201140184 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種將光纖收納在設有2條以上的抗張 力體之狹孔芯部並利用護套予以被覆之光纖纜線，尤其是 關於一種可以得到在閉合構件之穩定的抗張力體的夾持狀 態之光纖纜線的構造。 【先前技術】 光纖纜線一般而言係由將光纖收納在內部之具有狹孔 溝的狹孔芯部、以及被覆該狹孔芯部的周圍之形成爲偏厚 構造的護套加以構成。在該光纖纜線中，根據形成在狹孔 芯部的狹孔溝與護套的偏厚構造，當在纜線施加彎曲時， 以比纜線剖面的中心軸更被彎曲的內側作爲中心倒入的方 式而使纜線變形。爲了防止該變形，在狹孔芯部中埋入2 條張力構件之抗張力體（例如專利文獻1所記載）。 該種類的光纖纜線係在用以從水或外力保護連接光纖 纜線的連接部或是多餘長度部份之箱盒的閉合構件內，必 須使從狹孔芯部朝外方取出的2條抗張力體穩定並予以固 定。在閉合構件內係例如第5圖所示，藉由在插入孔1 03插 入2條抗張力體1 0 1、1 02並利用固定螺絲1 〇4夾緊，設置夾 持固定此等抗張力體101、102的夾持模具105。 先前技術文獻 專利文獻 專利文獻1 :日本特開2 0 0 8 - 0 7 6 8 9 7號公報 201140184 【發明內容】 (發明槪要） (發明所欲解決之課題） 在使用其線徑不同（大徑與小徑）者作爲前述2條抗 張力體101、102的情況下，雖然直徑爲大的抗張力體101 係可以利用固定螺絲1 04加以固定，但是直徑爲小的抗張 力體102係在與固定螺絲104之間產生間隙而無法固定或是 使固定力變弱。爲此，在使用直徑不同的抗張力體1 〇 1、 102的情況下，無法利用固定螺絲104均勻夾持兩者，在其 夾持力產生偏差而無法取得一方的抗張力體102之導通造 成無法接地的情形。 又當2條抗張力體101、102的直徑有所不同時，在利 用固定螺絲1 04固定時必須注意纜線的方向性進行作業的 同時，而且在從狹孔芯部取出抗張力體101、102時，雖然 —方的抗張力體易於取出，但是另一方抗張力體則難以取 出。 因此，本發明係以提供一種可以均勻夾持固定全部的 抗張力體之光纖纜線爲目的。 (解決課題之手段） 本發明之一樣態係爲光纖纜線’其特徵爲具備：將光 纖收納在狹孔溝並予以支撐之狹孔芯部、以及被覆包含前 述狹孔溝的開口部之狹孔芯部整體之護套，前述護套係形 -6- 201140184 成爲將與前述狹孔溝的開口部側對向之護套厚度作成比與 該開口部側相反側的護套厚度更厚之偏厚護套構造’在前 述狹孔芯部設置相同尺寸且相同剖面形狀之至少2條以上 的抗張力體。 前述抗張力體係設置爲相互接近爲佳。 將設有前述狹孔芯部之前述抗張力體的部位的厚度設 成比其他部位的厚度更薄亦可。 (發明之效果） 根據本發明之光纖纜線’因爲在利用根據部位使護套 厚度不同之偏厚護套構造的護套予以被覆的狹孔芯部’設 置呈相同尺寸且相同剖面形狀之2條以上的抗張力體’當 利用設置在閉合構件內之夾持模具夾持此等抗張力體時， 由於全部的抗張力體爲相同尺寸且相同剖面形狀，因此可 以利用夾持模具均勻夾持固定全部抗張力體。其結果爲’ 不須要所謂在對於夾持模具之纜線的安裝作業時考量纜線 的方向性才進行作業之煩雜作業的同時，而且可以確實取 得全部的抗張力體之接地，而且從狹孔芯部之抗張力體的 取出也可以容易進行。 【實施方式】 (用以實施發明之形態） 以下，針對適用本發明之具體的實施形態，一邊參照 圖面一邊詳細說明。 201140184 第1圖係顯示本實施形態之光纖纜線，其爲切除一部 份的護套之狀態的立體圖，第2圖係爲本實施形態之光纖 纜線的剖面圖。 本實施形態之光纖纜線1係如第1及2圖所示，由將光 纖2收納在狹孔溝3並予以支撐之狹孔芯部4、以及被覆包 含該狹孔溝3的開口部5之狹孔芯部整體之護套6構成。 在光纖2中係使用光纖母線、光纖芯線、光纖帶芯線 等。光纖母線係爲在光纖之上被覆紫外線硬化樹脂者。光 纖芯線係爲在光纖之上被覆塑膠樹脂使其直徑成爲比光纖 母線更大者。光纖帶芯線係爲平行並列複數個光纖母線並 利用紫外線硬化樹脂予以被覆者。在第1及2圖中，其係使 用光纖帶芯線，將複數張（6張）的該光纖帶芯線收納在 狹孔溝3內。在光纖2與狹孔溝3之間係介在有干涉材亦可 ，使其成爲空隙亦可。 狹孔芯部4係爲將光纖2收納於內部並予以支撐之支撐 構件，具有以從光纖纜線1的中心點C偏離的位置爲中心點 之形成爲圓弧的狹孔溝3。該狹孔芯部4係利用押出成形加 以形成，並將與其長度方向垂直的剖面作成C形剖面形狀 。該狹孔芯部4係使其厚度不平均，從形成開口部5的部份 開始順著往與該開口部相反側的部份慢慢地使其厚度變厚 。若是相反的看法時，狹孔芯部4係從與狹孔溝3的底部對 應的部位開始順著往形成開口部5的部位慢慢地使其厚度 變薄。 又爲了抑制由於在舖設光纖纜線1的場所受到之熱等 -8- 201140184 影響而使護套熱收縮，造成該光纖纜線1本身的變形，在 狹孔芯部4中係埋入張力構件之2條抗張力體7 ( 7A、7B ) 。抗張力體7係例如由鋼線或FRP等線材構成。在本實施形 態中，該2條抗張力體7A、7B係使用相同尺寸且相同剖面 形狀者。就在此所定義的相同尺寸而言係除了完全沒有誤 差之完全相同之外，也包含稍微的誤差（±0.03mm程度的 誤差）。同樣地就相同剖面形狀而言，除了完全相同之外 ，也包含稍微的誤差。在第1及2圖中，將呈圓形剖面形狀 的相同直徑的鋼線作爲抗張力體7。又在本實施形態中， 雖然抗張力體7設爲2條，但是因應必要設爲3條以上也沒 關係。 前述2條抗張力體7A、7B係設置在通過前述光纖纜線1 的中心點C，並與狹孔溝3的底部之部位對應的位置接近之 同一直線上。爲此，狹孔芯線4之設有抗張力體7A、7B的 部位之厚度係設成比其他以外的部位之厚度更薄。例如在 狹孔芯部4的部位之中，2條抗張力體7A、7B間的狹孔芯部 厚度T1、一方的抗張力體7A與狹孔溝3間的狹孔芯部厚度 T2、及另一方的抗張力體7B與護套6間的狹孔芯部厚度T3 係設成比任何其他部位的厚度都薄很多。 護套6係形成爲將與狹孔溝3的開口部5側對向之護套 厚度T4作成比與該開口部5側相反側的護套厚度T5更厚之 偏厚護套構造。在該實施形態中’使設置2條抗張力體7A 、7B的部位之護套厚度T5爲最薄，朝向與前述狹孔溝3的 開口部5對向的部位慢慢使其護套厚度變厚，並使與該開 -9 - 201140184 口部5對向的部位之護套厚度T4爲最厚。 該護套6係藉由以利用聚乙烯樹脂被覆已收納光纖2之 狹孔芯部4的周圍整體之方式形成的押出成形加以形成。 在成形時’以塞住前述開口部5的方式添設用以使聚乙嫌 樹脂不會擠進狹孔溝3內之按壓帶8。 如此所構成的光纖纜線1係根據形成在狹孔芯部4的狹 孔溝3與護套6的偏厚護套構造’當在纜線施加彎曲時會從 纜線剖面的中心點C更爲內側朝中心彎曲。爲了防止該變 形，使2條抗張力體7Α、7Β的長度有所差異（線長度差） 另一7Α 比力體 成張力 設加張 度施抗 長邊條 的一 ί 體在 力並 張短 抗更 的者 方或 一 長 將更 度 0 f 甲 4 長 ί 部的揭 芯體部 孔力芯 狹張孔 在抗狹 設的行 埋方進 並 一 邊 等 此 設 m 二 埋 時 形 成 出 如以上所構成的光纖纜線1係例如在第3圖所示之閉合 構件9內，連接相互的光纖2、2時，利用夾持模具1 0夾持 固定光纖纜線1本身及從狹孔溝3拉出的抗張力體7。夾持 模具1 〇係如第4圖所示，具有夾持固定纜線本身之纜線支 撐部11、及夾持固定抗張力體7之抗張力體夾持部12。 