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Table 1: Pull-up Force and Cable Travel
These loads are static loads. Bouncing or shock loading can cause higher momentary
loads. We recommend using at least 3/16" steel wire rope for the lifting. We also rec-
ommend a 2:1 pulley block arrangement to reduce the line tension for the 25 and 32
meter towers. A 2:1 pulley block will cut the pull-up force in half. The pulley block is at-
tached to the gin-pole shackle or snap-link. Please remember that using a 2:1 pulley
will double the pull-up cable travel to 86 ft on the taller towers.
WARNING: If a winch is used, we strongly recommend that a worm-gear type be
used and that a spur-gear type be avoided. A worm-gear winch is in-
herently self-locking and cannot free-spool like a spur-gear type
winch.
WARNING: If using a tractor or truck, extreme care must be exercised. Use a
pulley block at the lifting anchor. Never attach a cable from a truck or
tractor directly to the gin-pole end. Proceed slowly and smoothly.
Step 12:
Walk the gin-pole toward the vertical position while taking in the slack with the lifting de-
vice. When the gin-pole is nearly vertical, all the lifting wires should be tight. If using a
drum winch, try to guide the cable onto the drum so that it is distributed evenly across
the surface of the drum.
Step 13:
Use some tape to secure the tower electrical wiring at the top end of the tower so that it
will not slide down the tower when the tower is raised.
Step 14:
Lift the tower 4' to 8' above the ground to check the operation of the lifting device and
the security of the lifting and guy cables. The side guy wires must be tended to prevent
the tower from bowing or falling off to one side or the other. In addition to checking the
security and adjustment of the guy wires, check the lifting anchor for movement. If the
gin-pole anchor will not hold, the soil is too poor for this type of anchor or the depth of
the anchor was insufficient. The maximum lifting force is experienced when the tower is
first lifted from the ground.
Pull-up
Height
Force
(ft)
(lbs)
59
750
78
1,150
97
1,550
Pull-up
Cable
Travel (ft)
30
43
43
17
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