which one strength member is embedded in a slot core corresponding to the bottom of the slot groove, and the other strength member is embedded in a sheath of the cable portion corresponding to the opening of the slot groove. In the intermediate rear branching method, when the intermediate rear branch is performed in the middle of the cable, the neck portion is cut to separate the cable portion from the support wire portion, and then the separated cable portion is separated. Incision to a position where the scan reaches the slot core, after the cut to remove sheath portion was placed a predetermined length in the cable longitudinal direction, it is characterized by taking out the optical fiber from the slot groove.
　本発明の自己支持型光ファイバケーブルによれば、スロット溝が一つであるので、中間後分岐作業時にどのスロット溝に取り出すべき光ファイバが収納されているのかを探す必要がなく、容易にスロット溝から特定の光ファイバを取り出すことができる。このため、中間後分岐作業が容易に行える。また、本発明によれば、中間後分岐作業で首部を切断してケーブル部を支持線部から切り離しても、ケーブル部単体で光ファイバ実装位置とケーブル曲げの中立線位置とが一致するので、スロット溝内に収納された光ファイバに対して圧縮または引っ張りが作用し難く、光ファイバがスロット溝内で蛇行して伝送損失等のケーブル特性に影響を与えることが回避される。また、ケーブル部に設けられた２本の抗張力体は、一本はスロットコアに埋設され、もう一本はシースに埋設されているので、スロットコアが大きくなることを回避することができる。 According to the self-supporting optical fiber cable of the present invention, since there is one slot groove, it is not necessary to search for which slot groove the optical fiber to be taken out is stored in the intermediate post branching operation, and the slot can be easily A specific optical fiber can be taken out from the groove. For this reason, the intermediate post-branching operation can be easily performed. In addition, according to the present invention, even if the neck portion is cut by the intermediate post-branching operation and the cable portion is separated from the support wire portion, the optical fiber mounting position and the cable bending neutral line position coincide with each other, It is difficult for the optical fiber accommodated in the slot groove to be compressed or pulled, and the optical fiber meanders in the slot groove to avoid affecting cable characteristics such as transmission loss. In addition, since the two strength members provided in the cable part are embedded in the slot core and the other is embedded in the sheath, it is possible to avoid an increase in the slot core.
図１は本実施形態の自己支持型光ファイバケーブルの断面図である。FIG. 1 is a cross-sectional view of a self-supporting optical fiber cable according to the present embodiment. 図２（Ａ）～図２（Ｄ）は図１に示す自己支持型光ファイバケーブルの中間後分岐方法を示す工程図である。2A to 2D are process diagrams showing an intermediate post-branching method of the self-supporting optical fiber cable shown in FIG. 図３は中間後分岐時のシース除去用目印として溝を形成した例を示す自己支持型光ファイバケーブルの断面図である。FIG. 3 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a groove is formed as a mark for removing the sheath at the time of intermediate post branching. 図４は中間後分岐時のシース除去用目印として突起を形成した例を示す自己支持型光ファイバケーブルの断面図である。FIG. 4 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a protrusion is formed as a mark for removing the sheath at the time of intermediate branching. 図５はシース除去用目印と対応する部位に引き裂き紐を埋設した例を示す自己支持型光ファイバケーブルの断面図である。FIG. 5 is a cross-sectional view of a self-supporting optical fiber cable showing an example in which a tear string is embedded in a portion corresponding to the mark for removing the sheath. 図６はスロット溝の開口を支持線部とは反対側に向けた自己支持型光ファイバケーブルの断面図である。FIG. 6 is a cross-sectional view of a self-supporting optical fiber cable in which the opening of the slot groove is directed to the side opposite to the support line portion.
　以下、本発明を適用した具体的な実施形態について図面を参照しながら詳細に説明する。 Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.
　本実施形態の自己支持型光ファイバケーブル１は、図１に示すように、ケーブル部２と、支持線部（吊り線部ともいう）３と、これらケーブル部２と支持線部３を一体的に連結する首部４とを有している。 As shown in FIG. 1, the self-supporting optical fiber cable 1 of this embodiment includes a cable portion 2, a support wire portion (also referred to as a hanging wire portion) 3, and the cable portion 2 and the support wire portion 3. And a neck portion 4 connected to the head.
