Grain Systems Bin Accessories PNEG-318 - Manual (Page 155)

19. Commercial Tank Foundation Tunnels
PNEG-318 Concrete Foundation Recommendations for GSI Grain Bins 155
6' Wide Tunnels
85' Maximum Sidewall Height (32 Rings 2.66" Corrugation) 3000 PSI
Concrete at 28 Days ASTM A615 Grade 60 Deformed Reinforcement Bar
1. Lap all bars 35 bar diameters and stagger all laps in plan 3'-0".
2. Material estimates are approximations only. Estimates do not include allowances for reinforcement
bar overlaps, concrete shrinkage or material waste.
3. Reference drawing 6' WIDE TUNNEL DETAILS ( Pages 156-158 ) for construction details and
drawing FND-0001 for rebar/beam details.
4. Concrete should have a minimum compressive strength of 3000 PSI at 28 days.
5. Based on a soil bearing capacity of 4500 PSF.
* When a tunnel is added to the inverted “T” foundation, increased stemwall height is required in
all cases. The footer must be kept below the frost line to minimize movement.
32 Ring 4000 PSF
Diameter #4 Rebar #5 Rebar #6 Rebar Concrete
Tunnel
Depth *
Slope
Length
Ft. Ft. Lbs. Ft. Lbs. Ft. Lbs. Yd^3
33 2400 1602 800 834 1300 1953 41 3'-6" 18"
36 2600 1737 900 939 1400 2103 45 3'-6" 18"
42 3100 2071 1100 1147 1700 2553 53 3'-8" 18"
45 3300 2204 1100 1147 1800 2704 57 3'-9" 18"
48 3500 2337 1200 1252 1900 2853 60 3'-10" 18"
54 4000 2671 1400 1460 2100 3154 68 4'-0" 18"
60 4500 3005 1600 1669 2400 3604 76 3'-11" 18"
72 5400 3606 1900 1984 2800 4205 92 4'-2" 18"
75 5600 3739 2000 2088 2800 4205 94 4'-2" 14"
78 5800 3873 2100 2192 3000 4505 99 4'-3" 14"
90 6800 4540 2500 2610 3400 5106 114 4'-5" 14"
105 7900 5275 3000 3132 4000 6007 135 4'-8" 14"