Helical Anchors: A Sustainable Solution for Our Waterways-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes a two-phase floating-dock project and the use of helical anchors for mooring. Phase 1 uses concrete anchoring; Phase 2 uses helical anchors. Estimated forces on the dock include wave, wind, and current loads. The Phase 1 total is 15.73 kN (3,536 lb), while the Phase 2 total is 29.88 kN (6,717 lb). For Phase 1, the presentation calculates a required mooring-line force of 34.61 kN (7,781 lb), accounting for the mooring line’s horizontal and vertical angles.<br /><br />The presenters highlight helical anchors’ predictable capacity, ability to carry high loads, and adaptability to site conditions through choices such as shaft length, helix configuration, steel strength, and finish. A Vineyard Haven pull-test comparison reports 20,800 lb of breakout force for an 8- or 10-helix anchor in soft clay and mud, compared with 1,700–3,200 lb for several conventional mushroom or concrete anchors in sand or mud. The presentation also notes that concrete anchors can slide on sloped bottoms and may require costly transport, replacement, or adjustment.<br /><br />Environmental considerations include protecting freshwater mussels and other habitat, reducing construction impacts, and identifying opportunities to support LEED credits. The materials reference a geotechnical carbon calculator and goals to cut Scope 1 and 2 emissions by 30%, water use by 25%, and hazardous waste by 30% by 2030. The presentation also encourages donations to the Wild Mile.

Keywords

floating dock

helical anchors

mooring loads

concrete anchoring

wave load

wind load

current load

pull-test comparison

environmental impact

LEED credits