Shock Pole Collapse

at

This morning.

Clonskeagh, Dublin 14.

Cormac writes:

I wonder what contributed to this telecom pole blowing over last night? Leaving a near invisible phone line neck height across the footpath?

Any physics/maths person want to figure out the pushing force x4 AO pieces of rigid card added to the top of a not new, 30 foot high, 14″ wide, wooden pole?

Anyone?

14 thoughts on “Shock Pole Collapse

    1. Bort

      Yea the wood looks rotten enough but look at the next pole down, 8 posters, they’re not designed to endure that much horizontal pressure. Posters are essentially adding sails! The “no posters on road sign poles” has been largely ignored. There should be consideration on the additional strain to any structure the posters cause. Would you like if that had come down on your car or head? Not to mention the loose posters flying around to potentially decapitate someone all weekend.

      1. george

        No I wouldn’t. I would like the ESB to install their poles with a concrete base instead of putting them in soil.

        1. Paulus

          To be fair to the ESB; their pole in top pic seems to be set in concrete – or at least appears to have some treatment at base.
          It’s the P&T, Telecom, Eir…(or whatever they’re called this week), pole that has fallen.

  1. Hector Ramirez

    Esb advert on the radio asking not to place election posters on Electricity poles… saying it’s ‘strictly prohibited as it can cause injury to staff and the public’

    clearly no one is listening and the ESB isn’t doing anything about it, so why the issuing of warnings?

    1. Clampers Outside

      The ESB is doing something, they are asking people not to, as you said so yourself, in fairness like.

  2. Termagant

    Wind load is dynamic pressure times effective area, or alternatively 0.5 air density times windspeed squared times effective area
    Air density is usually around 1-1.2 kg/m3
    Dublin airport yesterday had gusts topping out at 56 km/h or 15.5 m/s
    The medium size for election posters offered by ElectionPrint.ie is 1220mm x 813mm, let’s call it a square metre. And there’s two of them.
    Which all works out at 288N applied across the area of the posters, which is at a minimum height of 2.3m because all poster-hangers follow regulations to the letter I’m sure, add on call it a metre to put us in the middle of the two posters
    Torque is force times distance so 950.4 Newton-metres at the base of the pole

    Does that clear things up?

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