Figure 8-32.Triangular tower foundation.
will be determined by the size, the weight, and the
construction characteristics of the tower and by the
Lightweight guyed towers are frequently erected
with a davit hoist that is anchored to the previously
erected section, providing a pivoted hoisting arm. The
davit arm is swung away from the tower in hoisting
the added section and swung centrally over the tower
in depositing the section before bolting up the splice
plates. Figure 8-33 shows a ground assembled unit
being hoisted for connection to a previously erected
tower section. A snatch block, secured to the tower
base, transmits the hoisting line to a source of power
Figure 8-33.Typical davit installation.
or hand winch. A tag line, secured to the base of
section being hoisted, avoids possible contact with the
erected portion of the tower.
Gin Pole Method
Light triangular guyed towers, furnished with a
pivoted base, may be completely assembled on the
ground and then raised to a vertical position with the
aid of a gin pole. Figure 8-34 shows the lower section
Figure 8-34.Pivoted tower-hoisting preparation.