[TowerTalk] rigging for lifting a heavy mast?
towertalk at n4zkf.com
Fri Nov 8 08:38:26 EST 2013
We haul stuff up towers everyday with the Marline Hitch or Single Hitch as
it's called. A Little tape at the bottom so it doesn't slip in the
beginning and your off to the races.
73 Dave n4zkf
e-mail: n4zkf at n4zkf.com
AR-Cluster node: 145.05 Mhz. or telnet://dxc.n4zkf.com:23
N4ZKF/R 147.375 Mhz. Tone 103.5
On 11/8/13 8:21 AM, "Earl Morse" <kz8e at wt.net> wrote:
>>I'm going to be installing a 20' heavy steel mast in my tower (a Trylon
>>72' self-supporting tower). I will be renting a crane to lift the mast
>>and drop it from above. What >kind of rigging do I use on the mast so
>>it can be lifted up vertically, without the sling slipping up off the
>>top of the mast?
>I have always used a clove hitch with an extra turn (
>http://www.realknots.com/knots/hitches.htm#mwvsl ) which I tie just
>above center of gravity on the mast to prevent tipping on the way up.
>Never knew it was called a rolling or magnus hitch. To ensure that this
>doesn't slide I usually put a muffler clamp on the pipe for the knot to
>pull against. A 22 ft. mast is just about at the limit of my gin pole so
>sometimes I tie a tag line (loop) from the lifting line to the top of the
>mast in order to prevent tipping.
>Tie it good. If I remember right that mast weighed nearly 200 lbs and
>was quite a pull.
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