| 摘要 |
PROBLEM TO BE SOLVED: To provide an FRP made tension member which is hardly broken when it is bent by a large radius. SOLUTION: A cable 1 is provided with a coated optical fiber 2, coated tension members 3 and a messenger wire 4. Each of the coated tension members 3 is formed into a flat rectangular cross section in which a fiber-reinforced thermosetting resin made tension member 5 is coated by a thermoplastic resin coating layer 6. A pair of the coated tension members 3 is arranged coaxially above and below the coated optical fiber 2 at prescribed intervals to interpose the coated optical fiber 2 therebetween. As a reinforcing fiber of the tension member 5, an appropriate one is selected from the followings, for example, aramid fiber, polyarylate fiber and polyparaphenylene benzobisoxazole (PBO) fiber or the like provided that the elastic modulus in tension is equal to or greater than 360 cN/dtex and the degree of stretching at the breaking point is equal to or greater than 3.5%. COPYRIGHT: (C)2005,JPO&NCIPI
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