iiiPill 



i iiiij 



drilled ' 



Wlfiil 



lateral extension branches 

 activated by vertical down- 

 ward force on center member 





(a) Mechanical System 



iiililiPiilillii 



ii Wisiiiiiii 



ut 



> 



i 



i i 



(b) Lateral Extension Branches System 



I 



activated lateral extension 

 branches force pile out and 

 into wall of the hole 



ilPpl j 



expandable helically-screwed 

 system activated by rotary 

 table 



(c) Helically-Screwed System 



Figure 28. Conceptual drawing of a pressurized pile - Alternate A. 



73 



