80 
CONCRETE SILOS 
Concrete Chutes 
A permanent chute of concrete is a valuable adjunct to any concrete 
or masonry silo. The same arguments presented for the concrete silo 
stand for the chute. The concrete chute is substantial and permanent, 
fireproof and cold-proof, and it greatly improves the appearance of the silo. 
Chutes in use in various parts of the country vary in size from 2 feet 
square to about 5 feet square (inside dimensions), but the former size is 
Size of much too small and the latter larger than need be. For the aver- 
Chute age silo a chute 21^2 feet by 3 feet in inside dimensions is recom- 
mended. The outer dimensions will then be 33^ feet by 43^ 
feet, the walls being 6 inches thick. A monolithic chute of this size will 
require one sack of cement, cubic feet of sand and 4 cubic feet of 
gravel, per foot of height. For the block silo, the size should be such as 
will be accommodated by whole and half blocks. The outer dimensions 
of a hollow block chute (using 8x8x1 6-inch blocks) should be 2 feet 8 
inches by 5 feet 4 inches, making the inside dimensions 2 feet by 4 feet. 
This size will require an average of 73^ blocks for each course. 
The foundation for the chute should be 2 feet wide and 1 foot high, 
the same as that for the silo, using concrete of the same proportions. 
Foundations ^^^^ P^S© 83.) If a monolithic chute is to be built 3^-inch verti- 
cal reinforcing rods must be imbedded in the foundation 18 
inches apart. Monolithic chute walls are built simultaneously with 
Form for Monolithic Chute. 
