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Crane Collapse and Tip Over- What Would You Do?
Here's an intersting and challenging scenario that occurred recently (But with no one trapped), that was emailed to me. The pictures show before collapse, just after collapse and then finally after the whole lot tipped over...
Some background information:
- 9 Day Old 250 tonne 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.
You're first on scene, with the driver still in the crane control cabin. The clock is ticking- you've got 1 hour before the collapse described above. What would you do?
Replies to This Discussion
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Permalink Reply by lutan1 on
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TC, I asked this earlier, "I'm probably going to regret asking this because you're going to blow me away with physics and maths, but how does a crane weighing 97 tonne lift 250 tonne without tipping over all the time?"
Give me a lesson in pyhscis and fulcrums and the like! -
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Permalink Reply by Asst Chief Tim Cook on
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Can't give you the mathmatical BS.I used to run a baby crane at my old job,probably a 50-60 ton crawler NO OUTRIGGERS! When you wanted to lift anything that weighed much you had to have the boom pretty much straight up and in direct line with the tracks.Think of the machine as a triangle,with the outriggers PROPERLY set,and a pretty steep up angle on the boom along with that 75-100 ton counterweight you have a pretty stable platform.The heavier the load,the more erect the boom has to be.If you get bored,get a short fishing pole and hook a fish weight scale to the rod,similar to the old support cables on an old cable machine.Then find an established weight for the end and try reeling in that weight at different angles while watching the fish scale.It's pretty surprising how much capacity you gain by about 15% of elevation.Did I lose you yet?
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Permalink Reply by Engineco913 on
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If the site has multiple cranes, I would set another up OUTSIDE the confines of the building and use the manlift basket to make the grab. IF this is not possible, your in a world of crap. Balancing the load with a ladder is a good idea accept you have all that weight of the crane that could potentially collapse an unknown amount of concrete more at any moment. Where's the Coast Guard with the rescue swimmer basket? lol
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We're in agreement on the world of Doo.I wasn't planning on hanging around the ladder filming the event;more of a swoop,scoop and screw.What, you don't want to secure this with ropes?Hehe T.c.
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