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I need some help here, I have accquired a 100 ft three legged, free standing tower. The pivot /
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A 100" tower requires a fair lump on the bottom....Google "rohn towers" and you should easily find all the detail you are looking for.Miles
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Brian,The amount of concrete needed depends on how many son-in-laws you have?RegardsMatt
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Amateur Radio Operator??
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G"day Chopper I have done a lot of tower rigging with Various Mobile carriers and picked up bits of info here and there on tower build over the years. It sounds like you may have a southern cross tower. They typically had 150 Gal tube on the legs and X bracing. The welding may have been for a plan of strengthening as lately that has had to be done with all the extra equipment bolted on recently.Transmission upgrade is never ending and the loading is always an issue. The footings do go down a fair way, Ive heard 1/3 height and have to be perfectly level. Also build perpendicular check.A theodolite was used to check the build as they can turn during construction. They have large booker rod set in the concrete and lock nuts. La blonk was a known tower builder. I will have a chat to some mates in the industry to get more info. There may be council approval depending on where you are or if concerned. One thing you may need on a 100 Ft tower is a FAC light Typically red in color or may have to be painted red/white.I believe the option was lights or paint look at channel nine tower for example its a grey tower with lights but its 360 ft, you take a cut lunch for that climb. I had an option on a tower once but no where to put it. Good luck mate you"ll get some good performance with Tx/Rx. I"ll let you know what i find out.
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It" depend on Wots up top too.Anything that snags fast Moven air partials is go,n to load up the base a lot with that Leaverage.If it"s only an arial it"s not so bad, but if your plan,n on bungee jump,n.... .Also, all the mills I"v stood up, I"v put an "elifants foot" on the bottom of the concreat. ( flaired on the bottom) so it can"t pull out. Mazen how much power in air.I"v see mill legs with 7"x4" concreat uprooted.
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damn birdy your spelling is getting worse im sure of it.
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Thanks for all the info folks, looks like its a " Really big " project and is going to need a"specialist" in the footings department to get the thing right. Even 20 ft down into terra firma is beyond my abilty......well, past the bocats digging range.Was going to put a UHF aerial up the top.Not sure who made the tower but its made of heavy....well, looks to me.....pipe. Might have pulled on a project on thats a bit too big for me
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Hey Chopper I"m going fishing with a old mate rigger on Sunday and will dig for info. It"s a good project you"re working on so don"t let me put you off, it is do able. Generally the peer holes are done by cork screw hydraulic drill rigs. Filled with concrete and steel Rio.Depth unknown yet.The Galvanized Booker rod is set into concrete with possible L shape or nuts fitted to anchor into concrete. The tower foot will give an indication of the diameter of the rod. You can make a plywood template of the tower foot to set your anchor rods. I"ve seen these towers stand up to cyclones and haven"t moved an inch so they are very strong if the footings are right. You wont need support cables if your footings are good. If you place the tower on a hill you may find carriers interested in leasing the tower for repeater transmission equipment. Something to consider as fire, police, ambulance, mobile communications, UHF repeaters etc. are always looking for geographical advantage. A good way to make some pocket money if you go to the trouble in construction. A container spaced tin roof whirl y birds with solar power can house a lot of communications equipment. I will let you know when I get more info.Cheers mate.
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My lil tower is 10 meters with 12 bags of concrete with reo and 20 mm threaded rods and stays of 2mm stainless wire about 7 meters up. My furthest contact is over 18000 Kms away and that"s pretty normal.
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Yep
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Hey Chopper I"m going fishing with a old mate rigger on Sunday and will dig for info. It"s a good project you"re working on so don"t let me put you off, it is do able. Generally the peer holes are done by cork screw hydraulic drill rigs. Filled with concrete and steel Rio.Depth unknown yet.The Galvanized Booker rod is set into concrete with possible L shape or nuts fitted to anchor into concrete. The tower foot will give an indication of the diameter of the rod. You can make a plywood template of the tower foot to set your anchor rodsFeeling more put off now.......cork screw drilling machines are not plentiful in my area....I do know a couple of technicians
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Roughly: Assuming there are aerials at the top and in strong wind area the footings need to be 600mm dia 1.5 metre deepYou may have to check my calcs but it is about 0.5 m3 per hole
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Yeah i got that storm hear in Brisbane and had me out 23.45 hr shift fixing damage to mobile network.I will let you know when i find out more. The Southern Cross lattice tower is very strong and heavy once erected some strength is by it"s weight too. If it started moving gy wires will have to be strong to hold it they are generally for spangle masts not lattice towers.The potential wind loading at 100 ft can be enormous antennas will not make much difference, yes will add to loading but the tower will load quite significantly in windy conditions. You can hear them roaring from the ground and not much fun working on them too as you get completely wind
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