纜線支撐部1 1係由從基底部1 3垂直立起之垂直部1 4、 從該垂直部Μ的前端呈直角彎曲而形成與基底部13平行之 水平部15、安裝在與水平部15螺合之螺絲16的前端之上護 套夾持部17Α、及安裝在與基底部13螺合之螺絲的前端之 下護套夾持部17Β構成。 上護套夾持部17Α與下護套夾持部！7Β係設置在上下的 -10- 201140184 相互對向之位置，挾入前述光纖纜線1的護套6部位並予以 夾持固定。上護套夾持部1 7 A係藉由旋轉與前述水平部1 5 螺合的螺絲16而在對於另一方的下護套夾持部17B爲接近/ 分離的方向上下移動。下護套夾持部17B係藉由旋轉與前 述基底部13螺合的螺絲18而在對於上護套夾持部17A爲接 近/分離的方向上下移動。 抗張力體夾持部1 2係由從在光纖纜線1的軸線上延伸 之基底部1 3的前端垂直立起的立起部1 9、開設在該立起部 19之抗張力體插入孔20、及夾持固定被插入到抗張力體插 入孔20內的抗張力體7 ( 7A、7B )之夾緊螺絲21構成。 抗張力體插入孔20係設成可以插入至少並列2條抗張 力體7 ( 7A、7B )的尺寸之開口並貫穿前述立起部19加以 形成。在該抗張力體插入孔20中係成爲使與立起部19的前 端螺合之夾緊螺絲2 1的前端部2 1 A露出。當旋轉夾緊螺絲 21時’會增減在抗張力體插入孔20突出之前端部21A的突 出量。又夾持模具1 0係與未圖示的部位接地連接，並與插 入到前述抗張力體插入孔2〇的抗張力體7導通。藉此，抗 張力體7係藉由利用夾持模具1 〇予以夾持固定而成爲接地 〇 在利用如此所構成的夾持模具丨〇夾持固定光纖纜線i 的端末部時’首先將從狹孔芯部4取出的2條抗張力體7A、 7B插入前述抗張力體插入孔20。又旋轉上下的螺絲16、18 使上護套夾持部1 7 A與下護套夾持部丨7B相互接近的方式移 動’利用此等上護套夾持部17A與下護套夾持部17B挾入護 -11 - 201140184 套6。 藉由鎖緊前述上下的螺絲1 6、1 8，利用上護套夾持部 1 7 A與下護套夾持部17B使前述護套6不會搖動的方式加以 夾持固定。其次，旋緊夾緊螺絲2 1，利用其前端部2 1 A將2 條抗張力體7A、7B按壓在抗張力體插入孔20的底面20a。 在本實施形態中，因爲將2條抗張力體7A、7B形成成 爲相同尺寸且相同剖面形狀，因此使前述夾緊螺絲2 1的前 端部21A與此等抗張力體7A、7B均勻接觸。換言之，夾緊 螺絲2 1的前端部2 1 A係不會發生與任何一方的抗張力接觸 但不與另一方的抗張力體接觸的狀態。又在此等兩抗張力 7A、7B中係均勻承受來自前述夾緊螺絲21的按壓力。 根據本實施形態之光纖纜線，因爲在利用根據部位使 護套厚度不同之偏厚護套構造的護套6予以被覆之狹孔芯 部4 ’設置呈相同尺寸且相同剖面形狀之2條以上的抗張力 體7(7A、7B) ’當利用設置在閉合構件9內之夾持模具10 夾持此等抗張力體7時，由於全部的抗張力體7(7A、7B) 爲相同尺寸且相同剖面形狀，因此可以利用夾持模具1 〇均 勻夾持固定全部抗張力體7 ( 7A、7B )。其結果爲，不須 要所謂在對於夾持模具1 〇之纜線的安裝作業時考量纜線的 方向性才進行作業之煩雜作業的同時，而且可以確實取得 全部的抗張力體（7A、7B )之接地。 又根據本實施形態之光纖纜線，因爲將2條抗張力體 7A、7B設置爲相互接近，因此易於將此等抗張力體7A、 7B插入到夾持模具10的抗張力體插入孔20。 -12- 201140184 又根據本實施形態之光纖纜線，因爲將狹孔芯部4之 設有抗張力體7A、7B的部份之厚度ΤΙ、T2、T3設成比其 他部位的厚度更薄，因此易於從狹孔芯部4拉出抗張力體 7A、7B。換言之，爲了取出抗張力體7A、7B易於剝掉狹 孔芯部4。 (實施例） 比較在將2條的抗張力體7 A、7 B之直徑差（線徑差） 變小時之在閉合構件9內之根據夾緊螺絲2 1的夾持力偏差 、與導通性作爲實施例。在表1顯示其結果。 〔表1〕 試作品1 試作品2 試作品3 試作品4 線徑差 -50% -32% -15% 同徑 夾持力偏差 ±10kgf ±8kgf ±5kgf ±3kgf 導通性 3/10 5/10 8/10 10/10 試料係在將單邊的抗張力體之直徑成爲1.4mm的情況 下，將線徑差-50%者成爲試作品1、將線徑差-32%者成爲 試作品2、將線徑差-1 5 %者成爲試作品3、將同徑者成爲試 作品4。夾持力係利用kgf加以表示，導通性係以在夾持模 具夾持10次抗張力體時取得導通的條數/試驗條數加以表 示。 其結果爲’線徑差變大之試作品1程度係在夾持力產 生偏差的同時’而且導通性也變差’但是在成爲同徑的抗 -13- 201140184 張力體之試作品4中，得到夾持力的偏差爲少而且導通性 也佳之結果。 以上，雖然是針對適用本發明之具體的實施形態加以 說明，但是本發明係不限於上述的實施形態。例如在前述 中，雖然是以在閉合構件9內利用夾持模具1 0夾持固定光 纖纜線1的抗張力體7爲例，但是在被用於光網路構築之光 終端盒內利用夾持模具1 〇夾持固定抗張力體7的情況也可 以適用本發明。 (產業上的可利用性） 本發明係可以利用於在狹孔芯部具有2條以上的抗張 力體之光纖纜線。 【圖式簡單說明】 第1圖係顯示本實施形態之光纖纜線，其爲在切除一 部份的護套之狀態的立體圖。 第2圖係爲本實施形態之光纖纜線的剖面圖。 第3圖係爲顯示在閉合構件內直線連接本實施形態的 光纖纜線時的樣態之槪略圖。 第4圖係顯示利用設置在閉合構件內之夾持模具夾持 固定從光纖纜線取出的抗張力體及光纖纜線的狀態，（A )爲其側面圖，（B )爲其正面圖。 第5圖係爲顯示利用夾持模具固定直徑不同的2條抗張 力體的狀態之習知構造的圖面。 -14- 201140184 【主要元件符號說明】 1 :光纖纜線 2 :光纖 3 :狹孔溝 4 :狹孔芯部 5 :開口部 6 :護套 7、7A、7B :抗張力體 8 :按壓帶 9 :閉合構件 1 〇 :夾持模具 1 1 :纜線支撐部 1 2 :抗張力體夾持部 1 3 :基底部 1 4 :垂直部 1 5 :水平部 1 6、1 8 :螺絲 17A :上護套夾持部 17B :下護套夾持部 1 9 :立起部 20 :抗張力體插入孔 20a :底面 2 1 :夾緊螺絲 -15 201140184 2 1 A :前端部 101、102:抗張力體 1 0 3 :插入孔 1 〇 4 :固定螺絲 1 〇 5 :夾持模具 C :纜線剖面的中心點 T1、T2、T3:狹孔芯部厚度 Τ4、Τ5 :護套厚度 -16-BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber optic cable in which an optical fiber is housed in a narrow-core core portion provided with two or more tensile-resistant bodies and covered with a sheath, and more particularly to It is possible to obtain a configuration of a fiber optic cable in a state in which the tension member of the closing member is held in a stable state. [Prior Art] The optical fiber cable is generally constituted by a slit core having a slit groove in which the optical fiber is housed, and a