Undersea cable, multilayer tape for water shielding layer of undersea cable, and method for improving fatigue characteristics of undersea cable

摘要

A power line core in an undersea cable includes a conducting member, an insulating member, a shield layer, a water shielding layer, an anticorrosion layer and the like. The insulating member is provided on an outer periphery portion of the conducting member. The insulating member is made of, for example, crosslinked polyethylene. The shield layer is provided on an outer periphery of the insulating member. The water shielding layer is provided on an outer periphery portion of the shield layer. The water shielding layer includes a multilayer tape in which a metal layer is sandwiched by resin layers. The anticorrosion layer is provided on an outer periphery portion of the water shielding layer. In the cross section of the multilayer tape, the metal layer has a corrugated shape.

主权项

1. An undersea cable for offshore floating facilities, comprising at least:
a power line core in which an insulating layer, a shield layer, a first water shielding layer, and an anticorrosion layer are formed on a conductor; a wire armor member formed by providing, on an outer periphery side of the power line cores as a whole, a plurality of wire rods in a circumferential direction of the outer periphery of the power line cores, and arranging the plurality of wire rods helically in an axial direction of the power line cores; and an outer anticorrosion layer formed on an outer periphery side of the wire armor member, wherein the first water shielding layer is formed using a multilayer tape in which a metal layer is sandwiched by resins, wherein a cross sectional shape of the metal layer of the multilayer tape is a convex-concave shape, and wherein the convex-concave shape of the metal layer is formed such that on a plane surface of the multilayer tape, mountain portions or valley portions of the convex-concave shape are alternately and continuously repeated toward two different directions.