I have never thought about the fact that manholes need to hold up to weight. Of course they do and it’s perfectly normal and sensible. It’s just not a thought I’ve ever had.
Structures underground experience buoyant forces that act to push them up. Manholes (and any structure bottom, like storm inlets, pump station wet wells, etc) need special consideration since they can be partially or mostly hollow, so they have to be heavy enough to remain in place.
For formula one races they weld them down to stop the cars incredible downforce from sucking them up into the air. Even then they sometimes get torn up and thrown around.
Manhole covers are also a common exercise for engineering students. Like designing one that can hold x amount of weight with a specific set of limitations and/or requirements.
I have never thought about the fact that manholes need to hold up to weight. Of course they do and it’s perfectly normal and sensible. It’s just not a thought I’ve ever had.
Technically it’s the manhole covers that need to support the weight.
Manholes themselves are expected to do the opposite of holding weight
They hold light?
It’s dark inside so of course the light is held □
Structures underground experience buoyant forces that act to push them up. Manholes (and any structure bottom, like storm inlets, pump station wet wells, etc) need special consideration since they can be partially or mostly hollow, so they have to be heavy enough to remain in place.
You know, I knew that but couldn’t figure out what the opposite of weight was for some reason. Thanks for the extra learning!
Fun fact: Coffins experience this force too, and during flooding can rise up out of the ground
For formula one races they weld them down to stop the cars incredible downforce from sucking them up into the air. Even then they sometimes get torn up and thrown around.
Very important to take them seriously.
Manhole covers are also a common exercise for engineering students. Like designing one that can hold x amount of weight with a specific set of limitations and/or requirements.