sheath formed to have a thick structure around the periphery of the slit core. In the optical fiber cable, according to the thick-thickness structure of the slit groove formed in the core of the slit and the sheath, when the cable is bent, the inner side which is more curved than the central axis of the cable section is centered. The way the cable is deformed. In order to prevent this deformation, a tensile body of two tension members is embedded in the slit core portion (for example, as described in Patent Document 1). This type of optical fiber cable is required to be removed from the core of the slot core in a closed member for protecting the connection portion of the fiber optic cable or the box of the excess length portion from water or external force. The tensile body is stable and fixed. In the closing member, for example, as shown in FIG. 5, by inserting two tension-resistant bodies 1 0 1 and 102 in the insertion hole 103 and clamping by the fixing screws 1 〇 4, the tension-resistant body 101 is clamped and fixed, The clamping die 105 of 102. PRIOR ART DOCUMENT PATENT DOCUMENT PATENT DOCUMENT 1: Japanese Patent Laid-Open Publication No. 2008-A. No. 2,086 - 0,7,8,9,9, 7,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the case of the two large-diameter members 101 and 102, the tension-resistant body 101 having a large diameter can be fixed by the fixing screw 104, but the small-diameter body 102 having a small diameter is fixed and fixed. A gap is formed between the screws 104 to be fixed or the fixing force is weakened. For this reason, when the tension members 1 and 102 having different diameters are used, the fixing screws 104 cannot be used to uniformly sandwich the two, and the clamping force is varied, and the tension of the one of the tension members 102 cannot be obtained. The situation. When the diameters of the two tension-resistant bodies 101 and 102 are different, it is necessary to pay attention to the directionality of the cable while fixing by the fixing screw 104, and when the tension-resistant bodies 101 and 102 are taken out from the core of the slit hole. Although the tensile body is easy to remove, the other tensile body is difficult to remove. Accordingly, the present invention has been made in an effort to provide a fiber optic cable which can uniformly hold and fix all of the tensile members. (Means for Solving the Problem) The optical fiber cable of the present invention is characterized in that it includes a slit core portion for accommodating the optical fiber in the slit and supporting the narrow portion of the opening including the slit groove In the sheath of the entire core portion, the sheath type -6-201140184 is formed to be thicker than the thickness of the sheath opposite to the side of the opening from the thickness of the sheath facing the opening side of the slit groove. In the thick-walled sheath structure, at least two or more tensile members having the same size and the same cross-sectional shape are provided in the slit core portion. It is preferable that the aforementioned tension-resistant systems are disposed close to each other. The thickness of the portion where the above-mentioned tensile body of the slit core portion is provided may be made