Manhole Concrete Casting Quantity
a — inner length
(cm)
b — inner width
(cm)
c — bottom slab length
(cm)
d — bottom slab width
(cm)
m — top slab length
(cm)
n — top slab width
(cm)
h — inner height
(cm)
k — top slab thickness
(cm)
r — bottom slab thickness
(cm)
t — wall thickness
(cm)
Blinding gap
(cm)
Blinding thickness
(cm)
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