a pair of 3t WLL webbing slings being used to lift a 1t load. The risk of this happens increases when the working load limit (WLL) of the sling (therefore, the width of it) is unnecessarily high e.g. I have seen and heard of webbing slings moving on a load, even when double-wrapped, and particularly on loads of small diameter. Also, consider the effect on the friction/grip of webbing slings on a smooth surface when the slings are wet. Why are webbing slings designed the way they are? As in, why are they flat and wide? They are designed this way to minimise the pressure applied to the load. ![]() If a similar incident were to occur when a double-wrap choke hitch (shown in top photograph) is used, the inner wrap would bind more tightly to the load and hugely increase the likelihood of the load remaining secure and able to be recovered safely.Īnother common trend is to use flat webbing slings for scaffold tubes and other bundled loads. The result - a shower of steel tubes raining down on to whatever or whoever is below. If slung using a single-wrap choke hitch and one end of the load was to snag on something during raising or lowering, or even if the bundle was to 'bunch up' during the lift, there is potential of parts of the load sliding off of the top of the bundle, or worse, the slings could move and the whole load be released. 'double-wrap') binds the load together tightly like a constricting band (see top photograph). Applying a second turn around the load with the sling (i.e. ![]() You can see in the bottom photograph that the 'single-wrap' leaves room for movement of parts of the load (scaffold tubes in this case) beneath the choke. Why a 'double-wrap choke hitch' is safer. a 'single-wrap choke hitch' (see bottom photograph). Well, don't take it for granted.ĭuring the course of carrying out site audits and mentoring visits over the past couple of years, as well as during the years of being active in lifting operations' roles prior to becoming a trainer, I've witnessed scaffold tubes being lifted a number of times using a slinging method that does not provide adequate load security i.e. With bundled loads being included as part of the Slinger/Signaller ('Rigger') test for the UK's most widely recognised qualification card scheme, and best slinging practice for such loads apparently being commonly understood, it would be fair to consider that a pack of scaffold tubes is almost guaranteed to be lifted safely by 'qualified' personnel on our construction sites. ![]() Scaffold tubes.perhaps the most common example of bundled loads on the construction site.
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