thinner than the thickness of the other portion. (Effect of the Invention) The optical fiber cable according to the present invention is provided in the same size and the same sectional shape as the slit core portion which is covered with the sheath having a thicker sheath structure having different sheath thicknesses depending on the portion. When the tension-resistant body is held by the holding mold provided in the closing member, since all the tension-resistant bodies have the same size and the same sectional shape, the entire tensile strength can be uniformly clamped and fixed by the clamping mold. body. As a result, it is not necessary to carry out the troublesome work of the cable in consideration of the directionality of the cable in the mounting work for the cable for holding the mold, and it is possible to surely obtain the grounding of all the tension-resistant bodies, and the core of the narrow-hole core The removal of the tensile body can also be easily performed. [Embodiment] (Embodiment for Carrying Out the Invention) Hereinafter, a specific embodiment to which the present invention is applied will be described in detail with reference to the drawings. 201140184 Fig. 1 is a perspective view showing a state in which a fiber optic cable of the present embodiment is cut out of a sheath, and Fig. 2 is a cross-sectional view showing the optical fiber cable of the embodiment. The optical fiber cable 1 of the present embodiment is a slit core portion 4 in which the optical fiber 2 is housed in the slit 3 and supported, as shown in Figs. 1 and 2, and an opening 5 including the slit 3 is covered. The sheath 6 of the slit core is integrally formed. In the optical fiber 2, an optical fiber bus, an optical fiber core, an optical fiber ribbon, or the like is used. The optical fiber bus is a person who is coated with an ultraviolet curing resin on the optical fiber. The optical fiber core is a plastic resin coated on the optical fiber to have a larger diameter than the optical fiber bus. The optical fiber ribbon is a parallel of a plurality of optical fiber bus bars and is covered with an ultraviolet curing resin. In the first and second figures, a plurality of sheets (6 sheets) of the optical fiber ribbon are housed in the narrow groove 3 by using an optical fiber ribbon. An interference material may be interposed between the optical fiber 2 and the narrow groove 3 to make it a void. The slit core portion 4 is a support member that accommodates and supports the optical fiber 2, and has a slit groove 3 formed in a circular arc centering on a position deviated from the center point C of the optical fiber cable 1. The slit core portion 4 is formed by extrusion molding, and a cross section perpendicular to the longitudinal direction thereof is formed into a C-shaped cross-sectional shape. The slit core portion 4 has an uneven thickness, and gradually increases its thickness from a portion where the opening portion 5 is formed toward a portion opposite to the opening portion. In the case of the opposite view, the slit core portion 4 is gradually thinned from the portion corresponding to the bottom portion of the slit groove 3 toward the portion where the opening portion 5 is formed. Further, in order to suppress the heat shrinkage of the sheath due to the heat received at the place where the optical fiber cable 1 is laid, etc., the sheath of the optical fiber cable 1 itself is deformed, and the tension member is embedded in the slit core portion 4. 