Perfect controlled demolition of twin chimneys - video

**owen moore** · Dec 11, 2018, 11:44 PM

That guy's cornbread ain't done in the middle!

**basil3w** · Dec 12, 2018, 08:25 AM

He must think he's going to survive, after all, he's wearing a dust mask!

**Jon** · Dec 12, 2018, 09:09 AM

Admittedly, that demolition-from-inside is probably at or near maximum craziness. I don't think we'll be able to beat it. However, maybe we can top it:

**PJs** · Dec 12, 2018, 09:12 AM

Yep, that tops it!

**PJs** · Dec 12, 2018, 10:36 AM

Nice design, Very cool Frank. Curious how you fed and released the cylinder...must have been a double acting cylinder and switch/valving? And keeping the lines (400ft) & fittings from harm must have been a bit of a challenge.

**Frank S** · Dec 12, 2018, 12:40 PM

Pjs When I made the cylinder I used a 4" rod the piston was 8" the wall thickness on the cylinder was 3/4" and yes double acting the main problem in making the cylinder was I had to make such a short head or gland and a thin steel piston of only 1.5" the head was only 2 inches thick and made of steel as well os I had to use a bronze bearing in it the power unit was basically like you would find on a larger log splitter or pony unit on a hydraulic operated trailer. so it had a 4 way valve you just moved the leaver left right or center. the hosed were only about 25 feet so we just lowered everything from floor to floor as we went down. Simple fast and very efficient Hung from a chain hoist on a tripod. I imagine the company called Concrete cutters probably still has it leaning against a wall in their shop I can't imagine them ever getting rid of it.

**basil3w** · Dec 12, 2018, 05:44 PM

Certainly does top it! Just think about how efficient the crane/excavator combination actually is: After weakening a section of stack, the crane operator could signal the guy in the excavator to buckle his seat belt and then use the excavator as a wrecking ball!