Grain Systems Bin Accessories PNEG-318 - Manual (Page 144)

144 PNEG-318 Concrete Foundation Recommendations for GSI Grain Bins
18. Frost Free Foundation 4.00" FCHT Hopper Tanks
18' Diameter FCHT Hopper Tank Foundation
Figure 18A
NOTES: 1.
T
he foun
dation
d
e
sign
is ba
se
d on a minimum all
o
wab
le soil
b
earin
g
ca
p
a
city of 3
000
PSF
.
Be
aring
cap
a
city
of
th
e soi
ls shou
ld b
e
d
e
termi
ned
b
y
g
eotechn
ical inve
stig
ation an
d be of
u
n
iform
b
earin
g cap
a
ci
ty
.
2. T
he
foun
dation
site
must b
e
fr
ee
of vege
ta
tio
n
a
nd de
bris and
w
e
ll dra
ined
.
3.
T
he foun
dation
must be fo
und
ed bel
ow
th
e frost line
o
r con
s
tructed on
n
on-e
x
p
ansive
frost free
fill.
4.
All
materi
al used for backfill in
si
de the ring wa
ll shoul
d be clea
n,
we
ll
g
rade
d, crushe
d ro
ck
or a sand
-gravel mixture.
Ba
ckfil
l
sh
ould
b
e
place
d
in 6" lif
ts
,
95% comp
action.
5.
All
re
inforcement must meet th
e
re
quire
me
nt
s of ASTM
A6
15 grad
e 60
d
e
formed bars.
6.
L
ap all
circumferen
ti
a
l bars 35 ba
r di
ameters
a
nd st
a
gger all
l
a
p
s
in
p
lan
s
3'
-0". Estimates do
no
t in
cl
ude
en
d lap
s
.
7.
Co
ncrete mu
st ha
ve
a
min
imum
co
mp
re
ssive stren
g
th of 30
00 PSI at
2
8
days,
6
%
-8% air entrai
n
ment, 4"
slu
m
p
.
8. Co
des:
UBC 9
7
, ACI
318-9
5
.
9.
Interio
r top slab
may be
crown
ed 2" to provide
w
a
ter
d
ra
ina
ge awa
y
from fo
und
ati
on. Crowni
ng th
e sl
ab wil
l re
duce
the clea
rance un
der
the
d
ischarge
.