2 anti-tension bodies 7 (7A, 7B). The tensile body 7 is made of, for example, a steel wire or a wire material such as FRP. In the present embodiment, the two tension members 7A, 7B are of the same size and the same cross-sectional shape. As far as the same dimensions are defined herein, in addition to being completely identical without errors, a slight error (error of about ± 0.03 mm) is also included. Similarly, in terms of the same cross-sectional shape, in addition to being identical, a slight error is included. In Figs. 1 and 2, a steel wire of the same diameter having a circular cross-sectional shape is used as the tensile body 7. In the present embodiment, the number of the tension-resistant members 7 is two, but it is not necessary to provide three or more. The two tension members 7A and 7B are provided on the same straight line passing through the center point C of the optical fiber cable 1 and corresponding to the position of the bottom portion of the slit groove 3. For this reason, the thickness of the portion of the slit core wire 4 where the tension-resistant bodies 7A, 7B are provided is set to be thinner than the thickness of the other portions. For example, in the portion of the slit core portion 4, the thickness T1 of the slit core between the two tension members 7A and 7B, the thickness T2 of the slit core between the one tensile member 7A and the slit 3, and the other The thickness T3 of the slit core between the tension body 7B and the sheath 6 is set to be much thinner than the thickness of any other portion. The sheath 6 is formed to have a thicker sheath structure in which the sheath thickness T4 opposed to the opening portion 5 side of the slit groove 3 is thicker than the sheath thickness T5 on the side opposite to the opening portion 5 side. In this embodiment, the sheath thickness T5 of the portion where the two tension members 7A and 7B are provided is the thinnest, and the thickness of the sheath is gradually increased toward the portion facing the opening 5 of the slit groove 3. And the sheath thickness T4 of the portion facing the mouth portion 5 of the opening -9 - 201140184 is the thickest. The sheath 6 is formed by extrusion molding in which the entire circumference of the slit core portion 4 of the optical fiber 2 is covered with a polyethylene resin. At the time of molding, a pressing belt 8 for preventing the polyethylene resin from being pushed into the slit 3 is provided so as to close the opening 5. The optical fiber cable 1 thus constructed is based on the thick-walled sheath structure formed by the narrow groove 3 and the sheath 6 formed in the slit core portion 4, and is more from the center point C of the cable profile when the cable is bent. Bend for the inside toward the center. In order to prevent this deformation, the lengths of the two tension-resistant bodies 7Α and 7Β are different (the line length difference) and the other 7Α is the tension of the force body and the tension is applied to