112 Concrete Silos 



pipe in the door post. A 16-foot silo, 30 feet high, 

 should have at least 150 pounds of additional wire 

 reinforcement. Since the pressure is much greater at 

 the bottom, gradually decreasing toward the top of the 

 silo, a larger amount of the wire should be placed in 

 the lower part of the wall. The table shows the cor- 

 rect spacing of the wires in a 16-foot silo below. The 

 loops attached to the gas-pipe to which these wire 

 strands are later to be fastened should be placed in 

 accordance with this table, and may be put in place 

 at the time at which the lath is being tacked to the 

 studding, or just before the plastering begins. 



Table showing proper spacing of extra wire reinforcement for 

 silo 16 feet in diameter. 



Feet from top Number of strands of 



of silo No. 9 wire required. 



0- 4 1 strand for every 24 inches. 



4- 8 1 strand for every 24 inches. 



8-12 1 strand for every 24 inches. 



12-16 1 strand for every 12 inches. 



16-20 2 strands for every 12 inches. 



20-24 2 strands for every Sy 2 inches. 



24-28 2 strands for every 6 % inches. 



28-32 2 strands for every 5 inches. 



32-36 2 strands for every 4 inches. 



Silos of larger size will require one additional 

 strand of No. 9 wire for every 2 foot increase in 

 diameter. 



After the metal lath and the wire loops are in place, 

 the thin boards, K, should be nailed in place, care being 

 taken to press the edge as tightly as possible against 

 the lath, since this box is to be later filled with mor- 

 tar. Plenty of nails should be used to hold these 

 boards, but the heads should be left slightly out so 

 that they may easily be drawn later. If this precau- 

 tion is not taken, some difficulty may be experienced 

 in removing this board when the proper time comes. 



