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CHAIN SLINGS......SPECIAL APPLICATIONS FOR MORE COMPLICATED LIFTING
Posted : Thu 24th Sep 2009 @ 12:36CHAIN SLINGS........SPECIAL APPLICATIONS FOR MORE COMPLICATED LIFTING
CLAMPING FORCE:
Multi leg chain slings impact a "clamping force" or a compressive force on the load, this increases as the included angle is increased. This force is also increased in the type of sling where the hooks are threaded on a loop chain. The slinger must be aware of this force and use it to his advantage, and avoid the dangers which it may cause. For example, with this shape load (see diag) the clamping force is used to good effect ensuring the hooks are clamped tightly to the load.
Some cases have arisen whereby the load has not been rigid enough to withstand the clamping pressure. The slinger should take steps to reduce the clamping force in the case of crushable loads, e.g. lightweight frames.
COMBINATION SLINGS:
Steel joistasand concrete beams etc. can be lifted with a 2 leg sling in a choke hitch but if the work is repetitive it is much better to use 2 short reevable collar slings in conjunction with a 2 leg sling as shown. The reevable collar slings are easier to move about under the load and are cheaper to replace when worn.
When you use combination slings they must both have the same sized chain.The complete combination should be treated as a 2 leg sling in a choke hitch.
Large packing boxes and similar shaped loads can be handled by a double basket sling but an easier way is to use a 4 leg slind in combination with 2 reevable collar slings making sure the chain size is the same, this combination can be rated as a double basket sling.
OFF BALANCE LOADS:
Some loads are asymmetrical and do not balance at their centre of gravity, and therefore tilting occurs. If the shape of the load permits the sling should be positioned equally about the centre of gravity to ensure a safe horizontal lift. The accomplished slinger will be able to estimate the centre of gravity and therefore know where to position the slins.
If An off balance load is fitted with a sling attached in a way that the crane hook is not straight above the centre of gravity the load will tilt until the centre of gravity is directly below the crane hook. In this case the sling leg nearer the heavy end will be withstanding a greater force than the leg at the lighter end.This situation could become progressively more extreme until one leg is supporting the nearly all the load while the second leg is only steadying the load.
Due to the varying shapes and sizes of loads it is impossible to give accurate guidance in lifting these loads, but the slinger should be aware that when handling an off balance load the leg at the tilted heavier end can be supporting up to 100% of the weight of the load, so the sling should be chosen which is capable of supporting the weight on one leg.
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