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Posted by Bobk207 on August 8, 2006, 11:26 am
Manjo wrote:
> Robert,
>
> Thanks for the idea. Where would I get plastic shims? Are they
> something a hardware store would normally carry?
>
> Thanks,
>
> Manjo
>
>
> Robert Allison wrote:
> > Manjo wrote:
> > > There's a 4' x 3' x 1.5' poured concrete block at the bottom of the
> > > back steps that's shifted down and to the left about 2 inches.
> > >
> > > I've dug a 12" wide and 12" deep "tunnel" under the block's low end
> > > and can get a small 2-ton bottle jack under the block. With 2x6's
> > > above and below the jack, I can raise the block the required 2 inches
> > > to level it.
> > >
> > > Now I need some ideas/guidance on how to permanently support and hold
> > > the raised block in place. I would like to pour cement under the
> > > block, but I don't know how to temporarily hold the block in place as I
> > > removed the jack so I can pour the cement under the block.
> > >
> > > TIA for any tips, suggestions, ideas.
> > >
> > > Manjo
> > >
> > Use bricks and plastic shims. You will have to install the
> > bricks and shims, set the weight down on them and see if it
> > sinks (it will probably sink a little). Jack it back up and
> > add more shims or bricks. Repeat as necessary until steps are
> > where you want them, then pour the concrete. Be careful not
> > to bump the brick column when working the concrete.
> >
> > --
> > Robert Allison
> > Rimshot, Inc.
> > Georgetown, TX
Manjo-
I assume this block is a landing at the base of some steps?
If you're going to have to place some more concrete to stabilize the
block...perhaps an easier approach is to remove & replace the block.
It's pretty thick.....frost zone? Because structurally there's no need
for something that thick.
Your block is about 2700 pounds so be careful when working around it
while raised.
Is the soil under it sound? No organics?
I would also suggest just adding leveled smoothed sand under the block.
The block is so heavy you'll need to get good uniform bearing against
the soil so that it doesn't sink more. Local shims & blocks, unless
over a large area will also sink over time, hence the need for more
concrete.
Why did the block sink? With uniform bearing that's less than 250
pounds per square foot...way less than even crappy soil can handle.
cheers
Bob
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