Posted: 3/30/2009 12:02:22 PM EDT
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Top of the jib is disconnected due to the amount of weight that is being carried and the stress that is exerted. By allowing the top to be disconnected you allow the cables (which have some elasticity) to take more of the stress and thus carry the weight without damaging the crane. (I don't know shit about cranes, I work in an office job) |
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Quoted:
Top of the jib is disconnected due to the amount of weight that is being carried and the stress that is exerted. By allowing the top to be disconnected you allow the cables (which have some elasticity) to take more of the stress and thus carry the weight without damaging the crane. (I don't know shit about cranes, I work in an office job) I think you're onto something |
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Dunno, but now I'm curious. Tagged. Hard to see the counterweight setup. He said what ever is wrong with it would be shown in the pictures so I don't think the counter weight is part of it. He also said it's only a potential problem and that it does not have anything to do with the jib not being connected along the top. |
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For extra credit in my Construction methods class we were asked these questions: What is a potential problem with how this crane is erected? What item is missing that is usually attached to a tower crane? Why is the top of the jib disconnected? 1. Gravity. She can be a bitch sometimes. 2. Needs More counterweight. 3. Beats the hell out of me. |
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Problem:
1. No counterweights. Without the proper counerweight system, the crane can not pick up objects safely. 2. Not that it is erected over a power line, but the boom can MOVE over the power line. OSHA requires a minimum of 20 feet of clearance between power line and ANY part of the boom, including the fast line or main block The structure is a lattice boom type, which means that the crane is brought to the job site in pieces and then built there. The triangle type boom gives strength. The opening you see is due to the fact that a piece of the crane is not in place, which means that the crane is in the beginning stages of assembly or disassmebly. The boom needs to be stabe for both. |
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Problem: 1. No counterweights. Without the proper counerweight system, the crane can not pick up objects safely. 2. Not that it is erected over a power line, but the boom can MOVE over the power line. OSHA requires a minimum of 20 feet of clearance between power line and ANY part of the boom, including the fast line or main block The structure is a lattice boom type, which means that the crane is brought to the job site in pieces and then built there. The triangle type boom gives strength. The opening you see is due to the fact that a piece of the crane is not in place, which means that the crane is in the beginning stages of assembly or disassmebly. The boom needs to be stabe for both. There are counter weights, they're just cut off in the picture. I agree about the power line thing. That piece is disconnected on purpose, were supossed to find out why it is. |
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Out of curiosity, how does the driver climb up there? Just works his way up the latticework, or is there a ladder or something? There's a ladder Yep. The operator is also required to wear fall proctecion when he has to climb 6 feet or more off the ground. Wow. Wish I could hellp more. That is the only time I have ever seen the jib like that, during initial construction or takedown. I may have to ask my senior operator. |
