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Posted by BETA-33 on April 4, 2008, 2:45 pm
1) You can rent an electric jack hammer from any tool rental place. They
are fairly inexpensive to rent and I think should probably work.
2) You can use a 4x4, or a strong crow bar, or something similar, as a
lever to raise one end of the concrete up. Then place something solid under
the raised piece of concrete. Then hit the concrete with a sledge hammer.
When the concrete is embedded in the dirt, hitting it with a sledge hammer
probably will not break it, but when it's raised up a few inches, hitting it
will cause it to crack and break.
3) You can dig a deeper hole next to and under the remaining piece of
concrete and just bury it deeper into the ground where it is.
> Our house has a flower bed immediately in front of the foundation.
> There's a patch in the flower bed that has no significant plants growing
> in it, and we decided to add some. When we tried to dig a hole to plant
> them, we discovered why there aren't any plants there:
>
> It seems that someone had some leftover concrete, perhaps from pouring a
> stairway nearby that goes from driveway level up to front lawn level,
> and they simply dumped the excess concrete into the area that would
> eventually be the flower bed. There is a chunk of concrete about 6
> inches thick, 6 feet long, and 2.5 feet wide in there, with a few inches
> of dirt over it. The concrete is not attached to the foundation or the
> sidewalk, it's just lying there. But it's too heavy to move as a single
> piece.
>
> So I've been breaking it up into smaller pieces, using a single-point
> concrete chisel and a 3 pound club hammer. This just doesn't work very
> well for breaking 6 inch thick concrete. I end up holding the chisel in
> one hand and the hammer in the other until I get the chisel embedded far
> enough to stand up on its own, then I switch to two hands on the hammer.
> Sometimes this works in a half-dozen strikes, sometimes it never works
> and I try moving the chisel somewhere else. I've probably spent a
> couple of hours on this already, and it's down to half the original
> size, but progress is discouragingly slow.
>
> The two ways to improve the situation seem to be: get a bigger hammer
> (e.g. a long-handled sledgehammer), or some sort of power hammer. What
> would be suitable for 6 inch concrete?
>
> Dave
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