[TowerTalk] FW: Crank up questions.

[Gary]

Pictures!  Please!
 
> From: EZRhino at fastmovers.biz
> Date: Wed, 27 Nov 2013 08:39:29 -0700
> To: K8RI-on-TowerTalk at tm.net
> CC: towertalk at contesting.com
> Subject: Re: [TowerTalk] FW:  Crank up questions.
> 
> Due to the position of my tower being very close to my house, I had to build my own raising fixture.  It wasn't hard...two 8' 4x4 posts bolted together in an A frame, standing vertically behind the tower baseplate, and two more 16' 4x4's that bolt to the top of the A frame and go forward and down to the ground like big grasshopper legs.  A Fulton 2550 winch bolted to the A frame did the lifting duty.  The cable went up around a pulley, then down to the tower and back up (2:1).  It wasn't hard to lift (I used a long 1/2" ratchet as the handle to the winch), and was stable under load.  I'm keeping all the parts since that is the only way of getting it down!
> 
> Chris
> KF7P
> 
> On Nov 27, 2013, at 2:12 AM, Roger (K8RI) on TT wrote:
> 
> > On 11/27/2013 3:28 AM, Matt wrote:
> > 
> > A raising fixture similar to the commercial ones is very easy to build. Whether the tower will easily adapt to one is something else, but with a little ingenuity should work.
> > 
> > 73
> > 
> > Roger (K8RI)
> > 
> >> This may or may not be of use to you but thought I would offer an
> >> alternative.  I have 4 cranks-ups and 2 don't have raising fixtures.   For
> >> each of these without fixtures I elongated the foundation excavation and
> >> dropped a 20 ft stick of schedule 40 pipe centered at the appropriate
> >> location prior to placing concrete.  I welded cap plates and reinforced
> >> mountings for a 2-ton chain hoist at the top of each of these the pipes.
> >> Suggest to do the stress and flexure analysis on the lifting loads for the
> >> tower before sizing the pipe.   I ended up with 6" pipe on one installation
> >> and 8" on the other (a larger HD tower).  On the advice of my structural
> >> engineering friend, I fabricated the rebar cages with additional "U" straps
> >> wrapped around the pipe on a 2" larger radius tied back deep into the center
> >> of the concrete with angle turnouts on the ends.  - and doubled up on the
> >> spacing through the bottom (and top for good measure) few feet of the
> >> foundation.   This is to strengthen the foundation for the side loads (ie
> >> avoid blowing out the side of the foundation at the bottom corner) that are
> >> imparted when the pipe is under bending stress.
> >> 
> >> To raise or lower the tower I just hang the chain hoist on the pipe, connect
> >> to the tower and she comes right up - very sturdy.
> >> 
> >> Good luck on your tower project.
> >> 
> >> 73
> >> Matt
> >> KM5VI
> >> 
> >> 
> >> 
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> >> 
> >> 
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