Figure 2-2. Tower Pier
c. Upper Tower Leg Installation.
(4) Attach eight cable braces (19) between
the two levels of horizontal braces. Do not tension
cables at this time.
erection fixture (I) as follows:
(5) Install a third level of three horizontal
(a) Assemble block (2), hoist line (9),
braces (16) and one horizontal brace (23). Secure with
tension sling (8), and tag line (7) as shown.
eight 3/4-inch bolts (14), hex nuts (12), and locknuts
(b) Slide upper and lower supports (3)
(13). Do not torque hardware at this time.
over any two horizontal braces.
(6) Install four corner braces (26) to the third
(c) Tighten two thumbscrews (6) to
level of horizontal braces. Secure with two 1/2-inch
clamp supports in position.
bolts (27), hex nuts (28), and locknuts (29) for each
(d) Insert two lockpins (4) to safety lock
upper and lower supports. Secure with two hitchpins (5)
(7) Install three joint braces (17) and one joint
for each pin.
brace (24) to lower tower legs. Be sure to locate joint
brace No. 1 on the same face as horizontal brace No.
The erection fixture, when properly
2. Secure with six 3/4-inch bolts (11), hex nuts (12), and
secured, may be used to raise all
locknuts (13) for each joint brace.
equipment to the required height.
The gin pole pulley and hoist lines
may be used to raise the braces.