the long side of the long-side strip. The more square or the longer one will be more 0 f A 4 long ί The part of the core body of the core of the core is narrowed in the anti-seated line and the other side is formed when the m is buried. The optical fiber cable 1 is, for example, in the closing member 9 shown in FIG. 3, and when the optical fibers 2 and 2 are connected to each other, the optical fiber cable 1 itself is clamped and pulled out from the narrow groove 3 by the clamp mold 10. Anti-tension body 7. The clamp mold 1 has a cable support portion 11 for holding and fixing the cable itself, and a tension body holding portion 12 for holding and fixing the tension member 7, as shown in Fig. 4. The cable support portion 1 1 is formed by a vertical portion 14 that is vertically raised from the base portion 13 , and is bent at a right angle from the front end of the vertical portion 而 to form a horizontal portion 15 that is parallel to the base portion 13 and is attached to the horizontal portion 15 . The front end of the screw 16 is provided with a sheath holding portion 17A and a sheath holding portion 17A that is attached to the front end of the screw that is screwed to the base portion 13. Upper sheath clamping portion 17Α and lower sheath clamping portion! The 7-inch system is placed at the position of the upper and lower -10-201140184, and is inserted into the sheath 6 of the optical fiber cable 1 and clamped and fixed. The upper sheath holding portion 1 7 A is moved up and down in the direction of approaching/separating to the other lower sheath holding portion 17B by rotating the screw 16 screwed to the horizontal portion 15 . The lower sheath holding portion 17B is moved up and down in a direction approaching/separating from the upper sheath holding portion 17A by rotating the screw 18 screwed to the base portion 13. The tension body holding portion 1 2 is a rising portion 19 that is vertically erected from a front end of the base portion 13 extending on the axis of the optical fiber cable 1, and a tension body insertion hole 20 that is opened in the rising portion 19, And a clamp screw 21 that clamps and fixes the tension-resistant body 7 (7A, 7B) inserted into the tension-resistant body insertion hole 20. The tension body insertion hole 20 is formed so as to be insertable through at least the opening of the size of the two tensile members 7 (7A, 7B) and penetrates through the rising portion 19. In the tension body insertion hole 20, the front end portion 2 1 A of the clamp screw 2 1 screwed to the front end of the rising portion 19 is exposed. When the clamp screw 21 is rotated, the amount of protrusion of the end portion 21A before the tension body insertion hole 20 is protruded is increased or decreased. Further, the clamp mold 10 is grounded and connected to a portion (not shown), and is electrically connected to the tension body 7 inserted into the tension body insertion hole 2''. Thereby, the tension-resistant body 7 is clamped and fixed by the clamping die 1 to be grounded. When the end of the optical fiber cable i is clamped by the clamping die thus constructed, the first will be narrow. The two tension members 7A and 7B taken out from the core portion 4 are inserted into the