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RELIEVING RINGS
A relieving ring represents an integral part of each sewage manhole installed in a road. This element protects a manhole form a direct vehicle attack and, as a result, prevents sewage system connection elements from being damaged. Relieving rings are manufactured as precast-reinforced concrete elements in six DN diameters. Table 10 includes DN details.
Table 10
Relieving rings technical data (for U and P-W manhole types)
|
Item
|
Diameter size
mm
|
Manhole DN
mm
|
D z
(external) mm
|
D w
(internal) mm
|
H
mm
|
Masa
kg
|
| 1 | 1220/250/1620 P-W | 1000 | 1620 | 1220 | 250 | 450 |
|
2
|
1330/250/1720 U
|
1000
|
1720
|
1330
|
250
|
480
|
| 3 | 1440/250/1840 P-W | 1200 | 1840 | 1440 | 250 | 550 |
|
4
|
1530/250/1930 U
|
1500
|
2140
|
1530
|
250
|
580
|
| 5 | 1740/250/2140 P-W | 1500 | 2140 | 1740 | 250 | 650 |
|
6
|
1830/250/2230 U
|
1500
|
2230
|
1830
|
250
|
710
|
