Item to compare |
COD |
PVC |
Remarks |
1
|
Installation in 1 time
|
1 installation between
2 manholes |
To connect numerous
6 meter long ducts |
|
2
|
Installation duration
|
Not more than 2 hours
for 1,000 meters
after excavation |
Need tremendous
hours to connect 6 meter
long individual duct |
|
3 |
Coupler |
No need |
Need in every 6 meters |
|
4
|
Coupling accessories &
consumables |
No need
|
Need in every 6 meters
|
|
5 |
Trench Depth |
Min. 30 Cm |
120 Cm |
|
6 |
Trench Width |
30Cm~50Cm Vertical |
Approx. 150Cm Slope |
Open cut |
7
|
Cleaning of Installed Duct
|
No need
|
Need cleaning &
Need inspection upon
completinn of coupling |
|
8
|
Inspection of Air Tighness
|
No need
|
Need inspection upon
completinn of coupling |
|
9 |
Sand bedding & Padding |
Very limited |
Need to protect duct |
|
10 |
Trench Refill |
To use excavated soil |
Need borrowed soil |
|
11 |
Disposal of excavated soil |
Not much |
All |
|
12
|
Mobilization of material
|
1 mobilization only
|
1 mobilization for ducting
1 mobilization for inner
duct insertion |
Possibly additional
1 more for
cleaning & inspection |
13
|
Insertion of Inner Duct
|
Absolutely no need
|
To insert after completion
of Ducting |
|
14
|
Numbers of inner duct
insertion |
100% of inner dimension
of Duct (as built product) |
60~65% of inner
Dimension of Duct |
|
15
|
Alignment of inner duct
Insertion of cable
|
Perfect
Up to 80% of
Inner diameter |
Twist or loose
Approx. 50% of inner
diameter |
|
16
|
Curving of Duct Line
|
Self curving
|
Need special bending or
need extra manhole |
|
17 |
Traffic trouble |
Light |
Very heavy |
|
