FOUNDATIONS FOR BLOCK SILOS. 



101 



reinforcement across door opening. L, M, N and O, P, Q show 

 two types of door jambs and regular blocks put out by another 

 manufacturer. N indicates the vertical reinforcement next to 

 the door around which the wall reinforcing steel is placed. The 

 galvanized iron tie R for the door opening is shown in position 

 on top of the block O. 



Tile below ground 

 line to be set on 

 end and. filled 

 vVith concrete 



A 'ar G'Concnebe rtoor 



-T . . i Ji . *i. > '. , ; f7 



^^Z+*. -M _ 



Cinder filling pnd tile drain. if necessary 



Fig. 44. Showing two methods of preparing the founda- 

 tion for clay block silos. (Courtesy Iowa Experiment 

 Station.) 



The Iowa silo is a hollow clay tile silo that was designed by the 

 Agricultural Engineering section of the Iowa Station. It is 

 very popular as it does not require special blocks. The Iowa 

 Silo is simple in construc- 

 tion, durable, efficient and 

 reasonably cheap where the 

 tile can be obtained. It is 

 built of regular clay hollow 

 building blocks similar to 

 those shown in the illustra- 

 tion of Figure 47. The tile 

 are laid in cement mortar 

 which contains just enough 

 lime to make the mortar stick 

 well (one part cement, one- 

 third part lime, two to three 



parts sand). Number three 



Fig. 46. Clay block silo 

 foundation. (Nebraska 

 Bulletin No. 138.) 



