Figure 8-35. - Erection plan for a pivoted tower.
of a tower that has an attached pivoted base in a horizontal position preparatory to hoisting. The thrust sling shown counteracts the thrust on the base foundation from hoisting operations. Rigging operations and location of personnel essential to the raising of a pivoted base tower are detailed in figures 8-35 and 8-36. Light towers in lengths of approximately 80 feet may be raised with a single attachment of the winch line. However, longer towers frequently are too flexible for a single attachment, and, in this case, a hoisting sling, furnished with a snatch block, allows for two points of attachment. The gin pole is mounted close to a concrete tower base and is provided with atop sheave to take the winch line. Permanent guys, attached to the tower at three elevations, are handled by personnel during hoisting operations, as shown in figure 8-35. Temporary rope guys, provided with a snatch block anchored to deadmen, furnish the necessary lateral
Figure 8-36. - Erection of a pivoted guyed tower.Continue Reading