above-described tension body insertion hole 20. Further, the upper and lower screws 16 and 18 are rotated so that the upper sheath holding portion 17A and the lower sheath holding portion 7B are close to each other. The upper sheath holding portion 17A and the lower sheath holding portion are used. 17B 挟入护-11 - 201140184 Set 6. By tightening the upper and lower screws 16 and 18, the upper sheath holding portion 17A and the lower sheath holding portion 17B sandwich and fix the sheath 6 so as not to be shaken. Next, the clamp screw 2 1 is tightened, and the two tension members 7A and 7B are pressed against the bottom surface 20a of the tension body insertion hole 20 by the front end portion 2 1 A. In the present embodiment, since the two tension members 7A and 7B are formed to have the same size and the same cross-sectional shape, the front end portion 21A of the clamp screw 2 1 is brought into uniform contact with the tension members 7A and 7B. In other words, the front end portion 2 1 A of the clamp screw 2 1 does not come into contact with any one of the tension-resistant members but does not come into contact with the other tensile-resistant body. Further, in the two-resistance tensions 7A, 7B, the pressing force from the aforementioned clamp screw 21 is uniformly received. According to the optical fiber cable of the present embodiment, two or more of the same size and the same cross-sectional shape are provided in the slit core portion 4' which is covered by the sheath 6 having a thicker sheath structure having different sheath thicknesses depending on the portion. Tension-resistant body 7 (7A, 7B) 'When the tension-resistant body 7 is held by the holding mold 10 provided in the closing member 9, since all the tension-resistant bodies 7 (7A, 7B) are the same size and the same sectional shape Therefore, the entire tension-resistant body 7 (7A, 7B) can be uniformly held by the holding mold 1 〇. As a result, it is not necessary to carry out the troublesome work of the cable in consideration of the directionality of the cable when the cable for clamping the mold 1 is mounted, and it is possible to surely obtain all the tension-resistant bodies (7A, 7B). Ground. According to the optical fiber cable of the present embodiment, since the two tension members 7A and 7B are disposed close to each other, it is easy to insert the tension members 7A and 7B into the tension body insertion hole 20 of the clamp mold 10. -12- 201140184 According to the optical fiber cable of the present embodiment, since the thicknesses T, T2, and T3 of the portions of the slit core portion 4 where the tensile-resistant bodies 7A and 7B are provided are made thinner than the thickness of other portions, It is easy to pull the tension-resistant bodies 7A, 7B from the slit core portion 4. In other words, the slit core portion 4 is easily peeled off in order to take out the tension-resistant bodies 7A, 7B. (Example) The difference in the clamping force according to the clamp screw 2 1 and the continuity in the closing member 9 when the diameter difference (wire diameter difference) between the two tension members 7 A and 7 B was reduced was measured. Example. The results are shown in Table 1. [Table 1] Test works 1 Test works 2 