Figure 8-31. - Square self-supporting tower and base.

2. Check all of the surface areas for proper preservation. Cover a11 of the holes and dents in galvanized materials with sinc chromate or another acceptable preservative to prevent deterioration.

3. When high-strength bolts are used in a tower assembly, place a hardened steel washer under the nut or bolt head whichever is to be turned. Care must be exercised not to exceed the maximum torque limit of the bolt. Maximum torque values of several different sizes and types of bolts commonly used in antenna towers are listed in table 8-2.

ERECTION OF GUYED TOWERS

The following paragraphs present methods that have been successfully used to erect guyed towers. 'Ihe most practical method for any particular tower

Table 8-2. - Bolt Torques (foot-pounds)