[TheForge] Is anyone on-line ? OT: Washed away?

[Jerry Frost]

Okay, in shifty sand that isn't subject to freeze thaw screw piles could 
well be the better choice. For driven, you'd want a displacement pile with 
stoppers. Old school foundation, well proven, been around at least since 
Rome. Regardless of type you must place the load bearing section of the pile 
below the extreme scower level. The source of the scower doesn't matter, 
it's water movement and water movement is water movement.

Freeze thaw is a different kettle of fish, Water freezing can and does pull 
BIG pieces off mountains, puny building foundations are no contest unless we 
design them so ice can't get a grip. And yes it is true, it's entirely too 
easy to drive too much pile for a building in freeze thaw conditions. Just 
penetrating strata that will freeze means increased skin friction and enough 
skin friction and the ice can pull the pile up. (jacking) The easy solution 
is make sure there's enough weight to keep it from jacking. Do NOT put a 
50tn. pile where you only need a 30tn. pile, if a little is good a lot is 
NOT better.

Jer
----- Original Message ----- 
From: "Andrew Vida" <osan at netlabs.net>
To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Wednesday, November 07, 2012 7:06 PM
Subject: Re: [TheForge] Is anyone on-line ? OT: Washed away?


>
>
> On 11/7/2012 4:43 PM, Jerry Frost wrote:
>> Screw pile? What's wrong with driven piles?
>
> If you want strength in the sandy conditions of coastal areas, the screw
> pile is a good way to go if the piles are to bear vertical load.  I
> suppose hydraulic cement would be at least as good... perhaps better.  I
> was only mentioning one possible method.  I am sure there are several.
> Piles would have to be hella deep in any event because the wave action
> in a hurricane will strip sand away faster than you can say "oh shit".
>
> So long as you don't get too
>> carried away with end bearing the skin friction will keep them from 
>> jacking
>> from freeze thaw. Virtually any foundation that penetrates the freeze 
>> zone
>> has to allow the soil to slip in freeze thaw or it'll be jacked out of 
>> the
>> ground. If by screw pile you're referring to some kind of auger it'd have
>> far too solid a grip in the freeze zone and you'd end up with one of 
>> those
>> carnival tilte houses.
>
> Not sure that last bit is true.  Lots of  light houses are of screw pile
> construction and not all of those have submerged foundations, though
> AFAIK most do.  I would imagine that is you pour a couple thousands of
> tons of  cement foundation upon such piles you will be good to go for a
> long-ish time.  Screw piles are brutally strong and well known for their
> stability.  There are companies that reinforce house foundations with
> them and I have heard more than one story of houses in floods where the
> entire underlying earth had been washed away yet the house remained,
> still entirely stable upon the piles alone.
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