Type MB Manhole
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| STRUCTURE
NAME |
Type
MB Manhole |
| STRUCTURE
CATEGORY |
Stormwater |
| |
|
| SPECIFICATIONS |
|
source
|
DM
Urban Standard |
concrete
|
4000
psi |
reinforcing
|
DM
Urban Standard |
| |
|
| DESCRIPTION |
|
inside
dimension
|
pipe size inside
diameter (inches)
|
minimum inside
dimension (inches)
|
54
|
72
|
48
|
64
|
42
|
56
|
36
|
56
|
30
|
48
|
24 or less
|
40
|
none
|
40
|
|
wall
thickness
|
6" |
lid
thickness
|
9" |
| |
|
| STRUCTURE
COMPONENTS |
|
a.
|
Manhole casting
and cover |
b.
|
Adjustment rings:
2-4-6" |
c.
|
Lid |
d.
|
Base section
with floor & pipe openings |
|
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