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Rank: Advanced Member Groups: Member
Joined: 12/25/2007 Posts: 1,358 Location: Kodiak Ak.
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Rank: Advanced Member Groups: Member
Joined: 6/18/2003 Posts: 2,141 Location: Charlotte, North Carolina
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That's horrible. It sounds as if someone was really hurt. What's the real story? CAW
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Rank: Advanced Member Groups: Member
Joined: 6/14/2016 Posts: 153
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Holy crap! I hope that one guy that was yelling lived... not good
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Rank: Advanced Member Groups: Member
Joined: 1/14/2006 Posts: 667 Location: The Netherlands
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Rank: Advanced Member Groups: Member
Joined: 2/1/2017 Posts: 176 Location: Goshen, Indiana
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I fully realize it's easy to "armchair quarterback" these situations but wouldn't it make sense to release the load when this is beginning to happen? Does the operator not have the sensation of tipping? Are there warnings? Even a destroyed load has to be cheaper than this outcome.
Not an operator, only an interested bystander,
Rob
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Rank: Newbie Groups: Member
Joined: 12/22/2014 Posts: 7
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Yes absolutely you feel it. Looks like there was a gap in the steel plate and the front roller dropped slightly as he was walking backward. Just enough to tip the whole unit enough to have the floating tray drift in and the load drift out of his radius. I could be wrong just something I noticed.
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Rank: Advanced Member Groups: Member
Joined: 3/16/2015 Posts: 154
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RobS wrote:I fully realize it's easy to "armchair quarterback" these situations but wouldn't it make sense to release the load when this is beginning to happen? Does the operator not have the sensation of tipping? Are there warnings? Even a destroyed load has to be cheaper than this outcome.
Not an operator, only an interested bystander,
Rob Rob, I have wondered that myself for many years. Crane after crane collapse and they still go down with the load. There must be an explosive cable cutting mechanism where the cable is cut as soon as the crane is going out of limits. It is absolutely retarded to operate those heavy machines w/o it.
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Rank: Advanced Member Groups: Member
Joined: 7/14/2008 Posts: 247 Location: Germany, CE
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Hi Maxcavator,
on many Pipelayers you will find a emergancy release function to drop the load suddenly if needed. I'm not a crane guy, but what's about a back fire when you cut a cable and drop the load immediatly on a crane this large?
Prost,
Max
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Rank: Advanced Member Groups: Member
Joined: 2/22/2008 Posts: 213 Location: Columbia, MD
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That was one horrible accident. It was fortunate (and perhaps a miracle) that no one was injured badly or worse in this mishap. No doubt, an investigation into why this happened will take place. Not knowing the lifting plan, positioning of the crane, radius of said load (which looks like a box girder being lifted for placement atop the pier seen to the right), possible wind conditions and the levelness and stability of the ground, it is hard to say exactly what caused this. I won't even begin to speculate what the chain of events were leading up to the collapse. I was wondering why the crane was being walked backwards, to the point that the rear of the crawlers were beyond the timber mats.
As far as being able to drop such a load to avoid an accident in this case, I believe that it might have been impossible to do once the tipping began, first because, the operator probably didn't feel the machine as first began tipping forward. It appears from the video, that the tip began rather slowly; the very first sensation of movement might not have been sensed until it was too late. And, if I am not mistaken (correct me if wrong) this crane might not have free-fall on the main hoist drums, and given the many parts of line in the block, the load could not be lowered fast enough to unload the crane before it tipped.
In any case, a tragic case, and a reminder of the dangers involved in heavy picks.
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Rank: Advanced Member Groups: Member
Joined: 11/18/2008 Posts: 630
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Once that rig began to go, the operator was just along for the ride. On a hydro, there is no "letting the load go." And with that many parts of line, even at full throttle, max line down, the block will barely move.
thou shall not over-moderate!!!
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Rank: Advanced Member Groups: Member
Joined: 6/4/2006 Posts: 7,744 Location: arlington, Tx
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Somtimes like in this case a floating tray, say you cut the load then you would have the high boom angle and the height of the tray pulling backeards on the machine. So it probably would have dropped the load and then went over backwards. What a lot of people who are not around cranes if you have a lot of parts on the block it does not move fast at all you can cable down but you probably dont have time to get the load down. Jason
Nikl Scale Models nikl scale models shapeways store
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