I’m currently building an addition that features a full basement. When we cut out the opening into the existing basement foundation, we were going to leave and bury the cut concrete “door” in the gravel under the new basement slab.(Basically where it falls after being cored out.) Will that cause problems with settling or contribute to any cracking in the new basement slab in the addition since the slab will be solid and the rest of the floor will feature gravel with a vapor barrier under the rest of the floor.
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If you're worried, you can still leave it where it lays but break it up.
You'll sweat a little but you wont have to carry it up stairs.
Family.....They're always there when they need you.
I doubt it would be a problem. No different than having a big rock under your slab.
Justin Fink - FHB Editorial
You will never get compaction of the gravel in the area the door covers.
I always remove all concrete debris from under a slab.
Have the excavator cut out a small grave for your concrete debris. When It drops in, plan it to be level with the remainder of the rough grade. Then, it will get the same gravel treatment.
If you are still worried, add rod over the grave.
You are going to cut the basement slab anyways so the cracks will be controlled right?
How big of a core drop are we talking? Is is 4' wide? 40' wide?
Bob's next test date: 12/10/07
Quote of the day: "...can't be done, it will take too long, not enough pipeline capacity, yada yada but yet they don't apply the same skepticism to their own "solutions" such as wind and biofuels"
I am actually getting ready to do something simular in my basement. I thought I could just have the wall sawn (can they cut all the way through from the top to the bottom?), and then push it into a grave. It should pivot off of the footing and break any rebar that might pin it. We will then have to cut new pockets in the remaining walls so that we can get a beam in there to support the floor above. To save heard room (only 8 foot basement) I thought we could maybe put the new beam on top of the wall and use joist hangers for the floor joists.
Then just pour a the new slab to be at the same elevation as the old.
Does this sound right? At first this scared the #### out of me, but now it doens't seem too teribile.
The cutout will be about 10-12 foot long so that would be a lot of concrete to break up and haul out.