| |
| Up
Construction Electrician Basic - Electricity handbook for electricians | Next
Stowing Line |
CHAPTER 1
CONSTRUCTION SUPPORT
As a Construction Electrician you will be involved
in many aspects of construction work. This chapter
touches on a few of these, such as rigging and hoisting,
equipment movement, hazardous material,
embarkation, and tool kits. Although this chapter does
not deal with electrical work, you need to study and
refer back to this chapter for your safety and the safety
of your shipmates.
USING LINES AND SLINGS
The safety of personnel involved in rigging and
hoisting operations largely depends upon care and
common sense.
Equally important is the proper
selection of lines and slings for safe and stable lifts.
INSPECTIONS
The single most important operational check to be
made on hoisting and rigging equipment is the line and
rigging inspection. Such factors as abrasion, wear,
fatigue, corrosion, and kinking are of great significance
in determining usable life.
The only way to determine the safety of a line, its
life expectancy, and its load-carrying ability is by
regularly inspecting every foot of its length. The main
points to watch for are external wear and cutting,
internal wear between the strands, and deterioration of
the fibers.
FIBER LINES
Fiber lines are made from either natural or synthetic
fibers. The natural fibers come from plants and include
manila, sisal, and hemp. The synthetic fibers include
nylon, polypropylene, and the polyesters. The strength
Figure 1-1.—Removing line from a shipping coil.
of these lines depends on their size, the fiber used, and
the type of stranding.
Uncoiling Line
New line is coiled, bound, and wrapped. The
protective covering should not be removed until the line
is to be used. This covering will protect the line during
stowage and prevent tangling. To open, strip off the
outer wrapping and look inside the coil for the end of the
line. This should be at the bottom of the coil. If not, turn
the coil over so that the end will be at the bottom, as
shown in figure 1-1. Pull the end of the line up through
the center of the coil. As the line comes up through the
coil, it will unwind in a counterclockwise direction.
Whipping Line
The term whipping refers to the process of securing
the ends of a line to prevent the strands from unraveling
and the yarns from separating or fraying. Whippings
are made from fine twine and will not increase the size
of the line enough to prevent it from fitting the blocks or
openings.
Figure 1-2 shows the steps to follow in applying a
whipping. Make a loop in the end of the twine and place
Figure 1-2.—Proper way to apply a line whipping.
l-l
|
