SUMMARY OF TOWER ERECTION.

TM 32-5985-343-14&P

Pass tools and materials by using appropriate containers

2-10 SUMMARY OF TOWER ERECTION.

or ropes.

i. When hoisting equipment, the operator shall not

NOTE

be permitted to perform any other work. He shall not

Erection

personnel

must

leave controls until the load has been safely attached or

thoroughly familiar with installation

safely lowered to the ground.

instructions

before

attempting

j. Only the erection gear prescribed in this manual

erection of tower.

shall be used without consulting a civil engineer. All

other erection and installation procedures must be

a. Tower is assembled on the ground as follows:

approved by a civil engineer.

(1) Tower section No. 1 is assembled.

2-12 ASSEMBLY OF TOWER. Only the equipment

(2) Tower section No. 1 is attached to tower pivots

listed in table 2-2 and common hand tools, such as

and raised.

wrenches and screwdrivers, are needed for assembling

(3) Gin pole is attached.

the tower. The step-by-step procedure that follows

(4) Tower section No. 1 is lowered.

enables rapid and accurate assembly of the tower.

(5) Tower sections Nos. 2, 3, and 4 are assembled

and attached.

a. Tower Section No. 1. Refer to figure 2-4.

(1) Screw 126 tower step bolts (2, sheet 1) tight

b. If elevator tracks are available when tower is

against all tower leg assemblies (1, sheet 1) A, B, and

erected, they are attached while tower is on the ground.

C. Refer to detail of tower step in figure 2-4.

c. Tower adapter is attached to rest of tower.

(2) Attach tower support to pier A and hold in

d. Tower is raised.

place with eight nuts (18, sheet 2) and lockwashers (19,

e. Elevator tracks are installed if they were not

sheet 2). Do not tighten these pier nuts (18, sheet 2)

available before tower was raised.

until the tower is raised later.

f Carriage is assembled, mounted to the tower, and

antenna is erected.

CAUTION

Be sure that right and left tower

2-11 SAFETY PRECAUTIONS. The following safety

pivots are not 1800 out of alignment.

precautions shall be observed before and during

Otherwise pivot assemblies may be

installation of the Antenna Tower TS-IA:

damaged when the tower section is

raised.

a. Be familiar with the usual safety precautions and

safety equipment that are used when handling structural

(3) Attach tower base pivot assemblies (20, sheet

steel.

2) to pier B and C and secure with 16 nuts (18, sheet 2)

b. Maintain erection tools and equipment in safe

and lockwashers (19, sheet 2).

condition, especially lifting and safety gear.

(4) Face A will be assembled first. Lay out tower

c. Take special care when handling structural steel in

legs B (1, sheet 1) and C (1, sheet 1) on the ground.

icy or wet weather. The steel is likely to be slippery

Attach tower braces Nos. 1 (10, sheet 1) and 2 (12,

under these conditions.

sheet 1) to tower legs and secure with four bolts (3,

d. Wear gloves and other protective clothing when

sheet 1), nuts (4, sheet 1), and lockwashers (5, sheet 1).

handling structural steel in extreme cold. Unprotected

Secure crossover junctions of braces with two bolts (6,

skin can freeze onto very cold steel.

sheet 1), nuts (7, sheet 1), and lockwashers (8, sheet 1).

e. Secure partial assemblies against high winds at all

(5) Hoist up leg B (1, sheet 1), with leg C (1, sheet

times during erection.

1) on the ground serving as an axis, so that the second

f Do not use tower hoist as a hoist for persons.

side, face B of the tower section, can be built on the

Required safety devices for personnel are not provided

ground. Repeat step (4) to assemble face B.

for this hoist.

g. Truck winch and winch cable used for raising

WARNING

assemblies and restraining tower during erection must

have minimum work load rating of 1 ton. Winch truck

When working on structural tower,

must be capable of effectively braking, lowering, and

use safety climbing belts and pass

safely holding this 1-ton load.

tools and materials by using

h. When working on structural tower, use safety

appropriate containers or ropes.

climbing belts and hold tools and materials in

containers.

2-11