To allow for any differential settlement between manhole and pipeline, short lengths of either spigot/socket butt pipes should be built into the manhole wall. A rocker pipe should then be laid connecting the short spigot/socket butt pipe to the incoming/outgoing pipe run, thereby incorporating a flexible joint close to the manhole.
Short length pipes (spigot or socket butts)
short length pipes for entry or exit to a manhole are available in the tabled standard lengths. |
Rocker pipes (joint both ends)
rocker pipes are available cast monolithically |
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Nominal size |
Effective length |
DN |
m |
225 - 600 |
0.60 |
675 - 825 |
1.00 |
900 and above |
1.25 |
|
Nominal size |
Effective length |
DN |
m |
225 - 600 |
0.60 |
675 - 750 |
1.00 |
825 and above |
1.25 |
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