What do you mean "sliding down"? Do you mean sliding up the truss when you come up on the crane? A girth choke, sometimes with an extra wrap should stay in place, even lifting a column.
http://en.wikipedia.org/wiki/Timber_hitchGood call. Also just realized that if I'm setting rafters, i can just screw a block to the top since it will be covered anyway. Duhh
http://www.contractortalk.com/f40/school-me-telehandlers-146915/#post1988052Really!? "This sounds dangerous if you have to ask these questions" seriously? ............ Look at my history, i'm plenty qualified.
Not a problem, I'm certified as well. Maybe you do have the experience but I wasn't sure when I got the impression you were thinking of lifting them with a rope. Don't use a rope! use straps.
If it was me building this I probably wouldn't set them with a boom truck or forklift. I would set up some planks and muscle them up. Because you're talking rafters not trusses right? Seems like a lot of fooling around rigging up one at a time and trying to control it with a boom truck. If you really want to set them with equipment then I would use a spreader bar. And call the manufacturer of the bar to ask them if there's a safe way to hoist your rafters at an angle. But my guess is they'll tell you not to do it. If you've ever lost a beam being lifted or seen it happen, it doesn't take much tilt before the thing goes flying out.
I don't, and I'm presently the rigging superintendent for a crane companyI see what you mean with your idea but in my opinion spreaders are safer, less movement.
Well, he must not be too smartI disagree with you, but you can think that. Btw, the guy that actually wrote them the fine is the one that explained the Kingdome incident to me.