Pictures! Please!
> From: EZRhino@fastmovers.biz
> Date: Wed, 27 Nov 2013 08:39:29 -0700
> To: K8RI-on-TowerTalk@tm.net
> CC: towertalk@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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> >
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