　ケーブル部２は、光ファイバ５を内部に収納したスロット溝６を備えた断面Ｃ字状のスロットコア７と、スロット溝６の開口１０を覆う押えテープ８と、スロットコア７を被覆するシース９を有する。 The cable portion 2 includes a slot core 7 having a C-shaped cross section having a slot groove 6 in which an optical fiber 5 is housed, a pressing tape 8 that covers the opening 10 of the slot groove 6, and a sheath 9 that covers the slot core 7. Have
　光ファイバ５は、例えば単心ファイバを集合したもの、単心光ファイバ心線（250ミクロン光ファイバ素線の上に補強用としてナイロンやポリエステルエラストマー、ＵＶ硬化樹脂等を被覆（タイトバッファ）した、500ミクロンや900ミクロンの光ファイバ心線）を集合したもの、テープ心線を集合したもの、間欠的に光ファイバ素線を固定したテープ心線等である。図１の光ファイバ５は、テープ心線であり、複数本のテープ心線をスロット溝６内に実装している。 The optical fiber 5 is, for example, a collection of single-core fibers, a single-core optical fiber core (coated with a nylon, polyester elastomer, UV curable resin, etc. for reinforcement on a 250-micron optical fiber strand (tight buffer), 500 micron and 900 micron optical fiber cores), tape cores, and optical fiber strands fixed intermittently. The optical fiber 5 in FIG. 1 is a tape core wire, and a plurality of tape core wires are mounted in the slot groove 6.
　スロットコア７は、光ファイバ５を内部に収納して保持する保持部材であり、ケーブル部２の中心点Ｏ１からずれた位置に中心点を持つ円弧とされたスロット溝６を有している。スロット溝６は、その開口１０を、支持線部３に向けて設けられている。スロットコア７は、押出成形にて形成され、その長手方向に垂直な断面をＣ形断面形状としている。前記スロットコア７は、肉厚が均一ではなく、開口１０が形成される部位から該開口１０とは反対側の部位へ行くに従って徐々にその肉厚を厚くしている。逆の見方をすれば、スロットコア７は、スロット溝６の底と対応する部位から開口１０が形成される部位に行くに従って徐々にその肉厚を薄くしている。 The slot core 7 is a holding member that accommodates and holds the optical fiber 5 therein, and has a slot groove 6 that is a circular arc having a center point at a position shifted from the center point O 1 of the cable portion 2. The slot groove 6 is provided with the opening 10 facing the support line portion 3. The slot core 7 is formed by extrusion molding, and a cross section perpendicular to the longitudinal direction has a C-shaped cross section. The slot core 7 is not uniform in thickness, and gradually increases in thickness from the portion where the opening 10 is formed to the portion opposite to the opening 10. In other words, the thickness of the slot core 7 is gradually reduced from the portion corresponding to the bottom of the slot groove 6 to the portion where the opening 10 is formed.
　また、スロットコア７には、自己支持型光ファイバケーブル１を布設した場所で受ける熱等の影響でシース９が熱収縮して該光ファイバケーブル自体が変形するのを抑制するために、テンションメンバーである２本のうち一方の抗張力体１１が埋め込まれている。この一方の抗張力体１１は、自己支持型光ファイバケーブル１のケーブル長手方向に垂直な断面においてケーブル中心Ｏ１を通る２本の直交する線をＸ軸及びＹ軸としたときに、前記ケーブル長手方向に沿って前記Ｙ軸上に設けられている。なお、Ｙ軸は、この自己支持型光ファイバケーブル１の中立線として機能する。 Further, the slot core 7 has a tension member for preventing the sheath 9 from being thermally contracted due to the influence of heat received at the place where the self-supporting optical fiber cable 1 is laid and the optical fiber cable itself being deformed. Among the two, one strength member 11 is embedded. The one strength member 11 is formed in the longitudinal direction of the cable when two orthogonal lines passing through the cable center O1 in the cross section perpendicular to the longitudinal direction of the self-supporting optical fiber cable 1 are defined as the X axis and the Y axis. Along the Y axis. The Y axis functions as a neutral line of the self-supporting optical fiber cable 1.
