ferroequine wrote:[i]The optimum way to lift them is with the bracket attached - provided you have a big enough crane that can take the load - DON'T FORGET THE CONCRETE at the bottom of the main post! That is how they often seem to have been erected, presumably because it was easier to put the main components together on the ground (which it is).
Dismantling can turn out to be very awkward and time consuming (bitter experience speaking there) but it might be sensible to remove such things as lamp cases and the enamelled arms to avoid the risk of damaging them.
PS I'm not sure of the weights but the concrete will add somewhere between 1 and 2 tons and as the post comes out of the ground you need to watch out for corrosion on the bolts securing the concrete sections and on the post where it goes into the concrete - not so much checking for where you will go with the wire brush but keeping an eye to make sure things don't start parting company.
MDickinson wrote:I do intend to remove the arms, lamps, and as many castings as we can before lifting the signal out, as well as the ladder. I've seen ladders bent into all sorts of strange shapes because they have not been taken care of.
Speaking to our crane crew, they have suggested using a 'choke' strap around the main post rather than lifting off the bracket, in case the bracket starts moving up and the posts stays where it is!
No-one has pointed this out yet, so....
In case you're not aware, the bracket on a WR tubular is not simply clamped onto the main post. Two of the shaped castings (the upper pair I think) which appear to clamp round the post actually have a stud protruding into a locating hole drilled in the post. So loosening off and lifting doesn't work.
To get the bracket off therefore requires that you separate the front and back trusses of the bracket by an inch or two. Since this requires that everything which links the two trusses (end plates, plates under dolls, x links, platform supports...) be unbolted at least from one of them, and since some of those bolts will be seized/corroded, doing this in mid-air is not likely to be easy!
Conclusion: as others have said, strip the small stuff then lift the bracket and post as a unit if your crane can. If not possible I suggest you need some proper access equipment to dismantle it in the air: scaffolding or a hydraulic access platform etc. if you can.
David Holden wrote:A gallon of water weighs 8.336 pounds.
Usual disclaimer for maths this time of night!
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