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Ottawa LRT
Whoops!


It was lowering a small cement mixer vehicle, and overbalanced.  Comments in the video imply that the stabilizers were not deployed.  Looking at that picture, you can see that the far-side stabilizer is pretty clearly not deployed, though that one wouldn't have saved it.
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(04-26-2017, 12:16 PM)Markster Wrote: Whoops!


It was lowering a small cement mixer vehicle, and overbalanced.  Comments in the video imply that the stabilizers were not deployed.  Looking at that picture, you can see that the far-side stabilizer is pretty clearly not deployed, though that one wouldn't have saved it.

I'm only licensed to operate small cranes with a capacity of under 8T but the principals for operating remain the same no matter the size of crane.

Every crane has a load chart that will tell the operator how much they can safely lift depending on the length of the boom, the radius, etc. The operator chose to ignore something and this is what happens. The cranes I operate have a computer and sensor that tells me the weight of the load, and every big crane I've ever worked with is the exact same... it starts beeping the second it senses an overload situation and cranes will not operate unless an override button is pushed.

If I were doing this lift I'd have turned the crane 90° and ordered one with a longer boom on it. Obviously this crane just doesn't have the capacity for this lift in this configuration. Lifting over the side on crawler cranes usually results in lower capacties too. Dunno what the operator was smoking this morning but this mistake seems to be on them from what I can see. Unless it was an engineered lift then it's on the EOR for that but it's unlikely that a small cement mixer lift would be an engineered lift.
Reply
(04-26-2017, 12:16 PM)Markster Wrote: Whoops!


It was lowering a small cement mixer vehicle, and overbalanced.  Comments in the video imply that the stabilizers were not deployed.  Looking at that picture, you can see that the far-side stabilizer is pretty clearly not deployed, though that one wouldn't have saved it.

See! LRT is bad news.  Tongue
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