Duckbill Anchor Sizes




Mechanical Anchor Soil Mechanics Capacity Chart (kN)

Common Soil Type
Description
Geological Soil
Classification
Blow Count or 'SPT' AS10 AS20 AS100 AS140 AS200 AS300
Very Dense and/or Cemented Sands; Coarse Gravel & Cobbles Caliche, Nitrate-Bearing Gravel 60-100+ 10 20 100 140 200 300
Dense Fine Sand; Very Hard Silts & Clays Basal Till; Boulder Clay Cliche 45-60 10 20 90 140 200 285
Dense Clays, Sands and Gravels; Very Stiff to Hard Silts & Clays Glacial Till; Weathered Shales; Schist Gneiss Silltstone 35-50 10 20 90 140 200 270
Medium Dense Sandy Gravel; Very Stiff to Hard Silts & Clays Glacial Till; Hardpan 25-40 8 18 70 110 150 220
Medium Dense Course Sand and Sandy Gravel; Stiff to Very Stiff Silts & Clays Saprolites; Residual Soils 14-25 8 16 70 110 150 210
Loose to Medium Dense Fine to Coarse Sand; Firm to Stiff Clays & Silts Dense Hydraulic Fill; Compacted Fill; Residual Soils 7-14 7 16 60 70 110 190
Loose Fine Sand; Aluvlum; Soft-Firm Clays; Varied Clays; Fill Flood Plain Soils; Lake Clays; Adobe; Gumbo Fill 4-8 7 14 50 60 80 150
Peat, Organic Silts; Inundates, Silts Fly Ash Miscellaneous Fill: Swamp Marsh 0-5 5 12 40 50 20-50 20-80

NB: For guidance purposes only - True Capacity must be tested with Anchor Locker.

Tests have conclusively shown that if an anchor is grouted into poor ground, the results achieved are very good. Details are available on request.


Note: All underground work requires proper safety and location procedures. Do not install an anchor until you know what is below the surface. It is imperative in all cases that all anchors are fully load locked before being put into service.