Breaking out Existing Foundation

[hamazz]

need advice on breaking out an existing conservatory foundation, that is 500 wide * 450mm deep, need to replace it with a 600wide * 1200 deep.
someone mentioned underpinning it, but will take alot of time and increase cost as would have to be done in sections etc.
so want to look at breaking it out, not sure the small hydraulic breakers like the jcb/beaver would be able to break it as its 450mm deep.
probably thinking of getting a small excavator with a breaker on it.
have about 15+ lm


any comments welcome.

hamazz

 

[hamazz]

another thing is has anyone used or can advise on chemical concrete breaking?

hamazz

 

[noseall]

If you can access a mini digger then hoof it out with that.

Takes a bit of skill though and you will still need to break the foundation so that the digger can pull it out.

 

[dann09]

Is the "foundation"in question, a solid concrete poured foundation and footing? Or is it a poured footing and a built-up on block or brick foundation? If it's built-up it will come out easily.

Forget about underpinning or anything else - do as noseal suggested.
You could even jack hammer it up with a hired jack, or use a large SDS roto-hammer drill to painfully crack it out.

note: some tippers will cart clean concrete or brick debris for free.

 

[hamazz]

spoke to a plant hire company, and they recommended a 3t digger with a 3t breaker on it, said it should not take too much time.
ill try and get it out clean, but with the weather these days and mud everywhere not sure how easy it would be.
its a solid concrete pour strip, no built up blockwork

someone else recommended to use a road saw or petrol saw and cut a few lines through it, and it will come out easier.


thanks for the advice everyone.

hamazz

 

[hamazz]

just found a product on the net called dexpan, which is a no-explosive demolition mortar, you drill holes into the slab and then fill it with a mortar that expands and creates cracks in the concrete. its a product from the USA but found uk distributors for it, anyone tried anything like this?

hamazz

 

[Norcon]

An excavator with a rock hammer is the best option.
From your dimensions you have about 3.5 cubic meters to break.
Almost 10 ton.

I'd be happier with a 5 ton machine.

That deadpan stuff is a gimmick. The amount of drilling is collossal.