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Construction Electrician Basic - Electricity handbook for electricians | Next
Inspection of Slings |
You can use single-leg slings to make various types
of BRIDLES. Two types are shown in figure 1-12. You
can use two or more single slings for a given
combination. Also, if an individual sling is not long
enough for the job at hand, you can combine two of the
single slings to form a longer single sling.
It is advantageous to have matched sets of slings
(that is, two or more of equal length) so that when it is
necessary to use more than one to hoist a load, the strain
will be equal and the load will come up evenly. You
should mark slings that are of equal length for ease of
identification. Painting the eyes of equal-length slings
the same color is one way of doing this.
In lifting heavy loads, always make a special effort
to ensure that the bottoms of the sling legs are fastened
to the load in a manner that will prevent damage to the
load. Many pieces of equipment have eyes fastened to
them during the process of manufacture to aid in lifting.
With some loads, though, fastening a hook to the eye on
Figure 1-11.—Choker hitch formed by a single-leg sling.
one end of each sling leg provides an adequate means
for securing the sling to the load.
Chafing gear (protective pads) must be used when a
sling is exposed to sharp edges at the comers of a load.
Pieces of round wood, heavy bagging, or old rubber
tires are excellent materials to use as padding.
Chain Slings
Chain slings are frequently used in hoisting and
moving heavy steel items, such as rails, pipes, wide-
flange beams, and angles. They are also desirable for
slinging hot loads and in handling loads with sharp
edges that might cut wire rope.
Steel-length CHAIN SLINGS are available
with variable type ends and lengths. Types include
a 1/2-inch (12.7-mm) size sling, obtainable in either 12-
or 20-foot (3.6-m or 6-m) lengths. This is a one-leg type
of sling with a center swivel, equipped with a grab hook
1-11
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