![]() ![]() That assumes you have enough hook height with the crane chosen for the lift - if not, I've seen angles as low as 45* used, but that requires some extra thought. But if not, the slings will come in increments of 10' length (in the US), and the length is typically chosen so that the angle between the horizontal beam and the sling are at least 60* to keep the axial load in the beam reasonable. Regarding the slings above the beam - for a rented beam, these may be part of the package. Note that there are testing and special fabrication requirements for below-the-hook devices (like lifting beams) that make that more onerous and expensive than a typical construction device. But sometimes, you need a custom geometry (so the slings below the spreader can be straight) or more capacity than is widely available - and then a fabricated beam may be required. If an appropriate beam can be rented or pulled out of a contractor's yard, that's by far more economical. Off the shelf vs fabricated is a matter of application. Agreed with NS4U, I've always thought of the Ricker paper as the benchmark for straightforward. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |