Prolyte Campus blog: Slinging methods, do we know 'm all?

Slinging methods: do we know ‘m all?

The topic of slinging entertainment trusses has been hovering over the market for about three decades. Mainly because the open character of the truss structure allows for so much more ‘routes’ for a sling compared to the ‘classic’ solid beams…

The issue: Slinging of trusses is of course not the most common cause of accidents that involve truss structures. Beyond any doubt that would be overloading of the truss span itself or overloading of a chain motor. Negligence in planning or maintenance does play a role. And in outdoor situations it is undoubtedly wind, wind or wind. But slinging does play a role for the internal forces in the truss module members. And at one point this can lead to stresses causing failure, either as a direct collapse or in a fatigue induced manner.

The answer: When categorizing the pro’s and con’s of method variations it must be clear which one is discussed, so a name (or rather a …number) is needed. 15 years of collecting slinging methods still has not reached a ‘saturation’ point: every year of few ‘new variations’ keep popping up. Below some examples are shown of over 200 slinging variations on a square truss, with one sling only in a ‘basket’ set-up.

 

The verdict: It looks like imagination has no limits and some should really be in a Museum of Modern Art. To be continued.

 

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Our experiences with this new ProLyft system are really positive. Rigging and outlining line-array systems is now very fast and accurate. Furthermore, the installing teams we’re a pleasure to work with.

Arnold van Duijn Chief Operational Services, Concertgebouw Amsterdam