- #1

- 5

- 0

## Main Question or Discussion Point

I am getting a bit older, and I have a Aluminum Communications Tower, and used to angle it up by myself from the back of the house to the side. Now I would like to lift the tower to its vertical position on the side of the house using the existing aluminum angled bracket plasma welded to a aluminum plate with six stainless bolts through siding and three 2x4s (Part of the framing of the house) at a height of 17 Ft. and 4 inches, pulley, a steel cable, and winch.

Here are the variables;

Aluminum tower weighs 100Lbs.

Height is 21 Ft. 2" in the collapsed position.

The tower tilts at the bottom of the base from near horizontal to its vertical position.

At the tower's vertical point is the plasma welded side bracket, and is where I would like to place a stainless steel pulley.

My Questions:

1 - Since the aluminum bracket is mounted to the side of the house perpendicular to the tower to lift, some lag bolds will see greater stress than others, how much force is exerted, worse case, on the pulley and plasma welded side bracket on the side of the house? pull in Lbs.?

2 - What strength stainless steel cable should be obtained?

3 - Can the winch be mounted on the same tower 2 or 3 feet above the base efficiently?

4 - What would be the formula (is this a Derrick Boom)?

5 - Are there any other concerns to be considered?

Even simpler, we have Triangle, A, B, and C; ----> A is the Base, B is the wall mount bracket, C is the end of the tower. Leg A and C weight is 100 Lbs. Height from A to B is 17 Ft. and 4 inches vertical, the distance from A to C (Horizontal Tower) is 17 Ft. and 4 inches as well since the cable will be also connected at 17 Ft and 4" making it an Isosceles Triangle.

What is the Worse Case Stress on the Cable going from B to C and Pulley as the tower gets cranked up?

Here are the variables;

Aluminum tower weighs 100Lbs.

Height is 21 Ft. 2" in the collapsed position.

The tower tilts at the bottom of the base from near horizontal to its vertical position.

At the tower's vertical point is the plasma welded side bracket, and is where I would like to place a stainless steel pulley.

My Questions:

1 - Since the aluminum bracket is mounted to the side of the house perpendicular to the tower to lift, some lag bolds will see greater stress than others, how much force is exerted, worse case, on the pulley and plasma welded side bracket on the side of the house? pull in Lbs.?

2 - What strength stainless steel cable should be obtained?

3 - Can the winch be mounted on the same tower 2 or 3 feet above the base efficiently?

4 - What would be the formula (is this a Derrick Boom)?

5 - Are there any other concerns to be considered?

Even simpler, we have Triangle, A, B, and C; ----> A is the Base, B is the wall mount bracket, C is the end of the tower. Leg A and C weight is 100 Lbs. Height from A to B is 17 Ft. and 4 inches vertical, the distance from A to C (Horizontal Tower) is 17 Ft. and 4 inches as well since the cable will be also connected at 17 Ft and 4" making it an Isosceles Triangle.

What is the Worse Case Stress on the Cable going from B to C and Pulley as the tower gets cranked up?