1972, IIRC, we had an upright silo which had seen many years of use, but times change, and we had put in a large bunker silo to store our silage to feed cattle from over the winter.
our silo was constructed of concrete staves, with ribs on the outside, with a 'smooth' plastered interior, and filled every summer (with SILAGE, LOFTY) :-) Reinforcement were metal rods (circular) banded on the outside about every 2', top to bottom, with spacing less (between bands) near the bottom.
I and a friend, (Gary) used wrenches to undo the metal bands, starting at the top. (makes sense, doesnit Muz !) They fell to the ground, as Gary and I loosened them as we descended to structure, but we left one about 2/3 of the way up, immediately above which we looped a heavy steel cable, which was tied off to the drawbar of a John Deere, parked about 100' away it the direction of intended collapse.
Story starts to get kinda interesting at this point. (i.e. prayers headed skywards :-)
Gary and I used sledge hammers on the bottom ring of staves, knocking out every 3rd one, right around the base, and all was 'good'. (staves were concrete, appox 1' x 30" tall) As the plan was to drop it to the west, Gary then stepped about 100' to the south, and STARED at the top of the silo, and my Dad was in the Johnny, keeping tension (by clutching) on the steel cable.
I then proceeded to use my sledge to break every other stave left on the west side, bottom row. No Go -
I encouraged Gary to ANNOUNCE LOUDLY ANY MOVEMENT HE SHOULD NOTICE IN THE TOP OF OUR 'VICTIM' !!!! and proceeded to knock out every other stave still in place on the west side, bottom.
I'M DAMN SURE MY MOM WASN'T HOME :-)
Finally, the 'ole gal collapsed, and I was located 18 miles away, in a Wal Mart, buying a 6 pack of new underwears !!!!!!!!!!!!!!!!!!!!!!!!
We then picked up every chunk of concretes, and carried it to the site adjacent to the 'ex-silo' were we laid the pieces on the ground, and did some forming, and covered with new stuff from town. (cement) The steel rings were bent (kinda) straight, and used as re-bar in the outer stem wall of the shop I use today. (Butler brand, slant wall)
True Story, Arnie !
fj
