| Author |
Message |
    
Bigredhogs
New member
Username: Bigredhogs
Post Number: 2
Registered: 11-2006
| | Posted on Tuesday, March 06, 2007 - 9:34 pm: | 
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I have just purchased a 88 ft crank up tower. This is a Tristao Tower. Model # T-588. Does anyone know the best way to mount these kind of towers. |
Bruce
Senior Member
Username: Bruce
Post Number: 4372
Registered: 9-2003
| | Posted on Wednesday, March 07, 2007 - 6:16 am: |
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Try doing a GOOGLE search at www.google.com for US TOWERS
I understand thoes towers were made by them. |
Tech833
Moderator
Username: Tech833
Post Number: 1619
Registered: 8-2002
| | Posted on Wednesday, March 07, 2007 - 10:04 am: |
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Get or make a base plate and dig a big hole! Use levels every 12 inches apart of rebar all around the edge of the hole and then through the middle (should look like a cage). When you pour the base, use 6-sack mix. It's the same concrete they use for overpasses and bridges. |
Sonny
Intermediate Member
Username: Sonny
Post Number: 150
Registered: 5-2004
| | Posted on Wednesday, March 07, 2007 - 5:00 pm: |
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Dig a very big hole my us tower 33 ft. crankup called for a 5ft. x 4ft x 4ft. and rebar like Paul/Tech833 said  |
Tech833
Moderator
Username: Tech833
Post Number: 1621
Registered: 8-2002
| | Posted on Thursday, March 08, 2007 - 11:00 am: |
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My Rohn free-stander is only 45 feet high, but for 110 MPH windloads, called for a hole 6x6x6 of concrete and rebar.
With a free-standing tower, it is important to make the base heavier than the tower. On a guyed tower, you only want to make sure the tower won't sink into the ground from the wieght and the downward pull force from the guy wires. |
Sonny
Intermediate Member
Username: Sonny
Post Number: 151
Registered: 5-2004
| | Posted on Thursday, March 08, 2007 - 4:09 pm: |
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I stand corrected Paul |
Tech833
Moderator
Username: Tech833
Post Number: 1622
Registered: 8-2002
| | Posted on Friday, March 09, 2007 - 10:40 am: |
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I didn't correct you! Your answer can also be correct, it depends on the windload you are designing the base for.
In any case, you are much better off over-engineering the base rather than under-engineering it. |
Moderator136
Moderator
Username: Moderator136
Post Number: 399
Registered: 4-2005
| | Posted on Saturday, March 10, 2007 - 1:55 pm: |
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Bigredhogs Thats a big crankup freestanding tower! Also congratulations on your new tower.
I did what Tech 833 did. Built a 4'x 4' 6' deep cage with rebar reinforced cement pad. Also the tower has guy wires. (its not a crankup tower. 50'freestanding) WE have winds here in Iowa 75 to 80 mph is not uncommon.There is alot of windload on the tower itself let alone a big beam . (my beam is 30'x 20'at 56'tall tower) So far its still there --knock on wood.
Im with Tech 833 over-engineering to be safe.
Have fun with the new tower and let us know how the project gos
73
Hal
Moderator136
KCØSVC
CEF#136/HAM#23
CVC#004#
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Sonny
Intermediate Member
Username: Sonny
Post Number: 153
Registered: 5-2004
| | Posted on Monday, March 12, 2007 - 4:35 pm: |
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My 33 foot crankup from US tower with 5x4x4 hole
is engeneered for 100mph winds fully extended but if winds or a strong storm is headed I lower it down to it's retracted hight of 11 feet, if I want to work on the beam I also can tip it over close to the ground with the raising fixture |
