Grain Systems Bin Accessories PNEG-318 - Manual (Page 128)

17. Concrete Foundation Commercial Hopper Tanks
128 PNEG-318 Concrete Foundation Recommendations for GSI Grain Bins
18' Diameter Commercial Hopper Tank Foundation up to 12 Rings
Figure 17E
NOTES: 1. T
h
e
foun
dation
d
e
sign
i
s
ba
sed
on a mini
mu
m al
lowa
ble soil
b
earin
g
cap
a
city o
f 3
000
PSF
.
Bearin
g cap
a
city
of th
e soi
ls sho
u
ld
be d
e
termined
by g
eotechn
ical
in
vesti
gation
a
nd be of uniform beari
ng cap
a
ci
ty
.
2. T
h
e
foun
dation
si
te
must b
e
fr
ee
o
f vege
ta
tio
n
and de
bris and
well
d
ra
ine
d.
3. T
h
e
foun
dation
must
be
found
ed
bel
ow
th
e frost line
o
r
con
s
tructed on
non
-e
xp
ansive
frost free
fill.
4.
Al
l ma
te
ri
al used
for backfill
in
si
de the ring
wa
ll shou
ld be clea
n,
we
ll
grade
d,
crushe
d rock
o
r a san
d
-grave
l
mixture. Ba
ckfil
l shoul
d be pla
c
ed
in 6" lif
ts
, 95% comp
action
.
5.
Al
l re
inforcemen
t must
mee
t th
e requi
rement
s
o
f ASTM A615 grad
e 60
deformed ba
rs.
6.
L
ap al
l
ci
rcu
m
fere
nti
a
l bars 35 ba
r
di
ameters
a
nd st
a
gge
r al
l lap
s
in
plan
s 3
'-0"
.
Esti
ma
te
s
do
n
o
t in
clude
e
nd
lap
s
.
7. C
oncrete
must
ha
ve a
min
imum
co
mp
ressive stre
ngth of
3
000 PSI at
28 days, 6%-8% air en
trai
nment,
4
"
slu
m
p.
8.
C
odes: UBC 97,
ACI 318
-9
5.
9. Interio
r top
sla
b
ma
y
be
crow
ned
2"
to
provid
e
water d
raina
ge
awa
y
from found
ation. Crow
ni
ng
the
slab
wi
ll
reduce
the
cle
a
rance
un
der
th
e discharg
e
.