Grain Systems Bin Accessories PNEG-318 - Manual (Page 145)

18. Frost Free Foundation 4.00" FCHT Hopper Tanks
PNEG-318 Concrete Foundation Recommendations for GSI Grain Bins 145
21' Diameter FCHT Hopper Tank Foundation
Figure 18B
NOTES: 1.
The
fou
ndatio
n
desig
n i
s
b
a
sed
on
a
mini
mu
m al
lowa
ble
soi
l b
earin
g
cap
a
ci
ty o
f 3
000
PSF
. Bearin
g cap
a
city of the so
ils sho
u
ld
be
determine
d
by geotech
n
ical
in
vesti
gation
a
nd be of uniform bea
ri
ng cap
a
city
.
2.
The
fou
ndatio
n
si
te
must b
e
fr
e
e
o
f vege
ta
ti
on and
d
ebris and
well
d
ra
ine
d.
3. The
fou
ndatio
n mu
st be found
ed be
lo
w the fro
s
t lin
e
o
r
con
s
tructed
o
n
non
-e
xp
ansi
v
e
frost free
fill
.
4. Al
l ma
te
rial used
for backfill
in
si
de
the ring
w
a
ll shou
ld be cle
an,
w
e
ll
grade
d, crush
ed
rock o
r a
san
d
-grave
l
mixture. Backfi
ll shoul
d be pla
c
ed
in 6" li
ft
s, 95% comp
actio
n
.
5. Al
l reinforcemen
t must
mee
t t
he requi
rement
s
o
f ASTM A615 gra
de 60
deformed ba
rs.
6. Lap al
l ci
rcu
m
fere
ntial ba
rs 35
ba
r
d
iameters and st
a
gge
r
al
l lap
s
in
pla
n
s 3
'-0"
.
Esti
ma
te
s do
n
o
t i
n
clud
e e
nd
lap
s
.
7. Concrete must
ha
ve a mi
nimum co
mpressive stre
ngth of
3
000 PSI
a
t
28 da
ys, 6%-8% ai
r en
tra
inment,
4
"
sl
ump.
8. Code
s: UBC 97,
AC
I 318
-95.
9.
In
teri
or top
sla
b
ma
y b
e
cro
w
ned
2"
to
provid
e
water
drain
age
aw
ay
fro
m
found
ation
. Crown
ing the slab
wi
ll
redu
ce
the
cle
a
rance
u
nder
th
e discha
rg
e
.