[Actually, I don't see much bend in this one.]
Larry Winchester Jibs are for height, not radius.
Keith Havard Hope the pic of boom flexed is with load on hook.
Mike Newcomb lot of cable. [I wonder how much weight the cable itself adds to the load at the end of the boom.]
Mark Walker I'm thinking he maybe close to the end of the chart in that second pic looking from the rear
But the operator needs to know the chart and avoid bending too much. It looks like they should have lifted the tower crane boom as two pieces. Note that as soon as the boom broke, the base lost its load, and it straightened right up.
|Terex Cranes posted|
Here's a great example of collaboration - Cropac Equipment Inc., C&C Crane, Total Crane Rental, and MTN Forming brought their expertise together on this Ontario waterfront project with Terex SK 315 and SK 415 tower cranes http://info.terex.com/OntarioTowers
[It looks like there is a bend in that boom to me. It also looks like the inner segments are only partially extended. I assume they are overlapping more steel at the base of the boom to try to reduce the bend.]
|Balaji Mani posted|
[Each segment is extended the same amount, but only about 2/3 of its length. I think there is a little bend in the boom.]
|Frank Pintaro posted|
Just a little boom deflection Gmk 5275
|J.P. Duffy posted|
Might be short rigging a couple pics tomorrow
[Building a Potain tower crane: "It will be a MDT219 10t 65m jib." There is a long discussion about "line pull." I don't know what they are talking about, and evidently the operator also does not understand either.]
|Bay Crane posted|
[It looks like there is a little bend in this one.]
|Patrick M Harrison posted|
|Brandon Leichinger commented on the above posting|
|John M. Childers commented on the above posting|
I can relate!!!!
|Devin Parsons posted|
Fish on!!! 🎣🎣🎣🎣
|Brandon L Grace commented on the above posting|
|Thomas Dearmond on the above posting|
|Brandon Owens commented on the above posting|
Philippe Dumas posted three photos with the comment: "GMK 5250L"
|Phillippe Dumas posted|
Jim Paris I'm guessing that the charts say it's a good lift, but man that is an ugly looking boom angle!Philippe Dumas 70 + 21m jib at long radius = it seems normalPete Lefebvre With that jib probably lifting roofers styrofoam
Luke Brower posted two photos with the comment: "From JJ Curran's page."
Luke Brower Need to reach from Detroit to Ohio looks like the crane for the job. 336' and no luffer.
Bill McCarthy If it didn't deflect , then I would start to worry .....
Craig Harry Cameron Derek Manns seen one of these before ?Derek Manns No never broken like that.Garrett Larkin Brian Boudreau I'm not even sure how.Brian Boudreau KATO's new series of knuckle picker.
[It looks like Kato needs to go back to the drawing board (actually, the computer screen) and add some steel to the main boom. The problem with computer aided design is that it allows the engineers to build with less steel than they did in the pencil and paper days. That improves the cost of building, but lowers the margin of safety.]
Jeff Funk Looks like rotec failure ouch
[This is the first time I have seen a photo of the attachment of the house to the truck failing. Normally the truck tips over if the load is off the chart.]
Jim Browne The extra pendants are well ahead of the mid-point to create counter-moment in the boom that resists the bending moment along its whole length. At high boom angles they apply very little moment as the boom is no longer bending as much. Its pretty clever.
The first 30 seconds of this video is interesting. It shows that the boom needs to be raised as it bends underload. It is selling a computer to do the compensation. All of the comments felt strongly that another computer is not needed because any decent crane operator can "hold radius." (source)