Screw (Auger) Anchor 



-One or more 

 helices screwed 

 into the ground 

 from surface or 

 at seafloor. 



•=i^ 



AugcT pin uiehot. 



Jetted-In Anchors 



"1^ 



PERIPHERAL JETS 



ilKd 



xtmxIpj^TTT 



Hydropin Anchor (National 

 Eng. Lab. U.K.) 



Plate Anchor Failure Definitions 



Vibrated Anchor 



Anchor at base of long 

 slender shaft, vibrated 

 into the seafloor; plate 

 is "keyed" to operating 

 position. 



SrrTLEO SANO 



WATER- 1 ^ 



,-^ 



LUG FOR BSIDLE 



PLATE 

 BOLTED TO 

 ANCHOR — 



CEMENT 



I 

 „ , PJLLING LfS-E 



Royal Dutch shell jetted 

 anchor (Netherlands) 



l(2k) 



Plate Anchor Design Loading Conditions 



Static 



Short-Term Loading - An increasing load to failure such that 

 in fine-grained soils drainage does not occur. 



Long-Term Loading - Uniform static load where full drainage 

 occurs . 