　抗張力体１１の位置は、前記Ｙ軸上であって、スロット溝６の底部と対応する部位にケーブル長手方向に沿ってスロットコア７に埋め込まれている。かかる抗張力体１１は、例えば鋼線やＦＲＰ等の線材からなり、断面形状を円形としたケーブルとされている。 The position of the tensile body 11 is embedded in the slot core 7 along the longitudinal direction of the cable in the portion corresponding to the bottom of the slot groove 6 on the Y axis. The strength member 11 is made of a wire such as a steel wire or FRP, and is a cable having a circular cross-sectional shape.
　シース９は、スロット溝６の開口１０側と対向するシース厚を、該開口１０側と反対側のシース厚よりも厚くした偏肉シース構造とされている。この実施形態では、抗張力体１１が設けられる部位と対応する部位のシース厚が最も薄く、前記スロット溝６の開口１０と対向する部位に向かって徐々にそのシース厚が厚くされ、該開口１０と対向する部位のシース厚が最も厚くされている。 The sheath 9 has an uneven thickness sheath structure in which the sheath thickness facing the opening 10 side of the slot groove 6 is thicker than the sheath thickness on the side opposite to the opening 10 side. In this embodiment, the sheath thickness of the portion corresponding to the portion where the strength member 11 is provided is the thinnest, and the sheath thickness is gradually increased toward the portion facing the opening 10 of the slot groove 6. The sheath thickness of the opposing part is the largest.
　かかるシース９は、光ファイバ５を収納したスロットコア７の周囲全体をポリエチレン樹脂で被覆するようにして形成する押出成形により形成される。成形時には、スロット溝６内にポリエチレン樹脂が入り込まないようにするための押えテープ８が、前記開口１０を塞ぐように添えられている。 The sheath 9 is formed by extrusion molding so that the entire periphery of the slot core 7 containing the optical fiber 5 is covered with polyethylene resin. At the time of molding, a pressing tape 8 for preventing the polyethylene resin from entering the slot groove 6 is attached so as to close the opening 10.
　シース９の表面には、中間後分岐時に切り裂き箇所となる目印であるシース除去用目印１２が設けられている。このシース除去用目印１２は、ケーブル部２の中心Ｏ１を通り中立線であるＹ軸と垂直に交差する線上であるＸ軸上の位置に２ヶ所設けられている。シース除去用目印１２は、シース９とは異なる色とされた色帯としてケーブル長手方向に設けられている。 The surface of the sheath 9 is provided with a sheath removal mark 12 which is a mark that becomes a tearing portion when the intermediate rear branch is made. The sheath removal marks 12 are provided at two positions on the X axis, which is a line that passes through the center O1 of the cable portion 2 and perpendicularly intersects the Y axis that is a neutral line. The sheath removal mark 12 is provided in the longitudinal direction of the cable as a color band having a color different from that of the sheath 9.
　また、シース９には、他方の抗張力体１３が埋設されている。この他方の抗張力体１３は、スロット溝６の開口１０と対応する前記ケーブル部２のシース９に設けられている。この他方の抗張力体１３は、一方の抗張力体１１と同じく中立線であるＹ軸上に設けられている。２本の抗張力体１１、１３は、何れも同じものが使用される。　
　支持線部３は、１本の支持線１４を中心としてその周囲を円弧状に取り囲むようにして複数本の支持線１４が配列された形状とされている。また、支持線１４は、その長手方向をケーブル部２の長手方向に一致させて設けられている。これら支持線１４は、ケーブル部２と同一のシース９にて被覆されることで、ケーブル部２の直径よりも小さな円形断面として形成されている。なお、支持線１４は、複数の支持線を撚った構造でも良く、１本の単鋼線やＦＲＰ等の線材でも良い。 The other strength member 13 is embedded in the sheath 9. The other strength member 13 is provided in the sheath 9 of the cable portion 2 corresponding to the opening 10 of the slot groove 6. The other strength member 13 is provided on the Y axis, which is a neutral line, like the one strength member 11. The same two tensile strength members 11 and 13 are used.
