Depends. The cover is resting on the inside lip which prevents moisture getting in. Ie. this cover is actually significantly bigger than the hole it’s covering.
Eg. if this cover is 25x25, but it’s covering a hole which is less than 18x18 (c=25.5), it’ll be quite hard to drop the cover in.
I think you’re misunderstanding. Yes, it cannot fit in when it’s angled properly to fit into the hole. However, if you angle the plate 45 degrees and lift one end of the plate, it will fall into the diagonally. That’s why manholes are round shaped. There is no angle for a round cover to fall into the hole itself.
There’s a risk that if you try to turn the square cover that the cover will fall into the hole. It’s really strange that it’s square and not round.
That’s not how geometry works
Yes it is
Yes it is.
Depends. The cover is resting on the inside lip which prevents moisture getting in. Ie. this cover is actually significantly bigger than the hole it’s covering.
Eg. if this cover is 25x25, but it’s covering a hole which is less than 18x18 (c=25.5), it’ll be quite hard to drop the cover in.
The problem is the hole is smaller than the cover. If they were the same size it would fall though
I think you’re misunderstanding. Yes, it cannot fit in when it’s angled properly to fit into the hole. However, if you angle the plate 45 degrees and lift one end of the plate, it will fall into the diagonally. That’s why manholes are round shaped. There is no angle for a round cover to fall into the hole itself.
You are right, never mind. I was thinking Pythagorean theorem
It’s not even slightly strange. These are incredibly common all across Europe and the world.
It’s a small cover, almost certainly to service the nearby drainpipe or perhaps for the water or gas connection to a house.
The chance of it falling in the hole is zero unless you’re trying to do it on purpose. Lift and slide, done.
And even if it does fall in, you can simply reach in and pull it out.
I’m pretty sure the reason is that the hole isn’t deep enough for it to matter. That’s nowhere near big enough to be a manhole.