Cable for fastening structures and method of detecting damage to

Details Cable for fastening structures and method of detecting damage to Cable for fastening structures and method of detecting damage to

1985-10-31

1987-08-04

Taylor, Dennis L.

Hydraulic and earth engineering

Marine structure or fabrication thereof

With anchoring of structure to marine floor

324 65R, 405195, E02D 574

Patent

active

046842934

ABSTRACT:
A structure fastening cable has a strand of a large number of metal element wires and a corrosion-preventive layer. The cable also has a cylindrical conductive resistance detector that extends inside and over the entire length of the cable in such a manner as to surround the strand with an insulating layer in between and a device to measure the resistance of a circuit composed of the strand, resistance detector and insulating layer. The resistance detector consists of a cylinder element of metal sheet or spirally wound metal ribbon. The measuring device is inserted in a circuit that connects an end of the strand to an end of the resistance detector at one end of the cable. When the corrosion-preventive layer breaks, seawater enters the reaches the peripheral surface of the strand to establish an electrical connection between the strand and resistance detector via the penetrated seawater, with a resulting sharp reduction in the resistance between the strand and resistance detector. This drop in resistance indicates the presence of a damage in the corrosion-preventive layer, and the amount of a change in resistance indicates the size of the damaged area.

REFERENCES:
patent: 3358229 (1967-12-01), Collins
patent: 3382493 (1968-05-01), Loper et al.
patent: 3721898 (1973-03-01), Dragoumis et al.
patent: 3721970 (1973-03-01), Niemoth
patent: 4285615 (1981-08-01), Radd
patent: 4301399 (1981-11-01), Miller et al.
patent: 4404516 (1983-09-01), Johnson

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