Regarding non-standard manholes
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During the design process, the issue of raising manholes often arises. What do you think is the maximum height to which they can be raised? What is the highest height of manholes that has actually been achieved in practice?
Elevating the manhole does not constitute a non-standard manhole; it is simply a matter of lengthening the manhole cylinder section. As for how high it can be raised, whether there are any impacts depends on the specific circumstances.
For example, can the cylinder section of the underground tank manhole (DN500) be raised to H1=1800mm?
If you think the transportation is no problem, then there’s nothing wrong with it. Are there any other impacts?
There is no problem with raising the manhole itself; for horizontal containers, raising the manhole means an additional concentrated load, which should be taken into account during calculations
No problem; we have manufactured several buried tanks, with the manhole height being around 1800. The manhole sections are extended, and reinforcing plates are added around them.
Manufacturing should not be a problem, but in practice, how can people who are 1800 tall get in and out of such manholes? Are there any safety hazards?
It may be necessary to raise the manhole. As long as it meets the safety calculations, that’s fine