Accession Number : AD0746843

Title :   Emplacement of a Heavy Load Onto a Seafloor Foundation: Concept Development and Analysis.

Descriptive Note : Final technical rept. Oct 70-Aug 71,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Wilson,J. V. ; Hitchcock,R. D. ; Mittleman,J. R.

Report Date : JUL 1972

Pagination or Media Count : 84

Abstract : Emplacement of a heavy load by cable from the surface onto a seafloor foundation in the deep ocean to an accuracy of 1 foot may require a secondary positioning system to supplement the basic ship's stationkeeping. Four possible systems to effect this control are thrusters mounted just above the load, four-point moor with winches mounted above the load, single-point moor with one winch, one thruster, and a rudder, and hauldown system with load-mounted winch. Analysis of load/cable dynamics and operational considerations show that for emplacement of heavy loads (20 to 100 tons), thrusters of 1,000 to 2,000 pounds thrust would be needed, or submersible winches of 5,000-pound capability, or a hauldown winch of 10,000-pound capacity at a constant tension. (Author)

Descriptors :   (*POSITIONING DEVICES(MACHINERY), PERFORMANCE(ENGINEERING)), (*FOUNDATIONS(STRUCTURES), OCEAN BOTTOM), FOUNDATIONS(STRUCTURES), UNDERWATER, MOORING, MECHANICAL CABLES, LOADS(FORCES), NUMERICAL ANALYSIS

Subject Categories : Construction Equipment, Materials & Supplies
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE