Composite overhead cable structure for electric and optical transmission

A composite overhead cable structure comprising:

• a pipe having a length and an outer peripheral wall and an inner peripheral wall;
• at least one layer of stranded metallic elongated conductor surrounding the outer peripheral wall of said pipe in close contact with said outer peripheral wall;
• an optical fiber cable having an outer peripheral wall and being disposed within and extending throughout the length of said pipe;
• and,
• tightly disposed within and extending throughout the length of an elongated space defined by the inner peripheral wall of said pipe and the outer peripheral wall of said optical fiber cable and superposed on the outer peripheral wall of said optical fiber cable, a packing comprised of at least one double packing layer of a non-metallic soft packing layer having a Young's modulus of 0.01 to 5 Kg/mm.sup.2 and a non-metallic rigid packing layer having a Young's modulus of 20 to 400 Kg/mm.sup.2 arranged in this order, said non-metallic rigid packing layer being contiguous to said non-metallic soft packing layer;
• said packing having its innermost and outermost layers which are composed of a non-metallic soft packing layer and a non-metallic rigid packing layer, respectively;
• said innermost layer being in close contact, at its surface, with the outer peripheral wall of said optical fiber cable and said outermost layer being in close contact, at its surface, with the inner peripheral wall of said pipe;
• thereby providing fixed package of said optical fiber cable in said pipe through said packing.