[TowerTalk] Old HWS671

[W5CPT]

I would use a 1/4" shackle (which has a 5/16" pin) to attach what ever you were going to use to get the tower upright.  A 1/4" shackle has a working load of 1000 lbs, which should be more than enough since you are not dead lifting the tower.  

see this link:

http://turnerseymour.thomasnet.com/viewitems/hardware/screw-pin-anchor-shackles?&plpver=1001&forward=1

Clint - W5CPT


  ----- Original Message ----- 
  From: Art 
  To: towertalk at contesting.com 
  Sent: 03 December, 2009 7:58 PM
  Subject: [TowerTalk] Old HWS671


  I'm about to pull a HWS671 vertical. There's a pad welded on the outer 
  section. For those with an erection fixture it was used to install a 
  pulley wheel to winch up the tower. I don't have a fixture, but I do 
  have a tractor that I intend to pull it up with. The plan is to use 1/4 
  inch 7x19, same stuff the tower uses, on a thimble around a bolt through 
  the pad ordinarily used for a pulley with the erection fixture.

  The question is, what grade of bolt do I buy that will pull it up and 
  not break? I see it as a fight between ductility and brittleness, grade 
  8 being brittle for shear loads like this. The hole is for a 5/16 -- 
  which seems a bit small to yank up this tower. I'm sure it used to work 
  when these towers were new 30-40 years ago. The alternatives are, drill 
  out the hole for a bigger bolt or use a chain, either one putting the 
  galvanizing at risk.

  HWS671 is a 4 section 71 ft middling strong crankup weighing about 1400 lb.

  73 Art
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