Thanks Dhenger for the input. You are correct on all instances. The shackles do in fact only give minor adjustments but with loads like this that is all that is usually needed. The rigging contractor or ourselves usually have a wide variety of spreader bars and rigging. So we would have 18'...
I have done many calculations figuring the tensions on the slings and the upper angles of spreader bars. Maybe it is required to figurethe lower slings as well so I will work on that. The main thing about the lower slings is that they will be in the vertical position and no angle on them so...
Here is a picture of the spreader bar arrangement. The back crane is using the 3 spreader bars. The lowest slings that attach to the load will have shackles added depending on where the CG of the load is, this allows the load to pick level as well as not damage the structural integrity of the...
Thanks Desertfox for the reply. As far as calculating the sling length or tension with the use of a 4 way that is a differnet situation. What I am tlalking about is picking up a skid or module based structure. So imagine a box that is 40 feet long 15 feet wide and 15 feet tall. You will have...
If you are able to do the calculations on paper I would suggest doing them in a excel file. This way youu can just change the dimensions of the excavation and the math will already be done. Using someone elses tool to do the calculations for you will in the end cripple your performance. Do it...
There was a question in a thread that is now closed but there was no solution to the Rigging question that was asked. Itwas what is the tension on a sling with the load and angle known. I have made this simple spread sheet to calc it. You can input the Weight and angles and it will calculate...
