Crane Vs. Floor
Crane Vs. Floor
(OP)
This is a couple of months old, but I hadn't seen it before:
http://www.vertikal.net/en/stories.php?id=6733
http://www.vertikal.net/en/stories.php?id=6733
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Crane Vs. Floor
RE: Crane Vs. Floor
What is even more baffling to me is that the shore does not seem to have buckled. I don't know if it was a case of the shore not being under the outrigger.
The slab looks paper thin to carry anything so monstrous. Does anyone know what really happened?
RE: Crane Vs. Floor
No bar joists.
No rebar, except that used to hold up plastic flags.
Am I being dumber than usual today?
Mike Halloran
Pembroke Pines, FL, USA
RE: Crane Vs. Floor
"Incident: Friday Morning 26/09/08 - Castle Hill/Sydney
- 9 Day Old 250t Leibherr Crane (never used before)
- $4mill price tag
- Failure of back propping beneath the 200mm thick concrete deck
- Crane support outrigger punches through slab causing crane to lose balance and collapse across the site and onto adjoining property
- Crane balanced in the air for approx 1 hour before entire rig & boom collapse completely across site and rigs falls through to the basement level."
Perhaps 'Failure of back propping' means the outrigger loads weren't located over the props, or the props fell over due to slab movement.
RE: Crane Vs. Floor
The slab was a PT slab, it failed in punching shear.I remember when that happened, we were actualy checking another slab for that same purpose! I'll tell you what we doubled checked our calc then added some just to be sure!
btw our slab was fine after the loading!
RE: Crane Vs. Floor
Then I scrolled down. It appears that the crane fell into the basement area. You can see a basement retaining wall in the background. It seems possible that the operator thought he was on the retained soil side of the basement wall but drove the crane past that into the elevated slab area.
RE: Crane Vs. Floor
RE: Crane Vs. Floor
Also, it could very well be that the outriggers were not located directly over the shoring towers, which caused the outriggers to punch through the slab.
RE: Crane Vs. Floor