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[janamdo]

I made a staircase, but it is 2 z levels heigth in the cavern and mined deep
The dwarfs mined this out as there were 2 existing z layers

Seems to that when they made a down stair at a bottom layer and brake thru the floor ..they saw a dark cavern below
It probably simplified this game enviroment ?   

It's a open connection now from the cavern to the fortress: what creep comes up .. 

 

[janamdo]

Can i close off the cavern from the fortress?

[Dracko81]

Can i close off the cavern from the fortress?

Depends how you breached.

If the staircase is directly over the caverns you can remove the up/down stairs with "d" > "z" and then build up stairs "b" > "C" > "u".  If you do this make sure to leave at least one up up/down staircase when removing so your dwarves can get down to build the the up stairs.  When you have one up stairs you can remove the other up/down stairs.  Up stairs will block movement from below.  Up/down stairs will not.

If you breach by digging, build walls "b" > "C" > "w".  Fairly straight forward.

If you breached with up/down stairs and they are exposed to the side you can just build walls next to the stairs.

[PatrikLundell]

You can actually build an Up star directly over an Up/Down stair to block access from below. For some reason you can't do that on the tile that breaches the cavern, but you can do it one step up. This can be done even if the staircase is a single tile one, i.e. the dorf can bring the material down using the Up/Down staircase and build the Up staircase while standing in the same tile (and then use the Up staircase to get back up).

[janamdo]

Thanks,
in this case the 2 level stairs were digged thrue small parts of a present wall in the Cavern.
I made wooden walls for blocking the remaining open area of the stairs connected with the existing rock walls in the cavern.

Its now sealed off the cavern fromthe fortress  ..when i remove a wall and place a door  ..i could go into the caverns if i dare.

[PatrikLundell]

Thanks,
in this case the 2 level stairs were digged thrue small parts of a present wall in the Cavern.
I made wooden walls for blocking the remaining open area of the stairs connected with the existing rock walls in the cavern.

Its now sealed off the cavern fromthe fortress  ..when i remove a wall and place a door  ..i could go into the caverns if i dare.

A door is not recommended. Trolls are building destroyers and thus can smash doors. FBs are as well. A safe access to a cavern requires a raising drawbridge (I always build an airlock, i.e. two drawbridges with a corridor in between. When I breach a cavern I plug the breach as quickly as possible. Then I dig space for an airlock, without removing the last tile to the cavern. Once everything is built and tested [easy to accidentally hook both levers to the same drawbridge, or make a retracting drawbridge rather than a raining one], I send a dorf to mine away the last tile. These are the basics. Apart from that I also have cage traps and a bait door in there).

[janamdo]

Thanks
For now i build a wall to replace the door to the Caverns, because the fortress has a basic defense and not yet militairy forces
 

 

[Iduno]

That's part of why I stopped digging a single shaft for stairs. Every 5-ish levels, I make a hallway a few squares long, then create another set of stairs 5 levels deep. I've had no problems with giant cave spiders eating my population since. It makes it a lot easier to just wall off 5 levels of stairs at most and re-dig them somewhere safe. Something like this:

Spoiler (click to show/hide)

X
X
X
X
<___>
       X
       X
       X
       X
>__<

If you want to be lazy about it, you can dig down until you hit the upper caverns (which are much less dangerous) then start with the safety stairs.

[janamdo]

Thanks
Remarkable that chancing the stairshaft direction prevents the spiders to sneak in the fortress
Seems to me a programming failure or not?
Safety stairs ? ..you mean that vertical combined  horizontal shafting ?

[PatrikLundell]

Why would adding a floor below a staircase to block the hole below be a programming failure?

An Up/Down staircase is a stair upwards and a hole in the floor downwards (with the potential stair on the tile below joining up with the current one through the hole). A Down staircase is just a hole in the floor, while an Up staircase is a floor and a stair upwards.

[janamdo]

Why would adding a floor below a staircase to block the hole below be a programming failure?

An Up/Down staircase is a stair upwards and a hole in the floor downwards (with the potential stair on the tile below joining up with the current one through the hole). A Down staircase is just a hole in the floor, while an Up staircase is a floor and a stair upwards.

Sorry, i forget to mention on what person i react on, it was not on your post, but on the construction of a  staircase shaft from @Iduno
http://www.bay12forums.com/smf/index.php?action=post;quote=8107284;topic=175909.0;last_msg=8107474Or do i miss something  ..could be that there is confusion about a safety stair ? ( i don't know what that is in DF)

The programming failure (possible? )is  that a spider from a cavern below don't come into the fortress , caused by the stairway construction.
 
It's all a little bit complicated what safety stair constructions can be made when entering a cavern?

[PatrikLundell]

DF itself hasn't got anything called a "safety stair". I would guess Iduno just digs a staircase until it hits the cavern and then blocks off the corridor leading to the staircase with a wall. I block off the staircase as far down as possible with a built Up stair and then digs the horizontal tunnel to continue the downward exploration from there.

[Dracko81]

DF itself hasn't got anything called a "safety stair". I would guess Iduno just digs a staircase until it hits the cavern and then blocks off the corridor leading to the staircase with a wall. I block off the staircase as far down as possible with a built Up stair and then digs the horizontal tunnel to continue the downward exploration from there.

This is exactly what I do too, unless I can just wall off the affected area as a glancing blow on the caverns.

I wouldn't use the corridor > Stairs > Corridor > stairs every few levels either.  This is due to the fact that it means more walking for dwarfs, less walking is always better.  I don't get things in my fortress from the caverns unless I open my draw bridges.