The support line portion 3 has a shape in which a plurality of support lines 14 are arranged so as to surround the periphery of the support line 14 in a circular arc shape with a single support line 14 as a center. Further, the support wire 14 is provided such that its longitudinal direction coincides with the longitudinal direction of the cable portion 2. These support wires 14 are covered with the same sheath 9 as the cable portion 2, thereby forming a circular cross section smaller than the diameter of the cable portion 2. The support wire 14 may have a structure in which a plurality of support wires are twisted, or may be a single steel wire or a wire material such as FRP.
　首部４は、ケーブル部２と支持線部３を一体的に連結し、前記ケーブル部２と支持線部３に対して共にＹ軸上に設けられている。かかる首部４は、ケーブル部２に対してケーブル長手方向全体に一端から他端まで連続して形成されていてもよく、又は間欠的にケーブル部２に接続されていてもよい。なお、ケーブル部２に対して首部４が間欠的に接続される場合、ケーブル部２の長さに余長を持たせるために支持線部３の長さをケーブル部２の長さよりも短くしてもよい。 The neck portion 4 integrally connects the cable portion 2 and the support wire portion 3 and is provided on the Y axis with respect to the cable portion 2 and the support wire portion 3. The neck portion 4 may be formed continuously from one end to the other end in the entire cable longitudinal direction with respect to the cable portion 2 or may be intermittently connected to the cable portion 2. When the neck portion 4 is intermittently connected to the cable portion 2, the length of the support wire portion 3 is made shorter than the length of the cable portion 2 in order to give an extra length to the length of the cable portion 2. May be.
　このように構成された自己支持型光ファイバケーブル１は、２本の抗張力体１１、１３と支持線部３とが中立線であるＹ軸線上に設けられているため、そのケーブル曲げ方向が規制される。 In the self-supporting type optical fiber cable 1 configured in this way, the two strength members 11 and 13 and the support line portion 3 are provided on the Y axis that is a neutral line, and therefore the cable bending direction is restricted. Is done.
　次に、図１に示した自己支持型光ファイバケーブル１の中間後分岐方法について説明する。図２は中間後分岐方法を示す工程図である。 Next, the intermediate post-branching method of the self-supporting optical fiber cable 1 shown in FIG. 1 will be described. FIG. 2 is a process diagram showing an intermediate post-branching method.
　自己支持型光ファイバケーブル１をケーブルの途中から引き裂いて特定の光ファイバ５を取り出し、例えばこの光ファイバ５を宅内へ引き込むための中間後分岐作業は、先ず、光ファイバ５を取り出す部位に相当する領域にある首部４を切断する。首部４を切断すると、支持線部３からケーブル部２が分離される。 The intermediate post-branching operation for tearing the self-supporting optical fiber cable 1 from the middle of the cable to take out the specific optical fiber 5 and pulling the optical fiber 5 into the home, for example, corresponds to a part for taking out the optical fiber 5 first. Cut the neck 4 in the area. When the neck portion 4 is cut, the cable portion 2 is separated from the support wire portion 3.
　ケーブル部２の中立線は、支持線部３から切り離されてもＹ軸上にあり、光ファイバ５の実装位置と一致する。つまり、ケーブル部２には２本の抗張力体１１、１３が設けられているが、これら抗張力体１１、１３は、何れもケーブル部２の中心位置Ｏ１を通る２本の交差する直線のうちＹ軸（中立線）上に配置されている。したがって、支持線部３から切り離されたケーブル部２は、曲げられたりしても光ファイバ５に伸びまたは圧縮が作用したり、スロット溝６内で光ファイバ５が蛇行して伝送損失等のケーブル特性に影響を与える可能性が極めて低くなる。 The neutral line of the cable part 2 is on the Y axis even when it is cut off from the support line part 3 and coincides with the mounting position of the optical fiber 5. That is, the cable portion 2 is provided with two strength members 11 and 13, and these strength members 11 and 13 are both Y of two intersecting straight lines passing through the center position O1 of the cable portion 2. It is arranged on the axis (neutral line). Therefore, even if the cable part 2 cut off from the support line part 3 is bent, the optical fiber 5 is stretched or compressed, or the optical fiber 5 meanders in the slot groove 6 to cause a cable such as transmission loss. The possibility of affecting the properties is extremely low.
