JPS6258411U

JPS6258411U -

Info

Publication number: JPS6258411U
Application number: JP14892585U
Authority: JP
Priority date: 1985-10-01
Filing date: 1985-10-01
Publication date: 1987-04-11

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の構造を示す図、第
２図は本考案の自己支持形光フアイバケーブルを
説明するための図、第３図は第２図をＡの方向か
ら見た図、第４図はケーブル伸び歪と光フアイバ
ユニツト伸び歪の関係を計算した結果を示す図、
第５図、第６図はケーブル伸び歪と光フアイバユ
ニツト伸び歪の関係の計算結果と測定結果を示す
図、第７図はケーブルの最大歪を０．２％とした
ときの押え巻きによつて光フアイバユニツトに加
わる押え力ｆと光フアイバユニツトの撚りピツチ
ｐの関係を求めるチヤート、第８図は従来の自己
支持形光フアイバケーブルの断面図、第９図は従
来の自己支持形光フアイバケーブルの架渉後の温
度―伸び歪特性を示す図、第１０図は従来の自己
支持形光フアイバケーブルの温度変化に伴うコア
移動の測定結果を示す図である。１…支持線、２…外被、３…ケーブルコア、４
…ケーブルコア中心材、５…光フアイバユニツト
、５′…光フアイバユニツト５の位置、６…押え
巻き、７…ケーブルコア中心材を展開したもの、
８…ケーブルコア中心材の円周×ｎ、９…光フア
イバユニツトの撚りピツチ×ｎ、１０，１１，１
２，１３…それぞれｆ＝１，５，１０，２０Kg／
ｍとしたときの計算値、１４…計算値、１５…測
定値、１６，１７，１８，１９，２０…ユニツト
の許容歪ε_ｃが０．００５，０．０１，０．０２
，０．０４，０．０８％の場合の計算値。 Fig. 1 is a diagram showing the structure of an embodiment of the present invention, Fig. 2 is a diagram for explaining the self-supporting optical fiber cable of the present invention, and Fig. 3 is a view of Fig. 2 from the direction A. Figure 4 shows the results of calculating the relationship between cable elongation strain and optical fiber unit elongation strain.
Figures 5 and 6 are diagrams showing the calculation and measurement results of the relationship between cable elongation strain and optical fiber unit elongation strain, and Figure 7 is a diagram showing the results of pressure winding when the maximum strain of the cable is 0.2%. Figure 8 is a cross-sectional view of a conventional self-supporting optical fiber cable, and Figure 9 is a diagram of a conventional self-supporting optical fiber cable. FIG. 10 is a diagram showing the temperature-elongation strain characteristics of the cable after it is strung, and is a diagram showing the measurement results of core movement associated with temperature changes of a conventional self-supporting optical fiber cable. 1...Support wire, 2...Sheath, 3...Cable core, 4
... Cable core center material, 5... Optical fiber unit, 5'... Position of optical fiber unit 5, 6... Presser winding, 7... Cable core center material unfolded,
8... Circumference of cable core center material x n, 9... Twisting pitch of optical fiber unit x n, 10, 11, 1
2, 13...respectively f=1, 5, 10, 20Kg/
Calculated value when m is calculated, 14... Calculated value, 15... Measured value, 16, 17, 18, 19, 20... Unit allowable strain ε _c is 0.005, 0.01, 0.02
, 0.04, 0.08%.

Claims

[Scope of Claim for Utility Model Registration] A plurality of optical fiber units constructed by twisting a plurality of optical fiber cores in one direction around a central unit material, and arranging a buffer layer and a unit presser winding around it in a cylindrical shape. The book is placed around the center material of the cable core with radius r (mm), the number of reversal cycles is n,
The cable core is twisted while reversing the twisting direction every n cycles, and the cable core is made up of a cable core presser winding around it.The cable core and support wire are arranged parallel to each other at regular intervals, and both are bundled with plastic material such as polyethylene. In a self-supporting optical cable made of a coated optical fiber, the unit pressing force f (Kg/mm) due to the cable core pressing and winding and the twist pitch p (mm) of the optical fiber unit are equal to E (Kg/mm ² ), which is equivalent to the unit Young's modulus, A (mm ² ) is the cross-sectional area of the unit,
A self-supporting optical cable characterized by satisfying the following relationship, where ε _s is the maximum strain applied to the cable and ε _c is the allowable elongation strain of the unit.