DRAG EMBEDMENT ANCHORS 



Anchor Descriptions (Refer to 

 Ogg, 1969; Valent et al., 1976) 



1. Standard Drag Anchor 



- Significant portion of 

 anchor capacity generated 

 by anchor wt. 



- Full embedment- rare. 



- Develops peak capacity 

 with minimal drag. 



(o) STOCK (ADMIRALTY) ANCHOR 

 KEDGE TYPE 



\2T57 



(c) MUSHROOM ANCHOR - 

 REINFORCED CONCRETE 



Anchor 



Veight (Air) 

 (lb) 



Weight (Wet) 

 (lb) 



Average Lateral Load 

 Capacity (lb) 



Length of Drag (ft) 



50 



100 



150 



Wedge 

 cand 

 ■ud 



10,580 



6,000 



25,000 

 9,300 



27,300 

 11,900 



27,500 

 11,700 



Hucbrooa 

 sand 

 aud 



10,500 



6,000 



21,300 

 9,100 



23,000 

 10,000 



21,600 

 13,300 



(b) MUSHROOM ANCHOR (d) PEARL HARBOR CONCRETE ANCHOR 



Sondud Dn| Ancfaon. 



2. Standard Burial Anchor 



- Achieves most of capacity as 

 a result of soil shear ^ 

 strength. 



- Designed to improve their 

 capacity through dragging 

 to cause embedment to deeper, 

 stronger soil. 



- Most anchors in this category 

 fabricated according to rules 

 of geometric similarity where 

 dimensions are proportional 

 to (weight) 



Standard burial anchor per- 

 formance is idealized below. 



i"! = fluke angle I 

 a = shank angle * + 

 6 - line angle 



crown shank ^ 



fluke 7 !_ 



% TflUNION 



-STABIUZER 



FLUK£ STIFPENEU 



•0 ron uuD •OTTOM orcttA-rioN 



STATO Hoorlni Anchor 



\ \ 



a. placed on seaf loor b. flukes keylns c. in dense/itiff teafloor d. in soft seafloor 



into seanoor o-=+0Oto1B° a — -20° to -45° 



17 