　このケーブル部２では、スロットコア７に１本の抗張力体１１を設け、シース９にもう１本の抗張力体１３を設けた構造であるため、２本の抗張力体１１、１３を同一のスロットコア７に設けた構造に比べてケーブル部２の外径を小さくすることができる。 In this cable portion 2, one strength member 11 is provided in the slot core 7, and another strength member 13 is provided in the sheath 9. Therefore, the two strength members 11, 13 are connected to the same slot core. The outer diameter of the cable portion 2 can be reduced compared to the structure provided in FIG.
　次に、図２（Ａ）に示すように、分離したケーブル部２のシース９に両側からスロットコア７に達する位置までカッター１５等で切れ込みを入れる。切れ込みを入れる位置は、ケーブル部２に設けたシース除去用目印１２とし、このシース除去用目印１２に沿ってケーブル長手方向にカッター１５を所定長さ移動させる。カッター１５による切れ込みは、帯状のラインとして設けられたシース除去用目印１２に沿って切れ込んで行けば良いので位置を誤ることなくシース９を切断することができる。 Next, as shown in FIG. 2 (A), the sheath 9 of the separated cable portion 2 is cut with a cutter 15 or the like from both sides to the position where it reaches the slot core 7. The position where the cut is made is the sheath removal mark 12 provided in the cable portion 2, and the cutter 15 is moved along the sheath removal mark 12 in the cable longitudinal direction by a predetermined length. The cutting by the cutter 15 may be performed by cutting along the sheath removal mark 12 provided as a belt-like line, so that the sheath 9 can be cut without misplacement.
　続いて、図２（Ｂ）に示すように、切り裂いたシース９をニッパー１６等で開いて中間部で切断する。そして、図２（Ｃ）に示すように、所定長さに渡って切り裂いた部位のシース９を除去する。最後に、図２（Ｄ）に示すように、スロット溝６から特定の光ファイバ５を取り出し、その光ファイバ５を宅内へ引き込むためのドロップケーブル（図示は省略する）に融着接続する。この作業で中間後分岐作業が終了する。 Subsequently, as shown in FIG. 2 (B), the cut sheath 9 is opened with a nipper 16 or the like and cut at an intermediate portion. Then, as shown in FIG. 2 (C), the sheath 9 at a site that has been torn over a predetermined length is removed. Finally, as shown in FIG. 2 (D), a specific optical fiber 5 is taken out from the slot groove 6 and fusion-connected to a drop cable (not shown) for drawing the optical fiber 5 into the house. This operation completes the intermediate post-branch operation.
　本実施形態の自己支持型光ファイバケーブルによれば、スロット溝６が一つであるので、中間後分岐作業時にどのスロット溝に取り出すべき光ファイバ５が収納されているのかを探す必要がなく、容易にスロット溝６から特定の光ファイバ５を取り出すことができる。このため、中間後分岐作業が容易に行える。 According to the self-supporting optical fiber cable of the present embodiment, since there is one slot groove 6, there is no need to search for which slot groove the optical fiber 5 to be taken out is accommodated during the intermediate post branching operation. The specific optical fiber 5 can be easily taken out from the slot groove 6. For this reason, the intermediate post-branching operation can be easily performed.
　また、本実施形態の自己支持型光ファイバケーブルによれば、中間後分岐作業で首部４を切断してケーブル部２を支持線部３から切り離しても、ケーブル部２単体で光ファイバ実装位置とケーブル曲げの中立線位置とが一致しているので、スロット溝６内に収納された光ファイバ５に対して圧縮または引っ張りが作用し難く、光ファイバ５がスロット溝６内で蛇行して伝送損失等のケーブル特性に影響を与えることが回避される。 Moreover, according to the self-supporting type optical fiber cable of the present embodiment, even if the neck part 4 is cut and the cable part 2 is separated from the support line part 3 in the intermediate post-branching operation, the cable part 2 alone can Since the neutral position of the cable bend coincides with the optical fiber 5 accommodated in the slot groove 6, it is difficult for compression or tension to act, and the optical fiber 5 meanders in the slot groove 6 and transmission loss. Such as affecting the cable characteristics.
