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[Phreck]

I'm building a floor to get to the other side of some open space, with a river running about 6 z-levels down.  Is it possible this will collapse?  Is there something I can do to ensure it won't?  Thanks!

[Shiv]

Wont' collapse so long as one part of it is touching land.  'It' being the entire set of floors.  If just one floor is attached to a wall/land/whatever then it'll stay up.  Doesn't count for diagonals though. 

Dwarf Fortress: defying physics one tile at a time.

[NecroRebel]

They will collapse only if they're unsupported. The other floors, connected to the walls of the canyon, provide support to the ones in the middle. So, unless you actually deconstruct the floors on the edges or channel out the walls and floors there, it won't collapse.

Cave-ins are not particularly realistic. You can have a 10,000 ton fort held up only by a single slender wooden support or floor, leverage and weight considerations be damned. Usually, when you're building constructions, you won't cause cave-ins unless you do it on purpose. Digging is only somewhat more likely to cause cave-ins.

[Intelligent Shade of Blue]

 
 
  Wait... you don't want it to collapse?
 
There's no such thing as structural integrity   in DF, except for wear & tear on equipment.

[Phreck]

Ok cool, thanks for the answers.  I like the place I've embarked and didn't want to build something that might make half my dwarves die in a cave in or something.  My map has a river that flows down 6 z-levels as a waterfall into that much larger chasm you see.  It's quite interesting and I plan on using water diverted from the rivers as water traps to keep the nasties out.

[se5a]

Note that if you build a floor or wall next to a grate, the dwarf will build it, then the floor  will promptly collapse, taking the dwarf down with it.
=O
+#+

If you do something like this though:
==O
+#+

it will stay.
short story, grates do not support walls and floors built next to them.

[Quatch]

Grates also do not support grates. I lost a few good dwarves working on the cistern that I was trying to grate-over.

[Lytha]

 
 
  Wait... you don't want it to collapse?
 
There's no such thing as structural integrity   in DF, except for wear & tear on equipment.

Deconstructing all these floor tiles at once will lead to prematurely dropping dwarves though: they love to stand on floor tiles that are in the process of deconstruction, and so they would join the stone and be flyyyyyyying for a few seconds.

If you want them all to drop at once, you should deconstruct the floor tiles carefully one after each other.

[soup_alex]

Deconstructing all these floor tiles at once will lead to prematurely dropping dwarves though: they love to stand on floor tiles that are in the process of deconstruction, and so they would join the stone and be flyyyyyyying for a few seconds.

If you want them all to drop at once, you should deconstruct the floor tiles carefully one after each other.

Also, generally speaking, "dwarves do it from the west".

Lytha, your avatar has been staring me these past few days and... I... I can't look away.

[Lytha]

Also, generally speaking, "dwarves do it from the west".

Lytha, your avatar has been staring me these past few days and... I... I can't look away.

From the west or from the north, or sometimes for random reasons (like: "wow, if I do it from the south this time, I can wall myself in!") from other directions as well.


This ain't a cat skull totem that's staring at ye.