Grain Systems Bin Accessories PNEG-318 - Manual (Page 125)

17. Concrete Foundation Commercial Hopper Tanks
PNEG-318 Concrete Foundation Recommendations for GSI Grain Bins 125
12' Diameter Commercial Hopper Tank Foundation for 13-17 Rings
Figure 17B
NOTES: 1
.
Th
e
fou
nda
ti
on
desig
n
is b
a
sed
on
a
min
imum a
llow
able
so
il
bea
ri
ng
cap
a
city
of
300
0 PSF
. Beari
ng ca
p
a
city of the
soils sh
ould
be
determine
d
by geo
te
ch
nical
i
n
vestigatio
n and be
o
f uni
fo
rm be
aring
cap
a
city
.
2
. Th
e fou
nda
ti
on site
mu
st be fre
e
of
veg
e
ta
ti
on an
d
d
ebris an
d
wel
l drain
ed.
3
. Th
e fou
nda
ti
on must be
foun
ded
b
e
low the frost lin
e or co
nstru
c
te
d
o
n
no
n-exp
a
n
s
ive frost free
fil
l.
4
. All material
use
d
fo
r ba
ckfil
l
in
side
the
rin
g
wall
sho
u
ld be
cl
ean, well
grad
ed, cru
s
hed rock or
a
sa
nd-grave
l mi
xture
. Backfill shou
ld be pl
aced
in
6"
l
if
ts,
95%
comp
a
c
tio
n
.
5
. All rein
fo
rce
m
e
n
t
must
me
et t
he requ
irement
s of
AST
M A615
g
rade 60
deformed bars.
6
.
Lap
a
ll
circumfe
rential
b
a
rs 3
5
b
a
r diameters and
st
agg
er
a
ll lap
s
in
pl
ans
3'
-0
". Estimates d
o
not i
n
clud
e
end
la
p
s
.
7
. Con
c
re
te
must
h
a
ve a minimum compressive strength of 3000
PSI
a
t
28
da
ys,
6%-8%
a
ir e
n
tra
inmen
t,
4"
slump.
8
. Cod
e
s: UBC 97, ACI 31
8-95.
9
. In
te
rior to
p
sl
ab may
b
e
cro
w
ned
2
" to pro
v
ide water drai
nage
a
w
ay
fro
m
foun
dation
. Crow
ning
the sla
b
will red
u
ce th
e cl
earan
ce unde
r
the discha
rge.