Dealing with concreted cavities

[Two Acres]

Could run an IS flag up on it then give the USAF a ring.

 

No...they'll demolish the bungalow...friendly fire

[treequip]

Use a concrete chainsaw?

 

Can't help you but...I watched one of these being used a few days back, quite impressed.

 

These are largely abrasive cutters which perform as badly on wood as regular chainsaw do on concrete.

 

Concrete in timber is a baaaaad combination, good luck with it

[Daniël Bos]

Stihl rescue chain (rdr) would cut it, but needs a hardnosed bar that should be written off unless you have a high output oiler on an ms660 or 460. It's also not easy to get and expensive!

[Shane]

Thanks for all the comments, one other thought was a demolition company, TNT in the trunk, absorbsion mats ratcheted all round then harvest the shards!

Not sure about a house being just 20ft away though.

 

Spoke with him again today and he's going to keep whatever is concreted.

 

Just gotta price the reduction!

 

Back in the comfort zone!

[base]

End of last year I dismantled a Sycomore that it transpired was filled with concrete. it turned a 2 day job into 3 and a half and we had one person sharpening chains pretty much all the time, steel wedges were our friends splitting the timber apart after you had cut as much as you thought you could get away with. Everything had to be hand balled out due to poor access personally I would stick a massive price on it or not do it, or crane the thing out. it was a royal pain in the back side

[Taupotreeman]

Of absolutely no help to the OP but; when I worked in Oz years ago we were working on a massive Eucalyptus. First branch around 30 feet up which was to be removed. The climber made the first cut only for the saw to blunt. Sent it down, had it sharpened and made the second cut a little further along the limb. Same thing happens. Repeat this scenario several times until we finally get the limb off. Turns out a local termite colony had chewed up the concrete footpath at the base of the tree and constructed their home out if it in the hollow limb we were trying to cut. It stretched for around 2 feet through the limb from just out from the collar. Even the drop from 30 feet didn't destroy the structure. Wish I'd taken a photo but that was pre digital.

[Ghettoblaster]

On ebay you can get these carbide tipped 12" (carbide grit I think) circular blades that go on a petrol disc grinder, might last a bit longer if it touches the concrete! Hope it helps!

 

KRB Karbite Ultimate Multi Purpose Carbide Blade 300mm Tree Stump Rail Sleeper | eBay

[TIMON]

Can't you chisel the concrete out with a hydropack demolition breaker ( or a pneumatic one ). ?? Can't be any heavier than an 880.

[aspenarb]

On ebay you can get these carbide tipped 12" (carbide grit I think) circular blades that go on a petrol disc grinder, might last a bit longer if it touches the concrete! Hope it helps!

 

KRB Karbite Ultimate Multi Purpose Carbide Blade 300mm Tree Stump Rail Sleeper | eBay

 

Those blades are brilliant, we used one for cutting hundreds of privet stumps off below ground on a really steep bank. You have to keep turning them round in the saw as they dull off and clogg up. If you cant crane that trunk with concrete out and get it to a burn site you will have to gun and chop it up where it is. They will probably just leave it there to rot away when they get the quote for removal. You could always fell it and just keep running up and down it with a stump grinder till the concrete shows itself then gun it up.

 

Bob

[matelot]

I'd vote for a 1.5 tonne mini digger with concrete breaker.

 

I've come across "expanding grout" at work, you drill a hole in concrete, pour this grout in and it slowly expands and breaks the concrete.