　また、本実施形態の自己支持型光ファイバケーブルによれば、スロット溝６の開口１０を支持線部３に向けて設けているので、不用意にスロット溝６から光ファイバ５が飛び出ることを防止することができる。 Further, according to the self-supporting optical fiber cable of the present embodiment, since the opening 10 of the slot groove 6 is provided toward the support line portion 3, it is possible to prevent the optical fiber 5 from inadvertently jumping out of the slot groove 6. can do.
　また、本実施形態の自己支持型光ファイバケーブルによれば、ケーブル部２の中心Ｏ１を通り中立線（Ｙ軸）と垂直に交差する線（Ｘ軸）上の位置であって前記ケーブル部２のシース９表面に、中間後分岐時のシース除去用目印１２を設けたので、誰でも間違いなく正確にシース９に切れ込みを入れることができる。 Further, according to the self-supporting optical fiber cable of the present embodiment, the cable portion 2 is located on a line (X axis) passing through the center O1 of the cable portion 2 and perpendicularly intersecting the neutral line (Y axis). Since the sheath removal mark 12 at the time of intermediate post-branching is provided on the surface of the sheath 9, anyone can definitely cut the sheath 9 accurately.
　また、本実施形態の自己支持型光ファイバケーブルの中間後分岐方法によれば、首部４を切断して支持線部３からケーブル部２を分離してもケーブル部２単体で光ファイバ実装位置とケーブル曲げの中立線位置とが一致するので、光ファイバ５がスロット溝６内で蛇行するようなことを防止することができる。そして、分離したケーブル部２のシース９に切れ込みを入れて該シース９を除去すれば、スロット溝６から光ファイバ５を伝送損失を生じさせることなく取り出すことができる。 Further, according to the intermediate post-branching method of the self-supporting optical fiber cable of the present embodiment, even if the neck portion 4 is cut and the cable portion 2 is separated from the support wire portion 3, the cable portion 2 alone can Since the neutral line position of the cable bend matches, it is possible to prevent the optical fiber 5 from meandering in the slot groove 6. When the sheath 9 of the separated cable portion 2 is cut and the sheath 9 is removed, the optical fiber 5 can be taken out from the slot groove 6 without causing transmission loss.
　以上が本発明を適用した自己支持型光ファイバケーブルの一実施形態であるが、それ以外の実施形態を以下に説明する。 The above is one embodiment of a self-supporting optical fiber cable to which the present invention is applied. Other embodiments will be described below.
　図３は、ケーブル部２に設けたシース除去用目印１２として色帯ではなく、ケーブル長手方向に沿う溝としている。この例では、複数の溝をケーブル長手方向に沿って形成することで、これらの溝を中間後分岐時のシース除去用目印１２としている。図４は、複数の突起をケーブル長手方向に沿って形成することで、これらの突起を中間後分岐時のシース除去用目印１２としている。 In FIG. 3, the sheath removal mark 12 provided in the cable portion 2 is not a color band but a groove along the longitudinal direction of the cable. In this example, by forming a plurality of grooves along the cable longitudinal direction, these grooves serve as the sheath removal marks 12 at the time of intermediate rear branching. In FIG. 4, a plurality of protrusions are formed along the longitudinal direction of the cable, and these protrusions are used as the sheath removal marks 12 at the time of intermediate rear branching.
　図５は、シース除去用目印１２と対応する部位に、ケーブル部２のシース９を引き裂くための引き裂き紐１７が埋設されている。引き裂き紐１７は、スロットコア７に接触するか或いは近接するようにしてシース９に埋め込まれ、ケーブル長手方向に沿って配置されている。 In FIG. 5, a tear string 17 for tearing the sheath 9 of the cable portion 2 is embedded in a portion corresponding to the sheath removal mark 12. The tear string 17 is embedded in the sheath 9 so as to be in contact with or close to the slot core 7 and is disposed along the longitudinal direction of the cable.
