Dwarf Fortress Bug Tracker - Dwarf Fortress
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0000511Dwarf FortressDwarf Mode -- Jobs, Constructions (walls etc)public2010-04-05 13:142015-03-29 12:39
Newguy12354 
lethosor 
lowminoralways
confirmedopen 
0.31.01 
 
0000511: Constructions can be built next to bridges and grates but immediately collapse if unsupported
I decided to build a wall surrounding a bridge I had built over empty spaces(the edge of the bridge touching land, but not the whole bridge.) The game allowed me to build the walls, but as soon as one tile of wall was built, it would fall down the z-level under as the bridge doesn't provide support and isn't considered like floor/stair/etc. You shouldn't be allowed to build next to a bridge that is over empty spaces or the game shouldn't consider bridge like ethereal floors/stairs/etc.
Have a space with a z level and a z+1 level. Build a bridge with one edge touching the edge of the z+1 level and the rest of the bridge hanging in the air.

Build a wall(Or any other construction) on level z+1 next to the bridge as you are allowed to and watch it fall on the z level under it(until something stops it) as soon as it is built.
It didn't kill my dwarf that was building it, but it catapulted a few tiles away as if he had been pulled down by the falling wall then has been pushed away by the cave-in in which the whole mess resulted.
construction
parent of 0004147acknowledged lethosor Building floors/walls next to grates may cause cave-ins when constructed in a certain order 
has duplicate 0000655closed Footkerchief Building a wall or floor (maybe others) on the side of a bridge with no support always causes a cave in. 
has duplicate 0001863closed Footkerchief Floor attached to bridge caves in and injures dwarves on the same z level 
Not all the children of this issue are yet resolved or closed.
Issue History
2010-04-05 13:14Newguy12354New Issue
2010-04-05 13:15Newguy12354Note Added: 0001182
2010-04-05 13:26OokpikTag Attached: construction
2010-04-05 13:39FootkerchiefCategoryDwarf Mode -- Buildings, General => Dwarf Mode -- Jobs, Constructions (walls etc)
2010-04-05 13:39FootkerchiefSummaryBuilding next to suspended bridge. => Constructions built next to bridge immediately collapse
2010-04-06 13:55FootkerchiefRelationship addedhas duplicate 0000655
2010-04-06 13:55FootkerchiefIssue Monitored: Greyhawk
2010-04-06 15:22NighteyesNote Added: 0001603
2010-05-13 15:15FootkerchiefRelationship addedhas duplicate 0001863
2010-07-20 09:00FootkerchiefNote Added: 0010720
2011-03-06 13:29FootkerchiefRelationship addedparent of 0004147
2014-12-25 12:40ptb_ptbNote Added: 0031470
2014-12-25 12:40ptb_ptbNote Edited: 0031470bug_revision_view_page.php?bugnote_id=0031470#r12584
2014-12-25 18:21lethosorSummaryConstructions built next to bridge immediately collapse => Constructions can be built next to bridges but immediately collapse
2014-12-25 18:21lethosorAssigned To => lethosor
2014-12-25 18:21lethosorStatusnew => confirmed
2015-03-29 12:39lethosorSummaryConstructions can be built next to bridges but immediately collapse => Constructions can be built next to bridges and grates but immediately collapse if unsupported

Notes
(0001182)
Newguy12354   
2010-04-05 13:15   
Sorry for the double post. I meant SUSPENDED bridge as bridge being built over empty spaces, not suspended as stopped construction.
(0001603)
Nighteyes   
2010-04-06 15:22   
This happed in the old version as well, bit of a bugger that it made it across makes building bridge defenses that much more time consuming
(0010720)
Footkerchief   
2010-07-20 09:00   
# 000436 □ [dwarf mode][constructions] bridges/grates allow you to build adjacent constructions in the air but don't support them
(0031470)
ptb_ptb   
2014-12-25 12:40   
Hey-o. Still here in DF 0.40.23. :)

I think you could consider the actual bug that dwarves _think_ that walls/floors are supported by bridges when they aren't.