Octagonal Airport Security Flood Lights

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I'm beginning this project of Welding 8pcs of Octagonal Airport Security Flood Lights Columns  height 25m made of octagonal hot galvanised steel (to ISO EN 1461:2009) complete with brackets flood lighting in one direction. Complete control gear and protection equipment.My scope is to construct the pylon only. The challenge is in having this Octagonal piece with a base of about 1m (suggested by the client) and gradually becoming small at the top (I'm thinking of something like 2ft). I'm thinking of making sections of about 8ft, which I will join to make the 25m. I need suggestion here please. I'm also thinking of having access ladders inside up to an area where a person cant fit inside, then I will put another access door and continue with the access ladders outside. Urgent suggestions please, has any one ever done this before?
Reply:do you have any pictures?  are you using prefabricated shape steel poles like this Tiger Sales:  AHP Distributor    www.tigersalesco.comAHP200x; AHP 160ST; MM350P,  Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma.  For Sale:  Cobra Mig 250 w/ Push-pull gun.  Lincoln Wirematic 250
Reply:I think he is building the "poles"Trailblazer 302Hobart Stickmate AC/DCLincoln SP 135 TSmith torchSpoolmatic 30A
Reply:Thanks guys, I'm having very poor pictures, the one above is the exact one I'm trying to do. True, I'm welding the pole like the one in the picture above. Any more info please?
Reply:25 meters = 82 ft 0-1/4in. This is a rather tall pole and will weigh somewhere upwards of 11,000 lbs.Do you have the facilities to handle this?  Do you have the necessary engineering prowess? You may be better off buying what you require.  Check this site:  Lonestar Prestress Manufacturing- MondoMember, AWSLincoln ProMIG 140Lincoln AC TombstoneCraftsman Lathe 12 x 24 c1935Atlas MFC Horizontal MillCraftsman Commercial Lathe 12 x 36 c1970- - - I'll just keep on keepin' on.
Reply:Lonestar has concrete products only. I'm thinking I can handle it.
Reply:Originally Posted by LutadamLonestar has concrete products only. I'm thinking I can handle it.
Reply:Originally Posted by MondoMy mistake,  I should have realized that "prestressed" would be related to concrete.  I could not tell the material from their photos.- Mondo
Reply:I think this is one of those things where you just need to hire a professional engineer to put your vision on paper.
Reply:We have some of those on a highway north of me (alot higher than 25m though).  I think they have a better method of servicing the lights than what you described.  The lights are on a separate piece that is lowered down the pole to ground level for service.  They have a locking access panel at the bottom of each post in order to access the lowering and raising mechanism.Just my 2c on what I've seen.  I think that would be alot more sensible as a servicing method, it should also reduce servicing cost for the client as they don't have to have someone climb the pole.--Wintermute"No man's knowledge here can go beyond his experience." - John Lockewww.improvised-engineering.comManufacturer Agnostic:Blood----------Sweat---------Tears----|------------------|----------------|----Lincoln Red, Miller Blue, Esab Yellow
Reply:Originally Posted by wintermuteWe have some of those on a highway north of me (alot higher than 25m though).  I think they have a better method of servicing the lights than what you described.  The lights are on a separate piece that is lowered down the pole to ground level for service.  They have a locking access panel at the bottom of each post in order to access the lowering and raising mechanism.Just my 2c on what I've seen.  I think that would be alot more sensible as a servicing method, it should also reduce servicing cost for the client as they don't have to have someone climb the pole.--Wintermute
Reply:Is it possible to get any pictures @ Wintermute?
Reply:Look here:http://www.rohnnet.com/steel-poles-support-structures
Reply:They OP is in Uganda so buying the premade pieces may not be an option for him.  I am curious as to why it needs to be such a big diameter if its only holding light poles.  though you could use a thinner diameter steel on a large diameter structure.  what process will u use to weld it and how do you post treat the galvanizing after welding it?Last edited by soutthpaw; 01-10-2013 at 04:58 PM.Tiger Sales:  AHP Distributor    www.tigersalesco.comAHP200x; AHP 160ST; MM350P,  Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma.  For Sale:  Cobra Mig 250 w/ Push-pull gun.  Lincoln Wirematic 250
Reply:Originally Posted by LutadamIs it possible to get any pictures @ Wintermute?
Reply:Originally Posted by wintermuteI'll see if I can find some...it's a bit of a drive for me, but I could always head up there this weekend and take some pictures from off the side of the highway for you.--Wintermute
Reply:Originally Posted by soutthpawThey OP is in Uganda so buying the premade pieces may not be an option for him.  I am curious as to why it needs to be such a big diameter if its only holding light poles.  though you could use a thinner diameter steel on a large diameter structure.  what process will u use to weld it and how do you post treat the galvanizing after welding it?
Reply:One this webpage there are two pictures showing how the lights are serviced (I guess this is a standard thing on what they call High Mast Lighting...took me a while to find the right search term to find them).http://blog.udot.utah.gov/2012/03/high-mast-update/Looks liked there's basically a pulley system in the bottom of the pole that allows the lighting assembly to be lowered down the pole for service and then raised back up.  I could see that this may also be useful if you wanted to change the height at which the lights are suspended so that you have more or less light spread.Hope that helps you some.--Wintermute"No man's knowledge here can go beyond his experience." - John Lockewww.improvised-engineering.comManufacturer Agnostic:Blood----------Sweat---------Tears----|------------------|----------------|----Lincoln Red, Miller Blue, Esab Yellow
Reply:Originally Posted by wintermuteOne this webpage there are two pictures showing how the lights are serviced (I guess this is a standard thing on what they call High Mast Lighting...took me a while to find the right search term to find them).http://blog.udot.utah.gov/2012/03/high-mast-update/Looks liked there's basically a pulley system in the bottom of the pole that allows the lighting assembly to be lowered down the pole for service and then raised back up.  I could see that this may also be useful if you wanted to change the height at which the lights are suspended so that you have more or less light spread.Hope that helps you some.--Wintermute
Reply:Originally Posted by androcathrI'm welding the pole like the one in the picture above.
Reply:Originally Posted by soutthpawThey OP is in Uganda
Reply:Originally Posted by forhireUnderstood. The reason I linked the Rohn site was because it has the basic dimensions and weights of the engineered poles, including top and bottom diameters and number of sections. With that information it would be fairly easy to estimate the material thickness based on the weight... provided all the sections are the same thickness.