　図５に示す自己支持型光ファイバケーブル１を中間後分岐するには、首部４を切断してケーブル部２を支持線部３から分離させた後、シース除去用目印１２の部位のシース９を刃で削って引き裂き紐１７を取り出す。そして、引き裂き紐１７を引っ張ることで、シース９をケーブル長手方向に引き裂き、所定長さのシース９を除去する。引き裂き紐１７は、スロットコア７上にあるため、誤って光ファイバ５を傷付けることなく取り出すことができる。 In order to branch the self-supporting optical fiber cable 1 shown in FIG. 5 after the middle, the neck portion 4 is cut to separate the cable portion 2 from the supporting wire portion 3, and then the sheath 9 at the site of the sheath removal mark 12 is removed. The tear string 17 is taken out with a blade. Then, by pulling the tear string 17, the sheath 9 is torn in the longitudinal direction of the cable, and the sheath 9 having a predetermined length is removed. Since the tear string 17 is on the slot core 7, it can be taken out without damaging the optical fiber 5.
　図６は、スロット溝６の開口１０を、支持線部３とは反対側に向けて設けている。この図６に示す自己支持型光ファイバケーブル１を中間後分岐した場合は、ケーブル部２のシース９を除去して光ファイバ５を取り出す際に自重で光ファイバ５が下方へたるむようになる。そのため、スロット溝６から特定の光ファイバ５を取り出す作業が容易になる。 In FIG. 6, the opening 10 of the slot groove 6 is provided facing away from the support line portion 3. When the self-supporting optical fiber cable 1 shown in FIG. 6 is branched after the middle, the optical fiber 5 sags under its own weight when the sheath 9 of the cable portion 2 is removed and the optical fiber 5 is taken out. Therefore, the operation of taking out the specific optical fiber 5 from the slot groove 6 becomes easy.
　本発明は、断面Ｃ字状のスロットコアを有した自己支持型光ファイバケーブルに利用することができる。 The present invention can be used for a self-supporting optical fiber cable having a slot core having a C-shaped cross section.

Claims (5)

  1. 　光ファイバを内部に収納したスロット溝を備えた断面Ｃ字状のスロットコアをシースで被覆したケーブル部と、
    　該ケーブル部の長手方向に沿って設けられ且つ支持線をシースで被覆した支持線部と、
    　これらケーブル部と支持線部を一体的に連結する首部とを有し、
    　前記ケーブル部の中心と前記支持線部の中心を結ぶ中立線上に２本の抗張力体をケーブル長手方向に設け、一方の抗張力体を、前記スロット溝の底部に対応する前記スロットコアに埋設し、他方の抗張力体を、前記スロット溝の開口と対応する前記ケーブル部の前記シースに埋設した
    　ことを特徴とする自己支持型光ファイバケーブル。     A cable portion in which a slot core having a C-shaped cross section having a slot groove accommodating an optical fiber is covered with a sheath;
    A support wire portion provided along the longitudinal direction of the cable portion and covering the support wire with a sheath;
    These cable portions and a neck portion that integrally connects the support wire portions,
    Two strength members are provided in a cable longitudinal direction on a neutral line connecting the center of the cable portion and the center of the support wire portion, and one strength member is embedded in the slot core corresponding to the bottom of the slot groove, A self-supporting optical fiber cable, wherein the other strength member is embedded in the sheath of the cable portion corresponding to the opening of the slot groove.
  2. 　前記スロット溝の開口を、前記支持線部に向けて設ける又は前記支持線部とは反対側に向けて設ける
    　ことを特徴とする請求項１に記載の自己支持型光ファイバケーブル。     2. The self-supporting optical fiber cable according to claim 1, wherein the opening of the slot groove is provided toward the support line part or toward the side opposite to the support line part.
  3. 　前記ケーブル部の中心を通り前記中立線と垂直に交差する線上の位置であって前記ケーブル部のシース表面に、中間後分岐時のシース除去用目印を設けた
    　ことを特徴とする請求項１又は２に記載の自己支持型光ファイバケーブル。     The sheath removal mark at the time of intermediate rear branching is provided on the sheath surface of the cable portion at a position on a line that passes through the center of the cable portion and perpendicularly intersects the neutral line. 2. A self-supporting optical fiber cable according to 2.
