i'm designing (for a uni project) an underground bld next to a lake, the bottom of the building being in line with the watertable.
the building is a rc shell, so how do i tank this thing?
usual cavity between wall and ground, filled with gravel? can i just use a waterproof membrane and avoid the cavity? extraction?
consider that the water in the ground is going to be frozen for 8 months a year...(it's in northern sweden)
none of the books i have at home talk of this type of foundation in these climates, and there is no access to the library untill monday...day on which i have a meeting with a structural engineer and would like to have something to start the converstion with...anyone with knowledge of building in these conditions?
waterproof construction - bentonite panels on mud slab with drainage tile at floor line- floor to wall joints and other construction joints to have water bars this slab would be generally a continuos thickness
or
underslab drainage system and continuously pump; slab over gravel without a big hydrostatic contribution.
since your underground, even there i am not certain why your thinking cavity wall. the ground is insulation enough.
not knowing the section completely from your discription, you might have to have sheet piling as water cut-off system to build it. then build the rc up to the face of the sheet piling.
if permafrost is a problem, you most likely will be into some piling foundation, not a thick matt or footing. or perhaps a real thick matt to hold it down by mass.
slab over gravel was the initial idea, the insulation has to be there because of very low ground temps around 0 as an average, suggested by the environ. eng)
no cavity wall, insulation to the outside of concrete wall, and then waterproofing onto insulation (looking into a few materials that are both insulation and waterproofing)
ground excavated, foundations poured, the rest of the structure being precast concrete ring sections (kinda like a "pipe" construction) put in place to cut construction times, i have a 5 months window for construction before it all goes under 1 meter of snow for 8 months.
the sheet piling is a good idea, but it would make the whole process very long.longer precast slabs maybe...dig trench, slip slabs into trench, excavate...it would save having to wait for the piles to cure.
permafrost=expansion? i hadn't though about that...it's kinda logical!
I would say that expansion/contraction would surely be an issue - with such a variance in temperatures - although I would also assume that the temperature varies much less under ground than it does above it.
How far is it underground? I somehow imagine traditional techniques might not be appropriate in this case - surely gravel/insulation/membrane would practically get crushed at a very deep level?
naked women! here!
you wish...i just got your attention at least
i'm designing (for a uni project) an underground bld next to a lake, the bottom of the building being in line with the watertable.
the building is a rc shell, so how do i tank this thing?
usual cavity between wall and ground, filled with gravel? can i just use a waterproof membrane and avoid the cavity? extraction?
consider that the water in the ground is going to be frozen for 8 months a year...(it's in northern sweden)
none of the books i have at home talk of this type of foundation in these climates, and there is no access to the library untill monday...day on which i have a meeting with a structural engineer and would like to have something to start the converstion with...anyone with knowledge of building in these conditions?
a couple of thoughts;
waterproof construction - bentonite panels on mud slab with drainage tile at floor line- floor to wall joints and other construction joints to have water bars this slab would be generally a continuos thickness
or
underslab drainage system and continuously pump; slab over gravel without a big hydrostatic contribution.
since your underground, even there i am not certain why your thinking cavity wall. the ground is insulation enough.
not knowing the section completely from your discription, you might have to have sheet piling as water cut-off system to build it. then build the rc up to the face of the sheet piling.
if permafrost is a problem, you most likely will be into some piling foundation, not a thick matt or footing. or perhaps a real thick matt to hold it down by mass.
T
i want the naked women
slab over gravel was the initial idea, the insulation has to be there because of very low ground temps around 0 as an average, suggested by the environ. eng)
no cavity wall, insulation to the outside of concrete wall, and then waterproofing onto insulation (looking into a few materials that are both insulation and waterproofing)
ground excavated, foundations poured, the rest of the structure being precast concrete ring sections (kinda like a "pipe" construction) put in place to cut construction times, i have a 5 months window for construction before it all goes under 1 meter of snow for 8 months.
the sheet piling is a good idea, but it would make the whole process very long.longer precast slabs maybe...dig trench, slip slabs into trench, excavate...it would save having to wait for the piles to cure.
permafrost=expansion? i hadn't though about that...it's kinda logical!
thanks ted.
sorry about there being no naked girls
anti,here
(the link contains adult material!)
nasty indeed ... and forunately not naked : )
bigness ... you damn tease !
nude not naked
vado, less art, more construction technology!:)
hell na bigness!
more art, less CT!!
... a great photo if her left arm wasn't hidden by shadow... still great pose : )... much better than the F A T lady ~ thanks!
they're not fat. they're reuben-esque
I think I should contribute ...
Here's Britney .......
this should be another image thread ... ok guys .. lets contibute for bigness sake ...
but make it art .. not porn !!
sporadic,
I was terrified there for a moment.
am I GLAD to see you didnt post anything to do with zaha here.
you asked for this bigness...
I would say that expansion/contraction would surely be an issue - with such a variance in temperatures - although I would also assume that the temperature varies much less under ground than it does above it.
How far is it underground? I somehow imagine traditional techniques might not be appropriate in this case - surely gravel/insulation/membrane would practically get crushed at a very deep level?
hmmmm bunker technology anyone?
it's about 5 meters from the original GL, backfilled to be about 8 meters underground.
i'm not sure at which depth the ground temperature becomes different from the atmosferic one...but i would immagine it's much deeper than 5 meter.
tutor suggested the gravel/insulation solution, he's swedish (you'd think he would know his permafrost foundation!). we'll see what the SE says.
do i need to pump water from the gravel? wouldn't it be pumping continously being so close to the lake?
you are a bunch of easily distracted kids!:)
sorry bigness, didn't mean to divert your CT needs
anti, no worries
just felt like sharing this special video...i dare you to watch the entire thing
geeeeeenius!
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