pole. Proceed to attach a shackle to the top vacant hole
in the gusset plate and have a snatch block in the
shackle. Open the snatch block and insert the fiber line
to be used as a hoist line. Tie a bowline in the end of
the line to keep it from slipping through the block
Take the line to be used as the tag line and secure one
end to the bowline. Now, secure a snatch block to the
base of the tower, and run the hoist line from the top
snatch block to this block. Be sure the snatch block at
the base of the tower is located in a straight line to a
source of power. The source of power can be a dump
truck, a weapon carrier, or some other vehicle.
NOTE: When using a vehicle as a source of
power, you must keep it back far enough so that as it
comes forward, it does not arrive at the base of the
tower before the load is on the ground.
The tower is dismantled by sections, and the top
and second horizontal braces are the first members of
the section to be removed. Start by tying the hoist line
and tag line to the horizontal braces. Then signal the
vehicle operator to back up and take a strain on the
hoist line. You are now ready to remove the bolts,
holding the horizontal braces in place. After all of the
bolts are removed, lower the horizontal braces to the
ground. Now, remove the diagonal braces in the same
The next step is to remove the legs of the tower
section, except the leg being used as the gin pole. First,
shinny up the leg to be dismantled and hang a shackle
at the top. Tie the hoist line to the shackle and then
come back down the leg. Signal the vehicle operator
to take a strain on the hoist line-just enough strain to
take up the slack Remove the gusset plate from one
side. Remove the remainder of the bolts that hold the
leg being removed, leaving the two top bolts in place.
Now, take the tag line and secure it with a clove hitch
and a half hitch to the bottom of the load. Also, take a
turn with the tag line around the horizontal bracing in
the section that will be removed next. You should then
remove the two top bolts as you slack off on the tag
line and take up on the hoist line until the leg is
hanging straight up and down against the gin pole.
Release the tag line to the personnel on the ground who
will guide the load, as it is lowered to the ground.
Repeat this process with all of the remaining legs until
only the ladder and the leg used as a gin pole are left.
To remove the ladder, secure the hoist line to a rung
above the center. Remove the bolts and then lower the
ladder to the ground.
When you are ready to start dismantling the leg
used as the gin pole, shinny up the leg and remove the
hoist line from the snatch block. Secure the hoist line
to the shackle. Remove the snatch block and hang it in
your safety bit. Then come back down the leg to the
spliced connection. (Generally, at all spliced
connections, there will be horizontal brace
connections that can serve as working platforms.)
Signal the personnel on the ground to remove the hoist
line from the base snatch block; then signal the vehicle
operator to take up the slack. Remove the rivets and
the gusset plate from one side of the splice. Remove
the remaining bolts in the leg. After all of the bolts are
removed, ensure that all personnel are clear of where
the load will land Remove the top bolt, and release
the nut on the other bolt one-quarter turn. Signal the
vehicle operator to back up slowly. As the operator
backs up, the leg will pivot downward on the bolt and
fall against the leg it has been standing upon and which
will be used as the gin pole in dismantling the next
section. Now, insert the shackle in the top hole of the
gusset plate and hang the snatch block in it. Put the
hoist line back in both snatch blocks. With the hoist
line, throw a half-hitch below the center of the leg.
Now secure the tag line. Next, signal the vehicle
operator to give a slight strain to take the tension off
the bolt. You can then remove the bolt and lower the
leg to the ground. This completes the dismantling of
an entire section of the tower, so you can proceed to
the next section.
Repeat the above procedure with each section
until the tower is completely dismantled.
If the tower will be put up again, rather than
scrapped, a crew should be assigned to wire brush each
member of the tower after it is lowered to the ground
In wire brushing, all rust, loose paint, and the like,
should be removed from the member. Each member
should also be marked. After they are marked, the
members should be stored in a orderly manner.
Modem communications in different parts of the
world between ships, shore stations, and aircraft,
including the United States aerospace efforts, have
required that transmitting and receiving facilities
be erected all over the globe. Many times the
Steelworkers from battalion detachments will be
assigned to erect them. This section will describe some
of the common communications antenna towers that
are erected and the procedures for erecting them.