Test works 3 Test works 4 Wire diameter difference -50% -32% -15% Same diameter clamping force deviation ±10kgf ±8kgf ±5kgf ±3kgf Continuity 3/10 5/10 8/10 10/10 When the diameter of the unilateral tension-resistant body is 1.4 mm, the difference between the wire diameter difference of -50% is the trial work, and the difference of the wire diameter is -32%. The difference of -5 5 % is the trial work 3, and the same diameter is the trial work 4. The gripping force is expressed by kgf, and the conductivity is expressed by the number of strips/test strips obtained when the gripping mold is held 10 times. As a result, in the case of the test piece 1 in which the difference in the wire diameter is large, the degree of the clamping force is different, and the conductivity is also deteriorated, but in the test piece 4 of the tensile body of the anti--13-201140184 which is the same diameter, The result is that the deviation of the clamping force is small and the conductivity is also good. The above is a description of specific embodiments to which the present invention is applied, but the present invention is not limited to the above embodiments. For example, in the foregoing, the tension member 7 that holds and fixes the optical fiber cable 1 by the clamp mold 10 in the closing member 9 is taken as an example, but the clamp is used in the optical terminal box used for optical network construction. The present invention can also be applied to the case where the mold 1 is clamped and fixed to the tensile body 7. (Industrial Applicability) The present invention can be applied to an optical fiber cable having two or more tensile strength members in a slit core portion. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the optical fiber cable of the present embodiment in a state in which a part of the sheath is cut off. Fig. 2 is a cross-sectional view showing the optical fiber cable of the embodiment. Fig. 3 is a schematic view showing a state in which the optical fiber cable of the present embodiment is linearly connected in the closing member. Fig. 4 is a view showing a state in which the tension-resistant body and the optical fiber cable taken out from the optical fiber cable are held by a holding mold provided in the closing member, (A) is a side view thereof, and (B) is a front view thereof. Fig. 5 is a view showing a conventional structure in which two tension members having different diameters are fixed by a clamp mold. -14- 201140184 [Explanation of main component symbols] 1 : Optical fiber cable 2 : Optical fiber 3 : Narrow hole 4 : Slot core 5 : Opening 6 : Sheath 7, 7A, 7B : Tension body 8 : Pressing belt 9 : closing member 1 〇: clamping mold 1 1 : cable support portion 1 2 : tensile body holding portion 1 3 : base portion 1 4 : vertical portion 1 5 : horizontal portion 1 6 , 1 8 : screw 17A : upper guard Nesting portion 17B: Lower sheath holding portion 19: Upright portion 20: Tension-resistant body insertion hole 20a: Base surface 2 1 : Clamping screw -15 201140184 2 1 A : Front end portion 101, 102: Tension-resistant body 10 3 : Inserting hole 1 〇 4 : Fixing screw 1 〇 5 : Clamping mold C : Center point T1, T2, T3 of cable cross section: Spiral core thickness Τ 4, Τ 5 : Sheath thickness - 16-