JETTED-IN MARINE ANCHORS

Twenty-three lightweight anchors consisting of a 10-foot X 2 1/2-inch pipe with a metal cone welded at the tip end were emplaced and tested in twenty-five feet of water at Lameshur Bay, St. John, U. S. Virgin Islands. The anchors were jetted into the coral sand bottom by forcing water through the pipe and out an aperture in the cone. Two divers guided the anchors into the sediment using the jet of water to excavate the soil beneath the cone. Four of the anchors were emplaced with a cement slurry to increase the holding power. It was found that the emplacement procedures were straightforward and posed no problems to the divers. However, the injection of the cement slurry was very time- consuming due to numerous problems. The pullout results and theoretical analysis showed the jetted anchors to be capable of developing 2,000 to 10,000 lbs holding capacities in the soil at the test site. The holding capacity may be increased by increasing any of the following: anchor cone diameter ( area ), emplacement depth, compaction of the overburden sediment, or use of a cement slurry. Tests indicate that the use of these light weight jetted-in anchors may be of practical use where bottom tie-downs and light anchorages are required. Further testing is recommended. ( Author )

• Corporate Authors:

  Naval Civil Engineering Laboratory

  Port Hueneme, CA  United States 
• Authors:
  • Stevenson, H S
  • Venezia, W A
• Publication Date: 1970-2

Media Info

• Pagination: 49 p.

Subject/Index Terms

• TRT Terms: Anchors (Structural connectors); Offshore moorings
• Uncontrolled Terms: Anchors
• Old TRIS Terms: Anchor structures
• Subject Areas: Marine Transportation; Terminals and Facilities;

Filing Info

• Accession Number: 00005622
• Record Type: Publication
• Source Agency: National Technical Information Service
• Files: TRIS
• Created Date: Nov 25 1972 12:00AM