86 



SILOS OTHER THAN WOOD. 



be in the way in raising the forms. The size and spacing of hori- 

 zontal reinforcing needed for silos is shown in tables reproduced 

 herewith from Wisconsin Bulletin No. 214. 



Table VIM. Amount of Reinforcement Needed for Silos. 



Size and Spacing of Horizontal Reinforcement Around Silo. 



Vertical Reinforcement. 



Figure 29 illustrates how a very satisfactory continuous door- 

 way can be made by forming concrete jambs on both sides of the 

 opening, with a recess on inner side for the 2-inch plank doors to 

 fit against. The forms for these jambs should be erected between 

 the inner and outer forms of the silo wall, and it will be seen that 

 the 1-inch ladder rounds form the binder or horizontal reinforcing 

 across the door opening and should be in position and twisted 

 around the vertical reinforcing rod. Spacers consisting of 2x4's 

 at intervals of two feet, will hold the jamb forms apart rigidly 

 and prevent them from bulging from the pressure of the concrete. 



