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REDUCING COVERS
Reduction covers are manufactured as precast-reinforced concrete elements in four DN diameters: DN 1200, 1500, 2000, 2500 mm. They are indented for the reduction of manhole chamber diameter to the diameter of a manhole.
All sizes of reducing covers are manufactured as U type elements (seal joint) and P-W type (tongue and groove joint).
Table 8
Reducing cover technical data – elements joined by a seal (U type)
|
Item
|
Manhole DN
mm
|
Size
|
D z
mm
|
D w
mm
|
d opened
mm
|
H
mm
|
m
mm
|
s
mm
|
k
mm
|
d
zew
|
Mass
kg
|
| 1 | 1200 | 1470/1000 | 1470 | 1320 | 1000 | 155 | 170 | 80 | 65 | 1320 | 487 |
|
2
|
1200
|
1500/1000
|
1500
|
1320
|
1000
|
155
|
170
|
80
|
65
|
1320
|
532
|
| 3 | 1500 | 1800/1000 | 1800 | 1620 | 1000 | 175 | 170 | 90 | 65 | 1620 | 940 |
|
4
|
2000
|
2300/1000
|
2300
|
2120
|
1000
|
175
|
170
|
90
|
65
|
2120
|
1973
|
| 5 | 2500 | 2800/1000 | 2800 | 2620 | 1000 | 175 | 170 | 90 | 65 | 2620 | 3126 |
Drawing with symbols:
- Wwew = Dw
- Dzew =Dz
Table 9
Reducing cover technical data – elements joined by a tongue and groove joint (P-W)
|
Item
|
Manhole DN
mm
|
Size
|
D z
mm
|
d opened
mm
|
H
mm
|
m
mm
|
h
mm
|
Mass
kg
|
| 1 | 1200 | 1400/1000 | 1400 | 1000 | 150 | 170 | 40 | 276 |
|
2
|
1500
|
1700/1000
|
1700
|
1000
|
150
|
170
|
40
|
547
|
| 3 | 2000 | 2200/1000 | 2200 | 1000 | 175 | 170 | 40 | 1113 |
|
4
|
2500
|
2700/1000
|
2700
|
1000
|
175
|
170
|
40
|
1825
|