  4. 　前記シース除去用目印と対応する部位に埋設された、前記ケーブル部のシースを引き裂くための引き裂き紐を更に備えることを特徴とする請求項３に記載の自己支持型光ファイバケーブル。 The self-supporting optical fiber cable according to claim 3, further comprising a tear string embedded in a portion corresponding to the sheath removal mark for tearing the sheath of the cable portion.
  5. 　光ファイバを内部に収納したスロット溝を備えた断面Ｃ字状のスロットコアをシースで被覆したケーブル部と、該ケーブル部の長手方向に沿って設けられ且つ支持線をシースで被覆した支持線部と、これらケーブル部と支持線部を一体的に連結する首部とを備え、ケーブル部の中心と支持線部の中心を結ぶ中立線上に２本の抗張力体をケーブル長手方向に設け、一方の抗張力体を、前記スロット溝の底部に対応するスロットコアに埋設し、他方の抗張力体を、スロット溝の開口と対応するケーブル部のシースに埋設した自己支持型光ファイバケーブルの中間後分岐方法であって、
    　ケーブルの途中で中間後分岐するに際して、前記首部を切断して前記支持線部から前記ケーブル部を分離させた後、その分離したケーブル部のシースに前記スロットコアに達する位置まで切り込みを入れ、その切れ込みをケーブル長手方向で所定長さ入れた部位のシースを除去した後、前記スロット溝から光ファイバを取り出す
    　ことを特徴とする自己支持型光ファイバケーブルの中間後分岐方法。     A cable part in which a slot core having a C-shaped cross section having a slot groove that accommodates an optical fiber is covered with a sheath, and a support line part that is provided along the longitudinal direction of the cable part and whose support line is covered with a sheath And a neck portion integrally connecting the cable portion and the support wire portion, and two strength members are provided in the cable longitudinal direction on a neutral line connecting the center of the cable portion and the center of the support wire portion. A self-supporting optical fiber cable intermediate post-branching method in which a body is embedded in a slot core corresponding to the bottom of the slot groove and the other strength member is embedded in a sheath of the cable portion corresponding to the opening of the slot groove. And
    When branching in the middle of the cable, the neck portion is cut to separate the cable portion from the support wire portion, and then the sheath of the separated cable portion is cut to reach the slot core. An intermediate post-branching method for a self-supporting optical fiber cable, wherein the optical fiber is taken out from the slot groove after removing a sheath at a portion where the cut is inserted in a predetermined length in the cable longitudinal direction.
PCT/JP2012/077850 2011-11-04 2012-10-29 Self-supporting optical fiber cable and mid-span access method WO2013065625A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849824A (en) * 2015-06-15 2015-08-19 长飞光纤光缆股份有限公司 Full-dry nonmetal self-supporting skeleton-type optical cable
EP3115816A4 (en) * 2014-03-06 2017-10-04 Fujikura Ltd. Optical cable

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02119314U (en) * 1989-03-11 1990-09-26
JP2002064916A (en) * 2000-08-21 2002-02-28 Nippon Telegraph & Telephone East Corp Cable insulator stripper
JP2007127887A (en) * 2005-11-04 2007-05-24 Fujikura Ltd Optical fiber cable
JP2008076897A (en) * 2006-09-22 2008-04-03 Fujikura Ltd Optical fiber cable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02119314U (en) * 1989-03-11 1990-09-26
JP2002064916A (en) * 2000-08-21 2002-02-28 Nippon Telegraph & Telephone East Corp Cable insulator stripper
JP2007127887A (en) * 2005-11-04 2007-05-24 Fujikura Ltd Optical fiber cable
JP2008076897A (en) * 2006-09-22 2008-04-03 Fujikura Ltd Optical fiber cable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3115816A4 (en) * 2014-03-06 2017-10-04 Fujikura Ltd. Optical cable
US10061096B2 (en) 2014-03-06 2018-08-28 Fujikura Ltd. Optical cable
CN104849824A (en) * 2015-06-15 2015-08-19 长飞光纤光缆股份有限公司 Full-dry nonmetal self-supporting skeleton-type optical cable
WO2016202148A1 (en) * 2015-06-15 2016-12-22 长飞光纤光缆股份有限公司 Optical cable having full-dry type non-metal self-supporting skeleton

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