[Towertalk] 25GSSB New? Baseplate

[Jim White]

this is how heavy equipment is installed in commercial buildings, big 
air-conditioning handlers, etc.  ... then

what is called grout is added under the plate...

grout is a very flowable version of "concrete" - a small form is made on 
top of the pour and the grout is then mixed and placed into that form ...

grout is VERY fluid and will flow into even the center of your plate ... 
once it sets you will have the weight being able to be spread out over a 
large area ...

just prior to doing the grout verify not that the plate itself is level 
- not by checking it - but, by installing the first section of tower and 
making sure that IT is plumb! there may be small irregularities in the 
length of the plate's stubs that slip into the legs or their welding 
which could translate to the plate itself being level but the tower 
section being crooked - which is really what this is all about!

K4OJ





Chris BONDE wrote:

> At 08:11 AM 2002-08-01 -0400, K7LXC@aol.com wrote:
> 
>> In a message dated 7/31/02 4:44:43 PM Pacific Daylight Time,
>> weightdn@adelphia.net writes:
>>
>> > Still thinking about going to the heavier
>> >  bolts though. I guess that in reality the primary function of the 
>> baseplate
>> >  is to keep the base of the tower on the concrete pad and support 
>> the tower.
>> >  Sooo, if everything else is ok the diameter of the bolts should be
>> >  relatively (within reason) insignificant.
>>
>>     Correct. And the concrete base's function is to basically keep the 
>> tower
>> from sinking.
> 
> 
> I thought that the concrete was mainly to lower the centre of gravity 
> for the complete antenna structure
> 
>> >  The alignment will certainly have to be right on with only 1/16 
>> clearance.
>>
>>     Which alignment are you referring to? You mean horizontal levelness?
>> Plumb? The easiest thing to do to insure plumb is to put nuts and 
>> washers on
>> the anchor rods first, then the plate, and then another set of nuts and
>> washers. That way you can use the bottom nuts as leveling nuts.
> 
> 
> Such common sense that is not common.  I really like this idea.  The 
> only question would be the plate would have to be thick or strong enough 
> to bear the weight of the tower on three points, the leveling nuts, 
> rather than the whole base.  This is the bases of the three legged cow 
> milking stool.
> 
> Chris opr VE7HCB
> 
> 
>> Cheers,
>> Steve    K7LXC
>> TOWER TECH
>>
>> >  The drawing on the Rohn website
>> >  does not show the size of the holes in the hinged base. Any comments?
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> 
> 
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> an additional 5 percent off
> any weather station price.
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