Table 2-4. Recommended Torque Values for Stainless Steel Fastener Hardware

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.

b. Brace Installation. Refer to figure 2-4 (sheets 2,

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