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Old 4th Jan 2011, 12:56 am   #41
Martin G7MRV
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Default Re: Transmission tower climb

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Originally Posted by russell_w_b View Post
Quote:
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'And don't forget that however rigid the tower appears I wouldn't mind betting it sways quite a bit in the wind...'
I'm told that the old 1,000 foot TV mast at Caldbeck (and those of a similar construction) will move over a radius of around six feet from vertical at the very top in a strong wind.

But there'd be no-one up there in those conditions, of course.
The more rigid it is, the more it has to flex!

I work at emley moor, thats 1200ft of concrete, and it sways up to 3 meters EACH WAY! at the top
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Old 4th Jan 2011, 9:19 am   #42
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Default Re: Transmission tower climb

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The more rigid it is, the more it has to flex!

I work at emley moor, thats 1200ft of concrete, and it sways up to 3 meters EACH WAY! at the top
Indeed. Our mast at Skelton (the tallest man-made structure in the UK) is fixed at the top by radials, and so cannot sway. It goes a sort of 'S'-shape instead!
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Old 4th Jan 2011, 10:45 am   #43
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Default Re: Transmission tower climb

Chairman of Interview Board: None of these candidates is what I am looking for. I want a man who can climb a transmitter tower in a gale! I want a hairy engineer!!

Young lady from Personnel Department:. I'll see if any of the other candidates meets that requirement.

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Old 4th Jan 2011, 12:04 pm   #44
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Default Re: Transmission tower climb

It's weird. I couldn't use a step-ladder as a teenager. At work I regularly climbed tall lattice masts and towers -and worked happily on the outside of the structures attached only by a thin pole belt. Wriggled up the old stand-by UHF TV antenna at the top of Emley once without any problem. Could comfortably (maybe not the right word) sit on the top of guyed poles on the top of tall buildings. But 1) I really don't enjoy descending sloping ladders, the last 20 feet of the Lichfield and Sutton Coldfield TV masts was always the worst bit, 2) bendy lightweight extending ladders are enjoyed even less, and 3) if I casually glanced over the side of a 2-storey building from the edge of a flat roof in the days before being attached was compulsory I would't do it a second time...!

And that, dear, is why the upstairs windows don't get cleaned very often

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Old 4th Jan 2011, 1:29 pm   #45
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Well, I'm not a company climber, so I'm not allowed up the towers, although I have been up Emley. I think I can appreciate that last 20ft of Lichfield, I've seen it, don't fancy climbing something help up by a ball bearing! (and a bent one at that). Its normal ladders for me as well, attached access ladders, scaffolds, towers, poles - no problem. Ordinary ladders - terrified!
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Old 4th Jan 2011, 4:16 pm   #46
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Default Re: Transmission tower climb

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'I've seen it, don't fancy climbing something help up by a ball bearing! '
So you wouldn't fancy nipping up to the anti-fading section of the likes of Dodford (long since gone), then?

Don't know if I would! I'd keep telling myself: 'it's not going to fall down; been up years... it's not going to fall down; been up years; it's not going...'
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Old 4th Jan 2011, 8:53 pm   #47
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I think the Designers should go up first, then again at regular intervals.
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Old 5th Jan 2011, 6:56 pm   #48
Martin G7MRV
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I think the Designers should go up first, then again at regular intervals.
Alan
isnt that the way the soviets did it with new aircraft? the designers were all passengers on the maiden flights!


anti-fading section? wow, that looks like one mean capacity hat! er, no, dont think i'd care to climb past that joint!
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Old 5th Jan 2011, 9:17 pm   #49
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Default Re: Transmission tower climb

I drive past Dodford regularly - shame that mast isnt there any more!

I fancy climbing the old Backbone mast at RAF Barkway (also fancy shunt feeding it for some serious 160m work!)
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Old 5th Jan 2011, 10:13 pm   #50
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Default Re: Transmission tower climb

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anti-fading section? wow, that looks like one mean capacity hat! er, no, dont think i'd care to climb past that joint!
Out of interest, Dodford mast was 732' tall including base and insulator (725' metalwork). The mast-break insulator between sections in my photo was about 470' from the ground, so the height of the top section would be around 262'. The triangular sides of the mast were 9' across.

The capacity-hat radial arms were 30' long and 10" diameter. They could be lowered in to the sides of the mast by means of halyards, if the extra capacity was not required. As it happened, the capacity hat increased the effective (electrical) height of the mast by 56'.

Sometimes it's difficult to scale these things from a photograph!
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Old 11th Jan 2011, 1:57 pm   #51
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Default Re: Transmission tower climb

Emly Moor. Is that the one that collapsed many years ago?
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Old 11th Jan 2011, 2:02 pm   #52
Martin G7MRV
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Emly Moor. Is that the one that collapsed many years ago?
No, we dont use that one, its all twisted


yes, same site. Very unlikely the current 1200ft of concrete wonder will ever fall down!
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