I have a home that was once a ranch on a slab. A second floor was
then added and when that was done, a utility pit was placed under the
portion of the home that extended beyond the original footprint. I
now need to expand the area of this pit. I want to jackhammer through
the slab and dig out a 6-6 area. Could someone tell me the best
method to go about this without displacing so mush soild under the
rest of the slab that I have problems with settling (I am particularly
concerned about the area of the slab that supports the chimney).
Any help is appreciated. If you need more details, let me know.
Basically it boils down to how can I dig and brace the soild so I do
not upset the area I am not planning to remove.
a good place to go would be a building engineer... one who went to
school for this and has a college degree in engineering and insurance to
cover any mistakes he makes with giving advice(for which he charges
for).. or you can get free advice here and it will be worth every penny
you pay for it.... just keep your fingers crossed so if the house falls
down that you will be at work and will not get hurt... hope this helps.
Cut the floor with a masonry saw, don't jackhammer it.
Then drive sheet piling down around the hole you want to dig
at least a foot or so farther than the bottom of the pit.
(how deep a hole are you talking about, by the way?
Brace the piling in place, THEN excavate.
Depending on what kind of dirt you're on,
and how deep you're going, you might be
able to use 2x8s for the piles.
Stay the hell away from the chimney.
Re-design the plumbing runs if you have to.
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