UNIVERSAL PORTLAND CEMENT CO. 
63 
Doorways 
There has been considerable discussion as to the kind of doorway best 
adapted to concrete silos. This is solely a matter of preference. Both 
types have their advocates and advantages, but primarily care should 
be exercised to see that the doorways are made in such a manner as to al- 
low the doors to fit tightly so that they will be practically airtight. 
Continuous and non-continuous doorways are used about equally in 
monolithic silo construction and the question of which one to use is gener- 
ally settled by personal choice. The continuous doorway has the advantage 
of providing a larger space through which to throw the silage and for this 
reason is preferred by many. The non-continuous doorways, as used by 
some of the best contractors, have no disadvantage except they provide a 
smaller space through which to remove the silage. 
A' satisfactory continuous doorway can be made by forming concrete 
jambs on both sides of the opening. This is easily accomplished by in- 
Continuous ^^^t^'^S between the forms, at proper distances apart, vertical 
Doorways wooden forms to mold the face of the jamb and the recesses into 
which the doors will fit. Where the concrete chute is built sim- 
ultaneously with the silo walls, the vertical jamb forms will extend from 
the inner wall form to the inner chute form as shown on page 81. If the 
silo walls are constructed without the chute, the jamb forms must be 
placed between the inner and the outer wall forms. 
/■ bar cot/ere e/ by 
Method of Placing Reinforcement in Monolithic Concrete Silo and Building Continuous Doorway. 
The rod reinforcement and method of tying at the silo doorway are shown at the left. Triangle mesh 
reinforcement and method of tying at doorway is shown on the right. 
