TM 32-5985-342-14&P
Table 2-4. Recommended Torque Values for Stainless Steel Fastener Hardware
Diameter in inches
Torque values
1/4
79 in-lbs
5/16
138 in-lbs
3/8
21 ft-lbs
7/16
33 ft-lbs
1/2
45 ft-lbs
2-10. TOWER PIER INSTALLATION. Lay out the
(2) Level all nuts with surveyor's transit or
tower pier locations and the hoist location with a transit
spirit level.
to the dimensions shown in figure 2-1. The size of the
(3) Hold bottom (flange) end of lower legs
tower piers and the amount of reinforcement steel must
(1,2) in position on top of pier.
be determined by considering the soil conditions and
(4) Raise each of the four legs to an upright
vertical loads. Proceed as follows:
position.
a. Dig the pier holes and set the top of the forms
(5) Secure each leg to pier bolts with one hex
with a level (figures 2-2 and 2-3).
nut (4) and locknut (3) on each bolt.
b. Wire in the reinforcement steel as required.
CAUTION
3, and 4 of 5).
Float a fine grain surface on the top
(1) Install three bottommost horizontal braces
of the piers. Allow a minimum of 28
(16) and one bottommost horizontal brace (23) to lower
days for the concrete to cure before
tower legs. Secure with eight 3/4-inch bolts (14), hex
erection of tower.
nuts (12), and locknuts (13). Do not torque hardware at
c. With the aid of a template, place the pier bolts
this time.
and hoist bolts into position while the concrete is still
NOTE
soft. Refer to figure 2-1 for template hole patterns.
Be sure to follow brace hole patterns
2-11. TOWER INSTALLATION. The tower is installed
as shown in figure 2-4, (detail G,
with the equipment listed in table 2-2 and with common
sheet 4 of 5).
hand tools, such as wrenches and screwdrivers. Total
(2) Install three horizontal braces (16) and
installation time, once the foundation and anchor
one horizontal brace (23) (located approximately 5 feet
hardware are readied (paragraph 2-10), is approximately
above the ground) to the tower legs. Secure with eight
3 days for three erection personnel. The following step-
3/4-inch bolts (14), hex nuts (12), and locknuts (13). Do
by-step sequence should be followed to satisfactorily
not torque hardware at this time.
install the tower in the minimum time.
(3) Install four corner braces (26) to each
a. Tower Leg Installation. Refer to figure 24 (sheet
level of horizontal braces (total of eight comer braces).
2 of 5).
Secure with two 1/2-inch bolts (27), hex nuts (28), and
(1) Screw one hex nut (4) onto each pier bolt
locknuts (29) for each comer brace.
imbedded in concrete.
2-4
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