Archive image from page 17 of Deep ocean cable burial concept. Deep ocean cable burial concept development deepoceancablebu00rock Year: 1976 Figure 2. Trencher modified for shallow-water coral trenching. The disadvantages associated with plowing center on the high force required to penetrate the soil, both vertically and horizontally. In order to effect initial plow penetration, and to keep the plow in the soil, ocean plow machinery has been very heavy (19 to 23 tons). To support the plow on the seafloor, large skids are used. The skid drag coupled with the force required to plow can be as h
Archive image from page 17 of Deep ocean cable burial concept. Deep ocean cable burial concept development deepoceancablebu00rock Year: 1976 Figure 2. Trencher modified for shallow-water coral trenching. The disadvantages associated with plowing center on the high force required to penetrate the soil, both vertically and horizontally. In order to effect initial plow penetration, and to keep the plow in the soil, ocean plow machinery has been very heavy (19 to 23 tons). To support the plow on the seafloor, large skids are used. The skid drag coupled with the force required to plow can be as high as 100,000 pounds. Since deep-ocean plowing systems are towed from the surface, the high towing force, high weight, and slow speed of operation impose requirements on the surface support ship that are not easily met. The high drawbar pull requirement was recognized as a problem for land cable plows when the undergrounding of services for older residential communities was increasing Tractors, required because of their high drawbar pull capability, caused surface damage which had to be repaired. Analytical and experimental in- vestigation of vibrating the plowshare showed that up to a 99 reduction in drawbar pull could be achieved [6-14], allowing the use of smaller, rubber-tired machines. Roughly half of the total power requirement is supplied to vibrate the plow, and the other half for running the machine. This approach worked well on experimental plows, and now most major equip- ment manufacturers supply vibratory plow equipment. To date, vibration has not been employed for deep-ocean plows. Water Jetting Water jetting is used mainly for burying offshore oil pipelines. The jetting machine straddles the pipeline and extends into the seafloor 10
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